燃煤电站汞排放量的预测模型

Forecasting Model for Mercury Emission by Coal-fired Power Plants

燃煤电站排放汞是主要的汞污染源之一.从煤中汞含量分布、锅炉燃煤过程以及燃烧之后的各个过程来预测汞排放量.影响燃煤电站汞排放的主要因素有煤中汞含量,电站锅炉炉型,锅炉运行条件,所采用的烟气清洁装置包括颗粒脱除装置和脱硫装置的类型.利用文献资料中的统计数据归纳得到汞排放修正因子,同时利用其结果简略估算了中国燃煤电站的年汞排放量.1999～2003年中国燃煤电站的大气汞排放量年平均增长率达到了9.59%,向废渣中排放的汞量年平均增长率为8.49%,尤其是从2002年～2003年的涨幅最大,2003年燃煤电站向大气的汞排放量达到了86.8 t之多,废渣汞排放量为28.94 t.

Mercury emitted by power plants is one of the main pollution sources of mercury emission. How to forecast mercury emission according to the mercury content in the coal, the boiler combustion process and the treatment after combustion is being discussed. The main influencing factors are the coal＇s mercury content, the furnace type, the boiler＇s operating condition and the flue gas cleaning installation including various types of dust separators and desulphurizers. An emission correction factor is obtained by summarizing statistical reference data, and used for roughly estimating the yearly total mercury emitted by Chinese coal fired power plants. The average yearly growth rate of mercury emitted into the atmosphere by Chinese coal fired power plants between 1999 to 2003 was 9.59%, while that which went with the waste slag was 8.49%. Especially from 2002 to 2003, the growth rate got to a maximum. The total amount of mercury emitted into atmosphere by coal fired power plants in 2003 was as much as 86.8 tons, while that which went with the waste slag was 28.94 tons. Figs 4, tables 4 and refs 19.