气固流化床中双组分混合颗粒密相床的膨胀  

Bed Expansion in the Dense Phase of Binary Mixture Particle in Gas-Solid Fluidized Beds

作　　者：刘伟伟[1] 范怡平[1] 卢春喜[1] 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《高校化学工程学报》2009年第2期210-215,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金重大项目(20490200);国家杰出青年科学基金(20525621)

摘　　要：在一套Φ500mm×12500mm大型冷模实验装置上对大差异双组分混合颗粒体系的密相床床膨胀规律进行了实验研究,考察了表观气速、床层高径比和小颗粒质量分率对混合颗粒体系床膨胀的影响。实验结果表明:基于空隙率表示的床膨胀系数随床层高径比的增大而减小,在床层高径比为2.4后基本不再变化;小颗粒质量分率在0.4附近时,基于空隙率的床膨胀系数达到一最小值。通过对实验数据的分析,得到了基于空隙率的床膨胀系数的数学模型,模型计算值与实验值吻合较好。Using directly mixing the low temperature spent catalyst with high temperature regenerated catalyst of heavy oil fluidized catalytic cracking, a new combined fluidized-bed regenerator for process of clean gasoline production has been brought forward to solve the energy unbalance caused by the low yield of coke on the catalyst. The bed expansion in the dense phase of binary mixture particle was studied experimentally in a large scale cold model of Perspex experimental equipment with φ500mm×12500 mm; and then the effects of gas superficial velocity, bed aspect ratio and mass fraction of fine particle on bed expansion of binary mixture particle were investigated. The results show that the bed expansion coefficient based on voidage decreases with the decrease of bed aspect ratio; when mass fraction of fine particle is about 0.4, the bed expansion coefficient reaches a minimum. Based on the analysis of experimental data, a mathematical model of bed expansion coefficient of binary mixture particle was established, and the calculated values are in good agreement with that of the experimental.

关 键 词：双组分混合颗粒 床膨胀系数 床层高径比 小颗粒质量分率 

分 类 号：TQ028.9[化学工程] TQ051.13