选择性非催化还原法在电站锅炉上的应用  

Application of Selective Non-catalytic Reduction on a Power Plant Boiler

作　　者：吕洪坤[1] 杨卫娟[1] 周志军[1] 黄镇宇[1] 刘建忠[1] 周俊虎[1] 岑可法[1] 

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027

出　　处：《中国电机工程学报》2008年第23期14-19,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(2006CB200303);新世纪优秀人才支持计划项目(NCET-04-0533)~~

摘　　要：对一台HG-410／9．8-YW15型煤粉锅炉，在已进行常规煤粉再燃改造基础上进一步结合了选择性非催化还原（selective non—catalytic reduction，SNCR）的改造，即对该锅炉采用了联合Reburning／SNCR技术。通过实验运行表明：当仅有再燃投入运行时，NOx可以低于350mg／m^3（标准状态，6％O2，干烟气）；而当结合了SNCR运行时，NOx则达到了200mg／m^3以下，同时尾部氨泄漏小于7．6mg／m^2。低负荷情况下脱硝率较高，对于51％负荷（φNH3）／φNO）等于1．0），NOx降至160mg/m^3，而此时的尾部氨泄漏只有1．14mg/m^3。此外，根据负荷及φ（NH3）／φ（NO）的不同，单独SNCR技术在再燃的基础上也实现了38．2％-73．9％的脱硝率。尾部烟道中的氨分布呈现出前墙高于后墙的现象。SNCR的投运对飞灰含碳量、排烟温度及CO排放等几乎没有影响，但会造成尾部排烟量的增加，即对锅炉效率造成了约0．5％的损失。Selective non-catalytic reduction（SNCR） was applied to a HG-410/9.8-YW15 boiler on the base of conventional pulverized-coal reburning process which had been implemented before. The experimental data showed that NOx could be 350 mg/m^3（standard condition, 6%O2, dry gas） below under reburning only and 200 mg/m^3 below under hybrid reburning/SNCR with NH3 slip lower than 7.6 mg/m^3.NOx reduction was much higher when SNCR operated at low load. When setting φ（NH3）/φ（NO） to 1.0,NOx reached 160 mg/m^3 at 51% boiler load,and the NH3 slip was only 1.14 mg/m^3.Further more, SNCR alone could achieved about 38.6% to 73.9% NOx reduction efficiency on the base of reburning at experimental loads. The NH3 slip around front wall was larger than that around back wall at the section of tail flue.The application of SNCR had almost no impact on unburned carbon, exit gas temperature and CO emission, but the amount of exit flue gas would be increased. So, there was a boiler efficiency loss of about 0.5% under the experimental conditions.

关 键 词：选择性非催化还原 再燃 尿素 NOx 氨 

分 类 号：X511[环境科学与工程—环境工程]