目前燃煤电厂烟气汞的治理主要依靠常规污染物净化装置协同脱除。为了解我国超低排放电厂污染物净化设施的协同脱汞能力，对电厂汞排放现场测试数据进行统计分析。研究发现相同类型的污染物净化设施对汞的脱除能力有很大差别，选择性催化还原法（SCR）的汞氧化效率在13.2%～91.1%，平均氧化效率为52.7%；不同类型除尘器对汞的去除效果差异很大，其中低低温电除尘器（LLT-ESP）>电袋除尘器（ESP+FF）>普通电除尘器（ESP）。湿式石灰石-石膏法（WFGD）脱硫系统脱汞平均脱汞效率为54.3%，大部分WFGD的脱汞效率主要由Hg²⁺的去除贡献得到。不同超低排放改造技术路线中以低低温电除尘器为核心的技术路线的平均脱汞效率最高，为91.3%。超低排放改造后机组的平均脱汞效率为80.1%，相比改造前提高约10%。

The treatment of mercury in flue gas of coal-fired power plants mainly relies on the collaborative removal of conventional pollutant purification devices. In order to understand the collaborative mercury removal capacity of pollutant purification facilities in ultra-low emission power plants in China,the field test data of mercury emission from power plants were statistically analyzed. The results reveal that the same type of pollutant purification facilities also have very different mercury removal capabilities. The mercury oxidation efficiency of selective catalytic reduction(SCR）is between 13.2% and 91.1%,and the average mercury oxidation efficiency is 52.7%. Different kinds of dust collectors show different mercury removal efficiency. Among them,LLT-ESP has the best mercury removal efficiency,followed by ESP+FF and ESP. The average mercury removal efficiency of wet limestone gypsum desulfurization system(WFGD）is 54.3%,which is mainly derived from the removal of Hg²⁺. The technical route with LLT-ESP as the core has the highest average mercury removal efficiency in different routes,which is 91.3%. The average mercury removal efficiency of the unit after ultra-low emission transformation is 80.1%,which is about 10% higher than that before transformation.

0 引言

1 超低排放改造技术

2 超低排放电厂净烟气汞排放达标现状

3 不同污染物净化装置协同脱汞的影响

   3.1 SCR协同脱汞现状

   3.2 除尘器协同脱汞现状

   3.3 WFGD协同脱汞现状

4 不同技术路线超低排放电厂脱汞效率比较

5 结语与展望