西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (2): 164-175.DOI: 10.11885/j.issn.1674-5086.2021.08.18.01

• 石油机械与油田化学 • 上一篇    下一篇

固液混合物振动筛分机理研究

方潘1,2,3, 陆小刚1,2, 石双全1,2, 彭欢1,2, 侯勇俊1,2   

  1. 1. 西南石油大学机电工程学院, 四川 成都 610500;
    2. 石油天然气装备教育部重点实验室, 四川 成都 610500;
    3. 油气藏地质及开发工程全国重点实验室·西南石油大学, 四川 成都 610500;
    4. 石油天然气装备技术四川省科技资源共享服务平台, 四川 成都 610500
  • 收稿日期:2021-08-18 发布日期:2024-05-11
  • 通讯作者: 方潘,E-mail:ckfangpan@126.com
  • 作者简介:方潘,1986年生,男,汉族,四川南充人,副教授,博士,主要从事流体机械、振动筛分技术、钻井工程等方面的研究。E-mail:ckfangpan@126.com;陆小刚,1996年生,男,汉族,四川绵阳人,硕士研究生,主要从事振动筛分技术、计算流体力学等方面的研究。E-mail:1562942199@qq.com;石双全,1997年生,男,汉族,四川巴中人,硕士研究生,主要从事振动工程、振动控制等方面的研究。E-mail:897050244@.qq.com;彭欢,1994年生,男,汉族,四川德阳人,博士研究生,主要从事振动工程、振动控制等方面的研究。E-mail:917107468@qq.com;侯勇俊,1967年生,男,汉族,四川盐亭人,教授,博士,主要从事机械振动利用和控制、石油矿场机械与井下工具、流体机械、机械动力学等方面的研究工作。E-mail:hyj2643446@126.com
  • 基金资助:
    国家自然科学基金(51705437);四川省重点研发计划(2020YFG0181)

Screening Mechanism of the Solid-liquid Mixture Vibration Screen

FANG Pan1,2,3, LU Xiaogang1,2, SHI Shuangquan1,2, PENG Huan1,2, HOU Yongjun1,2   

  1. 1. School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. MOE Key Laboratory of Oil & National Gas Equipment, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    4. Sichuan Science and Technology Resource Sharing Service Platform of Oil and Gas Equipment Technology, Chengdu, Sichuan 610500, China
  • Received:2021-08-18 Published:2024-05-11

摘要: 振动筛分技术是固液混合物分离的一种手段,被广泛应用于钻井液固相控制、河道淤泥处理和煤矿脱水等领域。现有研究对固液混合物的振动筛分机理缺乏认识,限制了振动设备筛分效率的提升空间。针对这一问题,采用计算流体力学与离散单元耦合法(CFD–DEM)研究了固液混合物振动筛分机理。首先,利用Hertz-Mindlin JKR Cohesion接触模型引入湿颗粒之间的碰撞行为;其次,应用多孔介质描述了筛网的细孔特征;然后,运用动网格模拟了筛网的直线振动轨迹;最后,分析了固相颗粒物料的动力学特性和液相流动特性,并对比研究了振动系统的振幅和振动频率对固液混合物筛分效率的影响。研究结果表明,增加振幅和振动频率可提高固液混合物筛分效率,但当振幅大于3.0 mm和频率大于22.3 Hz时,振动筛对固液混合物的筛分效率影响的敏感性减弱;振幅小于或等于3.0 mm和频率小于或等于22.3 Hz时,固液混合物振动筛分效率对振幅的变化最敏感,振动频率次之;固液混合物的透筛区域集中在筛网长度比小于20$%$的区域。

关键词: 计算流体力学, 多孔介质, 筛分机理, 数值模拟, 颗粒物料, 振动筛分

Abstract: Vibration screening technology is a means for the separation of solid-liquid mixture, which is widely used in solid phase control of drilling fluid, river mud treatment and dehydration of coal mine. However, the existing research lacks sufficient comprehension for the vibration screening mechanism of solid-liquid mixture, which limits the improvement of screening efficiency of vibration equipment. In order to solve this problem, the CFD-DEM (Computational Fluid Dynamics-Discrete Element Method) coupling method is used to study the screening mechanism of solid-liquid mixture vibration screen. Firstly, Hertz-Mindlin with JKR Cohesion model is used to simulate the collision characteristics between wet particles. Secondly, porous media is used to describe the hole characteristics of screen. Then the linear vibration trajectory of the screen is simulated by using dynamic mesh. Finally, dynamic characteristics of granular materials and flow characteristics of liquid are analyzed, and the effect of vibration frequency and amplitude on the screening efficiency of solid-liquid mixture are compared. The results show that screening efficiency of solid-liquid mixture can be improved by increasing the amplitude and frequency appropriately, but when $A$>3.0 mm and $f$>22.3 Hz, the effect of vibration screen on screening efficiency of solid-liquid mixture is weakened; when $A$≤3.0 mm and $f$≤22.3 Hz, the screening efficiency of solid-liquid mixture is more sensitive to the change of amplitude, and that of the vibration frequency next to it. The passing area of solid-liquid mixture is mainly concentrated in the area where the length of the screen $L$<20$\%$.

Key words: omputational fluid dynamics, porous media, screening mechanism, numerical simulation, granular material, vibration screen

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