华电技术 ›› 2020, Vol. 42 ›› Issue (9): 69-75.

• 烟气洁净排放 • 上一篇    下一篇

超低排放燃煤机组汞的形态分布和排放研究

  

  1. 1.国网安徽省电力有限公司电力科学研究院,合肥 230601;2.中国中煤能源集团有限公司,北京 100120; 3.安徽新力电业科技咨询有限责任公司,合肥 230601
  • 出版日期:2020-09-25 发布日期:2020-09-28

Study on form distribution and emission of mercury from ultra-low emission coal-fired power plants

  1. 1.State Grid Anhui Electric Power Research Institute,Hefei 230601,China;2.China National Coal Group Company Limited,Beijing 100120,China;3.Anhui Xinli Power Technology Consulting Company Limited,Hefei 230601,China
  • Online:2020-09-25 Published:2020-09-28

摘要: 选取4台超低排放燃煤机组测试汞的质量浓度和形态分布,分析烟气净化设施对汞排放的影响,研究汞的迁移规律和排放特征。结果表明,选择性催化还原(SCR)脱硝装置对汞的直接脱除作用很小,但脱硝催化剂对Hg0的催化氧化利于下游设备的汞脱除;HgP绝大部分在静电除尘器(ESP)中被脱除;湿法脱硫(WFGD)对Hg2+有较高的脱除率;燃煤的汞主要有3个迁移方向:飞灰、脱硫副产物和大气排放;排入大气的汞以Hg0为主,总汞排放因子EFe为15.20~30.00 μg/(kW·h)。研究结果表明超低排放改造对减少烟气汞排放具有积极作用,不同技术路线改造对减少烟气汞排放的影响不同。

关键词: 超低排放, 烟气汞, 脱除率, 形态分布, 迁移规律, 排放特征, 排放因子, 脱硝催化剂

Abstract: In order to study the effects of flue gas pollutants purification facilities on mercury emission and migration characteristics, content and form distribution of mercury discharged from four ultra-low emission coal-fired units were measured. Experimental results show that selective catalytic reduction (SCR) devices only remove an insignificant amount of mercury directly, but the denitration catalyst can facilitate the mercury removal in rear devices by catalytic oxidizing Hg0.ESP would remove the majority of Hg0 ,and WFGD could effectively eliminate Hg2+ .Mercury in fire coal would transport into fly ash, by-product of WFDG and flue gas,while mercury discharged in flue gas is mainly in form of Hg0 .Mercury emission factor (EFe) was between 15.20~30.00 μg/(kW·h).The results show that the ultra-low emission transformation has a certain effect on mercury emission reduction, and the reduction is affected by technical routes of the transformation.

Key words: ultra-low emission, mercury in flue gas, removal rate, distribution of forms, migration patterns, emission characteristics, emissions factor, denitration catalyst