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Features of Combustion of Coal Gas Suspensions

  • Nickolai M. RubtsovEmail author
Chapter
Part of the Heat and Mass Transfer book series (HMT)

Abstract

It was shown that the gases evolving during thermal annealing of coal powder have an inhibiting effect on the ignition and combustion of hybrid gas suspension, containing natural gas. Investigation into flammability in oxygen of various types of coal with various content of volatiles at a total pressure of 85 Torr and initial temperatures in the range of  650–750 C has been performed. It is shown that ignition of separate particles of coal powder occurs right after injection of powder with oxygen without gas combustion. Then after an ignition delay the volatiles containing in a coal powder ignite, thus the ignition propagates over reactor volume. The more volatiles the coal powder contains the more intensive ignition is observed. It is shown that hybrid powder gas mixtures (PGM) consisting of soot or graphite powders which do not contain volatiles, and a stoichiometric mixture of natural gas and oxygen, intensively ignite in conditions in which hybrid PGM, consisting of coal powder, and a stoichiometric mixture of natural gas and oxygen, do not ignite. It is shown that unlike graphite, soot powder promotes ignition of a stoichiometric mixture of natural gas and oxygen. Possible scenarios of ignitions occurrence in the mines were analyzed. It is shown that hybrid PGM, consisting of soot powder and the stoichiometric mixture of natural gas and oxygen, intensively ignites in the absence of С10F18, however, in the presence of С10F18 combustion of natural gas is missing, the ignition of separate particles of soot powder is only observed.

Keywords

Hybrid powder gas mixture Coal Mine Volatiles Natural gas Octadecafluorodecahydronaphthalene Soot Graphite 

References

  1. 1.
    Eckhoff, R.K.: Dust Explosions in the Process Industries (ISBN 0 7506 3270 4), 2nd edn, p. 643. Butterworth-Heinemann, Oxford (1997)Google Scholar
  2. 2.
    Seplyarskii, B.S., Kostin, S.V., Ivleva, T.P.: The analytical method of calculation of the time characteristics of the hybrid dust ignition with a heated body. Doklady RAN 394(N5), 1–7 (2004) (in Russian)Google Scholar
  3. 3.
    Neiman, M.B., Egorov, L.N.: Self-ignition of methane-oxygen mixtures. Russ. J. Phys. Chem. 3, 61 (1932) (in Russian)Google Scholar
  4. 4.
    Semenov, N.N.: On Some Problems of Chemical Kinetics and Reaction Ability, 685 pp. Academy of Sciences of the USSR, Moscow (1958) (in Russian)Google Scholar
  5. 5.
    Rubtsov, N.M., Tsvetkov, G.I., Chernysh, V.I., Seplyarsky, B.S.: Influence of Cr(CO)6 and Mo(CO)6 on the critical conditions for ignition and the velocities of flame propagation for the chain-branching oxidation of hydrogen and propylene. Mendeleev Commun. 282 (2006)Google Scholar
  6. 6.
    Haydon, A. The spectroscopy of flames, 1st edn, p 412. Springer (1974)Google Scholar
  7. 7.
    Porter, R.P., Clark, A.H., Kaskan, W.E., Browne, W.E.: A study of hydrocarbon flames. In: Proceedings of the 11th Symposium on Combustion, pp. 907–917. The Combustion Institute, Pittsburgh, PA (1966)Google Scholar
  8. 8.
    d’Hendecourt, L.B., Leger, A., Olofsson, G., Schmidt, W.: The red rectangle—a possible case of visible luminescence from polycyclic aromatic hydrocarbons. Astron Astrophys. 170, 91 (1986)Google Scholar
  9. 9.
    Crowl, D.A., Louvar, J.F.: Chemical Process Safety: Fundamentals with Applications, 430 pp. Prentice-Hall (1990)Google Scholar
  10. 10.
    Rubtsov, N.M., Seplyarskii, B.S., Tsvetkov, G.I., Chernysh, V.I.: Thermal ignition of coal–gas suspensions containing natural gas and oxygen. Mendeleev Commun. 18, 340 (2008)Google Scholar
  11. 11.
    Herzberg, G.: Molecular Spectra and Molecular Structure, Vol. 1, Spectra of Diatomic Molecules, 2nd edn. Van Nostrand, New York (1950)Google Scholar
  12. 12.
    Wainner, R.T., Seitzman, J.M.: Soot diagnostics using laser-induced incandescence in flames an exhaust flows. Am. Inst. Aeronaut. Astronaut. (AIAA) J. 37, 738 (1999)Google Scholar
  13. 13.
    Hastie, J.W.: Fire suppressants. J. Res. Nat. Inst. Stand. Technol. 106, 201 (2001)CrossRefGoogle Scholar
  14. 14.
    Rubtsov, N.M., Tsvetkov, G.I., Chernysh, V.I.: Different effects of active minor admixtures on hydrogen and methane ignitions. Kinet. Catal. 49, 344 (2008)CrossRefGoogle Scholar
  15. 15.
    Rubtsov, N.M., Seplyarskii, B.S., Tsvetkov, G.I., Chernysh, V.I.: Investigation into the ignition of coal powders in the presence of oxygen and natural gas by means of high-speed cinematography. Mendeleev Commun. 22(1), 47 (2012)Google Scholar
  16. 16.
    Rubtsov, N.M., Tsvetkov, G.I., Chernysh, V.I.: Kinetic regularities of solid-phase formation in the branching chain reaction of dichlorosilane oxidation in rf plasma at low pressures and 293 K. Mendeleev Commun. 16, 38–40 (2006)CrossRefGoogle Scholar
  17. 17.
    Rubtsov, N.M., Ryzhkov, O.T., Chernysh, V.I.: Reaction products of dichlorosilane oxidation as studied by IR spectrophotometry. Kinet. Katal. 36(5), 645 (1995) [Kinet. Catal. (Engl. Transl.) 36(5), 589] Google Scholar
  18. 18.
    Franke, H.: Bestimmung der Minderstzudenergie von Kohlenstaub/Methan/Luft Gemisches (hybride Gemische). VDI-Berichte 304, 69–72 (1978)Google Scholar
  19. 19.
    Rubtsov, N.M., Seplyarskii, B.S., Tsvetkov, G.I., Chernysh, V.I.: Thermal ignition of coal powders in the presence of natural gas, oxygen and chemically active additives. Mendeleev Commun. 20, 98 (2010)CrossRefGoogle Scholar
  20. 20.
    King, A.T., Mulligan, B.J., Lowe, K.C.: Perfluorochemicals and cell culture. Biotechnology 1989, 7 (1037)Google Scholar
  21. 21.
    Noto, T., Babushok, V., Hamins, A., Tsang, W.: Inhibition effectiveness of halogenated compounds. Combust. Flame 112, 147 (1998)CrossRefGoogle Scholar
  22. 22.
    Rubtsov, N.M., Seplyarskii, B.S., Chernysh, V.I., Tsvetkov, G.I., Azatyan, V.V.: Pat. Russian Federation 2008117802/15, 07.05.2008Google Scholar

Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Russian Academy of SciencesInstitute of Structural Macrokinetics and Materials ScienceMoscowRussia

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