Abstract

In this paper, hydrodynamics characteristics of carbon nanotube (CNT) particles in a tapered fluidized bed reactor without a distributor are studied using numerical simulation. This experimental study is for comparative analysis between simulation and experiment, which is conducted to verify the reliability of the simulation process. The influence of different operating parameters on the structural characteristics of the gas-CNT particles is analyzed. The results revealed that a higher initial bed height leads to a gradual increase in the particle concentration at each section. With the increase of particle size, CNT particles at each section gradually exhibit the state of “accumulation”. The temperature at the bottom part of a cone is highly sensitive to CNT particle size and the initial bed. With the increase of calculation time, the nitrogen velocity field of nitrogen tends to be stable after 15 s, showing an S-shaped distribution.

摘要

在本文中，使用数值模拟研究了没有分配器的锥形流化床反应器中碳纳米管（CNT）颗粒的流体动力学特性。本实验研究是对仿真与实验进行比较分析，以验证仿真过程的可靠性。分析了不同操作参数对气体-CNT颗粒结构特性的影响。结果表明，较高的初始床层高度导致每个部分的颗粒浓度逐渐增加。随着粒径的增大，各截面的CNT颗粒逐渐呈现“堆积”状态。锥体底部的温度对 CNT 粒径和初始床层高度敏感。随着计算时间的增加，