Numerical simulations of gas diffusion and reaction in fractal pores during char combustion

Combustion Science and Technology

Volumn 179, Issue 4, 2007, Pages 695-722

  Chen, Qun ^a   He, Rong ^a   Liang, Zhanggang ^a   Xu, Xuchang ^a   Sato, Jun'ichi ^b  

^a TSINGHUA UNIVERSITY   (China)

^b IHI CORPORATION   (Japan)

Author keywords

Char; Combustion; Fractal

Indexed keywords

COMBUSTION; COMPUTER SIMULATION; DIFFUSION; FRACTAL DIMENSION; PORE SIZE;

FRACTAL PORE MODELS; GAS DIFFUSION; THIELE MODULUS;

GAS DYNAMICS;

EID: 33947156214     PISSN: 00102202     EISSN: 1563521X     Source Type: Journal    
DOI: 10.1080/00102200601057261     Document Type: Article

References (33)

1. Avramov, T., Milchev, A., and Argyrakis, P. (1993) Diffusion in a random medium: A Monte Carlo study. Phys. Rev. E, 47, 2303.
2. Bird, G.A. (1994) Molecular Gas Dynamics and the Direct Simulation of Gas Flows, Clarendon Press, Oxford.
3. Borrelli, S., Giordano, M., and Salatino, P. (1996) Modelling diffusion-limited gasification of carbons by branching pore models. Chem. Eng. J., 64, 77.
4. Burganos, V. and Sotirchos, S.V. (1988) Simulation of Knudsen diffusion in random networks of parallel pores. Chem. Eng. Sci., 43, 1685.
5. Costa, M., Araujo, A., Silva, H., and Andrade, J. Jr. (2003) Scaling behavior of diffusion and reaction processes in percolating porous media. Phys, Rev. E, 67, 061406.
6. Fairbridge, C., Ng, S.H., and Palmer, A.D. (1986) Fractal analysis of gas adsorption on syncrude coke. Fuel, 65, 1759.
7. Friesen, W.I. and Ogunsola, O.I. (1995) Mercury porosimetry of upgraded western Canadian coals. Fuel, 74, 604.
8. Gavalas, G.R. (1981) Analysis of char combustion including the effect of pore enlargement. Combust. Sci. Technol., 24, 197.
9. Gefen, Y., Aharony, A., and Alexander, S. (1983) Anomalous diffusion on percolation clusters. Phys. Rev. Lett., 50, 77.
10. Hayhurst, A.N. (2000) The mass transfer coefficient for oxygen reacting with a carbon particle in a fluidized or packed bed. Combust. Flame, 121, 679.
11. He, R., Sato, J., and Chen, C.H. (2002) Modeling char combustion with fractal pore effects. Combust. Sci. Technol., 174, 19.
12. He, R., Suda, T., Fujimori, T., and Sato, J. (2003) Effects of particle sizes on transport phenomena in single char combustion. Int. J. Heat Mass Trans., 46, 3619.
13. He, R., Xu, X.C., Chen, C.H., Fan, H., and Zhang, B. (1998) Evolution of pore fractal dimensions for burning porous chars. Fuel, 77, 1291.
14. Hurt, R., Sun, J.K., and Lunden, M. (1998) A kinetic model of carbon burnout in pulverized coal combustion. Combust. Flame, 113, 181.
15. Jeans, J. (1952) An Introduction to the Kinetic Theory of Gases, The University Press, Cambridge.
16. Liang, Z.G., He, R., Chen, Q., Xu, X., and Sato, J. Fractal generation of char pores through random walks, Combust. Sci. Tech., 179, 637-661.
17. Larson, R.G., Scriven, L.E., and Davis, H.T. (1981) Percolation theory of two-phase flow in porous media. Chem. Eng. Sci., 36, 57.
18. Levitz, P. (1997) From Knudsen diffusion to Levy walks. Europhys. Lett., 39, 593.
19. McMahon, P.J., Snook, I.K., Moss, S.D., and Johnston, P.R. (1999) Influence of fractal pores on the oxidation behavior of brown coal. Energy Fuels, 13, 965.
20. Mitchell, R.E. (1988) On the Products of the Heterogeneous Oxidation Reaction at the Surfaces of Burning Coal Char Particles. Proc. Combust. Instit., 22, 69.
21. Pfeifer, P. and Avnir, D. (1983) Chemistry in noninteger dimensions between two and three. I. Fractal theory of heterogeneous surfaces. J. Chem. Phys., 79, 3558.
22. Rybak, W., Zembrzuski, M., and Smith, I. W. (1986) Kinetics of Combustion of Petroleum Coke and Sub-bituminous Coal Char: Results of Ignition and Steady-State Techniques. Proc. Combust. Instit., 21, 231.
23. Revathi, S. and Balakrishnan, V. (1993) Analytic calculation of the diffusion coefficient for random walks on strips of finite width: Dependence on size and nature of boundaries. Phys. Rev. E, 47, 916.
24. Sahimi, M., Gavalas, G.R., and Tsotsis, T.T. (1990) Statistical and continuum models of fluid-solid reactions in porous media. Chem. Eng. Sci., 45, 1443.
25. Salatino, P. and Zimbardi, F. (1994) A fractal approach to the analysis of low temperature combustion rate of a coal char. II: Model development. Carbon, 32, 51.
26. Salatino, P., Zimbardi, F., and Masi, S. (1993) A fractal approach to the analysis of low temperature combustion rate of a coal char: I. Experimental results. Carbon, 31, 501.
27. Sherwood, T.K. (1975) Mass Transfer, McGraw-Hill, New York.
28. Simons, G.A. (1983) Role of pore structure in coal pyrolysis and gasification. Progr. Ener. Combust Sci., 9, 269.
29. Smith, I.W. (1982) The Combustion Rates of Coal Chars: A Review. Proc. Combust. Instit., 19, 1045.
30. Smoot, L.D. (1993) Fundamentals of Coal Combustion for Clean and Efficient Use, Elsevier, Amsterdam.
31. Tognotti, L., Longwell, J.P., and Sarofim, A.F. (1990) The products of the High Temperature Oxidation of a Single Char Particle in an Electrodynamic Balance. Proc. Combust. Instit., 23, 1207.
32. Tricker, M.J., Grint, A., Audley, G.J., Church, S.M., Rainey, V.S., and Wright, C.J. (1983) Application of small-angle neutron scattering (SANS) to the study of porosity. Fuel, 62, 1092.
33. Zygourakis, K. and Sandmann, C.W. (1988) Discrete structural models and their application to gas-solid reacting systems. AIChE J., 34, 2030.