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Investigation of Measures of Decreasing the Influence of Bubble in Fluidized BedName: Zhang YunaMajor: Environmental ScienceStudent ID : 1314116010Supervisor:RomaHenan Agricultural University December, 2015ContentsAbstractthefluidized bed reactor had more extensive application field. In accordan with the issue of the inpact of bubble in fluidized bed, two approaches were summarized to improve the negative impact that one was improving the fluidization gas velocity, the fluidized bed operation to the development of fast fluidization and anther was adding inner loop within the fluidized bed to improve gas-solid transfer efficiency by restrain or eliminate bubble.Key words:Fluidized bed; Inner-loop; Fast fluidization 1 IntroductionThe fluidized bed reactor is suitable for catalytic and non-catalytic gas-solid, liquid-solid and liquid-solid reaction system, is a reactor on a wide range of industrial applications.The reaction temperature has stabilized, heat strong and continuous catalyst recycling, etc., it is widely used industrial areas, especially the petrochemical industry.Because ordinary bubble bubbling bed in the generation of the bubble phase and emulsion phase to produce low contact efficiency, the impact of mass transfer. andGenerate and grow the bubble was caused by slugging, channeling irregularities occurred. Bubbles in the fluidized bed against the adverse effects of fluidized bed some improvements can be divided into: ① improve the flow of the gas velocity, the fast fluidized development; ② added in the fluidized bed inside the inner-loop.2Fast FluidizationIn recent years, the operation of the fluidized bed to the moving fluidized turbulent, fast and dilute phase conveying fluidized state high velocity state development. Compared with the low-speed fluidized, fast fluidized exhibit significantly different and good operating characteristics.When the fluid through the growth speed of the device, the fluid and the relative velocity of solids will also incre