关键词: 填充床, 内构件, 计算流体力学, 流体力学, 停留时间分布

Abstract: A mathematical model describing the gas flow in a packed bed with novel internals was established, which considered the combined geometry of a packed bed of particles and the gas passages with baffles. Computational fluid dynamics (CFD) simulation was carried out to study the flow pattern and the residence time distribution (RTD) of gas phase under different operating conditions and reactor geometries. The experimental data of the pressure drop validated the CFD simulation at the reactor scale. The detailed flow field inside the reactor was disclosed with the simulation, which showed the zig-zag flow behavior of the gas phase through the packed bed and the gas passages. The gas did not by-pass the system because the reactor remained to be the configuration with multiple compartments connected in series. The design of the internal imposed strong influence on the gas flow field and the corresponding RTD, which allowed a large room for optimizing the packed bed with internals.

Key words: packed bed, internals, computational fluid dynamics, hydrodynamics, residence time distribution