脱硫浆液汞二次释放的抑制性研究.docVIP

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南京信息职业技术学院

毕业设计(论文)

作者陈沫学号31631P28

系部环境信息学院

专业环境监测与控制技术

题目脱硫浆液汞二次释放的抑制性研究

指导教师张君

评阅教师

完成时间：2019年4月30日

毕业设计(论文)中文摘要

题目：脱硫浆液汞二次释放的一致性研究

摘要：在湿法烟气脱硫中，会存在大量的还原性物质，使得烟气中被捕集的二价汞被还原成Hg0，从而脱硫浆液中的汞以Hg0的形态排出，从而降低了湿法烟气脱硫系统的脱除效率。本文利用鼓泡反应器，研究反应时间、O2浓度、高锰酸钾浓度、对脱硫浆液中二价汞被还原的速率以及Hg0再释放性的影响。实验结果表明，在含有5%O2的条件下，随着曝气时间的增加，Hg0的在释放效率先降低再升高，在曝气时间60分钟的时候释放效率升高，反应时间最佳；当通入一定量的氮气和5%的氧气的时候，曝气30分钟，随着氧气浓度、高锰酸钾浓度的增加，被还原的Hg0逐步被氧化成Hg2=，抑制了二价汞的还原，从而降低Hg0的再释放效率；在溶液中加入一定的EDTA溶液对二价汞的还原也有一定的影响，当加入EDTA溶液的时候对二价汞的还原起到促进作用，从而提高了二价汞的再释放效率。

关键词：湿法烟气脱硫、二价汞还原、Hg0再释放

毕业设计(论文)外文摘要

Title:Consistency?study?on?secondary?release?of?mercury?from?desulfurized?slurry

Abstract:In?wet?flue?gas?desulfurization,?there?will?be?a?large?number?of?reducing?substances,?so?that?the?collected?二价汞?in?the?flue?gas?is?reduced?to?Hg0,?and?mercury?in?the?flue?gas?is?discharged?in?the?form?of?Hg0,?thus?reducing?the?removal?efficiency?of?the?wet?flue?gas?desulfurization?system.?In?this?paper,?the?effects?of?reaction?time,?O2?concentration,?potassium?permanganate?concentration,?the?reduction?rate?of?二价汞?in?desulfurization?slurry?and?the?rereleasability?of?Hg0?were?studied?in?a?bubbling?reactor.?The?experimental?results?showed?that?under?the?condition?of?5%O2,?with?the?increase?of?aeration?time,?the?release?efficiency?of?Hg0?first?decreased?and?then?increased,?and?the?release?efficiency?increased?at?the?aeration?time?of?60分钟,?and?the?reaction?time?was?the?best.?When?a?certain?amount?of?nitrogen?and?5%?oxygen?is?introduced,?aerate?for?30分钟.?With?the?increase?of?oxygen?concentration?and?potassium?permanganate?concentration,?the?reduced?Hg0?is?gradually?oxidized?to?Hg2=,?inhibiting?the?reduction?of?二价汞?and?thereby?reducing?the?re-release?efficiency?of?Hg0.?The?addition?of?certain?EDTA?solut