SCR脱硝系统在危废焚烧烟气处理中的应用研究  

Research on Application of SCR Denitrification System for Flue Gas Treatment of Hazardous Waste Incineration

作　　者：马振 MA Zhen(Shanghai Automotive Asset Management Co.,Ltd.,Shanghai 200000,China)

机构地区：[1]上海汽车资产经营有限公司,上海200000

出　　处：《中国资源综合利用》2024年第3期180-182,199,共4页China Resources Comprehensive Utilization

摘　　要：选择性催化还原(Selective Catalytic Reduction,SCR)是危废焚烧企业广泛应用的烟气处理工艺。某危废焚烧处置项目SCR脱硝系统位于烟气处理的湿法脱酸工艺后端,SCR反应器设计温度为260℃,升温过程需要消耗大量天然气加热烟气。因此,有必要优化工艺方案设计,开展经济效益分析,明确SCR脱硝系统运行风险,提出应对措施。经设计,采用两级烟气换热系统,湿法脱酸后的烟气与袋滤房出口烟气一次换热,再与SCR反应后的烟气二次换热,两次加热升温后烟气温度达到220℃,然后烟气进入SCR反应器。与天然气直接加热方式相比,该工艺可明显减少天然气消耗量,每年可节省天然气费用约530万元,具有很好的环境效益与经济效益。Selective Catalytic Reduction(SCR)is a widely used flue gas treatment process in hazardous waste incineration enterprises.The SCR denitrification system of a hazardous waste incineration disposal project is located at the rear end of the wet acid removal process for flue gas treatment,and the design temperature of the SCR reactor is 260℃,and the heating process requires a large amount of natural gas to heat the flue gas.Therefore,it is necessary to optimize the design of the process plan,conduct economic benefit analysis,clarify the operational risks of the SCR denitrification system,and propose countermeasures.After design,a two-stage flue gas heat exchange system is adopted,the flue gas after wet deacidification undergoes primary heat exchange with the outlet flue gas of the bag filter room,and then undergoes secondary heat exchange with the flue gas after reacting with SCR,after two heating cycles,the flue gas temperature reaches 220℃,and then enters the SCR reactor.Compared with the direct heating method of natural gas,this process can significantly reduce natural gas consumption,saving about 5.3 million yuan in natural gas costs annually,and has good environmental and economic benefits.

关 键 词：危废焚烧 烟气处理 选择性催化还原(SCR)脱硝 烟气-烟气换热器 氨逃逸 

分 类 号：X701[环境科学与工程—环境工程]