脉动进料气液旋流分离器分离性能分析

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摘要为提高钻井液振动筛的气、固、液分离能力,一种以振动筛形成的脉动真空与压缩空气注入相结合的固液分离钻井方法被提出,在此基础上出现了一种采用脉动进料边界的旋流器。为分析旋流器的气液分离性能,需要探究其脉动进料条件下的最佳气液分离效率及其影响参数。为此,采用Fluent对稳定、脉动进料状态下不同结构参数的旋流分离器进行流动模拟,通过UDF函数设置脉动进料边界,并分析效率曲线得到脉动进料状态下分离器的最优参数。结果表明,脉动进料状态下的流场可以较好地实现稳定;采用频率为0.4 Hz的正弦脉冲进料气液分离效率最高,可达85.5%;在脉动进料状态下,其脉动不连续性会导致流场湍动能变大,径向压力降梯度降低,切向速度峰值降低。

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关键词：气液旋流分离器脉动进料流动模拟 UDF函数参数优选

Abstract： In order to better improve the gas-solid-liquid separation ability of drilling fluid shaker, a solid-liquid separation drilling method is proposed, which combines pulsating vacuum formed by a vibrating screen with compressed air injection simultaneously. On this basis, a kind of hydrocyclone using pulsating feed boundary for gas-liquid separation was developed. To analyze the gas-liquid separation performance of hydrocyclone, it is necessary to explore the optimal gas-liquid separation efficiency and its influencing parameters under the condition of pulsating feed. In order to solve this problem, the finite element software Fluent is used to simulate the flow of the cyclone separator with different structural parameters under the states of stable or pulsating feed. The boundary of pulsating feed was set by User-Define-Functions (UDF), and analyzing the efficiency curve. The optimal parameters of the separator under the pulsating feed state are obtained. The results show that the flow field in the pulsating feed state can be better stabilized. The highest gas-liquid separation efficiency of the cyclone separator can be achieved by sinusoidal pulse with a frequency of 0.4 Hz, the efficiency can reach 85.5%. Due to the existence of the pulsating feed, the separation efficiency of the separator is lower than that of the stable feed. Compared with the stable feed state, under the condition of pulsating feed, the pulsating discontinuity will lead to the increase of turbulent kinetic energy, the decrease of radial pressure gradient and the decrease of the peak value of tangential velocity. The above conclusions can provide the theoretical guidance for the design and engineering application of gas-liquid cyclone separator with pulsating feed.

Keywords： gas-liquid cyclone separator pulsating feed flow simulation UDF parameter optimization

Received 2021-04-22;

Fund:四川省科技计划项目(2019YFG0317)。

Corresponding Authors: 侯勇俊,教授,E-mail:hyj2643446@126.com。 Email: hyj2643446@126.com

About author: 杨容(1994-),女,硕士研究生,现从事钻井液振动筛方面的研究。

引用本文:

杨容, 侯勇俊, 卢广荣.脉动进料气液旋流分离器分离性能分析[J]. 化学工业与工程, 2022,39(5): 109-118

YANG Rong, HOU Yongjun, LU Guangrong.Analysis of separation performance of pulsating feed on gas-liquid hydrocyclone separator[J]. Chemcial Industry and Engineering, 2022,39(5): 109-118

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