Insight into the spontaneous combustion mechanism and characteristics of the hydrogen-blended natural gas during the leakage process: A numerical study

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-04-24 DOI:10.1016/j.ijhydene.2025.04.328

Wenlong Jia , Qiaojing Huang , Chuanxian Wen , Xia Wu

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引用次数: 0

Abstract

This paper uses Fluent software to develop a multi-field-coupled model for HBNG pipeline leakage. Flow characteristics, chemical reactions, and electrostatic interactions on the spontaneous combustion mechanism are investigated. The criterion is determined by temperature and OH⁻ mass fraction. Considering different conditions (hydrogen volume fraction 0–30 %, leakage pressure 4–10 MPa, leakage hole diameter 5–100 mm, pipe wall thickness 15–35 mm, static electricity intensity 0–0.5V), this paper studies 28 cases and explores the effects of diffusion ignition and electrostatic ignition mechanism on HBNG spontaneous combustion. Results show that: with the increasing of hydrogen volume fraction, leakage pressure, leakage hole diameter, and pipe wall thickness, the temperature, OH⁻ mass fraction and the possibility of self-ignition in the leakage process increase. The effect of electrostatic intensity on spontaneous combustion is relatively small. HBNG satisfies the spontaneous combustion criterion in the extreme spontaneous combustion condition. The maximum temperature and OH⁻ mass fraction respectively reach 1632.6 K and 6.15 × 10⁻⁴.

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氢混合天然气泄漏过程自燃机理及特性的数值研究

本文利用Fluent软件建立了HBNG管道泄漏多场耦合模型。研究了流动特性、化学反应和静电相互作用对自燃机理的影响。判据由温度和OH -质量分数决定。考虑不同条件（氢气体积分数0 ~ 30%，泄漏压力4 ~ 10 MPa，泄漏孔直径5 ~ 100 mm，管壁厚度15 ~ 35 mm，静电强度0 ~ 0.5 v），研究28例，探讨扩散点火和静电点火机理对HBNG自燃的影响。结果表明：随着氢气体积分数、泄漏压力、泄漏孔直径和管壁厚度的增加，泄漏过程中的温度、OH−质量分数和自燃可能性增加；静电强度对自燃的影响相对较小。HBNG在极端自燃条件下满足自燃准则。最高温度为1632.6 K， OH -质量分数为6.15 × 10 - 4。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.