PABR 的 RTD 实验 CFD 模拟研究

为解决传统的流动和传质特性研究只能通过实验方法获得一些经验性关系的局限性问题, 采用计算流体 动力学(CFD: Computational Fluid Dynamic)技术对微生态周期切换式厌氧系统(PABR: Periodic Anaerobic Baffled Reactor)进行了停留时间分布(RTD: Residence Time Distribution)实验的 CFD 模拟, 以期为 PABR 构型改进、 工况模拟、 风险预测与评估等工作的开展提供节省人力物力的实施方案。 利用 COMSOL 平台对 PABR 内水体 的 SOLID WORKS 三维建模进行网格划分, 进而使用单向流层流模块、 稀物质传递模块及瞬态求解器, 根据 PABR 试验装置实物 RTD 的边界条件进行模拟。 应用 Matlab 对其实物与 CFD 模拟的标准化曲线分别进行归一 化积分求解, 判定其相似程度在可接受范围。 最后利用 COMSOL 后处理技术可视化示踪剂在 PABR 内的流动 和扩散过程, 从而实现人机交互。

Computational Fluid Dynamic Simulations of Periodic Anaerobic Baffled Reactor on Residence Time Distribution

In order to break through the limitation of traditional study on behavior of flow and mass transfer by material objects, CFD ( Computational Fluid Dynamic ) simulations of PABR ( Periodic Anaerobic Baffled Reactor) on RTD( Residence Time Distribution) was carried out in this paper, supporting implementing schemes to economize manpower and material resources in configuration improvement, simulation of operating mode, risk monitoring and forecast. A three-dimensions modeling of the tap water body in the PABR modelled by SOLID WORKS was meshed by COMSOL. Then, RTD simulating test was performed by unidirectional flow layer module, thin mass transfer module and transient solver, based on the boundary conditions of lab-scale experimental material object. Normalized integration of the normalized curves of both the material object and the simulating was fitted and calculated by Matlab, and the similarity of the two curves was acceptable. Finally, the behavior of tracer in the flow and diffusion procedure was visualized by post-processing with COMSOL, and human-computer interaction was achieved.