摘要
燃煤电站汞排放是自然界人为汞排放的最大污染源,所以进行燃煤电站不同形态汞排放浓度的现场测试对了解和控制汞排放的规律有重要意义。采用国际上通用的Ontario Hydro方法对某600MW燃煤电站ESP前、后的烟气进行采样,应用美国EPA标准方法测定了烟气中Hg0、Hg2+和HgP的浓度,应用DMA80测定固体样品(煤、底灰、ESP飞灰)中的汞浓度。测试结果表明:烟气经过ESP前后,烟气中汞形态发生了显著变化,Hg2+的比例由14.71%变为39.54%,Hg0由85.19%变为60.38%,HgP由0.10%变为0.08%。煤中的氯,烟气中的NOx、SO2、HCl和Cl2对烟气中氧化态汞的形成呈正相关。
Mercury emissions from coal-fired power plants are regarded as the largest pollution source of man-made mercury emissions in nature. Hence,to perform an on-the-spot testing of the mercury emission concentration in various forms from a coal-fired power plant is of vital significance for understanding and controlling the law and regularity of mercury emissions. With the internationally accepted Ontario Hydro method being adopted to sample the flue gas before and after an electrostatic precipitator (ESP) in a 600 MW coal-fired power plant,the American EPA (Environmental Protection Agency) standard method was used to determine Hg0,Hg2+and HgP concentration in the flue gas,and DMA 80 was employed to ascertain the mercury concentration in solid samples (coal,bottom ash,ESP fly ash). The testing results show that when the flue gas passes through the ESP,the morphology of the mercury contained in the flue gas will undergo a remarkable change. The percentage of Hg2+ will increase from 14.71% to 39.54%,that of Hg0 will decrease from 85.19% to 60.38% and that of HgP will drop from 0.10% to 0.08%. The chlorine in coal and NOx,SO2,HCl,Cl2 in the flue gas assume a positive correlation to the formation of oxidized mercury in the flue gas.
出处
《热能动力工程》
CAS
CSCD
北大核心
2008年第4期399-403,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家重点基础研究发展计划(973)基金资助项目(2002CB211604
2006CB200300)
关键词
燃煤电站
汞形态分布
烟气
coal-fired power plant,mercury morphological distribution,flue gas
