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On the minimum ignition energy (MIE) for propane/air.

R K Eckhoff1, M Ngo, W Olsen

  • 1Department of physics and technology, University of Bergen, Allegaten 55, NO-5007 Bergen, Norway. rolf.eckhoff@ift.uib.no

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Summary

Researchers determined the minimum ignition energy (MIE) of propane/air mixtures using a standard ASTM spark generator. Results suggest classical MIE values may be overly conservative, with new data indicating higher energies are required for ignition.

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Area of Science:

  • Chemical Engineering
  • Combustion Science
  • Safety Engineering

Background:

  • The determination of Minimum Ignition Energy (MIE) is crucial for assessing the flammability of gases and vapors.
  • Standardized methods like the ASTM spark generator are used, but statistical procedures for data analysis are often lacking.
  • Classical MIE values, such as those by Lewis and von Elbe, may be based on conservative ignition criteria.

Purpose of the Study:

  • To build and utilize a standard ASTM spark generator for MIE determination.
  • To investigate the MIE of propane/air mixtures under atmospheric conditions.
  • To compare MIE values derived from different statistical procedures and assess the conservatism of existing data.

Main Methods:

  • Construction of a standard ASTM spark generator.
  • Performance of MIE measurements for propane/air using the generator.
  • Application of the "highest-possible-border-line" procedure for data analysis.
  • Utilisation of linear and logistic regression analysis to determine ignition probabilities.

Main Results:

  • An MIE of 0.48 mJ was obtained for propane/air using the "highest-possible-border-line" method.
  • This value is consistent with previous findings (0.46 mJ) but significantly higher than the classical Lewis and von Elbe value (0.25 mJ).
  • Regression analyses indicated spark energies for 1% ignition probability were 0.40±0.06 mJ (linear) and 0.45±0.08 mJ (logistic), both higher than 0.25 mJ.

Conclusions:

  • The adopted statistical procedure yields MIE values comparable to prior research.
  • Classical MIE values might be unnecessarily conservative due to potentially low ignition probability criteria.
  • Further investigation into MIE determination methodologies is warranted to ensure accurate safety assessments.