Unsteady State Analysis of a Polypropylene Loop Reactor Based on CFD Simulation
1. School of Chemistry and Chemical Engineering , Wuhan University of Science and Technology, Wuhan 430081, China;
2. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou 310027 China;
3. College of Chemical and Biology Engineering, Zhejiang University, Hangzhou 310027, China
Abstract The non-uniform particle flow in the polypropylene loop reactor is the main reason for the power fluctuation of the axial flow pump. In this paper, the non-uniform flow characteristics of liquid-solid two-phase flow in a loop reactor were studied based on the unsteady computational fluid dynamics(CFD) simulation, and the influence of particle size on the non-uniform particle flow was further compared. The simulation results showed that the larger the particle size, the larger fluctuating ranges and frequencies of the particle concentration and non-uniformity at the outlet of the circular pipe are, which is unfavorable to the stable operation of the axial flow pump. Moreover, after the liquid-solid phase flowed through the elbow, the formation of particle aggregates led to a new periodic behavior of solid volume fraction (the frequency is about 10 Hz), and the intensity of flow turbulence was strengthened. As a result, the particle-particle and particle-wall friction and collision were intensified, and the energy dissipation was accelerated.
Wang Handing1,Cheng Zhengzai1,Tang Ming2 et al. Unsteady State Analysis of a Polypropylene Loop Reactor Based on CFD Simulation[J]. 化学反应工程与工艺, 2018, 34(5): 424-430.
Wang Handing1,Cheng Zhengzai1,Tang Ming2 et al. Unsteady State Analysis of a Polypropylene Loop Reactor Based on CFD Simulation[J]. 化学反应工程与工艺, 2018, 34(5): 424-430.
