Simulation of leakage and diffusion in overhead pure hydrogen/hydrogen-doped pipelines
Hydrogen is a clean energy that is widely and effectively utilized.Pipeline transportation is the main form of hydrogen transportation.However,the explosion range of hydrogen is 4%-75%,which has a wide limit.Moreover,leakage is prone to occur due to hydrogen embrittlement,causing serious accidents.In view of the leakage and diffusion accident that occurred after the hydrogen pipeline ruptured,a three-dimensional overhead pure hydrogen/hydrogen-doped pipeline leakage model was established,and the CFD software ANSYS-Fluent was used to perform leakage numerical simulation calculations to obtain the pure hydrogen/hydrogen-doped gas.Volume fraction and danger range,the influence of internal pressure,wind speed and hydrogen doping ratio on leakage diffusion was analyzed.The simulation results show that an increase in pipeline pressure leads to an increase in the dangerous area.An increase in wind speed hinders the upward diffusion of hydrogen,and at the same time shift hydrogen to the downwind direction,showing a trend of first increasing and then decreasing the leakage.The hydrogen doping ratio increases from 10%to 60%,the lower explosion limit of hydrogen-doped natural gas decreases by 0.54%,and the greater the hydrogen-doped ratio,the wider the spatial distribution and diffusion range of hydrogen-doped natural gas.
hydrogenleakage diffusionpipeline transportationnumerical simulationhydrogen doping ratio
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