摘要
目前燃煤电厂烟气汞的治理主要依靠常规污染物净化装置协同脱除。为了解我国超低排放电厂污染物净化设施的协同脱汞能力,对电厂汞排放现场测试数据进行统计分析。研究发现相同类型的污染物净化设施对汞的脱除能力有很大差别,选择性催化还原法(SCR)的汞氧化效率在13.2%~91.1%,平均氧化效率为52.7%;不同类型除尘器对汞的去除效果差异很大,其中低低温电除尘器(LLT-ESP)>电袋除尘器(ESP+FF)>普通电除尘器(ESP)。湿式石灰石-石膏法(WFGD)脱硫系统脱汞平均脱汞效率为54.3%,大部分WFGD的脱汞效率主要由Hg^(2+)的去除贡献得到。不同超低排放改造技术路线中以低低温电除尘器为核心的技术路线的平均脱汞效率最高,为91.3%。超低排放改造后机组的平均脱汞效率为80.1%,相比改造前提高约10%。
The treatment of mercury in flue gas of coal-fired power plants mainly relies on the collaborative removal of conventional pollutant purification devices.In order to understand the collaborative mercury removal capacity of pollutant purification facilities in ultra-low emission power plants in China,the field test data of mercury emission from power plants were statistically analyzed.The results reveal that the same type of pollutant purification facilities also have very different mercury removal capabilities.The mercury oxidation efficiency of selective catalytic reduction(SCR)is between 13.2%and 91.1%,and the average mercury oxidation efficiency is 52.7%.Different kinds of dust collectors show different mercury removal efficiency.Among them,LLT-ESP has the best mercury removal efficiency,followed by ESP+FF and ESP.The average mercury removal efficiency of wet limestone gypsum desulfurization system(WFGD)is 54.3%,which is mainly derived from the removal of Hg^(2+).The technical route with LLT-ESP as the core has the highest average mercury removal efficiency in different routes,which is 91.3%.The average mercury removal efficiency of the unit after ultra-low emission transformation is 80.1%,which is about 10%higher than that before transformation.
作者
曹晓满
刘亚文
张军梅
蒋鹭翔
郭娜
王祖武
CAO Xiaoman;LIU Yawen;ZHANG Junmei;JIANG Luxiang;GUO Na;WANG Zuwu(Shandong Power Engineering Consulting Institute Co.,Ltd.,Jinan250013,China;School of Resources and Environmental Science,Wuhan University,Wuhan430000,China)
出处
《洁净煤技术》
CAS
北大核心
2021年第5期98-105,共8页
Clean Coal Technology
基金
山东电力工程咨询院重点科技资助项目。
关键词
超低排放
燃煤电厂
污染物净化装置
脱汞效率
ultra-low emission
coal-fired power plant
pollutant purification device
mercury removal efficiency
作者简介
曹晓满(1981-),男,湖北当阳人,高级工程师,硕士,主要从事环保和新能源工程的设计和研究工作。Email:mondy825@126.com;通讯作者:王祖武,教授,博士,主要研究方向为大气复合污染控制。E-mail:zwwang@whu.edu.cn。
