Suppression characteristics of methane/coal dust explosions by active explosion suppression system in the large mining tunnel

IF 3.4 3区工程技术 Q2 ENGINEERING, CIVIL Fire Safety Journal Pub Date : 2024-09-06 DOI:10.1016/j.firesaf.2024.104251

Songling Jin , Wei Gao , Zichao Huang , Mingshu Bi , Haipeng Jiang , Rongjun Si , Guangcai Wen

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Abstract

To enhance intelligent prevention and control of methane/coal dust explosions in coal mines, the active explosion suppressor was developed. Methane/coal dust explosion suppression experiments were carried out in an 896-m mining tunnel. The suppression mechanism of NH₄H₂PO₄ powder during methane/coal dust explosions was elucidated. The results indicated that the device effectively prevented flame propagation within a 40 m radius by propelling NH₄H₂PO₄ powder using high-pressure nitrogen. There was a significant reduction in the intensity and destructiveness of the overpressure, with a maximum decrease of 61.43 %. The phosphorus-containing material produced by NH₄H₂PO₄ consumed free radicals through catalytic cycles of HOPO ⇔ PO₂ and HOPO ⇔ HPO₃⇔PO(OH)₂, weakening and interrupting the reactions, and suppressing flame development. NH₄H₂PO₄ reduced peak concentrations of CO and NO₂. Guidelines for explosion suppression of CH₄/coal dust explosions in large mining tunnel were presented. The findings provide technical and theoretical support for the prevention and control of methane/coal dust explosions in coal mines.

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大型采矿巷道中主动抑爆系统对甲烷/煤尘爆炸的抑制特性

为加强煤矿甲烷/煤尘爆炸的智能防控，开发了主动抑爆装置。在 896 米长的采矿巷道中进行了甲烷/煤尘爆炸抑制实验。阐明了 NH4H2PO4 粉末在甲烷/煤尘爆炸时的抑制机理。结果表明，该装置利用高压氮气推动 NH4H2PO4 粉末，有效阻止了半径为 40 米的火焰传播。超压的强度和破坏性明显降低，最大降幅达 61.43%。NH4H2PO4 产生的含磷物质通过 HOPO ⇔ PO2 和 HOPO ⇔ HPO3⇔PO(OH)2 的催化循环消耗自由基，削弱和中断反应，抑制火焰发展。NH4H2PO4 可降低 CO 和 NO2 的峰值浓度。提出了大型采矿巷道中 CH4/煤尘爆炸的抑爆准则。研究结果为预防和控制煤矿甲烷/煤尘爆炸提供了技术和理论支持。

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来源期刊

Fire Safety Journal 工程技术-材料科学：综合

CiteScore

5.70

自引率

9.70%

发文量

153

审稿时长

60 days

期刊介绍： Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.