Experimental study on mercury capture using non-carbon sorbents in 100 MW coal-fired power plant

doi:10.3969/j.issn.0438-1157.2014.11.028

Abstract

Abstract: The mercury removal from the flue gas discharged from a 100 MW coal-fired power plant in China by non-carbon sorbents CuCl₂ impregnated alumina and zeolite were experimentally investigated in this paper. When the sorbent were added into, the mercury speciation in flue gas across ESP was directly sampled and analyzed using EPA 30B standard method. The effect of injection rate was studied. The mercury balances measured on-site were between 77.1%—111.5%, and the results of mercury balance after correction suggested that the rates of mercury removal increased with increase of injecting amounts, and was up to 30.6% for modified alumina and 29.2% for modified zeolite. The Hg⁰ content in flue gas reduced considerably after sorbent injection, and decreased from 40% to 22% when the sorbent injection rate was 0.22 g·m^-3. Non-carbon sorbent injection combined with WFGD system could be an effective technology for controlling mercury emission of coal-fired power plant.

Key words: flue gas, sorbents, adsorption, mercury removal, non-carbon

摘要： 选取一个100 MW燃煤电厂对氯化铜改性氧化铝和氯化铜改性沸石进行喷射脱汞实验,应用EPA 30B标准方法对静电除尘器(ESP)前后烟气中的汞价态分布进行了采样和测试.研究了吸附剂喷射量对烟气中汞脱除率的影响.现场测试的汞平衡结果为77.1%～111.5%.经修正的汞平衡结果表明,吸附剂喷射量越大,脱汞率越高.改性氧化铝的脱汞率最高可达30.6%,改性沸石的脱汞率最高可达29.2%.喷射非碳基吸附剂后烟气中元素汞(Hg⁰)显著下降,在喷射量为0.22 g·m^-3时,两种吸附剂可将烟气中Hg⁰比例由40%降低至22%左右,减少的Hg⁰主要转化为Hg^P.非碳基吸附剂与湿法脱硫(WFGD)系统协同使用可以有效减少Hg⁰向大气中的排放.

关键词: 烟道气, 吸附剂, 吸附, 脱汞, 非碳基

CLC Number:

TK09

DU Wen, YIN Libao, ZHUO Yuqun, XU Qisheng, ZHANG Liang, CHEN Changhe. Experimental study on mercury capture using non-carbon sorbents in 100 MW coal-fired power plant[J]. CIESC Journal, 2014, 65(11): 4413-4419.

杜雯, 殷立宝, 禚玉群, 徐齐胜, 张亮, 陈昌和. 100MW燃煤电厂非碳基吸附剂喷射脱汞实验研究[J]. 化工学报, 2014, 65(11): 4413-4419.

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