Study on synergistic fire extinguishing effect of typical superfine dry powder and inert gas

doi:10.16265/j.cnki.issn 1003-3033.2021.11.021

Abstract

Abstract: As inert gas is often used as driving gas in powder fire extinguishing technology, in order to improve the technology and explore the synergistic fire extinguishing effect of inert gas and powder, fire extinguishing ability of ultra-fine KHCO₃ dry powder, ultra-fine KH₂PO₄ dry powder and ultra-fine ammonium phosphate ABC dry powder was studied by using improved cup burner. Then, with ultra-fine KHCO₃ dry powder and ultra-fine ammonium phosphate ABC dry powder as research objects, CO₂, N₂, He and Ar as inert gas extinguishing agents, their gas-solid synergistic fire extinguishing effects were studied. The results show that in terms of fire extinguishing ability, they rank as ultra-fine KHCO₃ > ultra-fine ammonium phosphate ABC dry powder > ultra-fine KH₂PO₄. The middle one shows good gas-solid synergistic fire extinguishing effect with all four kinds of inert gas, with their peak values are 0.47, 0.53, 0.54 and 0.51 respectively, and corresponding gas volume percentage at about 5.5%, 5.9%, 8.7% and 14.4%. However, that of KHCO₃ dry powder with the four of them is not obvious.

Key words: superfine dry powder, inert gas, synergistic fire extinguishing effect, compound fire extinguishing agent, ABC powder

CLC Number:

X932

LIANG Tianshui, LIN Zhengxiong, MAO Siyuan, ZHONG Wei, ZHAO Jun. Study on synergistic fire extinguishing effect of typical superfine dry powder and inert gas[J]. China Safety Science Journal, 2021, 31(11): 148-154.

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