1000MW近零排放燃煤机组细颗粒物及SO_(3)排放和分布特征  

Emission and Distribution Characteristics of Fine Particulate Matter and SO_(3) in 1000MW Near-zero Emission Coal-fired Unit

作　　者：宋畅[1] 尹武昌 余学海 靳旺宗 顾永正 陈凌云 李朋[4] 王家伟[5] 汪涛[5] 吴华成[4] 张永生[5] SONG Chang;YIN Wuchang;YU Xuehai;JIN Wangzong;GU Yongzheng;CHEN Lingyun;LI Peng;WANG Jiawei;WANG Tao;WU Huacheng;ZHANG Yongsheng(China Shenhua Energy Corporation Guohua Power Branch,Chaoyang District,Beijing 100025,China;Shenhua Guohua Shouguang Power Generation,Weifang 262714,Shandong Province,China;Shenhua Guohua(Beijing)Electric Power Research Institute,Chaoyang District,Beijing 100018,China;North China Electric Power Research Institute Co.,Ltd.,Xicheng District,Beijing 100045,China;School of Energy Power And Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]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 [2]神华国华寿光发电有限责任公司,山东省潍坊市262714 [3]神华国华(北京)电力研究院有限公司,北京市朝阳区100018 [4]华北电力科学研究院有限责任公司,北京市西城区100045 [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》2022年第5期1867-1874,共8页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0600205)。

摘　　要：针对国华寿光电厂2号1000MW近零排放燃煤机组,在100%、45%负荷和不同NO_(x)排放浓度下,对烟气全流程颗粒物和SO_(3)浓度进行现场采样测试,研究了分级颗粒物中水溶性离子含量分布,并给出了前体物SO_(3)的排放特征。结果表明:不同工况下PM_(10)和PM_(2.5)排放浓度分别不超过0.92mg/m^(3)和0.24mg/m^(3);随着负荷的降低,颗粒物质量和数量浓度都出现下降,但粒径分布并未明显变化;随着NO_(x)排放浓度上升,选择性催化还原(selective catalytic reduction,SCR)后和电除尘(electrostatic precipitator,ESP)后部分粒径段颗粒物浓度出现下降,尤其是ESP后0.006~0.0138μm、0.0553~5.980μm粒径段的变化趋势较为明显。SCR前后PM_(2.5)中水溶性离子质量占比约4%,以Ca^(2+)和SO_(4)^(2-)为主,各粒径段质量分布相对均匀;湿式电除尘(wet electrostatic precipitator,WESP)前后PM_(2.5)中水溶性离子质量占比约39.5%,以Mg^(2+)、SO_(4)^(2-)、NH^(4+)为主,在<0.2μm粒径段中富集,不同负荷下烟气中SO_(3)在烟道沿程上的迁移规律基本一致,SCR和ESP会导致SO_(3)浓度增加,WFGD和WESP对SO_(3)具有吸收作用,其排放浓度为1.2~1.9mg/m^(3),综合脱除效率为45.2%~65.1%。Emission characteristics of fine particles and SO_(3)were studied in Guohua Shouguang Power Plant No.21000MW ultra-low emission coal-fired unit under 100%,45%load and different NO_(x)emission concentration,the distribution of water-soluble ion content in classified particles and the concentration of precursor SO_(3)were studied.The results show that the emission concentration of PM_(10)and PM_(2.5)under 100%and 45%load does not exceed 0.92mg/m^(3)and 0.24mg/m^(3),respectively.With the decrease of load,the quality and quantity concentration of particulate matter decreased,but the particle size distribution did not change significantly.As the NO_(x)emission concentration increased,the concentration of particulate matter in some particle size decreased after SCR and ESP,especially the 0.006~0.0138μm,0.0553~5.980μm particle size range after ESP.The water-soluble ions in the particles before and after SCR accounted for about 4%of the total mass,mainly contain Ca^(2+)and SO_(4)^(2-);which increased to 39.5%before and after WESP,mainly contain Mg^(2+),SO_(4)^(2-),NH^(4+)and enriched in particles<0.2μm.The migration of SO_(3)in flue gas under different loads is basically the same.SCR and ESP will increase the concentration of SO_(3),WFGD and WESP have an absorption effect on SO_(3),and their emission concentration is 1.2~1.9mg/m^(3).The comprehensive removal efficiency is 45.2%~65.1%.

关 键 词：燃煤机组 细颗粒物 SO_(3)水溶性离子 

分 类 号：TM61[电气工程—电力系统及自动化]