What's the Finest Fineness of Coal Grinding Mill

The smaller the particle size of coal powder, the smaller the moisture content, the better its fluidity. However, if the particles of coal powder are too small or too dry, it will produce the phenomenon of coal self-flow, so that the working characteristics of coal mill is instability, bringing operation difficult to adjust the operation of the boiler. In addition, coal is oxidized by contact with oxygen, and coal powder may spontaneously combust under certain conditions. In the milling system, the coal is transported by the gas, gas and coal mixture meeting a spark will encounter the expansion of the fire source to produce greater pressure, resulting in the explosion of coal.

 

 

Therefore, in the preparation of coal equipment selection process we should pay attention to avoid possible risks and losses. Unqualified coal grinding mill produces coal powder with nonstandard size, will cause a lot of trouble later. The fineness of the pulverized coal used for the combustion of the boiler is determined by the following conditions: In the combustion aspect, it is desirable that the pulverized coal be finely pulverized, so that the air supply amount can be appropriately reduced to reduce the loss; From the milling system in the hope that some coarse coal powder, thereby reducing power consumption and consumption of pulverized coal. So in the choice of coal fineness, we  should make the sum of the loss smallest. It can be seen, for flammable coal or coal with high volatilization, or for grinding mill with uniform coal powder particles, and some boilers with enhanced combustion, the fineness of coal may be appropriately smaller, to save more coal energy consumption. As a result of different hardness of coal, its anti-wear ability is also different, so each economic fineness of coal is also different. 

 

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