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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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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, 2013, 41(4): 484-490. shu
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(4): 484-490. shu

大型煤粉锅炉汞的排放特性和迁移规律研究

    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.
  • 基金项目:

    南方电网科技项目(K-GD2012-360). (K-GD2012-360)

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.

English

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  • 收稿日期:  2012-10-19
  • 网络出版日期:  2012-12-13
通讯作者: 陈斌, bchen63@163.com
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