• 关键词：解耦燃烧  烟气返回  焦炭  脱硝  铁矿烧结

• 基金项目：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)

• 陈彦广
• 1. 中国科学院过程工程研究所, 多相复杂系统国家重点实验室, 北京 100190; 2. 中国科学院研究生院, 北京 100039

• 王志
• 中国科学院过程工程研究所, 多相复杂系统国家重点实验室, 北京 100190

• 郭占成
• 1. 中国科学院过程工程研究所, 多相复杂系统国家重点实验室, 北京 100190; 2. 北京科技大学, 循环与生态冶金教育部重点实验室, 北京 100083

• 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NO_x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NO_x排放降低10%左右,烟气返回到焦炭燃烧过程可使NO_x的排放降低15%,耦合燃烧和烟气返回结合可使NO_x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,NO_x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NO_x的排放.

• Abstract：The reduction of NO_x 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 NO_x reduction rate is about 10% in the coupling combustion of pyrolysis gas and coke,while the NO_x reduction rate is about 15% when flue gas is recycled into the coke combustion.In addition,the NO_x reduction rate is over 20% when the flue gas is recycled into the coupling combustion of pyrolysis gas and coke.The NO_x reduction rate increases from 23% to 40% as the height of coke layer increases from 150 mm to 300 mm.NO_x emissions in the iron ore sintering process can be effectively reduced in the new denitrification technique with decoupling combustion and flue gas recycling.

• Key words：decoupling combustion  flue gas recycling  coke,denitrification  iron ore sintering process

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