环隙气升式气固环流反应器内颗粒速度特性  

Characteristics of Solids Velocity in an Annulus-Lifted Gas-Solid Loop Reactor

作　　者：朱效明[1] 刘梦溪[1] 卢春喜[1] 王祝安[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：《化学反应工程与工艺》2008年第4期295-300,共6页Chemical Reaction Engineering and Technology

摘　　要：针对中心气升式气固环流反应器在工业化中暴露出来的问题,提出了一种新型的环隙气升式气固环流反应器.并建立了一套大型的冷态实验装置(装置总高4.56 m,环流反应器筒体外径300 mm)来考察环隙气升式气固环流反应器内颗粒速度特性。操作条件为环隙区表观气速0.10～0.54 m/s,导流筒区表观气速0.059～0.200 m/s。分别测量了环流反应器环流段内颗粒的密度和速度,基于实验数据对催化剂颗粒的运动速度和环流推动力进行系统分析。结果表明,环隙区颗粒分布形式为"中心稀两边浓";环隙气升式气固环流反应器内,颗粒环流速度随着环隙区表观气速的增大而增大,而环流速度梯度逐步减小。随着导流筒高径比 H/D 的增大,环隙气升式气固环流反应器的环流推动力增大而颗粒环流速度减小。A novel gas-solid annulus-lifted air loop reactor （GSALLR） was proposed in order to overcome the shortcomings of commercialized draft tube-lifted air loop reactor. A cold model experimental apparatus with outside diameter 300 mm and height 4560 mm was established and three kinds of draft tubes with different height were employed respectively. The GSALLR was operated under the conditions with superficial gas velocity in annulus varying from 0.10 to 0.54 m/s and 0.059 to 0.200 m/s in draft tubes. The bed density and the catalyst velocity were measured. Based on the experimental data, the particle velocity distribution and driving force of circulation were systematically analyzed, The experimental results showed that the solid circulation velocity in the gas-solid annulus-lifted air loop reactor increased with the increasing of superficial gas velocity in the annular region, but the velocity gradient of solids decreased gradually. The circulation driving force of GSALLR with higher ratio of height to diameter （H/D） was stronger than GSALLR with lower H/D; Conversely, the circulation velocity of solids in GSALLR decreased with the increasing of HID.

关 键 词：环隙气升式 环流反应器 导流筒 颗粒循环速率 

分 类 号：TQ051[化学工程]