Thermal-balanced integral model for pyrolysis and ignition of wood

Dekui Shen; Rui Xiao; Mengxiang Fang; Wanki Chow

Korean Journal of Chemical Engineering, Vol.30, No.1, 228-234, January, 2013

DOI10.1007/s11814-012-0098-9 Export Citation

Thermal-balanced integral model for pyrolysis and ignition of wood

Dekui Shen, Rui Xiao^†, Mengxiang Fang¹, and Wanki Chow²

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
¹State Key Laboratory of Clean Energy Utilization, Zhejiang University Hangzhou, 310027, China
²Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China

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The pyrolysis and ignition of wood is of great importance to understand the initial stage of combustion, helping control the occurrence and spread of unwanted building and forestry fires. The development of a thermal-balanced model is introduced for examining the analytical relationship between the ignition time and external heat flux. The critical heat flux, one of the important fire-retardant characteristics of combustible solid, is determined from a correlation study between the ignition time and external heat flux. One of the thermal-balanced integral models, considering the effect of surface heat losses, average absorptivity and moisture content, is employed to give the prediction of surface temperature rise, ignition time and ignition temperature of the Aspen. The results show that the model readily and satisfactorily predicts ignition temperature and ignition time of wood with different moisture contents.

Keywords:Thermal-balanced Integral Model;Ignition;Critical Heat Flux;Moisture Content

[References]

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[1] Moghtaderi B, Fire and Materials., 30, 1 (2006)

[2] Blasi CD, Progress in Energy and Combustion Sciences., 34, 47 (2008)

[3] Babrauskas V, Ignition handbookPublished by Fire Science Publisher (2003)

[4] Lawson DI, Simms DL, British J. Appl. Phys., 9, 288 (1952)

[5] Simms DL, Combust. Flame., 4, 293 (1960)

[6] Simms DL, Margaret L, Combust. Flame., 11, 377 (1967)

[7] Wesson HR, Welker JR, Sliepcevich CM, Combust. Flame., 16, 303 (1971)

[8] Quintiere G, Harkleroad T, New concepts for measuring spread properties, Fire safety and engineering, ASTM STP 882, American Society for Testing and Materials, Philadelphia, 239 (1985)

[9] Mikkola E, WichmanIS, Fire and Materials., 14, 87 (1989)

[10] Moghtaderi B, Novozhilov V, Fletcher DF, Kent JH, Fire Safety Journal., 29, 41 (1997)

[11] Spearpoint MJ, Quintiere JG, Fire Safety Journal., 36, 391 (2001)

[12] Kashiwagi T, Combust. Flame., 44, 223 (1982)

[13] Bilbao R, Mastral JF, Aldea ME, Ceamanos J, Betran M, Lana JA, Combust. Flame, 126(1-2), 1363 (2001)

[14] Bilbao R, Mastral JF, Lana JA, Ceamanos J, Aldea ME, J. Anal. Appl. Pyrol., 62, 63 (2002)

[15] Jassens M, Fire and Materials., 15, 151 (1991)

[16] Shen DK, Fang MX, Luo ZY, Cen KF, Fire Safety Journal., 42, 210 (2007)

[17] Shen DK, Gu S, Luo KH, Bridgwater AV, Fang MX, Fuel, 88(6), 1024 (2009)

[18] Carslaw HS, Jaeger JC, Conduction of Heat in Solids 2nd Ed. Oxford, Clarendon Press (1959)

[19] Moghtaderi B, Novozhilov V, Fletcher DF, Kent JH, J. Appl.Fire Sci., 1996/97, 6, 91

[20] Simms DL, Combust. Flame., 7, 253 (1963)

[21] Janssens M, Use of bench-scale piloted ignition data for mathematical fire models, Proceedings of a conference on fires in buildings, Interscience Communications Ltd., London (1989)

[22] Simms DL, Law M, Hinkley P, The effect of absorptivity on the ignition of materials by radiation, F.R. Note No. 308, Fire Research Station, Borehamwood (1957)

[23] Maclean J, Trans. Amer. Soc. Heat Vent. Engyrs., 47, 1184 (1941)

[24] Bluhme DA, Fire and Materials., 11, 195 (1987)

[25] Mikkola E, Indrek S, Wichman OJ, Fire and Materials., 14, 87 (1989)