Petroleum Science >2012,??Issue 1:??93-99 DOI: https://doi.org/10.1007/s12182-012-0188-7
Computational investigation of contractionbehavior in a liquid-solid fluidized bed Open?Access
文章信息
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;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;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;National Engineering Laboratory for Biomass Chemical Utilization, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China
文章摘要
Based on a simple hydrodynamic model proposed by Brandani and Zhang (2006), a case study for solid
particles with a density of 3,000 kg/m3 and a diameter of 2.5×10-3 m is simulated in a two-dimensional
fluidized bed (0.50 m height and 0.10 m width). Due to the continuity of numerical computation, there
is a transition region between two zones of different solid holdups when the liquid velocity is suddenly
changed. The top, middle and bottom interfaces are explored to obtain a reasonable interface height. The
simulated results show that the steady time of the middle interface is more close to Gibilaro’s theory
and suitable for describing the contraction process of a phase interface. Furthermore, the effect of liquid
velocity and particle diameter is simulated in the other two-dimensional fluidized bed (0.10 m height
and 0.02 m width) where the solid particles are glass beads whose properties are similar to those of the
catalyst particles used in the alkylation process. The results also show good agreement with Gibilaro’s
theory, and that larger particles lead to a more obvious bed contraction.
关键词
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Liquid fluidized bed, dynamic bed contraction, CFD simulation