coal stone ball press machine in south africa

coal stone ball press machine in south africa

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coal pulverizer

coal pulverizer

Power generation industry studies have shown that coal pulverizers are an area where improved equipment reliability is badly needed. The Electric Research Institute (EPRI) has determined that 1% of plant availability is lost on average due to pulverizerrelated problems.1 EPRI also identified oil contamination and excessive leakage as two areas where pulverizer drive train failures account for 53% of pulverizer problems.

Pulverization is currently the favored method of preparing coal for burning. Mechanically pulverizing coal into a fine powder enables it to be burned like a gas, thus allowing more efficient combustion. Transported by an air or an air/gas mixture, pulverized coal can be introduced directly into the boiler for combustion.

This type of mill consists of a rotating tube filled with cast alloy balls. Coal is introduced through two hollow trunnions on each side of the tube. As the tube rotates, the balls tumble onto the coal, crushing and pulverizing it.

Grinding Action is carried out by a series of hinged or fixed hammers revolving in an enclosed chamber with wear resistant plates. The hammers impact on the coal, crushing it against the plates. Further pulverization is achieved as the smaller coal particles are ground through attrition against each other and the grinding face.

This mill uses hydraulically loaded vertical rollers resembling large tires to pulverize raw coal fed down onto a rotating table. As the table rotates, the raw coal is pulverized as it passes underneath the rollers. Hot air forced through the bottom of the pulverizing chamber removes unwanted moisture and transports the pulverized coal dust up through the top of the pulverizer and out the exhaust pipes directly to the burner. The more recent coal pulverizer designs are Vertical Roller Mills. Figure 2 shows a cutaway view of a Babcock and Wilcox MPS Pulverizer.

Mills A ball or roller between two races or rings provides the grinding surfaces on which pulverization occurs. One or both of the races may rotate against a ball or roll (in a Ring-Roll Mill the rolls may rotate while the ring is stationary). Ring-Roll (Bowl-Mill) and Ball-Race Mills comprise the majority of coal pulverizers currently in service at power generating facilities.

In this design the grinding rolls are stationary, while the ring (or bowl, as it is sometimes called) is rotated by a worm gear drive. Powerful springs force the grinding rolls against the ring, providing the pressure required to pulverize the coal.

Raw coal enters the top of the pulverizer through the raw coal feed pipe. The raw coal is then pulverized between the roll and rotating ring. Hot air is forced in through the bottom of the pulverizing chamber to remove unwanted moisture and transport the coal dust up through the top of the pulverizer and out the exhaust pipe directly to the burner. Coal that has not been pulverized into fine enough particles cannot be blown out of the top of the unit; it falls back to the ring and roll to be further pulverized.

The gears and bearings in the gearbox are oil lubricated. Fine coal particles and wear metals from grinding surfaces enter the lube oil through worn bearing and shaft seals, as well as being inhaled through reservoir vents. Historically, the design of pulverizers has been based on the expectation of few drive system problems under prescribed operation and maintenance. In practice, this has often been found not to be true.

Many coal pulverizer designs do not incorporate any filtration in their lube circuits. The pulverizers that do not incorporate filtration use coarse filtration such as 40-micron cleanable mesh or 200-micron cleanable, stacked disk filters. Such OEM-supplied filtration is often unable to keep up with the inherently high ingression rate. This results in contamination levels often exceeding ISO code 30/30, particularly on older designs. This high level of contamination can severely diminish bearing, gear, pump, and seal life, leading to premature need for replacement or rework. Coal pulverizer downtime can be a major factor in reducing overall plant availability and reliability.

Upgrade to Achieve Total Cleanliness Control (See diagrams on back page) The majority of pulverized coal particles are in the 4-30m range, with 70% of these particles smaller than 10m. Ingression rates vary with manufacturer, model, and age ofunit, with older units usually admitting contaminants faster than newer ones. Particulate contamination in the lube system can result in rapid damage to critical components.

In order to protect the coal pulverizer lube system components, Pall recommends maintaining a fluid cleanliness level of ISO 16/13 or better. This can be accomplished through the use of Ultipleat SRT AS grade (12(c) 1000) or finer filters. Ultipleat SRT filters, with their high particle removal efficiency and dirt-holding capacity, are ideally suited to cost-effectively control contamination in this high-ingression application.

When upgrading in-line filtration, a Pall Duplex Assembly is recommended so that elements can be changed out while the pulverizer is operating. Although putting filtration in-line is preferred, difficulty in getting system specifications from the OEM, combined with the typically low pump pressure associated with this application, may make kidney loop filtration a more viable alternative. Reservoir volumes typically vary from 15-300 gallons.

A 20% reservoir volume per minute flow through a kidney loop is generally sufficient to overcome the ingression rate of most applications. The high-viscosityof gear lube oil (2,200 SUS at operating temperature) along with the inherently rapid ingression rate usually associated with these units makes it necessary in most cases to utilize at least one UR619 housing with a UE619 element (12(c) 1000 or finer) for every 50 gpm of flow to provide superior filtration with long element life. Since the pulverizers come on- and off-line, it is important to size the system for the oil viscosity at the coldest possible ambient plant temperatures. Line diameters in the kidney loop should be large enough to facilitate flow of highly viscous lube oil.

Other applications where Pall high-performance filtration is useful include coal-carrying cars and conveyor belts. Many of these applications have both hydraulic and lube systems that are vulnerable to coal dust contamination. This equipment is required to transport the coal stored on-site to the coal pulverizers. Because this equipment is essential to theoperation of the power plant, it is critical that this equipment be free from contamination-related failure.

In March 2003, a major Canadian utility derated its Unit 4 due to a failure of the B mill. The mill was expected to be out of service for about a month. With lost production of approximately 864 MWh per day, the total estimated revenue loss was around $2,000,000. Repair costs for this outage added up to more than $400,000 due to the severity of the damage to drive train components. An analysis concluded that there were multiple causes of this problem, including poor predictive/preventive maintenance practices and poor oil cleanliness.

Pall provided a filter housing for a sixmonth trial to show that oil cleanliness could be improved to industry standards and maintained without the incurrence of substantial element costs. Oil cleanliness went from 20/19/17 to 18/16/13 in approximately 2 hours and has been maintained at this level since.

reliable steam generation in coal-fired power stations | isolated barriers | signal conditioners

reliable steam generation in coal-fired power stations | isolated barriers | signal conditioners

In a coal-fired power station, the steam required to drive the turbines is generated by burning pulverized coal. The energy released during this process heats a boiler with integrated piping. The water that is fed into this boiler is then converted into steam. To ensure reliable and efficient operation, it is necessary to monitor the injection of pulverized coal into the burner with a defined air quantity, as well as the superheater, the preheating unit for the feed water, and the combustion air. This requires the signals to be transmitted reliably between the plant and the control room.

Monitoring the pulverized coal in terms of quantity and pressure ensures that the plant operates in an optimum temperature range and that, to a certain extent, it is possible to match loads. The pipes in the superheater banks and the preheating unit for the feed water and air are monitored with regard to temperature, flow, and/or pressure to ensure the optimum process parameters are maintained. In addition, deposits on the surface of the boiler and pipe interior are detected early, preventing increased energy requirements and thermal stresses in the metal.

The interface modules of the K-System, which features galvanic isolation and delivers functional safety up to SIL3, transmit signals between individual system components and the control room without any interference. The product range includes both isolated barriers for intrinsically safe applications, to protect the hazardous area against an excessively high energy input, as well as signal conditioners for nonhazardous areas. The interface modules control the pressure and quantity of pulverized coal that is supplied and monitor the temperature, flow, and pressure of the superheater, burner, and feed water.

Using transmitter supply devices to monitor the pressure and flow is not only relevant for supplying pulverized coal to the burner; measurement data from the superheater and preheater for the feed water and combustion air are also transmitted to the control room reliably and without any interference. Temperature converters with trip values are used to measure impermissibly high or low temperatures. They protect against the effects of deposits in pipes and damage to turbine blades caused by water droplets, and enable an optimum efficiency factor.

Pepperl+Fuchs is a leading developer and manufacturer of electronic sensors and components for the global automation market. Continuous innovation, enduring quality, and steady growth have been the foundation of our success for more than 70 years. Pepperl+Fuchs employs 6,300 people worldwide and has manufacturing facilities in Germany, USA, Singapore, Hungary, Indonesia and Vietnam, most of them ISO 9001 certified.

ball mill for sale | mining and cement milling equipment

ball mill for sale | mining and cement milling equipment

Anyang General International Co., Ltd. (AGICO Group) is a ball mills supplier. Our company is mainly engaged in the development, design, manufacture, installation and commissioning of various mining and cement milling equipment and a complete set of the industrial grinding line. AGICO Group was founded in 1997, registered capital 81.34 million yuan, covers an area of 66,000 square meters, has nearly 30,000 square meters of factory buildings and more than 150 sets of various production and processing equipment.

With more than 20 years of experience in the manufacturing and research of mineral and cement milling equipment, AGICO has more than 50 technical patents. All of our ball mills, vertical roller mill, rod mill and AG/SAG mill have passed the ISO9001 international quality system certification.

The ball mill has a vital role in the cement manufacturing process. The mixed raw materials (cement raw meal) before cement production and the finished products (cement clinker) after cement manufacture need to be ground by cement ball mill. The grinding media balls in the ball mill are used in cement plant to help grind blocky or granular grindable materials produced in the cement manufacturing process, so as to achieve the effect of grinding. Vertical roller mill(VRM) and clinker grinding mill and other cement grinding mill are also very common in cement plant.

Various ball mill machines, vertical roller mills and sag mills are widely used in the mining industry. Grate ball mills and raw mills are mostly used for mineral processing in some enterprises of mining industries. Wet ball mill and rod mill are commonly used in mineral processing production line, to grind various hardness ore materials. Customers who need to grind iron ore, siderite, marble, kaolin, mica, feldspar and other ores have chosen our mineral grinding machine.

AGICO uses the latest clean coal technology to create a professional pulverized coal ball mill. Coal mill can grind pulverized coal with different fineness requirements, with high fineness and large output, which can meet the needs of large pulverized coal projects. Coal mill is often used in thermal power plant, cement plant, coal fire power plants, etc. We grind large pieces of coal into pulverized coal, which produces more energy when burned. Therefore, the rotary kilns, boilers and other kiln equipment in these large factories usually use pulverized coal as fuel.

Efficient and energy-saving ball mill, intermittent ball mill, ceramic ball mill, rod ball mill. These types of ball mills can crush materials with different attributes. It is widely used in silicate products, new building materials, refractories, fertilizers, ferrous and non-ferrous metal smelting, glass ceramics and other production industries. Vertical mill, Raymond mill, ring roller mill which divided by different grinding methods can also be used for the production of phosphor powder, nano materials, zinc oxide powder, catalyst, rare earth polishing powder and other materials.

Production capacity: 300t/d Processed material: Silver ore Input size: 25mm Equipment: Wet grate type silver ore ball mill, wet overflow type silver ore ball mill, jaw crusher, cone crusher, flotation machine, concentrator, filter press. Auxiliary equipment: Linear vibration screen, cyclone. Request A Quote Right Now Free Solution Design: [email protected] Project Description Equipment Features Beneficiation Process

Production capacity: 1500t/d Processed material: Copper ore Input size: 25mm Equipment: 98-386t/h copper ball mill, jaw crusher, cone crusher, flotation machine, concentrator, filter press. Auxiliary equipment: Linear vibration screen, cyclone. Request A Quote Right Now Free Solution Design: [email protected] Project Description Equipment Features Beneficiation Process Project Description The 1500t/d Pakistan copper mine project uses a

Production capacity: Annual output of 300,000 tons Processed material: Soft coal Input size: 25mm Equipment: 5 sets of 20tph coal ball mill Auxiliary equipment: Desulfurization, denitrification, dust removal and other devices. Request A Quote Right Now Free Solution Design: [email protected] Project Description Equipment Features Solution Advantages Project Description The project is to build a high-efficiency

Influencing Factors of Tumbling Mill Working Capacity Tumbling mill is also known as a ball mill or rod mill. They are all composed of a cylindrical cylinder lying horizontally on the bearing, and the material is ground into powder by rotating the cylinder. When we want to discuss the factors that affect the tumbling mill

The grinding mill liners are the main wearing part of the ball mill equipment. The ball mill liner replacement should in time when the lining plate is excessively worn. Therefore, the selection and design of mill liners have always been of great concern to users. Function Design of Ball Mill Liners As one of professional

As a ball mills supplier with 22 years of experience in the grinding industry, we can provide customers with types of ball mill, vertical mill, rod mill and AG/SAG mill for grinding in a variety of industries and materials.

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