面积比及筛网对环流反应器流动与传质的影响  

Effects of area ratio and screen on hydrodynamic and mass transfer characteristics of loop reactor

作　　者：耿瑶 卢哲 刘春江[1] 刘辉[1] GENG Yao;LU Zhe;LIU Chun-jiang;LIU Hui(State Key Laboratory of Chemical Engineering,Institute of Chemical Engineering,School of Chemical Engineering and technology,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学化工学院化学工程研究所化学工程联合国家重点实验室,天津300072

出　　处：《化学工程》2020年第5期25-30,共6页Chemical Engineering(China)

基　　金：青年科学基金(21706187)。

摘　　要：通过实验考察了具有不同上升区与下降区面积比的内循环气升式环流反应器气含率、循环液速以及循环流量等,确定了具有较高气含率、循环液速及循环流量的环流反应器结构。随后在环流反应器的上部布置筛网,改变气泡进入下降区的流动形态,考察筛网对于环流反应器流体力学以及传质性能的影响。结果表明:上升区与下降区面积比接近为1的反应器流动性能最好;在内套筒上部布置筛网会改变气泡由上升区进入到下降区的流动形态,流动形态分为3种,无气泡进入下降区、仅有小气泡进入下降区以及全部小气泡以及部分大气泡进入下降区。筛网孔径会影响环流反应器中的气含率、循环液速、循环流量以及传质系数,可以通过优化筛网孔径而提高流动与传质性能。The hydrodynamic parameters of internal airlift loop reactor(IALR)with different area ratios of riser and downcomer,such as gas holdup,liquid circulation velocity and liquid circulation flow rate,were experimentally investigated.The IALR with higher gas holdup,liquid circulation velocity and liquid circulation flow rate was determined.In order to study the effects of the screen on hydrodynamic and mass transfer characteristics,a screen was fixed on the riser of the IALR to change the flow pattern of the bubbles into the downcomer.The results show that the reactor which area ratio of riser and downcomer is nearly 1 presents the best flow performance.The flow pattern of the bubble from the riser to downcomer is changed by fixing the screen on the upper part of the inner sleeve,which is fallen into three categories,i.e.no bubbles enter the downcomer,only small bubbles enter the downcomer,and all small bubbles and some large bubbles enter the downcomer.The screen pore size has an obvious effect on the gas holdup,liquid circulation velocity,liquid circulation flow rate and mass transfer coefficient of the IALR.The hydrodynamic and mass transfer performance of the IALR can be improved by adding the screen with appropriate pore size.

关 键 词：内循环气升式环流反应器 上升区与下降区面积比 流体力学性能 传质性能 

分 类 号：TQ[化学工程]