CIESC Journal ›› 2015, Vol. 66 ›› Issue (4): 1344-1352.DOI: 10.11949/j.issn.0438-1157.20141731

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Analysis of re-entrainment in process of gas-liquid filtration

CHANG Cheng1, JI Zhongli1, HUANG Jinbin2, ZHAN Shuang2, LI Lanjie1   

  1. 1. School of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China;
    2. School of Chemical Engineering, China University of Petroleum, Beijing 102249, China
  • Received:2014-11-21 Revised:2015-01-04 Online:2015-04-05 Published:2015-04-05
  • Supported by:

    supported by the National Natural Science Foundation of China (51376196) and the National Science and Technology Major Project (2011ZX05039-001-003).

气液过滤过程中液滴二次夹带现象分析

常程1, 姬忠礼1, 黄金斌2, 詹爽2, 李兰洁1   

  1. 1. 中国石油大学机械与储运工程学院, 北京 102249;
    2. 中国石油大学化学工程学院, 北京 102249
  • 通讯作者: 姬忠礼
  • 作者简介:常程(1988-),男,博士研究生。
  • 基金资助:

    国家自然科学基金项目(51376196);国家科技重大专项(2011ZX05039-001-003)。

Abstract:

In long-distance transmission of natural gas, safe operation of compressor units is seriously affected by droplets entrained in natural gas. The characteristics of re-entrainment in gas-liquid filtration process of filter cartridges were investigated using liquid aerosol of di-ethyl-hexyl-sebacate (DEHS). The effects of filter material wettability and filtration velocity on re-entrainment were also evaluated experimentally. Re-entrainment could be observed in the process of filtration as filter cartridges only composed of coalescing layers. More droplets were entrained into the downstream due to re-entrainment and some large particles could be detected at the downstream. Cumulative efficiency decreased at the large particle size at steady state. Re-entrainment was affected by filter material wettability. Compared with non-wettable filter material, re-entrainment was more obvious on the surface of wettable filter material. To improve filtration efficiency, non-wettable filter material were more suitable for producing industrial filter cartridges at the same filtration velocity. As filtration speed increased from 0.1 m·s-1 to 0.3 m·s-1, higher filtration velocity led to less re-entrainment, and filtration performance of wettable filter cartridges were improved more significantly than that of non-wettable filter cartridges. Re-entrainment could be eliminated by adding drainage layer to filter cartridges.

Key words: re-entrainment, aerosol, filtration, wettability, filtration velocity, natural gas

摘要:

在天然气长距离输送过程中,天然气夹带的液滴严重影响压缩机组的安全可靠运行。利用所建立的滤芯过滤性能检测装置,以癸二酸二辛酯为实验介质,分析了天然气净化用滤芯气液过滤过程中液滴二次夹带现象的特征,比较了滤材润湿性和过滤速度等参数的影响。结果表明:当滤芯仅由聚结层组成时,滤芯过滤过程中存在液滴二次夹带现象,二次夹带将导致下游气体中液滴数量增多,且有较大液滴出现,稳态阶段滤芯累积效率在大粒径处下降;液滴在滤材表面的润湿性对二次夹带现象具有重要影响,可润湿型滤材表面更易出现液滴二次夹带现象,在相同过滤速度下,若需提高过滤效率,宜选用不可润湿型滤材制作工业滤芯;在0.1~0.3 m·s-1过滤速度范围内,提高过滤速度可减少液滴二次夹带现象的发生,与不可润湿型滤芯相比,可润湿型滤芯过滤效果的改善更为明显;滤芯增加排液层可有效消除液滴二次夹带现象。

关键词: 二次夹带, 气溶胶, 过滤, 润湿性, 过滤速度, 天然气

CLC Number: