Numerical simulation and structural optimization of flow field in industrial gas-solid fluidized beds based on CFD-PBM
The multi-level geometric structures within a fluidized bed influence the dynamics,thermodynamics,and chemical reactions of the internal fluids.Numerical simulation studies of the flow field inside fluidized beds contribute to understanding their complex flow characteristics,establishing a theoretical basis for optimizing the geometric structure and operating conditions of the fluidized beds,thereby enhancing their mass transfer efficiency and performance.Based on computational fluid dynamics theory,a method for the numerical simulation of the flow field within gas-solid fluidized beds was developed.The study investigated the effects of the geometry of the distributor,the diameter of the bed,and the length of the distributor's brim on the flow field within the industrial gas-solid fluidized bed.On this basis,by integrating the Quadrature Method of Moments,a CFD-PBM coupled model was constructed.Utilizing this model,a numerical simulation method for the fluidization state and agglomeration behavior of nanoparticles in the industrial gas-solid fluidized bed was developed,further validating the influence of barrel diameter on the fluidization state of nanoparticles within the fluidized bed.The study indicated that when the diameter was 260mm,the gas velocity distribution around the distributor was uniform,and the dead zone of airflow at the bottom of the distributor was minimized.When the brim length was half the size of the distributor's outlet,the gas velocity distribution within the fluidized bed was more uniform.
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