China's coal resources distributed more widely in different regions are different varieties of coal, but also determines the amount of elements contained in the coal is not the same. However, the rotary kiln the material requires a certain amount of heat, according to the temperature required for different materials is not the same, the different coal combustion heat generated in the different values, in order to achieve the desired calcination temperature, so the choice of coal powder, it requires no standards. Through a long experience, this standard has four aspects : volatile matter, ash, moisture, sulfur, its detailed explanation below. 1, the volatiles. coal combustion, volatile first precipitation after burning heat, promote combustion of carbon particles, help to improve the speed and complete combustion of pulverized coal combustion , which generally requires coal volatile than 15%; other hand, when the volatile content is too high, it will affect the safe operation of coal preparation system, therefore, the general requirements of coal volatile than 25%. 2, ash. Generally require less than 10% of coal ash, ash melting point greater than 1250 ℃. 3, water. Will become pulverized coal, milling equipment needs to be processed, different milling equipment for coal moisture requirements are different, ball mill for coal moisture requirement is not more than 12%, Raymond mill for coal moisture requirement is not more than 8%. If the raw water exceeds the specified range, will be dried before milling equipment pre-drying, during milling process. 4, the sulfur. Calcined lime, sulfur in the coal is partially transferred to the lime, if the sulfur in the coal is too large, will cause the sulfur content of the lime becomes large. If the calcination of lime used in metallurgy use, will affect the cost of desulfurization metallurgy. Therefore, the choice of coal, generally requires less than 0.8% sulfur. Professional production of rotary kiln, Henan YuFeng Heavy Equipment: The main products are: lime kiln, rotary kiln, ceramic sand | sand rotary kiln, rotary kiln calcium aluminate powder, laterite nickel ore rotary kiln, rotary kiln magnesium, zinc oxide rotary kiln, rotary kiln bauxite, petroleum proppant rotary kiln, rotary kiln, disc granulator, wind swept coal mill, ball mill, preheater, burners, coolers, etc.. Welcome new and old customers to our company to negotiate! Reproduced please specify Henan YuFeng Heavy Machinery