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Received May 9, 2003
Accepted October 6, 2003
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Modeling Percolative Fragmentation during Conversion of Entrained Char Particles
Istituto Ricerche sulla Combustione - CNR, via Metastasio 17 80125 Napoli, Italy
miccio@irc.na.cnr.it
Korean Journal of Chemical Engineering, March 2004, 21(2), 404-411(8), 10.1007/BF02705428
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Abstract
A numerical model of carbonaceous particle conversion under chemical and external diffusion control is proposed. The model accounts for different classes of particles which undergo chemical conversion in parallel with percolative fragmentation. It applies to typical conditions of entrained flow reactors. The system of algebraic and differential equations has been numerically solved. Results include the total carbon conversion as well as the determination of particle properties along the reactor. The model correctly predicts the change of the conversion rate at varying temperature, initial oxidant concentration and excess oxidant ratio. The influence of percolation parameters is also relevant and claims further investigations for more accurate determination. A comparison with experimental data available in literature is also provided.
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Fuertes AB, Marban G, Chem. Eng. Sci., 49(22), 3813 (1994)
JUNG Y, PARK D, Korean J. Chem. Eng., 5(2), 109 (1988)
Kang S, Heble JJ, Sarofim AF, Beer JM, Proc. Combus. Inst., 22, 231 (1988)
Kerstein AR, Edwards BF, Chem. Eng. Sci., 42, 1629 (1987)
Kerstein AR, Niksa S, Proc. Combus. Inst., 20, 941 (1984)
Liu G, Wu H, Gupta RP, Lucas JA, Tate AG, Wall TF, Fuel, 79(6), 627 (2000)
Marban G, Fuertes AB, Chem. Eng. Sci., 52(1), 1 (1997)
Miccio F, Salatino P, Proc. Combus. Inst., 24, 1145 (1992)
Miccio F, Moersch O, Spliethoff H, Hein KRG, Fuel, 78(12), 1473 (1999)
Mitchell RE, Jacob Akatenuk AE, Proc. Combus. Inst., 26, 3137 (1996)
Risnes H, Sorensen LH, Hustad JE, "CO2 Reactivity of Chars from Wheat, Spruce and Coal," in "Developments in Thermochemical Biomass Conversion," (ed. by A.V. Bridgwater), p. 61-72 (2001)
Sahimi M, Totsis TT, Phys. Rev. Lett., 59, 88 (1987)
Salatino P, Massimilla L, Proc. Combus. Inst., 22, 29 (1988)
Salatino P, Miccio F, Massimilla L, Combust. Flame, 95, 342 (1993)
Senneca O, Chirone R, Masi S, Salatino P, Energy Fuels, 16(3), 653 (2002)
