The use of natural gas pipeline systems for mixed transportation of hydrogen is an efficient and economical method.Studying the evolution of leakage consequences and quantitative risks in hydrogen blending natural gas stations is of great significance for ensuring the safe operation of hydrogen blending pipeline networks.This paper establishes a hydrogen doped natural gas station model,simulates the evolution process of the consequences of hydrogen doped natural gas leakage and diffusion in different scenarios by the FLACS(A fire and explosion simulation software based on computational fluid dynamics)software,and analyzes the influence of such factors as hydrogen blending ratio,leakage aperture,and leakage pressure.Research shows that the range of leakage&diffusion hazards and the radius of fire thermal radiation hazards would decrease with the increase of the hydrogen doping ratio,the risk of leakage would significantly increase with the larger leakage aperture,and the leakage pressure and temperature have little impact on the consequences of leakage under high wind speed conditions.Based on simulated consequences,it conducts a quantitative risk assessment of the jet fire on the hydrogen blending natural gas station and finds that as the hydrogen blending ratio increased,the quantitative risk value decreased.The study provides a reference for the construction and safety maintenance of hydrogen doped natural gas stations.
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