分解炉内不同CO2体积分数下的煤粉及煤焦还原NO特性

利用高温气固悬浮实验台对水泥行业中两种典型煤粉及一种煤焦在不同CO2体积分数的气氛下对NO的还原特性进行了实验研究,并考察了添加生料、石灰石及生料分解产物对煤焦及煤粉还原NO的影响特性.研究结果表明,气氛中CO2体积分数升高,煤焦及煤粉对NO的还原速率均增大,NO气体体积分数的谷值降低.水泥生料及石灰石对煤粉及煤焦还原NO的反应具有正催化作用;而水泥生料的分解产物对NO还原的正催化作用最强.随着气氛中CO2体积分数的升高,添加生料、石灰石及生料分解产物对煤焦及煤粉还原NO的促进作用相对减弱.

NO Reduction by Coal and Char at Different CO2 Concentrations in Cement Precalciner

The reduction of NO by two types of coal and one type of char at different CO2 concentrations in a suspen-sion reactor has been investigated in a high temperature gas solid reactor of industry precalciner.The effects of cement raw meal,limestone and the production of raw meal decomposition on the reduction of NO under different CO2 con-centrations were also discussed.The results show that,with the increase of CO2 concentration,the rates of NO re-duction by coal and char increase,while the valley value of NO concentration decreases.Cement raw meal,limestone and the production of raw meal decomposition have positive effect on the reduction of NO,and the produc-tion of raw meal decomposition shows the strongest catalytic activity.However,the catalytic activity of cement raw meal,limestone and the production of raw meal decomposition becomes weaker with the increase of CO2 concentra-tion.