石英砂流化床床料磨损的数学模型  

Mathematic model of attrition of quartzite particles as medium material in fluidized bed

作　　者：周陵生[1] 姜秀民[1] 刘建国[1] 王辉[1] 

机构地区：[1]上海交通大学热能工程研究所,上海200240

出　　处：《化工学报》2007年第11期2776-2781,共6页CIESC Journal

基　　金：国家自然科学基金项目(50476021)~~

摘　　要：Quartzite particles,as a bed material,are used in the high density fluidized bed.However,in the operation,a great amount of fines,due to the attrition of quartzite particles,were elutriated,which would result in the decrease of bed material and bed pressure drop,and herein have an impact on the normal fluidization in the fluidized bed.In view of the attrition of quartzite particles,a mathematic model was established based on the Fleischer’s system energy balance theory about the friction attrition mechanism.The condition that the fine particles were separated from the parent particles was based on the least energy principle of material dynamic failure.The particle’s operation characteristics in the fluidized bed and the particle’s physical properties were also considered in the model.This model could explain some factors of the particle’s attrition.Moreover,the predicted value from the model was close to the experimental value.Therefore,this study would be beneficial to the engineering application of the high density fluidized bed.Quartzite particles, as a bed material, are used in the high density fluidized bed. However, in the operation, a great amount of fines, due to the attrition of quartzite particles, were elutriated, which would result in the decrease of bed material and bed pressure drop, and herein have an impact on the normal fluidization in the fluidized bed. In view of the attrition of quartzite particles, a mathematic model was established based on the Fleischer＇ s system energy balance theory about the friction attrition mechanism. The condition that the fine particles were separated from the parent particles was based on the least energy principle of material dynamic failure. The particle＇ s operation characteristics in the fluidized bed and the particle＇s physical properties were also considered in the model. This model could explain some factors of the particle＇s attrition. Moreover, the predicted value from the model was close to the experimental value. Therefore, this study would be beneficial to the engineering application of the high density fluidized bed.

关 键 词：磨损 数学模型 流化床 石英砂 

分 类 号：TB302.1[一般工业技术—材料科学与工程]