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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

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方平 1   唐子君 2   唐志雄 2   岑超平 2 *  
文摘 文章在200 m~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NO_x排放特性基础上,关注NO_x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_x和SO_2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H_2O_2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。
其他语种文摘 The experiments were performed in a 200 m~3/h pilot platform to study NO_x removal using urea-SNCR technology. On the basis of the study of sewage sludge and coal burning NO_x emission characteristics with focus on NO_x removal efficiencies, the influences of reducing agent, combustion temperature, ammonia ratio and additives were systematically investigated. Results indicated that NO_x and SO_2 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, combustion 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%, ammonia ratio was 1.5∶1, temperature range of reaction was 850~900 ℃, NO_x removal efficiency was 50%, and hydrogen peroxide additive could promote NO_x removal. The urea-SNCR technology is very suitable for the application of flue gas denitrification in industrial boilers collaborative disposal of sewage sludge.
来源 环境科学与技术 ,2014,37(3):104-107,131 【扩展库】
关键词 污泥 ; 混烧 ; 尿素 ; SNCR ; 脱硝
地址

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

语种 中文
文献类型 研究性论文
ISSN 1003-6504
学科 环境污染及其防治
基金 国家环境保护公益性行业科研专项 ;  广东省水与大气污染防治重点实验室 ;  广东省战略性新兴产业核心技术攻关项目
文献收藏号 CSCD:5089208

参考文献 共 13 共1页

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引证文献 1

1 张学杨 微波辐照活性炭还原氮氧化物 环境工程学报,2017,11(8):4685-4690
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