Development And Performance Research Of A Dust Removal Device For Magnetic Suspension Bed

With the rapid development of industrialization in China, these industries causeserious pollution of the environment, resulting in a lot of harmful material such as dustparticulates. Dust removal technology becomes more and more attention. In order toimprove environment quality of human survival, dust removal technology develops rapidlysince the20th Century. A variety of new type dust removal technologies were put forward.The advantages of granular bed filter were outstanding, such as high-temperature resistantand corrosion resistant. Granular bed filter widely was used the integrated gasificationcombined cycle (IGCC) and advanced pressurized fluidized-bed combustion (PFBC)technologies, a promising technology for hot gas clean-up. Based on characteristic ofgranular bed filter, this paper proposed dust removal technology of magnetic floating bed.It selected different size of ferromagnetic material as filter medium, and applied magneticfield to forming floating bed. Magnetic floating bed device could ensure an extremely highcleaning efficiency, and have some advantages of continuous operation, simple andflexible structure. This device could adapt to all kinds of dust removal process.The characteristics of granular bed filter were analyzed in order to find optimalparameters of a new-type magnetic floating bed filter. This paper begins and carried onfollowing several aspect research work. First, stable floating bed is researched withmagnetic material of the magnetic intensity and the coercive force, including the electriccurrent intensity, magnetic field intensity and bed height. Second, dust removal mechanismis studies that base on the gas-solid flow. According to the conditions of the floating bedformation, main body structure of the magnetic floating bed device and the relatedequipment is designed and selected, such as electromagnetic coils, DC power supply, airblower, gas flowmeter, differential pressure gauge. Third, the magnetic floating bed dustremoval device performance is studied on various parameters, and the efficiency and bed pressure drop are obtain in different filtration of the air volume, the size of the filtermedium and magnetic field intensity.The results showed that the magnetic floating bed stability is associated with magneticfield intensity and size of the filter material. When the magnetic field intensity is greaterthan240Gs, the floating bed is stable. The floating bed which is composed of particle sizeof60mesh is more stable than that of particle size of40mesh. For60mesh particles,while the original bed height is40mm, and magnetic field intensity is300Gs, and the airflow ranges from50m3/h to135m3/h, the bed height keeps increasing up to130mm, andthe pressure drop ranges from1362Pa to2441Pa. When the air flow is110m3/h, itsparticle collection efficiency is best. The dust removal efficiency could reach to99.34%atan optimum magnetic field intensity of300Gs with volume flow rate of110m3/h and dustconcentration of20g/m3.This thesis provides certain reference value for design and research work to magneticfloating bed device as well as granular layer filter. With this study, the foundation wasestablished for the dust removal technology in a magnetic floating bed column to hightemperature gas.