| In order to capture fine particles in the flue gas electromagnetic dust removal system using the magnetic field to control the movement of magnetic porous media and using the rotating magnetic field to separate magnetic porous media from clean flue gas.Preliminary results have been achieved on the use of a traveling magnetic field to capture PM2.5-PM10.In order to further improve the efficiency of capture,it is necessary to optimize the structure of magnetic porous media.The research on the separation of magnetic porous media and clean flue gas by rotating magnetic field is still in its infancy.In order to realize the magnetic separation between magnetic porous media and flue gas,the rotating magnetic field needs to be structurally designed and parameterized for further study magnetic porous media under the coupling of gravitational,dragging and magnetizing force.In this paper,pre-experimental study of the deposition voltage,deposition time,the ratio of the solution on the porous Ni based Fe-Co film on the substrate to explore the formation of homogeneous non-porous alloy film deposition parameters and the use of magnetic deposition in three preparation of porous materials with high magnetic susceptibility under different magnetic fields.Scanning electron microscopy results show that the morphology of Fe-Co/Ni thin films prepared under magnetic field is more uniform and the homogeneity under rotating magnetic field is the best.The results of energy spectrum analysis show that the atomic mass ratio of Fe and Co in the film is more than that under rotating magnetic field Close to 1:1.The crystal structure of Fe-Co/Ni thin films was analyzed by XRD.The peak intensities of 211 in magnetic porous media with magnetic field were significantly enhanced,the grain size increased slightly and the degree of crystallization increased slightly,indicating that the preparation of magnetic deposition Fe-Co alloy film obtained better crystal structure under the premise of ensuring good coverage of the Ni substrate,and it is expected that the volume magnetic susceptibility of the magnetic porous medium is increased.The magnetic properties of the material were measured by using a vibrating sample magnetometer.It was found that the saturation magnetization and the coercive force of the magnetic porous medium prepared under the magnetic field were all improved.The porous Ni with weak magnetic properties had the highest surface area.The ferromagnetic Fe-Co alloy film can better meet the PM2.5 PMG system and achieve the separation of magnetic porous media and clean flue gas.The rotating magnetic field,six-claw permanent-magnet rotating magnetic field,which is used to recover magnetic porous media,is designed.The magnetic field distribution of the permanent magnet is simulated and measured.Based on this,a three-flap rotating electromagnetic field is designed.The Maxwell model is used to simulate the spatial distribution of the magnetic field strength of the rotating electromagnetic field and the magnetizing force of the loaded magnetic porous medium is calculated.The numerical results of the above magnetizing force were applied to Fluent in the form of UDF to simulate the separation of loaded magnetic porous media particles from clean flue gas.The velocity distribution,turbulence structure and pressure loss of continuous phase flow field were studied.The influence of gas inlet velocity,particle diameter and magnetic field intensity on the separation of magnetic porous media was analyzed.The results show that with the increase of magnetic field strength,the separation efficiency of magnetic porous media and clean flue gas increases linearly,which is due to the increase of magnetization force of the magnetic particles.When the magnetic field strength reaches 336.89A/m,complete separation is achieved. |
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