碳酸氢钠粉体对导管泄爆过程的影响

余明高; 付元鹏; 郑立刚; 王玺; 杨文; 靳红旺

doi:10.11883/bzycj-2020-0437

碳酸氢钠粉体对导管泄爆过程的影响

doi: 10.11883/bzycj-2020-0437

余明高^{1, 2,},
付元鹏¹,
郑立刚^{1, 3, ,},
王玺¹,
杨文¹,
靳红旺¹

1.
河南理工大学安全科学与工程学院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.
重庆大学煤炭灾害动力学与控制国家重点实验室，重庆 400044
3.
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: 国家重点研发计划（2018YFC0808100）；国家自然科学基金（51674104，51874120）

详细信息

作者简介:
余明高（1963－　），男，博士，教授，mg_yu@126.com

通讯作者:
郑立刚（1979－　），男，博士，教授，zhengligang97@163.com

中图分类号: O389
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- 文章访问数: 502
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- 被引次数: 0
出版历程
- 收稿日期: 2020-11-24
- 修回日期: 2020-12-25
- 网络出版日期: 2021-08-30
- 刊出日期: 2021-09-14

Effect of sodium bicarbonate powder on the process of ducted venting

YU Minggao^{1, 2
,},
FU Yuanpeng¹,
ZHENG Ligang^{1, 3
, ,},
WANG Xi¹,
YANG Wen¹,
JIN Hongwang¹

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
State Key Laboratory of Coal Mine Disaster Dynamics Control, Chongqing University, Chongqing 400044, China
3.
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, Henan, China

摘要

摘要:
为了研究惰性粉体对导管泄爆过程的影响，采用质量浓度C为0、40、80、120、160、200 、240 g/m³的碳酸氢钠（NaHCO₃）粉体，分别抑制连接不同长度（250 mm、500 mm、750 mm）泄爆导管的5 L容器内甲烷/空气预混气爆炸。对火焰传播特性分析结果表明：容器内添加NaHCO₃粉体可以极大地削弱导管内二次爆炸，且合适质量浓度的NaHCO₃粉体可以消除二次爆炸。随着NaHCO₃粉体质量浓度增加，容器内火焰结构逐渐不规则化，火焰到达容器末端时间延长，导管内火焰经历弱化到熄灭过程，不同质量浓度NaHCO₃粉体导致3种火焰速度发展模式。对压力特性分析得知，导管内爆炸超压上升机理依赖于NaHCO₃粉体质量浓度，粉体质量浓度较低时，容器中最大爆炸超压取决于二次爆炸产生的第二压力峰值，反之取决于火焰在容器触壁时产生的第一压力峰值。随着NaHCO₃粉体质量浓度增加，超压峰值下降率先增加然后趋于稳定，表明质量浓度效应逐渐减弱。最后定量分析了导管-容器配置中火焰传播速度与爆炸超压的关系。
- 甲烷爆炸 /
- 导管泄爆 /
- 抑爆 /
- 粉体质量浓度
Abstract:
To investigate the effect of sodium bicarbonate on the process of ducted venting, an experimental study was performed to suppress the methane-air explosions in a 5 L vessel connected with different duct length (250, 500, 750 mm) under NaHCO₃ dry powder with the mass concentration C=0, 40, 80, 120, 160, 200, 240 g/m³. The flame front propagation and explosion overpressure waveform were analyzed. The results show that NaHCO₃ powder greatly weakened the secondary explosion in the discharge duct, and the appropriate mass concentration of NaHCO₃ powder eliminated the secondary explosion. As the NaHCO₃ powder mass concentration increased, the flame structure in the vessel was gradually irregular, and the flame in the discharge duct went through the process of weakening to extinguishing. Moreover, the time for the flame to reach the end of the vessel was prolonged with the increase of powder mass concentration. Different mass concentration of NaHCO₃ dry powder led to three development modes of flame velocity. The mechanism for the pressure rise in the vessel depended on the NaHCO₃ powder mass concentration. The maximum pressure in the vessel was mainly dominated by the second pressure peak for the low powder mass concentration, but by the first pressure peak for the high powder mass concentration. The drop rate of overpressure increased at first and then leveled off with the increase of NaHCO₃ powder mass concentration, which indicates that the mass concentration effect gradually weaken. Finally, the relationship between flame propagation velocity and explosion overpressure in the ducted vented vessel was quantitatively analyzed.
- methane explosion /
- ducted venting /
- explosion suppression /
- powder mass concentration

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图 1 实验系统示意图

Figure 1. Schematic diagram of experimental system

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图 2 NaHCO₃粉体的粒度分布

Figure 2. Particle size distribution of NaHCO₃ powder

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图 3 NaHCO₃粉体的扫描电镜图

Figure 3. Scanning electron microscope of the NaHCO₃ powder

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图 4 火焰锋面结构演化图

Figure 4. Evolution diagram of flame front structure

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图 5 火焰传播速度随位置变化关系

Figure 5. Flame propagation velocity changed with flame front position

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图 6 导管内最大火焰传播速度随NaHCO₃质量浓度变化趋势

Figure 6. Maximum flame propagation velocity in the duct changed with NaHCO₃ powder mass concentration

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图 7 火焰前锋到达容器末端时间与容器内平均火焰速度

Figure 7. Arrival time of flame front and average flame velocity in the vessel

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图 8 40和200 g/m³ NaHCO₃作用下容器内超压变化历程

Figure 8. Pressure history in the vessel with 40 and 200 g/m³ NaHCO₃

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图 9 容器内两压力峰值随粉体质量浓度的变化

Figure 9. Variation of two pressure peaks in the vessel with NaHCO₃ mass concentration

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图 10 容器内最大超压峰值及下降率曲线

Figure 10. Dependence of maximum overpressure and its drop rate in the vessel on NaHCO₃ powder mass concentration

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图 11 导管内最大超压与容器内平均火焰传播速度的关系

Figure 11. Maximum pressure in the duct p_d,max vs average flame velocity in the vessel u_f

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图 12 容器内最大爆炸超压与导管内最大爆炸超压的关系

Figure 12. Maximum pressure in the vessel p_v,max vs maximum pressure in the duct p_d,max

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