18m高密度循环流化床提升管反应器内气-固流动轴向分布特性  

Axial Distribution of Gas-Solid Two Phases in an 18m High-Density Circulating Fluidized Bed Riser Reactor

作　　者：苏鑫[1] 王成秀[1] 蓝兴英[1] 高金森[1] SU Xin,WANG Chengxiu,LAN Xingying,GAO Jinsen(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,Chin)

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《石油学报（石油加工）》2018年第3期500-506,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金重点项目(91534204);国家自然科学基金青年基金项目(21506253);中国石油大学(北京)科研基金项目(2462014YJRC018)资助

摘　　要：以18m提升管反应器为研究对象,基于压力数据研究了提升管内的气-固流动轴向分布特性。该18m实验装置操作弹性较大,当表观气速为5~9m/s时,颗粒循环速率可以在150~550kg/(m^2·s)之间控制操作。在表观气速为5m/s,颗粒循环速率达到400kg/(m^2·s)以上时,提升管反应器所有轴向高度的平均固含率均在0.1以上,表明整个提升管反应器达到了高密度操作状态。提升管内固含率的轴向分布呈指数型分布特点,与多段式分布特性存在一定的差异。此外,系统研究了操作条件对固含率轴向分布的影响。结果表明,颗粒循环速率的增加或表观气速的降低,均有助于提高提升管内各截面的固含率。The axial distribution of gas-solid two phases was studied in a circulating fluidized bed（CFB）riser with 18 min height which is as high as an industrial fluid catalytic cracking（FCC）operation unit.Solid holdups were obtained according to the pressure drop data with different solid circulation rates from 150 to 550 kg/（m^2·s）and superficial gas velocities from 5 to 9 m/s.Solid holdup can reach up to more than 10% when solid circulation rate is more than 400 kg/（m^2·s）at a fixed superficial gas velocity of 5 m/s.It can be concluded that the high-density operation in the entire riser reactor has been achieved.The axial distribution of solid holdup presents an exponential type characteristic which is different from the former results of multi-stage distributions with several different zones along the riser.Effects of operating conditions on the axial distribution of solid holdup were also studied.Results indicate that solid holdup increases by increasing the solid circulation rate or decreasing the superficial gas velocity.

关 键 词：高密度 固含率 轴向分布 提升管 循环流化床 

分 类 号：TQ021.1[化学工程]