燃煤飞灰粒径分布函数的分形特征及其对吸附性能的影响  

FRACTAL CHARACTERISTICS OF PARTICLE-SIZE-DISTRIBUTION-FUNCTION OF FLY ASH AND ITS IMPACTS TO SELF-ADSORPTION OF FLY ASH

作　　者：王立刚[1] 徐雪[1] 王凡[2] 陈昌和[3] 

机构地区：[1]北京科技大学热能工程系,北京100083 [2]中国环境科学研究院,北京100012 [3]清华大学热能工程系,北京100084

出　　处：《环境化学》2008年第2期215-217,共3页Environmental Chemistry

基　　金：国家重点基础研究发展计划(973计划)(2006CB200301);国家自然科学基金(50306010)资助项目

摘　　要：应用分形几何原理,研究了飞灰颗粒的粒径分布特征及其粒径的分形分布函数,并将分形维数作为描述飞灰颗粒粒径分布的特征参数,从而建立了飞灰粒径分布特征及其与重金属吸附能力的量化关系.应用分形分布函数讨论了不同粒径分布的飞灰颗粒对燃煤烟道气中汞的自吸附脱除效应.利用粒径分布分维数可以定量研究不同粒径分布的飞灰颗粒系统中重金属污染物的吸附能力.Fly ash can be regard as synthetic particle system and its particle-size-distribution presents the characteristics of fractal. Traditional characteristic parameter specific-surface-area could not reflect the adsorption ability of fly ash particle systems which have different particle-size-distribution completely. Fractal characteristics of particle-size-distribution-function of fly ash are studied in this paper by using the theories of fractal geometry. Fractal dimension is chosen as a parameter to describe the characteristics of fly ash particle size distribution. Fractal-distribution-func- tion of fly ash which establishes the quantity relationship between fractal characteristics of particle size and its adsorption ability is given subsequently. The self-adsorption-effect of fly ash particle to mercury in flue gas are discussed by using the fractal-distribution-function. Fractal dimension of particle-size-distribution is put forward in this study for investigation the fly ash adsorption ability of heavy metal in quantity.

关 键 词：飞灰 粒径分布 分形分布函数 重金属 

分 类 号：X513[环境科学与工程—环境工程]