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A model for prediction of carbon combustion efficiency in circulating fluidized bed combustors

✍ Scribed by J. Adánez; L.F. de Diego; P. Gayán; L. Armesto; A. Cabanillas

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
1022 KB
Volume
74
Category
Article
ISSN
0016-2361

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✦ Synopsis

The effects of operating conditions (coal particle size, temperature, excess air and linear gas velocity) on carbon combustion efficiency in a circulating fluidized bed combustor were studied. The operating conditions affected the combustion efficiency of each coal differently. To explain this, a mathematical model was developed. To determine axial voidage profiles the model uses a modified version of the hydrodynamic model of Kunii and Levenspiel, which divides the bed into a dense region at the bottom and a dilute region above. In the dilute region a core-annulus structure with solid dispersion from core to annulus is considered. The model gives good predictions of the effect of the operating variables on carbon combustion efficiencies obtained in a CFB pilot plant burning two different lignites and an anthracite.

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