| 摘要: |
| 目的 探究埋地掺氢天然气管道在土壤多孔介质影响下的气体泄漏扩散规律。方法 基于计算流体动力学（CFD）软件建立埋地掺氢天然气管道为研究对象的仿真模型，重点探究了土壤性质、覆土厚度、掺氢比、泄漏孔径、管道压力等因素对气体扩散过程的影响。结果 不同土壤性质对气体的扩散分布规律影响显著（纯砂土>纯壤土>纯黏土），气体在土壤中的扩散速度与土壤系数呈反比关系；覆土厚度与地表面形成危险区域的时间呈正相关关系，与地表面扩散面积呈负相关关系；集输过程中，掺氢比、泄漏孔径与压力的增加均导致形成的危险区域增大。结论 对比5种影响因素，土壤性质对掺氢天然气泄漏扩散的影响最大，应对砂土土壤下甲烷、氢气的扩散规律与危险区域予以重点关注。 |
| 关键词: 掺氢天然气 多孔介质 数值模拟 影响因素 危险区域 |
| DOI：10.3969/j.issn.1007-3426.2024.05.005 |
| 分类号: |
| 基金项目:国家自然科学基金“高含硫天然气集输管道中硫颗粒动态沉积行为预测模型研究”（52104063） |
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| Influence of soil properties on diffusion law of leaking hydrogen-blended natural gas from transmission pipeline |
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Gang LIU1, Xin WANG1, Duo CHEN1, Jingyi HUANG1, Jiuqing BAN2,3, Wei YANG2,3
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1.School of Safety Engineering, Chongqing University of Science and Technology, Chongqing, China;2.Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;3.Key Laboratory of Natural Gas Quality Control and Energy Measurement, State Administration for Market Regulation, Chengdu, Sichuan, China
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| Abstract: |
| Objective This study aims to explore the gas leakage and diffusion laws of buried hydrogen-doped natural gas pipelines under the influence of porous media. Methods A simulation model for buried hydrogen-blended natural gas pipelines was established based on computational fluid dynamics (CFD) software, focusing on exploring the effects of soil properties, soil thickness, hydrogen blending ratio, leakage aperture, and pipeline pressure on gas diffusion processes. Results Different soil properties significantly affect the gas diffusion distribution (pure sand > pure loam > pure clay), and the gas diffusion velocity in the soil is inversely proportional to the soil coefficient. The thickness of soil cover is positively correlated with the time of the formation of the dangerous zones on the ground surface and negatively correlated with the diffusion area on the ground surface. In gathering and transportation, the increase of hydrogen blending ratio, leakage aperture, and pressure all lead to the formation of dangerous zones. Conclusions Soil properties would impact hydrogen-blended natural gas leakage diffusion prominently. It is essential to focus on exploring the diffusion patterns and dangerous zones of methane and hydrogen in sand soils. |
| Key words: hydrogen-blended natural gas porous media numerical simulation influencing factors dangerous zone |
