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在二维射流流化床装置中,考察了压力对颗粒和气泡运动的影响规律。通过使用摄像技术详细的记录了压力下气泡的行为,并对其进行了分析,由此解决了较高压力下测量流态化性质较为困难的问题。数值研究通过CFD双欧拉模型模拟了带有V形分布器和中心射流的二维流化床内压力对气泡大小、床的膨胀率和射流深度的影响。实验和理论结果表明,在加压状态下,射流气速和分布板气速对气泡的产生、大小及形状有不同的影响。在较高的操作压力下,射流气速增加,气泡变长;分布器气速增大,气泡则变大;射流高度随着分布器气速的增加而降低。模拟结果与实验数据吻合较好,由此该模型为研究较高操作压力下射流流化床流化性质提供了有利的工具。
In the two-dimensional jet fluidized bed unit, the influence of pressure on the movement of particles and bubbles was investigated. The use of camera technology to record in detail the behavior of bubbles under pressure and analyze them, thus solving the problem of measuring fluidization properties at higher pressures. Numerical studies The effect of pressure in a two-dimensional fluidized bed with a V-shaped distributor and a central jet on the bubble size, bed expansion rate, and jet depth was simulated using the CFD dual Eulerian model. Experimental and theoretical results show that the jet velocity and distribution plate velocity have different effects on bubble generation, size and shape under pressure. Under the higher operating pressure, the jet velocity increases and the bubble grows longer. When the air velocity increases, the bubble size becomes larger. The jet height decreases with the increase of air velocity. The simulation results are in good agreement with the experimental data. Therefore, the model provides a useful tool for studying the fluidized bed fluidization properties under high operating pressure.