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Mercury Re-Emission in Flue Gas Multipollutants Simultaneous Absorption System

机译：烟气多污染物同时吸收系统中的汞再排放

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摘要

Recently, simultaneous removal of SO_2, NO_x and oxidized mercury in wet flue gas desulfurization (WFGD) scrubber has become a research focus. Mercury re-emission in traditional WFGD system has been widely reported due to the reduction of oxidized mercury by sulfite ions. However, in multipollutants simultaneous absorption system, the formation of a large quantity of nitrate and nitrite ions as NO_x absorption might also affect the reduction of oxidized mercury in the aqueous absorbent. As such, this paper studied the effects of nitrate and nitrite ions on mercury re-emission and its related mechanism. Experimental results revealed that the nitrate ions had neglected effect on mercury re-emission while the nitrite ions could greatly change the mercury re-emission behaviors. The nitrite ions could initially improve the Hg~0-emission through the decomposition of HgSO_3NO_2~-, but with a further increase in the concentration, they would then inhibit the reduction of bivalent mercury owing to the formation of Hg-nitrite complex [Hg(NO_2)_x~(2-x)]. In addition, the subsequent addition of Cl~- could further suppress the Hg~0 emission, where the formation of a stable Hg-SO_3-NO_2-Cl complex was assumed to be the main reason for such strong inhibition effect.
机译：近年来，湿法烟气脱硫（WFGD）洗涤塔中SO_2，NO_x和氧化汞的同时去除已成为研究的重点。由于亚硫酸根离子减少了氧化汞，传统WFGD系统中的汞再排放已被广泛报道。然而，在多污染物同时吸收系统中，大量的硝酸根和亚硝酸根离子作为NO_x吸收的形成也可能影响水性吸收剂中氧化汞的还原。因此，本文研究了硝酸根和亚硝酸根离子对汞再排放的影响及其相关机理。实验结果表明，硝酸根离子对汞再排放的影响被忽略，而亚硝酸盐离子可以极大地改变汞的再排放行为。亚硝酸根离子最初可以通过HgSO_3NO_2〜-的分解来改善Hg〜0的排放，但是随着浓度的进一步增加，它们会由于形成Hg-亚硝酸盐络合物而抑制二价汞的还原[Hg（ NO_2）_x〜（2-x）]。另外，随后加入Cl-可以进一步抑制Hg-0的释放，其中稳定的Hg-SO_3-NO_2-Cl络合物的形成被认为是产生这种强抑制作用的主要原因。

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  • 来源
    《Environmental Science & Technology》 |2014年第23期|14025-14030|共6页
  • 作者

    Yue Liu; Qingfeng Wang; Rongjun Mei; Haiqiang Wang; Xiaole Weng; Zhongbiao Wu;

  • 作者单位

    Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China,Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, P.R. China;

    Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China,Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, P.R. China;

    Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China,Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, P.R. China;

    Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China,Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, P.R. China;

    Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China,Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, P.R. China;

    Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China,Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, P.R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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