Flue Gas Circulating Sintering Based on Biomass Fuel on Reduction of NO_x and SO₂ Emission

Abstract

In order to reduce the emission concentration of sintered flue gas pollutants, the source control technology and process control technology of iron ore sintering were adopted to reduce the emission concentration of flue gas pollutants. In this paper, the experiments of flue gas circulating sintering pot with charcoal instead of partial coke was carried out. The effects of O₂ content, temperature, SO₂ content and NO_x content in circulating flue gas on sinter properties and emission concentration of flue gas pollutants were studied. The experimental results show that the suitable oxygen content in flue gas was 14.9%, and the maximum suitable concentration of SO₂ was 500 ppm based on charcoal instead of 40% coke circulating flue gas sintering. The NO_x had little effect on the sintering performance index. Under the conditions of flue gas temperature of 200°C and CO content of 0.85%, the content of charcoal instead of coke was increased from 40% to 50%. The emission reduction of sintering flue gas pollutants SO₂ and NO_x was more than 42.6% and 65.8%, respectively. The comprehensive utilization of sintering flue gas waste heat and the cooperative control of sintering flue gas pollutants were realized.