significant influence on the combustion. It is very important to fineness. Pulverized coal fineness of any change, fracturing proppant will change the furnace condition. So the coal fineness must be strictly controlled. Hair too coarse pulverized coal, resulting in part of coarse grain cannot be burned in the combustion zone, thus make the temperature of the combustion zone couldn't get on. In addition, coal humidity and important exceptions, if moisture content is too high, cause the evaporation of heat consumption, thus affecting the furnace combustion conditions. Pulverized coal burner to a second combustion within the duct into the combustion zone. Kiln operators have been point, is minimal or no air, can use a higher calorific value of the secondary air to burn. Heavy oil: using heavy oil as fuel, should first atomized into small droplets, it makes it easy to with oxygen burning, so difficult to use, at the same time its use cost is higher than the natural gas and coal. Look from all aspects, proppant sand manufacturers should not be bilge ceramsite burning fuel.
Pulverized coal preparation, because our country ceramsite calcined rotary kiln at present most used coal as fuel, so the emphasis to introduce the preparation of pulverized coal and coal. The current domestic large and medium-sized ceramsite factory of pulverized coal preparation most USES wind sweep type ball mill, ATOX vertical mill, etc. The moisture content is not more than 12% of the crushed coal (diameter < 20 mm) directly into the dry grinding fine, hot air temperature is below 300 degrees from vertical cooling machine or ceramsite sand kiln kiln activities on introduction, the mill of hot air and pulverized coal (80 ~ 100 degrees) by the cyclone separator pulverized coal discharge into the intermediate storehouse, exhaust gas (including coal) is introduced into a draught fan, along with the middle under-bin feeding measurement of pulverized coal into the furnace together. The system functions well and fine grinding (drying), using ceramsite waste heat, environmental protection, good (no dust exhaust emissions), but the investment is big, is suitable for the annual output of more than 5 x 104 m3 of ceramsite production line.
