切流式三旋单管内固相颗粒运动规律的数值研究

Numerical Study of Solid Particle Motion Law in Tangential Inlet Cyclone in TSS

采用商用软件Fluent 6.3,利用随机轨道模型对切流式三旋单管内固相颗粒运动轨迹进行了数值模拟,结果表明颗粒运动轨迹随机性较大,对气流的跟随性较好,受湍流脉动的影响较大。颗粒在单管内的逃逸与捕集运动规律的统计结果表明:不大于5μm的颗粒主要在排气管底部和分离筒体发生逃逸,随着粒径的增加,颗粒的分离效率增加,在排气管底部和分离筒体上部逃逸比重增加,而在分离筒体中底部颗粒的逃逸比重减少。总结来说,排气管短路流、分离筒体内旋流夹带逃逸是影响切流式三旋分离性能的主要原因,可以从这些方面进行三旋分离性能的优化与改进。

Making use of Fluent 6.3 software and the stochastic trajectory model, the property of particles in tangential inlet cyclone in TSS were simulated to show that the micro-particles＇ trajectory has great random- ness, good following performance and large influence from the turbulent fluctuation. The statistical results of the motion law of micro-particles in the escape pipe and the cylinder body indicate that the micro-particles less than 5 μm can easily escape from the bottom of exhaust pipes and from the body of cyclone separators; with the increasing of particle diameter, the collection efficiencies rises, including the proportion of particles＇ escape in the bottom of the escape pipe and the top of the cylinder body, but the proportion of particles＇ escape in bottom of the cylinder body decrease.