Characteristics of CMC/ZrCit/GDL fire extinguishing gel used for mines

doi:10.16265/j.cnki.issn1003-3033.2020.01.018

Abstract

Abstract: In order to prevent and control spontaneous combustion of coal, a new fire-suppression gel is developed for mines, which consists of sodium carboxymethylcellulose (CMC), zirconium citrate (ZrCit) and gluconic-δ-lactone (GDL). Firstly, gelation time and viscosity of gel at different ratios were tested, and suitable ratios for fire preventing and extinguishing in different situations were selected. Then, its resistance performance and effects on weight loss and heat release of coal were analyzed through programming temperature and thermogravimetric (TG) experiments. The results show that addition of gel suppresses spontaneous combustion of coal. Gelation occurs during penetration, and it is cemented to coal surface and fills up cracks. When being heated to 180 ℃ within same time, water losses about 30% weight more than No.32 gel, which indicates that gel has strong water retention and good thermal stability. It is demonstrated by fire extinguishing simulation experiments that using gel for extinguishing fire can cool temperature quickly and will not cause re-ignition easily.

Key words: coal spontaneous combustion, CMC/ZrCit/GDL gel, resistance performance, thermal stability, fire extinguishing

CLC Number:

X936

DONG Kaili, WANG Junfeng, LIANG Zewen, SHI Qi. Characteristics of CMC/ZrCit/GDL fire extinguishing gel used for mines[J]. China Safety Science Journal, 2020, 30(1): 114-120.

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