Measurements and computation of low mass transfer coefficients for FCC particles with ozone decomposition reaction

The mass transfer coefficients and Sherwood numbers for catalyzed fluid cracking catalyst particles were measured and computed in a two-dimensional (2-D) bubbling fluidized bed, with ozone decomposition reaction. The measured and computed Sherwood numbers, using 3- and 2-D kinetic theory based computational fluid dynamics simulations, were of the order of 10−6–10−2. The low Sherwood numbers were in reasonable agreement with the literature data for small particles, at low Reynolds numbers. The computational fluid dynamics simulations showed that it is possible to compute conversions in fluidized bed reactors without using the conventional model with empirical mass transfer coefficients. © 2011 American Institute of Chemical Engineers AIChE J, 2012

[1]  Wei Ge,et al.  Simulation of Heterogeneous Structure in a Circulating Fluidized-Bed Riser by Combining the Two-Fluid Model with the EMMS Approach , 2004 .

[2]  William J. Koves,et al.  Circulation of Geldart D type particles: Part I – High solids fluxes. Measurements and computation under solids slugging conditions , 2011 .

[3]  Tron Solberg,et al.  A three-dimensional simulation of gas/particle flow and ozone decomposition in the riser of a circulating fluidized bed , 2004 .

[4]  Rajamani Krishna,et al.  Comparative analysis of CFD models of dense gas–solid systems , 2001 .

[5]  Dimitri Gidaspow,et al.  Computation and measurements of mass transfer and dispersion coefficients in fluidized beds , 2010 .

[6]  Francine Battaglia,et al.  Effects of using two- versus three-dimensional computational modeling of fluidized beds: Part I, hydrodynamics , 2008 .

[7]  D. Gidaspow,et al.  Circulation of Geldart D type particles: Part II—Low solids fluxes: Measurements and computation under dilute conditions , 2011 .

[8]  Ronald W. Breault,et al.  Mass transfer in the core-annular and fast fluidization flow regimes of a CFB , 2009 .

[9]  Dimitri Gidaspow,et al.  An x-ray-. gamma. -ray method of measurement of binary solids concentrations and voids in fluidized beds , 1987 .

[10]  Wolter Prins,et al.  Mass transfer and influence of the local catalyst activity on the conversion in a riser reactor , 1999 .

[11]  H. Eckstrom,et al.  Gas‐solid contacting with ozone decomposition reaction , 1958 .

[12]  Dimitri Gidaspow,et al.  Effect of electric field on the hydrodynamics of fluidized nanoparticles , 2008 .

[13]  Wenli Song,et al.  Evaluation of downer reactor performance by catalytic ozone decomposition , 2008 .

[14]  O. E. Potter,et al.  Ozone decomposition in a 0.254 m diameter circulating fluidized bed reactor , 1993 .

[15]  R. Jackson,et al.  Frictional–collisional constitutive relations for granular materials, with application to plane shearing , 1987, Journal of Fluid Mechanics.

[16]  Wave propagation and granular temperature in fluidized beds of nanoparticles , 2007 .

[17]  Pornpote Piumsomboon,et al.  Kinetic theory based computation of PSRI riser: Part II—Computation of mass transfer coefficient with chemical reaction , 2009 .

[18]  D. Gidaspow,et al.  A bubbling fluidization model using kinetic theory of granular flow , 1990 .

[19]  Joachim Werther,et al.  SOLIDS CONCENTRATION AND VELOCITY PATTERNS IN CIRCULATING FLUIDIZED BEDS , 1988 .

[20]  Pornpote Piumsomboon,et al.  Kinetic theory based computation of PSRI riser: Part I—Estimate of mass transfer coefficient , 2009 .

[21]  O. Bolland,et al.  DESCRIBING MASS TRANSFER IN CIRCULATING FLUIDIZED BEDS BY OZONE DECOMPOSITION , 2001 .

[23]  Todd Pugsley,et al.  Simulation and experimental validation of a freely bubbling bed of FCC catalyst , 2003 .

[24]  Wei Ge,et al.  CFD simulation of concurrent-up gas-solid flow in circulating fluidized beds with structure-dependent drag coefficient , 2003 .

[25]  Ronald W. Breault,et al.  A review of gas–solid dispersion and mass transfer coefficient correlations in circulating fluidized beds , 2006 .

[26]  Owen E. Potter,et al.  Circulating fluidized bed as a catalytic reactor: Experimental study , 1995 .

[27]  Owen E. Potter,et al.  Experimental investigation of models for fluidized bed catalytic reactors , 1976 .

[28]  Hsiaotao Bi,et al.  Baffle effects on performance of catalytic circulating fluidized bed reactor , 1991 .

[29]  Susan J. Gelderbloom,et al.  CFD Simulations of bubbling/collapsing fluidized beds for three Geldart Groups , 2003 .

[30]  Joachim Werther,et al.  Two‐dimensional model for circulating fluidized‐bed reactors , 1996 .

[31]  M. Syamlal,et al.  Fluid dynamic simulation of O3 decomposition in a bubbling fluidized bed , 2003 .

[32]  S. Therdthianwong,et al.  Modeling and simulation of circulating fluidized bed reactor with catalytic ozone decomposition reaction , 2003 .

[33]  S. Oyama,et al.  Gas phase ozone decomposition catalysts , 1997 .

[34]  D. Gunn.  Transfer of heat or mass to particles in fixed and fluidised beds , 1978 .

[35]  A. Neri,et al.  Riser hydrodynamics: Simulation using kinetic theory , 2000 .

[36]  Jinghai Li,et al.  A multiscale mass transfer model for gas-solid riser flows: Part 1 - Sub-grid model and simple tests , 2008 .

[37]  Francis A. Kvlacki,et al.  Convective diffusion in a parallel plate duct with one catalytic wall—laminar flow—first order reaction: Part II: Experimental , 1967 .