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Experimental study on mercury transformation and removal in coal-fired boiler flue gases

机译：燃煤锅炉烟气中汞转化和去除的实验研究

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This paper reported mercury speciation and emissions from five coal-fired power stations in China. The standard Ontario Hydro Method (OHM) was used into the flue gas mercury sampling before and after fabric filter (FF)/eIectrostatic precipitator (ESP) locations in these coal-fired power stations, and then various mercury speciation such as Hg~0, Hg~(2+) and Hg~p in flue gas, was analyzed by using EPA method. The solid samples such as coal, bottom ash and ESP ash, were analyzed by DMA 80 based on EPA Method 7473. Through analysis the mercury speciation varied greatly when flue gas went through FF/ESP. Of the total mercury in flue gas, the concentration of Hg~(2+) is in the range of 0.11-14.76 μg/N m~3 before FF/ESP and 0.02-21.20 μg/N m~3 after FF/ESP??? the concentration of Hg~0 ranges in 1.18-33.63 μg/N m~3 before FF/ESP and 0.77-13.57 μg/N m~3 after FF/ESP, and that of Hg~p is in the scope of 0-12.11 μg/N m~3 before FF/ESP and 0-0.54 μg/N m~3 after FF/ESP. The proportion of Hg~(2+) ranges from 4.87%-50.93% before FF/ESP and 2.02%-75.55% after FF/ESP, while that of Hg° is between 13.81% - 94.79% before FF/ESP and 15.69%-98% after FF/ESP, with that of Hg~p is in the range of 0%-45.13% before FF/ESP and 0%-11.03% after FF/ESP. The mercury in flue gas mainly existed in the forms of Hg° and Hg~(2+). The concentrations of chlorine and sulfur in coal and flue gas influence the species of Hg that are formed in the flue gas entering air pollution control devices. The concentrations of chlorine, sulfur and mercury in coal and the compositions of fly ash had significant effects on mercury emissions.
机译：本文报道了中国五个燃煤电厂的汞形态和排放。在这些燃煤电站的织物过滤器（FF）/静电除尘器（ESP）位置之前和之后，在烟道气汞采样中使用了标准的安大略省水文方法（OHM），然后进行了各种汞形态分析，例如Hg〜0，采用EPA法对烟气中的Hg〜（2+）和Hg〜p进行了分析。 DMA 80基于EPA方法7473对煤，底灰和ESP灰等固体样品进行了分析。通过分析，当烟道气通过FF / ESP时，汞的形态变化很大。在烟气中的汞总量中，FF / ESP前的Hg〜（2+）浓度范围为0.11-14.76μg/ N m〜3，FF / ESP后的Hg〜（2+）浓度为0.02-21.20μg/ N m〜3？ ?? FF / ESP前Hg〜0的浓度范围为1.18-33.63μg/ N m〜3，FF / ESP后Hg〜p的浓度范围为0.77-13.57μg/ N m〜3，Hg〜p的浓度范围为0-12.11 FF / ESP前为μg/ N m〜3，FF / ESP后为0-0.54μg/ N m〜3。 Hg〜（2+）的比例介于FF / ESP前的4.87％-50.93％和FF / ESP后的2.02％-75.55％，而Hg°的比例介于FF / ESP前的13.81％-94.79％和15.69％ FF / ESP后为-98％，Hg〜p在FF / ESP前为0％-45.13％，FF / ESP后为0％-11.03％。烟气中的汞主要以Hg°和Hg〜（2+）的形式存在。煤和烟道气中的氯和硫的浓度会影响进入空气污染控制装置的烟道气中形成的Hg种类。煤中氯，硫和汞的浓度以及粉煤灰的组成对汞排放有重大影响。

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