燃煤电厂现有烟气净化设备脱汞特性分析

摘要

为了解某燃烧褐煤电厂现有脱硫、脱硝、除尘器等烟气净化设备对汞的脱除特性.采用安大略法(OHM法)和冷原子吸收光谱分析法测试了该电厂褐煤燃烧过程以及烟气排放中的零价汞(Hg0)、氧化态汞(Hg2+)、颗粒态汞(Hgp)和总汞(HgT)的质量浓度.结果表明:选择性催化还原脱硝设备对汞的脱除效果不明显;除尘器对于颗粒态汞具有一定的脱除作用;脱硫设备主要脱除烟气中的氧化态汞;电厂现有设备对汞的脱除率仅为33.94％.%In order to study the mercury emission characteristics and mercury removal properties of the existing flue gas purification devices (such as desulfurization/denitration/dust removal equipments) in a lignite coal-fired power plant,the Ontario (OHM) method and the cold atomic absorption spectrum analysis method were employed to detect the concentration of zero-valent mercury (Hg0),oxidation state mercury (Hg2+),particle state mercury (Hgp) and total Hg (HgT) in the flue gas during combustion and gas emission.The results show that,the SCR denitration device's mercury removal effect was not obvious,the dust collector had a certain removal effect for the particle state mercury,and the desulfurization equipment mainly removed the oxidation state mercury in the flue gas.Therefore,the mercury removal efficiency of the existing flue gas purification device in coal-fired power plants is not very high (only 33.94％).