In the cement plant ,The main fuel used for firing preheater cyclone and rotary kiln is coal. Therefore, coal plays an important role in the manufacturing process of cement. Based on the composition of raw feed a wide range of coal is used. In a cement plant two systems of coal firing are used, namely, a) Direct firing and b) Indirect firing.
In direct firing system, coal is milled on line and is directly fed to the kiln. The primary air is used to dry the coal. High moisture coal is not suitable for direct firing, as this has the effect of lowering the flame temperature and therefore the process efficiency. Excess of primary air should not be allowed, as this has also a similar effect like high moisture.
In indirect firing system, coal is milled off line and stored in a bunker from where it is fed to the kiln as per the requirement. During storage of coal the propensity for spontaneous heating should be kept in mind.
During the production process of cement it is normal to have some build up of deposits in the clinkering zone of the kiln, but excessive deposits can hinder the movement of solids through the kiln. The deposit formation is commonly associated with the presence of chlorine, sodium, potassium and sulphur. Coal with high chlorine or sulphur is not favoured in the cement plant.
In the coal crushing plant, coal crushing can resize the coal stone so that it can be easily handled and processed. For the Mosh hardness of coal is usually under 5, the miners can use jaw crusher, JC jaw crusher, impact crusher, hammer crusher etc. to handle it. After the coal has been crushed, we need vibrating screen to grade the coal by size and then transport the coal via belt conveyor. In this process, dewatering screen is optional to remove water from the product. As the largest exporter in the design and manufacture of coal crushers and spare parts, DSMAC crushers are used in a wide variety of material reduction and processing applications in 100 countries around the world.
As coal powder is the most important fuel in the power plant, The plant owners need coal mill or coal pulverizer to grind the coal to micro powders.
Raw coal (crushed) is fed through hopper at the top of the coal pulverizer and falls down to grinder ring to be pressed, crushed and milled into pieces by rollers. After the first crush, coal powder fall into the second and third layer. The pumping of the high-pressure centrifugal blower put the outside air into the coal mill. The coarse coal powder will be brought into the classifier.
As a pioneer in coal pulverizer, DSMAC has positioned itself well to meet the challenge of supplying coal mill with reliably quality and efficiently at the lowest cost.
In order to use coal more rationally, efficiently and effectively, the coal need to be processed and crushed into different sizes, 0 ~ 25 mm particle size for coal gas stove, 25 ~ 8 mm for steam locomotive, 25 ~ 6 mm for the industrial furnace, and coal power plant requires grain coal of 0 ~ 25mm. So coal processing includes coal crushing and coal grinding. Coal crushing plant consist of many types of crushers and grinding mills. Coal crushers including primary jaw crusher, secondary Impact crusher and cone crusher etc. Coal mill include ball mill, raymond mill,Vertical milletc.
If the coal block is bigger than the mill's max input size, it must be crushed before grinding. The crushing plant common includes Vibrating feeder as feeding material to jaw crusher, which is as primary jaw crusher. If need secondary crusher,Cone crusher or Impact crusher can be used. After primary crushing, the coal can be feeding to Ball mill to fine grinding. To increase Ball mill effective, the vertical coal mill or coarse powder mill can be setted before Ball mill as pre-grinding.
Main wear parts: Impact Blow Bars, Big Gold Teeth® Crusher Hammers, Sandwich® Super Crusher Hammers, Crusher Rotor, Jaw Plates ,Crusher Concave for cone crusher.
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