Complex heat transfer in furnaces with a circulating fluidized bed / Baskakov A.P., Leckner B., Breitholtz K. // Heat Transfer Research. - 2001. - V. 32, l. 7-8. - P. 343-348.

ISSN:
10642285
Type:
Article
Abstract:
Intensity of heat transfer to screen surfaces in the furnaces with a circulating fluidized bed (CFB) is determined by both radiation and convection of particles. Due to the formation of a thermal boundary layer near the screens the role of radiation decreases and that of convection increases with an increase in concentration of particles in the furnace. Generalization of the data obtained in pilot-full-scale and industrial furnaces with a CFB allowed one to obtain a simple empirical dependence of the furnace-mean coefficient of heat transfer α (W/m2·K) on the volumetric-mean concentration of particles c (kg/m3): α = 85·c0.3.
Author keywords:
Index keywords:
Boundary layers; Fluidized beds; Heat convection; Heat radiation; Heat transfer coefficients; High temperature operations; Industrial furnaces; Particles (particulate matter); Circulating fluidized be
DOI:
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Affiliations Ural State Technical University, Ekaterinburg, Russian Federation; Chalmers Technological University, Göteborg, Sweden
References Breitholz, C., Leckner, B., Heat transfer in circulating fluidized bed boilers - Do we know sufficiently? (1997) Trends in Heat, Mass and Moment Transfer, 3, pp. 85-104; Brewster, M.Q., Effective absorptivity and emissivity of particulate media with application to a fluidized bed (1986) Trans. ASME, 108, pp. 710-712; Borodulya, V.A., Kovenskii, V.I., Radiative power of an inhomogeneous fluidized bed (1984) Inzh.-Fiz. Zh., 26, pp. 276-280; Levdanskii, V.V., Leitsina, V.G., Calculation of radiation flow escaping from a high-disperse layer (1990) Inzh.-Fiz. Zh., 59 (4), pp. 586-593; Baskakov, A.P., Heat transfer in steady-state and circulating fluidized beds (1994) Proc. 1st Russ. Conf. on Heat Transfer, 7, pp. 3-12. , MEI Press, Moscow; Leckner, B., Baskakov, A.P., Radiative heat transfer in circulating fluidized bed furnaces (1997) Powder Technology, 90, pp. 213-218; (1973) Teplovoi Rashchyot Kotel'nykh Agregatov (Normativnyi Metod) (Thermal Calculation of Boiler Units (Standard Method), , Kuznetsov, N. V. et al. (eds.); Energiya Press, Moscow; Johnson, F., Boundary layers-first measurements in the 12th MW CFB research plant at chalmers university Proc. Int. Conf. on Fluidized Bed Combustion, Anthony Canmet Book No. 1031213, 1991; Leckner, B., Andersson, B.-A., Experimental methods of estimating heat transfer in circulating fluidized boilers (1992) Int. J. Heat Mass Transfer, 35, pp. 3353-3362
Correspondence Address Baskakov, A.P.; Ural State Technical University, Ekaterinburg, Russian Federation
CODEN HTREE
Language of Original Document English
Abbreviated Source Title Heat Transfer Res
Source Scopus