One of the problems of the hydrogen systems' operational use is the ensuring of these systems' internal safety at hydrogen venting to atmosphere since, during the above procedure, in a number of cases, there is a possibility of air penetration to the vent pipeline and then to the vapor space of system tank that leads to a fire-explosion risk situation and deterioration of product stored in the system. The one-parameter mathematical model, describing a process of atmospheric air penetration into the venting pipeline at the nonstationary mode of gaseous hydrogen venting, has been developed. Based on the mathematical model and experimental data the estimated dependency for stationary mode of hydrogen venting has been obtained. This dependency evaluates the actual process of counter penetration of air flow from atmosphere to the venting vertical diameter of pipeline. It has been found that at hydrogen venting upwards via the vertical vent pipelines the convective component, estimated by the Bodenstein and Archimedean numbers, produces a defining effect on the penetration of air into pipeline. At low velocities of hydrogen venting to atmosphere, it is necessary to apply gas seals excluding the penetration of air into the venting pipes.
Mathematical model for nonstationary regime of gaseous hydrogen outflow from vertical pipelines to atmosphere
Mathematisches Modell für das nichtstationäre Regime beim Ausströmen von Wasserstoffgas aus senkrechten Rohrleitungen in die Atmosphäre
International Journal of Hydrogen Energy ; 24 , 12 ; 1171-1176
1999
6 Seiten, 4 Bilder, 7 Quellen
Article (Journal)
English
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