The Research For Spouted Bed With The Variable-scale Lattice Gas Automata

The development of fluidized process is rapid,with the development of non-cokingironmaking process, the reason is that the raw material of fluidized process is powderore. Follow this trend, the further investigations and researches of two-phase flow havebeen done widely and deeply, owing to the need of designing fluidized reactor. At thesame time, the application of computer technology is today’s mainstream, so thetwo-phase study and computer technology developed the numerical simulation whichhas been the mainstream methods with the experimental research methods together ofgas-solid flow studies. The simulation study of gas-solid flow hydrodynamic propertiesfor designing and scale-up of the reactor is an important guiding role.To contrast the existing numerical simulation model, the lattice gas model with itssuperior computing performance and simple and flexible treatment on boundary havesmany highlight the advantages. Based on the existing lattice gas model and thecharacteristics of solid particulate phase, this paper introduced of the rules of gravityand dissipation and proposed GFLGA model which is different from the fluid phase,this model have been used to simulate the typical hourglass experiments, As the resultof comparing simulated and experimental results, GFLGA model and KM model, wefound that GFLGA model can get the correct result both on qualitatively andquantitatively, thus proving the correctness of the model.Based on the improved GFLGA model, this paper combined GFLGA model andthe traditional lattice gas model developed a gas-solid two-phase flow model which canbe used to the spouted bed, in this model, we learn and improved the previous gas-solidcoupling mechanism, while introducing a variable scale approach to deal the differenceof physical properties between gas-solid phases. Meanwhile we are according to thespouted bed experimental conditions on literature, to study the process of spouted fromboth experiments and simulations, comparing the experimental and simulation resultsfrom changes of porosity, velocity distribution, injection zone speed variation to checkthe model.Comparing simulation results with the experiment show that: it was correctly touse the model to simulate spouted bed, we can easily find spouted zone, annulus zoneand fountain zone in the results which is concordance with the experimental results.simulation calculated the velocity distribution and porosity distribution in experiments results are concordance with the experimental results. So we can consider the variablemetric method can well reflect differences in the physical properties of different phases.In the area of the spouted zone, the axial and radial velocity distribution normalizedresults of particles are consistent with the experimental results and DEM simulationresults.