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**Harvard**

Sette, E., Gómez García, A., Pallares, D. och Johnsson, F. (2012) *Quantitative evaluation of inert solids mixing in a bubbling fluidized bed*.

** BibTeX **

@conference{

Sette2012,

author={Sette, Erik and Gómez García, Alberto and Pallares, David and Johnsson, Filip},

title={Quantitative evaluation of inert solids mixing in a bubbling fluidized bed},

booktitle={21st International Conference on Fluidized Bed Combustion},

abstract={This paper presents a method to evaluate the lateral mixing processes of bed material in bubbling fluidized beds. The method combines experiments and mathematical modeling and has the aim to constitute a tool for the investigation of the complex solids mixing phenomenon in fluidized bed units. The experimental method used is based on indirect measurements of a tracer agent. A batch of tracer is fed in one corner of the bed and the amount of tracer agent which traversed the bed is measured over time in a corner, diagonally opposite to the tracer feed point. The mathematical model is based on solving a diffusion-like partial differential equation describing the transient lateral dispersion of particles. From this, values of the lateral dispersion coefficient can be obtained.
The method is applied to evaluate the lateral solids mixing in a fluid-dynamically downscaled 3-dimensional cold model with cross-sectional dimensions of 0.3 m x 0.3 m. The cold model can be operated with a variable bed height up to 0.16 m. Since the cold model is designed according to Glicksman’s full set of scaling laws the fluid dynamics is assumed to resemble that of an industrial-scaled bubbling fluidized bed operated at 900°C with cross-sectional dimensions of 1.5 m x 1.5 m and bed heights up to 0.8 m. The results show good qualitative agreement between experimental results and the mathematical modeling and it is concluded that the macroscopic lateral solids mixing behavior in the bed geometry investigated can be described by a diffusion-like partial differential equation. Four superficial gas velocities are investigated and the lateral dispersion coefficients obtained are found to increase steadily over the range of the superficial velocities investigated.
},

year={2012},

}

** RefWorks **

RT Conference Proceedings

SR Electronic

ID 155529

A1 Sette, Erik

A1 Gómez García, Alberto

A1 Pallares, David

A1 Johnsson, Filip

T1 Quantitative evaluation of inert solids mixing in a bubbling fluidized bed

YR 2012

T2 21st International Conference on Fluidized Bed Combustion

AB This paper presents a method to evaluate the lateral mixing processes of bed material in bubbling fluidized beds. The method combines experiments and mathematical modeling and has the aim to constitute a tool for the investigation of the complex solids mixing phenomenon in fluidized bed units. The experimental method used is based on indirect measurements of a tracer agent. A batch of tracer is fed in one corner of the bed and the amount of tracer agent which traversed the bed is measured over time in a corner, diagonally opposite to the tracer feed point. The mathematical model is based on solving a diffusion-like partial differential equation describing the transient lateral dispersion of particles. From this, values of the lateral dispersion coefficient can be obtained.
The method is applied to evaluate the lateral solids mixing in a fluid-dynamically downscaled 3-dimensional cold model with cross-sectional dimensions of 0.3 m x 0.3 m. The cold model can be operated with a variable bed height up to 0.16 m. Since the cold model is designed according to Glicksman’s full set of scaling laws the fluid dynamics is assumed to resemble that of an industrial-scaled bubbling fluidized bed operated at 900°C with cross-sectional dimensions of 1.5 m x 1.5 m and bed heights up to 0.8 m. The results show good qualitative agreement between experimental results and the mathematical modeling and it is concluded that the macroscopic lateral solids mixing behavior in the bed geometry investigated can be described by a diffusion-like partial differential equation. Four superficial gas velocities are investigated and the lateral dispersion coefficients obtained are found to increase steadily over the range of the superficial velocities investigated.

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/local_155529.pdf

OL 30