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出口结构对方形旋风分离器性能影响的数值模拟研究

注意：本论文已在《安全与环境学报》2009,9(4):32–37发表
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苏亚欣1，郑安桥1，赵兵涛2
(1.东华大学环境学院，上海201620；2.上海理工大学 动力工程学院，上海200093)

摘 要：利用CFD技术模拟研究了排气管结构对矩形进口方形旋风分离器的阻力和分离特性的影响机理。其中气相模型采用雷诺应力湍流模型(RSM)．颗粒相采用随机轨道模型。首先将计算结果与实验数据作对比，表明模型计算结果可靠。结果表明，分离器内部排气管和分离器壁面间的区域为强旋湍流区，靠近分离器壁面和排气管壁面的区域旋流强度较弱。方形的排气管结构使方形旋风分离器的效率提高而阻力降低。其原因是改变排气管的结构影响分离器内的流动特点和湍动能的分布，从而影响了分离效率和阻力损失。排气管下方的分离器锥体区域出现回流．排气管为圆管时回流的范围和速度较大．导致小颗粒易于随气流向上运动进入排气管逃逸．使分离效率较小；且排气管为圆管时分离器内的湍流动能也较大，是造成阻力损失较大的原因。合理设计分离器的出u结构以改变分离区的湍动能分布是减小能蕈损失的着眼处。
关键词：热能工程；循环流化床；方形旋风分离器；出口结构
中图分类号：TK223.2 文献标识码：A

Numerical simulation of the effect of gas exhaust configuration oil the performance of square cyclone separator

SU Ya-xin1, ZHENG An-qiao1, ZHAO Bing-tao2
（1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620，China；
2. College of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China）

Abstract：In this paper，we are going to present a CFD numerical simulated model on the effect of gas exhaust configuration on the pressure drop and separation efficiency of a square-type cyclone separator．In conducting our research，we applied Reynolds Stress Model(RSM) to simulate the turbulent flow of gas phase and arandom trajectory model to simulate the particle motion．Comparing the numericol results on velocity，grade separation efficiency and pressure drop with the experimental data，the present model and the numerically simulated method are both fit for the simulation of the separator．The numerical results also show that the flow field in the cyclone includes a strong swirling region between the exhaust exit and the separating wall with a weak swirling region near the separator wall．The results of our experiments also indicate that the separation efficiency could be increased with the pressure drop decreased when the gas exhaust configuration changed from acircular tube to a square duct with the same cross section．The chief eau$e leading to the change is that the gas exhaust configuration did influence the distribution of the re-circulation and the local turbulent kinetic energy of the gas phase remains below the gas exhaust inlet inside the cyclone．When the gas exhaust configuration is a round tube．the re-eirculation would take more space and the upward velocity tends also to be higher than those when the gas exhaust configuration is a square duet，which made the small particles move up to the gas exhaust exit and then run out into the open air．The local turbulent kinetic energy of the gas phase also proves higher for a circular gas exhaust than that for a square-shaped outlet exhaust．Since the turbulent movement takes up the energy from the main air current，it would lead to the drop of the pressure．Therefore，a reasonable design of the gas exhaust configuration is the key to achieving a square cyclone separator with low pressure drop and high separation efficiency．
Key words：thermal engineering；circulating fluiclized bed；square cyclone separator；gas exhaust configuration
CLC number：TK223.2 Document code：A
Article ID：1009—6094(2009)04.0032.0637

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