燃煤电站布袋除尘器和静电除尘器脱汞性能比较

采用国际上通用的Ontario Hydro方法（OHM）对中国五个燃煤电站布袋除尘器（FF）/静电除尘器（ESP）前、后的烟气进行采样，应用美国EPA标准方法测定了烟气中Hg0、Hg2+和HgP的浓度。应用DMA80测定固体样品（煤、底灰、ESP飞灰）中的汞浓度。由汞平衡得出各个环节中汞所占的份额。由此得到FF和ESP脱除烟气中汞的性能。安装FF的电站1和2的综合脱除效率约为80%和20%，安装ESP的电站3、4和5的综合脱除效率分别为6%、20%和4%左右。这说明FF比ESP有更加优良的脱汞性能，而且FF/ESP脱除烟气中的汞受到很多因素的影响。

Comparison of mercury removal characteristic between fabric filter and electrostatic precipitators of coal-fired power plants

By applying the Ontario Hydro Method (OHM) and the US EPA standard methods, the sampling of mercury in the flue gas before and after fabric filter (FF)/electrostatic precipitator (ESP) located at five coal fired power plants was carried out on site and various mercury speciation such as Hg0, Hg2+, and HgP in flue gas were analyzed. The solid samples, such as coal, bottom ash, and FF/ESP ash, were analyzed by DMA80 based on EPA Method 7473. According to mercury balance, the mercury speciation and its distribution in different locations downstream the flue gas were obtained. The mercury removal efficiency of coal fired power plants 1 and 2 installed FF is higher than 80% and 20%, respectively, while that of plants 3, 4, and 5 installed ESP is around 6%, 20%, and 4%, respectively. It can be concluded that the performance of mercury removal in FF is better than ESP, and then various factors have important effects on the mercury removal.