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中文摘要：
应用低压撞击器分别对某50MW和100MW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一凝结机理形成，煤灰中元素Na、Mg、S、Cu、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0．1μm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。
英文摘要：
By using low pressure impactor, fly ash were sampled at the inlet and outlet of venture scrubber and ESP in a 50 MW and 100 MW utility boiler. The formation mechanism, emission and elemental partition characteristics of fly ash were investigated. The results indicate that the ash smaller than 0.377 μm are formed via nucleation of vaporized ash components, the elements Si, Al and Ca have a lower concentration in submicron mode （the fraction is about 1%）, the elements Na, Mg, S, Cu, Pb, and Zn generally show 10% to 20% mass less than 0.377 μm, and about 3% to 8% of the elements Fe, Cr and Mn appears in submicron mode. A similar bimodal distribution of PM10 was obtained in the boilers studied, the small and large mode is formed at 0.1 μm and 4.0 μm, respectively. Venture scrubber and ESP have different collection efficiency for different size particles, which results in different particles distribution characteristic in the entrance and exit of venture scrubber and ESP.
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