摘要
通过调整某660 MW超低排放燃煤电厂低低温省煤器烟气温度,测试了煤中汞质量分数和电除尘器出入口烟气中各形态汞的质量浓度,分析了不同烟气温度下汞形态的变化特征。结果表明:低低温省煤器烟气温度会影响汞的形态分布,烟气温度降低时Hg^0向Hg^(2+)或Hg_p转变;低低温电除尘对Hg^0和Hg^(2+)具有协同脱除作用;低低温省煤器出口烟气温度为90℃时,低低温电除尘器入口Hg^(2+)和Hg_p的质量分数最高,低低温电除尘器总汞脱除率为84.4%,出口烟气中Hg^0和Hg^(2+)的质量浓度最低,此工况下低低温电除尘器对汞的协同脱除效果最佳;低低温省煤器停运时,低低温电除尘器出口烟气Hg^0和Hg^(2+)的质量浓度高于其他工况。
By adjusting the flue gas temperature of low-low temperature economizer in a 660 MW ultra-low emission coal-fired power plant,the mercury content in coal and the mercury concentration of different species in flue gas at inlet and outlet of the electrostatic precipitator(ESP)were measured,so as to study the variation characteristics of mercury speciation in the flue gas under different working conditions.Results show that the flue gas temperature in low-low temperature economizer would affect the distribution of mercury speciation,and when the flue gas temperature drops,the elemental mercury turns into oxidized mercury and particulate mercury.The low-low temperature ESP has a synergistic effect on the removal of both gaseous elemental mercury and oxidized mercury.When the outlet flue gas temperature of low-low temperature economizer is 90℃,the shares of elemental mercury and particulate mercury are the highest at the inlet of low-low temperature ESP,while the mass concentrations of elemental mercury and oxidized mercury are the lowest in the outlet flue gas,indicating an optimal effect of low-low temperature ESP on the removal of mercury,with a removal efficiency reaching 84.4%.The mass concentrations of gaseous elemental mercury and oxidized mercury in the outlet flue gas of low-low temperature ESP are higher than other working conditions when the low-low temperature economizer is out of service.
作者
赵毅
韩立鹏
ZHAO Yi;HAN Lipeng(School of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Coal-based Clean Energy,Huaneng Clean Energy Research Institute,Beijing 102209,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2019年第4期319-323,330,共6页
Journal of Chinese Society of Power Engineering
基金
国家重点研发计划资助项目(2017YFC0210603)
关键词
燃煤烟气
协同脱汞
单质汞
二价汞
flue gas
synergistic removal of mercury
elemental mercury
oxidized mercury
