NaHCO3抑制瓦斯爆炸火焰与压力的耦合分析

doi:10.11949/j.issn.0438-1157.20180433

化工学报 ›› 2018, Vol. 69 ›› Issue (9): 4129-4136.DOI: 10.11949/j.issn.0438-1157.20180433

• 过程安全 • 上一篇

NaHCO₃抑制瓦斯爆炸火焰与压力的耦合分析

郑立刚^1,2, 王亚磊², 于水军^1,2, 朱小超², 李刚², 杜德朋², 窦增果²

1. 煤炭安全生产河南省协同创新中心, 河南焦作 454003;
2. 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

收稿日期:2018-04-23 修回日期:2018-05-17 出版日期:2018-09-05 发布日期:2018-09-05
通讯作者: 郑立刚
基金资助:
国家自然科学基金项目（51674104，51504083）；中国博士后科学基金项目（2013M540570）；河南省高等学校青年骨干教师资助项目（2012GGJS-053）；河南理工大学创新型科研团队（T2018-2）。

Coupled relationship between flame and overpressure of gas explosion inhibited by NaHCO₃

ZHENG Ligang^1,2, WANG Yalei², YU Shuijun^1,2, ZHU Xiaochao², LI Gang², DU Depeng², DOU Zengguo²

1. The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454003, Henan, China;
2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received:2018-04-23 Revised:2018-05-17 Online:2018-09-05 Published:2018-09-05
Supported by:
supported by the National Natural Science Foundation of China (51674104, 51504083) and the China Postdoctoral Science Foundation(2013M540570).

摘要/Abstract

摘要：

为研究粉体作用下瓦斯爆炸火焰与压力的耦合规律，在5 L石英管道中开展了不同浓度NaHCO₃抑制瓦斯爆炸的实验。结果表明：随着粉体浓度的升高，瓦斯爆炸压力波形逐渐由单峰曲线向双峰曲线过渡；高浓度粉体抑爆下，单位体积内粉体小颗粒较多，小颗粒快速分解抑制火焰传播，使粒径较大的粉体有较长的时间吸热分解，进一步抑制火焰的发展；火焰传播中后期，大颗粒粉体沉降造成空间内粉体分布不均，形成粉体浓度较低的燃烧区、浓度较高的粉体沉降汇集区和低浓度的小颗粒悬浮区，影响粉体中后期的抑爆效果；火焰前锋速度与爆炸超压随时间变化曲线的线形相似，火焰前锋速度能一定程度上反映管内燃烧强度，但瓦斯爆炸超压的升降并不完全取决于火焰前锋速度的变化；当火焰前锋速度较大时，短暂的速度降低不会立刻造成爆炸超压的减小。

关键词: 耦合, 甲烷, 沉降, 爆炸, NaHCO₃, 浓度

Abstract:

To study the coupled relationship between the flame propagation and the pressure built-up of gas explosions, the test was carried out in a 5 L quartz duct with different concentrations of NaHCO₃. The results showed that the pressure waveform of gas explosions gradually changed from a single-peak curve to a bimodal curve with the increase of the mass concentration. Moreover, there are more small particles per unit volume as the suppressant concentration was large enough, which would inhibit the flame propagation firstly and then prolonged the endothermic time of larger powders, making the flame front be further inhibited. In the middle and late stages of the flame propagation, the settlement of large particles resulted in the uneven distribution of powders in space, which significantly affected the inhibition efficiencies. The distribution of powders in the duct can be divided into three regions:the combustion zone with low powder concentration, the sedimentation and collection zone of large particles with high mass concentration and the suspension zone of small particles with low powder concentration. The time dependence of the flame front velocity was similar to that of overpressure. Although the flame front velocity can reflect the intensity of the combustion to some extent, the rise and fall of the overpressure cannot determine entirely by the trend of the flame front velocity. The explosion overpressure wouldn't decrease immediately with the transient reduction of the flame front velocity when the flame front velocity was large enough.

Key words: coupling, methane, sedimentation, explosions, NaHCO₃, concentration

中图分类号:

TD712

郑立刚, 王亚磊, 于水军, 朱小超, 李刚, 杜德朋, 窦增果. NaHCO₃抑制瓦斯爆炸火焰与压力的耦合分析[J]. 化工学报, 2018, 69(9): 4129-4136.

ZHENG Ligang, WANG Yalei, YU Shuijun, ZHU Xiaochao, LI Gang, DU Depeng, DOU Zengguo. Coupled relationship between flame and overpressure of gas explosion inhibited by NaHCO₃[J]. CIESC Journal, 2018, 69(9): 4129-4136.

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NaHCO₃抑制瓦斯爆炸火焰与压力的耦合分析

Coupled relationship between flame and overpressure of gas explosion inhibited by NaHCO₃

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