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Experiments on the upper explosion limits of gaseous alkanes-oxygen mixtures at elevated conditions of T and p in a spherical vessel

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This experimental work has been completed in the Institute of Heat Engineering Laboratories of Warsaw University of Technology. The article reports on the explosion pressure data and the influence of chosen physical parameters on the value of the Upper Explosive Limit (UEL) of gaseous alkanes oxygen mixtures. Such explosion behavior data of common gases for different initial conditions are essential for a quantitative risk assessment in many industrial environments. A number of higher alkanes-oxygen mixtures were examined (up to n-butane). Summarized research data is presented in the paper. All the presented data have been obtained from the experiments conducted in a 2.3 dm3 spherical, steel vessel. Exploding wire was used as the mean of ignition source. It released about 0.1 J energy each time. The pressure histories in the combustion vessel have been recorded by means of piezoelectric pressure transducer. The influence of the increased initial temperatures of the tested mixtures on their value of UEL was investigated in the range of 20°C up to 200°C. Further experiments on the influence of elevated pressure, as well as the position of the ignition source, were carried out too. The experiments allowed the authors to find a distinct dependencies in the values of obtained UEL under elevated conditions of pressure and temperature.
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Bibliogr. 6 poz., tab., rys., wykr.
  • Institute of Aviation, Space Technology Department, Al. Krakowska 110/114, 02-256 Warsaw,
  • [1] A. A. PEKALSKI, E. TERLI, J. F. ZEVENBERGEN, S. M. LEMKOWITZ, and H. J. PASMAN, Combustion Institute Proceedings, 30, 1133–1139 (2005)
  • [2] L.G. BRITTON, Two hundred years of flammable limits, Process Safety Progress, 21, 1-11, (2002)
  • [3] K. HOLTAPPELS, V. SCHROEDER, A. KOBIERA, P. WOLANSKI, M. BRAITHWAITE, H.J. PASMAN, Gas explosion safety characteristics and anomalies at unusual conditions, Proceedings of the 12th international symposium on loss prevention and safety promotion in the process industries Edinburgh, UK, (2007)
  • [4] K.K. ELTSCHLAGER, et al. Technical Measures for the Investigation and Mitigation of Fugitive Methane Hazards in Areas of Coal Mining U.S. Department of The Interior Office of Surface Mining, Pittsburgh, 2001
  • [5] D.J. HALLIDAY Investigation of Natural Gas Explosions Forensic Science Service Metropolitan Laboratory, London, 2004
  • [6] J. DWYER, J.G. HANSEL, T. PHILIPS, Temperature Influence on the Flammability Limits of Heat Treating Atmospheres Air Products and Chemicals, Allentown, 2000
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