Un-ignited and ignited high pressure hydrogen releases: Concentration – turbulence mapping and overpressure effects

Abstract

a b s t r a c tSafety studies for production and use of hydrogen reveal the importance of accurate prediction of the overpressure effects generated by delayed explosions of accidental high pressure hydrogen releases. Analysis of previous experimental work demonstrates the lack of measurements of turbulent intensities and lengthscales in the flammable envelope as well as the scarceness of accurate experimental data for explosion overpressures and flame speeds. AIR LIQUIDE, AREVA STOCKAGE ENERGIE and INERIS join in a collaborative project to study un-ignited and ignited high pressure releases of hydrogen.The purpose of this work is to map hydrogen flammable envelopes in terms of concentration, velocity and turbulence, and to characterize the flame behaviour and the associated overpressure. These experimental results (dispersion and explosion) are also compared with blind FLACS modelling.

Hydrogen jet vapor cloud explosion: A model for predicting blast size and application to risk assessment

“…Figure . shows good agreement for the comparison of the engineering model and FLACS modeling for the 8 kg/s release and Daubech et al for the hydrogen concentration decay on the release centerline.…”

“…Experimental results of INERIS experiment (Daubech et al ) for dispersion are compared with FLACS simulation. As shown in Figure experiments and FLACS v10.4 simulations are in quite good agreement for the hydrogen concentration decay versus the distance:…”

“… Comparison of simulation results with INERIS experiment (Daubech et al ) at three monitor positions (mass flow is 0.245 kg/s). [Color figure can be viewed at http://wileyonlinelibrary.com]…”

“…A number of moderate to large hydrogen jet release VCE tests in unconfined & uncongested geometries have been performed, including those reported by Miller et al , Daubech et al , Grune et al , Willoughby and Royle , Takeno et al , and Chaineaux . The blast load data from these tests have been compared to the results obtained by computational fluid dynamics (CFD) modeling using the FLACS code , and reasonable representations for the peak pressure have been obtained using tailored approaches, although these models have not been able to reproduce the blast wave shape or duration .…”

Thermal hazard analysis of a dehydrogenation system involving methylcyclohexane and toluene

“…Off-site stations are the most common type throughout the world and have had several safety issues, which have been investigated. For example, the leakage and dispersion of compressed or liquified hydrogen have been analyzed both experimentally and using simulations [3,4]. Further, consequence analysis and risk assessment studies of off-site hydrogen fueling stations have been performed to determine the necessary safety measures [5][6][7][8][9].…”