摘要
根据颗粒流动力学理论,对沥青基球状活性炭气固流化床的流体力学行为进行数值模拟和实验验证。使用流体动力学软件ANSYS Fluent研究二维气固流化床的流动特性。采用多流体欧拉模型,通过对比冷模试验,分析5种曳力模型、数值参数、进气速度、床层压降和膨胀高度的模拟结果。研究表明:在Syamlal-O’Brien模型下,气固流化床的数值计算参数采用时间步长0.000 1 s、收敛准则10^(-3)的二阶离散格式模拟效果最佳。床层运行的理想速度在0.35~0.45 m·s^(-1)之间,此时床内颗粒呈明显流化现象。验证结果表明床层压降和膨胀高度的实验与模拟结果一致性好。
The hydrodynamic behavior of a gas-solid fluidization bed of asphalt-based spherical activated carbon is numerically simulated and experimentally verified in conjunction with particle flow dynamics theory.The hydrodynamic properties of two-dimensional gas-solid fluidized beds were investigated using the computational fluid dynamics software ANSYS Fluent.A multi-fluid Eulerian model is used to analyze the simulation results of five traction models,numerical parameters,inlet velocity,bed pressure drop,and expansion height by comparing cold-mode tests.It is shown that the numerical calculation parameters of the gas-solid fluidized beds under the Syamlal-O’Brien model are best simulated using a second-order discrete format with a time step of 0.0001 s and a convergence criterion of 10^(-3).The ideal speed for bed operation is between 0.35 and 0.45 m·s^(-1) when the particles in the bed are fluidized.The experimental and simulated results for bed pressure drop and expansion height are verified to be in good agreement.
作者
葛倩男
杨榛
GE Qiannan;YANG Zhen(College of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《化学工业与工程》
北大核心
2025年第1期157-164,共8页
Chemical Industry and Engineering
关键词
气固流化床
球状活性炭
数值模拟
曳力模型
流动特性
gas-solid fluidized bed
spherical activated carbon
numerical simulation
drag force model
flow characteristics
