O_2/CO_2气氛下混煤燃烧过程中NO_x排放特性  

NO_x emission characteristics of blended coal combustion in O_2/CO_2 atmosphere

作　　者：张永春[1] 张军[1] 刘杨先[1] 赵亮[1] 谢芳[1] 陈洁[1] 盛昌栋[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2010年第5期992-996,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金国际合作交流项目(507211460649);华中科技大学煤燃烧国家重点实验室开放基金资助项目(200502)

摘　　要：在滴管炉上对无烟煤、烟煤及其混煤在O2/CO2气氛下燃烧时的NOx排放特性进行了研究,重点分析了燃烧气氛、温度、氧浓度、掺混比例等对NOx排放浓度及氮转化率的影响.实验结果表明,较之O2/N2气氛下,无烟煤与烟煤在O2/CO2气氛下混烧时NO排放浓度平均低大约12%;随O2体积分数增加,NO排放浓度仅小幅增加;随混煤中无烟煤所占比例的增加,NO排放浓度先减小后增加,当无烟煤/烟煤比例为1∶1时,其达到最小值;混煤的氮转化率随混煤中无烟煤比例的增加而逐渐减小.混煤的氮转化率与掺混比例有较大的关联,但并非简单的线性关系.NOx emission characteristics of blended coal（anthracite and bituminous） combustion in O2/CO2 atmosphere were investigated in a drop tube furnace.The study focuses on the effects of atmospheres,temperature,O2 concentration and mixing ratio on NOx emission concentration and nitrogen conversion ratio.The results show that on an average the NO emission concentration in O2/CO2 atmosphere is about 12% lower than that in O2/N2 atmosphere and only slightly increases with O2 concentration.With the increase of anthracite ratio the NO emission concentration decreases first and then increases,and reaches the minimum value at the mixing ratio of 1∶1.The nitrogen conversion ratio decreases with the increase of anthracite ratio.Nitrogen conversion ratio has a close relation with the mixing ratio,but it＇s not a simple linear relationship.

关 键 词：O2/CO2气氛 混煤 NO排放 掺混比例 

分 类 号：TQ534.9[化学工程—煤化学工程]