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300 MW燃煤电厂ESP和WFGD对烟气汞的脱除特性

李志超 ,  段钰锋 ,  王运军 ,  黄治军 ,  孟素丽 ,  沈解忠

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引用本文: 李志超, 段钰锋, 王运军, 黄治军, 孟素丽, 沈解忠. 300 MW燃煤电厂ESP和WFGD对烟气汞的脱除特性[J]. 燃料化学学报, 2013, 41(4): 491-498. shu
Citation:  LI Zhi-chao, DUAN Yu-feng, WANG Yun-jun, HUANG Zhi-jun, MENG Su-li, SHEN Jie-zhong. Mercury removal by ESP and WFGD in a 300 MW coal-fired power plant[J]. Journal of Fuel Chemistry and Technology, 2013, 41(4): 491-498. shu

300 MW燃煤电厂ESP和WFGD对烟气汞的脱除特性

    通讯作者: 段钰锋(1963-), 男, 教授, 主要从事燃煤大气污染防治研究, E-mail:yfduan@seu.edu.cn.
  • 基金项目:

    国家自然科学基金(51076030) (51076030)

    江苏省环保科研课题基金(201113) (201113)

    煤燃烧国家重点实验室开放基金(FSKLCC1002). (FSKLCC1002)

摘要: 采用燃煤电厂汞形态浓度取样测试OHM标准方法,对一座300 MW燃煤电厂静电除尘器(ESP)和湿法脱硫装置(WFGD)前后烟气进行了等速取样.使用美国Leeman Labs Hydra AA全自动汞分析仪检测烟气中的汞形态浓度.采集了固体样品,包括入炉煤、底渣、ESP电场灰、脱硫剂石灰石、脱硫产物石膏等,使用意大利Milestone公司生产的DMA80全自动汞分析仪检测固体样品中的汞浓度.计算锅炉系统的汞质量平衡,获得了ESP和WFGD前后烟气的汞形态浓度和分布规律,分析讨论了影响烟气汞形态转化的各种影响因素.结果表明,燃煤烟气中气态单质汞Hg0和气态氧化汞Hg2+占到总汞量的95%.煤渣中的汞可忽略不计;ESP对颗粒态汞Hgp的脱除效率达到95%以上,但是对Hg0和Hg2+脱除率不高.ESP对烟气总汞HgT脱除效率为12.77%~17.38%;WFGD对Hg2+的脱除率达到79.93%~90.53%,但是对Hg0没有脱除效果,其含量不仅没有下降反而有少量上升,说明有部分Hg2+在WFGD中被还原成Hg0.WFGD对HgT脱除效率为9.68%~29.36%;该电厂现有污染控制设备ESP+WFGD可以脱除全部的Hgp和大部分Hg2+,但是由于部分Hg2+的还原使得HgT的脱除效率在25.38%~38.38%.综合来看,该燃煤电厂的污染物控制设备在进行除尘和脱硫的同时,对汞的脱除率并不高,与燃煤中的氯含量较低有关.

English

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  • 收稿日期:  2012-08-02
  • 网络出版日期:  2012-10-24
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