水泥基泡沫形成机理及抑制煤堆自燃试验研究
发布时间：2018-09-02 06:27
【摘要】：煤炭开采面临煤自然发火等灾害的严重威胁,在分析现有防灭火技术特征的基础上,制备了1种水泥基泡沫材料。探讨了水泥基泡沫形成机理,包括水基泡沫与浆液扰流混合发泡,表面活性剂增加颗粒疏水性及颗粒稳定泡沫液膜,液膜中水泥、粉煤灰颗粒水化反应及促凝剂加速凝结固化。搭建了小型抑制煤堆自燃试验平台,开展了煤堆自燃温升变化及黄泥浆、无机凝胶、阻化泡沫、水泥基泡沫等防灭火介质降温效果试验,结果表明:水泥基泡沫具有向上堆积的能力,能对高温煤颗粒进行覆盖、包裹,并具有较好的热稳定性,总体降温性能最佳;压注后,监测时间0~900 s内,径向距离为0.1,0.2,0.3,0.4,0.5 m处温度分别从376.98,376.00,374.38,372.14,369.27℃下降到21,26,29,35,42℃。
[Abstract]:Coal mining is facing the serious threat of coal spontaneous combustion and other disasters. Based on the analysis of the characteristics of existing fire prevention and extinguishing technology, a kind of cement-based foam material was prepared. The formation mechanism of cement-based foam was discussed, including mixed foaming of water-based foam and slurry turbulence, surfactant increasing particle hydrophobicity and particle stabilizing foam liquid film, hydration reaction of cement and fly ash particles in liquid film and accelerated condensation and solidification of coagulant. A small test platform for suppressing spontaneous combustion of coal pile was set up, and the temperature rise of spontaneous combustion of coal pile and the cooling effect of yellow mud, inorganic gel, anti-foam, cement based foam and other anti-fire media were tested. The results show that the cement-based foam has the ability to pile up upward, can cover and wrap the coal particles at high temperature, and has better thermal stability, the overall cooling performance is the best, and the monitoring time is less than 900 s after injection. When the radial distance is 0.1g / 0.2U 0.3U 0.4m, the temperature decreases from 376.98376.00374.38372.14369.27 鈩，
本文编号：2218535
[Abstract]:Coal mining is facing the serious threat of coal spontaneous combustion and other disasters. Based on the analysis of the characteristics of existing fire prevention and extinguishing technology, a kind of cement-based foam material was prepared. The formation mechanism of cement-based foam was discussed, including mixed foaming of water-based foam and slurry turbulence, surfactant increasing particle hydrophobicity and particle stabilizing foam liquid film, hydration reaction of cement and fly ash particles in liquid film and accelerated condensation and solidification of coagulant. A small test platform for suppressing spontaneous combustion of coal pile was set up, and the temperature rise of spontaneous combustion of coal pile and the cooling effect of yellow mud, inorganic gel, anti-foam, cement based foam and other anti-fire media were tested. The results show that the cement-based foam has the ability to pile up upward, can cover and wrap the coal particles at high temperature, and has better thermal stability, the overall cooling performance is the best, and the monitoring time is less than 900 s after injection. When the radial distance is 0.1g / 0.2U 0.3U 0.4m, the temperature decreases from 376.98376.00374.38372.14369.27 鈩，
本文编号：2218535
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