SO_3在燃煤电厂各设备中形成和脱除现状研究  

Formation and Removal of SO_3 in Different Equipment of Coal-fired Power Plant: a Review

作　　者：舒喜 田原润 惠润堂 杨爱勇[1] 申智勇[1] 孙尊强 

机构地区：[1]国电环境保护研究院,江苏南京210031 [2]云南农业大学,云南昆明650051

出　　处：《环境科学与技术》2017年第11期121-126,共6页Environmental Science & Technology

基　　金：国家"863"计划项目:燃煤电站多污染物综合控制技术研究与示范(2013AA065401)

摘　　要：燃煤烟气中的SO_3会引起设备的腐蚀和堵塞以及排放蓝烟,摸清SO_3在燃煤电厂各设备中形成和脱除现状的现状对于设备选型、SO_3治理有着重要意义。目前对于SO_3转化率的认知与实际存在一定的偏差。该文根据收集到的测试报告以及前人研究结果,对SO_3在燃煤烟气中的形成和脱除现状进行研究。研究结果表明:SO_2向SO_3转化主要在锅炉、SCR等设备中发生,转化分别约为1%~8%、0.5%~2%。此外,电除尘器(主要是湿式电除尘器)也会发生SO_2向SO_3的转化。在空预器、低低温电除尘器、干法脱硫、湿法脱硫、湿式电除尘器等装置中主要以SO_3的脱除为主,效率分别在10%~50%、20%~50%、95%、30%~80%、40%~95%。SO_3在各装置中的生成和脱除效率差异很大,影响因素众多。各电厂实际的SO_3形成和脱除现状需要进行相关检测进行确定。SO3 in coal-fired flue gas gives rise to blue smoke emission, causing corrosion and blockage of the equipment in the coal fired power plant. In this paper, based on the previous studies and the existing test reports, the mechanism and the present situation of the formation and removal of SO3 in coal-fired flue gas were reviewed and discussed. Results of the review suggested that the conversion of SO2 to SO3 mainly took place in boiler and selective catalytic reduction（SCR）,the conversion rate being about 1%-8%, 0.5%-2%, respectively. In addition, electrostatic precipitator（ESP）, mainly wet ESP will also lead to the conversion. Removal of SO3 took place mostly in the equipment such as air preheater, low temperature electrostatic precipitator, dry desulfurization, wet desulfurization, wet ESP, and the removal efficiencies were 10 % -50%, 20% -50%, 95%,30%-80%, 40%-95%, respectively. Furthermore, formation of SO3 and SO3 removal efficiency, being influenced by many factors, very much varied in different equipment. Actually, determination of SO3 formation and removal efficiency in an individual power plant will require in-site measurement.

关 键 词：SO3 燃煤电厂 转化率 脱除效率 

分 类 号：X511[环境科学与工程—环境工程]