锅炉燃煤方式对痕量元素分布的影响

The Impact of Coal Combustion Modes of a Boiler on the Distribution of Trace Elements

综述了目前国内外锅炉燃烧方式对痕量元素分布的影响。测定了我国5台不同炉型和容量的工业锅炉底灰和飞灰中痕量元素的分布情况,结果表明:流化床燃烧时煤中痕量挥发性元素的蒸发较大;不易挥发痕量元素的分布不受炉型的影响;工业锅炉容量增大时,痕量元素在细颗粒上富集;飞灰颗粒越小,富集越多。

A broad overview is given of the impact of boiler combustion modes introduced both at home and abroad on the distribution of trace elements. Measurements were taken of the distribution of trace elements in bottom ash and fly ash for five Chinese industrial boilers of different models and power ratings. The results of the measurements indicate that fluidized bed combustion can lead to an enhancement of evaporation of volatile trace elements and the distribution of trace elements not tending to volatile will not be affected by the specific type of boilers. With the increase in power capacity of industrial boilers an enrichment of trace elements can be observed in fine particles. The smaller the fly ash particle size, the higher will be the enrichment of the trace elements.