In order to effectively reduce the fire safety accidents caused by the leakage of pure hydrogen pipeline,the diffusion law and distribution state of hydrogen were studied by numerical simulation method when the pure hydrogen pipeline leaks at different positions,and the accuracy of the simulation model was verified by combining relevant data of existing literatures.The simulation results show that the leakage of pure hydrogen pipeline will form a jet region with only a small amount of diffusion near the leakage hole.Due to the buoyancy of air,the distribution of hydrogen near the leakage hole is inverted cone when leaking under the pipeline,and the end of hydrogen cloud is obviously shifted upward when the pipeline leaks on the side.Under the conditions of 4 MPa pressure and 2 mm diameter of leakage hole,the optimal distance between the hydrogen sensor and the pipeline is 0.25 m.When the pipeline leaks above,below and sideways,the hydrogen concentration at 0.25 m in the leakage direction tends to be stable after 80 s,30 s and 60 s respectively.When monitoring the leakage of pure hydrogen pipeline,the optimal position of hydrogen sensor can be determined by numerical simulation analysis first,so as to improve its leakage monitoring range and prevent the occurrence of pipeline explosion accidents.
关键词
纯氢管道/消防安全/数值模拟/分布状态/泄漏监测
Key words
pure hydrogen pipeline/fire safety/numerical simulation/distribution state/leakage monitoring
维普
万方数据