1000MW超超临界燃煤机组汞排放特征  

Emission Characteristics of Mercury in 1000MW Ultra-supercritical Coal-fired Unit

作　　者：张翼 叶云云 顾永正 张青松 史晓宏 张帅 王家伟[5] 汪涛[5] 张永生[5] ZHANG Yi;YE Yunyun;GU Yongzheng;ZHANG Qingsong;SHI Xiaohong;ZHANG Shuai;WANG Jiawei;WANG Tao;ZHANG Yongsheng(National Energy Investment Group Co.,Ltd.,Dongcheng District,Beijing 100011,China;Shenhua Guohua Shouguang Power Generation Co.Ltd.,Weifang 262714,Shandong Province,China;Guohua Electric Power Branch,China Shenhua Energy Co.,Ltd.,Chaoyang District,Beijing 100025,China;Shenhua Guohua(Beijing)Eletric Power Research Institute Co.Ltd.,Chaoyang District,Beijing 100018,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]国家能源投资集团有限责任公司,北京市东城区100011 [2]神华国华寿光发电有限责任公司,山东省潍坊市262714 [3]中国神华能源股份有限公司国华电力分公司,北京市朝阳区100025 [4]神华国华(北京)电力研究院有限公司,北京市朝阳区100018 [5]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2021年第20期7039-7045,共7页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0600205)。

摘　　要：为探究1000MW超超临界燃煤机组汞的排放特性,针对国华寿光电厂2号1000MW超超临界燃煤机组,采用安大略方法(Ontario hydro method,OHM)法对烟气污染物控制设备6个点位(选择性催化还原系统(selectivecatalytic reduction,SCR)前后、静电除尘器(eletrostatic precipitator,ESP)前后、湿法烟气脱硫系统(wet flue gas desulfurization,WFGD)前后)开展了颗粒态、氧化态、零价态以及总汞测量。研究表明,在45%负荷下,SCR前入口汞浓度为11.47μg/m^(3),催化剂促进零价汞氧化,ESP出口汞浓度为2.7μg/m^(3);经过脱硫和湿除系统后,汞的最终排放浓度降到0.34μg/m^(3),污染物控制设备对汞的总脱除效率为97.07%;从SCR到ESP,汞的脱除效率为76.44%,脱硫和湿除对汞的脱除效率为20.63%。在100%负荷下,最终排放汞浓度为0.56μg/m^(3),污染物控制设备对汞的总脱除效率为92.62%。基于质量平衡分析,发现低负荷时富集在飞灰中汞的比例降低,而石膏中的比例升高,可知在低负荷情况下,汞的排放浓度更低,且更易富集在石膏之中。In order to explore the mercury emission characteristics of 1000 MW ultra-supercritical coal-fired units,OHM method was used to measure the particulate mercury,elemental mercury,and oxidation mercury in flue gas before and after selective catalytic reduction(SCR),before and after eletrostatic precipitator(ESP),as well as before and after wet flue gas desulfurization(WFGD) of Shouguang ultrasupercritical coal-fired power plant 1000 MW unit.At 45% load,the mercury concentration at the front of the SCR was 11.47μg/m^(3),catalyst promotes Hg0 oxidation,and the mercury concentration at the ESP outlet was 2.7μg/m^(3).After the desulfurization system and the WESP system,the final emission concentration of mercury decreased to 0.34 μg/m^(3).The total removal efficiency of mercury by the APCDs was 97.07%.From SCR to ESP,the removal efficiency of mercury was 76.44%,the removal efficiency of mercury by desulfurization and WESP was 20.63%.At 100% load,the final mercury emission concentration was 0.56μg/m^(3),and the total removal efficiency of mercury by the APCDs was 92.62%.Based on the mass balance analysis,at low load situation,the proportion of mercury enriched in fly ash decreased while that in gypsum increases.It shows that under low load conditions,the mercury emission is lower and mercury is more likely to be concentrated in gypsum.

关 键 词：汞 排放 超超临界 燃煤机组 

分 类 号：X773[环境科学与工程—环境工程]