超细粉在导向管喷动床中的固体循环速率  

SOLIDS CIRCULATION RATE OF ULTRA-FINE POWDERS IN SPOUTED BED WITH DRAFT TUBE

作　　者：周勇[1] 马兰[1] 石炎福[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《化工学报》2004年第9期1532-1536,共5页CIESC Journal

基　　金：国家自然科学基金资助项目 (No 2 0 1760 3 1)~~

摘　　要：Ultra-fine powders are difficult to be fluidized due to the strong particle to particle cohesiveness.However,the authors’experiments showed that the ultra-fine powder CaCO 3 could be stably fluidized in a spouted bed with a draft tube.The effects of geometric and operating parameters on solid circulation rate of ultra-fine powder CaCO 3 were investigated in a 120 mm diameter transparent semicircular spouted bed with a draft tube.Three draft tubes with different sizes were used in this study.It was found that the solids circulation rate was mainly dependent on the drawing rate of the gas jet from the nozzle, then on the gas transport capacity in the draft tube.With increasing gas feed rate, distance between the nozzle and the draft tube inlet and draft tube diameter,the solids circulation rate could be increased.Based on the jet theory,a quantitative correlation was proposed for predicting the solid circulation rate of ultra-fine powders in a spouted bed with a draft tube by taking into account the gas transport capacity in the draft tube.Ultra-fine powders are difficult to be fluidized due to the strong particle to particle cohesiveness. However, the authors' experiments showed that the ultra-fine powder CaCO3 could be stably fluidized in a spouted bed with a draft tube. The effects of geometric and operating parameters on solid circulation rate of ultra-fine powder CaCO3 were investigated in a 120 mm diameter transparent semicircular spouted bed with a draft tube. Three draft tubes with different sizes were used in this study. It was found that the solids circulation rate was mainly dependent on the drawing rate of the gas jet from the nozzle, then on the gas transport capacity in the draft tube. With increasing gas feed rate, distance between the nozzle and the draft tube inlet and draft tube diameter, the solids circulation rate could be increased. Based on the jet theory, a quantitative correlation was proposed for predicting the solid circulation rate of ultra-fine powders in a spouted bed with a draft tube by taking into account the gas transport capacity in the draft tube.

关 键 词：超细粉 导向管喷动床 固体循环速率 

分 类 号：TQ021[化学工程]