关键词: 计算流体动力学CFD, 气升式环流床反应器, k-ε双方程模型;, 气体分布器, 帽罩

Abstract: In order to optimize the internal structure of airlift loop bed reactor and improve the gas liquid mass transfer efficiency, the two-phase flow process was simulated by using the Euler-Euler two-fluid model of CFD (computational fluid dynamics) and the standard k-ε model. The circulating fluid velocity was simulated at different axial height of the reactor riser, and the experimental values and simulation results were compared to verify the correctness of the physical simulation. According to the selected model, gas distributors were set at different coaxial positions of the reactor riser, and caps with different structures were set at the top of the riser. By comparing the distribution states of liquid velocity and gas holdup under different structures, the optimal structure of the reactor was obtained: the gas distributor was set at the bottom of the riser, that is inner-4, and the top of the riser cap was the Cap-2, at this time the circulating fluidization of the airlift loop bed reactor was in the optimal state and the gas-liquid mass transfer is the best.

Key words: CFD, airlift loop bed reactor, k-ε model;, gas distributor, the cap