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The Gas-solid Two-phase Flow Characteristics In The Fluidized Bed And The Numerical Simulation Of The Flow Law

Posted on:2013-10-07Degree:MasterType:Thesis
Country:ChinaCandidate:W G SunFull Text:PDF
GTID:2231330362972095Subject:Chemical Technology
Abstract/Summary:PDF Full Text Request
Gas-solid circulating fluidized bed technology has been widely used in energy source,chemical engineering, petroleum, metallurgy and other industrial fields,This fluidized equipment is more easier for controlling and large-scale, more higher efficiency on heat and mass transfer process, better bed temperature distribution than traditional reaction and combustion devices. Although people had pay more attentions on it for decades years because of its broad application prospects of it,there are lots of difficult for designing,optimizing and magnifying fluidized bed equipments because of an unclear understanding of gas-solid flow law in which is with complexity and non-linear in bed.In-depth knowledge of the characteristics of gas-solid flow in circulating fluidized bed (CFD)is required for design and optimization of equipment, it has been researched by many researchers as most basic fluidized equipment. The method to study fluidized bed always By means of a mathematical model to study the interaction of gas and phase particles, the fluidized processes of bed was discussed.In the same time,the paper used simulating and calculating busibess software of large scale fluid engineering (Fluent) to simulate and study the experimental device,and this paper combine the mechanical drawing software UG and Gambit which is pretreatment software of simulating and calculating of fluid to plot grid,the two-fluid of gas and solid of Eulerian model was adopted,which is known as the small amount of calculation and rigorous theory. Simulation adopted the unsteady and segregated resolver,it can make results bring near with practice.The Gidaspow and Syamlal-O’Brien drag model were chosen to simulate flow field of recirculating fluidized bed to explore flow characteristics and laws of fluidized bed. The simulated result of two drag models was compared.
Keywords/Search Tags:fluidized bed, drag law models, gas-solid two phase fluid, numerical modelsThesis, Appied Research
PDF Full Text Request
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