矿用防灭火凝胶的制备和特性研究
Study on Preparation and Characteristics of Mine Fire Extinguishing Gel
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摘要: 为防治煤自燃,研制了一种由羧甲基纤维素钠、柠檬酸锆和葡萄糖酸-δ-内酯组成的矿井防灭火凝胶,制备凝胶并测试了不同配比下的成胶时间,选出适合不同情况下煤矿防灭火的凝胶配比;然后测试了凝胶的失水率,结果表明凝胶热稳定性良好,固水作用强;程序升温实验表明凝胶的加入降低了煤自燃过程中的耗氧速率,减少了CO的产生,可以抑制煤氧反应进程;通过热重曲线,计算凝胶对煤活化能的影响,又通过红外实验分析了凝胶对煤在自燃过程中基团的影响。结果表明:凝胶的加入提高了煤氧反应所需的能量,增大了反应难度;凝胶的加入抑制了C-H组分向含氧官能团的转化,减少了活性官能团的数量,抑制了煤的氧化反应。Abstract: In order to prevent coal spontaneous combustion, a new type mine fire extinguishing gel which consists of sodium carboxymethylcellulose, zirconium citrate and gluconic-δ-lactone has been developed. The gelation time of different ratios of gel components was tested and the optimum fire-extinguishing ratio suitable for coal mine under different conditions was determined. Then the water loss rate of the gel was tested, the results show that the gel has good thermal stability and strong water retention ability. The temperature-programming experiment shows that the addition of gel reduces the oxygen consumption rate and the production of CO during coal spontaneous combustion, which can suppress the oxidation process of coal. The influence of gel on coal activation energy was calculated and analyzed by thermogravimetric curves, the results show that the addition of gel increases the energy required for coal-oxygen reaction and increases the difficulty of the reaction. FTIR was also used introduced to analyze the effect of gel on active groups of coal during heating coal oxidation, the results show that the addition of the gel inhibits the conversion of C-H components to oxygen-containing functional groups, and reduces the number of active functional groups, inhibits the oxidation reaction of coal.
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Keywords:
- coal spontaneous combustion /
- gel /
- gelation time /
- stability /
- inhibition
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