Practical scaling considerations for dense gas fluidized beds interacting with the air-supply system

Sierra, Christophe; Bonniol, Florian; Occelli, R.; Tadrist, Lounès

doi:10.1016/j.ces.2009.04.042

Cited by 4 publications

(1 citation statement)

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“…Due to the complex flow behavior that characterizes gas-solid systems, a complete description of circulating fluidized bed hydrodynamics remains a challenging task (Detamore et al, 2001). In the absence of alternative methods, scaling rules developed over the last two decades proved to be a reasonable tool for the scale-up and scale-down of fluidization processes (Sierra et al, 2009). As has been noted by Horio (1996), there have been three different approaches to the scaling law of fluidized beds: classical dimensional analysis (e.g., Buckingham π-theorem), differential equations (or, more specifically, non-dimensionalization of the continuum equations that describe multiphase flows) and theoretical solutions and experimental correlations.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Model Scale on Hydrodynamic Scaling in CFB Boilers

Mirek

2016

Braz. J. Chem. Eng.

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-The paper presents the results of experimental verification of the simplified set of scaling parameters for which the particle density as well as the cold model length scale may be chosen independently.The tests were carried out on two large scale 1/10 and 1/20 geometrically similar cold models of the Lagisza 966 MW th supercritical CFB boiler. The proposed set of dimensionless quantities allowed the Lagisza 966 MW th CFB boiler to be closely modeled by cold models. However, the agreement between the hot bed and cold model's suspension density distributions is better for the 1/10 scale cold model. That suggests that the choice of the scale of a cold model is not without effect on the macroscopic movements of solids in the riser. Moreover, the study shows that a simplification of the scaling laws which excludes the very important solid-to-gas density ratio can give acceptable results over a wide range of boiler loadings.

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Section: Introductionmentioning

confidence: 99%