电厂燃煤飞灰中重金属富集规律的实验研究

研究了电厂燃煤排放的４级粒径不同的飞灰中铜、钴、铅、镍、铬、镉、砷、铍的含量及其分布。发现大多数金属在粒径１μｍ左右的细微粒子中有富集特性，其变化趋势与不同飞灰的孔隙特性变化一致，即随飞灰粒径的减小，飞灰的比表面积和孔体积增大，飞灰中金属的浓度也增多。同时比较了２种工况下金属在飞灰中的不同分布，分析了影响飞灰富集特性的各种因素，如飞灰的孔隙特性、燃烧工况、化学吸附作用、矿物质的汽化－凝结作用等，并

Study on the Metal Pollutant in Fly Ash from Coal Combustion of Power Plant

he contents of & metals in fly ashes with different sizes from' coal combustion in 5 # boiler ofQinshan Power Plant have been determined, thepore and surface 'properties of the fly ashes havealso been studied. It was found that the smaller the particle is, the bigger the surface of poresand the contents of metal compounds become.Both high temperature and reducing atmosphereaccelerate the enrichment of 'heavy metals in fineparticles. The different rules in metal compoundsdistribution of the ability of absorption and 'thecondensation of vapor have been discussed.