大型燃气乙烯裂解炉燃烧过程的优化模拟  

Optimization Simulation of the Combustion Process for the Large Gas Ethylene Cracking Furnace

作　　者：陈东[1] 卫海桥[1] 王菁[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《石油学报（石油加工）》2012年第5期865-870,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究发展计划"973"计划(2009CB219905)资助

摘　　要：采用CFD-FLUENT软件建立了乙烯裂解炉炉膛模型,并按照裂解炉实际运行工况,将内燃机清洁燃烧概念,即富氧和烟气再循环引入到炉膛燃烧计算中,计算不同富氧率下燃料气体的放热量和不同烟气再循环率下NOx的分布。结果表明,使用烟气再循环可以有效降低NOx排放,但对燃料燃烧温度以及燃料燃尽率有影响,而利用富氧燃烧可以提高炉内燃料的燃烧放热量,但却增加NOx排放,而使得锅炉排放恶化;采用适宜的富氧率和烟气再循环率,可以达到节能减排的目的。A gas ethylene cracking furnace model was developed by using CFI）-FLUENT. According to the actual operating conditions, the clean-burning concept of internal combustion engine technology, including oxygen-enriched combustion and flue gas recirculation, was introduced, and the heat release and volume fraction distribution of NOx in ethylene cracking furnace were calculated. The results showed that the use of flue gas recirculation could reduce the NO~ emissions, but would affect the fuel combustion temperature and the fuel burn rate. Also the use of oxygen-enriched combustion could increase the heat release, but would increase the emissions of NOx. By using the appropriate rich oxygen rate and flue gas recirculation rate together, the purpose of energy saving and emission reduction could be achieved.

关 键 词：裂解炉 富氧燃烧 烟气再循环 

分 类 号：TK16[动力工程及工程热物理—热能工程]