锥形喷动床中液桥力对湿颗粒流化运动的影响  

The Effects of Liquid Bridge Force on Wet Particles Fluidization Movement in Conical Spouted Bed

作　　者：李一波 朱林杭 金玉珍[1] LI Yibo;ZHU Linhang;JIN Yuzhen(Key Laboratory of Fluid Transmission Technology of Zhejiang Province,Zhejiang Sci-Tech University,Hangzhou 310018,China;State Key Lab of Clean Energy Utilization,State Environmental Protection Engineering Center for Coal-Fired Air Pollution Control,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江理工大学,流体传输系统技术国家地方联合工程实验室,杭州310018 [2]浙江大学,能源清洁利用国家重点实验室,国家环境保护燃煤大气污染控制工程技术中心,杭州310027

出　　处：《工程热物理学报》2023年第9期2423-2430,共8页Journal of Engineering Thermophysics

基　　金：浙江省重点研发计划项目(No.2019C03117)。

摘　　要：采用数值模拟的方法研究液桥力的两个因素含水量和接触角对喷动床中湿颗粒的流化特性、颗粒温度和颗粒浓度的影响。研究表明流化颗粒的数量随着喷动床高度的增加而增加。当含水量为0时,喷动床喷泉区域没有出现颗粒团聚的现象;当含水量的增加,Z方向的流速先增大后减小,在喷泉区域出现明显的团聚现象。当接触角增大时,喷泉区Z方向的流速先减小后增大,接触角为30°时流速最小。接触角越大,核心高温区域越靠近喷射区域。当接触角为30°时,颗粒运动阻力达到最大值,随气流从床层逸出的颗粒数量最少。Numerical simulations were performed to study the effects of two factors,water content and contact angle of liquid bridges,on the fluidization characteristics,particle temperature,and particle concentration of wet particles in a spouted bed.Results shows that the number of fuidized particles increases with the height of the spouted bed.When the water content is O,there is no particle agglomeration in the fountain region;as the water content increases,the flow velocity in the Z direction first increases and then decreases,and obvious agglomeration occurs in the fountain region.When the contact angle increases,the flow velocity in the Z direction first decreases and then increases,with the minimum velocity occurring when the contact angle is 30°.The larger the contact angle,the closer the core high-temperature region is to the spout region When the contact angle is 30°,the particle movement resistance reaches its maximum value,and the least number of particles escape from the bed layer with the airflow.

关 键 词：喷动床 气固两相流 含水量 接触角度 颗粒团聚 

分 类 号：TK123[动力工程及工程热物理—工程热物理]