220MW热电联产锅炉中痕量元素的迁移及分布特性

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本实验在北京某220Mw热电联产锅炉上进行。采用承重撞击器系统对该锅炉选择性催化还原(SCR)前、电子除尘(ESP)前以及烟气脱硫(FGD)前的颗粒物进行采集,研究了痕量元素在烟道沿程上的迁移特性,另外,还给出了痕量元素在各固体燃烧产物中的分布。结果表明:ESP前的颗粒物上As、Cd、Cr和Pb的浓度明显高于SCR前的浓度;在从SCR到ESP的过程中,As、Cd、Cr、Pb从气态迁移到固态的质量分别占到了原煤中总质量的26%、16%、12%和11%:从ESP到FGD的过程中,颗粒物上As与Cd的浓度有略微
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