Effects Of Three-Product Cyclone Classification Screen Screening Process On Internal Flow Field

The three-product cyclone classification screen is a new and efficient fine-grained coal classification equipment,which has very important research value and application prospect.In this paper,the internal flow field of the three-product cyclone classification screen is taken as the research content,and the influence of the sieving effect on the internal flow field is analyzed,which is helpful for the follow-up study.In this paper,the internal flow field of the three-product cyclone classification screen is analyzed theoretically.The aim is to select the appropriate calculation model and boundary condition for FLUENT simulation.Through the flow field model established through Solidworks,ICEM pretreatment and FLUENT simulation,flow field sieves and hydraulic grading cyclone internal flow field information is gotten.In this paper,the simulation results of the physical model and the simulation results of the flow field model are used to compare the flow of the three products to verify the correctness of the RSM + VOF model and the boundary condition selected for the flow field model.The three-product cyclone classification screen through the screen of the contrastor and the wall-free hydraulic subdivision of the hydrofoil are found.Since the three-product cyclone classification screen has a screen,the fluid enters from the inlet The fluid motion in the outer swirling flow is more complex than that in the hydrocyclone,so that its internal flow field needs to be longer than the hydrocyclone to stabilize,and the presence of the screen's sieving effect results in the same feed rate 10 m / s,the inlet static pressure of the three-product swirl streamer is 50.6% lower than that of the hydraulic classification cyclone,and the static pressure in the internal flow field is also lower than that in the hydrocyclone.The flow pressure drop is reduced from 48.6kpa of the hydrocyclone to 24.1kpa,and the maximum velocity of the tangential velocity of the three-product cyclone classification screen cone is less than 1m / s,and the range of the angular velocity of the cone The hydrocyclone is much smaller,that is,the centrifugal grading of the three-product cyclone classification screen cone is smaller than that in the hydrocyclone.Finally,the influence of different sieve action intensity on the internal flow field was studied by changing the height of the screen.The three-product cyclone classification screen model with the ratio of diameter to diameter of 2.0 and 1.5 was selected to simulate the column When the ratio is 1.5,the static pressure gradient along the radius is much higher than the static pressure gradient of the cylinder diameter ratio of 2.0 and 2.5,which is very close to the hydrostatic gradient in the cyclone.Secondly,the swirl ratio The maximum tangential velocity in the sieve section is more than 3 times the column diameter ratio of 2.0 and 2.5,the value can reach 2.5-3.5m / s,and the centrifugal force is 0.575 times of the cyclone,and in the presence of the screen,But also to ensure that the cone of the centrifugal force field,so that the sieve sieve sieving and centrifugal classification have been guaranteed.The research results of this paper provide a new perspective for the further study of the internal flow field of the three-product swirl gradation sieves,which provides theoretical guidance for the optimization and technological adjustment of the threeproduct cyclone grading.