Numerical Simulation Of Structure Development And Separation Performance Optimization Of Tornado TSS

Based on Fluent numerical simulation methods,gas-solid two phases flow characteristics in tornado cyclone separator are calculated.Structure optimization and development of inner parts,including the vortex finder,the discharge cone and the spiral part in tornado cyclone,are proposed through flow field optimization,reducing energy consumption and improving separation efficiency.Then,the novel tornado separator with high separation efficiency and low pressure drop is presented.Simulation results indicate that the total pressure drop of benchmark tornado cyclone is higher mainly consisting of the outside of nozzles zone and the stabilization chamber accounting about 49.38% and 46.5%,respectively.Short circuit flow and large eddy current exist in the nozzle zone and the stabilization chamber,threatening the separation efficiency.Diameter of particle that can be collected completely is 10 ?m inferring that separation efficiency of the benchmark tornado cyclone should be further improved.Investigation results of inner part structure optimization and development shows that the conventional slotted vortex finder and slotted discharge cone can enhance separation efficiency but also increase the pressure drop.Based on the above accomplishment,the novel vortex finder,in other words,the vortex finder with slots on the top end,was proposed enabling the separator higher separation efficiency and low pressure drop at 1%~3% rate.Nozzles function as spiral device displaying more advantages over traditional ones and nozzles location angles has critical influence on spiral characteristic.Conclusion indicates that the separator obtains good performance having higher tangential velocity with the horizontal location angle of 55°~60° and the vertical location angle of 40°~45°.Columns,rows and diameter of nozzles influence separator performance through varying nozzles jet area which has direct effects on nozzles spiral characteristics.Firstly,the pressure drop increases inversely in proportion with the increasing of jet area square.Secondly,once the nozzles jet area increases,then the swirling flow intensity,nozzles jet velocity and separation efficiency will decline.Based on the above structure development and performance analysis of inner parts,the novel tornado cyclone separator is proposed.The novel separator is equipped with nozzles of ?90×6 mm located in six rows and two columns and the above novel vortex finder.Compared with the benchmark separator,the pressure drop of novel separator is reduced by 9.28 kPa,meaning while,the novel vortex finder enhances separation performance greatly and the grade efficiency of 1 ?m particle is increased from 28.9% to 68.04%.