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Numerical Simulation of the Flow Field in Alumina Industrial Bag Filter

Author: ZhangDiYu
Tutor: LiuGenFan
School: Huazhong University of Science and Technology
Course: Chemical Process Equipment
Keywords: bag filter Fluent flow field numerical simulation
CLC: X701.2
Type: Master's thesis
Year: 2009
Downloads: 70
Quote: 2
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Abstract


In the aluminum metallurgical industry, the aluminum production process could emit a large amount of exhaust gas, and the main component of it is fluoride that is harmful to human and plants. Currently, the dry purification that fluoride and other harmful impurities can be adsorbed by fresh alumina particles is used widely in reducing the exhaust gas’emission. The alumina particles need to be collected by using the bag filter in order to prevent discharged into the atmosphere.In this paper, the study is a model bag filter that used in collecting alumina particles of fluoride dry purification designed by the Guiyang Aluminum and Magnesium Design Institute. There are two ways to study flow field, numerical experiment and computer simulation. This paper referenced by the pilot test done by Guiyang Aluminum and Magnesium Design Institute, numerical simulation about velocity field and pressure field of gas-solid flow in bag filter are analyzed assisted by Fluent, one of Computational Fluid Dynamics (CFD) software, some factors impacting internal flow field of bag filter were found, then made several improvements in order to make the flow field uniform distribution and the dust layer uniform form, increase the filtration efficiency of fluoride adsorption.Some assumptions and simplifications for bag filter were done in order to establish simulation model, the original simulation model was established in accordance with the ratio of 1:1, Standard k-εmodel be used to simulate its internal gas flow field and discrete-phase model be used to simulate trajectories of alumina particles. Simulation results show that: the main factor causing the internal flow field non-uniform is that the movement direction of the internal airflow in bag filter has a wide-angle change, without diversion devices, airflow impact directly the bag filter box, the internal baffle and the bag to form a non-uniform flow field, so the dust layer was damaged seriously and non-uniform form, reduced the efficiency of fluoride adsorption.Three improvements: to change the air inlet structure, set some diversion-leaves in channel; set some diversion-leaves below the bag room; set some bluff body below the bag room. Simulation results show that: The first improvement could improve the uniform distribution of the flow field effectively; the second method is better than third.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Smoke and dust
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