The Structural Design And Imulation Research On A New Type Of Coal Slurry Concentration Classifier

In this work,a new classification equipment which can prevent coarse coal slimes from being in flotation process effectively was designed from the point of screening and a new slime water concentrate classification equipment concept was proposed for preventing the fine coal from blocking.A special type self-cleaning screen surface and its was designed based on the problem that exists in the fine coal conventional screening process and the parameters such as the equipment volume and work efficiency were calculated.Base on the conventional screw conveyor,a series of transformation design in order to complete the new slime water concentrated classifier design process,and upon the achievements of researchers both at home and abroad in this stage,the working parameters such as volume and work power be calculated by using the designed size of this new device.The force on the moving and fixed ring was analyzed.It was shown that the movement of the moving ring helps to reduce the resistance of the coal slimes in the screen cut.The ring deformation and stress distribution under the working loads was studied in the method of finite element analysis.The results show thatthe thickness of the moving ring and fixed ring is inversely proportional to the maximum deformation and the maximum stress in the fixed ring is related to its thickness.The ring deformation with different thickness was compared and the results show that the ring deformation with 5cm is the ideal.However the ring with 3 cm can meet the requirement under some conditions.The deformation of spiral roller under the working loads was researched in the method of finite element analysis.The results show that the deformation under the working loads was ideal.Compared the 10mm thickness helical blade deformation with 5mm thickness helical blade deformation,we can found although the deformation of the helical blades of a thickness of 10mm is smaller,but 5mm thickness of spiral blade deformation would be fully meet job requirements;spiral blade screw shaft welding is dangerous section,the maximum stress is generated In the welding position of the spiral blade and the screw shaft.Spiral roller and equipment support vibration characteristics analysis showed that the first six order natural frequency far away from the operating frequency of the actuating device so can judge the equipment in working conditions could prevent resonance generation.Use computational fluid dynamics software FLUENT 12.1 to doing the numerical simulation research of the equipment's internal flow field.The results showed that:the fluid within the equipment from the inlet moving to the discharge port process,the radial velocity and axial velocity of the fluid close to the screw shaft almost not changed,but the axial velocity of the fluid close to the sieve seams falling obviously,at different positions the fluid between sieve slit are all close to Om/s,the radial velocity contours are basically the same;compared the flow field between the rings with the moving ring in different type of motion state,the result shown that:the axial velocity value of fluid has nothing to do with the moving ring motion state,when moving ring in the stationary state,the radial velocity of the fluid between the rings are different vary widely of different phase angle,and moving ring in the motion state can balanced the radial velocity of the different phase angle,so that the radial velocity can be more desirable,it was cause by the moving ring in the process of movement can change the pressure field in the gap between the rings,relative to the moving ring in a stationary state,the pressure field between the ring-chips has been significantly improved.