Study On Influence Of The Gas-Solid Two Phase Flow In The Magnetically Fluidized Bed

Controlling and adjusting the bubbles in the fluidized bed by the magnetic field is a new and efficient technology which combines fluidized technology with electromagnetic technology. It has a lot of advantage, such as gas and solid keeping in touch well, stable firmly, good circulate in the selection, no short out in gas and so on. So it has extensive application prospects in a lot of fields, such as chemical industry, energy, environmental protection, living beings and food, etc. The thesis analyses and studies the characteristic of magnetically fluidized bed from theory model, numerical simulation and experiment.First of all, the thesis chose Euler law to set up the theory model of magnetically fluidized bed, and takes simulating solid as fluid into account. Secondly, the method of numerical simulation includes dispersing the equation, dividing the net, defining the boundary condition in model, and choosing FLUENT software to simulate the gas-solid two phase flow characteristic in magnetically fluidized bed. Finally, the thesis also designs the experimental equipment, takes sufficient experimental study about the flow characteristic of the magnetically fluidized bed.Through the numerical simulation and experimental study, we find: The magnetic field has the remarkable influence on the characteristic of gas-solid two phase flow in fluidized bed. Increasing the magnetic field can reduce the perturbation in magnetically fluidized bed and make the bed stable. Under the function of the magnetic field, the bubble growth is suppressed, the fluctuation of pressure drop decreases and pressure drop distributes evenly. At the same gas velocity, the stabilization of fluidized bed is in direct proportion to the magnitude of magnetic intensity. At the same magnetic intensity, the stabilization of fluidized bed is in inverse proportion to the gas apparent velocity. The initial gas fluidized velocity has nothing to do with the magnetic intensity, and relates to the diameter of particle in the magnetically fluidized bed. Magnetic stable zone can exist in the fluidized bed when the magnetic intensity is large enough. Its size is in direct proportion to the magnitude of magnetic intensity, and in inverse proportion to the diameter of particle.