关键词: 水泥;回转窑;数值模拟;NO;温度

Abstract: In order to study the variation laws of NOx concentrations and temperatures in cement rotary kilns,combustion processes of pulverized coals were simulated inside them.Meanwhile,the results were relatively consistent with monitoring data.The study results indicate that the NOx concentrations are respectively 0,100-1300 mg/m3,200-1300 mg/m3,100-1000 mg/m3 and the temperatures are respectively 1100-1300 K,1400-1900 K,1600-1750 K,1300～1700 K in cooling zones,sintering zones,transition zones and outlet when pulverized coals are 0.5-1.0 times of primary airs.What's more,the condition which pulverized coals are injected as 0.6-0.8 times of primary airs is relatively suited for actual cement technologies,because the NOx concentration is lower and the temperature is higher than other conditions in the cement rotary kiln.

Key words: cement;rotary kiln;numerical simulation;NO;temperature