Effects of Processing Parameters on Fuel NO_x in the Sintering Process

Effects of processing parameters on emission concentration of the fuel NO_x in the sintering process were investigated using tube furnace.The results show that the average concentration of fuel NO_x increases first and then decreases with increasing the sintering temperature,reaching a maximum with the sintering temperature approximately at 1 100 ℃.As the holding time of high temperature and heating rate increase,the average concentration of fuel NO_x decreases from 87 mg/m³ and 91 mg/m³ to 77 mg/m³ and 80 mg/m³,respectively.When the oxygen content is lower than 21%,the average concentration of fuel NO_x has positive correlations with the oxygen content in the sintering process.The emission concentration of fuel NO_x mainly depends on the formation and reduction of NO_x in sintering process.Therefore,in the sintering process,the formation of NO_x can be inhibited or reduced by controlling sintering temperature,increasing heating rate,prolonging high temperature time or decreasing oxygen content,then the discharge amount of NO_x in the sintering flue gas can be reduced.