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Frontiers of Chemical Science and Engineering >> 2010, Volume 4, Issue 3 doi: 10.1007/s11705-009-0277-3

CFD simulation of jet behaviors in a binary gas-solid fluidized bed: comparisons with experiments

1.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China; 2.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China; 3.Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China; 4.School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK;

Available online: 2010-09-05

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Based on the experimental observation of the fluidization characteristics of solid mixtures (resin and rapeseed) with different densities and sizes, the jet behaviours of the binary system are simulated in a two-dimensional jetting fluidized bed 0.30 m in width and 2.00 m in height. A simple mathematical model, by introducing two additional force terms in both gas and particle phase momentum equations of Gidaspow’s inviscid two-fluid model, is used to explore the effects of jet gas velocity and mixture combination on the jet penetration depth in the fluidized bed with a binary system. Experimental results show that there is a fluidization velocity interval (-) for the resin-on-rapeseed (flotsam-on-jetsam) segregated bed. The simulated jet penetration depth increases with the increase of jet gas velocity and the volume fraction of the flotsam (resin), which is in fair agreement with experimental data. The above findings show that the hydrodynamic model of Brandani and Zhang (2006), by introducing the average physical properties from Goossens et al.(1971), can be used to predict the jet behaviors of a well-mixing binary system.

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