Research on hydrogen dispersion behavior induced by storage cylinder group failure in oil-hydrogen refueling station
This work aims to investigate the hydrogen leakage and dispersion process caused by the valve panel failure from the storage cylinder group in a new type of oil-hydrogen refueling station,and clearly understand the effects of different influencing factors on the hydrogen dispersion behavior.In this work,a full-scale model of an oil-hydrogen refueling station was built based on real scenarios,and numerical simulations were carried out in a CFD-based simulator tool.Compared with various numerical scenarios,hydrogen dispersion behaviors were discussed under different leakage sources and ambient wind conditions.Meanwhile,the emergency treatment plans with different accidental scenarios from accident consequences were proposed in this work accordingly.The current results indicate that the leaked hydrogen movement generates an under-expanded jet along the center line and forms a high-concentration distribution of explosive hydrogen cloud around the leakage source when a small rupture occurs in the hydrogen storage cylinder group.With the increasing rupture sizes,the hydrogen dispersion forms a hydrogen/air mixture cloud in a region far away from the hydrogen storage cylinder group within a short time.The changes in leakage directions in the hydrogen storage cylinder group immediately affected the characteristic variations of hydrogen dispersion behavior,which suggests the distribution region of the hydrogen/air mixture cloud has changed significantly.The hydrogen dispersion process in the horizontal orientation mainly considers the obstacles of devices and equipment in the oil-hydrogen refueling station,while the vertical downward dispersion mode leads to a wider range of high-concentration hydrogen dispersion distribution.With the enhancement of ambient wind and layout complexity of oil-hydrogen refueling stations,the concentration of hydrogen dispersion in local areas rises.As a result,the hydrogen dispersion radius of the horizontal area with the downwind increases,while hydrogen dispersion height in the vertical area decreases,and the hydrogen/air mixture cloud tends to move towards the downwind area of the oil-hydrogen refueling station.
safety engineeringhydrogen safetyhydrogen leakagedispersion behavioroil-hydrogen refueling station
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