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›› 2015, Vol. 15 ›› Issue (2): 198-204.

• 流动与传递 • 上一篇    下一篇

气液两相逆流-错流撞击洗涤器内两相流动与传质特性

李光晓 王钊 范怡平 卢春喜   

  1. 中国石油大学(北京)重质油国家重点实验室 石油大学（北京）重质加工国家重点实验室 石油大学（北京）重质加工国家重点实验室
  • 收稿日期:2014-12-12 修回日期:2015-02-11 出版日期:2015-05-05 发布日期:2015-05-05
  • 通讯作者: 李光晓

Flow and Mass Transfer Characteristics in a Counter-Current Crossflow Gas-Liquid Impinging Scrubber

LI Guang-xiao WANG Zhao FAN Yi-ping LU Chun-xi   

  1. State Key Laboratory of Heavy Oil, China University of Petroleum State Key Laboratory of Heavy Oil, China University of Petroleum State Key Laboratory of Heavy Oil, China University of Petroleum State Key Laboratory of Heavy Oil, China University of Petroleum (Beijing)
  • Received:2014-12-12 Revised:2015-02-11 Online:2015-05-05 Published:2015-05-05
  • Contact: LI Guang-xiao

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摘要： 针对一种能实现气液两相逆流-错流撞击的洗涤喷嘴，采用溶氧法、摄像法和电导探针法等考察了操作参数对洗涤器内两相流型、传质性能、局部气含率的影响，并分析了洗涤器内流型、气含率与传质特性的关系. 结果表明，由于气液两相沿洗涤器径向分布不均，文献中通过直观观察描述流型的方法明显欠准确. 在直观观察的基础上，依据局部气含率分布将两相流型分为液柱型、环流型和泡沫型三类，其中泡沫型分为环状泡沫型和碗状泡沫型两种. 为了定量分析不同流型的传质效果，定义了有效传质区(气液接触、传质过程中形成的两相流中气含率75%≤eg≤85%的区域)，得出了有效传质体积的计算表达式. 气液逆流撞击的洗涤器内有效传质体积越大，传质效果越好.

关键词: 气液传质, 喷嘴, 气含率, 洗涤器

Abstract: The effects of operating parameters on the flow pattern, mass transfer performance and local gas hold-up distribution are studied via the imaging method, dissolved oxygen method and double-sensor conductivity probe to reveal their relationship in a novel washing nozzle which can implement gas-liquid counter-current crossflow impingement. The results show that the flow pattern characterized only by direct observation method in some previous research can not describe it accurately because of the non-uniform gas-liquid racial distributions. Based on the imaging and local gas hold-up measurement, the flow pattern can be divided into five types: liquid column flow, annular flow and bubble flows (including the annular bubble flow and bowl-shaped bubble flow). Moreover, a new parameter Veff (effective mass transfer zone) in which the local gas hold-up (eg) ranges from 75% to 85% is proposed. It can be used to analyze the mass transfer effect of different flow patterns quantitatively. For any counter-current crossflow gas-liquid impinging scrubber, the mass transfer efficiency increases with the proposed parameter Veff.

Key words: gas-liquid mass transfer, gas holdup, scrubber, crossflow

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