催化剂浸渍干燥设备的计算流体力学模拟

COMPUTATIONAL FLUID DYNAMICS SIMULATIONS OF IMPREGNATING AND DRYING EQUIPMENT FOR PREPARATION OF CATALYSTS

对用于非固定床的负载型催化剂而言,粒度分布、强度、球形度等质量指标对催化反应过程有重大影响。干燥在炼油催化剂生产中是关键处理工艺之一,对催化剂产品的粒度分布、强度和球形度等指标有重大影响。为了提高催化剂的质量,开发了一种浸渍干燥器。根据工艺要求,建立了一个浸渍干燥器三维几何模型,并应用欧拉-欧拉双流体模型,进行了两相计算流体力学(CFD)模拟计算。通过干燥器内流场和气固两相分布的信息,获得了较优的浸渍干燥器进料管长度,为催化剂浸渍干燥器的设计与放大提供可靠指导。

The quality indexes of catalyst,like particle size distribution,strength and sphericity,have a great influence on the catalytic process,especially for the supported catalysts used in non-fixed beds.Drying is one of the keys to the preparation of catalysts and greatly affects the quality index of catalysts.A coupling equipment of impregnating and drying was developed to improve the catalyst quality.Based on the demands of the process,a three dimensional model for the coupling equipment was established and the two-phase computational fluid dynamics(CFD)simulations were conducted with Euler-Euler model.According to the information of flow field and gas-solid two-phase distribution in the dryer,the optimal feeding tube length was obtained.It provides a reliable guidance for the design and scale-up impregnating and drying equipment of catalyst.