工业可燃废气再燃低NO_(x)排放实验研究及工程应用  

Experimental Study and Its Application of Low NO_(x) Emission Using Combustible Exhaust-gas Reburning

作　　者：贾彦兵 周托 王志宁 郭学茂[4] 黄中[2] 蔡晋 JIA Yanbing;ZHOU Tuo;WANG Zhining;GUO Xuemao;HUANG Zhong;CAI Jin(Guodian Power Development Company Limited, 100101 Beijing, China;Department of Energy and Power Engineering, Tsinghua University, 100084 Beijing, China;Shanxi Research Institute for Clean Energy, Tsinghua University, 030032 Taiyuan, China;Taiyuan Boiler Group Company Limited, 030032 Taiyuan, China)

机构地区：[1]国电电力发展股份有限公司,北京100101 [2]清华大学能源与动力工程系,北京100084 [3]清华大学山西清洁能源研究院,太原030032 [4]太原锅炉集团有限公司,太原030032

出　　处：《煤炭转化》2022年第3期80-86,共7页Coal Conversion

基　　金：太原市“揭榜挂帅”项目.

摘　　要：为利用工业可燃废气降低锅炉NO_(x)原始排放质量浓度,通过建立高温管式炉再燃实验台,研究了工业可燃废气再燃过程中主燃区过量空气系数(0.9,1.0,1.1,1.2,1.3)、主燃区停留时间(0.6 s,0.8 s,1.0 s,1.2 s,1.4 s)、再燃燃料热量比例(0%,5%,10%,15%,20%)、再燃区温度(1573 K,1623 K,1673 K,1723 K,1773 K)和再燃区停留时间(0.2 s,0.4 s,0.6 s,0.8 s,1.0 s)对NO_(x)排放的影响。结果表明:优化主燃区过量空气系数、延长再燃区停留时间、增加再燃燃料热量比例及提高再燃区温度均可以有效增强再燃降低NO_(x)排放的效果;在主燃区过量空气系数为1.0、再燃区停留时间为0.8 s、再燃燃料热量比例为15%及再燃区温度为1773 K条件下,最高脱氮率达到35%。通过对130 t/h锅炉进行改造,在工业可燃废气再燃的条件下,炉内NO_(x)排放质量浓度比改造前降低了29.8%,取得了良好的运行效果。The original NO_(x) emission can be reduced by injection of combustible exhaust-gas into the boiler furnace.In this work,a high-temperature tube furnace system with exhaust-gas reburning was established to study the influence of some key factors on the NO_(x) emission,involving excess air coefficient in the primary combustion zone(0.9,1.0,1.1,1.2,1.3),residence time of gas in the primary combustion zone(0.6 s,0.8 s,1.0 s,1.2 s,1.4 s),blending ratio of reburning fuel based on the heating value(0%,5%,10%,15%,20%),temperature in the reburning zone(1573 K,1623 K,1673 K,1723 K,1773 K),and residence time of gas in the reburning zone(0.2 s,0.4 s,0.6 s,0.8 s,1.0 s).Results show that the NO_(x) emission can be effectively reduced by optimizing the excess air coefficient of the primary combustion zone,extending the gas residence time in the reburning zone,increasing the blending ratio of reburning fuel,and increasing the temperature of the reburning zone.For instance,when the excess air coefficient in the primary combustion zone is 1.0,the gas residence time in the reburning zone is 0.8 s,the blending ratio of reburning fuel is 15%,and the temperature of the reburning zone is 1773 K,the denitrification rate can reach up to 35%.In addition,one 130 t/h boiler was technically reformed based on the findings of this study,the NO_(x) emission has been reduced by 29.8%by reburning of the combustible exhaust-gas,and the operation state is satisfactory.

关 键 词：再燃脱硝 可燃废气 主燃区 再燃区 锅炉改造 氮氧化物 

分 类 号：TK16[动力工程及工程热物理—热能工程]