Numerical Simulation of Selective Non-Catalytic Reduction Denitrification Process in Precalciner and the Effect of Natural Gas Injection on Denitrification

Cement production is the third largest source of nitrogen oxides (NOx), an air pollutant that poses a serious threat to natural environment and human health. Reducing NOx emissions from cement has become urgent issue. This paper aims explore investigate more efficient denitrification processes be applied in reduction precalciner. In this study, firstly, flow field, temperature component fraction precalciner are studied analyzed using numerical simulation methods. Based on this, influence reductant injection height amount SNCR was by simulating selective non-catalytic (SNCR) process The effect gas also investigated. results showed that, with increase height, concentration decreased, then increased, increased again. final at exit position 531.33 ppm. process, should injected area where 26–30 m so can fully react avoid ammonia escape. NSR represents ratio NOx, show larger is, higher rate is. However, as approaches 2, slows down escape starts increase. Therefore, according results, kept between 1 1.6. reached maximum value 42.62% optimal condition 26 1.6 NSR. Co-firing pulverized coal effectively reduce generation furnace. 32.15% when 10%. co-combustion combined better than or denitrification. Under 10%, 29.83% 31.64% compared SNCR-only co-combustion-only denitrification, reaching 61.98%, respectively. Moreover, less used co-denitrification, problem excessive avoided. study provide useful guidance for development production.