Multiphase flow dynamics and separation efficiency enhancement in a novel cascade spiral gas-liquid separator: Numerical investigation and parametric analysis

IF 3.9 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification Pub Date : 2025-10-02 DOI:10.1016/j.cep.2025.110575

Gang Li , Zihan Lin , Xingchen Li , Mingjiang Shi , Yun Tang , Jiahao Yuan , Ruijun Liu

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Abstract

To overcome the limitations of conventional single-stage spiral gas-liquid separators exhibiting suboptimal separation efficiency, this research proposes an innovative cascade spiral gas-liquid separator (CSGS). The structure and operational mechanism of the CSGS were explained, a mathematical model of gas-liquid two-phase dynamics was established, and the force characteristics of the gas-liquid two-phase flow were investigated. Based on the velocity, pressure, and vortex characteristics of the two-phase inside the CSGS, the influences of the key parameters, such as flow rate, gas volume fraction and bubble size, on the separation efficiency were analyzed quantitatively. The study shows that flow rate reduction enhances two-phase separation efficiency, peaking at 98.97% at 2 m/s. When the gas volume fraction falls from 30% to 10%, the separation efficiency at the gas outlet decreases sharply from 97.71% to 29.73%, indicating significant impact of gas volume fraction reduction. Moreover, the increase in bubble size improves separation efficiency from 79.82% at 0.05 mm bubble size to 98.93% when exceeding 0.8 mm. This paper provides a reference for designing downhole gas-liquid separation tools and proposes a new idea for enhancing spiral separator separation effects.

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新型叶栅螺旋气液分离器多相流动力学及分离效率的提高：数值研究与参数分析

为了克服传统单级螺旋气液分离器分离效率不佳的局限性，本研究提出了一种创新的叶栅螺旋气液分离器（CSGS）。阐述了CSGS的结构和工作机理，建立了气液两相动力学数学模型，研究了气液两相流的受力特性。基于CSGS内部两相的速度、压力和涡特性，定量分析了流量、气体体积分数和气泡尺寸等关键参数对分离效率的影响。研究表明，减小流量可提高两相分离效率，在2m /s时两相分离效率达到98.97%。当气体体积分数从30%下降到10%时，气体出口分离效率从97.71%急剧下降到29.73%，表明气体体积分数降低影响显著。增大气泡尺寸可使分离效率从0.05 mm时的79.82%提高到0.8 mm时的98.93%。为井下气液分离工具的设计提供了参考，提出了提高螺旋分离器分离效果的新思路。

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来源期刊

Chemical Engineering and Processing - Process Intensification 工程技术-工程：化工

CiteScore

7.80

自引率

9.30%

发文量

408

审稿时长

49 days

期刊介绍： Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.