掺氢比和CO<sub>2</sub>对掺氢天然气爆炸特性的影响

罗振敏; 南凡; 孙亚利; 程方明; 苏彬; 李睿康; 王涛

doi:10.11883/bzycj-2024-0282

掺氢比和CO₂对掺氢天然气爆炸特性的影响

doi: 10.11883/bzycj-2024-0282

罗振敏^{1, 2,},
南凡^{1, 2, ,},
孙亚利^{1, 3},
程方明^{1, 2},
苏彬^{1, 2},
李睿康^{1, 2},
王涛^{1, 2}

1.
西安科技大学安全科学与工程学院，陕西西安 710054
2.
西安市城市公共安全与消防救援重点实验室，陕西西安 710054
3.
中国安全生产科学研究院

基金项目: 西安科技大学优秀博士学位论文培育计划项目；陕西省教育厅基金项目（23JP092）；国家自然科学基金（52174200）

详细信息

作者简介:
罗振敏（1976－　），女，博士，教授，zmluo@xust,edu.cn

通讯作者:
南　凡（1993－　），男，博士研究生，1538478605@qq.com

中图分类号: X932
计量
- 文章访问数: 240
- HTML全文浏览量: 17
- PDF下载量: 24
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-11
- 修回日期: 2024-12-29
- 网络出版日期: 2025-01-01

Effects of hydrogen ratio and CO₂ on the explosion characteristics of hydrogen-doped natural gas

LUO Zhenmin^{1, 2
,},
NAN Fan^{1, 2
, ,},
SUN Yali^{1, 3},
CHENG Fangming^{1, 2},
SU Bin^{1, 2},
LI Ruikang^{1, 2},
WANG Tao^{1, 2}

1.
School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
2.
Xi’an Key Laboratory of Urban Public Safety and Fire Rescue, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
3.
China Academy of Safety Science and Technology

摘要

摘要: 天然气掺氢技术已被逐渐运用于管道运输，但掺氢天然气易发生泄漏爆炸事故。文中采用20 L球形装置研究了掺氢比和添加CO₂对掺氢天然气爆炸压力和火焰传播特性的影响。结果表明：掺氢比对掺氢天然气爆炸压力和火焰传播速度有促进作用。随着掺氢比增加，最大爆炸压力逐渐上升，快速燃爆时间和持续燃烧时间减小，最大爆炸压力上升速率和火焰传播速度在掺氢比小于0.5时逐渐上升，当掺氢比大于0.5时，最大爆炸压力上升速率和火焰传播速度快速上升。加入CO₂对混合气体爆炸压力和火焰传播速度有抑制作用，但对高掺氢比的压力参数抑制效果较差。通过反应动力学分析可知，随着掺氢比增大，火焰层流燃烧速度和绝热火焰温度逐渐上升，活性自由基摩尔分数和产物生成速率明显上升，并且掺混氢气改变了甲烷的反应路径，当掺氢比大于0.5，反应R84、R46和R3进入了前十步反应中，产生了H和OH自由基，促进了反应。而CO₂能降低混合气体的层流燃烧速率、绝热火焰温度、活性自由基摩尔分数以及产物生成速率，但添加CO₂不改变甲烷的反应路径。
- 气体爆炸 /
- 掺氢比 /
- 爆炸抑制 /
- 动力学分析
Abstract: Hydrogen-doped natural gas technology has been gradually used in pipeline transportation, but hydrogen-doped natural gas is prone to leakage and explosion accidents. The study used a 20L spherical device to investigate the effects of hydrogen blending ratio and CO₂ addition on the explosion pressure and flame propagation characteristics of hydrogen-doped natural gas, and the chemical reaction kinetics method was used to analyse the explosion mechanism. The results showed that the hydrogen doping ratio has a promoting effect on the hydrogen-doped natural gas explosion pressure parameters and flame propagation speed. As the hydrogen doping ratio increases, the maximum explosion pressure gradually increases, the rapid burn time and sustained burn time are gradually decreasing. The maximum explosion pressure rise rate and flame propagation speed gradually increase when the hydrogen doping ratio is less than 0.5. When the hydrogen doping ratio is greater than 0.5, the maximum explosion pressure rise rate and flame propagation speed rise rapidly. The addition of CO₂ has an inhibitory effect on the explosion pressure and flame propagation speed of the mixed gas, but the suppression effect on pressure parameters with high hydrogen doping ratio is poor. Through reaction kinetic analysis, it can be seen that as the hydrogen doping ratio increases, the laminar burning velocity and adiabatic flame temperature gradually increase, the mole fraction of active free radicals and the rate of product increase significantly, and the mixing of hydrogen changes the reaction path of methane. When the hydrogen doping ratio is greater than 0.5, reactions R84, R46 and R3 enter the top ten steps of the reaction, producing H and OH radicals, which promotes the reaction. CO₂ can reduce the laminar burning velocity, adiabatic flame temperature, active free radical mole fraction and rate of production of the mixed gas, but adding CO₂ does not change the reaction path of methane.
- gas explosion /
- hydrogen doping ratio /
- explosion suppression /
- kinetic analysis

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图 1 实验装置示意图

Figure 1. Schematic of experimental device

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图 2 爆燃效应表征参数提取

Figure 2. Extraction of characteristic parameters of deflagration

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图 3 掺氢比和CO₂对氢气/甲烷爆炸压力参数的影响

Figure 3. Effects of hydrogen doping ratio and CO₂ on hydrogen/methane explosion pressure parameters

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图 4 掺氢比对氢气/甲烷爆炸火焰传播过程的影响

Figure 4. Effect of hydrogen doping ratio on hydrogen/methane explosion flame propagation process

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图 5 CO₂对氢气/甲烷爆炸火焰传播过程的影响（X=0.5）

Figure 5. Effect of CO₂ on the explosion flame propagation process of hydrogen/methane（X=0.5）

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图 6 掺氢比和CO₂对氢气/甲烷火焰传播速度的影响

Figure 6. Effects of hydrogen ratio and CO₂ on hydrogen/methane flame propagation speed

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图 7 掺氢比和CO₂对氢气/甲烷球形火焰层流燃烧速度的影响

Figure 7. Effects of hydrogen ratio and CO₂ on laminar burning velocity of hydrogen/methane spherical flame

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图 8 掺氢比和CO₂对氢气/甲烷绝热火焰温度的影响

Figure 8. Effects of hydrogen ratio and CO₂ on hydrogen/methane adiabatic flame temperature

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图 9 掺氢比和CO₂对H、O和OH自由基摩尔分数的影响

Figure 9. Effects of hydrogen ratio and CO₂ on the mole fraction of H, O and OH free radicals

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图 10 层流燃烧速度与H自由基摩尔分数的关系

Figure 10. The relationship between laminar burning velocity and H radical mole fraction

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图 11 氢气/甲烷爆炸H自由基的生成速率（XH₂=0.5）

Figure 11. Production rate of H radical in hydrogen/methane explosion (XH₂=0.5)

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图 12 氢气/甲烷火焰层流燃烧速度敏感性分析

Figure 12. Sensitivity analysis of laminar burning velocity in hydrogen/methane flame

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表 1 掺氢比以及氢气和甲烷的体积分数

Table 1. Hydrogen doping ratio and volume fractions of hydrogen and methane

掺氢比X H₂体积分数/% CH₄体积分数/%

0 0 9.50
0.1 1.02 9.18
0.3 3.36 8.36
0.5 7.19 7.19
0.7 12.67 5.43
0.9 21.98 2.44
1 29.59 0

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