Simulation Study on the Influence of Hydrogen Blending Ratio on Natural Gas Pipeline Leakage and Diffusion

doi:10.12422/j.issn.1672-6952.2024.04.006

Abstract

Abstract:

To study the influence of hydrogen mixing ratio on the leakage of natural gas pipelines, a mathematical model for the leakage and diffusion of directly buried high?pressure hydrogen mixed natural gas pipelines was established based on computational fluid dynamics theory and numerical simulation method.The leakage status, volume fraction distribution of hydrogen mixed gas,and the distribution of soil pressure and gas velocity around the pipeline were analyzed under different hydrogen mixing ratios.The results show that with the increase of hydrogen mixing ratio, the explosion radius of hydrogen mixed gas in the atmosphere will gradually decrease,and the range of high?pressure area around the pipeline will gradually decrease,and the gas flow rate at the leakage port will gradually increase.When the hydrogen mixing ratio is 30%,the explosion radius in the atmosphere is reduced by 43%,and the gas flow rate at the leakage port is increased by 68%.This provides a theoretical reference for the safety and emergency repair of hydrogen?doped natural gas pipelines and has important practical significance for promoting the large?scale application of hydrogen?doped natural gas.

Key words: Hydrogen?mixed natural gas, Leakage, Diffusion, Numerical simulation, Safety

摘要：

为了研究掺氢比对天然气管道泄漏的影响，基于计算流体力学理论，采用数值模拟方法，建立了直埋高压掺氢天然气管道泄漏扩散的数学模型，分析了掺氢比不同时掺氢天然气的泄漏状况、体积分数分布状况，以及管道周围土壤压力与气体泄漏速度的分布情况。结果表明，随着掺氢比的增加，大气中掺氢天然气的爆炸半径逐渐减小，管道周围高压区域范围逐渐减小，而泄漏口处的气体泄漏速度逐渐增大；当掺氢比为30%（体积分数）时，大气中的爆炸半径相较于纯天然气的爆炸半径减小了43%，泄漏口处气体泄漏速度增大68%。研究结果可为掺氢天然气管道的安全抢修提供理论参考依据，对推动掺氢天然气的大规模应用具有重要的实际意义。

关键词: 掺氢天然气, 泄漏, 扩散, 数值模拟, 安全

CLC Number:

TE832

Zhunshun ZHANG, Zhen PAN, Ruixin BAO, Yang LI, Guiyang MA. Simulation Study on the Influence of Hydrogen Blending Ratio on Natural Gas Pipeline Leakage and Diffusion[J]. Journal of Liaoning Petrochemical University, 2024, 44(4): 44-50.

张准顺, 潘振, 包瑞新, 李洋, 马贵阳. 掺氢比对天然气管道泄漏扩散影响的模拟研究[J]. 辽宁石油化工大学学报, 2024, 44(4): 44-50.

Figures/Tables 11

Fig.1 Schematic diagram of hydrogen doped natural gas pipeline leakage model

Fig.2 Schematic diagram of hydrogen doped natural gas pipeline leakage grid

Table 1 Grid independence verification results

网格数	泄漏口流量/（kg $⋅$ s^-1）	误差/%
41 206	0.884 2	11.10
101 957	0.929 2	6.52
149 477	0.981 5	1.29
245 266	0.993 6	0.07
355 953	0.994 3	0（基准）

Table 1 Grid independence verification results

网格数	泄漏口流量/（kg $⋅$ s^-1）	误差/%
41 206	0.884 2	11.10
101 957	0.929 2	6.52
149 477	0.981 5	1.29
245 266	0.993 6	0.07
355 953	0.994 3	0（基准）

Fig.3 Model validation result

Fig.5 Volume fraction distribution map of hydrogen doped natural gas

Fig.6 The variation curve of flow rate and mass flow rate at pipeline leakage port with different hydrogen blending ratios

Fig.7 The variation curve of the environmental pressure at the leakage port of the pipeline with different hydrogen blending ratios

Fig.8 The cloud map of soil pressure distribution under different hydrogen doping ratios in steady state

Fig.9 The cloud map of flow rate distribution under different hydrogen doping ratios in steady state

Fig.10 The change curve of explosion limit of hydrogen?doped natural gas with the hydrogen?doped ratio

Fig.11 The change curve of explosion radius of hydrogen?doped natural gas with the hydrogen?doped ratio

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