Preparation Of Magnetic Porous Materials And Its Application In Electromagnetic Fine Dust Removal System

As the process of industrialization has developed quickly,the control of industrial production of fine particles attracts more and more people's attention.A set of the new electromagnetic fine dust removal system developed for PM2.5-PM10.The system can dynamically capture the fine particles in the flue gas by driving the magnetic porous media through the moving magnetic field,which not only takes advantage of the high porosity and small pore size of the porous media,but also overcomes the inherent contradictions between dust removal precision and the system resistance in the fixed porous media.In order to realize the controllable movement of the porous media in the travelling magnetic field,the magnetic material is deposited on the porous Ni substrate by magnetic electrodeposition to prepare porous material with high volume magnetic susceptibility.The effect of magnetic field on the microstructure and magnetic properties of Fe/porous Ni magnetic porous composites was investigated.The results show that the magnetic field makes the surface of the deposited magnetic porous media more uniform,the Fe film covers the porous Ni uniformly,the pore structure is smooth,and the saturation magnetization is 29%higher than that without magnetic field.The experimental results showed that the weak magnetic porous media was given strong magnetism by magneto-electrodeposition under the premise of ensuring the porous performance of the weak magnetic substrate.Secondly,the kinetic model of gas-solid two-phase flow for electromagnetic fine dust removal is established theoretically.The Euler-Lagrangian method is used to simulate the trajectories of the magnetic porous media in the electromagnetic fine dust removal,which can provide guidance for the magnetic porous media to capture the fine dust in the dust removal experiment under the magnetic fields.The simulation results show that the moving trajectories of the magnetic porous media are controlled to move in a long distance in the traveling magnetic field under higher magnetic field strength,whereas there is a critical magnetic field strength.The experimental results of the dust removal without magnetic field show that the smaller the diameter of the porous medium,the higher the wind speed,the smaller the mass flow rate of the dust and the larger the mass flow rate of the porous media,resulting in the better the classification efficiency and the total efficiency.Finally,the experimental results of the dust removal under magnetic fields show that with the increase of the magnetic field,the total efficiency of dust removal and the number of dust particles collected are significantly increased and then decreased with the increase of magnetic field intensity.The reason is that as the magnetic field strength increases,magnetic porous media controlled by magnetic field moved longer distance so that the collision probability between the porous media and the dust particles increases.But when the magnetic field strength continues to increase,the magnetic porous media deposited increase,Therefore the probability of collision between the porous media and the dust particles decreases,as is responsible for the experimental results,the dust removal efficiency increases firstly and then decreases at high magnetic field strength.