燃煤电厂脱硫灰渣理化特性研究

以徐州2个不同工艺电厂脱硫灰渣为研究对象，分别从粒径分布、重金属含量、矿物组成和微观颗粒形态4个方面，对灰渣进行了研究。结果显示：2个电厂飞灰的粒径分布相似，粒径主要集中于5μm以下，粒径在20μm以下的颗粒占全部颗粒的98％以上；所测试的重金属元素中，除Cd外，其他元素含量都在1μg／g以上。Mn的测试含量最高，均在300μg／g以上。多数重金属元素更易富集在细灰上；2个电厂灰渣的矿物组成特性稍有不同，主要区别表现在莫来石和CaSO4的相对含量上，这主要与电厂工艺和燃烧的煤质有关。另外，2个电厂的飞灰微观颗粒形态存在明显差异。

Study on the physicochemical properties of desulfurization ash from coal fired power plant

Desulfurization ashes from different coal fired power plant in Xuzhou were studied in three aspects including granularity distribution, content of heavy metals and mineral composing. The results showed that granularity distribution was similar in the two power plants, granularity was mainly under 5 microns, the content of granule above 20microns was more than 98% ; The contents of heavy metals tested were all above 1μg/g except Cd, Mn had the highest content above 300μg/g. Most of the heavy metals tested were reliable to enrich in fly ash; The mineral composition differed from the relative content of mullite and calcium sulphate, it was related to the technics and coal used of power plant. The particle morphology of each plants fly ash had distinct differences.