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为了模拟风口回旋区内焦炭颗粒的运动情况,建立了DEM-CFD耦合模型。模型充分考虑了颗粒与气体之间的曳力、压力梯度力、虚假质量力、升力等相间力,对回旋区形成过程及大小进行了颗粒尺度的分析,用数值模拟的手段获得风口回旋区颗粒运动的回旋趋势,得到此处颗粒的速度矢量场、气相体积分数、颗粒速度标量云图。结果显示4s时回旋区在风口前形成且稳定,靠近回旋区中心颗粒运动速度最大,远离回旋区中心的颗粒速度减小。计算结果同物理模拟的结果是一致的。
In order to simulate the movement of coke particles in the tuyere raceway, a DEM-CFD coupled model was established. The model takes full account of the drag force, pressure gradient force, false mass force, lift and other phase forces between the particles and the gas, and analyzes the formation process and size of the convolution zone on a particle scale. By numerical simulation, The tendency of the movement of the movement, get the particle velocity vector field here, the volume fraction of gas, particle velocity scalar cloud. The results showed that the convolution zone formed and stabilized at the tuyere at 4 s, the particle velocity near the center of the convolution zone was the maximum, and the particle velocity away from the center of the convolution zone was decreased. The results are consistent with the results of physical simulation.