| 气液过滤过程中液滴二次夹带现象分析 |
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| 引用本文： | 常程,姬忠礼,黄金斌,詹爽,李兰洁.气液过滤过程中液滴二次夹带现象分析[J].化工学报,2015,66(4):1344-1352. |
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| 作者姓名： | 常程 姬忠礼 黄金斌 詹爽 李兰洁 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金项目(51376196);国家科技重大专项(2011ZX05039-001-003)~~ |
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| 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。
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| 关 键 词： | 二次夹带 气溶胶 过滤 润湿性 过滤速度 天然气 |
| 收稿时间： | 2014-11-21 |
| 修稿时间： | 2015-01-04 |
Analysis of re-entrainment in process of gas-liquid filtration |
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| CHANG Cheng;JI Zhongli;HUANG Jinbin;ZHAN Shuang;LI Lanjie.Analysis of re-entrainment in process of gas-liquid filtration[J].Journal of Chemical Industry and Engineering(China),2015,66(4):1344-1352. |
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| Authors: | CHANG Cheng;JI Zhongli;HUANG Jinbin;ZHAN Shuang;LI Lanjie |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | re-entrainment aerosol filtration wettability filtration velocity natural gas |
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