Calculation of the emission of nitrogen oxides in electric resistance heating furnaces

Abstract

The present paper is devoted to the least studied topic in the field of use of modern electric heating equipment, namely, pollution of the atmosphere by nitrogen oxides and reduction of the intensity of this effect by coating furnace linings. Experimental and theoretical estimates of reduction of the emission of nitrogen oxides in electric furnaces with a lining with an intensifying refractory coating of the IVA-2 and IVAKS-2 types and an algorithm for calculating the emission of nitrogen oxides are presented. The plotted process of metal heating in an electric furnace shows that the use of IVA-2 and IVAKS-2 refractory coatings decreases the emission of nitrogen oxides by 22–28% both in a still oxidizing medium and under forced feeding of air into the heating zone. A method for calculating the characteristics of the process of emission of nitrogen oxides in electric furnaces is suggested. Results of the work can be, applied to heating and heat-treatment furnaces of forging and rolling mills, especially in environmentally vulnerable regions.