静电除尘器对烟气汞脱除作用的实验研究

Experimental Study on the Flue Gas Mercury Removal Capability of ESP

介绍了由电厂静电除尘器对燃煤烟气汞脱除作用的现场测试得到静电除尘器进出口位置烟气汞的形态分布及静电除尘器对烟气汞的脱除效率。结果表明,静电除尘器对烟气汞的脱除效率为27.9%,以脱除烟气中氧化态汞和颗粒汞为主,对单质汞脱除效果较弱。飞灰中细颗粒(25μm～60μm)占到58.5%,其对烟气汞的吸附能力较强,使静电除尘器对烟气汞,特别是氧化态汞具有良好的脱除效果。采取措施使元素汞转化为氧化态汞,提高飞灰吸附汞的能力,是提高静电除尘器对烟气汞脱除效率的技术方向。

In order to study the effect of electrostatic precipitator（ESP） on removing flue gas mercury, the mercury speciation on ESP inlet and outlet and the removal efficiency are tested on site. As the results show, the flue gas re- moving efficiency of ESP is 27.9% , mainly effective in oxidized mercury and particulate mercury removal, but weak in elemental mercury removal. The fine particle （259？m -609？ m） accounts for 58.5% of fly ash, showing strong mercury retention ability, which makes ESP have a good effect on removing mercury, especially oxidized mercury. In order to improve the mercury retention ability of fly ash, measures are taken to transform the elemental mercury into oxidized mercury, which is the technology direction of improving flue gas mercury removal efficiency by ESP.