对2家燃煤电厂湿法烟气脱硫(wet flue gas desulfurization,WFGD)系统前后细颗粒及SO_3酸雾进行了测试分析,对比分析了单塔、双塔脱硫工艺、燃煤组分等与细颗粒物和SO_3酸雾脱除作用的关系。结果表明,双塔WFGD系统对细颗粒物和SO_3酸雾的脱除效率明显高于单塔系统。WFGD系统入口细颗粒物粒径分布相似,脱硫后细颗粒物粒径分布向小粒径方向迁移,同时PM_(2.5)相对比例有所增加,双塔脱硫系统更为明显。WFGD系统在脱除燃煤烟气中颗粒物的同时,本身也会形成新的细颗粒物,其主要成分为硫酸钙,呈板状及棱柱状。单塔、双塔WFGD系统对燃煤烟气中SO_3酸雾的脱除效率范围分别介于30%~40%、50%~65%,随着塔入口烟气中SO_3及颗粒物浓度的增加,其脱除效率有所提高;燃用高硫煤时,会出现蓝烟现象。
【英文摘要】
Fine particles and SO_3 acid mist from the inlet and the outlet of the wet flue gas desulfurization(WFGD) systems in two coal-fired power plants were measured and the effects of different technologies and coal qualities on the removal of fine particles and SO_3 acid mist were investigated. The results show that the removal efficiencies of fine particles and SO_3 acid mist in the double-tower system are obviously higher than those in the single-tower system. The size distributions of fine particles at the in...
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