大差异颗粒双组分流化床颗粒传热实验  

EXPERIMENT ON HEAT TRANSFER CHARACTERISTICS OF GREAT DIFFERENT PARTICLES IN BINARY GAS-SOLID FLUIDIZATION BED

作　　者：孔行健[1] 孙国刚[1] 王茂辉[1] 

机构地区：[1]中国石油大学重质油加工国家重点实验室,北京102249

出　　处：《石油学报（石油加工）》2009年第6期790-795,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(20490200)资助

摘　　要：以降烯烃催化剂作为大颗粒,FCC催化剂作为小颗粒,将冷的大颗粒加入至热的大、小颗粒双组分全混流化床中,考察流化床中颗粒间混合换热过程。结果表明,在全混流化状态下,流化床密相区内混合颗粒的平均粒径越小、床层气速越高和床温越高,冷、热颗粒间传热系数就越大。用颗粒的努塞尔数Nup和雷诺数Rep关联试验数据时,必须考虑密相床层温度的影响。考虑换热的初始床温和冷颗粒温度后,关联式计算值与实验值的误差不超过30%,可用于双组分流化床颗粒传热系数的计算。With an olefin-reducing catalyst as the large particle and FCC catalyst as the small particle, an experimental investigation on heat transfer characteristics of feeding cold large particles into the heated fluidized binary mixtures of small particles and large particles was conducted in a experimental hot fluidized bed. The particle-particle heat transfer coefficient was measured under operations of different fluidized gas velocities, bed temperatures and large particle mass ratio in bed mixture. The experiments showed that the heat transfer coefficient increased with the increase of fluidized bed temperature, superficial gas velocity and with the decrease of the average particle size of bed binary mixture when the binary mixtures was in full-mixed fluidized state. A new correlation between Nup and Rep of the particles, involving the influences of the temperatures of initial bed mixture and cold feed particle, was put forward, which could predict the experimental data with the error less than 30%.

关 键 词：双组分流化床 大差异颗粒 颗粒-颗粒传热 

分 类 号：TQ05[化学工程]