The Study Of Gas-Solid Two Phase Flow In Cyclone Separator With Large Eddy Simulations

Recently, cyclone separators have attracted great attention due to their simplicity, high-efficiency and low costs in terms of construction, separation and operation, thus have been widely applied in energy, chemical industry, environmental protection and many other fields. Therefore, taking a deep insight into the influencing factors on flow field and performance of cyclone separator is of great importance. In this dissertation, we use the computational fluid dynamics (CFD) to simulate the gas flow, gas-solid two phase flow in the cyclone separator, the relevant conclusions have been obtained.Firstly, based on the LES model for turbulence flow, we investigated the gas field in the cyclone separator. The results indicated that the mainstream is double vortexes and the axes of vortex core stopped in vertebral segment. Also, the rule of velocity and pressure distribution of gas flow is systematically studied.Then, we use the two-Phase fluid coupling of Discrete Phase Model (DPM) in the Lagrange-coordinate to simulate gas-solid flow in cyclone separator. We focused on the effect of manipulation parameters and structure parameters on separation efficiency. We pointed it out that the separation efficiency is improved with the increasing of particulate injection velocities and concentration. Meanwhile, different particles have different moving tracks. Also, the diameters and insert depth of outlet pipe as well as ash bucket will influence the separation efficiency but a little complicated.Obviously, using the numerical simulation has a considerable significance on cyclone separator in terms of experimental research、 machinery designing and performance optimization.