Study on leakage and dispersion simulation of hydrogen station based on FLACS
As hydrogen energy,a clean energy source,is to be developed and utilized on a large scale,the construction of long-distance hydrogen pipelines and related stations along the route is also increasing.To study the dispersion patterns of hydrogen leakage under different conditions,a three-dimensional FLACS model of the hydrogen station was established.Simulations of hydrogen leakage and dispersion were conducted under different leakage pressures,leakage apertures,and leakage temperatures in the presence of obstacles.The dispersion ranges of flammable gas clouds were compared,and the influencing factors were analyzed.The results show that obstacles cause changes in the direction of hydrogen leakage,leading to a rapid increase in the dispersion range.In scenario 7,within 7 s(8 s to 15 s),the area of the flammable gas cloud rapidly increases to 73.3％of the entire station area.The increase of leakage pressure and leakage aperture both result in a larger dispersion range of the flammable gas cloud.For low-pressure leakage at 4 MPa,the change in leakage aperture has a more significant impact,while for large aperture leakage at 100 mm,the change in leakage pressure has a more significant impact.When the leakage temperature increases from 293 K to 353 K,the thermal motion of hydrogen molecules accelerates,but the change in leakage temperature does not significantly affect the dispersion range of the gas cloud.This study can provide a reference for the prevention and control of leakage accidents in hydrogen station.
hydrogen stationleakage dispersionsimulationobstaclesflammable gas clouddispersion range
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