摘要
通过模拟烧结过程中焦炭的分布,研究了返回烟气、热解气主要组分与焦炭耦合燃烧降低NOx排放的规律.结果表明,热解气主要组分与焦炭耦合燃烧可使NOx排放降低10%左右,烟气返回到焦炭燃烧过程可使NOx的排放降低15%,耦合燃烧和烟气返回结合可使NOx的排放降低20%以上.在新工艺过程中,焦炭层厚度由150mm增大到300mm时,NOx排放的降低率由23%增大到40%.烧结过程解耦耦合燃烧与烟气返回脱硝工艺可有效减少NOx的排放.
The reduction of NOx in the coupling combustion of recycled flue gas,by the major components of pyrolysis gas and coke was investigated based on a simulated coke distribution in the iron ore sintering process.The results show that the NOx reduction rate is about 10% in the coupling combustion of pyrolysis gas and coke,while the NOx reduction rate is about 15% when flue gas is recycled into the coke combustion.In addition,the NOx reduction rate is over 20% when the flue gas is recycled into the coupling combustion of pyrolysis gas and coke.The NOx reduction rate increases from 23% to 40% as the height of coke layer increases from 150 mm to 300 mm.NOx emissions in the iron ore sintering process can be effectively reduced in the new denitrification technique with decoupling combustion and flue gas recycling.
出处
《环境科学学报》
CAS
CSCD
北大核心
2008年第9期1727-1732,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金资助项目(No.50574085)
中国科学院知识创新工程青年人才领域前沿项目(No.O82809)~~
关键词
解耦燃烧
烟气返回
焦炭
脱硝
铁矿烧结
decoupling combustion
flue gas recycling
coke,denitrification
iron ore sintering process
