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Experiment and Numerical Simulation Study of Side Holds Distributor Fluidized Bed

Author: LinRuiNa
Tutor: LiuGenFan
School: Huazhong University of Science and Technology
Course: Chemical Process Equipment
Keywords: Fluidized bed Air distribution plate Experiment FLUENT Numerical Simulation
CLC: TQ051
Type: Master's thesis
Year: 2011
Downloads: 19
Quote: 0
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Abstract


A relatively large number of experimental studies , numerical calculations for the study and design of the fluidized bed can not only shorten the design cycle and reduce the cost of manpower and resources ; but also quantitative analysis of the flow characteristics in the bed , to make up for the lack of experiments can not be observed and measured . improve studies accuracy . In this paper, a combination of experimental research and numerical simulation , the the study bed gas-solid flow . By cold experiment , summarize the variation of the flow resistance of the air distribution plate with traffic ; research still material layer height and fluid flow and the relationship between the height of the bed pressure drop and bed expansion . The the FLUENT software contralateral hole hood type gas - solid bubbling fluidized bed simulation of the flow field , comparing the cold experimental results to identify the model and method can accurately describe the fluidization characteristics . In order to build a virtual experimental platform through the computer , fluidized bed structure parameters and operating parameters on a computer modified to replace a large number of experimental studies . The simulation results show that the two-dimensional two-phase bed a far cry from the simulation results and experimental . Single-phase three-dimensional model of individual and seven - hood (gas ) simulation results show that the interaction between the hood can not be ignored . Seven hood three-dimensional model , the simulation results show that Syamlal-O'Brien, Wen-Yu and the Gidaspow drag force model and the experimental error ; amended Syamlal-O'Brien drag model can truly reflect the experimental results . Finally, with a 1:1 ratio of the actual model into 3D bed and corrected Syamlal-O'Brien drag model simulation . Static powder bed height of 20mm and 30mm , two sets of data , for example , the analysis of the two assessment indicators , the error of the simulation and experimental results are within 10% , with geometric , physical and mathematical models more reasonable swell height and pressure drop . According to the simulation results, the bubble growth process and qualitative analysis in the bed the bed vortex phenomena . According to the simulation , to modify the air distribution plate opening rate, the research open porosity of the bed pressure drop , the expansion of the height of the bubble growth impact . The analog method , provide a reference for the experimental study of the fluidized bed .

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