Research On The Improvement Of Cyclone Geometry And The Addition Of Internal Components

In this paper,the influence mechanism of the flow field on the separation performance of ultrafine particles in a cyclone separator with improved geometry and added internals is studied.The effective structure improvement is beneficial to the movement behavior of particles and fluid in the regular internal flow field.Therefore,it is necessary to study what changes have taken place in the internal flow field after the change of geometry,and what changes are more conducive to the improvement of separation performance,and what changes are the limiting factors for the improvement of separation efficiency.These studies are helpful to guide the design and improvement of existing separators.(1)The separation effect can be divided into four stages: 1.Annular space flow field,2.Primary separation flow field,3.Backmixing flow field and 4.Secondary separation flow field.The effects of inlet structure,vortex stabilizer and exhaust pipe structure on separation performance and internal flow field were investigated.The inlet structure is studied from two aspects of inlet angle and inlet shape;the vortex stabilizer is studied from three aspects of axial position,size and shape;the research on the exhaust pipe is based on the detailed results of dividing the internal flow field according to the particle distribution and recording the design process.Finally,the embedded exhaust pipe and the top additional common gas collecting chamber are proposed,which are beneficial to improve the separation performance The scheme of calculation.(2)It is found that the factors affecting the secondary separation effect should be discussed from two aspects,one is the residence time of particles,the other is the secondary separation intensity.The axial velocity stagnation weakens the axial velocity near the geometric center,promotes more air flow upward through the high-speed rotating area outside the inner swirl,increases the rotating speed of the upward air flow,and gives full play to the inner swirl The secondary separation ability of swirl.(3)The influence of inlet shape on the separation performance of the separator is shown in the characteristics of each flow stage of the flow field,which mainly affects the tangential velocity,that is,the centrifugal force on the particles.The main positive effect of the inlet zero angle on the internal flow field is that the radial confluence decreases in the primary separation stage,that is,the amount of particles moving with the downflow is larger;the entrance angle also affects the axial velocity stagnation in the secondary separation stage.(4)Although the vortex stabilizer is installed at the bottom of the separation space and the inlet of the material leg,its influence on the flow field of the separator is the whole basin.Vortex stabilizers mainly affect the control of particle concentration and secondary separation strength of secondary dust sources.(5)The structure of double-layer exhaust pipe is put forward,and the outer sleeve exhaust pipe and the embedded exhaust pipe are studied.The design of "bidirectional discharge" structure is conducive to the improvement of separation efficiency.