物料自由下落过程产尘率影响因素分析  

Influence Factor Analysis on Dust Forming Rate in a Free Falling Process

作　　者：屈欣瑞 任晓芬 王怡[1] 段梦婕[1] QU Xinrui;REN Xiaofen;WANG Yi;DUAN Mengjie(School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology;College of Energy and Environmental Engineering, Hebei University of Engineering)

机构地区：[1]西安建筑科技大学环境与市政工程学院 [2]河北工程大学能源与环境工程学院

出　　处：《建筑热能通风空调》2017年第11期37-40,共4页Building Energy & Environment

基　　金：国家自然科学基金重点项目(51238010);国家自然科学基金青年基金项目(51608164)

摘　　要：本文通过改变接触面的方法,将总产尘分为下落过程中随气流逃逸的一次尘和与接触面碰撞过程中产生的二次尘两部分,用实验的方法,研究了两组不同粒径分布的物料在下落高度、出流流量变化时,一次尘、二次尘、总产尘的变化规律。实验结果表明,不同粒径分布的物料其产尘情况差异较大,两组物料随下落高度及出流口径的变化趋势一致。一次产尘率、二次产尘率、总产尘率均随下落高度的增大而增大,随出流口径的增大而减小。An experiment of bulk material free falling process influenced by multiple factors is investigated.Dust was divided into two parts by changing contact surfaces:the first fugitive dust caused by escaping during free falling and the second fugitive dust caused by collision with surface.Thus first fugitive dust rate,second fugitive dust rate and general fugitive dust rate produced by two group of materials whose median diameter is different is studied.These three fugitive dust rate influenced by drop height and hopper outlet diameter could be explored.The results show that fugitive dust rate varies while material’s median diameter is different.The first fugitive dust rate,second fugitive dust rate and total fugitive dust rate increase while drop height increases,decrease while hopper outlet diameter increases.

关 键 词：自由下落 产尘率 一次尘 二次尘 

分 类 号：TU834.6[建筑科学—供热、供燃气、通风及空调工程]