Rotary kiln for calcined petroleum coke calcining principle is the use of volatile molecules combustion and volatile components according to the share of fuel burning through the kiln than the spray nozzle into the right amount of asphalt, by adjusting the negative pressure to control the calcination kiln temperature and volatiles combustion, kiln temperature can be divided into four stages, namely: preheating zone, the combustion zone and cooling zone, combustion air is sucked from the kiln. Shen gray seal between the chamber and the kiln hood seal ineffective, it will cause a lot of air into the kiln and thus can not control the calcined raw material in the preheating zone of a large number of oxidation, increased destruction burning kiln structure. Negative pressure control and temperature distribution, the calcination temperature gradient showed peaks with steep type distribution, with shorter preheating, calcining kiln with the direction of the drift; vacuum suction from the kiln combustion air by more in the kiln cooling zone is consumption, a serious shortage of calcined with air, causing the calcination temperature do not increase, the cooling zone calcined material burning intensified, these defects resulting calcined material too volatile, affecting the quality of the electrode green body, also causing burning calcined material had large, forming a huge waste kiln heat balance throughout Nanjinrenyi, improved sealing and entry points in the kiln kiln burner nozzle. Please indicate Henan YuFeng Heavy Machinery (http://www.yufchina.com)