Journal ArticleDOI
Radial gas mixing in a fast fluidized bed
TLDR
In this paper, a steady-state dispersion model was used to determine the radial gas mixing coefficients in the dilute region of a cold fast fluidized bed, 0.1 m i.d. and 4 m high.About:
This article is published in Powder Technology.The article was published on 1997-12-01. It has received 47 citations till now. The article focuses on the topics: Fluidized bed & Fluidized bed combustion.read more
Citations
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Journal ArticleDOI
A review of gas–solid dispersion and mass transfer coefficient correlations in circulating fluidized beds
TL;DR: In this article, the authors present a summary of the work in these areas as found in the literature dating back to 1949 and provide a critical review to guide the selection of the best correlation(s) in circulating fluidized bed reactors.
Journal ArticleDOI
Numerical investigation of gas mixing in gas-solid fluidized beds
TL;DR: In this paper, a parametric study was conducted to investigate the influence of various parameters on the gas mixing, and the specularity coefficient for the partial-slip solid-phase wall boundary condition had the most significant effect on gas mixing.
Journal ArticleDOI
Computation of gas and solid dispersion coefficients in turbulent risers and bubbling beds
TL;DR: In this article, two types of hydrodynamics models that compute turbulent and bubbling behavior were used to estimate radial and axial gas and solid dispersion coefficients, respectively.
Journal ArticleDOI
A Three-Dimensional Model Frame for Modelling Combustion and Gasification in Circulating Fluidized Bed Furnaces
Kari Myöhänen,Timo Hyppänen +1 more
TL;DR: In this article, a three-dimensional semi-empirical steady state model for modeling combustion and gasification in a large-scale circulating fluidized bed furnace is presented, where the model structure and the main features together with a sample calculation are described.
Journal ArticleDOI
Gas mixing in circulating fluidised-bed risers
TL;DR: In this paper, the main focus was on the radial spread of tracer gas in the core region of the transport zone under different operating conditions, and the results showed that the horizontal gas-mixing rate is quantified by a dispersion coefficient which is above 0.01m 2 /s in the boiler and around 0.005m 2/s in a cold unit.
References
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Journal ArticleDOI
A simplex method for function minimization
John A. Nelder,R. Mead +1 more
TL;DR: A method is described for the minimization of a function of n variables, which depends on the comparison of function values at the (n 41) vertices of a general simplex, followed by the replacement of the vertex with the highest value by another point.
Circulating fluidized bed technology III
P Basu,M Horio,M Hasatani +2 more
TL;DR: In this article, the authors present an account of the'state-of-the-art' of different facets of this technology, including hydrodynamics, heat transfer, combustion, emissions, and new processes and applications.
Journal ArticleDOI
Gas and solid behavior in cracking circulating fluidized beds
TL;DR: In this paper, gas and solid hydrodynamics have been studied in dilute circulating fluidized beds under conditions occurring in catalytic cracking risers, and the axial solid concentration profiles were determined in pilot and industrial scale beds.
Journal ArticleDOI
Gas phase hydrodynamics in the riser of a circulating fluidized bed
TL;DR: In this paper, a core-annular flow model was used to describe the hydrodynamics of a circulating fluidized bed (CFB) using radioactive argon as a tracer.
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