摘要
以安装燃煤烟气汞在线监测系统的上海外高桥第一发电厂机组A和机组B烟气汞含量为研究对象，对2台机组汞监测值的差异进行原因分析。燃煤煤种、机组结构、现有污染物控制设备以及烟气条件等都会影响烟气汞含量及其形态分布。机组A和机组B的不同在于机组A安装有布袋除尘器，而机组B安装有静电除尘器。在燃煤煤种相同时，机组A负荷为55％，机组B负荷为35％，湿法脱硫后机组A烟气气态总汞含量明显低于机组B烟气气态总汞含量。其中，机组A烟气中元素汞约占总汞的71％～81％，机组B烟气中元素汞约占总汞的76％～88％。机组A装备的布袋除尘器表现出更好的汞脱除效果。因为烟气汞具有富集在细颗粒物上的趋势，布袋除尘器截留细颗粒物的效果更好。此外通过监测的数据发现，煤种的变化对烟气汞含量影响比较明显。
Flue gas mercury contents of electric power generation unit A and unit B are studied, which are installed with flue gas mercury online monitoring system at the outlet of FGD. Coal type, unit construction, the existing air pollution control devices as well as unit load affect the mercury content and its speciation. The difference between unit A and unit B is that it is bag filter installed on unit A and ESP in unit B. When the coal type was the same, the unit load of unit A was 55%, that of unit B was 35%, the total gaseous mercury content of unit A was evidently lower than that of unit B. Besides, for unit A monthly average data, the proportion of Hg0 reached about 71%-81%, and 76%-88% for that of unit B. The bag filter installed on unit A showed better mercury removal performance. Because the flue gas mercury had a trend of accumulating in fine fly ash particles and then mostly be captured by the bag filter. It also showed that coal type change had an obvious effect on flue gas mercury content.
出处
《锅炉技术》
北大核心
2015年第5期15-19,共5页
Boiler Technology
