CFB密相区大颗粒横向扩散系数的CPFD模拟

发布时间：2018-03-02 17:36

  本文选题：流化床　切入点：密相区　出处：《化工学报》2017年10期 　论文类型：期刊论文

【摘要】：运用一种离散单元法(DEM)计算颗粒流体力学(CPFD)对尺寸为900 mm×100 mm×1200 mm的准三维流化床的密相区大颗粒扩散行为进行研究。模拟之前,依照前人实验研究对CPFD方法进行验证,模拟结果与实验结果符合较好,证明了CPFD方法模拟的有效性。模拟中通过注入示踪粒子的方法来研究大颗粒在密相区中的横向扩散系数,研究了流化风速、颗粒直径对颗粒横向扩散系数的影响。模拟结果显示,气泡是引起密相区内颗粒混合的主要因素;随着流化风速增加,颗粒横向扩散系数变大;随着颗粒直径增大,颗粒横向扩散系数减小。
[Abstract]:Using a discrete element method (DEM) to calculate particle hydrodynamics (CPFDs), the diffusion behavior of large particles in a quasi-three-dimensional fluidized bed with a size of 900mm 脳 100mm 脳 1200mm was studied. Before the simulation, the CPFD method was verified according to previous experimental studies. The simulation results are in good agreement with the experimental results, which proves the validity of the CPFD method. In the simulation, the transverse diffusion coefficient of large particles in the dense phase region is studied by injecting tracer particles, and the fluidized wind speed is studied. The effect of particle diameter on particle transverse diffusion coefficient. The simulation results show that bubble is the main factor causing particle mixing in the dense phase region, the particle transverse diffusion coefficient increases with the increase of fluidization wind speed, and the particle diameter increases with the increase of particle diameter. The particle transverse diffusion coefficient decreases.
【作者单位】： 上海理工大学能源与动力工程学院;清华大学热能工程系;
【基金】：国家重点研发计划项目(2016YFB0600201)~~
【分类号】：TQ021.1
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本文编号：1557540