ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Atmospheric fluidized-bed combustors (AFBC) operate in the large-particle (〉1 mm) fluidization regime. Characteristics of this regime, combined with the fact that as much as 50% of the coal combustibles are volatiles, result in localization of the devolatilization and combustion of the volatilized gases to the neighborhood of the coal-particle and volatile gas plumes arising from the injector region. The volatile gas plume resulting from the large-particle fluidization dynamics wanders due to pressure fluctuations induced by bubble passage.The purpose of the present work is to determine the impact of these characteristics on the design of AFBC's. This has been accomplished by a linearized analysis of the governing equations to describe the periodic wandering of the volatiles plume diffusion flame and the corresponding fluctuation of the combustion rate. The flame oscillation increases the overall combustion rate above the steady-state value. This increase diminishes with increasing fluctuation frequency until the flame becomes insensitive to the fluctuation in the high frequency limit.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690290308
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