Study on Leakage and Explosion Law of Valve Chambers of Hydrogen-Doped Natural Gas Pipelines
Blending a certain proportion of hydrogen into natural gas and transporting the mixed gas through existing natural gas pipe-lines is an effective way to transport hydrogen on a large scale.Hydrogen has low ignition energy,wide explosion range,and fast diffusion and combustion speed.The harm of combustion and explosion accidents caused by hydrogen blended natural gas is greater than that of conventional natural gas.In order to discuss the law of the combustion and explosion caused by the leakage of the hydrogen-doped natu-ral gas pipeline valve chambers,the leakage,diffusion,combustion and explosion process of the mixed gas in the confined space was simulated and analyzed using the computational fluid dynamics software FLACS after the flange connection of the gas pipeline is dam-aged.The results show that the higher the hydrogen content in the mixed gas,the longer the ignition time of the gas cloud after the leak-age,and the greater the intensity and damage of the explosion;The intensity of gas cloud explosion in the downwind direction is signifi-cantly stronger than that in the upwind direction;Different valve chamber structures will produce different intensities of explosion effects,and explosion relief wall has a limited effect on reducing the explosion hazard of the valve chamber,and the explosion hazard caused by the open-air valve chamber and shed valve chamber structure is relatively small.
hydrogen-doped natural gaspipeline transporting hydrogenvalve chambercombustion and explosionFLACS
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