摘要
湿法烟气脱硫（WFGD）是目前最有效的电站排烟脱硫方法，作为未来潜在的多污染物排放控制装置，FGD对汞赋存价态和脱除效率的影响成为目前汞污染控制研究的热点。利用Ontario Hydro Method（OHM）方法和半连续汞浓度监测仪（SCMM），对2台500MW（热功率）电站煤粉锅炉配套的湿法烟气脱硫装置进行了现场测试。试验结果发现：WFGD装置对烟气内的氧化态的二价汞脱除效率可高达89．24％～99．1％；增加脱硫浆液和烟气体积比（L／G），有利于提高WFGD对二价氧化汞的脱除效率；WFGD对烟气中全汞的脱除效率可以达到50％以上，二价汞在全汞中所占的比例是决定FGD全汞脱除效果的关键因素。少于8％的氧化汞可以被还原为单质状态的汞，这种转化与浆液中硫酸氢根离子和金属离子有关，较高的SO，浓度有利于促进氧化汞还原作用的发生。
Wet flue gas desulfurization （WFGD） is at present the most effective way of desulfurization in power plants. As a future potential installation for controlling multi-pollutants, its effect on mercury transformation and efficiency of removal has at present become a hot subject in the research of how to get mercury contamination under control. On-site tests of a WFDG installation of a 500 MW （thermal power） pulverized coal fired boiler were carried out with the SemiContinuous Mercury Monitor （SCMM）, by using the Ontario Hydro Method （OHM）. Test results show that the removal efficiency of oxidized bivalent mercury may get as high as 89.24 % - 99.1%. An increase of the desulfurization liquid to flue gas （L/G） ratio is advantageous for raising the mercury removal efficiency of WFGD. Demercurization efficiency of WFGD may exceed 50 %, the crucial influencing factor being the share of bivalent mercury in the total mercury content. Less than 8 % mercury oxide can be reduced to elemental mercury, influenced by HSO4- ions and metal ions present in the liquid; a higher S02 concentration boosts the reduction of mercury oxide. Figs 5, tables 2 and refs 5
出处
《动力工程》
EI
CAS
CSCD
北大核心
2006年第4期554-557,567,共5页
Power Engineering
基金
973国家重大基础研究发展规划项目(2006cb2003)
国家人事部留学回国人员科技活动项目资金资助
关键词
环境工程学
锅炉排烟
烟气脱硫装置
汞
脱除效率
还原作用
environmental engineering
boiler flue gas
flue gas desulfurization installation
mercury
removal efficiency
reduction
