Ignition probability of fuel gas–air mixtures due to mechanical impacts between stainless steel components

The ignition probability of gaseous mixtures of acetylene, hydrogen and ethylene with air due to mechanical impacts between stainless steel components was examined for various impact energies. Additionally, the sources of ignitions were identified by infrared high-speed recordings. The stainless ste...

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Bibliographic Details
Published in:Journal of loss prevention in the process industries 2014-11, Vol.32, p.393-398
Main Authors: Holländer, Lars, Grunewald, Thomas, Grätz, Rainer
Format: Article
Language:English
Subjects:
Chromium
Chromium plating
Chromium steels
Energy use
Explosive atmosphere
Fuels
Hot surfaces
Ignition
Ignition probability
Mechanical impact
Probability
Stainless steel
Stainless steels
Steels
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Summary:The ignition probability of gaseous mixtures of acetylene, hydrogen and ethylene with air due to mechanical impacts between stainless steel components was examined for various impact energies. Additionally, the sources of ignitions were identified by infrared high-speed recordings. The stainless steel types used had different chemical compositions in order to investigate the influence of the chromium content on the ignition probability. The investigations reveal different ignition probabilities of the gas mixtures as well as different sources of ignitions depending on the steel type used and the impact energy applied. Impact energies below 126 J resulted in ignition of the gaseous mixture at the hot surfaces of the pin or the plate in most of the cases. At higher energies, initiation of ignition due to abraded particles was more probable when using stainless steel components with lower chromium content whereas the source of ignition was almost exclusively limited to the hot surfaces of pin and plate for the steel with the highest chromium content. However, as opposed to the source of ignition, the probability of ignition could not be correlated to the chromium content of the stainless steel. •Grazing impact experiments of stainless steel were performed.•Mechanical impact of stainless steel components could cause ignition of explosive atmospheres.•The ignition sources at high impact energies depend on material and gas mixture.•The ignition probability could not be correlated to the chromium content.
ISSN:0950-4230
1873-3352
DOI:10.1016/j.jlp.2014.10.009