化工进展 ›› 2022, Vol. 41 ›› Issue (8): 4025-4034.DOI: 10.16085/j.issn.1000-6613.2021-2031

• 化工过程与装备 • 上一篇    下一篇

局部磨损对α型旋风分离器内流场及分离性能的影响

范军领1(), 何昊1, 张攀1, 陈光辉2,3()   

  1. 1.青岛科技大学机电工程学院,山东 青岛 266061
    2.青岛科技大学化工学院,山东 青岛 266042
    3.山东省多相流体反应与分离工程重点实验室,山东 青岛 266042
  • 收稿日期:2021-09-27 修回日期:2021-11-22 出版日期:2022-08-25 发布日期:2022-08-22
  • 通讯作者: 陈光辉
  • 作者简介:范军领(1973—),女,副教授,研究方向为相分离技术与设备。E-mail:keda2973@163.com

Effect of local erosion on flow field and separation performance of α-type cyclone separator

FAN Junling1(), HE Hao1, ZHANG Pan1, CHEN Guanghui2,3()   

  1. 1.College of Electromechanical Engineering, Qingdao University of Science & Technology, Qingdao 266061, Shandong, China
    2.College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, Shandong, China
    3.Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, Qingdao 266042, Shandong, China
  • Received:2021-09-27 Revised:2021-11-22 Online:2022-08-25 Published:2022-08-22
  • Contact: CHEN Guanghui

摘要:

以α型旋风分离器为研究对象,基于欧拉-拉格朗日方法,采用雷诺应力模型(RSM)、颗粒离散相模型(DPM)、E/CRC磨损方程对分离器内流场与磨损特性进行数值模拟。通过分析速度矢量、切向速度、颗粒运动轨迹等参数的分布规律,研究了局部磨损对设备内流场及分离性能的影响。结果表明,α型旋风分离器入口正对壁面磨损最为严重,最大磨损率约为1.4×10-5kg/(m2·s)。磨损引起壁面几何结构的改变,导致气流方向发生偏转,不利于主流的稳定与固体颗粒的分离。随局部磨损的加剧,排气管下口短路流急剧增大,从而导致排气管下口以下区域流体流量减少,外涡切向速度降低;细颗粒的逃逸现象更加明显,粗颗粒运动轨迹趋于重合,更易形成高浓度灰环加剧壁面磨损。与未磨损时相比,局部磨损厚度50mm时,3μm粒径颗粒的分离效率由74.38%降低至54.97%,分割粒径d50由0.73μm增大至2.36μm;设备压降降低了约15.41%。

关键词: α型旋风分离器, 两相流, 磨损, 数值模拟

Abstract:

Flow field and erosion characteristics of α-type cyclone separator were numerically simulated by Reynolds stress model (RSM), particle discrete phase model (DPM) and E/CRC erosion equation based on Eulerian-Lagrangian approach. Effect of local erosion on flow field and separation performance of the equipment was studied by analyzing the distribution rule of velocity vector, tangential velocity and particle trajectory. The results showed that the erosion in the wall opposite to the α-type cyclone separator inlet was the most serious, and the maximum erosion rate was about 1.4×10-5kg/(m2·s). The change of wall geometry caused by erosion led to deflection of airflow direction, which was not conducive to the stability of the main stream and the separation of solid particles. With the intensification of local erosion, the short-circuit flow at the inlet of the vortex finder increased sharply, resulting in a decrease in fluid flow in the area below the inlet of the vortex finder and a decrease in the tangential velocity of the outer vortex. The escape phenomenon of fine particles was more obvious, and the movement trajectory of coarse particles tended to coincide, and it was easier to form a high-concentration ash ring to aggravate the erosion of the wall. Compared with the condition without erosion, when the local erosion thickness was 50mm, the particle separation efficiency of 3μm particles decreased from 74.38% to 54.97%, the cut off diameter increased from 0.73μm to 2.36μm, and the pressure drop of the equipment decreased by about 15.41%. The research results provide a theoretical guidance for industrial application of cyclone separators.

Key words: α-type cyclone separator, two-phase flow, attrition, numerical simulation

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