凝胶泡沫的阻化特性研究

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为了解决煤矿自燃和瓦斯防治的难题,研制出新型煤矿用材料—凝胶泡沫。采用表征指标气体CO释放量减少效果的阻化率ECO、表征煤样温升速率减小效果的ET和ER等3项指标评价凝胶泡沫的阻化特性,采用自制的阻化特性测试系统测试经凝胶泡沫处理的煤样与原煤样在程序升温下的差异。实验结果表明:凝胶泡沫能有效的减缓煤的氧化放热速率,抑制煤温的升高,阻化率达到62.23%,很好的抑制了CO在自燃过程中的释放量。在不同升温阶段起主导作用的阻化方式不同,30~100℃阶段主要是凝胶泡沫本身含水及吸附空气中的水的蒸发吸热作用,该阶段和原煤样的温差不大;100℃以后,水分完全蒸发,主要是凝胶泡沫膜覆盖煤体表面隔氧阻化作用,此阶段与原煤样的温差逐渐加大,阻化效果显著提高。 In order to solve the problem of coal spontaneous combustion and gas prevention and control, a new type of coal mine material, gel foam, was developed. The ECO, the EC and the ER, which characterize the CO 2 emission of the indicator gas, were used to evaluate the resistance of the gel foam. The self-made resistance-deteriorating characteristic test system The difference between the gelled foam-treated coal sample and the raw coal sample at programmed temperature rise. The experimental results show that the gel foam can effectively slow down the rate of coal oxidation and exothermic heat release, suppress the increase of coal temperature, and the resistivity reaches 62.23%, which can well suppress the release of CO during spontaneous combustion. The dominant mode of resistance was different in different temperature rise stages. The 30 ~ 100 ℃ phase was mainly the hydrogel endothermic effect of gel foam itself and the adsorption of water in the air. The temperature difference between this phase and the original coal sample was not big. After 100 ℃ , The water evaporates completely, mainly because the gel foam membrane covers the oxygen barrier effect of the surface of the coal body, and the temperature difference with the raw coal sample gradually increases at this stage, thereby remarkably improving the resistance.
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