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过程工程学报 ›› 2023, Vol. 23 ›› Issue (10): 1390-1400.DOI: 10.12034/j.issn.1009-606X.222472

• 研究论文 • 上一篇    下一篇

狭缝孔锥形分布板对流态化反应器内部流动特性的影响

王天成1， 陈功2*， 王德喜1， 邵立新1   

  1. 1. 沈阳工业大学机械工程学院，辽宁 沈阳 110870 2. 沈阳工业大学化工装备学院，辽宁 辽阳 111000
  • 收稿日期:2022-12-28 修回日期:2023-03-13 出版日期:2023-10-28 发布日期:2023-10-30
  • 通讯作者: 陈功 chengong072@163.com

Effect of conical distribution plate with slit hole on flow characteristics in fluidized reactor

Tiancheng WANG1,  Gong CHEN2*,  Dexi WANG1,  Lixin SHAO1   

  1. 1. School of Mechanical Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China 2. School of Chemical Equipment, Shenyang University of Technology, Liaoyang, Liaoning 111000, China
  • Received:2022-12-28 Revised:2023-03-13 Online:2023-10-28 Published:2023-10-30

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摘要： 针对目前污水处理流态化反应器存在液相返混、液固混合不均的问题，设计了一种开有狭缝孔的锥形分布板，该分布板上单孔的开孔面积由反应器中心向反应器外侧逐渐增加，并采用欧拉-欧拉多相流模型、RNG k-ε湍流模型对狭缝孔锥形分布板进行数值仿真计算。结果表明，狭缝孔锥形分布板能够使反应器内部形成多个环核流流动，强化液固两相之间的混合。此外，狭缝孔锥形分布板能够使反应器内部的颗粒均布，避免颗粒在反应器壁面附近聚集，且颗粒能够获得较高的循环速度。综合评估颗粒体积分数、流速和床层密度标准差等参数，狭缝孔锥形分布板的狭缝孔的最佳开孔方式为垂直于中心轴线方向，最佳锥角为120°。

关键词: 分布板, 数值模拟, 流态化反应器, 污水处理

Abstract: Water pollution has gradually become one of the prominent problems restricting the harmonious development of urban ecosystem. At present, the development of efficient wastewater treatment technology has important practical significance to alleviate this problem. Wastewater treatment reactor is the core equipment of wastewater treatment, and the internal flow characteristics affected by its structure have an important impact on water treatment efficiency. Fluidization reactor has become a common sewage treatment equipment because of its high heat and mass transfer rate. In view of the liquid phase back mixing and uneven liquid-solid mixing still exist in fluidized reactor for wastewater treatment. Based on the mobile biofilm wastewater treatment technology and the concept of maximizing the space utilization of integrated wastewater treatment equipment, a rectangular fluidized reactor with slit hole conical distribution plate was designed. The orifice area of the distribution plate gradually increased from the center of the reactor to the outside, and the Euler-Euler multiphase flow model and RNG k-ε turbulence model were used for numerical simulation of the fluidized reactor with a conical distribution plate with slit holes. The effect of the distribution plate structure on the distribution of particles in the reactor was studied by the arrangement of the holes and the cone angle of the slit hole conical distribution plate. The results showed that the conical distribution plate with slit holes can solve the problems of liquid-phase backmixing and uneven liquid-solid mixing, form multiple ring core flows in the reactor, improve the uniformity of particle distribution, and strengthen the liquid-solid mixing. Based on the comprehensive evaluation of particle volume fraction, flow rate, and bed density standard difference, the optimal hole distribution mode of the slit conical distribution plate was determined to be perpendicular to the central axis, and the optimal fluidization effect of the reactor appeared under the cone angle of 120°.

Key words: Distribution plate, Numerical simulation, Fluidized reactor, Wastewater treatment