CFD simulation of solids residence time distribution in a multi-compartment fluidized bed

Abstract The present work focuses on a numerical investigation of the solids residence time distribution (RTD) and the fluidized structure of a multi-compartment fluidized bed, in which the flow pattern is proved to be close to plug flow by using computational fluid dynamics (CFD) simulations. With the fluidizing gas velocity or the bed outlet height rising, the solids flow out of bed more quickly with a wider spread of residence time and a larger RTD variance ( σ 2 ). It is just the heterogeneous fluidized structure that being more prominent with the bed height increasing induces the widely non-uniform RTD. The division of the individual internal circulation into double ones improves the flow pattern to be close to plug flow.

[1]  William Resnick,et al.  Residence Time Distribution in Real Systems , 1963 .

[2]  Olivier Simonin,et al.  Hydrodynamic and solid residence time distribution in a circulating fluidized bed: Experimental and 3D computational study , 2008 .

[3]  E. Ponzi,et al.  Comparison between the dispersion and tanks in series models , 1980 .

[4]  Y. Varma,et al.  A model for residence time distribution in multistage systems with cross-flow between active and dead regions , 1973 .

[5]  Jinjia Wei,et al.  Hydrogen production by supercritical water gasification of biomass: Particle and residence time distribution in fluidized bed reactor , 2013 .

[6]  Cheng Wu,et al.  Solid concentration and velocity distributions in an annulus turbulent fluidized bed , 2015 .

[7]  W. Resnick,et al.  Experimental Study of Residence Time Distribution in Multistage Fluidized Bed , 1965 .

[8]  W. Xin,et al.  Characterization of Pressure Signals in Fluidized Beds Loaded with Large Particles Using Wigner Distribution Analysis: Feasibility of Diagnosis of Agglomeration , 2007 .

[9]  Yingce Wang,et al.  A new drag model for TFM simulation of gas-solid bubbling fluidized beds with Geldart-B particles , 2014 .

[10]  S. Folestad,et al.  Residence time distributions of different size particles in the spray zone of a Wurster fluid bed studied using DEM-CFD , 2015 .

[11]  J. D. Jong.  Vertical air-controlled particle flow from a bunker through circular orifices , 1969 .

[12]  Adeniyi Lawal,et al.  Numerical and experimental studies of mixing characteristics in a T-junction microchannel using residence-time distribution , 2009 .

[13]  S. Rao,et al.  Fluidized bed drying of solids , 1990 .

[14]  Hua Bai,et al.  Modeling flow and residence time distribution in an industrial-scale reactor with a plunging jet inlet and optional agitation , 2008 .

[15]  Y. Setty,et al.  Residence Time Distribution of Solids in a Fluidized Bed , 2008 .

[16]  Yang Liu,et al.  Comparison of numerical simulations and experiments in conical gas–solid spouted bed , 2015 .

[17]  A. Busciglio,et al.  Gas-Fluidization Characteristics of Binary Mixtures of Particles in 2D Geometry , 2012 .

[18]  Y. Setty,et al.  Residence time distribution of solids in a fluidised bed , 1999 .

[19]  O. Levenspiel.  Tracer Technology: Modeling the Flow of Fluids , 2011 .

[20]  K. Krisrnaiah,et al.  Residence time distribution of solids in multistage fluidisation , 1982 .

[21]  Mario Alberto Storti,et al.  Residence Time Distribution Determination of a Continuous Stirred Tank Reactor using Computational Fluid Dynamics and its Application on the Mathematical Modeling of Styrene Polymerization , 2012 .

[22]  Hong-zhong Li,et al.  A structure-based drag model for the simulation of Geldart A and B particles in turbulent fluidized beds , 2015 .

[23]  Wei Zhang,et al.  A Review of Techniques for the Process Intensification of Fluidized Bed Reactors , 2009 .

[24]  Weiming Yi,et al.  CFD simulation and experiment of residence time distribution in short-contact cyclone reactors , 2015 .

[25]  Qingshan Zhu,et al.  Simulation of gas-solid flow in 2D/3D bubbling fluidized beds by combining the two-fluid model with structure-based drag model , 2014 .

[26]  Mingyan Liu,et al.  Onset velocity of circulating fluidization and particle residence time distribution: A CFD-DEM study , 2015 .