芬顿试剂对WFGD系统中Hg0再释放的影响研究

doi:10.19286/j.cnki.cci.2019.05.035

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摘要

基于鼓泡塔反应器，研究了WFGD系统中Hg0再释放特性，并探索了芬顿（Fenton）试剂抑制Hg0再释放的效果及机理。结果表明：还原性离子SO32-、HSO3-是引起Hg0再释放的主要原因。单独添加H2O2对Hg0再释放的抑制效果较差，但同时添加H2O2和Fe3+、Fe2+、Cu2+等金属离子时可有效抑制Hg0再释放，其抑制效果为Fe2+>Fe3+>Cu2+。芬顿试剂抑制Hg0再释放主要是由于氧化性基团OH·和OOH·可将Hg0氧化成Hg2+。添加Fe2+-Fenton试剂时，当脱硫液pH值为3.0 ~ 4.0，脱硫液温度为50 ℃左右，烟气温度为120 ℃左右时，WFGD系统脱汞性能较好；增大Fe2+浓度有利于提高脱汞效率，但当Fe2+浓度＞5×10-5后，脱汞效率几乎不再受Fe2+浓度影响。

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	王江
	杭朝冬
	张楹婧
	陈雪
	许家菱
	鲍静静

关键词 ：湿法烟气脱硫, Hg0再释放, 芬顿试剂, 脱汞, 氧化

Abstract：

In order to inhibit the re-emission of Hg0 in the WFGD system and improve the mercury removal efficiency, the re-emission characteristics of Hg0 in the WFGD system based on the bubbler reactor were studied, and the inhibiting effect of Fenton reagent on the re-emission of Hg0 and its inhibiting mechanism were explored. The results show that the reduction of Hg2+ by SO32- and HSO3- in desulfurization solution is the main cause of Hg0 re-emission. H2O2 had a poor inhibiting effect on Hg0 re-emission, but the addition of H2O2 together with metal ions such as Fe3+, Fe2+ and Cu2+ can effectively inhibit the re-emission of Hg0, and inhibitory effect is Fe2+ > Fe3+ > Cu2+. The main reason of Fenton reagent inhibiting Hg0 re-emission is that oxidizing groups OH· and OOH· can oxidize Hg0 to Hg2+. When adding Fe2+-Fenton reagent: pH value of the desulfurization solution is in the range of 3.0 ~ 4.0, desulfurization liquid temperature is about 50 ℃, flue gas temperature is 120 ℃, the mercury removal efficiency of WFGD system is the best. Increasing the concentration of Fe2+ is conducive to improve the efficiency of mercury removal. However, when the concentration of Fe2+ is greater than 5×10-5, the efficiency of mercury removal is hardly influenced by the concentration of Fe2+.

Key words： wet flue gas desulfurization Hg0 re-emission Fenton reagent mercury removal oxidation

作者简介: 王江（ 1997— ），女，布依族，贵州兴仁人，本科在读。

引用本文:

王江，杭朝冬，张楹婧，陈雪，许家菱，鲍静静. 芬顿试剂对WFGD系统中Hg0再释放的影响研究[J]. 煤炭与化工, 2019, 42(5): 121-125，152. Wang Jiang, Hang Chaodong, Zhang Yingjing, Chen Xue, Xu Jialing, Bao Jingjing. Effect of fenton reagent on Hg0 re-emission in wet flue gas desulfurization system. CCI, 2019, 42(5): 121-125，152.

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http://www.mtyhg.com.cn/CN/10.19286/j.cnki.cci.2019.05.035 或 http://www.mtyhg.com.cn/CN/Y2019/V42/I5/121

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