PABR的RTD实验CFD模拟研究

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

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。

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.