O_2/CO_2气氛下木醋调质石灰石再燃/先进再燃脱硝性能研究  

Experimental study on reburning/advanced reburning performance of limestone modified by wood vinegar for NO reduction under O_2/CO_2 atmosphere

作　　者：刘洪涛[1] 韩奎华[1] 路春美[1] 李辉[1] 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《燃料化学学报》2013年第2期228-234,共7页Journal of Fuel Chemistry and Technology

基　　金：山东大学自主创新基金(2010TS020);山东大学研究生自主创新基金(yzc11058)

摘　　要：在O2/CO2气氛下利用沉降炉脱硝实验台,对木醋调质石灰石和醋酸钙的再燃/先进再燃脱硝特性以及氨气的选择性非催化还原脱硝特性进行了研究。结果表明,木醋调质石灰石和醋酸钙的再燃脱硝效率随温度的升高先提高后降低,1 323 K时获得最高脱硝效率分别为82.70%和78.52%;再燃脱硝氧浓度不宜过高,合适的再燃比为14%～17%,停留时间为0.8 s。氨气选择性非催化还原脱硝在1 173 K时获得最高脱硝效率为95.41%,温度窗口为1 142～1 335 K;随着氧浓度的增大,脱硝效率不断降低,反应适宜的氨氮比为1.5,停留时间为1.2 s。按氨氮比0.75向再燃区喷入氨气可显著提高木醋调质石灰石和醋酸钙的再燃脱硝效率,同时脱硝反应适宜的温度区间也得到显著拓宽,1 323 K时两者获得的先进再燃脱硝效率分别为93.49%和92.79%。NO reduction characteristics of reburning/advanced reburning using limestone modified by wood vinegar and calcium acetate, as well as selective non-catalytic reduction using ammonia, are investigated in a drop-tube system under O2/CO2 atmosphere. Results show that NO reduction efficiency of limestone modified by wood vinegar and calcium acetate through basic reburning increases first and then decreases with increasing temperature. The maximum NO reduction efficiency of 82.70% and 78.52% can be obtained at 1 323 K, respectively. High oxygen concentration is not conducive to NO reduction. The optimum reburning fuel fraction and residence time for basic reburning is 14% - 17% and 0.8 s, respectively. The maximum NO reduction efficiency of selective non-catalytic reduction is 95.41% at 1 173 K in temperature window of 1 142 - 1 335 K. With increasing oxygen concentration, NO reduction efficiency declines continuously. The optimum[NH3]/ [ NO ] molar ratio and residence time for selective non-catalytic reduction is 1.5 and 1.2 s, respectively NO reduction efficiency of reburning is significantly increased, while the reaction temperature window is obviously broaden when ammonia is injected into reburning zone at[ NH3] / [ NO ] mol ratio of 0.75. The maximum NO reduction efficiency of limestone modified by wood vinegar and calcium acetate advanced reburning is 93.49% and 92.79% at 1 323 K, respectively.

关 键 词：O2 CO2 木醋液 醋酸钙 先进再燃 NO 选择性非催化还原 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程] X511[环境科学与工程—环境工程]