超细煤粉分级燃烧中NO_x还原规律的研究  

RESEARCH ON THE RULE OF NO_X REDUCTION IN THE MICRONIZED COAL REBURNING

作　　者：金晶[1] 张忠孝[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《工程热物理学报》2006年第4期699-701,共3页Journal of Engineering Thermophysics

基　　金：国家"863"高技术项目资助(NO.2002AA527054)校博士启动基金项目资助(NO.X 619)

摘　　要：煤粉再燃技术脱氮效率高而运行费用低,是最行之有效的低NOx燃烧技术之一。通过模拟计算与试验方法, 对一维热态煤粉炉内超细煤粉分级燃烧Nox的还原规律进行了研究。研究结果表明:再燃燃料越细,对NOx的还原作用越强,最佳再燃燃料粒度为20μm;在相同NOx还原率的情况下,随着再燃燃料粒度的减小,需要的再燃燃料比例减小,再燃区停留时间缩短。以超细煤粉作为再燃燃料不仅使燃烧效率提高,而且对NOx的还原效率也相应提高,达70％左右。Coal reburning technology is one of the most promiseful methods, with high NOx reduction efficiency and low operation cost. The numerical simulation and experimental study on the rule of the NOx reduction in the micronized coal reburning has been done. The results of this study indicated that NOx reduction efficiency increasing with the particle size of reburning fuel reducing. The optimum particle size of reburning fuel is 20μm. The small particle size of reburning fuel, the lower reburning fuel load is needed for uniform reduction efficiency. It is propitious to reducing NOx emissions with the residence time in rich zone increasing, but the effect is not obvious with the residence time farther increasing. The finer the reburning fuel is, the shorter the residence time is needed. Compared with conventional coal reburning, micronized coal reburning is superior not only in raising combustion efficiency but also in further reducing NOx emissions by over 10%. NOx reduction efficiency reaching about 70%.

关 键 词：煤粉再燃 NOx 煤粉粒度 还原率 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]