燃煤电厂烟气中SO_(3)排放控制中试研究  

A Pilot-scale Research on SO_(3)Control in Flue Gas of Coal Fired Power Plant

作　　者：刘毅 LIU Yi(CHN ENERGY New Energy Technology Research Institute Co.,Ltd.,Beijing 102211,China)

机构地区：[1]国家能源集团新能源技术研究院有限公司,北京102211

出　　处：《中国电力》2022年第7期201-208,共8页Electric Power

基　　金：国家科技支撑计划资助项目(大型燃煤电站近零排放控制关键技术及工程示范)。

摘　　要：燃煤电厂SO_(3)排放造成严重环境问题,本文利用某电厂污染物脱除中试平台对神华煤燃烧烟气中的SO_(3)的生成和脱除特性进行了系统研究。结果表明,采用选择性催化还原法(selective catalytic reduction,SCR)的脱硝反应器中烟气SO_(2)/SO_(3)的转化率随反应器入口烟气温度的增大而增大。低低温电除尘器(lowlow temperature electrostatic precipitator,LLT-ESP)对SO_(3)的脱除效率随入口烟气温度的增加而减小;湿法脱硫系统(wet flue gas desulfurization,WFGD)的喷淋量达到一定程度后,继续增加喷淋量对提升烟气中SO_(3)的脱除效果并不明显。当SCR反应器、LLT-ESP入口烟气温度分别为290℃和130℃,WFGD系统3层喷淋层运行时,SO_(3)的脱除效率稳定在75%~80%,此时,NO_(x)和SO_(2)排放浓度远低于超低排放要求。SO_(3) emission from coal fired power plant causes serious environment issues.In this paper,the generation and removal of SO_(3) in flue gas was investigated on a pilot-scale platform of multi-pollutant removal in a Beijing power plant where the Shenhua coal was combusted.The results showed that increasing the inlet temperature of Selective Catalytic Reduction(SCR)reactor led to an increase in the conversion rate of SO_(2)/SO_(3).The SO_(3) removal efficiency of low-low temperature electrostatic precipitator(LLT-ESP)decreases with the increase of inlet flue gas temperature.No obvious effect on improving the removal efficiency of SO_(3) with a further increase in the amount of the slurry of the wet flue gas desulfurization(WFGD)system.SO_(3) removal efficiency could be maintained in 75%and 80%when 3 circulating pumps was in operation and the inlet temperature of SCR and LLT-ESP were 290℃and 130℃respectively.Under this circumstance,the emission concentrations of NO_(x) and SO_(2) were far below the ultra-low emission requirements.

关 键 词：SO_(3) SCR反应器 低低温电除尘器 脱硫系统 

分 类 号：X773[环境科学与工程—环境工程]