燃煤电站静电除尘器前后汞的形态分布特性  

The Distribution Characteristic of Mercury Speciation Around ESP in a Coal Fired Power Plant

作　　者：杨祥花[1] 段钰锋[2] 禚玉群[3] 杨立国[2] 陈雷[3] 李彦[3] 张亮[3] 杨林军[2] 沈湘林[2] 徐旭常[3] 

机构地区：[1]河海大学机电工程学院,江苏常州213022 [2]东南大学洁净煤发电及燃烧技术教育部重点实验室,江苏南京210096 [3]清华大学热能工程系,北京100084

出　　处：《河海大学常州分校学报》2006年第3期39-42,共4页Journal of Hohai University Changzhou

基　　金：国家重点基础研究发展计划(973计划)资助项目(2002CB211600)

摘　　要：探讨燃煤电站静电除尘器(ESP)前后汞的形态分布特性.采用美国测量燃煤烟气中汞浓度的标准方法——安大略法,对某220 MW“W”型煤粉锅炉系统中烟气经过ESP前后的汞浓度进行现场测试和分析.给出了烟气中氧化汞、元素汞、颗粒汞的分布,得到了煤粉炉系统的汞平衡.烟气在经过ESP前后,汞的分布形态发生了较大的变化,其中氧化汞的浓度下降,元素汞的浓度上升,ESP对汞的综合脱除效率约为36.28%.试验表明,ESP对汞的吸附和脱除作用除与飞灰中的碳含量和颗粒粒径有关外,还可能与吸附于其表面的其他元素的物理化学特性有关.The mercury speciation distribution characteristic around electrostatic precipitato （ESP） in a coal-fired power plant is discussed. The Ontario Hydro Method （OHM） was used for the insitu mercury measurement and analysis of the mercury concentration in the flue gas flowing through the ESP in a 220 MW W-type pulverized coal furnace. The distribution of mercury speciation of Hg^0, Hg^2＋ and Hge was detected. The mercury balance of this pulverized coal furnace was derived from the measured data based on samples of coal, bottom ash, fly ash and flue gas. Results show that the mercury speciation distribution varies greatly when the flue gas flows through the ESP. The concentration of the oxidized mercury decreases and that of the elemental mercury increases, resulting in an overall mercury removal efficiency of 36.28%. Tests reveal that the absorption and removal of mercury strongly depends on the carbon content and the particle sizes in fly ashes. The physical and chemical features of other substances on fly ash surfaces may also have influence to the mercury absorption.

关 键 词：燃煤电站 汞测试 汞形态 OHM ESP 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程] TQ038.1[化学工程]