干污泥颗粒在振动流化床中的流体力学和水平管的传热特性  

Hydrodynamics and Heat Transfer Characteristics of Dried Sludge Particles in Vibration Fluidized Bed

作　　者：范辞冬[1] 王锐思[1] 叶世超[1] 齐亚兵[1] 蔡婧菁[1] 谢(王争) 吴振元[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《化学反应工程与工艺》2010年第2期131-135,共5页Chemical Reaction Engineering and Technology

摘　　要：在240mm×80mm振动流化床中以干污泥颗粒为实验物料,研究了振动对临界流化速率和床层空隙率等流态化特征参数的影响,并考察了气速、振动频率、振幅和水平管加热功率对平均传热系数的影响。结果表明:振动的引进大大降低了颗粒的流化速率,同时提高了污泥床层空隙率。水平管的平均传热系数随气速和振动频率的增加呈先增加后减小的趋势,随振幅的增加而增加,而随水平管加热功率增加而减小。通过实验数据拟合得到平均传热系数的关联式,其计算值和实验值吻合较好。误差可控制在±10%。The effect of vibration on critical fluidization velocity and voidage in a two-dimensional fluidized bed （240 mm×80mm） was investigated with dried sludge particles as fluidized medium. The effect of different gas velocity, vibration frequency, vibration amplitude and power of tube on average heat transfer coefficient was also discussed. The results showed that the critical fluidization velocity decreased, while the voidage increased when vibration was introduced. Average heat transfer coefficient firstly increased then decreased with the increase of gas velocity or vibration frequency, and increased with the increase of amplitude, but decreased with the increase of heating power of tube. The correlation formula to calculate average heat transfer coefficient was established, and the calculated values were in good agreement with the experimental values with error ±10%.

关 键 词：干污泥颗粒 振动流化床 临界流化速率 空隙率 平均传热系数 

分 类 号：TQ021.3[化学工程] TQ051.13