【摘要】：煤炭開采面臨煤自然發(fā)火等災害的嚴重威脅,在分析現(xiàn)有防滅火技術(shù)特征的基礎上,制備了1種水泥基泡沫材料。探討了水泥基泡沫形成機理,包括水基泡沫與漿液擾流混合發(fā)泡,表面活性劑增加顆粒疏水性及顆粒穩(wěn)定泡沫液膜,液膜中水泥、粉煤灰顆粒水化反應及促凝劑加速凝結(jié)固化。搭建了小型抑制煤堆自燃試驗平臺,開展了煤堆自燃溫升變化及黃泥漿、無機凝膠、阻化泡沫、水泥基泡沫等防滅火介質(zhì)降溫效果試驗,結(jié)果表明:水泥基泡沫具有向上堆積的能力,能對高溫煤顆粒進行覆蓋、包裹,并具有較好的熱穩(wěn)定性,總體降溫性能最佳;壓注后,監(jiān)測時間0~900 s內(nèi),徑向距離為0.1,0.2,0.3,0.4,0.5 m處溫度分別從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，

本文編號：2218535