Investigation Of The Flow Field In The Cylindrical Three-phase Cyclone With A Vaned Inlet And A Direct-current Outlet And Structural Analysis Of Three-phase Cyclone

Cylindrical three-phase cyclone with a vaned inlet and a direct-current outlet is akey part of WX/4U flue gas desulfurization system. Its main function is to separatethe gas and scrubbing liquid droplets collected dust particles and absorbed sulfurdioxide from venturi scrubber. Knowing its internal flow field structure deeply is helpfor improving the separation efficiency of flue gas desulfurization system andoptimizing the operation performance. In this paper, the internal flow field ofthree-phase cyclone is investigated experimentally and numerically. In addition theexperimental data are compared with that of numerical simulation. And the resultsshow that the numerical method can simulate the gas flow field well and RSM modelis fit for the simulation of the flow field in the three-phase cyclone for its anisotropicproperty. Furthermore the distribution of velocity field and pressure field in thethree-phase cyclone are investigated using RSM turbulent model. The simulationresults found that there is an inversed flow that is unfavorable to separation in thecenter of three-phase cyclone.The influence of the structure of guide vane, cylindrical baffle and discharged pipeon the flow field characteristics of three-phase cyclone has been analyzed using RSMturbulent model. The simulation result shows that prolonging guide vane in thecylinder baffle and reducing guide vane at inwall of cylinder could reduce axialvelocity of gas near the cylinder baffle. If the cylinder baffle length is up to 2100mm,the inversed flow will be weakened. On the other hand, the numerical method canchoose suitable discharged pipe for selected fan. Present discharged pipe is suitablefor present fan. The research about three-phase cyclone's structure provides reliabletheoretical basis for its industrial use.Based on the research of gas phase flow field using RSM model, Lagrange discretephase model is introduced for preliminary research of separation efficiency on gasand droplet. And the result indicates the particle movement in the three-phase cyclonecan be described through numerical simulation. The way that combines theoreticaldeduction and numerical simulation has some instructional sense to separationefficiency that is hard to measured.