Research On Numerical Simulation And Structure Optimization Of Cyclone Separator

The standard stairmand cyclone separator is widely used in the petrochemical industry,protecting the environment and many other fields.However,because of the defects in the stairmand model,it is necessary to optimize its structure.At the same time,the optimization of the structure of the single-stage cyclone separator is still not perfect,and there are less reports on the two-stage cyclone separator.Therefore,it is necessary to further optimize the structural optimization of the single-stage cyclone separator and the two-stage cyclone separator to ensure high separation efficiency under low pressure drop conditions.This paper first analyzes and optimizes the numerical simulation method used for cyclone separators,then uses the preferred numerical simulation method to perform numerical simulation on the cyclone separator and compares it with the experimental data to ensure the accuracy of the numerical simulation results.It lays the foundation for the study of stairmand type single-stage cyclone separators and two-stage cyclone cyclones.Using the validated numerical simulation method for the variation of the thickness of the built-in wall of the exhaust pipe of the single-stage cyclone separator,the variation of the angle of the wall of the exhaust pipe inside the annulus,the change of the taper angle of the cone,the change of the structure of the different hoppers and the position of the anti-return rounding table analysis of the effect of changes in floor area and its internal flow field and performance.The effect of variations in the thickness of the built-in wall of the exhaust pipe on the performance of the single-stage cyclone separator shows that the built-in wall thickness of 0.025D is optimal for the separation efficiency and can effectively suppress the"short-circuit flow" phenomenon.The effect of angle change in the inner annular surface of the exhaust pipe on the performance of the single stage cyclone separator shows that the separation efficiency of the b2 type separator is optimal and the pressure drop is the lowest;with the increase of the angle of the built-in wall of the exhaust pipe,it helps to reduce "Top gray ring" phenomenon.The effect of cone angle change on performance of a single-stage cyclone separator shows that the cutting particle size of cyclones a2 and b2 is the smallest in each group,and the best separation efficiency.The cutting particle size of a2 and b2 were 5.97%and 6.72%lower than that of the standard stairmand type,respectively,and the pressure drop was increased by 13.7%and 34.5%,respectively.The effect of structural change of the hopper on the performance of the single-stage cyclone separator shows that the hopper structure increases the separation space,which helps to improve the separation efficiency and also helps to reduce the pressure drop;a2 Cyclone separator has the smallest cutting particle size,and the separation efficiency is the most good.The results of the influence of the change in the position and bottom area of the back-convex circular table on the performance of the single-stage cyclone separator show that the increase of the back-convection circular table is beneficial to the reduction of the "backmixing" phenomenon,and the separation efficiency and pressure drop are taken into account comprehensively,and b2 is the best in the simulation of the frequency value.Using the validated numerical simulation method to change the cross-sectional area of the two-stage tandem cyclone connecting channel,the diameter of the exhaust pipe of a two-stage cyclone,the change of the dust outlet diameter of the first and second cyclones,and the first cyclone separation The influence of the extension length of the exhaust pipe and the change of the cylinder diameter of the second stage cyclone on its internal flow field and performance.The effect of the cross-sectional area of the connecting channel on the performance of the two-stage cyclone separator shows that the one-two pressure drop ratio of k7.85+kl0.47 combination is 4:6,the smallest cutting diameter,the separation efficiency and the total pressure drop Is the highest.The results of the influence of the diameter change of the first and second exhaust pipes on the performance of the two-stage cyclone separator show that the diameter of the first and second exhaust pipes with the diameter matching combination of 0.4+0.4 is the smallest,and the separation efficiency and the total pressure drop are the highest.The influence of the one or two level dust discharge diameter on the performance of the two stage series cyclone separator shows that the diameter of the one or two level dust discharge port matching 0.45D+0.3D is the smallest and the separation efficiency is the best,and the total pressure drop is relatively high.The influence of the first step exhaust pipe epitaxial length on the performance of two stage series cyclone separator shows that L5 has the smallest particle size and the best separation efficiency,and the lowest total pressure drop.The results of the effect of the second stage cylinder diameter change on the performance of the two-stage cyclone separator show that the separation efficiency of the D200+D100 combination is the best and the pressure drop is the highest,but the specific choice needs to be considered based on the actual operating conditions.