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Coal is a readily combustible black or brownish-black sedimentaryrock normally occurring in rock strata in layers or veins called coalbeds or coal seams .Coal, a fossil fuel, is the largest source ofenergy for the generation of electricity worldwid?

Coal mill is important auxiliary equipment for coal-powder boiler, and it has three methods to crush the coal briquette and grind them into a pulverized coal, like crushing, impacting and grinding. The goal of coal mining is to remove coal from theground.There are four main types of coal mines: shaft mine, slope mine, drift mine, and surface (open-cast) mine. coal mining is need crusheror moible crusher, include some optional equipment such as vibratingfeeder, vibrating screen, belt conveyors and so on to finish the coal milling process.

The vertical coal mill mainly consists of the powder classifier, rollers device, millstones device, compressing device, speed reducer, motor and the shell part. The separator is an energy-saving powder-classification device with high efficiency. The roller is used to grind and crush the materials. The millstone is fixed on the output shaft of the speed reducer where the mill roller grinds the material. The compressing device is the part that provides the grinding force sufficient to crush the material.

Air swept coal mill is a new device introduced international advanced technology. And it is the main equipment in cement plant for both drying and grinding powder. Compared with the ordinary ball mill, it has advantages of larger capacity, finer particle and bigger specific surface. Therefore, it is ideal equipment for pulverized coal preparation.rotary kiln:http://www.crusher-machine.com/28.html
raymond mill:http://www.crusher-machine.com/13.html

It mainly consists of the feeding device, main bearing, rotary part, driving device, discharging device, high pressure starting device and lubricating system. When the raw materials are conveyed into mill by feeding device, and through wind pipe, the heat wind enters in; they will exchange the heat fully along the barrel rotation. And then, the coal will be crushed and grinded, at the same time, with the heat wind, the powder will be out by discharging device.

Vertical coal mill also called coal grinder is the most used machine for coal grinding according to our mining experience.Raymond mill is also the early coal mill, the capacity of this coal mill can be upto 6-8 t/p.Ball grinding mill is the early coal mill used in coalpowder plant, there are two types, wet ball mill and dry ball mill.

Raw coal is fed through a central coal inlet at the top of thepulverizer and falls by gravity to the rotating grinding table, mixingwith classifier rejects returned for re-grinding.Centrifugal actionforces the coal outward to the grinding ring where it is pulverizedbetween the ring and three grinding rollers.

Specialized for the high production of superfine pyrophyllite powder making in glass fiber industry Specialized for the high production of gangue powder making in coal industry. Specialized for the high production of various of chemical raw material powder making in the chemical industry. It is a necessary equipment for the high production of mineral powder in the non-mental mine industry and large scale powder making in many other industries