NO x reduction by coupling combustion with recycling flue gas in iron ore sintering process

A new process called 'NO (x) reduction by coupling combustion with recycling flue gas (RCCRF)' was proposed to decrease NO (x) emission during the iron ore sintering process. The simulation test of NO (x) reduction was performed over sintered ore and in the process of coke combustion. Experimentally, NO (x) reduction was also carried out by sintering pot test. For sintered ore, the amount of NO (x) emission is reduced by 15wt%-25wt% at 400-550A degrees C using 2.0vol% H-2 or 2.0vol% CO, or reduced by 10wt%-30wt% at 560-720A degrees C using 0.15vol% NH3. NO (x) 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 NO (x) reduction ratio is about 23wt% in coke combustion experiment and over 40wt% in sintering pot test.