A MODEL FOR PREDICTION OF CARBON COMBUSTION EFFICIENCY IN CIRCULATING FLUIDIZED-BED COMBUSTORS

被引:26
作者
ADANEZ, J [1 ]
DEDIEGO, LF [1 ]
GAYAN, P [1 ]
ARMESTO, L [1 ]
CABANILLAS, A [1 ]
机构
[1] CIEMAT,E-28040 MADRID,SPAIN
关键词
FLUIDIZED BED COMBUSTION; COMBUSTION EFFICIENCY; MODELING;
D O I
10.1016/0016-2361(95)00058-D
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
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.
引用
收藏
页码:1049 / 1056
页数:8
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