应用低压撞击器分别对某50 MW和100 MW燃煤机组锅炉除尘器前后飞灰颗粒进行采样,研究了除尘器前后煤灰颗粒的排放特性及元素分布特征,对颗粒物形成机理进行了探讨.结果表明,粒径小于0.377μm颗粒可能是通过气化-凝结机理形成,煤灰中元素Na、Mg、S、Gu、Zn和Pb约有10%～30%分布在粒径小于0.377μm颗粒中,元素Al、Si和Ca相应的值只有1%左右,元素Fe、Cr和Mn相应的值约为3%～8%.两台锅炉除尘器入口和出口PM10的质量粒径呈双峰分布,其峰值分别在0.1 μm和4μm左右.除尘器对不同粒径颗粒除尘效果的不同导致了除尘器入、出口处颗粒组成特征的明显不同.
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