外加磁场对乙炔气体爆炸反应影响研究

高建村; 杨喜港; 胡守涛; 洪子金; 王乐; 李如霞; 夏艺萌; 孙谞

doi:10.11883/bzycj-2021-0417

外加磁场对乙炔气体爆炸反应影响研究

doi: 10.11883/bzycj-2021-0417

高建村^{1, 2,},
杨喜港¹,
胡守涛^{1, 2, ,},
洪子金¹,
王乐³,
李如霞¹,
夏艺萌¹,
孙谞²

1.
北京石油化工学院安全工程学院，北京 102617
2.
北京市安全生产工程技术研究院，北京 102617
3.
北京旭阳科技有限公司，北京 100067

基金项目: 北京市教委科技计划项目（KM201910017001）；北京市自然科学基金青年项目（2214071）

详细信息

作者简介:
高建村（1964－　），男，博士，教授，gaojiancun@bipt.edu.cn

通讯作者:
胡守涛（1986－　），男，博士，讲师，hushoutao@bipt.edu.cn

中图分类号: O389
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- 文章访问数: 493
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- PDF下载量: 53
- 被引次数: 0
出版历程
- 收稿日期: 2021-10-08
- 修回日期: 2022-02-12
- 网络出版日期: 2022-03-29
- 刊出日期: 2022-07-25

Effect of external magnetic field on explosion reaction of acetylene gas

GAO Jiancun^{1, 2
,},
YANG Xigang¹,
HU Shoutao^{1, 2
, ,},
HONG Zijin¹,
WANG Le³,
LI Ruxia¹,
XIA Yimeng¹,
SUN Xu²

1.
School of Safety Engineering, Beijing Institute of Petrochemical Technology, Bejing 102617, China
2.
Beijing Academy of Safety Engineering and Technology, Beijing 102617, China
3.
Bejing Xuyang Chemical Technology Institute Co. Ltd, Beijing 100067, China

摘要

摘要: 为探究磁场对气体爆炸反应的影响，实验研究了磁场强度对C₂H₂爆炸特征的影响规律，结果表明：磁场能抑制C₂H₂爆炸压力和升压速率，磁场强度越大，抑制效果越明显；沿火焰传播方向，磁场对C₂H₂爆炸火焰传播速度呈现先促进后抑制的效果，整体表现为抑制作用。磁场强度较低时，爆炸火焰平均传播速度降低了38.94%，磁场强度较高时，爆炸火焰平均传播速度降低了49.62%。利用Chemkin-Pro软件模拟了C₂H₂爆炸基元反应过程，理论推导了磁场影响C₂H₂爆炸的反应机理，磁场改变了C₂H₂爆炸反应路径，是造成爆炸特征参数下降的主要原因。由于不同种类自由基的摩尔质量和磁化强度不同，在磁场中，洛伦兹力和梯度磁场力对小分子量自由基比对大分子量自由基的作用力更大。磁场改变了自由基的运动轨迹，由于同种小分子量自由基的聚集和器壁效应的产生，减小了关键自由基之间的碰撞几率，降低了基元反应的速率，导致爆炸强度下降。
- 电磁场 /
- 火焰传播速度 /
- 反应路径 /
- 自由基 /
- 基元反应
Abstract: To study the effects of magnetic fields on the gas explosion, considering equivalent acetylene premixed combustible gas as the research object, the effects of different magnetic field intensities on acetylene explosion characteristics were studied experimentally. The explosion pressure and flame propagation velocity were measured simultaneously by transient pressure sensors and a detonation velocity instrument, respectively. The results show that the magnetic fields reduce the explosion pressure and the pressure rise rate of acetylene. With increasing magnetic field intensity, the suppression effect is more significant. Along the direction of flame propagation, the magnetic fields first promote and then suppress the explosion flame propagation velocity of acetylene, and the inhibition effect is stronger than the promotion effect. In these experimental conditions, the average propagation velocity of the explosion flame decreased by 38.94% under lower magnetic fields intensity, and at higher magnetic fields intensity, it decreased by 49.62%. To further study the impact mechanism of magnetic fields on premixed combustible gas explosion, the acetylene explosion free radicals reaction process was simulated numerically by Chemkin-Pro software. The chain reactions, rate of products, and sensitivity are analyzed. And the key radical and reaction paths of acetylene explosion are obtained. Combined with the force analysis of magnetic fields on free radicals, it is deduced that magnetic fields change the reaction paths of acetylene to produce carbon dioxide and water, which is the main internal reason for the decrease in explosion parameters. The different free radicals have different molar masses and magnetization. Lorentz force and gradient magnetic field force have stronger effects on small molecular weight free radicals than on large molecular weight free radicals. The calculation shows that the magnetic fields change the trajectory of the free radicals, cause the aggregation of free radicals with the same small molecular weight, and produce a wall effect, which reduces collisions between key free radicals and the rate of elementary reactions, resulting in a decrease of explosion intensity.
- electromagnetic fields /
- flame propagation velocity /
- reaction paths /
- free radicals /
- elementary reactions

HTML全文

图 1 电磁场下预混气体爆炸实验装置示意图

Figure 1. Schematic of gas explosion experiment device under electromagnetic field

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图 2 不同磁场强度下乙炔/空气的爆炸压力

Figure 2. Explosion pressures of C₂H₂/air under different magnetic fields strengths

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图 3 平均压力上升速率和最大压力对比图

Figure 3. Average pressure rise rate and maximum explosion pressure

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图 4 乙炔/空气爆炸火焰传播速度和平均传播速度

Figure 4. Flame propagation velocity and average propagation velocityof C₂H₂/air explosion

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图 5 C₂H₂的生成速率分析

Figure 5. Rate of product analysis of C₂H₂

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图 6 C₂H₂的敏感性分析

Figure 6. Sensitivity analysis of C₂H₂

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图 7 有无磁场时C₂H₂生成CO的反应路径变化

Figure 7. Changes in reaction pathto produce CO from C₂H₂ due to magnetic field

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图 8 有无磁场时C₂H₂生成H₂O的反应路径变化

Figure 8. Changes inreaction path to produce H₂O from C₂H₂ due to magnetic field

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表 1 无磁场时乙炔/空气的爆炸火焰传播速度

Table 1. Flame propagation velocity of C₂H₂/air explosion without a magnetic field

实验	光纤传感器	距离/mm	时间/μs	速度/(m·s⁻¹)	平均速度/(m·s⁻¹)
1	1～2	300	9945.93	30.16	81.64
1	2～3	300	2253.58	133.12	81.64
2	1～2	300	9893.27	30.32	80.97
2	2～3	300	2279.23	131.62	80.97
3	1～2	300	9369.14	32.02	98.51
3	2～3	300	1818.18	165.00	98.51

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表 2 较低磁场强度下乙炔/空气的爆炸火焰传播速度

Table 2. Flame propagation velocity of C₂H₂/air explosion under lower magnetic field strength

实验	光纤传感器	距离/mm	时间/μs	速度/(m·s⁻¹)	平均速度/(m·s⁻¹)
1	1～2	300	7955.45	37.71	53.02
1	2～3	300	4390.46	68.33	53.02
2	1～2	300	7874.02	38.10	52.80
2	2～3	300	4444.26	67.50	52.80
3	1～2	300	8002.13	37.49	53.64
3	2～3	300	4298.61	69.79	53.64

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表 3 较高磁场强度下乙炔/空气的爆炸火焰传播速度

Table 3. Flame propagation velocity of C₂H₂/air explosion under higher magnetic field strength

实验	光纤传感器	距离/mm	时间/μs	速度/(m·s⁻¹)	平均速度/(m·s⁻¹)
1	1～2	300	4917.23	61.01	41.81
1	2～3	300	13269.07	22.61	41.81
2	1～2	300	4705.88	63.75	43.88
2	2～3	300	12494.15	24.01	43.88
3	1～2	300	4558.58	65.81	45.86
3	2～3	300	11577.70	25.91	45.86

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表 4 起始参数

Table 4. Initial parameters

C₂H₂体积分数/%	N₂体积分数/%	O₂体积分数/%	温度/K	压力/kPa	时间/s
7.7	72.917	19.383	1200	101	0.05

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