Coal grinding station main production equipment include: coal mill, coal transportation equipment, unloading equipment, dispensing equipment. pulverized coal mill system is the core of the coal grinding station.

However, due to the characteristics of explosive coal dust, and the fineness requirements, a lot of coal grinding plants their technical requirements are higher during the coal preparation.

Chaeng (Great Wall Machinery Co., Ltd)as a domestic first-class grinding system integration provider committed to the research and production of coal preparation systems over the years, Chaeng coal preparation systems project engineer for us a detailed introduction.

1.coal fineness of coal grinding plants must be guaranteed

For power plants in terms of pulverized coal boiler, coal fineness not only affect the operation of the larger economy, but also have an important impact on the safe operation of boilers, especially those burning lean coal and anthracite boiler even more so. If coarse pulverized coal, it can easily lead to fire boilers, coking, high-temperature corrosion, Reheater Tube Explosion, combustion efficiency and low wear and tail heating surface a series of questions.

Only the finer coal,which can catch fire and burn rapidly, the smaller the loss of incomplete combustion boiler, a corresponding order to improve the efficiency of the boiler (if the boiler is maintained at the fineness of pulverized coal economy running, each 600MW boiler can save Billions of tonnes per year coal).

2. coal grinding plants must use a variety of measures to prevent explosions in coal preparation process

In the grinding system, pulverized coal is transported by a gas, gas powder mixture is likely to encounter a spark caused an explosion pulverized coal. In a closed system, the pressure generated when coal dust explosion up to 0.35MPa, so in the event of an explosion, the consequences are very serious.

So, how to prevent it?

(1). the higher the temperature of the gas mixture powder, the more explosive. So pulverizing system operation should strictly control the mill outlet gas temperature of the powder mixture. The water is often reflected in the coal mill outlet air temperature, in actual operation, the coal mill outlet air temperature should be selected according to the different powder mixture of coal.

(2). the pulverized coal pulverizing system should be installed in a conduit , which have a certain inclination angle, trying not horizontal pipe, no dead ends, the flow rate of gas powder mixture should not be too low, in pulverized coal pipeline, reduce throttle deposited to prevent the accumulation of pulverized coal spontaneous combustion caused the explosion.