Experimental study and mechanism analysis of combined explosion suppression for the methane explosion in a pipe network

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (10) : 10-20.

JIA Jinzhang1,2，ZHANG Xianru*1,2,3，WU Wenrui3

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Abstract

In mine operations and natural gas transportation operations, the shock wave and flame wave caused by methane explosion bring great harm.In order to reduce the damage caused by explosion to the life and property safety, the fillability of Fe-nickel foam and powder combination was utilized in a self-built pipe network system.The optimal combination of foamed iron-nickel and powder was obtained through the explosion suppression experiment in the pipe network.The mechanism of NH4H2PO4 microsuppression of methane explosion was analyzed by using the pyrolytic characteristics of powder and by Materials Studio analysis.The experimental results show that the combination of 30-ppi foamy Fe-Ni and 70 gNH4H2PO4 powder can effectively inhibit the methane explosion in the pipe network, and the peak methane explosion pressure can decrease by up to 82.5%.The flame propagation speed of each branch is reduced to 10.01 m/s, 10.99 m/s, 11.78 m/s and 9.78 m/s respectively.The peak temperature of each branch can be reduced to 359 K, 341 K, 324 K, and 337 K respectively.The mechanism of this combination to inhibit methane explosion is mainly reflected in the endothermic reaction of the two, and the chemical inhibition is reflected in the decomposition of a large number of active groups such as NH3•, NH2• and NH• when heated to capture the key free radicals in the methane explosion, reducing the concentration of free radicals required for the methane explosion process.

Key words

pipe network system / methane explosion / explosion suppression mechanism / combined suppression

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JIA Jinzhang1, 2, ZHANG Xianru1, 2, 3, WU Wenrui3. Experimental study and mechanism analysis of combined explosion suppression for the methane explosion in a pipe network[J]. Journal of Vibration and Shock, 2025, 44(10): 10-20

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