摘要
SO3是燃煤烟气的重要污染物之一,对电厂设备安全、大气环境和周边人群健康有严重危害。为研究超低排放机组SO3排放及减排效果,采用异丙醇吸收法对10台超低排放改造机组进行SO3测试,结果表明:超低排放系统对SO3具有较好的协同脱除效果,机组SO3脱除效率为74.3%~99.3%,与改造前相比,SO3减排效率达到56.3%~95.1%;电除尘器对SO3的脱除效果受温度影响较大,测试机组的SO3脱除效率为24.4%~66.4%;湿法脱硫装置通过浆液洗涤作用脱除SO3,SO3脱除效率为65.9%~70.5%;湿式电除尘对SO3脱除效率可达70%以上,受入口SO3含量低粒径小的影响,测试机组湿除SO3脱除效率为52.8%;烟气冷却器在对烟气进行降温和冷凝水回收过程中,由于热泳和扩散泳作用的存在,可以协同脱除SO3。
SO3is one of the important pollutants of coal-fired flue gas,which is seriously harmful to the safety of power plant equipment,the atmospheric environment and the health of surrounding people.In order to study the SO3emission and emission reduction effect of ultra-low emission units,10ultra-low emission units were tested by isopropanol absorption method.The results showed that the ultra-low emission system had a good synergistic effect on SO3removal.The SO3removal efficiency of the units was 74.3%to 99.3%.Compared with the former units,SO3emission reduction efficiency reached 56.3%to 95.1%.The removal effect of electrostatic precipitator on SO3was greatly affected by the temperature.The tested unit SO3removal efficiency was 24.4%to 66.4%.SO3was removed by wet desulfurization device through slurry washing,and the removal efficiency of SO3was 65.9%to 70.5%.Wet electrostatic precipitator removal efficiency of SO3can reach more than 70%.Affected by the low content of SO3at the entrance and the small particle size,the SO3removal efficiency of the test unit was 52.8%.In the process of cooling and condensing water recovery of flue gas,the flue gas cooler could remove SO3cooperatively due to the phenomenon of thermophoresis and diffusiophoresis.
作者
王妍艳
陶雷行
岳春妹
陈睿
陆骏超
刘志超
郑方栋
万迪
WANG Yanyan;TAO Leixing;YUE Chunmei;CHEN Rui;LU Junchao;LIU Zhichao;ZHENG Fangdong;WAN Di(Shanghai Minghua Electric Power Science&Technology Co.,Ltd.,Shanghai 200090,China)
出处
《电力与能源》
2020年第5期626-631,共6页
Power & Energy
关键词
燃煤机组
超低排放
SO3
异丙醇吸收法
减排效果
脱除效率
coal-fired units
ultra-low emission
SO3
isopropanol absorption
emission reduction effect
removal efficiency
