尿素-SNCR法脱除污泥与煤混烧烟气中NO_x试验研究  

Experimental Study on Denitrification from Sewage Sludge and Coal Co-firing Flue Gas Using Urea-SNCR Technology

作　　者：方平[1,2] 唐子君 唐志雄 岑超平 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]广州华科环保工程有限公司,广东广州510655

出　　处：《环境科学与技术》2014年第3期104-107,131,共5页Environmental Science & Technology

基　　金：环保公益性行业科研专项重大项目(201109001);广东省水与大气污染防治重点实验室(2011A060901002);广东省战略性新兴产业核心技术攻关项目(2011A032303002)

摘　　要：文章在200m^3／h烟气中试试验平台上开展污泥与煤混烧烟气SNCR脱硝试验研究。在研究污泥与煤混烧NOx排放特性基础上，关注NOx的去除效率，研究还原剂种类、燃烧温度、氨氮比、添加剂等因素对尿素-SNCR法脱硝的影响。实验结果表明污泥的添加会导致烟气中NO=和SO2排放浓度显著增加；还原剂种类、燃烧温度、氨氮比对尿素-SNCR法脱硝具有重要影响，脱硝效率随着尿素浓度、氨氮比的增大而增加，随着燃烧温度的升高先增加后减小。当尿素使用浓度为12％，氨氮比为1．5：1，温度区间为850-900℃时，尿素-SNCR法脱硝效率可达到50％，同时H2O2添加剂对SNCR脱硝具有明显的促进作用。该技术非常适合工业锅炉协同处置城市污泥烟气脱硝应用。The experiments were performed in a 200 m^3/h pilot platform to study NOx removal using urea-SNCR technology. On the basis of the study of sewage sludge and coal burning NOx emission characteristics with focus on NOx removal effi-ciencies, the influences of reducing agent, combustion temperature, ammonia ratio and additives were systematically investi-gated. Results indicated that NOx and SO2 emission concentrations in the flue gas were significantly increased when adding sludge to the coal. Denitrification efficiency of the urea-SNCR technology was significant influenced by reducing agent, com-bustion temperature and ammonia ratio, with denitrification efficiency increase with the increment of urea concentration and ammonia ratio. Denitrification efficiency increased as the combustion temperature was increased at first and then decreased with the increment of combustion temperature. With urea as the reducing agent, when urea concentration was 12 wt%, ammo-nia ratio was 1.5：1, temperature range of reaction was 850-900 ℃, NOx removal efficiency was 50%, and hydrogen peroxide additive could promote NOx removal. The urea-SNCR technology is very suitable for the application of flue gas denitrification in industrial boilers collaborative disposal of sewage sludge.

关 键 词：污泥 混烧 尿素 SNCR 脱硝 

分 类 号：X511[环境科学与工程—环境工程]