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Coal Mill

Coal Mill

Introduction:Coal mill, also named as coal grinding mill, is the main equipment of the rotary kiln cement clinker production system and at the same time. It is also used to grind and dry coal with various hardnesses.

Coal Mill Overview

Coal mill, also named as coal grinding mill, is the main equipment of the rotary kiln cement clinker production system and at the same time. It is also used to grind and dry coal with various hardnesses. Coal powder kiln is mainly composed of feeding device, main bearing, rotating part, gear, discharging equipment, high-voltage start-up device and lubrication system. Coal mill is widely used in industries including cement, power generation, metallurgy industry, chemical industry, etc., with reasonable structure and high grinding efficiency; it is the ideal equipment for coal preparation.

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. Compared with rock grinder (stone flour mill), the coal mill we make is with reasonable structure, high grinding efficiency and is the ideal equipment for coal processing.


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 (stone flour mill), the coal mill we make is with reasonable structure, high grinding efficiency and is the ideal equipment for coal processing.

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.

Working principle of coal mill

When the coal mill or coal crusher works, materials are fed by the feed device to the charging equipment of the coal mill and at the same time the hot air with the temperature of 300 degree will enter the charging device via the blast pipe. In the drying cabin there is a specially made lifting blade which can raise the raw coal to be dried with the exchange of heat. The dried materials enter the powder grinding cabin through the double layer separating board. There is a grinding body (a steel ball) installed in the cabin and the coal briquette will be crushed and ground to powder. Then the specialized induced draft fan will bring the crushed coal powder and air out from the coal mill via the discharging device and the coarse particles will return to the powder grinding cabin through the reverting spiral device for deep grinding.

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