Study On Reducing Pressure Loss And Increasing Separation Efficiency Of FCC Cyclone

At present,the domestic catalytic cracking cyclone separator and its design technology are at the international advanced level,which is completely comparable to foreign separator technology.The separation efficiency can meet the needs of a catalytic cracking unit to recover catalyst and maintain the production of the unit.However,with the increasing domestic requirements for energy saving emission reduction and extended operating cycle,there are still problems in the catalytic cracking process that the pressure drop of the two-stage cyclone separator of the regenerator needs to be further reduced,and the coking of the vortex finder.This thesis aims to combine the experimental results,numerical simulations and theoretical calculations based on the catalytic cracking cyclone,which studies the "guarantee efficiency and drag reduction" of double inlet and slotted vortex finder cyclone separator.The contents and conclusions of the thesis are as follows:(1)The experimental results of the equal-area double inlet PLS Type A separator show that the efficiency of the PLS Type A separator is increased and the pressure drop is slightly reduced after changing the PLY single inlet to the double inlet;with the diameter of the PLS Type A separator vortex finder increasing,separation efficiency and pressure drop are gradually reduced;(2)The experimental results of the non-equal-area double inlet PLS Type B separator show that the smaller the inlet and the vortex finder of the PLS Type B separator,the higher the separation efficiency increases,and the lower the pressure drop decreases;that is,as the inlet width or the diameter of the vortex finder increases,the separation efficiency of PLS Type B gradually decreases,and the pressure drop also gradually decreases;(3)The experimental results of the slotted vortex finder separator PLS show that the diameter of the lower part of the PLS separator conical vortex finder is reduced while increasing the slot area and increasing the insertion depth can increase the separation efficiency and greatly reduce the pressure drop;the same lower part diameter of the slotted conical vortex finder separator can greatly reduce the pressure drop,but the efficiency is also slightly reduced;that is,the performance of the PLS separator is related to the diameter of the vortex finder and the slot area of the vortex finder;(4)The numerical simulation results of the slotted vortex finder cyclone PLS show that the presence of the slotted vortex finder reduces the tangential velocity of the separation space,so the separation efficiency is slightly reduced;the tangential velocity and axial velocity inside the vortex finder are greatly reduced,while the kinetic energy loss in the vortex finder is reduced,and the overall static pressure value in the separator is greatly reduced,so the pressure drop of the separator is greatly reduced;(5)The calculation of the pressure drop performance model of the double inlet and slotted vortex finder separator shows that the existing pressure drop calculation formulas cannot accurately predict the pressure drop of the double inlet and slotted vortex finder cyclone.The revised pressure drop model can accurately predict the pressure drop of the dual inlet and slotted vortex finder separators respectively within a lower error range,which improves the prediction ability of the model.