Numerical Simulation on Gas-Solid Flow in Cyclone Separators with Different Heights
Numerical simulations of gas-solid flow in three cyclones of varying heights were performed to fully study the effect of cyclone height on its performance.The Reynolds stress model(RSM)was used to simulate the gas flow field,while the Lagrangian model was used to calculate the particle trajectory.The collection efficiency and gas flow field obtained by numerical simulation are comparable with the experimental results.As compared to cyclone A,cyclones B,and C with higher heights have a maximum improvement in collection efficiency of 13％and 22％respectively.However,the pressure drop reduces gradually.The tangential velocity of gas flow decreases slightly as the cyclone's height rises,but it increases the downward axial velocity and decreases the radial velocity,which is still advantageous for increasing collection efficiency.In addition,the increased collection efficiency with rising cyclone height is also attributed to lower turbulence intensity,smaller shortcut flow,and smaller eccentric circumfluence near the dust outlet.
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