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Published 31.05.2022.

HYEX Safety participates at Loss Prevention 2022

On June 5-8, HYEX Safety will be in Prague presenting at the 17th EFCE International Symposium on Loss Prevention and Safety Promotion in Process Industries. Process safety professionals, researchers, scientists, academics and practitioners have been meeting on a triennial basis since the first conference in 1974, and we look forward to the 2022 edition. HYEX Safety will be presenting two articles on hydrogen safety, briefly described below. The articles will available for free download, together with articles from recent LPS-conferences, from the digital journal Chemical Engineering Transactions (CET) after the conference.

CFD-modelling of large-scale LH2 release experiments

As a part of zero emission ambitions within the maritime, and possibly within aviation, liquid hydrogen (LH2) will increasingly be used as fuel in the coming years. In that respect it is important to understand safety aspects of LH2, including gas dispersion and explosion properties. The Norwegian Public Roads Administration commissioned large-scale LH2 dispersion and explosion experiments at DNV test site Spadeadam both indoor and outdoor when developing their first LH2-fuelled ferry. In the presented article these experiments are simulated using a CFD- model with the aim to validate a modelling approach for gas dispersion from LH2-releases.

Illustration of the large-scale LH2 dispersion (right) and the corresponding FLACS simulation (left).

CFD study to assess safety aspects of TPRD releases from heavy-duty hydrogen vehicles and trains in tunnels

Heavy-duty vehicles and trains using hydrogen as fuel have significantly larger tanks than smaller fuel cell vehicles (FCVs). The requirement for depressurisation time in case of fire may in any case often be similar, and thus there may be a need to dimension the thermal pressure relief devices (TPRDs) for significantly higher release rates than used in FCVs. This CFD-study assesses to what extent higher TPRD release rates than typically used for FCVs may be applied without compromising safety. The study has been performed together with Vysus Group in collaboration with partners in the MoZEES research centre.

Illustrations of TPRD release simulations for a hydrogen train standing still (left) and at speed (right) inside a tunnel.