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级间隙高度和表观气速对多级环流反应器混合和传质的影响

陶金亮1 黄建刚1,2 肖航2 杨超2,3 黄青山2,3

(1.河北工业大学化工学院, 天津 300130)
(2.中国科学院青岛生物能源与过程研究所, 山东青岛 266101)
(3.中国科学院过程工程研究所中国科学院绿色过程与工程重点实验室, 北京 100190)

【摘要】针对应用广泛的简单多级环流反应器, 研究了级间隙高度和表观气速对其混合和传质的影响规律。发现简单多级环流反应器的各级存在着非正常流动、过渡及正常流动三个典型流动状态, 且流动状态的转变存在着受级间隙高度影响的两个临界表观气速, 并提出了相应的预测模型。研究结果表明:级间隙高度越大, 多级环流反应器内形成正常流型所需的表观气速越大;各级上升管和降液管的气含率会增高, 且相同条件下第三级气含率最大, 第二级次之, 第一级气含率最小;各级的循环液速会增大, 且第一级循环液速最大, 第二级次之, 第三级最小;混合时间会缩短, 而传质系数会增大。本研究可为工业多级环流反应器的科学设计、放大和操作提供重要指导。

【关键词】 多级环流反应器;级间隙高度;气含率;循环液速;传质;两相流;

【DOI】

【基金资助】 国家重点研发计划项目 (2016YFB0301701) ; 国家自然科学基金项目 (21376254, 91434114) ; 中国科学院科研装备研制项目 (YZ201641) ; 中国科学院关键技术人才项目 (Y8110519DM) ;

Influences of interstage height and superficial gas velocity in multistage internal airlift loop reactor on performance of mixing and mass transfer

TAO Jinliang1 HUANG Jiangang1,2 XIAO Hang2 YANG Chao2,3 HUANG Qingshan2,3

(1.School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, China 300130)
(2.Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong, China 266101)
(3.Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China 100190)

【Abstract】A simple multistage internal airlift loop reactor (MIALR), which has been widely employed in the chemical industry, was designed and investigated. The influences of interstage height and superficial gas velocity in the MIALR on the performance of the mixing and mass transfer were inspected. Three typical regimes, i.e., abnormal, transitional and regular regimes, in the MIALR were observed and proposed in this work for the first time. There were two critical superficial gas velocities impacted by the interstage height in the MIALR for the flow regime transition, and two mathematical models were proposed here for the prediction of flow regimes. The results showed that a higher superficial gas velocity was desired for reaching a regular regime when the interstage height of the MIALR increased. In addition, the respective gas holdups in the riser and the downcomer would be promoted if there was an increment of the interstage height in the MIALR. The gas holdups in the riser and the downcomer at the third stage were the highest at the same conditions, and those at the first stage were the lowest among the three stages in the reactor. Moreover, the higher the interstage height was, the higher the circulating liquid velocity in the downcomer was. The highest circulating velocity in the downcomer was measured at the first stage, and the lowest value was obtained at the third stage. Finally, a reduction of mixing time was gained when the interstage height increased, while an increase of volumetric mass transfer coefficient was obtained at the same conditions. Therefore, a guideline for the scientific design, scaling up and operating of this kind of industrial MIALRs was provided.

【Keywords】 multistage internal airlift loop reactor; interstage height; gas holdup; circulating liquid velocity; mass transfer; two-phase flow;

【DOI】

【Funds】 National Key Research and Development Program of China (2016YFB0301701) ; National Natural Science Foundation of China (21376254, 91434114) ; Instrument Developing Project of the Chinese Academy of Sciences (YZ201641) ; CAS Key Technology Talent Program (Y8110519DM) ;

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 07, Pages 2878-2889+3302

July 2018

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Article Outline

Abstract

  • Introduction
  • 1 Experimental apparatus and measurement methods
  • 2 Experimental results and discussion
  • 3 Conclusions
  • Symbol description
  • References