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Effect of pressure fluctuation on coal combustion in large‐particle fluidized beds
Author(s) -
Bywater R. J.,
Chung P. M.
Publication year - 1983
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690290308
Subject(s) - fluidization , combustion , mechanics , coal , particle (ecology) , plume , work (physics) , fluidized bed combustion , chemistry , diffusion , oscillation (cell signaling) , fluidized bed , thermodynamics , physics , geology , biochemistry , oceanography , organic chemistry
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.