Impact on fire-fighting performance of high-valent metal ions cross-linking system

doi:10.16265/j.cnki.issn 1003-3033.2021.07.016

Abstract

Abstract: In order to compare impact of central ion's high valence state on fire extinguishing performance of gel, with sodium carboxymethyl cellulose cross-linking with aluminum citrate and zirconium citrate, Zr⁴⁺ cross-linking system and Al³⁺ cross-linking system were tested, gelling time was measured and proportioning scheme was optimized. Then, changes of index gases and crossing point temperature were studied through programmed temperature test, and FTIR was adopted to explore flame retardant mechanism of gel. The results show that during programmed temperature process, Zr⁴⁺ cross-linking system reduces generation amount of CO by 56%, and that of C₂H₄ by 54% while crossing point temperature is increased by 32 ℃, and its inhibition effect is better than that of Al³⁺ cross-linking system. Moreover, this system better inhibits oxidation of hydroxyl groups in coal, making methyl and methylene groups less involved in coal-oxygen reactions, and promoting generation of carbonyl groups and oxygen-containing functional groups.

Key words: high-valent metal ions, cross-linking system, fire fighting performance, gel, programmed temperature, infrared spectroscopy (FTIR), coal spontaneous combustion

CLC Number:

X936

LIANG Zewen, WANG Junfeng, DONG Kaili, ZHANG Yulong. Impact on fire-fighting performance of high-valent metal ions cross-linking system[J]. China Safety Science Journal, 2021, 31(7): 113-119.

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