掺氢天然气管道泄漏扩散规律及监测探头布设方案

1.中国石油天然气销售公司;2.中国石油大学（北京）安全与海洋工程学院;3.中国石油大学（北京）管道技术与安全研究中心

1.PetroChina Marketing Company;2.College of Safety and Ocean Engineering, China University of Petroleum (Beijing);3.Pipeline Technology and Safety Research Center, China University of Petroleum (Beijing)

为探究掺氢导致的天然气泄漏行为变化，实现掺氢混合气体泄漏的快速检测，采用Fluent软件建立特定半封闭场所的平面泄漏模型，研究掺氢天然气在不同风速下的扩散情况及不同掺氢体积分数下的动态发展规律。结果表明：风速增大会阻碍掺氢天然气向上扩散，同时加速气体在水平方向的积累，而掺氢体积分数增大会使气体扩散高度降低，且使扩散高度增速减缓。根据相关标准和不同掺氢体积分数天然气扩散达到其爆炸下限所在高度的仿真结果，提出掺氢天然气管道在半封闭空间场景下的可燃气体监测探头布设方案，以确保泄漏发生后能够及时作出应急响应，保障管道安全运行。（图8，参26）

In order to study the change of gas leakage behavior caused by hydrogen mixing and rapidly realize the leakage detection of hydrogen-mixed gas, a plane leakage model for specific semi-closed places was established with the Fluent software, and thereby, the diffusion of hydrogen-mixed natural gas at different wind speeds and the dynamic development law at different volume fraction of mixed hydrogen were explored. The research results show that: the increase of wind speed will prevent the hydrogen-mixed natural gas from upward diffusion and accelerate the gas accumulation in the horizontal direction, while the increasing volume fraction of mixed hydrogen will reduce the gas diffusion height and slow down the growth of diffusion height. According to the relevant standards and the simulation results of height at which natural gas with different volume fractions of mixed hydrogen diffuses to its lower limit of explosion, the layout plan of flammable gas detectors of hydrogen-mixed natural gas pipeline in the semi-closed space scenario was proposed to ensure that emergent response could be provided immediately after leakage, thus assuring the safe operation of pipelines. (8 Figures, 26 References)