脱液型管式气液分离器旋流分离段内液膜流动和分离特性

doi:10.16085/j.issn.1000-6613.2024-0437

化工进展 ›› 2024, Vol. 43 ›› Issue (8): 4297-4306.DOI: 10.16085/j.issn.1000-6613.2024-0437

• 化工过程与装备 • 上一篇

脱液型管式气液分离器旋流分离段内液膜流动和分离特性

宋家恺¹(), 孔令真¹^,²(), 陈家庆¹^,², 孙欢¹, 李奇³, 李长河³, 王思诚¹, 孔标¹

^1.北京石油化工学院环境工程系，北京 102617
^2.深水油气管线关键技术与装备北京市重点实验室，北京 102617
^3.中国石化石油勘探开发研究院，北京 102617

收稿日期:2023-03-15 修回日期:2024-05-08 出版日期:2024-08-15 发布日期:2024-09-02
通讯作者: 孔令真
作者简介:宋家恺（1996—），男，硕士研究生，研究方向为环保多相流高效技术分离与设备。E-mail：songjiakai96@163.com。
基金资助:
中国石油化工股份有限公司科研项目(322040);北京市教委科技计划一般项目(KM202210017009)

Liquid film flow and separation characteristics in the swirl separation section of a tubular deliquidiser

SONG Jiakai¹(), KONG Lingzhen¹^,²(), CHEN Jiaqing¹^,², SUN Huan¹, LI Qi³, LI Changhe³, WANG Sicheng¹, KONG Biao¹

^1.Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
^2.Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing 102617, China
^3.Sinopec Petroleum Exploration and Production Research Institute, Beijing 102617, China

Received:2023-03-15 Revised:2024-05-08 Online:2024-08-15 Published:2024-09-02
Contact: KONG Lingzhen

摘要/Abstract

摘要：

脱液型管式气液分离器旋流分离段内液膜流动特性是影响分离性能的关键因素，掌握液膜流动与分离效率之间的关系对结构改进和性能提升至关重要。本文改变液气比、入口气速、分流比和旋流叶片出口角等因素开展室内实验测试，获得不同工况下液膜流动的高速摄影图像和分离效率，基于Matlab编程建立液膜表面波速度和角度的图像分析方法，确定液膜流动特性与分离效率之间的关系。结果表明，液气比在0.12~0.3L/m³范围内，液气比和分流比对分离效率和液膜表面波速度的影响不明显；入口气速对分离效率和液膜表面波速度的影响最为显著，随着入口气速逐渐增加，分离效率先增大后减小，在入口气速18.82m/s时出现拐点；旋流叶片出口角分别为30°、45°、60°时，分离效率由大到小依次为30°>45°>60°，液膜表面波速度由大到小依次为60°>45°>30°。总的来说，旋流分离管段内液膜表面波速度0.98m/s为临界值，液膜表面波速度大于该值时，环缝排液口处液膜更易发生破碎，部分破碎的大液滴在重力和气流作用下进入气相出口，导致气液分离效率显著下降；液膜表面波速度小于0.98m/s时，分离效率基本保持在98%以上。

关键词: 气液分离, 液膜流动特性, 液膜表面波速度, 分离效率

Abstract:

The flow characteristics of the liquid film in the cyclone section of the tubular deliquidiser are the key factors affecting the separation performance. It is very important to understand the relationship between liquid film flow and separation efficiency for structure improvement and performance improvement. In this paper, the factors such as liquid-gas ratio, inlet gas velocity, split flow ratio and outlet angle of swirl blade and so on were changed to obtain the high-speed photographic images and separation efficiency of liquid film flow under different operating conditions by carrying out laboratory experiments. The image analysis method of the velocity and angle of the surface wave of the liquid film was established based on Matlab programming to determine the relationship between the flow characteristics of the liquid film and the separation efficiency. The results showed that when the liquid-gas ratio was in the range of 0.12—0.3L/m³, the effects of liquid-gas ratio and split flow ratio on the separation efficiency and the surface wave velocity of liquid film were not obvious. The inlet velocity had the most significant effect on the separation efficiency and liquid film surface wave velocity. With the inlet velocity increasing gradually, the separation efficiency increased first and then decreased, and the inflection point occurred at the inlet velocity of 18.82m/s. The separation efficiency was 30°>45°>60° from large to small, and the surface wave velocity of liquid film was 60°>45°>30° from large to small, when the exit angle of swirl blade was 30°, 45° and 60°, respectively. In general, the critical value of liquid film surface wave velocity in the swirl separation pipe segment was 0.98m/s, and when the liquid film surface wave velocity was greater than this value, the liquid film was more likely to break at the liquid outlet of the annular gap, and some of the broken large droplets entered the gas phase outlet under the action of gravity and air flow, resulting in a significant decline in gas-liquid separation efficiency. When the surface wave velocity of liquid film was less than 0.98m/s, the separation efficiency was basically kept above 98%.

Key words: gas-liquid separation, liquid film flow characteristics, film surface wave velocity, separation efficiency

中图分类号:

TQ021.1

宋家恺, 孔令真, 陈家庆, 孙欢, 李奇, 李长河, 王思诚, 孔标. 脱液型管式气液分离器旋流分离段内液膜流动和分离特性[J]. 化工进展, 2024, 43(8): 4297-4306.

SONG Jiakai, KONG Lingzhen, CHEN Jiaqing, SUN Huan, LI Qi, LI Changhe, WANG Sicheng, KONG Biao. Liquid film flow and separation characteristics in the swirl separation section of a tubular deliquidiser[J]. Chemical Industry and Engineering Progress, 2024, 43(8): 4297-4306.

图/表 21

图1 脱液型管式气液分离器结构示意图

图2 脱液型管式气液分离器性能测试实验平台的工艺流程示意图

图3 高速摄像拍摄液膜的点位示意图

图4 叶片出口角与液膜角度示意图

图5 液膜表面波速度分析方法框图

图6 轮廓线融合及液膜流动距离测量示意图

图7 轴向和周向距离修正标定示意图

图8 液气比对分离效率和压降的影响

图9 不同液气比下液滴粒径分布图

图10 液气比对液膜表面波速度和角度的影响

图11 不同液气比下液膜流态对比

图12 液气比为0.12L/m3和0.228L/m3环缝处液膜形态

图13 入口气速对分离效率和压降的影响曲线

图14 不同入口气速下液滴粒径分布图

图15 入口气速对液膜表面波速度和角度的影响

图16 不同入口气速下液膜流态对比

图17 入口气速为15.99m/s和24.62m/s环缝处液膜形态

图18 分流比对分离效率和压降的影响曲线

图19 分流比对液膜表面波速度和角度的影响

图20 旋流叶片角度对分离效率的影响

图21 旋流叶片角度对液膜表面波速度和角度的影响

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脱液型管式气液分离器旋流分离段内液膜流动和分离特性

Liquid film flow and separation characteristics in the swirl separation section of a tubular deliquidiser

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