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  • 尹展翅,黄羽,陈雨,郭欣.SO2、NO对汞在湿法电除尘器中脱除的影响[J].环境工程学报,2019,13(5):1139-1147.DOI:10.12030/j.cjee.201811155    [点击复制]
  • YIN Zhanchi,HUANG Yu,CHEN Yu,GUO Xin.SO2 and NO influences on mercury removal in wet electrostatic precipitator[J].,2019,13(5):1139-1147.DOI:10.12030/j.cjee.201811155   [点击复制]
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SO2、NO对汞在湿法电除尘器中脱除的影响
尹展翅,黄羽,陈雨,郭欣
0
(华中科技大学能源与动力工程学院,武汉 430074)
摘要:
湿法电除尘器(WESP)作为一种控制烟气中超细颗粒物的有效手段被应用于燃煤电厂的超低排放改造中,然而烟气中的Hg0受电场、水膜、烟气组分等因素的影响在WESP中的协同脱除机理尚不明确。为了深入了解该机理,探讨了WESP电场和水膜对Hg0的控制机理,并进一步研究了烟气中SO2、NO对Hg0在WESP中脱除的影响。结果表明:电场静电作用对烟气中Hg0脱除贡献较小,O2电离产物?O对Hg0的氧化作用是O2促进Hg0脱除的主要途径,水蒸气通过电离产生?OH促进Hg0氧化以及通过黏附作用促进Hg0脱除;水膜的裹挟作用对WESP系统Hg0的脱除贡献较小,溶于水中的汞不稳定且容易再释放;SO2、NO均通过在电场中电离产生?O促进Hg0氧化脱除,其中,SO2及其电离产物溶于水膜后可以与Hg2+形成稳定配合物抑制汞的再释放,而NO的电离产物在水膜中对汞再释放的抑制作用较小。
关键词:  湿法电除尘器  氧化脱汞  水膜吸收
DOI:10.12030/j.cjee.201811155
投稿时间:2018-11-26
基金项目:国家重点研发计划项目2016YFB0600604国家重点研发计划项目(2016YFB0600604)
SO2 and NO influences on mercury removal in wet electrostatic precipitator
YIN Zhanchi,HUANG Yu,CHEN Yu,GUO Xin
(School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)
Abstract:
As an effective measure of control ultrafine particles of flue gas, wet electrostatic precipitator (WESP) is applied to ultra-low emission modification of coal-fired power plant. However, the effects of electric field, water film and gas components on mercury in flue gas, and its synergistic mechanism in WESP, still remain unclear. Thus, the control mechanisms of WESP electric field and water film on Hg0 were investigated, and the effects of SO2 and NO on mercury removal by WESP were also assessed. The results indicated that electrostatic had a slight effect on Hg0 removal, while Hg0 oxidation with ·O, a type of product from O2 ionization in electric field, was the main route for O2 promoting Hg0 removal. Water vapor could promote Hg0 removal by adhesion effect and generating ·OH in electric field. The coerced effect of water film had a slight contribution to mercury removal and the mercury dissolved in water film was unstable and easy to release again. SO2 and NO could produce ·O by ionization and promote mercury oxidation removal, of which SO2 and its ionization products dissolved in water film and could form mercury stable complexes, which could inhibit re-emission of mercury, while NO ionization products dissolved in water film had slight effect on such inhibiting effect. This study present the synergistic mechanism of mercury removal influenced by SO2 and NO in WESP.
Key words:  wet electrostatic precipitator  mercury oxidation removal  water film absorption