氮气喷出对管道瓦斯爆炸的阻爆研究

路长; 张运鹏; 朱寒; 王鸿波; 路昊昕; 潘荣锟

doi:10.11883/bzycj-2019-0106

氮气喷出对管道瓦斯爆炸的阻爆研究

doi: 10.11883/bzycj-2019-0106

路长^{1, 2,},
张运鹏¹,
朱寒¹,
王鸿波¹,
路昊昕¹,
潘荣锟^{1, 2, ,}

1.
河南理工大学瓦斯地质与瓦斯治理国家重点实验室培育基地，河南焦作 454003
2.
河南理工大学煤炭安全生产与清洁高效利用省部共建协同创新中心，河南焦作 454003

基金项目: 国家自然科学基金（51674103，51774059，51974107）

详细信息

作者简介:
路　长（1975－　），男，博士，副教授，luch@hpu.edu.cn

通讯作者:
潘荣锟（1980－　），男，博士，副教授，prk2008@126.com

中图分类号: O389; TD71.2
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- 被引次数: 0
出版历程
- 收稿日期: 2019-04-03
- 修回日期: 2019-06-10
- 网络出版日期: 2020-03-25
- 刊出日期: 2020-04-01

The spurted nitrogen preventing the gas explosion in pipe

LU Chang^{1, 2
,},
ZHANG Yunpeng¹,
ZHU Han¹,
WANG Hongbo¹,
LU Haoxin¹,
PAN Rongkun^{1, 2
, ,}

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
State Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, Henan, China

摘要

摘要: 为探究喷出氮气对瓦斯爆炸火焰传播的抑制能力，设置三种氮气喷头布置方式来进行阻爆实验，采用的氮气喷出压力有0.1、0.2、0.3、0.4和0.5 MPa，爆炸开始后喷射氮气，爆炸结束后氮气立刻关闭。结果表明，单喷头距泄压口20 cm时，各压力下喷出的氮气都未能阻爆，但火焰在整个管道内的平均传播速度随氮气压力增大而减小；单喷头距泄压口35 cm时，喷气压力0.5 MPa下成功阻爆，其他喷气压力下未能阻爆；双喷头喷气时，喷气压力0.3、0.4、0.5 MPa情况下都能够阻爆，且喷气压力越大，火焰被阻止的位置越靠前。阻爆的实现，需要氮气在阻爆位置将管道截面上的预混气稀释到可燃极限以下，因而氮气量是影响稀释的重要参数。单喷头时，喷头距离泄压口远更易于实现阻爆。采用双喷头时，氮气区扩大，阻爆所需氮气压力、氮气总量比单喷头时都大为降低。
- 甲烷 /
- 阻爆 /
- 氮气 /
- 喷头布置 /
- 火焰
Abstract: After the gas explosion, preventing the propagation of explosion flame can better eliminate the disaster. In this paper, three kinds of nitrogen nozzle arrangement are set to carry out experiments for explosion prevention. The nitrogen pressures used in experiments include 0.1, 0.2, 0.3, 0.4 and 0.5 MPa, Nitrogen is spurted into the pipe after the occurrence of the explosion and immediately shut down after quenching the explosion. The results show that the spurted nitrogen under each pressure can not prevent the explosion with single nitrogen nozzle, which is 20 cm away from the vent. But the average propagation speed of the flame in the whole pipe decreases with the increase of nitrogen pressure. With single nitrogen nozzle, which is 35 cm away from the vent, the spurted nitrogen at pressure 0.5 MPa succeed in explosion prevention, while the explosion can not be prevented at other pressure. When double nozzle is used to spurt nitrogen, the explosion is prevented in the case of pressure 0.3, 0.4 and 0.5 MPa. And the greater the nitrogen pressure, the more forward the flame is blocked. The explosion prevention requires nitrogen to dilute the premixed gas below the combustible limit. Nitrogen volume is the important parameter affecting dilution. With single nitrogen nozzle, the situation of nozzle far from the vent is easier to prevent the explosion than that of nozzle near from the vent. When double nozzles are used, the nitrogen region will enlarge. With double nozzle, lower nitrogen pressure and less nitrogen quantity are required for preventing the explosion as comparing with single nozzle.
- methane /
- preventing explosion /
- nitrogen /
- nozzle arrangement /
- flame

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图 1 实验系统示意图

Figure 1. Schematic diagram of experimenal system

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图 2 单喷头距泄压口20 cm、喷气压力为0.5 MPa下的爆炸火焰

Figure 2. Explosion flame while single nozzle 20 cm away from the vent and spurting pressure of 0.5 MPa

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图 3 喷头距泄压口35 cm时的爆炸火焰图像

Figure 3. Explosion flame while single nozzle 35 cm away from the vent

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图 4 双喷头下的爆炸火焰图像

Figure 4. Explosion flame images with double nozzle

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图 5 0.5 MPa下喷头不同布置的爆炸超压

Figure 5. Explosion overpressure at 0.5 MPa with different nozzle arrangement

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表 1 单喷头距泄压口20 cm的爆炸传播特征表

Table 1. Spread characteristics of the flame while single nozzle 20 cm away from the vent

序号	p/MPa	t₁/ms	t₂/ms	t₃/ms	V/L	火焰阻隔状况
1	0	−	184	356	0	未阻爆
2	0.1	65	162	179	0.203	未阻爆
3	0.2	68	163	186	0.350	未阻爆
4	0.3	63	169	192	0.547	未阻爆
5	0.4	66	166	200	0.712	未阻爆
6	0.5	68	162	201	0.854	未阻爆
注：p为喷气压力，t₁为喷气时刻，t₂为火焰到达泄压口的时刻，t₃为火焰到达喷头的时刻，V为火焰到达喷头前氮气的喷出量。

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表 2 单喷头距泄压口35 cm的爆炸传播特征表

Table 2. Spread characteristics of the flame while single nozzle 35 cm away from the vent

序号	p/MPa	t₁/ms	t₂/ms	t₃/ms	V/L	火焰阻隔状况
1	0	−	184	496	0	未阻爆
2	0.1	62	170	382	0.570	未阻爆
3	0.2	65	171	394	0.977	未阻爆
4	0.3	72	172	405	1.412	未阻爆
5	0.4	61	182	419	1.901	未阻爆
6	0.5	73	184	397	2.080	阻爆于喷头处

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表 3 双喷头下的爆炸传播特征表

Table 3. The characteristics of explosion spread when double nozzle used

序号	p/MPa	t₁/ms	t₂/ms	t_3R/ms	t_3L/ms	V_R/L	V_L/L	火焰阻隔状况
1	0	−	184	356	496	0	0	未阻爆
2	0.1	59	145	253	355	0.691	1.054	未阻爆
3	0.2	62	150	258	376	1.164	1.865	未阻爆
4	0.3	70	167	267	−	1.671	−	阻爆于右喷头
5	0.4	67	175	274	−	2.198	−	阻爆于右喷头
6	0.5	65	158	（239）−	−	（2.234）−	−	阻爆于泄压口与喷头间
注：（1）t_3R和t_3L分别为火焰到达右喷头和做喷头的时刻；V_R和V_L分别为火焰到达右喷头和左喷头时，双喷头的总喷气量；（2）表中“−”代表火焰没有到达，无数据；（3）“（239）−”表示火焰到达左侧最远位置对应的该项数值是239。

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