径向移动床反应器流场特性及其数学模拟

Mathematical Modeling and Flow Field Characteristics of Radial Flow Moving-Bed Reactors

本文根据主流道变质量流及颗粒床层气固流体力学理论，建立了完整的径向移动床反应器流体力学数学模型，开发了模拟计算床层气相二维流场的一种新的数学方法及相应的计算程序。借此可以模拟计算床层气相压力和轴径向速度的二维分布、内外主流道压力和流速分布以及布气孔道的过孔气速和压降。根据模拟计算结果，提出首先优化设计两主流道截面积分配，然后采用变开孔率设计消除开孔区端效应的两步设计方法。借此实现径向移动床反应器的优化设计及优化操作。

In this paper, an intact mathematical model to describe the hydrodynamic behavior ofradial flow moving-bed reactor based on the multiphase flow theory has been developed. A neweffective algorithm to solve the two-dimensional flow field has also been proposed. Using themathematical model the flow field, including the pressure and velocity distributions and thehydrodynamics of the main flow channels as well, can be calculated for various design and operationparameters. A two-step design procedure has been proposed to realize a uniform distribution of thereactant fluid in the designed radial flow reactors. It provides a theoretical basis and betterunderstanding to the optimum design and operation of the radial flow moving-bed reactors.