Numerical simulation and structural optimization of flow field in industrial gas-solid fluidized beds based on CFD-PBM

doi:10.16085/j.issn.1000-6613.2024-0174

Abstract

Abstract:

The multi-level geometric structures within a fluidized bed influence the dynamics, thermodynamics, and chemical reactions of the internal fluids. Numerical simulation studies of the flow field inside fluidized beds contribute to understanding their complex flow characteristics, establishing a theoretical basis for optimizing the geometric structure and operating conditions of the fluidized beds, thereby enhancing their mass transfer efficiency and performance. Based on computational fluid dynamics theory, a method for the numerical simulation of the flow field within gas-solid fluidized beds was developed. The study investigated the effects of the geometry of the distributor, the diameter of the bed, and the length of the distributor's brim on the flow field within the industrial gas-solid fluidized bed. On this basis, by integrating the Quadrature Method of Moments, a CFD-PBM coupled model was constructed. Utilizing this model, a numerical simulation method for the fluidization state and agglomeration behavior of nanoparticles in the industrial gas-solid fluidized bed was developed, further validating the influence of barrel diameter on the fluidization state of nanoparticles within the fluidized bed. The study indicated that when the diameter was 260mm, the gas velocity distribution around the distributor was uniform, and the dead zone of airflow at the bottom of the distributor was minimized. When the brim length was half the size of the distributor's outlet, the gas velocity distribution within the fluidized bed was more uniform.

Key words: fluidized-bed, computational fluid dynamics-population balance model, numerical simulation, optimal design, nanoparticles

摘要：

流化床内的多级几何结构影响其内流体的动力学、热力学以及化学反应等参数，对于流化床内流场的数值模拟研究有助于理解其内复杂的流动特性，建立流化床的几何结构和操作条件优化的理论基础，从而提高流化床的传质效率和性能。以计算流体力学理论为基础建立了气固流化床内流场的数值模拟方法，研究了风帽的几何结构、筒径和帽檐长度对工业气固流化床内流场的影响规律。在此基础上，结合群体平衡方程矩方法，构建了计算流体力学-群体平衡模型（computational fluid dynamics-population balance model，CFD-PBM），利用该模型建立了工业气固流化床中纳米颗粒流化状态和团聚行为的数值模拟方法，进一步验证了筒径对流化床内纳米颗粒流化状态的影响规律。研究表明，筒径为260mm时，风帽四周气速分布均匀且风帽下端气流死区面积最小；帽檐长度为风帽出风口尺寸的1/2时，流化床内气速分布更均匀。

关键词: 流化床, 计算流体力学-群体平衡模型, 数值模拟, 优化设计, 纳米颗粒

CLC Number:

TQ051.1

MAO Ningxuan, WAN Xiaowei, JU Jie, HU Yanjie, JIANG Hao. Numerical simulation and structural optimization of flow field in industrial gas-solid fluidized beds based on CFD-PBM[J]. Chemical Industry and Engineering Progress, 2024, 43(S1): 13-20.

毛宁轩, 万小维, 鞠杰, 胡彦杰, 江浩. 工业气固流化床内流场的CFD-PBM数值模拟和结构优化[J]. 化工进展, 2024, 43(S1): 13-20.

Figures/Tables 13

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