1, in the firing zone, dicalcium silicate to form calcium oxide absorption process of tricalcium silicate, the chemical reaction heat effect substantially equal to zero (slightly endothermic reaction), the liquid phase is generated only a small amount of net heat fusion, However, to make the absorption of free calcium oxide was more completely, and make clinker mineral crystals are well developed, high-quality clinker, so that the material must maintain a certain temperature and sufficient residence time. 2, in the decomposition zone, the decomposition of calcium carbonate to absorb a lot of heat, but the kiln heat transfer rate is very low, and the material with the movement in the decomposition speed very quickly, have a shorter residence time, which is affecting the rotary kiln One of the main contradiction clinker. In the decomposition lap band plus backgauge is to alleviate this contradiction one of the measures taken. 3, lower heat consumption theory, reduce exhaust away cylinder surface heat loss and heat loss, reduce or change the wet slurry moisture to dry, etc., is to reduce the heat consumption of clinker to improve the thermal efficiency of the kiln the main way. 4, to improve the heat transfer capacity of the kiln by the rotary kiln system, the heat transfer area and heat transfer limitations, such as increased air temperature so as to increase the heat transfer rate, the kiln can be increased, but the corresponding increase in the exhaust gas temperature, the cooked material specific heat consumption actually increased for certain specifications kiln, under certain conditions, there is a thermal output of the economy on the range. 5, the rotary kiln calcined (raw material preheating and decomposition) capabilities and sintering (clinker) there was a contradiction between the ability, or the kiln heating (fuel to generate heat) and heat capacity (heat to materials) there was a contradiction between the ability, and that this contradiction with increasing kiln specifications become more prominent. Theoretical analysis and actual production statistics show that the heat capacity of the kiln and the kiln is proportional to the cube of the diameter, while the heat transfer capacity of the kiln diameter 2-2.5 substantially proportional to the square, so the greater the specifications of the kiln, The lower the yield per unit volume of the kiln, the kiln in order to increase the heat transfer capacity, must increase the heat transfer area of ​​the kiln system, or change the material and heat transfer between the airflow, precalciner are effective measures to resolve this contradiction. Please indicate Henan YuFeng Heavy Machinery