Study on inhibition effect of active composite powder for methane explosions

doi:10.16265/j.cnki.issn1003-3033.2026.02.0668

Abstract

Abstract:

To obtain the powder suppressant with greater inhibition effect, NaHCO₃, Al(OH)₃, K₂CO₃ and NH₄H₂PO₄ were mixed by a compounding method, and a new composite powder was obtained. A visual spherical vessel was applied to study the effects of the composite powder with different mixing ratios on methane explosion overpressure, flame propagation and free radical production. The results indicate that as the mass proportion of NaHCO₃, Al(OH)₃, K₂CO₃ and NH₄H₂PO₄ is 1∶1∶2∶1, the inhibition effect of composite powder is significantly greater than that of the single powder. The synergistic mechanisms of the composite powder are as follows: Before 250 ℃, the composite powder undergoes a metathesis reaction, a large number of gases such as H₂O, CO₂ and NH₃ are released. In the early stage of methane explosion, the energy is absorbed and methane is diluted by the gases, so the rapid flame propagation is inhibited. NH₄H₂PO₄ plays a role in absorbing C-containing free radicals during methane combustion. This effect is enhanced when powder is mixed, leading to a further inhibition for methane combustion reaction.

Key words: composite powder, methane explosion, inhibition effect, synergistic effect, flame propagation, free radical

CLC Number:

X932爆炸安全与防火、防爆

ZHAO Tenglong, WANG Fengxiao, LI Zihao, YIN Xiaotong. Study on inhibition effect of active composite powder for methane explosions[J]. China Safety Science Journal, 2026, 36(2): 180-188.

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自由基	·CH₂O	·H	·OH	·CH	·CHO
波长λ	412.10	656.25	306.36	314.50	318.60
自由基	·O	·CO	·NO	·CN	―
波长λ	470.50	199.09	237.02	359.00	―

序号	反应式
1	K₂CO₃ + NH₄H₂PO₄ → CO₂ + NH₃ + H₂O + K₃PO₄
2	NaHCO₃ + NH₄H₂PO₄ → CO₂ + NH₃ + H₂O + Na₃PO₄
3	Al(OH)₃ + NH₄H₂PO₄ → NH₃ + H₂O + AlPO₄

序号	反应式
1	CO₂ + NH₃ + H₂O → NH₄HCO₃ (CO₂过量)
2	CO₂ + NH₃ + H₂O → (NH₄)₂CO₃ (NH₃过量)
3	CO₂ + NH₃ → CO(NH₂)₂ + H₂O
4	CO + NH₃ → HCONH₂
5	HCONH₂ + H₂O → NH₄HCO₂