Sustainable Mining and Metallurgy

This paper took the coke oven flue gas of a coking plant in Tangshan as the object, explored the characteristics of coke oven flue gas, compared the current coke oven flue gas dust removal, desulfurization and denitrification technology, and finally selected the appropriate desulfurization and denitrification technology. The concentration of SO₂ in the coke oven flue gas of the coking plant was as high as 2000mg/Nm³, the NO_x content was lower than that of the conventional coke oven flue gas, and the flue gas temperature was low, which was 180~192℃. According to the characteristics of flue gas, the CFB semi-dry desulfurization and dust removal + secondary combustion SCR denitrification combined process was selected as the desulfurization and denitrification technology route, and the process principles of the two technologies were introduced. After using this process, the concentration of SO₂ in the outlet flue gas is less than 35mg/Nm³, the concentration of NO_x is less than 30mg/Nm3, and the dust emission is less than 5mg/Nm³. The parameters are better than the latest local coke oven emission standards, and the ultra-clean emissions of SO₂, NO_x and dust are realized.