超低排放改造后SCR出口NO_x分布及逃逸氨浓度评估研究  

Assessment of NO_x Distribution and Ammonia Escape Concentration at SCR Outlet after Ultra-Low Emission Retrofit

作　　者：马大卫[1] 张其良[1] 黄齐顺[1] 查智明[1] 何军[1] 

机构地区：[1]国网安徽省电力公司电力科学研究院,安徽合肥230601

出　　处：《中国电力》2017年第5期168-171,共4页Electric Power

基　　金：安徽新力电业科技咨询有限责任公司项目(2015-HB-05)~~

摘　　要：选取安徽省内一台660 MW超超临界机组,对其超低排放改造后SCR脱硝出口NO_x分布及逃逸氨浓度进行研究,主要测试反应器出口烟气逃逸氨、NO_x浓度、氧量和温度等。结果发现改造后机组的脱硝出口NO_x分布严重不均,逃逸氨浓度超过设计值,标准状态脱硝出口逃逸氨浓度高区域的NO_x浓度相对较低,脱硝效率相对较高。局部点位因催化剂严重吹损导致逃逸氨浓度高,NO_x浓度也较高。测试结果表明经改造后的机组需进行喷氨优化试验和烟道流场模拟试验,以改善SCR脱硝装置运行效果和提高脱硝运行的经济性。This paper takes a 660-MW uhra-supercritical unit for example to study the NOx distribution and ammonia slip concentration at the SCR denitration outlets after the ultra-low emission retrofit project. The ammonia slip concentration, NOx concentration, oxygen volume and temperature are measured and tested. It is observed that the NOx distribution at the outlets is severely uneven, and the ammonia slip concentration is beyond the designed value. In addition, in the area where the ammonia slip concentration is high, the NOx concentration is low and the denitration efficiency is high. Also at some sampling points, high ammonia slip and NOx concentrations are observed due to the heavy damage of catalyst caused by the high flue gas flow speed. The test results indicate that after ultra-low emission retrofit, the ammonia injection needs to be optimized and the flue flow field simulation test shall be carried out to improve the operation effect and economic performance of SCR denitration devices.

关 键 词：超低排放 氮氧化物 SCR脱硝 相对标准偏差 喷氨优化 逃逸氨 

分 类 号：X773[环境科学与工程—环境工程]