Study on the scope of impact of consequences of leakage of hydrogen blended with natural gas pipeline

In the context of low-carbon energy transition, Hydrogen blended with natural gas (HBNG) technology has attracted much attention due to its carbon reduction potential, but its leakage risk poses higher requirements for safety control. This study aims to analyze the impact of the consequences of HBNG pipeline leakage. The PHAST software is used to analyze the consequences of leakage accidents with its characteristics, and the role of three factors, namely, hydrogen blending ratio, leakage hole diameter and ambient wind speed, on the range of influence of jet thermal radiation and explosion overpressure is investigated by constructing a physical model and applying numerical simulation, combining the flame cone model and the TNT-equivalent method. The results show that the influence range of jet fire radiation increases with the increase of leakage hole diameter and ambient wind speed, but decreases with the increase of hydrogen blending ratio; the influence range of explosion overpressure increases with the increase of leakage hole diameter, decreases with the increase of ambient wind speed, and increases first and then decreases with the increase of hydrogen blending ratio. Based on this result, the corresponding hazardous and safety zones are delineated. This study can provide some technical support for the development of safety measures for jet fire and explosion accidents caused by HBNG leakage.