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Thermal aspects of a circulating fluidized bed with air staging
Author(s) -
Koksal Murat,
Golriz Mohammad R.,
Hamdullahpur Feridun
Publication year - 2005
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.1121
Subject(s) - fluidized bed , heat transfer , fluidized bed combustion , suspension (topology) , injector , mechanics , chemistry , secondary air injection , materials science , thermodynamics , waste management , engineering , physics , mathematics , homotopy , pure mathematics
In this study, effects of air staging on wall‐to‐bed heat transfer were investigated in a laboratory scale circulating fluidized bed (0.23 m ID, 7.6 m high). The bed was operated under ambient conditions with silica sand particles ( d p =89 µm, ρ p =2650 kg m −3 ). Two different designs of secondary air (SA) injectors were used for air staging: radial and tangential. Bed‐to‐wall heat transfer measurements were carried out at three elevations above the SA injection port. The results indicate that similar to non‐SA operation, the heat transfer with air staging depends strongly on the cross‐sectional average suspension density. Tangential secondary injection was found to increase the bed‐to‐wall heat transfer above the SA injection port significantly due to increased suspension density compared with non‐SA operation. Copyright © 2005 John Wiley & Sons, Ltd.