Lateral mixing of particles in fluidized beds

Subbarao, Duvvuri; Moghaddam, Elyas M.; Bannard, J. E.

doi:10.1016/0009-2509(85)80142-1

Cited by 6 publications

(7 citation statements)

References 4 publications

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“…Fr n 2 (3) ments 7,11,15 and some derived empirical correlations. 10,12,13 A great deal of work has been carried out, but in most cases the conditions were different from those in a boiler, and the expressions have to be extrapolated to estimate the lateral dispersion coefficient for the present conditions.…”

Section: Dispersion Of Solidsmentioning

confidence: 99%

“…The common view is that the mixing in the bed is caused by bubbles stirring the bed material as they rise through the bed and erupt at the surface, even if a certain mixing also is observed before the onset of bubbling at minimum fluidization velocity . To simplify the treatment of the complex system, the lateral solids mixing in a fluidized bed is commonly described as a random walk process, averaged by the diffusion equation − where C is the concentration of tracer particles and D sr is the lateral dispersion coefficient. Equation 1 is easy to solve numerically, once the geometry with the boundary conditions and D sr are defined.…”

Section: Dispersion Of Solidsmentioning

confidence: 99%

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Estimation of Solids Mixing in a Fluidized-Bed Combustor

Niklasson

Thunman

Johnsson

et al. 2002

Ind. Eng. Chem. Res.

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A simple method is proposed for the estimation of the effective lateral dispersion of fuel in a fluidized-bed combustor. The method is based on a combination of a model for drying and devolatilization of the fuel and cross-sectional measurements of the water concentration above the bottom bed during steady-state operation. By correlation of the drying of the fuel particles and the measured moisture concentrations above the bed, the effective lateral dispersion coefficient of the fuel particles is determined. This coefficient was estimated to be on the order of 0.1 m 2 /s, which is considerably higher than that predicted by most of the expressions given in the literature.

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Section: Dispersion Of Solidsmentioning

confidence: 99%

Section: Dispersion Of Solidsmentioning

confidence: 99%

Estimation of Solids Mixing in a Fluidized-Bed Combustor

Niklasson

Thunman

Johnsson

et al. 2002

Ind. Eng. Chem. Res.

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“…A fluidised bed may contain various types of solids, which in solid fuel conversion applications can be roughly categorised as: the bed materials (also called 'bulk solids'), such as fuel ash, make-up sand or active solids, such as catalysts or sorbents for sulphur capture [1][2][3][4][5][6][7][8][9][10][11]; and fuel particles [12][13][14][15][16][17][18][19][20][21][22][23][24]. Fuel particles are typically larger and lighter than the bulk solids, and their mass fraction typically represents only a small fraction of the total solids inventory.…”

Section: Introductionmentioning

confidence: 99%

Magnetic tracking of a fuel particle in a fluid-dynamically down-scaled fluidised bed

Köhler

Pallarès

Johnsson

2017

Fuel Processing Technology

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“…According to the more complex bubble motion models from Berruti, Scott, andRhodes (1986), Bellgardt (1985), Subbarao, Moghaddam, and Bannard (1985), Shi andFan (1985, 1984), Levenspiel (1969b, 1991), Tajuddin (1976), Hirama, Ishida, and Shirai (1975), Highley and Merrick (1971), Arai, Hasatani, and Sugiyama (1971), Mori and Nakamura (1965), Hayakawa, Graham, and Osberg (1964), the dispersion coe cient in the horizontal direction D X = D Y is set lower by a power of 10 and is assumed to be:…”

Section: Discussionmentioning

confidence: 99%