化工进展 ›› 2024, Vol. 43 ›› Issue (3): 1133-1144.DOI: 10.16085/j.issn.1000-6613.2023-0353

• 化工过程与装备 • 上一篇    

基于CFD-DEM算法的气力输送气固两相流特性分析

禹言芳1(), 石博文1, 孟辉波2(), 丁鹏程1, 姚云娟1   

  1. 1.沈阳化工大学机械与动力工程学院,辽宁 沈阳 110142
    2.中国石油大学(华东)新能源学院,山东 青岛 266580
  • 收稿日期:2023-03-08 修回日期:2023-05-17 出版日期:2024-03-10 发布日期:2024-04-11
  • 通讯作者: 孟辉波
  • 作者简介:禹言芳(1979—),女,博士,副教授,研究方向为化工过程强化。E-mail:taroyy@163.com
  • 基金资助:
    辽宁特聘教授计划(辽教函[2018]35号);国家自然科学基金(21476142);辽宁省教育厅高等学校基本科研项目重点项目(LJKZ0429);辽宁省自然科学基金(2022-MS-290);青岛市自然科学基金(23-2-1-236-zyyd-jch);中国石油大学(华东)人才引进研究基金(R20220113)

Characteristics analysis of gas solid two-phase flow in pneumatic conveying based on CFD-DEM algorithm

YU Yanfang1(), SHI Bowen1, MENG Huibo2(), DING Pengcheng1, YAO Yunjuan1   

  1. 1.School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
    2.College of New Energy, China University of Petroleum (East China), Qingdao 266580, Shandong, China
  • Received:2023-03-08 Revised:2023-05-17 Online:2024-03-10 Published:2024-04-11
  • Contact: MENG Huibo

摘要:

超轻粉体颗粒由于质量较小,在运输过程中易受气流扰动而飘散,物料的管道气力输送过程不稳定,易发生堵塞。为了研究超轻粉体颗粒在旋流气力输送中气固两相流流动特性,采用计算流体力学与离散单元法(CFD-DEM),对Komax型静态混合器内气固两相流动特性进行数值模拟研究。研究发现,带有Komax型元件的水平管道可以改变颗粒的流动情况,改善了水平管道内颗粒堆积和分布不均匀的现象;分别从颗粒相和流体相的流动状态分析得到元件长径比Ar=3时为最优几何结构;通过正交实验极差分析得到影响气固两相流动特性的因素顺序: 输送气速>颗粒质量流量>颗粒粒径。当元件Ar=3时,颗粒-颗粒和颗粒-管壁的碰撞次数与碰撞强度呈现负相关,结合出口颗粒流分散状态,优选输送气速为3~4m/s;主要考虑输送气速对管内压降的影响,提出了带有Komax型元件的水平管道气力运输过程中压降与输送气速和轴向位置的经验拟合式。

关键词: 静态混合器, 多相流, 稀相旋流气力输送, 颗粒流, CFD-DEM耦合法, 流动特性

Abstract:

Because of its light weight, ultra-light powder particles are easily disturbed by airflow in the process of transportation, and the pipeline pneumatic conveying process of material is unstable and prone to blockage. To study the gas-solid two-phase flow characteristics of ultra-light powder particles in cyclone pneumatic conveying, computational fluid dynamics and discrete element method (CFD-DEM) were used to simulate the gas-solid two-phase flow characteristics in Komax static mixer. It was found that the horizontal pipe with Komax elements can change the particles flow state, and improve the accumulation and uneven distribution of particles. From the analysis of the flow state of particle phase and fluid phase, it was concluded that the element aspect ratio Ar=3 was the preferred geometry structure. Through the range analysis of orthogonal experiments, the order of factors affecting gas-solid two-phase flow characteristics was obtained as follows: conveying gas velocity > particle mass flow rate > particle size. When the element aspect ratio Ar was 3, the collision frequency and strength of particle-particle and particle-wall were negatively correlated. Combining with the dispersion state of the particle flow at the outlet, the optimal conveying gas velocity was 3—4m/s. Considering the influence of conveying gas velocity on pressure drop in the pipeline, the empirical fitting formula of pressure drop, conveying gas velocity and axial position during pneumatic transportation of horizontal pipeline with Komax element was proposed.

Key words: static mixer, multiphase flow, dilute phase swirl pneumatic conveying, granular flow, CFD-DEM coupling method, flow characteristic

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