大颗粒振动流化床与水平管平均传热特性研究  

A Study of the Characteristics of Average Heat Transfer Between a Big-particle Dominated Vibrating Fluidized Bed and Horizontal Tubes

作　　者：朱学军[1] 叶世超[1] 石进霞[1] 杨冰释[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《热能动力工程》2008年第4期387-390,共4页Journal of Engineering for Thermal Energy and Power

摘　　要：在二维流化床(240mm×80mm)中,以平均粒径dp为0.71、1.83mm的玻璃珠和1.66mm的小米为物料,研究了振动流化床与浸没水平管间传热规律;考察了气速、振动频率、床高和水平管管径等因素对平均传热系数的影响。结果表明:随着振动频率的增加最佳的气速可以降低,随着气速的增加最佳振动频率同样可以降低;平均传热系数随颗粒粒径减小而增加;颗粒热物理性质和管径对平均传热系数也有较大影响。通过实验数据得到了计算平均传热系数的关联式,计算值与实验值吻合较好,误差在±10%范围内。结果可为带浸没水平管的振动流化床设计和研究提供参考。In a two-dimensional fluidized bed (240 mm×80 mm),with glass beads of average diameters dp of 0.71 mm and 1.83 mm and millet of 1.66 mm diameter serving as materials,studied was the heat transfer law between the vibrating fluidized bed and submerged horizontal tubes. The influence of such factors as gas flow speed,vibration frequency,bed height and diameters of horizontal tubes etc. on the average heat transfer coefficient was investigated. The results of the study show that with an increase of the vibration frequency,the optimum gas flow speed will decrease,and with an increase of the gas flow speed,the optimum vibration frequency will also go down. The average heat transfer coefficient will increase with a decrease of the particle diameter. The particle thermo-physical properties and the tube diameter also have a relatively big influence on the average heat transfer coefficient. From the test data,a correlation formula for the calculation of the average heat transfer coefficient has been obtained. The calculation values have been in relatively good agreement with the test ones,and the calculation error is within a range of ±10%. The above results can serve as reference data for the design and study of vibrating fluidized beds fitted with submerged horizontal tubes.

关 键 词：振动流化床 平均传热系数 颗粒物性 最小流化速度 

分 类 号：TQ021.3[化学工程]