The COCO2 product ratio for a porous char particle within an incipiently fluidized bed: a numerical study
✍ Scribed by Mark J. Biggs; Pradeep K. Agarwal
- Book ID
- 104107619
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 966 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
By comparing results generated from an advanced single-particle model with those obtained from experiment, we find reaction does occur within the boundary layer of a stationary char resident within the emulsion phase of a fluidized bed, with the extent of reaction diminishing as superficial gas velocity increases. Comparison also shows that the CO-O2, C-O2 and C~O2 reactions all affect the particle related CO/CO2 product ratio, with the influence of each varying with temperature. These observations help explain the peculiar product ratio/temperature profile recently reported by Linjewile and Agarwal (1995, Fuel 74, 5) and suggest, for the first time, a relationship between the product ratio and char particle size. The model results show that boundary layer reaction influences the heat transfer coefficient associated with a char that is burning within a fluidized bed, and that any correlations which do not explicitly account for this may only serve as an approximation.