超低排放脱硫塔和湿式静电对烟气污染物的协同脱除  

Synergistic Removal of WFGD and WESP on Gas Pollutants with Ultra Low Emission

作　　者：李清毅 胡达清 张军[2] 高翔[2] 

机构地区：[1]浙江天地环保科技有限公司,浙江杭州310003 [2]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《热能动力工程》2017年第8期138-143,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家杰出青年科学基金项目(51125025);浙江省重大科技专项重点社会发展项目(2014C03018)

摘　　要：试验测定不同负荷下脱硫吸收塔进出口和湿式静电出口烟尘、PM_(2.5)、SO_2、SO_3、汞和液滴等多种污染物的浓度,研究脱硫吸收塔和湿式静电对多种污染物的协同脱除机制。试验结果表明:脱硫吸收塔和湿式静电均可协同脱除烟气中的SO_2、烟尘、PM_(2.5)、SO_3、汞和液滴等。相比较而言,脱硫塔对SO_2和汞的脱除效率高,湿式静电对总尘、PM_(2.5)和液滴的脱除效率高,对SO_3的脱除二者基本相当。脱硫吸收塔和湿式静电对污染物的协同脱除效率较高。对烟尘、PM_(2.5)、SO_2、SO_3、汞和液滴的协同脱除效率可分别高达87.3%、85.8%、99.25%、94.00%、89.31%和79.10%。脱硫吸收塔产生的气溶胶、二次释放的汞和液滴,经湿式静电进行进一步脱除。脱硫吸收塔和湿式静电对多种污染物有较强的协同脱除作用。Concentrations of total PM,PM_(2.5),SO_2,SO_3,Hg and droplet were measured before/after wet flue gas desulfurization( WFGD) and after wet electrostatic precipitator( WESP) under different unit loads to determine the simultaneous removal of these pollutants. The results showed that both the WFGD and WESP can remove these pollutants. The WFGD is showed to have higher removal efficiency of SO_2,Hg,while the WESP performed better in the removal of total PM,PM_(2.5)and droplet. Both the WFGD and the WESP can well remove SO_3. The emissions of these pollutants all meet the standards of ultra-low emission for coal-fired power plants due to the effectiveness of simultaneous removal. The simultaneous removal efficiencies of total PM,PM_(2.5),SO_2,SO_3,Hg and droplet are 87. 3%,85. 8%,99. 25%,94. 00%,89. 31% and 79. 10%,respectively. The SO_3 acid mists produced and Hg0 released by WFGD can be removed by WESP. The WFGD and the WESP have simultaneous removal effect on pollutants.

关 键 词：脱硫吸收塔 湿式静电 协同脱除 污染物 效率 

分 类 号：X511[环境科学与工程—环境工程]