摘要
采用国际上通用的安大略方法对两燃煤电站安装的烟气湿法脱硫装置和新式整体半干法脱硫装置前、后的烟气进行采样,并且对循环床燃煤电站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的质量分数,应用全自动汞分析仪测定固体样品中的汞质量分数.由汞平衡得出各个环节中的汞所占的份额,分析了湿法、半干法和循环床炉内燃烧脱硫技术脱除烟气中汞的特性.结果表明:在煤粉炉燃煤电站中,烟气中的汞主要以气态汞的形态存在;在循环流化床锅炉燃煤电站中,烟气中的汞主要以颗粒态的形态存在.通过计算各种灰的富集因子可知,汞在底灰中是耗散的,在DC灰、ESP灰、混合灰和脱硫产物中是富集的.在脱除烟气中汞的性能方面,循环床炉内燃烧脱硫技术的脱汞率分别大于新式整体半干法脱硫系统和烟气湿法脱硫系统的脱汞率,且新式整体半干法脱硫系统的脱汞率大于烟气湿法脱硫系统的脱汞率.
By applying the ontario hydro method （OHM） and the US EPA standard methods, the flue gas mercury sampling was carried out before and after wet flue gas desulphurization and novel integrated desulphurization semi-desulphurization, respectively, in two coal-fired power plants. Various mercury speciations, such as Hg^0, Hg^2＋ and Hg^P in flue gas, were analyzed. The flue gas mercury sampling before and after electrostatic precipitator of circulating fluidized bed combustion was also done and analyzed. The solid samples, such as coal, bottom ash, electrostatic precipitator （ESP） ash and desulphurization product, were analyzed by DMA80. According to mercury balance, mercury speciation and its distribution at different locations downstream the flue gas were obtained. The research results show that mercury mainly exist in the form of gaseous state in a pulverized coal-fired power plant, while it mainly exists in the form of particle-bound mercury in a circulating fluidized bed coal-fired power plant. Generally, mercury in the bottom ash is dissipative, while it is rich in dust collector （DC） ash, ESP ash, mixed ash and desulphurization product. The circulating fluidized bed combustion furnace de- sulphurization system shows the highest mercury removal efficiency, while the wet flue gas desulphurization system the lowest.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2009年第4期368-373,共6页
Journal of Combustion Science and Technology
基金
国家重点基础研究发展计划(973)资助项目(2006CB200304)
关键词
燃煤电站
汞
湿法烟气脱硫
半干法烟气脱硫
循环床炉内脱硫
coal-fired power plant
mercury
wet flue gas desulphurization （WFGD）
semi-dry flue gas desulphurization
furnace desulphurization in circulating fluidized bed
