NO_x reduction by coupling combustion with recycling flue gas in iron ore sintering process

Yan-guang Chen1),Zhan-cheng Guo2),and Gen-sheng Feng2) 1) School of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing 163318,China 2) Key Laboratory of the Ministry of Education of China for Recycling & Ecological Metallurgy,University of Science and Technology Beijing,Beijing 100083,China

摘 要：A new process called’NOx reduction by coupling combustion with recycling flue gas（RCCRF）’was proposed to decrease NOx emission during the iron ore sintering process.The simulation test of NOx reduction was performed over sintered ore and in the process of coke combustion.Experimentally,NOx reduction was also carried out by sintering pot test.For sintered ore,the amount of NOx emission is reduced by 15wt%-25wt% at 400-550oC using 2.0vol% H2 or 2.0vol% CO,or reduced by 10wt%-30wt% at 560-720oC using 0.15vol% NH3.NOx reduction is around 10wt% by coupling combustion of pyrolysis gas and coke,or around 16wt% by recycling flue gas into coke combustion.By RCCRF,the maximum NOx reduction ratio is about 23wt% in coke combustion experiment and over 40wt% in sintering pot test.

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