Abstract

Fixed bed reactor as a commonly used catalytic device and adsorption equipment in the chemical industry has attracted widespread attention. This paper presents a simple and feasible method which combines CFD with DEM to simulate the fixed bed reactor with the diameter ratio ranges in 2–8. The variation of the void ratio with different diameter ratios obtained from the model used in this paper was in comparison with the theoretical results derived by de Klerk and Dixon. The maximum error between the simulated results and the theoretical results was less than 10%, indicating that the model used in this study had a high degree of confidence. On this basis, the effects of the diameter ratio on the distribution of velocity and pressure were investigated. The distribution of velocity and pressure at different diameter ratios illustrated that when the diameter ratio was 5, the velocity distribution was uniform, and the pressure drop was relatively insignificant, which was beneficial to the reaction process. The model used in this paper could provide a new and concise method for the design and verification of fixed bed reactor.

摘要

固定床反应器作为化工行业常用的催化装置和吸附设备，受到了广泛的关注。本文提出了一种简单可行的方法，将 CFD 与 DEM 相结合，模拟直径比范围为 2-8 的固定床反应器。从本文中使用的模型获得的不同直径比的孔隙比变化与由 de Klerk 和 Dixon 得出的理论结果进行了比较。模拟结果与理论结果的最大误差小于10%，表明本研究采用的模型具有较高的置信度。在此基础上，研究了直径比对速度和压力分布的影响。不同直径比下的速度和压力分布表明，当直径比为5时，速度分布均匀，压降相对不显着，有利于反应过程。本文所用模型可为固定床反应器的设计和验证提供一种新的、简洁的方法。