【摘要】：煤層自燃問題不僅嚴(yán)重影響著煤炭工業(yè)的發(fā)展，同時(shí)也給煤炭生產(chǎn)帶來很大的安全問題。但由于實(shí)際條件下煤的自燃過程極其復(fù)雜且影響因素較多，因此，煤層自然發(fā)火期的預(yù)測(cè)、預(yù)報(bào)技術(shù)的發(fā)展受到嚴(yán)重制約。 本文以孫村煤礦的煤樣為研究對(duì)象，首先建立了煤自燃的熱點(diǎn)學(xué)說，認(rèn)為煤自燃是從部分孔隙的局部熱點(diǎn)開始的，在這些孔隙中由于煤的化學(xué)反應(yīng)不斷地產(chǎn)生熱量，當(dāng)產(chǎn)生的熱量和散失的熱量達(dá)到平衡時(shí)，即達(dá)到了自然發(fā)火的臨界點(diǎn)，文中根據(jù)相應(yīng)的熱點(diǎn)理論，采用電子顯微鏡對(duì)煤細(xì)觀進(jìn)行了分析，初步得到了煤自燃的溫度場(chǎng)和孔隙的變化規(guī)律。對(duì)于自然發(fā)火的臨界點(diǎn)，，本文基于熱平衡基礎(chǔ)建立了煤自燃評(píng)價(jià)參數(shù)θ，并在實(shí)驗(yàn)室試驗(yàn)中證明了該評(píng)價(jià)指標(biāo)的正確性，文中還對(duì)影響煤自燃的有關(guān)參數(shù)的特性進(jìn)行了分析，認(rèn)為孔隙率對(duì)自然發(fā)火期的影響最為明顯，其次是氧氣濃度，再次為煤樣初始溫度。由于孔隙率和供氧濃度是影響煤的活化能的主要影響因素，所以，應(yīng)注意煤活化能的研究。文中還建立了一套實(shí)驗(yàn)系統(tǒng)，該實(shí)驗(yàn)系統(tǒng)可在現(xiàn)場(chǎng)取樣，在煤礦進(jìn)行實(shí)驗(yàn)，得到的實(shí)驗(yàn)結(jié)果對(duì)于生產(chǎn)實(shí)際具有一定的指導(dǎo)意義。文中基于自燃理論與實(shí)驗(yàn)測(cè)定的煤樣數(shù)據(jù)，著重介紹了孫村礦煤層的自燃特性。分析得到了孫村煤層的自然發(fā)火期與煤層深度的關(guān)系、通風(fēng)風(fēng)速與二氧化碳解析率的關(guān)系、甲烷氣體的解吸量與礦井深度等關(guān)系。研究結(jié)果表明，所建立的實(shí)驗(yàn)系統(tǒng)能夠較好地模擬井下煤自燃過程，計(jì)算得到的自燃參數(shù)變化規(guī)律對(duì)于礦井生產(chǎn)具有實(shí)際指導(dǎo)意義。
[Abstract]:Coal seam spontaneous combustion not only seriously affects the development of coal industry, but also brings great safety problems to coal production. However, the process of spontaneous combustion of coal is extremely complex under the actual conditions and there are many influencing factors. Therefore, the prediction of spontaneous combustion period of coal seam and the development of forecasting technology are seriously restricted. In this paper, the coal samples of Suncun Coal Mine are taken as the research object. Firstly, the hot spot theory of coal spontaneous combustion is established. It is considered that the spontaneous combustion of coal begins from the local hot spot of some pores, in which the heat is produced continuously because of the chemical reaction of coal. The critical point of spontaneous combustion has been reached when the heat produced and the heat lost have reached the equilibrium. According to the relevant hot spot theory, the microscopic analysis of coal is carried out by means of electron microscope. The temperature field and pore variation of coal spontaneous combustion were preliminarily obtained. For the critical point of spontaneous combustion, the evaluation parameter 胃 of coal spontaneous combustion is established on the basis of heat balance, and the correctness of the evaluation index is proved in the laboratory test. The characteristics of the related parameters that affect the spontaneous combustion of coal are also analyzed in this paper. It is considered that the porosity has the most obvious effect on the spontaneous combustion period, followed by the oxygen concentration and the initial temperature of the coal sample. Since porosity and oxygen supply concentration are the main factors affecting the activation energy of coal, attention should be paid to the study of activation energy of coal. A set of experimental system has been set up in this paper. The experimental system can be sampled on the spot and tested in coal mine. The experimental results are of certain guiding significance for practical production. Based on the spontaneous combustion theory and experimental data, the spontaneous combustion characteristics of coal seam in Suncun Coal Mine are introduced in this paper. The relationship between the spontaneous combustion period of Suncun coal seam and coal seam depth, the relationship between ventilation wind speed and carbon dioxide resolution rate, and the relationship between methane desorption amount and mine depth are obtained. The results show that the established experimental system can simulate the spontaneous combustion process of underground coal well, and the calculated variation law of spontaneous combustion parameters is of practical significance for mine production.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)（北京）
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD752.2

【共引文獻(xiàn)】

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本文編號(hào)：2185161