Coal is an object that can burn, burn it if it reaches the qualifications, naturally occurring fire or greater security incidents. Throughout the rotary kiln production

process, coal grinding system security incidents occur that is natural and coal explosion two cases. The first coal and natural. Large quantities of coal are the

stockpile storage, when in contact with air, the coal will be some oxidation reaction, but faster than the thermal diffusion rate of the oxidation time, there will be a

natural phenomenon of coal. Mill in operation or stopped, the system prone to certain natural coal deposits. When the accumulation of coal when the temperature

reaches 120 ~ 150 ℃ is happening naturally, so to control the temperature, the temperature should be controlled below 60 ℃ safer. The second explosion of coal.

Want explosive coal dust must have certain conditions before they can, through a large number of coal dust explosion accident analysis concluded that there are

four main factors which led to the coal dust explosion. 1, the fineness of pulverized coal, but coal fineness fine enough , when the surface of coal is increased, and

this time pulverized coal and air mixture is more fully, once ignited, the burning speed will spread rapidly This is a prerequisite for an explosion occurred. 2, if the

gas concentration of the pulverized coal within the limits of the explosion, will also cause an explosion. generally believed that, under standard conditions the

concentration of the gas mixture of pulverized coal explosion limit range of 150 ~ 1500g / m³, because different substances contained in coal, the explosion limit

will change, if the gas concentration is below the limit of the range of 0 ~ 150g / m³, this is not considered the range of coal grinding because it requires too much

air, so in order to install, only the limit range above. 3, the object needs to have sufficient oxygen combustion can, coal dust explosions, too, if the oxygen-

containing gas is too high, which is one of the factors that led to an explosion. So try to control the oxygen content of the gas below 14%. 4, ignition source is

present, there is sufficient thermal environment sufficient to ignite, such as coal for natural gas drying excessive heat, overheating of machine parts, electrical

equipment, sparks and static electricity. Tells us a lot of practice, these factors above, as long as there is any one in production is controlled, can reduce the

possibility of explosion, but in order to the production of safer, these factors control in two or more. Please indicate Henan YuFeng Heavy Machinery