大型循环流化床锅炉与煤粉炉汞排放特性研究  

Study on mercury emission characteristics of circulating fluidized bed boiler and pulverized coal boiler

作　　者：高天 肖日宏 揣兴 熊卓[1] 韦耿 李铁 杨凯 李果 赵永椿[1] 张军营[1] GAO Tian;XIAO Ri-hong;CHUAI Xing;XIONG Zhuo;WEI Geng;LI Tie;YANG Kai;LI Guo;ZHAO Yong-chun;ZHANG Jun-ying(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;Key Laboratory for Clean Combustion and Flue Gas Purification of Sichuan Province(Dongfang Boiler Co.,Ltd.,Dongfang Electric Group),Zigong 643099,China)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074 [2]清洁燃烧与烟气净化四川省重点实验室(东方电气集团东方锅炉股份有限公司),四川自贡643099

出　　处：《燃料化学学报》2022年第3期275-282,共8页Journal of Fuel Chemistry and Technology

基　　金：国家重点研发计划(2016YFB0600604);国家自然科学基金(42030807);湖北省重点研发计划项目(2020BCA076)资助。

摘　　要：选取600 MW循环流化床锅炉及1000 MW煤粉炉的电厂进行汞迁移转化及排放特性研究,采用EPA 30B法对烟气汞质量浓度进行采样,同时采集了入炉煤、飞灰、底渣、石灰石、工艺水、脱硫石膏、脱硫废水等固体液体样品进行对比分析。研究了两电厂现有污染物控制装置对汞的协同脱除作用,分析了汞的迁移转化规律。两电厂烟气经过污染物控制装置后,总汞脱除率均达到88%以上,最终排放烟气汞质量浓度分别为1.85和1.10μg/m^(3),明显低于中国现行排放标准要求,在现有设备条件下即可实现汞的达标排放。A 600 MW circulating fluidized bed boiler power plant and a 1000 MW pulverized coal boiler power plant were selected to study mercury migration,transformation and emission characteristics.The mercury concentration in flue gas was sampled by EPA 30B method,and the solid and liquid samples such as furnace-incoming coal,fly ash,bottom slag,limestone,process water,desulfurization gypsum and desulfurization wastewater were collected for analysis.The synergetic effect of existing pollutant control devices on mercury removal in two power plants was studied,and the migration and transformation law of mercury was discussed.After the flue gas of the two power plants passes through APCDs,the total mercury removal rate reaches over 88%,and the final mercury concentrations of the flue gas are 1.85 and 1.10μg/m^(3),which are far lower than the national requirements.Under the existing equipment conditions,the ultra-low mercury emission can be realized.

关 键 词：燃煤电厂 汞 循环流化床 煤粉炉 迁移转化 

分 类 号：X511[环境科学与工程—环境工程]