| The cyclone is a kind of gas-solid separator applied to grasp the dust from the flow air by using centrifugal force caused by rotation dust gas. Cyclone is widely used in chemical petroleum, metallurgy, construction, mining, machinery, textile and other relative industries with the advantage of simple structure, no moving parts, easy maintenance and low cost. Bypassed cyclone separator is also a separator that spiral bypassed chamber is appended to ordinary separator.Numerical simulation of bypassed Cyclone Separator can be obtained by using computational fluid dynamical software FLUENT.Firstly, gas phase simulation can be established based on the anisotropic turbulence model (RSM) as well as QUICK differential format and PRESTO pressure interpolation format in bypassed cyclone separator. Temperature distribution inside of separator can be obtained, meanwhile velocity distribution of inside of the separator and spiral bypassed chamber can also be calculated out as well as pressure distribution and pressure drop, even more turbulence distribution of flow field, Reynolds stress and secondary distribution can be figured out, all of which mentioned above can suggest the influence of bypassed chamber on gas phase distribution.Secondarily, this paper focuses on gas-solid two-phase simulation in bypassed cyclone separator. Discrete phase stochastic model and phase coupling model can be applied to simulate the solid phase, which can finally draw the particle trajectories in the separator and figure out the influence of gas phase flow field on solid phase. The author also deals with the influence of operating parameters on separator efficiency such as inlet velocity, flow rate and particle concentration.Thirdly, analysis the impact of structure parameters on separator efficiency by changing the aspect ratio of bypassed cyclone inlet and cone taper. Feasible structure optimization method can be obtained by comparison of separator performance between original structure and changing structure. |
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