基于监测数据的我国燃煤电厂汞排放分析

燃煤是最大的人为汞排放源之一,我国已加强对燃煤电厂的汞排放控制要求。通过对16家燃煤电厂32台机组的汞排放情况进行全要素监测,分析总结出符合我国燃煤电厂特点的汞排放情况:我国燃煤机组中的汞质量平衡范围在70%~130%是合理的;燃烧后的汞经过烟气污染物处理设施后,70%以上进入粉煤灰和脱硫石膏,经烟气排入外环境的平均不足30%;安装SCR脱硝装置有助于烟气中汞的去除;除尘、脱硫设施对烟气中汞平均去除效率为38.5%、52.5%;各污染物控制设施对烟气中汞的总协同去除效率平均为74.1%,说明我国燃煤机组现有的污染物处理设施的协同控制对降低烟气中的汞排放有较好的作用。

ANALYSIS OF MERCURY EMISSION FOR COAL-FIRED POWER PLANTS BASED ON MONITORING MEASUREMENT

Coal combustion is one of the largest anthropogenic mercury sources，the control requirements of mercury emission from coal-fired power plants has been strengthened in China． The research summarized and analyzed the mercury emission data from 32 units of 16 coal-fired power plants in China． The results revealed that the range of mercury mass balance from 70% to 130% was reasonable; through pollution control equipment average of more than 70% mercury in the flue gas went into the fly ash and gypsum，average less than 30% mercury in the flue gas went into the external environment; SCR could promote the mercury removal efficiency; the average mercury removal efficiency of ESP/FF and FGD were 38. 5% and 52. 5% respectively; the average mercury removal efficiency through total cooperative control equipment was 74. 1%，the study illustrated cooperative control of existing coal-fired units pollutant treatment facilities had a good effect to reduce mercury emissions．