Inventing hydrogen as a commonly used future energy carrier the long term social acceptance as well as the clean energy image strongly depends upon the safety of its applications. The safety characteristics of hydrogen build a special challenge e.g. in the field of combustion engine development. Small impurities from lubricants used in motors and pumps may serve as radical source, strongly influencing the auto ignition temperature of hydrogen. Auto Ignition Temperature (AIT) of Hydrogen-Air mixtures were measured in closed autoclaves made from stainless steel, similar to the closed bomb method described in the European standard EN 1839. Initial pressures of 10 bar(a) and 30 bar(a) of a premixed stoichiometric hydrogen-air mixture were investigated. Auto ignition can be obtained about 100 K below the standard AIT (560 deg C, atmospheric pressure) and 300 K below the standard AIT when contaminated through motor oil. Contamination always arises when lubricants are present, e.g. in case of sliding pieces like pistons. This is important and safety relevant information that carefully should be taken into consideration for the purpose of engineering of hydrogen apparatuses.
Safety characteristics of hydrogen at super ambient conditions: lubricant contamination influencing the auto ignition temperature
Sicherheitskennwerte von Wasserstoff bei Überumgebungsbedingungen: Schmiermittelkontaminationen beeinflussen die Selbstentzündungstemperatur
2006
7 Seiten, 7 Bilder, 2 Tabellen, 23 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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