煤气与热力2025，Vol.45Issue(6)：68-75,8.
埋地掺氢天然气管道泄漏扩散特性研究
Research on Leakage and Diffusion Characteris-tics of Buried Hydrogen-blended Natural Gas Pipelines
赵伟 1邓渤凡 2任益群 3邵永前 3黄小美 2魏大强 2黄硕鑫1
作者信息
- 1. 中国市政工程华北设计研究总院有限公司第十设计研究院,天津 300074
- 2. 重庆大学土木工程学院,重庆 400045
- 3. 西安秦华燃气集团有限公司,陕西西安 710075
- 折叠
摘要
Abstract
The leakage and diffusion characteristics of buried hydrogen-blended natural gas pipelines are ana-lyzed using ANSYS Fluent software.A pipeline soil leakage model is established to analyze the leakage and diffusion characteristics under the influence of dif-ferent factors,including leakage duration,hydrogen-blending ratio,leakage pressure,leakage orifice diam-eter,and surface conditions.The leakage and diffusion process of hydrogen-blended natural gas in soil is ana-lyzed through two hazard range indicators:the farthest danger range(FDR)where the gas with a volume frac-tion higher than the lower explosive limit diffuses along the pipeline,and the ground danger range(GDR)where the gas with a volume fraction higher than the lower explosive limit diffuses on the ground surface.Both FDR and GDR increase rapidly within the first 600 seconds and then their growth rates decline.When the hydrogen blending ratio is 20％,the FDR and GDR of hydrogen-blended natural gas are basically equal to those of pure methane during leakage.When the hydro-gen blending ratio reaches 50％,its influence on the diffusion range of the leaked gas in soil can no longer be ignored.The diffusion range of hydrogen-blended natural gas expands with increasing leakage pressure.Moreover,as the leakage pressure rises,its impact on the gas diffusion becomes more pronounced at the ground surface than within the soil.The larger the leak-age orifice diameter,the greater the FDR and GDR of the hydrogen-blended natural gas diffusion.Addition-ally,as the leakage orifice diameter increases,its im-pact on the diffusion range becomes more pronounced.As the leakage duration increases,surface hardening causes more leaked gas to diffuse laterally rather than upward.Surface hardening leads to a larger GDR,mak-ing the hazard level higher than that under non-hard-ened surfaces.关键词
掺氢天然气管道/土壤/泄漏扩散/数值模拟Key words
hydrogen-blended natural gas/soil/leakage and diffusion/numerical simulation分类
土木建筑引用本文复制引用
赵伟,邓渤凡,任益群,邵永前,黄小美,魏大强,黄硕鑫..埋地掺氢天然气管道泄漏扩散特性研究[J].煤气与热力,2025,45(6):68-75,8.
