掺氢天然气站场泄漏后果演化及评价研究

Evolution and Evaluation of Leakage Consequences in Hydrogen Blended Natural Gas Stations

利用天然气管道系统混输氢气是一种高效、经济的输送方式,研究掺氢天然气站场泄漏后果演化及定量风险对保障掺氢管网安全运行有重要意义。建立了掺氢天然气站场模型,运用FLACS(一种基于计算流体力学的火灾与爆炸仿真软件)模拟了不同场景下掺氢天然气泄漏扩散后果的演化过程,分析了掺氢比、泄漏孔径、泄漏压力及泄漏温度等因素的影响。研究发现:在高风速条件下,增大掺氢比,泄漏扩散危险范围和火灾热辐射危险半径减小;较大的泄漏孔径导致泄漏危险性显著增加;泄漏压力和泄漏温度对泄漏扩散后果影响不大。基于模拟后果,对掺氢天然气站场进行了喷射火定量风险评价,发现喷射火定量风险值随掺氢比的增加而降低。研究结果可为掺氢天然气站场的建设与安全维护提供参考。

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.