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大型煤粉锅炉汞的排放特性和迁移规律研究

唐念,  盘思伟

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文章导航 > 燃料化学学报（中英文）  > 2013 >  41(04): 484-490
唐念, 盘思伟. 大型煤粉锅炉汞的排放特性和迁移规律研究[J]. 燃料化学学报（中英文）, 2013, 41(04): 484-490.
引用本文: 唐念, 盘思伟. 大型煤粉锅炉汞的排放特性和迁移规律研究[J]. 燃料化学学报（中英文）, 2013, 41(04): 484-490.
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TANG Nian, PAN Si-wei. Study on mercury emission and migration from large-scale pulverized coal-fired boiler[J]. Journal of Fuel Chemistry and Technology, 2013, 41(04): 484-490.
Citation: TANG Nian, PAN Si-wei. Study on mercury emission and migration from large-scale pulverized coal-fired boiler[J]. Journal of Fuel Chemistry and Technology, 2013, 41(04): 484-490.
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大型煤粉锅炉汞的排放特性和迁移规律研究

  • 广东电网公司电力科学研究院, 广东 广州 510080

基金项目: 南方电网科技项目(K-GD2012-360).
详细信息
    通讯作者:

    唐念(1983-), 男, 湖南湘潭人, 工学博士, 工程师, 主要从事燃煤大气污染控制与治理方面的研究, E-mail: tangnian_2005@163.com; Tel:020-85124202.

  • 中图分类号: X 511

Study on mercury emission and migration from large-scale pulverized coal-fired boiler

  • Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China

    摘要
  • 摘要: 采用EPA 30B方法,对某大型火电厂四台典型煤粉锅炉进行了烟气Hg排放测试,并选取其中两台代表性锅炉对各输入／输出物料进行了Hg量对比分析.通过系统的汞质量平衡核算,得出各物料中汞所占的比例,并据此分析了选择性催化还原脱硝装置(SCR)、静电除尘器(ESP)和湿法脱硫装置(WFGD)等主要烟气净化设施对汞排放的影响,在此基础上研究得到系统汞的迁移规律.结果表明,四台锅炉的烟气Hg排放浓度都不高,普遍在3 μg／m3以下,明显低于新国标规定的排放限值,其中,配备SCR时Hg排放浓度明显更低.其原因在于,设置有SCR时,烟气中相当部分的Hg0会被催化氧化成Hg2+,Hg2+易于被飞灰吸附而脱除.WFGD对Hg2+的吸收比Hg0强得多,因此,排放烟气中汞的形态以Hg0为主,吸收的Hg绝大部分转移至脱硫石膏中.脱硫废水和炉渣对Hg的富集能力都非常有限.
    Abstract: In order to study the characteristics of mercury emission and migration, EPA 30B method was used to determine the Hg concentrations in flue gases emitted from four typical pulverized coal-fired boilers in a large-scale power plant, and the Hg contents of related input／output materials in two of these boilers were also analyzed and compared. According to mass balance, the Hg distribution in different materials was obtained, and then the effect of major flue gas purification systems including selective catalytic reduction (SCR), electrostatic precipitation (ESP) and wet flue gas desulfurization (WFGD) on Hg emission was clarified. Based on these, the migration pattern of Hg in pulverized coal-fired boilers was summarized systematically. Experimental results indicated that Hg emissions of all the four boilers were below 3 μg／m3, which was much lower than the limit specified by the new Chinese national standard. The emission was even significantly lowered when SCR system was located upstream. The reason was in the fact that, when there was SCR system located, lots of Hg0 in flue gas could be catalyzed to Hg2+ and then adsorbed by fly ash. The solubility of Hg2+ was much higher than that of Hg0 in WFGD system, and the major Hg speciation in exhaust flue gas was Hg0. Most of the Hg absorbed in WFGD was transferred into desulfurization gypsum, while the enrichment in both desulfurization waste water and bottom ash was limited.
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    • 参考文献(19)
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出版历程
  • 收稿日期:  2012-10-19
  • 修回日期:  2012-12-13
  • 刊出日期:  2013-04-30

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