Cement kilns now are two major categories, one is kiln shell in horizontal (slight slope), and can be called rotary kiln rotary movement (also known as rotary kiln); another vertical kiln shell is set called non-rotating shaft also called vertical kiln. China currently has two types of kilns used: Normal shaft and mechanical shaft kiln. Ordinary kiln is artificial feeding and artificial discharge or mechanical feeding, artificial discharge; mechanical shaft mechanical feeding and mechanical unloading. Mechanical shaft kiln is a continuous operation, its production, quality and high labor productivity than normal kiln. Calcining kiln and kiln features contrast: rotary kiln high yield than the world now has the Nissan 2200 tons of lime kiln production; abroad Nissan has built a lot of 150 to 300 tons of lime kiln equipment, operating conditions good; kiln daily output of 45 tons. Rotary kiln preheater and coolers necessary to effectively adjust the firing temperature, the lower fuel consumption; shaft when the calcination material to uniformly mixed with the coal, the combustion air through the drum to the waist into the ground or, in shaft within the convective heat transfer is mainly pellet heat conduction inside there. Although the kiln burning zone temperature is higher, there is a large number of Co2 and steam, but the gas very small thickness. Rotary kiln heat exchanger analysis: rotary kiln and kiln burning pulverized coal in different situations. Rotary kiln is the upper space in the material, constantly burning coal and other ways of radiation convection heat to the material, almost independent of the raw meal reaction occurs. The kiln is different, it uses fuel and raw materials are mixed together into a ball into the kiln burning fuel in close contact with the material in the clinker calcining zone is the main way to spread heat, followed by convective heat In times of radiation heat transfer, coincided with the rotary kiln burning zone of the heat transfer in the form opposite, kiln airflow preheating zone is the convective heat transfer to the surface of the material mainly clinker cooling zone is the convective heat transfer surface to the air flow based. Kiln chimney or exhaust ventilation is by machine, the gas flow direction is from the kiln to kiln flow, firing back with a high oxygen content than. Rely on the lower shaft and the side portion of the blower fan, from the bottom upwards, firing with a low oxygen content. Kiln material filling ratio is small, airy space, small resistance, smooth ventilation, coal burning completely, calcined easy to control. Kilns kiln chat ball filled the entire space, resistance, uneven ventilation, ventilation affected the upper part of the kiln less oxygen, so that volatile matter can not be discharged on fire, causing heat loss affect fuel combustion pass heat. Please indicate Henan YuFeng Heavy Machinery (http://www.yufchina.com)