摘要
基于颗粒离散元法,对一种椭圆形密相装填器的催化剂密相装填过程进行数值模拟研究,分析布料盘转速和颗粒直径对装填过程的影响。结果表明:催化剂颗粒装填速度不等于布料盘上方料斗下料速度,而是随着布料盘转速增大而增大,随颗粒直径增大而减小。催化剂颗粒在反应器底部分布的直径范围与颗粒直径大小无关,它随着布料盘转速增大而增大。颗粒与反应器的碰撞是造成颗粒破碎的主要因素。利用该设备装填球形催化剂颗粒时,催化剂床层中心会出现凹陷现象,当颗粒直径较小时,床层中心附近会出现驼峰状的凸起。
The catalyst dense loading of an oval loading device was simulated based on the basic principle of discrete element method （DEM）. The effects of rotational speed of the loader and the radius of the catalyst particles were analyzed. The results showed that the catalyst loading speed was not equal to outflow speed of the hopper, it increased with the increasing of the rotational speed of the loader and decreased with increasing of the radius of the particles. The distribution radius of catalyst in the bottom of the reactor was independent with particle size but increased with the increasing of the rotational speed of the loader. The collisions between particles and the reactor were the main factor to cause breakage. It was also observed when using this device to load spherical catalyst particles that there would be a hollow near the center of catalyst bed and when the particle size was small, there would be a hump-shaped bulge aroud the center of the catalyst bed.
出处
《中国粉体技术》
CAS
北大核心
2011年第6期32-37,共6页
China Powder Science and Technology
关键词
催化剂
密相装填
离散元法
数值模拟
catalyst
dense loading
discrete element method
numerical simulation
