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Coal Mill

Coal Mill

Production capacity: 8–43 t/h
Feeding size: <25 mm
Main motor: 250–1250 kw
Material handling: raw coal, etc

The Application and Usage Range:

Coal mill is major equipment of cement plant and used for drying and grinding coal. The equipment mainly consists of feed device, main bearings, rotating parts, drive device, selling device, high-voltage start-up device and lubrication system.

The raw material is fed into mill by feeding equipment. The hot wind enters into the mill by inlet end. As the mill cylinder rotates, the coal and hot air exchange heat in the mill. The coal is crushed and ground in the mill. When the coal is ground, the powder is brought out of the mill by the hot air going through the mill. Compared with rock grinder, the coal mill we make is with reasonable structure, high grinding efficiency and is the ideal equipment for coal processing.

Coal mill - stone flour mill

Make the safe operation of coal mill : 

Improper operation of the coal mill may cause the explosion of coal powder kiln. What is the proper method to operate coal mill to avoid the disaster?
1. change the piling method of the coal to make the coal accumulate little amount, thus avoiding the spontaneous combustion of the coal.
2. change the gap of the great bar from 25mm to 22mm; thus decrease the wind speed and increase the drying speed.
3. add a settling chamber between the coal mill and the pipe; thus prevent the hot coal powder enter the coal grinding mill.
4. add a explosion-proof valve at the opening.
5. increase the fineness of the coal from 10% to 15%.
6. make up strict safety rules. 

Other information about coal mill

If the coal mill stops for 3 days, empty the coal hopper or put a layer of raw meat powder on the surface to isolate the coal from the oxygen before stopping the coal mill, close the hot wind valve and open the close wind valve and then stop the feeding. Remember to empty the coal in the coal mill before stopping the machine and not to stop the collector immediately .
Check the following things when operating the coal mill: the airing is ok; there is no overfeeding or underfeeding; the temperature is not too high; the order of starting and stopping the coal mill is right; the temperature of the air from the coal mill is higher the dew point.
Make an emergency plan; when an explosion happens, close the hot wind valve and the pneumatic valve, prevent the hot coal powder from entering the collector and if the temperature is over 80 degree centigrade, start the carbon dioxide extinguisher. We should pay attention to avoid safety problem in operating the coal mill. As long as we obey the safety rules, the safety problems surely can be avoided.

Technical Data
Spec. (m)Item Φ1.7×2.5 Φ2.2×4.4 Φ2.4×4.75 Φ2.4×4.5+2 Φ2.6×5.25+2.25 Φ2.8×5+3 Φ3.0×6.5+2.5 Φ3.2×6.75+2 Φ3.4×6+3 Φ3.8×7+2.5
Speed(r/min) 24.5 22.4 20.4 20.4 19.7 18.3 18.3 16.9 17.5 16.4
Capacity(t/h) 3-5 8-9 12-14 11-12 13-14 16-17 19-20 25-30 28-30 38-40
Feeding Size(mm) <25 <25 <25 <25 <25 <25 <25 <25 <25 <25
Grinding Media Loading(t) 7.5 20 22 22.5 28 32 43 50 55 80
Main Reducer ZD40 ZD60 ZD60 ZD60 ZD70
JDX560 JDX710 MBY800
Main Motor(kw) 95 250 280 315 400 500 630 710 800 1250
Weight(t) 29 46 54 76 98 107 124 148 162 215

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