Deposit morphology on SiC fibers in methane-acetylene/air laminar diffusion flames

Yu Wang; Qiang Yao

Korean Journal of Chemical Engineering, Vol.24, No.2, 305-310, March, 2007

DOI10.1007/s11814-007-5036-x Export Citation

Deposit morphology on SiC fibers in methane-acetylene/air laminar diffusion flames

Yu Wang, and Qiang Yao^†

Key Laboratory for Thermal Science and Power Engineering, Ministry of Education of China, Tsinghua University, Beijing, 100084, China

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The morphologies of soot deposit on 15 μm diameter silicon carbide (SiC) fibers have been investigated with a scanning electron microscope (SEM) in methane-acetylene/air laminar diffusion flames with co-flowing air. The morphologies are shown to be strongly dependent on the fuels ratio. Two kinds of processes by which mature soot particles are produced were proved to exist in a sooting flame: one is the transition from the condensed-phase deposits; the other is the aggregation of the smaller soot particles (or chains of them) carried along the particle path line. Different transition processes are compared between the present work and previous work done by other researchers that usedpropane/air laminar diffusion flames. It seems the presence of C=C in methane-acetylene laminar diffusion flames is the key factor that causes the difference of transition processes in those two kinds of flames.

Keywords:Deposit Morphology;Diffusion Flame;Soot;SiC Fiber;Particle

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[1] Shim SH, Shin HD, Combust. Flame, 131(1-2), 210 (2002)

[2] Shim SH, Ahn KY, Jeong SH, Keel SI, Shin HD, Appl. Energy, 79(2), 179 (2004)

[3] Frenklach M, Taki S, Durgaprasad MB, Matula RA, Combust. Flame, 54, 81 (1983)

[4] Bertrand C, Delfau JL, Combust. Sci. Technol., 44, 29 (1985)

[5] Rah SC, Korean J. Chem. Eng., 2(1), 1 (1985)

[6] Glassman I, Twenty-second symposium, the combustion institute, Pittsburgh, Pennsylvania, 295 (1988)

[7] Saito K, Gordon AS, Williams FA, Stickle WF, Combust. Sci. Technol., 80, 103 (1991)

[8] Said R, Garo A, Borghi R, Combust. Flame, 108(1-2), 71 (1997)

[9] Choi HK, Park SJ, Lim JH, Kim SD, Park HS, Park YO, Korean J. Chem. Eng., 19(2), 342 (2002)

[10] Choi JH, Ha SJ, Park YO, Korean J. Chem. Eng., 19(4), 711 (2002)

[11] Liu FS, Guo HS, Smallwood GJ, Gulder OL, Combustion Theory Modeling, 7, 301 (2003)

[12] Ryu HJ, Lim NY, Bae DH, Jin GT, Korean J. Chem. Eng., 20(1), 157 (2003)

[13] Oh KC, Do Lee U, Shin HD, Lee EJ, Combust. Flame, 140(3), 249 (2005)

[14] Haynes BS, Wagner HG, Energy Combustion Science, 7, 229 (1981)

[15] Frenklach M, Clary DW, Gardiner WC, Stein SE, Twenty-first symposium on combustion, the combustion institute, Pittsburgh, Pennsylvania, 1067 (1986)

[16] Blevins LG, Renfro MW, Lyle KH, Laurendeau NM, Gore JP, Combust. Flame, 118, 684 (1999)