Numerical simulation of horizontal jet penetration in a three-dimensional fluidized bed
Numerical simulation of horizontal jet penetration in a three-dimensional fluidized bed
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DOI：
10.1016/j.powtec.2007.08.007
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发表时间：
2008-05
影响因子：
5.2
通讯作者：
Tingwen Li;K. Pougatch;M. Salcudean;D. Grecov
中科院分区：
文献类型：
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作者：
Tingwen Li;K. Pougatch;M. Salcudean;D. Grecov
在各种工业应用中，经常会遇到将反应物气体作为射流引入流化床化学反应器的情况。了解气体射流产生的气固流动的流体动力学对改进反应器设计和工艺优化具有重要意义。在这项工作中，对单个水平气体射流进入实验室规模的圆柱形气固流化床进行了三维数值模拟。提出了一种比例阻力模型，并将其应用于催化裂化颗粒流化床的模拟中。通过对瞬态模拟结果的分析，研究了流化床内气体和颗粒的流动。得到了不同射流速度下的射流穿透长度，并与已发表的实验数据和经验相关预测进行了比较。讨论了几种经验相关性的预测。数值模拟结果与实验结果吻合较好。
The introduction of reactant gas as a jet into a fluidized bed chemical reactor is often encountered in various industrial applications. Understanding the hydrodynamics of the gas and solid flow resulting from the gas jet can have considerable significance in improving the reactor design and process optimization. In this work, a three-dimensional numerical simulation of a single horizontal gas jet into a cylindrical gas–solid fluidized bed of laboratory scale is conducted. A scaled drag model is proposed and implemented into the simulation of a fluidized bed of FCC particles. The gas and particles flow in the fluidized bed is investigated by analyzing the transient simulation results. The jet penetration lengths of different jet velocities have been obtained and compared with published experimental data as well as with predictions of empirical correlations. The predictions by several empirical correlations are discussed. A good agreement between the numerical simulation and experimental results has been achieved.