Sustainable Mining and Metallurgy

By analyzing the influence of fuel type, air surplus coefficient, combustion temperature in furnace and boiler load rate on NO_x content in flue gas of reduction furnace and fuming furnace, this paper focused on the feasibility practice of reducing NO_x content in exhaust gas and generating economic benefits by controlling excess air coefficient and combustion temperature in furnace during slag release stage. The results showed that the NO_x content in flue gas decreased significantly and the effect of energy saving and emission reduction was obvious by implementing measures of reducing air, gas and carbon in slag discharge period. The oxygen consumption and fuel consumption of reduction furnace decreased month by month and tended to be stable. The motor of fuming furnace can save about 11250kWh of electricity per month, and the amount of denitration agent was greatly reduced, so the production cost was greatly reduced.