coal mill - an overview | sciencedirect topics

coal mill - an overview | sciencedirect topics

To control the quality of coal being sent to the burners located on the furnace walls. The word quality here means the temperature and fineness of the PF. The set temperature values are dependent on the percentage of volatile matter that exists in the main fuel. The controlled temperature is important for many reasons such as stability of ignition, better grindability of solid fuels, better floating ability of suspended PF particles, etc. However, a temperature more than 65 to 70 is not recommended for various reasons.

Operating data from a coal mill is used to compare the fault detection observer-based method and PCA/PLS models based approach. There are 13 process measurements available representing different temperature, mass flows, pressures, speed etc in the coal mill.

The measurement is not updated, if the variation is less than 1%. The variations of T(t) is in the major part of the operational time inside this interval. Therefore, it is not suitable to be chosen as the predictor variable. However, the variations can be extracted from the TPA(t), which is used to control the temperature of the mill. Therefore, the PLS model is developed with the temperature of the mill as the dependent variable. In addition 6 of the other variables are chosen as regressors since there is barely information in the remainder.

A static PCA model is first developed, which captures around 99% of variations with 5 PCs (see Fig.5), which indicates strong collinearity among regressors. As shown in Fig.6, both Q and T2 statistics (with 95% confidence level) of the static PCA model are noisy, which potentially lead to false alarms. A static PLS model with 2 LVs achieves the minimal PRESS (see Fig.7), which is applied to the test dataset. Fig.8 shows the comparison between process measurement and the static PLS model prediction, together with the 95% confidence level. The process gradually drifts away form the NOC model, which eventually moves beyond the threshold around the sample 150. Due to the noise involved in the prediction signal, the estimation moves in and out the threshold from 110 till 200, when it is clearly out of the confidence level. Both Figs.6 and 8 reveal that static PCA and PLS models may lead to false alarms due to the noisy estimation. In addition, process measurements are commonly auto-correlated, this behavior is expected since the coal mill runs dynamical. Thus, dynamic models are developed by including time lagged process measurements, to address the issue of auto-correlations and reduce the possibility of false alarms due the none modeled dynamics.

Including time lagged terms enhance the NOC model by including historical data. However, time lagged terms also introduce additional noise into the modeling data block. For example, including n+1 time lagged terms might lead to poorer validation performance than the model with n terms due to measurement noise. Therefore, PRESS is used to choose an appropriate number of time lagged terms for a dynamic PLS model.

The predictive ability of the PLS model is improved with the inclusion of time lagged terms. The PRESS decreases from 1.645 to the minimal value of 1.142, which is obtained with a dynamic PLS of 3 LVs using 8 time lagged terms. The application of the dynamic PLS model to the test data reveals that the fault occurs in the process around sample 160. Fig.9 also shows a much smoother prediction such that the possibility of false alarms is significantly reduced. A dynamic PCA model is developed by the inclusion of 8 time lagged terms. The number of PCs is chosen as 2 through cross-validation, which explains 70.6% of process variations. The Q statistic of the dynamic PCA model is shown in Fig.10, the fault is detected around 160 samples, which is consistent with the dynamic PLS model.

The control loop for mill outlet temperature discussed here is mainly for TT boilers based on a CE design with bowl mill (refer to FigureVIII/5.1-2). A similar loop is valid for a ball-and-tube mill, which is discussed separately in the next section. In order to understand the loop in the figure, it is advisable to look at FigureVIII/5.0-1 and the associated PID figure (refer to FigureIII/9.2-4).

The outlet temperature of the coal mill is maintained at desired point so that the coal delivered from the mill is completely dry and achieves the desired temperature. Also, in case of high temperature at the mill outlet, cold air is blown in to reduce the risk of fire.

Normally, the entire requirement of PA flow necessary for a particular load at the mill is initially attempted through HAD so as to ensure complete drying of the coal (especially during rainy seasons) and to raise the mill temperature at a desired point. However, there may be times during hot dry summers when the mill outlet temperature shoots up. This is also never a desired situation because of fire hazard. In fact, to combat this fire hazard, arrangements for mill-inerting systems with inert gases (e.g.,N2 and CO2) need to be made (another purpose is to reduce air supply).

This is more important for ball-and-tube mills, especially when these are operated with one side only. Therefore, CAD comes into operation whenever there is need to bring down the mill temperature. Naturally when this damper operates (i.e., starts opening through process feedback), the hot air damper closes. Here also is a cross-operation of the two dampers but through process and not directly via the loop, so control loop disturbances are fewer than in the old days when cross-operations were implemented in the loop.

Mill outlet temperatures measured by redundant temperature elements and transmitters are put in an error generator. (Temperature element specialties were discussed earlier and so not repeated here.) The output of the error generator drives a PID controller. In general, since temperature is a sluggish parameter it is always advisable to use PID controllers for better results. To prevent controller saturation, controllers are put into service only when both the loops are in auto. The output of the controller through I/P converters normally drives pneumatic actuators meant for CAD.

As stated earlier, only when both HAD and CAD are in auto is the controller put into operation. Since FSSS operations depend on mill temperature conditions, with the help of the limit value monitor (LVM) necessary contacts statuses are shared with FSSS. The loop can be released to auto by an FSSS command. As a protection, both the full opening command and the >x% command for the mill CAD are issued from FSSS so sufficient cold air is circulated. If the auto release command from FSSS is missing or if HAD is in manual, it is necessary to inhibit auto operation so that the operator pay complete attention to the mill outlet temperature. That is the check back signal for FSSS from the loop for damper position.

How breakage energy and force are applied in the mill in order to achieve size reduction in an efficient and effective manner. This is a matter of design and performance of mills and the main subject of this section;

How the material being reduced in size behaves in terms of breakage characteristics such as strength and resulting broken size and shape. This relates to how the material responds to the application of breakage energy and force in terms of rate and orientation of application.

The analysis of individual mill design and operation is complex; so, for simplicity we will consider a typical mill layout for one mill type only. As VSMs have come to represent the bulk of the power station mill fleet, the explanation of mill operations will be based on this mill type. Figure13.2 illustrates the typical key components of a VSM.

In coal milling for power stations, a closed-loop process is used in which the rejects from the classifier are returned to the mill for regrinding. In VSMs, the re-circulation loop is within the mill, but some mill types would have an external loop. In fact, there are a number of re-circulation loops within a mill system. The situation is further complicated by the mill reject streams that reject undesirable material (tramp metal and non-coal bearing rock) from the mill. Generally, the following steps illustrate the path through a VSM:

Air entering through the Port Ring creates a fluidising zone in which heavy material (Mill Rejects) such as rock falls through the Port Ring into the Air Plenum below the Grinding Table and is ejected from the Mill through the Mill Reject System;

From the fluidising zone the ground coal is lifted up inside the Mill Body. Larger particles of coal reach a terminal velocity at which gravity will pull them back on to the Grinding Table for regrinding (Elutriation);

The fineness of the milling product and the capacity of the pulverizer are strictly connected. With increased fineness grows the overall circulation rate of coal in the mill, coal retention time and the flow resistance. As a result, the maximum mill capacity decreases and the rate of change of operational parameters of the furnace system deteriorates. In extreme cases, the performance of the boiler may be limited, and therefore improving the fineness of milling product must often include the modernization of the grinding system. The increase of the throughput of a pulverizer, which compensates the loss of capacity resulting from the increased fineness of coal dust, may be achieved through:

The analysis [45] proves that the maximum capacity of the ball-ring mill is obtained using 5 or 6 balls. Because earlier, as a rule, a greater number of balls was used, there is a possibility to increase the capacity by replacing the existing balls through a lower number of bigger balls. For example, in the EM-70 of FPM SA 9 balls of the diameter 530mm were replaced with 7 of 650mm. Such a modernized milling system can usually be set up on the existing gearbox. It should be noted that the costs associated with replacement of the classifier and the grinding elements are only slightly greater than the costs of the major repair of the mill. In the case where an existing mill has a grinding unit of the number of balls close to 6, the only way to increase performance is to increase the diameter of the balls, but this requires replacement of the mill body.

It has to be mentioned that the number of balls is increased during the mill operation. For example, the initial ten balls, after lowering the diameter below some value (due to wear), is complemented with the 11th additional ball.

If the existing pulverizer is equipped with 6 or 7 balls, increasing of its capacity is also possible by means of replacing the ball-ring system with the bowl and roller milling device. The milling costs per Mg of fuel in both systems are similar. However, with the same dimensions of the milling systems, the capacity of the roller system is about 15%20% higher. Another advantage is the shorter renovation time, which is about 714days for the ring-ball system, while for the roller mill, only 37days. In addition, hardfacing and re-profiling of grinding components are much easier for roller milling systems.

During the modernization of milling plant with compression mills, detailed analysis requires the selection of cross sections of nozzle-rings at the inlet of the drying agent to the mill, in order to minimize the amount of coal removed from the grinding chamber. The preferred solution is a rotating nozzle ring integrated with the bowl. This ring equalizes air distribution pattern at the periphery of the grinding chamber, which allows increasing the capacity of the grinding system without fear of excessive loss of fuel from the mill.

The rotational speed of the vertical spindle mill affects the operating conditions of the grinding unit. At high rotational speeds, the grinding unit operates at high flow of the material in the radial direction and low layers of the material under the grinding elements (balls, rollers). This causes the particles to be discharged without comminution and increases circulation in the mill. At the same time, the flow resistance and milling energy consumption (including erosive and abrasive wear) of the mill will increase.

If the rotational speed is too low, the material flow will decrease significantly. The thickness of the material layer under grinding elements will exceed the maximal height for which the particles are drawn under the grinding elements, causing excessive buildup of the material in front of the grinding elements. The material outflow from the bowl (or the bottom ring) is not supported by grinding elements movement, which results in higher flow resistance and uneven loading of the nozzle ring. These factors cause a significant decrease in mill efficiency.

Tests carried out for some industrial mills have proven that the change of grinding unit rotational speed strongly influences mill capacity. Therefore, by changing the gear ratio of the mill, both milling capacity and dynamic properties of the mill can be improved.

The fuel injector is designed to introduce the dispersed coal particles in a medium of air into the furnace. The mass ratio of air to coal is dependent on the coal mill manufacturer and usually ranges from 1.75 to 2.2 with a typical value of 2.0. An air to fuel mass ratio of 1.8 produces a primary stoichiometric ratio of approximately 0.16, or 16% of the air necessary for complete combustion of the coal. According to the previous discussion of NOx formation chemistry it is expected that lower NOx concentrations are achievable with lower primary gas/fuel ratios. The diameter of the coal transport line is constrained by the minimum velocity at which coal particles remain entrained in the carrier gas, or the coal layout velocity. This velocity is generally accepted to be 50 ft/s (Wall, 1987). The dimension of the fuel injector itself is selected by the burner manufacturer to provide the desired gas and particle velocity at the exit of the burner. The velocity here is anywhere from 50 to 115 ft/s and is chosen to provide the desired near flame aerodynamics impacting the mixing between the primary and secondary air. In many applications, there is an elbow, scroll or turning head in the coal pipe at the burner inlet. Such inlet devices result in roping, or an uneven distribution of coal within the fuel injector. Many manufacturers use components to redistribute the coal particles with an even density around the circumference of the fuel injector at its exit. A uniform distribution is typically desired to minimize NOx while maximizing combustion efficiency. The material of the fuel injector is chosen to be reliable under high temperatures and erosive conditions and is often a high grade of stainless steel. Another component of the fuel injector that is found on many commercial low NOx burners is a flame stabilizer. The function of this feature is to provide a stagnation zone at the fuel injector exit on the boundary between the primary and secondary air where small-scale mixing of coal and air occurs, providing ideal conditions for ignition and flame attachment.

Sulfur in coal can affect power plant performance in several ways. Sulfur in the form of pyrite (FeS2) can lead to spontaneous combustion and contributes to the abrasion in coal mills; therefore, if a lower quality coal containing pyrite is used in place of the design coal it can lead to problems. As the overall sulfur concentration increases, so do the emissions of sulfur dioxide (SO2) and sulfur trioxide (SO3). While the majority of the sulfur is converted to SO2 (about 12% of the sulfur converts to SO3), the increase in SO3 emissions increases the flue gas dew point temperature, which in turn can lead to corrosion issues. Most countries have legislation restricting SO2 emissions and utilizing higher sulfur coals will require additional SO2 controls (Miller, 2010). In some cases, the use of low quality fuels may impair the desulfurization equipment because of a greater quantity of flue gas to be treated (Carpenter, 1998).

All power stations require at least one CW pump and one 50% electric boiler feed pump available and running to start up a unit. In addition, fossil plant requires either coal mills or oil pumps and draught plant, e.g., FD and ID fans, PA fans, etc. Gas-cooled nuclear plant requires gas circulators running on main motors or pony motors at approximately 15% speed, whereas water reactors require reactor coolant pumps. Both nuclear types require various supporting auxiliaries to be available during the run-up stages, the poor quality steam being dumped until the correct quality is achieved.

When steam of correct quality is being produced, the turbine-generator will be run up to speed with all the unit supporting auxiliaries being powered from the station transformers via the unit/station interconnectors.

The Amer 9 plant utilizes both direct and indirect co-firing configurations. The plant co-fires biomass pellets up to a maximum of 1200ktyr1, generating 27% by heat through two modified coal mills. Only wood-based fuel has been used since 2006, due to reduced subsidies for agricultural by-products.

For the indirect co-firing option, low-quality demolition wood is gasified in a CFB gasifier at atmospheric pressure and a temperature of approximately 850C. The raw fuel gas is cleaned extensively and combusted in a coal boiler via specially designed low-CV gas burners. An advantage of this concept is that there is no contamination of the fuel gas as it enters the coal-fired boiler. This allows a wide range of fuels to be co-fired within existing emission constraints while avoiding problems with ash quality. The challenge, as always, is working within the relatively stringent fuel constraints while avoiding the inevitable high investment costs [22]. Amer 8 also co-fires at high biomass feed levels but uses a standard hammer mill configuration.

Coastal power stations, due to their proximity to major urban areas, tend to be better managed in terms of production consistency and environmental standards. In China and India in particular, coastal power stations tend to mill coal more finely, use superior emissions to control technologies, and have a tendency to use higher-quality coal blends. The result is higher quality and greater consistency in fly ash chemical and physical properties, to the extent that the material is more desirable to local cement manufacturers and those in other domestic markets along the coast. This material is typically allocated in multiyear contracts.

Adding to this, coastal urban areas usually have high volume demand for construction materials. Coastal power stations are often fully contracted to supply cement-grade fly ash, as well as the run of station ash and bottom ash to serve this demand. This is particularly clear in China, where coastal cities such as Shanghai and Shenzhen have seen dramatic urban development over the last 20years. During this period, both cities have been net importers of fly ash, drawing from both inland and domestic coastal sources.

The cost of loading material onto vessels, whether in containers or bulk, is much lower at coastal power stations due to lower local land transport costs. As a result, coastal power stations have been logical first choices for exporters/importers, and many have already developed either domestic coastal markets for their ash or export markets.

pulverized coal production project-sbm industrial technology group

pulverized coal production project-sbm industrial technology group

Material: coal Capacity: 1,000,000TPY Output Size: 200mesh D80 Application: Fuel of industrial boilers Annual Revenues: RMB 100 million Equipment: 4 MTW215 Mills (phase-II) and other auxiliary facilities

Project Overview Project Background According to a report of the China Coal Industry Association, the industry situation is really severe, with nearly 70% coal enterprises suffering a loss, and the transformation of the coal industry is extremely urgent. Therefore, on the precondition of controlling the total coal consumption volume, how to improve the economic benefits of traditional coal enterprises, how to utilize the coal resource efficiently and cleanly, and how to reduce the coal pollution to the environment have become the studying issues of numerous enterprises. Severe Situation of Coal Enterprises Recently, a report released by the China Coal Industry Association revealed that nearly 70% coal enterprises suffered a loss and were under difficult operation and the industry situation was extremely urgent. Meanwhile, the central government is actively boosting the marketization reform and structural adjustment of the coal industry from the policy level. Therefore, on the precondition of clearing the supply-demand relationship, the transformation of coal industry is extremely urgent. Support from National Policy The Action Plan of Clean and Efficient Coal Utilization (2015~2020) recently released by the China National Energy Administration clarified the key tasks in 7 aspects. Of them, one is that by 2020 the use of high-efficiency boilers in some regions must account for over 50 percentages. The 5th Plenary Session of 18th National Congress of CPC brought forward the boosting of clean and efficient utilization of fossil energies, including coal. It can be learnt that the high-efficiency and environmental-friendly pulverized coal boiler is a key energy-saving technology project promoted by the central government. Support from Local Government Boosting the transformation with financial policy, Shandong government provided subsidies for key PPP projects at the earlier stage. In addition, Shandong government issued the notification for the High-Efficiency and Environmental-Friendly Pulverized Coal Boiler Promotion Action Plan (2016~2018) to mainly apply the high-efficiency and environmental-friendly pulverized coal boilers in the gas and heat supply fields, to implement the "Five-One Project" properly, and to speed up the promotion and application of high-efficiency and environmental-friendly pulverized coal boilers. Environmental Pressure TheThe traditional industrial boilers are fueled by block coals so that the emissions of soot and pollution gases are high. If fueled by pulverized coal, the boiler can realize the emissions of soot(30mg/m3), sulfur dioxide(100mg/m3), and nitric oxide(200mg/m3), which are lower than the national emission regulations and meet the local stringent environmental requirement. Economic and Environmental Benefits of Pulverized Coal Combustion When a traditional coal-fired boiler is reformed to be a pulverized coal boiler, the burn-off efficiency of pulverized coal is higher than 98%, the boiler's operating thermal efficiency higher than 90%. The fuel-saving capacity is higher than a traditional boiler by 30%, and the comprehensive operation cost reduces by 20~30%. The fuel procurement cost for the unit heat value of a pulverized coal boiler is only approximately 1/3 of that for a natural gas boiler. Performance Standard Design Scheme Customer address: Shandong Material: Coal Output Size: 200mesh D80 Capacity: 1,000,000TPY (Phase-II) Equipment: Four MTW215 European Grinders (phase-II) and supporting feeding, pulverized coal production, dust extraction, pulverized coal collection, conveyance, storage, and nitrogen protection devices. Configuration of Production Line Equipment Main Equipment 4 MTW European Mills (Phase-II) The MTW series European Mill is a new generation of grinding machines. This machine adopts multiple advanced technologies, including integral bevel gear drive, internal thin oil lubrication system, and online measurement of oil temperature, and boasts multiple proprietary patented technological property rights, characterized by small occupational area, low investment cost, low operating cost, high efficiency, and environmental protection. System composition: RaRaw material bin, enclosed constant weight feeder (optional), MTW European Grinder, pulverized coal collector (explosive-proof precipitator for coal grinder), fan, de-ironing separator, drying system, and conveyance system. Auxiliary Equipment Nitrogen Generator System Fire Extinguishing System Pneumatic Conveyance System Intelligent Central Control System Nitrogen Generator System The air is compressed by the compressor and, after a majority of oil, water, and dust is removed by the high-efficiency de-oiler, a mass of water content is removed by the refrigeration type compressed air drier, and the dust is removed by the dust fine filter. Then the air is buffered by the air reservoir and enters into the pressure swing adsorption oxygen-nitrogen separation system (namely nitrogen preparation unit) filled with absorbent. The clean compressed air is fed from the bottom of absorption tower and, after being diffused by the air diffuser, the air is input evenly into the absorption tower. After the oxygen-nitrogen absorption separation, the nitrogen is output from the outlet and enters into the nitrogen stabilizing tank. Fire Extinguishing System When the temperature within the protection zone exceeds the pre-set alarm temperature value, the alarm signal is transmitted to the alarm unit which sends a command to the alarm bell to start alarming. The CO concentration alarm signal is also connected to the fire alarm unit via signal wire. When the CO concentration exceeds the pre-set value, the alarm unit sends a command to the sound-light alarm to start alarming. Then, the alarm unit starts the 30s' countdown. When the countdown is completed, the alarm unit sends a signal to the CO2 fire extinguishing system so that the nitrogen starting cylinder battery opens the corresponding solenoid valve and the nitrogen starts the CO2 fire extinguishing system to extinguish the fire for the alarm zone. The system has four control modes, automatic, manual, mechanically emergency manual, and emergency start/stop mode respectively. Pneumatic Conveyance System The pneumatic conveyance system mainly functions as conveying the pulverized coal into the finished product tank and long-distance conveyance is available. Intelligent Central Control System With the industrial computer as the core unit of the entire system, the central control system reads the PLC or ECS by multiple communication technologies to collect the conditions of the site equipment and, based on the conditions of site equipment, computer sends commands to control the site equipment to realize the functions, including remote control of equipment, record analysis of equipment information, and printed operation report. The MTW European Mill has the intelligent control system developed and designed especially as the pulverized coal mill and adopts the ESC intelligent control system to realize the centralized control and the remote monitoring function---observing the running conditions of production line via mobile terminal equipment such as mobile phone and iPad, can also be realized. Process Analysis The raw coal in the bin is fed by belt feeder into the scraper conveyor constantly and evenly by which the raw coal is then sent into the dryer for baking. After baking, the raw coal is conveyed by the enclosed scraper conveyor to the enclosed storage bin. Transferred by truck to the raw material bin of pulverization system, the raw coal then is fed by belt conveyor into the MTW215 European Mill. The pulverized coal, graded by the pulverized coal separator, is supplied along the pipeline into the pulverized coal collector (The residual gas is collected by pulse dust collector). The finished pulverized coal collected is fed by screw conveyance system into the pulverized coal elevator to finished product bin for storage. The pulverized coal is transported by the tanker truck depending on the actual needs. The entire system is equipped with nitrogen generator system and CO2 system for explosion-proof and fire-extinguishing protections and its critical parts are installed with explosion-proof valve to guard equipment against damage. Project Advantages Project General Contracting Service To minimize the project construction period and reduce the customer's investment, this pulverized coal preparation project adopts the EPC service. It is a turnkey service designed by SBM to bring convenience to our customers. This service runs through all projects steps, including site terrain & environment survey and investigation, production line process design, raw material inspection and testing, finished product analysis, investment budget analysis, and equipment installation and commissioning, which can prevent downtime and delay of production caused by inadequate preparation of construction materials and labor shortage. The EPC service realized the maximum production convenience for the customer, met the customer's need of urgent production schedule, and won the high appraisal from the Shandong customer. Operation Convenience To promote the operation convenience of pulverized coal production line, this production line adopts the unique two-step (baking and pulverizing) operation method. The two-step pulverized coal preparation system is a solution with baking and pulverizing separated. With relatively low temperature inner the grinding chamber, it's the unique pulverized coal production process of MTW European Mill. This process system features simple and easy control and can remarkably improve the safety performance of the production line. 1. Raw coal bin 2. Dryer 3. Weighing coal feeder 4. MTW European Grinder 5. Pulse dust collector 6. Pulverized coal collector 7. Fan 8. Finished coal bin 9. Pulverized coal bin 10. Monitoring system 11. Explosion-proof system 12. Central control system Low Investment The MTW series European Mill adopts multiple advanced technologies, including integral bevel gear drive, internal thin oil lubrication system, and online measurement of oil temperature, and boasts multiple proprietary patented technological property rights, characterized by small occupational area, low comprehensive investment, low operating cost, high efficiency, and environmental protection. Safe and Environment-Friendly To be fire-proof and explosion-proof during the pulverized coal production, the production line is equipped with nitrogen system, CO, and CO2 fire extinguishing system to guarantee running safety and stability of equipment to the maximum extent. Meanwhile, the effective measures are taken to strictly control the dust concentration of exhaust gas within the national specified range. The production line adopts the pulse dust collector manufactured with advanced technologies to reduce the influence on the surrounding environment to the maximum extent. EPC Service two-step (baking and pulverizing) method Pulse dust collector Benefit Evaluation Economic Benefit A coal-fired boiler reformed by pulverized coal atomization technology can promote the combustion efficiency to 98%, the thermal efficiency to >90%, and steam output per ton from 5.5T to >9T. Compared with a traditional coal-fired boiler, it can save coal by >30%, electricity by 20%, water by 10%, land by 60%, and manpower by 50%. The pulverized coal produced realized RMB 800 million of sales volume and RMB 100 million of profit and tax. Social Benefit After atomization, the pulverized coal produced by this production line is supplied to the industrial boiler for combustion, which breaks the traditional combustion method by block coal. The efficient and clean use of coal boosts the transformation and upgrading of coal industry. It's of enlightening significance for the coal enterprise to successfully live through this severe situation. Environmental Benefit Emission of all atmospheric pollutants is equal to the emission standard of the natural gas boiler---no dust, coal slag, and smoke. Customer Feedback Due to large scale of this pulverized coal production line and strict quality requirement on pulverized coal, through extremely careful selection of manufacturers and the long-time multi-aspects investigation, we finally selected the equipment manufactured by SBM. From the site investigation to the installation and commissioning, we received professional solutions and services and four coal pulverization mills (Phase-II) are running well, with the production capacity exceeding the design capacity. On-site photos Extended Reading Pulverized Coal Atomization Technology The core of this technology is the "pulverized coal configuration and multiple vortex atomization", namely the high-speed air vortex is mixed with grained coal of 200 mesh into the vortex atomizer so that the pulverized coal and the air are sufficiently mixed and atomized to form a vortex and are fed into the boiler for floating combustion to realize high-efficiency combustion via thermodynamic system, measurement and control system, and exhaust gas purification system, with the emission meeting the emission standard of natural gas. The pulverized coal used in the high-efficiency pulverized coal boiler system is selected, dried, and ground to be pulverized coal of 200 mesh for centralized management and distribution, which can effectively guarantee the quality stability of pulverized coal and eliminate the scattered coal piles and reduce the surrounding pollution, featuring high efficiency and energy conservation, clean emission, high automation level, environmental-friendliness, and outstanding economic, environmental, and energy conservancy benefits. The vigorous development, promotion and application of high-efficiency and environmental-friendly pulverized coal boilers is of important significance to boost the clean and efficient coal utilization, improve the atmospheric environment, and develop the energy conservation and environment protection industry.

According to a report of the China Coal Industry Association, the industry situation is really severe, with nearly 70% coal enterprises suffering a loss, and the transformation of the coal industry is extremely urgent. Therefore, on the precondition of controlling the total coal consumption volume, how to improve the economic benefits of traditional coal enterprises, how to utilize the coal resource efficiently and cleanly, and how to reduce the coal pollution to the environment have become the studying issues of numerous enterprises.

The MTW series European Mill is a new generation of grinding machines. This machine adopts multiple advanced technologies, including integral bevel gear drive, internal thin oil lubrication system, and online measurement of oil temperature, and boasts multiple proprietary patented technological property rights, characterized by small occupational area, low investment cost, low operating cost, high efficiency, and environmental protection.

RaRaw material bin, enclosed constant weight feeder (optional), MTW European Grinder, pulverized coal collector (explosive-proof precipitator for coal grinder), fan, de-ironing separator, drying system, and conveyance system.

The air is compressed by the compressor and, after a majority of oil, water, and dust is removed by the high-efficiency de-oiler, a mass of water content is removed by the refrigeration type compressed air drier, and the dust is removed by the dust fine filter. Then the air is buffered by the air reservoir and enters into the pressure swing adsorption oxygen-nitrogen separation system (namely nitrogen preparation unit) filled with absorbent. The clean compressed air is fed from the bottom of absorption tower and, after being diffused by the air diffuser, the air is input evenly into the absorption tower. After the oxygen-nitrogen absorption separation, the nitrogen is output from the outlet and enters into the nitrogen stabilizing tank.

When the temperature within the protection zone exceeds the pre-set alarm temperature value, the alarm signal is transmitted to the alarm unit which sends a command to the alarm bell to start alarming. The CO concentration alarm signal is also connected to the fire alarm unit via signal wire. When the CO concentration exceeds the pre-set value, the alarm unit sends a command to the sound-light alarm to start alarming. Then, the alarm unit starts the 30s' countdown. When the countdown is completed, the alarm unit sends a signal to the CO2 fire extinguishing system so that the nitrogen starting cylinder battery opens the corresponding solenoid valve and the nitrogen starts the CO2 fire extinguishing system to extinguish the fire for the alarm zone. The system has four control modes, automatic, manual, mechanically emergency manual, and emergency start/stop mode respectively.

With the industrial computer as the core unit of the entire system, the central control system reads the PLC or ECS by multiple communication technologies to collect the conditions of the site equipment and, based on the conditions of site equipment, computer sends commands to control the site equipment to realize the functions, including remote control of equipment, record analysis of equipment information, and printed operation report.

The MTW European Mill has the intelligent control system developed and designed especially as the pulverized coal mill and adopts the ESC intelligent control system to realize the centralized control and the remote monitoring function---observing the running conditions of production line via mobile terminal equipment such as mobile phone and iPad, can also be realized.

The raw coal in the bin is fed by belt feeder into the scraper conveyor constantly and evenly by which the raw coal is then sent into the dryer for baking. After baking, the raw coal is conveyed by the enclosed scraper conveyor to the enclosed storage bin. Transferred by truck to the raw material bin of pulverization system, the raw coal then is fed by belt conveyor into the MTW215 European Mill. The pulverized coal, graded by the pulverized coal separator, is supplied along the pipeline into the pulverized coal collector (The residual gas is collected by pulse dust collector). The finished pulverized coal collected is fed by screw conveyance system into the pulverized coal elevator to finished product bin for storage. The pulverized coal is transported by the tanker truck depending on the actual needs. The entire system is equipped with nitrogen generator system and CO2 system for explosion-proof and fire-extinguishing protections and its critical parts are installed with explosion-proof valve to guard equipment against damage.

To minimize the project construction period and reduce the customer's investment, this pulverized coal preparation project adopts the EPC service. It is a turnkey service designed by SBM to bring convenience to our customers. This service runs through all projects steps, including site terrain & environment survey and investigation, production line process design, raw material inspection and testing, finished product analysis, investment budget analysis, and equipment installation and commissioning, which can prevent downtime and delay of production caused by inadequate preparation of construction materials and labor shortage. The EPC service realized the maximum production convenience for the customer, met the customer's need of urgent production schedule, and won the high appraisal from the Shandong customer.

To promote the operation convenience of pulverized coal production line, this production line adopts the unique two-step (baking and pulverizing) operation method. The two-step pulverized coal preparation system is a solution with baking and pulverizing separated. With relatively low temperature inner the grinding chamber, it's the unique pulverized coal production process of MTW European Mill. This process system features simple and easy control and can remarkably improve the safety performance of the production line.

The MTW series European Mill adopts multiple advanced technologies, including integral bevel gear drive, internal thin oil lubrication system, and online measurement of oil temperature, and boasts multiple proprietary patented technological property rights, characterized by small occupational area, low comprehensive investment, low operating cost, high efficiency, and environmental protection.

To be fire-proof and explosion-proof during the pulverized coal production, the production line is equipped with nitrogen system, CO, and CO2 fire extinguishing system to guarantee running safety and stability of equipment to the maximum extent.

Meanwhile, the effective measures are taken to strictly control the dust concentration of exhaust gas within the national specified range. The production line adopts the pulse dust collector manufactured with advanced technologies to reduce the influence on the surrounding environment to the maximum extent.

A coal-fired boiler reformed by pulverized coal atomization technology can promote the combustion efficiency to 98%, the thermal efficiency to >90%, and steam output per ton from 5.5T to >9T. Compared with a traditional coal-fired boiler, it can save coal by >30%, electricity by 20%, water by 10%, land by 60%, and manpower by 50%. The pulverized coal produced realized RMB 800 million of sales volume and RMB 100 million of profit and tax.

After atomization, the pulverized coal produced by this production line is supplied to the industrial boiler for combustion, which breaks the traditional combustion method by block coal. The efficient and clean use of coal boosts the transformation and upgrading of coal industry. It's of enlightening significance for the coal enterprise to successfully live through this severe situation.

Due to large scale of this pulverized coal production line and strict quality requirement on pulverized coal, through extremely careful selection of manufacturers and the long-time multi-aspects investigation, we finally selected the equipment manufactured by SBM. From the site investigation to the installation and commissioning, we received professional solutions and services and four coal pulverization mills (Phase-II) are running well, with the production capacity exceeding the design capacity.

The core of this technology is the "pulverized coal configuration and multiple vortex atomization", namely the high-speed air vortex is mixed with grained coal of 200 mesh into the vortex atomizer so that the pulverized coal and the air are sufficiently mixed and atomized to form a vortex and are fed into the boiler for floating combustion to realize high-efficiency combustion via thermodynamic system, measurement and control system, and exhaust gas purification system, with the emission meeting the emission standard of natural gas.

The pulverized coal used in the high-efficiency pulverized coal boiler system is selected, dried, and ground to be pulverized coal of 200 mesh for centralized management and distribution, which can effectively guarantee the quality stability of pulverized coal and eliminate the scattered coal piles and reduce the surrounding pollution, featuring high efficiency and energy conservation, clean emission, high automation level, environmental-friendliness, and outstanding economic, environmental, and energy conservancy benefits. The vigorous development, promotion and application of high-efficiency and environmental-friendly pulverized coal boilers is of important significance to boost the clean and efficient coal utilization, improve the atmospheric environment, and develop the energy conservation and environment protection industry.

coal mill manufacturers & powder making machine price

coal mill manufacturers & powder making machine price

Coal is a kind of carbonized fossil mineral. It is organized by carbon, hydrogen, oxygen, nitrogen and other elements, majority used as fuel by human. At present, the coal has 63 times of explored reserve volume than petroleum. Coal was called the black gold and the food of industry, is the major energy since the 18th century. During the Industrial Revolution, along with the invention and application of steam engine, coal is widely used as industrial fuel and brought unprecedented huge productive forces for the society. CategorySoft coal Meager coal Lean coal Coking coal Fat coal Gas coalWeak bond coalNon-bond coalLong flame coalBrown coal Volatility 0~10 >10~20 >14~20 14~30 26~37 >30 >20~37 >20~37 >37 >40 Cinder characteristics / 0(powder) 0(blocks) 8~20 12~25 12~25 9~25 0(blocks)~9 0(powder) 0~5 / Brown coal: Majority in blocks shape, in dark brown color, dark gloss, loosen character; containing 40% volatile component, has low ignite point, generally applied in gasification and liquidation industry, power boilers, etc. Soft coal: Majority in granularity, little bulk or powder, in black color with glossy, meticulous character, containing over 30% volatile component, ignite poi is not high; most soft coal is tough and is easy slagging when burned. Soft coal is widely used in coking, coal blending, power boiler and gasification industry. Hard coal: Blind coal is in powder or little bulk shape, in black color with shining metallic luster. The coal has low impurity, high content of fixed carbon (over 80%); the coal has low volatile component of lower than 10% and high ignite point. When burned, coal soil should be added to reduce thermal power. Blind coal can be made into coal gas or used as fuel directly.

Coal is a kind of carbonized fossil mineral. It is organized by carbon, hydrogen, oxygen, nitrogen and other elements, majority used as fuel by human. At present, the coal has 63 times of explored reserve volume than petroleum. Coal was called the black gold and the food of industry, is the major energy since the 18th century. During the Industrial Revolution, along with the invention and application of steam engine, coal is widely used as industrial fuel and brought unprecedented huge productive forces for the society.

Majority in blocks shape, in dark brown color, dark gloss, loosen character; containing 40% volatile component, has low ignite point, generally applied in gasification and liquidation industry, power boilers, etc.

Majority in granularity, little bulk or powder, in black color with glossy, meticulous character, containing over 30% volatile component, ignite poi is not high; most soft coal is tough and is easy slagging when burned. Soft coal is widely used in coking, coal blending, power boiler and gasification industry.

Blind coal is in powder or little bulk shape, in black color with shining metallic luster. The coal has low impurity, high content of fixed carbon (over 80%); the coal has low volatile component of lower than 10% and high ignite point. When burned, coal soil should be added to reduce thermal power. Blind coal can be made into coal gas or used as fuel directly.

Coal can be classified into 10 classes. Lean coal, coking coal, fat coal, gas coal, weak bond coal, non bond coal, jet coal are generally called soft coal; meager coal is called semi-anthracite coal; coal with volatile component over 40% is called brown coal. Brown coal: Majority in bar shape, in dark brown color, dark gloss, loosen character; containing 40% volatile component, has low ignite point, generally applied in gasification and liquidation industry, power boilers, etc. Soft coal: Majority in granularity, little bulk or powder, in black color with glossy, meticulous character, containing over 30% volatile component, ignite poi is not high; most soft coal is tough and is easy slagging when burned. Soft coal is widely used in coking, coal blending, power boiler and gasification industry. Blind coal: Blind coal is in powder or little bulk shape, in black color with shining metallic luster. The coal has low impurity, high content of fixed carbon (over 80%); the coal has low volatile component of lower than 10% and high ignite point. When burned, coal soil should be added to reduce thermal power. Blind coal can be made into coal gas or used as fuel directly.

Mainmillmodelselectionplan 200meshD80-90RaymondmillCapacity<20T/h,withbettercost-effective Verticalmill Capacity>20T/h,withbetterperformance Remarks: 1.Powerconsume:20-24Kw/h,accordingtorawmaterialandproductrequirement; 2.Advantagesofverticalmill:stableoperation,savingenergyandlabelcost; 3.Selecttheequipmentaccordingtocapacityandfinenessrequirement; 4.Majorapplication:heatingpowercoalpowder. HCSeriesGrindingMillcapacitytable(200meshD90) HC1300HC1700HC2000 Capacity(t/h) 3-5 8-12 15-20 Mainmillmotor(kw) 90 160 315 Blowermotor(kw) 90 160 315 Classifiermotor(kw) 15 22 75 HLMVerticalCoalMilltechnicaldiagram(metallurgyindustry) ModelHLM1300MFHLM1500MFHLM1700MFHLM1900MFHLM2200MFHLM2400MFHLM2800MF Capacity(t/h) 13-17 18-22 22-30 30-40 40-50 50-70 70-100 Materialmoisture 15% Productfineness D80 Productmoisture 1% Mainmotorpower(kw) 160 250 315 400 500 630 800

2. Vertical coal mill (HLM Vertical Coal Mill): high capacity, large-scale production, easy maintenance, high automatic level, advanced technology. Disadvantages are high investment cost and large floor space.

Phrase two: drying and grinding 1.Coal material with low moisture will be sent to the storage hopper by the elevator, and than the feeder will send the material to the main mill for grinding. The hot air in the mill will dry the coal. This will reduce drying cost. 2.For high moisture material, a dryer should be applied to dry the coal before grinding.

Phrase four: production collecting Qualified powder will flow with the air and be collected in the dust catcher, then the finished powder will be transported to the product storage bin through discharge port. Lastly, the powder will be loaded by tank car or packed by packing machine.

HC1700 Grinding Mill has open circuit system and explosion-proof device, and has 30%-40% higher capacity than traditional Raymond Mill. The whole system is under full automatic control, the easy operation saves up large operating cost. The high-tech equipment brought us large benefit, we are very satisfied with it.

Simply complete the form below, click submit, you will get the price list and a Hongcheng representative will contact you within one business day. Please also feel free to contact us by email or phone. ( * Denotes a required field).

Copyright 2004-2018 by Guilin Hongcheng Mining Equipment Manufacture Co. LTD All rights reserved Tel: |FAX: | E-mail: [email protected] | After-Sales-Service:+86-400-677-6963.

coal powder processing

coal powder processing

It is used to produce clean coal powder, activated carbon, humic acid and so on. Clean and efficient utilization of coal has been officially listed in the Plan, and there is a broad prospect for further coal processing in the future.

Pulverized coal to 150-200mesh and sprayed into the furnace can burn more fully. Impurities can be effectively removed in the grinding process, and the burnout rate is higher. (1) Grinding Stage: Moist coal should be dried first, and then sent to the main grinding room for grinding. The fine powder after grinding is classified by the analyzer under the action of the air flow of the fan, and the qualified fine powder enters the collection stage through the air outlet pipeline. (2) Collecting Stage: The fine powder with qualified fineness enters the pulse dust collector. It is separated by inertia force and falls into the bottom of the ash bucket. Residual dusty gas enters the bag filter area. With the extension of filtering time, dust will accumulate on the surface of the bag. The solenoid valve will flush compressed air into the bag quickly, shake down the dust on the surface of the bag, and all the dust will fall into the ash bucket, collect and discharge centrally. (3) Conveying Stage: The finished pulverized coal collected by dust collector is sent from screw conveyor to plate chain hoist, and then into finished material tank. The dust gas in the tank is collected by the top dust collector, the finished product is stored, and the clean gas is discharged. (4) Finished Product Stage: The pulverized coal obtained from the powder can be directly sent to the customer for on-site use without additional downstream processing procedures.

Advantages: The production of clean pulverized coal for boiler combustion, heating and power supply improves the operation efficiency of small and medium-sized coal-fired boilers to 80%. It can reduce the emission of harmful gases and dust, achieve the national energy saving and emission reduction standards, and at the same time, it can increase the benefits of enterprises.

Advantages: Humic acid fertilizer has the advantages of improving soil, improving crop production and avoiding soil consolidation. It is a kind of green environmental protection high-tech fertilizer, which realizes the efficient utilization of coal. In recent years, the series of humic acid products are increasing day by day, which are exported to foreign countries and create tremendous value for enterprises.

Advantages: Coal-based activated carbon is widely used in deep purification of drinking water, industrial water and wastewater because of its reasonable pore structure, good adsorption performance, high mechanical strength, easy regeneration and low cost.

High efficiency pulverized coal industrial boiler system mainly includes 11 integrated equipment units(stations), namely pulverized coal storage and supply unit, burner unit, boiler body unit, dust removal unit, desulfurization unit, thermal unit, ignition oil and gas station, inert gas protection station, compressed air station, fly ash collection and storage unit and measurement and control unit.

Closed tank trucks from pulverized coal processing plants inject pulverized coal that meets the quality standards into the pulverized coal tower. The pulverized coal in the tower is fed into the pulverized coal burner by the feeder and the air-pulverized mixture pipeline after entering the intermediate metering bin as required. The high temperature flue gas produced by pulverized coal combustion in the boiler furnace completes radiation and convection heat transfer, and then enters the bag filter and desulfurization device. The clean flue gas discharged by the dust collector is discharged into the atmosphere through the induced draft fan, and the fly ash collected by the dust collector is discharged through the closed system for centralized treatment and utilization. The operation of the boiler system is accomplished by the ignition program controller and the upper computer monitoring system.

annual output of 1 million tons of clean coal--- the preparation demonstration line at

annual output of 1 million tons of clean coal--- the preparation demonstration line at

This energy enterprise is the R&D base of coal clean & efficient utilization in Shandong, the micro-coal pulverization technology of which can greatly promote the transformation and upgrading of coals. During the process, the micro-coal is the pulverized particle processed by mills to meet fineness requirement. The line makes fuels combine with air by pulverized technology and after rotary current appears, the fuels conduct float combustion in the industrial boiler and reach high-efficient combustion by thermal, measurement & control and exhaust gas purification systems at natural gas emission levels. The 4 sets of MTW and auxiliary equipment are used for pulverized coal production, which can not only improve input-output ratios, but also greatly ease emissions of dust, sulfur dioxide and nitrogen oxides.

According to reports of Coal Association, more than 70% coal enterprises are faced with grim situations --- losses which make the transformation of the coal industry urgent. So, under the premise of controlling total amount of coal consumption, how to improve economic benefits of traditional coal enterprises, how to utilize coal resources efficiently and how to reduce coal pollution on environment have become the problems explored by many enterprises.

According to reports of Chinese Coal Association, over 70% coal enterprises are faced with grim operation situations --- losses. Meanwhile, the country is also actively promoting market-oriented reforms and structure adjustment of coal industry at the policy level. Under the context of disentangling relationship between supply and demand, the transformation of the coal industry becomes urgent.

National Energy Administration recently released Action Plan on Clean & Efficient Utilization of Coal (2015-2020), which stipulated key tasks in 7 aspects. Of them, efficient boilers in partial areas should be up to above 50% by 2020. The Fifth Plenary Session of the Partys Eighteenth Conference proposed promoting clean& efficient utilization of fossil energy. Obviously, efficient and environmental coal boilers are key energy-saving technology projects promoted by our country.

Shandong government provides subsidies for some key PPP projects at early stage. Meanwhile, the government announces the notice to formulate efficient and environment-friendly coal boiler promotion action plans (2016-2018): the boiler is mainly used for steam and heat supply and focuses on five-one project to accelerate popularization and application of it.

The traditional industrial boiler adopts bulk coals as fuels with large emissions of smoke and gas pollution, while if it adopts pulverized coal as fuels ---- smoke dust 30mg/m3, sulfur dioxide 100mg/m3, nitric dioxide 200mg/m3, which are below national emission standards and meet local environmental demands.

When the traditional coal-fired boiler is transformed into pulverized boiler, the coal combustion efficiency is higher than 98%, thermal efficiency higher than 90% compared with traditional ones. The comprehensive operation cost declines by 20-30%. Compared with natural gas boiler, the fuel procurement cost of pulverized coal boiler is about 1/3 of that of natural gas boiler.

4 sets of MTW European Mills (the second phase): The integrated system of MTW European mill is the new generation of grinding equipment with worlds advanced level. The equipment adopts bevel gear transmission as a whole, internal thin oil lubrication system, online measuring of oil temperature and many other advanced technologies with multiple intellectual property rights. The whole system has the advantages of small occupying areas, less comprehensive investment, low operation costs, high efficiency and environmental protection and so on.

After being compressed by compressors, the air enters into high-efficient degreaser to remove most oil, water and dust; then it enters into frozen air-dryer to remove a lot of water, then enters into dust filter to remove dust, and finally enters into gasholder for buffering as well as oxygen & nitrogen separation system of adsorbents, namely nitrogen-making machines. Clean compressed air enters from the bottom of the adsorbent; the airflow evenly enters the adsorbent after air dispersion with nitrogen flows out from the outlet into the nitrogen gas buffer tank.

When temperature inside the protection zone exceeds default alarm temperature, the alarm signal will be delivered to the host alarm; when the host alarm gives orders, the alarm ring will give an alarm and the carbon monoxide concentration alarm signal will also be connected to the fire-alarm host through signal lines; when the carbon monoxide concentration is more than the default alarm concentration, the sound & light alarm will begin to alarm and the alarm host will start 30s delay reverse; when it reverses to 0, the host alarm sends signals to carbon dioxide fire-extinguishing system and the nitrogen-cylinder starts to open corresponding magnetic valve, namely the nitrogen starts this system to extinguish fire. The system has four control methods, including automatic, manual, mechanic emergency hand-control and urgent stop & start.

With the industrial computer as the core unit of the whole system, the central-control system can read out PLC or ECS through various communications technologies. It can control on-site equipment according to instructions from computers through acquisition of equipment status, thus realizing such functions as remote control of equipment, record & analysis of equipment information and printing of operation reports of equipment.

MTW European Mill is equipped with expert intelligent-control system designed especially for mills and adopts ESC intelligent control, which can realize both remote and central control by phones, ipad and other mobile devices, namely realizing the check of operation situation.

The raw material in the storehouse is conveyed to the scraper conveyor through the quantitative belt feeder and is dried up in the dryer, and then it is conveyed to the enclosed storehouse through sealed scraper conveyor and transferred to the warehouse by carrier vehicles and finally fed into the inside of MTW215 mill through weighing coal feeder. After being classified by powder concentrator, the ground powder enters into powder collector along pipes (residual air is collected by pulse dust collector). The collected finished coal powder enters into the coal elevator through spiral conveyor system for storage and is transported by tankers based on demands. The complete system is added with nitrogen-making system and carbon dioxide system to provide explosion-proof and extinguishing protection and explosion-proof valve is installed on key parts to prevent equipment damage.

In order to minimize construction period of project and reduce customer investment, this project adopts EPC service. It is a turnkey service designed especially by SBM targeting at customer demand --- production convenience. The service runs through all parts, including environment surveys, process design of production lines, test of raw materials, analyses of finished product, budget of investment costs, equipment installation & debugging, thus avoiding input delay for lack of construction materials and human resources. The EPC service has maximized production convenience and satisfied emergency needs of customers, which also receives high praise from customers in Shandong.

To improve operation performance of coal production line, this production line adopts unique two-step operation --- drying and milling. The two-step system refers to the solution to separating drying and pulverizing with lower temperature of grinding chamber. This preparation process is unique to MTW European Mill --- relatively simple and easy to control, which can greatly improve safety performance of the production line.

System composition: Raw coal bunker, Dryer, Weighing coal feeder, MTW Mill, Pulse dust collector, Powder collector, Fan, Coal bunker of finished product, Pulverized coal bunker, Monitoring system, Explosion-proof system, Central control system;

MTW mill adopts bevel gear transmission as a whole, internal thin oil lubrication system, online measuring of oil temperature and many other advanced technologies with multiple intellectual property rights. The whole system has the advantages of small occupying areas, less comprehensive investment, low operation costs, high efficiency and environmental protection and so on.

To ensure the fire-proof and explosion-proof performance of coal during preparation process, the production line is equipped with the nitrogen gas and carbon-dioxide extinguishing system to guarantee safety and stability of equipment in operation.

To reform the traditional coal-fired boiler with micro-coal atomization technology can improve combustion efficiency up to 98% and heat efficiency to 90% and improve tons of steam from 5.5tons to above 9 tons. Compared with the traditional coal-fired boiler, this technology can save over 30% coals, 20% electricity, 10% water, 60% land and 50% human resources; the coal sales reach 0.8 billion and profit tax reaches 0.1 billion.

The pulverized coal produced from this line is supplied for industrial boilers through micro-coal atomization technology, which has broken the traditional coal combustion status in bulks. So, it becomes the model of efficient and clean coal utilization and promotes the transformation of coal, which has great implications for coal enterprises to go through the cold winter.

As this coal production line was large and we had strict demands on coal quality, we were very prudent in the choice of manufacturers. After long-time consideration and inspection, we finally chose SBM which gave us professional solutions and services from on-site investigation to installation & debugging. The 4 sets of MTW we purchased are running very well with production beyond designed capacity.

boiler line spares alstom

boiler line spares alstom

[randpic] alstom coal mill spare parts manufacturers Grinding Mill The Gulin product line, consisting of more than 30 machines, sets the standard for our spare parts for boiler,spare parts brand spare part list,Spare Parts in MaREAD MORE

17 Jul 2014 With a wide range of capabilities and options for replacement parts supply, technical Alstom Solutions for Foster Wheeler Plants Boilers | 3-27 Figure 3-19 | A Boiler Electronics 29Boiler Electronics Pipe Igniters READ MORE

Pulverizer Mill of pulverized coal boiler in thermal power alstom coal pulverizer model alstom coal pulverizer spare parts from china alstom hp mining crushing machinery products or production line design the company is committed READ MORE

ALSTOM Grid can provide specialist technical services associated with the provision of spares, inspection, maintenance, movement, installation, disposal rating of transformers and tapchangers including auxiliary equipment such as On READ MORE

Our boiler mills and coal pulverizers span across the globe and have been built in a variety of CE (Combustion Engineering); ABB; EVT; Alstom key performance indicators, we offer a full line of parts, service, and solutions: BoileREAD MORE

Alstom supplies major equipment in 25% of the worldwide Opening of the new Wuhan Boiler factory in China Shanghai Metro Line 1. 2005 1,222 metro cars for 7 Shanghai lines New spare parts and reconditioned components.READ MORE

dedicated pulverized coal boiler equipment | stone crusher and mill

dedicated pulverized coal boiler equipment | stone crusher and mill

Advantages of pulverized coal boiler equipment: 1. Reducing energy consumption and pollutant emissions: The conventional pulverized coal-fired boiler to burn pulverized coal boiler is higher than 98%, the boiler thermal efficiency higher than 90%, compared with 30% energy saving over traditional boiler soot 30mg / m3, sulfur dioxide 100mg / m3, nitrogen oxides 200mg / m3, lower than the national emission standards, to meet stringent environmental requirements throughout. 2.Improve economic efficiency: Compared with traditional pulverized coal boiler coal-fired boiler, equipment and control part of the investment was essentially flat, but less than in the conventional pulverized coal boiler boiler land 60%, no grate, coal, slag and other ancillary equipment, can be automated operation, equipment maintenance and significantly reduce labor costs, integrated operating costs reduced by up to 20-30%; compared with gas-fired, pulverized coal boiler unit fuel procurement costs only about one-third of the calorific value gas boiler. 3. To promote the development of downstream industries: Fly ash produced after coal combustion can be used to produce new building materials, and promote the development of building materials industry chain.

By feeding coal into the coal belt conveyor warehouse for storage, enclosed by quantitative feeder feeds the coal inside LM vertical mill, hot air from the hot air into the system LM vertical mill inside, and coal mixing drying, enters the grinding chamber by a roller tray coal grinding and dynamic and static separator powder classifying, along a pipe into the coal mill dedicated dust collector pulse powder explosion collect, aggregate collection of finished pulverized coal by screw conveyor into the finished product coal warehouse for storage (also by pneumatic conveying, etc.), as needed transported by tankers. The entire system has a nitrogen system and carbon dioxide fire extinguishing system, providing explosion and fire protection, the key components are mounted explosion-proof valve.

Coal within the coal storage, transport equipment by entering the drying equipment for drying (optional on demand), by lifting machines and other equipment into the former mill surge bin, after drying coal via closed-quantitative feeder (or vibration feeder) after the coal feed MTW European version of the mill inside, powder separator after grinding through classification, along the pipeline into the powder collector (or coal mill special explosion-proof pulse dust collection, the collection of finished pulverized coal by pneumatic conveying system into the finished coal warehouse for storage (optional pneumatic conveying mode), as required by the tanker transport. The entire system can increase nitrogen system and carbon dioxide systems, providing explosion and fire protection, the key components are mounted explosion-proof valve, prevent equipment damage.

MTW Series European version of the mill complete system, a new generation of milling equipment with the world advanced level. The device uses a bevel gear overall drive, internal lubrication system, oil and many other online measurement world advanced technology, with a number of independent patent property rights, has a small footprint, low overall investment, low operating costs, high efficiency, environmental protection and many other advantages. System components: raw materials warehouse, closed dosing machine (optional), MTW European version of the mill, powder collector (coal mill dust explosion), fan, separator, drying systems, conveyor systems and so on.

MTW Series European version of the mill complete system, a new generation of milling equipment with the world advanced level. The device uses a bevel gear overall drive, internal lubrication system, oil and many other online measurement world advanced technology, with a number of independent patent property rights, has a small footprint, low overall investment, low operating costs, high efficiency, environmental protection and many other advantages. System components: raw materials warehouse, closed dosing machine (optional), MTW European version of the mill, powder collector (coal mill dust explosion), fan, separator, drying systems, conveyor systems and so on.

coal mill in cement plant, air-swept coal mill | coal mill

coal mill in cement plant, air-swept coal mill | coal mill

Air-swept coal mill is the main equipment of cement plant, also called coal mill in cement plant, used for grinding and drying various hardness of coal, crushing the coal briquette into pulverized coal. It is the important auxiliary equipment of pulverized coal furnace. The air-swept coal mill runs reliably, can work continuously, also has a large production capacity and less energy consumption. Air-swept coal mill is mainly used in cement, industrial boiler, ceramic products, thermal power generation, industrial boiler, chemical fertilizer, and other industries.

It mainly consists of a feeding device, main bearing, rotating part, driving device, feeding and discharging device, high-pressure starting device, and lubrication system. The feeding device includes the feeding pipe, the air inlet pipe, and the support. The feeding device of the coal mill adopts the oblique inlet wind and the oblique inlet louver structure to make the feeding more smooth, while the discharging device adopts the curved tube structure.

Raw coal is fed into feeding device of coal mill in cement plant, the hot air with temperature about 300 through the duct into the feeding device, there is a special lifting board in drying storehouse board will raise the raw coal, and helps the raw coal exchange heat and be dried, dried coal enter into the grinding storehouse.

There is a grinding body (steel ball) in the silo where the coal is crushed and ground into pulverized coal. At the same time when the coal is crushed, the pulverized coal and gas are taken out of the coal mill by the special induced fan through the discharging device of the coal mill, and the coarser particles will be returned to the pulverized silo through the return screw of the discharging device for further grinding.

wholesale boiler suppliers & manufacturers | bidragon

wholesale boiler suppliers & manufacturers | bidragon

Our factory is authorized to produce Grade A pressure vessels by government. Weve got many technical patents of wholesaleboilers. With professional designing engineers an experienced operation staff, our boilers are with perfect quality and performance.

4.Localized service office in Bangladesh: providing prompt response to all customer's inquiry and questions. Solving customer's after sale problems more efficiently. We are consultants and assistants for boilers at your side, whom you can easily get in contact with. You can rely on us.

Bidragon Group is one of the leading boiler suppliers in China. Bidragon boiler suppliers have been manufacturing and exporting steam boiler, thermal oil boiler, hot water boiler,and wholesale boiler for more than 20 years. Our boilers have been delivered to more than 60 countries all over the world. Our boilers are highly praised by all customers for strong quality and golden service. Honesty is our company faith, quality is our soul, and customers satisfaction is the best praise for us. Welcome to visit our boiler factory!

classifying and ball mill production line - alpa powder technology

classifying and ball mill production line - alpa powder technology

ALPA enjoys a high reputation in more than 100 countries and regions around the world. With its high-quality products and services, it has won the trust of many well-known brand companies around the world.

The product particle size control is flexible, special design is adopted to reduce noise and emission. Automatic control, easy to operate. According to the scale of investment, it provides personalized customized scheme and provides value-added services.

According to different materials and application industries, the production capacity and particle size range will be different. Please contact our engineers to customize the equipment for you. Our experts will contact you within 6 hours to discuss your needs for machine and processes.

After coarse crushing, the material is fed into the ball mill through a controllable feeding device. The grinding medium in the mill repeatedly impacts and grinds the material by virtue of the kinetic energy obtained when the mill rotates. The crushed material is discharged into the suction tank through the tail of the ball mill, and then transported to the classifier for classification by negative pressure. The qualified fine powder is collected by cyclone collector or dust collector, The coarse particles after classification are discharged from the lower end of the classifier, and then re-enter the ball mill for crushing through the feeding pipe.

Note: The production capacity is closely related to the particle size, specific gravity, hardness, moisture and other indicators of the raw materials. The above parameters are for reference only, please consult our engineers for details.

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