【摘要】：我國礦井火災(zāi)頻發(fā),尤其在邊角余煤、老采空區(qū)、復(fù)采工作面都是發(fā)生火災(zāi)高發(fā)區(qū)。荊各莊礦開采三十多年,12煤層從未出現(xiàn)過自然發(fā)火事故,但是近幾年12煤層復(fù)采區(qū)自然發(fā)火頻繁,并且9煤層復(fù)采區(qū)煤體內(nèi)賦存大量一氧化碳?xì)怏w,所以選定荊各莊礦為研究對象。結(jié)合煤自燃氧化機(jī)理的分析基礎(chǔ)之上,對復(fù)采區(qū)域和原生煤層的煤樣進(jìn)行了自燃氧化性能的分析。首先,采用程序升溫與氣相色譜儀聯(lián)用實(shí)驗(yàn),分析了CO指標(biāo)氣體隨溫度變化規(guī)律,可知煤自燃低溫氧化早期階段,復(fù)采過的煤更易于吸附氧,表現(xiàn)出了更強(qiáng)的氧化性能。其次,采用紅外光譜分析技術(shù),對50℃、70℃、80℃、100℃、120℃、160℃溫度下各煤樣的活性基團(tuán)變化進(jìn)行分析,結(jié)果顯示在低溫的條件下,煤分子結(jié)構(gòu)中,發(fā)生氧化反應(yīng)主要部分就是羥基、芳香烴、脂肪族類和含氧官能團(tuán),其含量變化最為明顯。通過綜合比較發(fā)現(xiàn),由于復(fù)采煤層早期的開采破壞了原有煤層結(jié)構(gòu)以及煤分子結(jié)構(gòu),使得復(fù)采區(qū)域煤的氧化性能發(fā)生了改變,自燃傾向性增強(qiáng),導(dǎo)致整體的自燃危險(xiǎn)程度增大。綜合理論分析和現(xiàn)場實(shí)測結(jié)果,針對荊各莊礦井開采后期自然發(fā)火特點(diǎn),通過研究荊各莊礦煤自燃發(fā)火規(guī)律,提出了一系列荊各莊礦的煤炭自燃防治措施。研究成果對荊各莊礦提高煤炭采出率和安全開采具有重要的意義。
[Abstract]:Mine fires occur frequently in China, especially in edge coal, old goaf and remining face. In Jinggezhuang Coal Mine, there has never been a spontaneous combustion accident in coal seam No. 12 for more than 30 years, but in recent years, natural combustion occurs frequently in the area of coal seam 12, and a large amount of carbon monoxide gas exists in the coal body in the area of coal mining in coal seam 9. So choose Jinggezhuang mine as the research object. Based on the analysis of oxidation mechanism of coal spontaneous combustion, the spontaneous combustion oxidation performance of coal samples in remining area and primary coal seam is analyzed. Firstly, by using programmed temperature and gas chromatograph, the variation of CO index gas with temperature is analyzed. It is known that in the early stage of low temperature oxidation of coal spontaneous combustion, the remined coal is easier to adsorb oxygen and has stronger oxidation performance. Secondly, the changes of active groups of coal samples at 50 鈩，

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