非预混CO<sub>2</sub>喷射压力对掺氢天然气预混爆炸特性的影响

张玉春; 杨文; 张坤; 蒋保平; 阳旭峰

doi:10.11883/bzycj-2025-0048

非预混CO₂喷射压力对掺氢天然气预混爆炸特性的影响

doi: 10.11883/bzycj-2025-0048

西南交通大学地球科学与工程学院, 四川成都 611756

基金项目: 隧道氢能源列车燃爆机制与灾变行为研究（U24A20172）；国家自然科学基金（52278415, 52204241）

详细信息

作者简介:
张玉春（1980－　），男，博士，教授，zycfire@home.swjtu.edu.cn

通讯作者:
阳旭峰（1992－　），男，博士，副教授，xf_yang718@swjtu.edu.cn

中图分类号: O383
计量
- 文章访问数: 83
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- PDF下载量: 32
- 被引次数: 0
出版历程
- 收稿日期: 2025-02-19
- 修回日期: 2025-06-06
- 网络出版日期: 2025-06-06

Effects of non-premixed CO₂ injection pressure on the premixed explosion characteristics of hydrogen-doped natural gas

Faculty of Geosciences and Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China

摘要

摘要: 煤制氢是煤炭能源低碳转型的有效方案，针对煤制氢通入天然气管网大规模输送过程中安全问题，研究非预混CO₂喷射对掺氢天然气爆炸特性的影响。设计并搭建了爆炸实验平台，探究非预混CO₂的喷射压力（0～1.00 MPa）和喷射时间（0～180 ms，喷射早于点火开启的时间）对爆炸火焰传播行为和压力特性的影响规律。结果表明：非预混CO₂喷射显著影响甲烷/氢气/空气预混气爆炸行为。CO₂喷射会引起湍流效应导致火焰褶皱和结构改变，从而使火焰传播速度和爆炸压力增大。当喷射时间固定时（如0或120 ms），增加喷射压力会引入更多的CO₂，增强局部湍流和扰动，加剧火焰加速和爆炸后果。随着喷射时间增加，不同喷射压力下最大爆炸压力均呈先增后减的趋势。CO₂喷射对爆炸的湍流促进作用和稀释作用相互竞争，并存在临界喷射时间。过多的CO₂喷射时会增强它的稀释作用，削弱CO₂喷射对爆炸的湍流扰动能力，降低爆炸强度。此外，较大的喷射压力有着更小的临界喷射时间，同时较大喷射压力下的最大爆炸压力对喷射时间的变化有着更高的敏感性。
- 煤制氢 /
- 甲烷/氢气 /
- 预混爆炸 /
- CO₂喷射 /
- 喷射压力
Abstract: Coal-to-hydrogen is an effective solution for the low-carbon transformation of coal energy. To address the explosion safety issues during coal-to-hydrogen transportation via the natural gas pipeline network, the effect of non-premixed CO₂ injection on the explosion characteristics of hydrogen-doped natural gas was investigated. An experimental explosion platform was independently designed and constructed to actively release CO₂ into the hydrogen-doped methane explosion via a high-pressure gas injection device. The CO₂ injection was turned on earlier than ignition to create a non-premixed turbulent atmosphere. The volume of CO₂ injection was controlled by injection pressure (0, 0.5, 0.75, and 1.00 MPa) and injection time (0, 60, 120, and 180 ms). The explosion flame propagation dynamics and pressure behavior under non-premixed CO₂ injection were analyzed. Results showed that injection pressure and injection time significantly influence the premixed explosion process. The injection of non-premixed CO₂ into the premixed explosion induces turbulence, causing flame wrinkling. Structural changes in wrinkled flames increase the flame surface area, leading to accelerated flame propagation and enhanced explosion intensity. For a given injected time (e.g., 0 or 120 ms), increasing the injection pressure introduces more CO₂, which enhances localized turbulence and disturbance in the flame, leading to further flame acceleration and more severe explosion consequences. As the injection time increases, the maximum explosion pressure of different injection pressures increases and then decreases. CO₂ injection in the explosion plays a competitive relationship between turbulence promotion and dilution effect, and there is a critical injection time. Excessive CO₂ injection can enhance its dilution effect, weakening the CO₂ injection on the explosion of turbulence perturbation ability, which reduces the explosion intensity. Moreover, a larger injection pressure has a smaller critical injection time. Meanwhile, the maximum explosion pressure at larger injection pressures has a higher sensitivity to changes in injection time. Injection pressure and injection time are the key parameters of CO₂ injection affecting the explosion hazard of hydrogen-doped natural gas. The findings provide fundamental guidelines for the safety prevention and control strategy of hydrogen transportation in the natural gas pipeline network.
- coal-to-hydrogen /
- methane/hydrogen /
- premixed explosion /
- CO₂ injection /
- injection pressure

HTML全文

图 1 爆炸实验系统示意图

Figure 1. Schematic diagram of the explosion experimental system

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图 2 喷射时间为0 ms时火焰瞬态

Figure 2. Flame transient at injection duration is 0 ms

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图 3 喷射时间为120 ms时火焰瞬态

Figure 3. Flame transient at injection duration is 120 ms

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图 4 p_i=0 MPa时火焰前沿位置和火焰传播速度的耦合关系

Figure 4. Coupling of flame front position and flame propagation velocity for p_i=0 MPa

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图 5 p_i= 1.00 MPa时火焰前沿位置和火焰传播速度的耦合关系

Figure 5. Coupling of flame front position and flame propagation velocity for p_i=1.00 MPa

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图 6 火焰前沿位置随时间的变化关系

Figure 6. Variation of flame front position with time

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图 7 火焰传播速度随火焰前沿位置的变化关系

Figure 7. Variation of flame propagation velocity with flame front position

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图 8 爆炸压力变化曲线

Figure 8. Histories of explosion pressure

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图 9 不同CO₂喷射压力下的最大爆炸压力和喷射时间的关系

Figure 9. Relation between maximum explosion pressure and injection duration at different CO₂ injection pressures

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图 10 不同CO₂喷射压力下最大爆炸压力和最大火焰传播速度的关系

Figure 10. Relation between maximum explosion pressure and maximum flame propagation velocity at different CO2 injection pressures

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表 1 实验配置

Table 1. Experimental settings

Φ φ_H2/% 喷射位置/mm p_i/MPa 平均流量/(L·s⁻¹)

1.0 50 − 0（无喷射） −

250 0.50 1.33

0.75 2.00

1.00 3.33

下载: 导出CSV

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