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采用Ontario-Hydro method(OHM)、汞连续测量仪(Hg-SCEM)和EPA固体吸附剂法(Appendix K)测量了860 MW燃煤电站锅炉烟气中汞排放及其形态分布,并基于煤、黄铁矿、底灰、飞灰、脱硫浆液和烟气中的汞含量,分析了汞在燃烧产物中的质量平衡.结果表明:OHM和Hg-SCEM汞测量方法可以用于监测燃煤电站的汞排放,其相对测量偏差小于20%;烟气中总汞的排放浓度随着入炉燃料中汞含量的变化而变化;对于高褐煤掺烧比例的电站锅炉,烟气中元素态汞占总汞比例为48.6%~77.7%,湿法烟气脱硫装置可以脱除90%以上的氧化态汞,电除尘器和湿法烟气脱硫装置的汞脱除效率分别约为15%和34%.
The mercury emissions and their morphological distribution in the flue gas from an 860 MW coal-fired power station boiler were measured using Ontario-Hydro method (OHM), mercury continuous meter (Hg-SCEM) and EPA solid-state sorbent method (Appendix K) Pyrite, bottom ash, fly ash, desulphurization slurry and flue gas, the mass balance of mercury in the combustion products was analyzed.The results showed that the mercury and mercury-measuring methods of OHM and Hg-SCEM could be used to monitor the mercury content in coal- Mercury emissions, the relative deviation of measurement is less than 20%; the concentration of total mercury in flue gas changes with the change of mercury content in the fuel into the furnace; for high power coal fired boilers, the elemental mercury in flue gas accounts for Mercury ratio is 48.6% -77.7%. Wet FGD can remove more than 90% of the oxidation state mercury. The mercury removal efficiencies of ESP and wet FGD are about 15% and 34%, respectively.