Estimation of Solids Mixing in a Fluidized-Bed Combustor

作者: Fredrik Niklasson , Henrik Thunman , Filip Johnsson , Bo Leckner

DOI: 10.1021/IE020173S

关键词: Fuel mass fractionThermodynamicsChemistryBoiler (power generation)Fluidized bed combustionMoistureDispersion coefficientMechanicsFluidized bed combustorCombustorFluid dynamics

摘要: A simple method is proposed for the estimation of effective lateral dispersion fuel in a fluidized-bed combustor. The based on combination model drying and devolatilization cross-sectional measurements water concentration above bottom bed during steady-state operation. By correlation particles measured moisture concentrations bed, coefficient determined. This was estimated to be order 0.1 m2/s, which considerably higher than that predicted by most expressions given literature.

参考文章(15)
D. Subbarao, E. Moghaddam, J.E. Bannard, Lateral mixing of particles in fluidized beds Chemical Engineering Science. ,vol. 40, pp. 1988- 1990 ,(1985) , 10.1016/0009-2509(85)80142-1
V. A. Borodulya, Yu. G. Epanov, Yu. S. Teplitskii, Horizontal particle mixing in a free fluidized bed Journal of Engineering Physics. ,vol. 42, pp. 528- 533 ,(1982) , 10.1007/BF00824945
John F. Stubington, Shu W. Chan, Stephen J. Clough, A model for volatiles release into a bubbling fluidized‐bed combustor Aiche Journal. ,vol. 36, pp. 75- 85 ,(1990) , 10.1002/AIC.690360110
D. Bellgardt, M. Schoessler, J. Werther, Lateral non-uniformities of solids and gas concentrations in fluidized bed reactors Powder Technology. ,vol. 53, pp. 205- 216 ,(1987) , 10.1016/0032-5910(87)80095-5
B. Leckner, B.-Å. Andersson, Characteristic features of heat transfer in circulating fluidized bed boilers Powder Technology. ,vol. 70, pp. 303- 314 ,(1992) , 10.1016/0032-5910(92)80066-6
Ping Xiao, Guizhang Yan, Dasan Wang, Investigation on horizontal mixing of particles in dense bed in Circulating Fluidized Bed (CFB) Journal of Thermal Science. ,vol. 7, pp. 78- 84 ,(1998) , 10.1007/S11630-998-0002-4
Johan Sternéus, Filip Johnsson, Bo Leckner, Gas mixing in circulating fluidised-bed risers Chemical Engineering Science. ,vol. 55, pp. 129- 148 ,(2000) , 10.1016/S0009-2509(99)00280-8
HT Bi, JR Grace, None, Flow regime diagrams for gas-solid fluidization and upward transport International Journal of Multiphase Flow. ,vol. 21, pp. 1229- 1236 ,(1995) , 10.1016/0301-9322(95)00037-X
Philipp Schlichthaerle, Joachim Werther, Solids mixing in the bottom zone of a circulating fluidized bed Powder Technology. ,vol. 120, pp. 21- 33 ,(2001) , 10.1016/S0032-5910(01)00342-4
Yan Fu Shi, L. T. Fan, Lateral mixing of solids in batch gas-solids fluidized beds Industrial & Engineering Chemistry Process Design and Development. ,vol. 23, pp. 337- 341 ,(1984) , 10.1021/I200025A026