【摘要】：煤層自燃問題不僅嚴重影響著煤炭工業(yè)的發(fā)展，同時也給煤炭生產帶來很大的安全問題。但由于實際條件下煤的自燃過程極其復雜且影響因素較多，因此，煤層自然發(fā)火期的預測、預報技術的發(fā)展受到嚴重制約。 本文以孫村煤礦的煤樣為研究對象，首先建立了煤自燃的熱點學說，認為煤自燃是從部分孔隙的局部熱點開始的，在這些孔隙中由于煤的化學反應不斷地產生熱量，當產生的熱量和散失的熱量達到平衡時，即達到了自然發(fā)火的臨界點，文中根據(jù)相應的熱點理論，采用電子顯微鏡對煤細觀進行了分析，初步得到了煤自燃的溫度場和孔隙的變化規(guī)律。對于自然發(fā)火的臨界點，，本文基于熱平衡基礎建立了煤自燃評價參數(shù)θ，并在實驗室試驗中證明了該評價指標的正確性，文中還對影響煤自燃的有關參數(shù)的特性進行了分析，認為孔隙率對自然發(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，應注意煤活化能的研究。文中還建立了一套實驗系統(tǒng)，該實驗系統(tǒng)可在現(xiàn)場取樣，在煤礦進行實驗，得到的實驗結果對于生產實際具有一定的指導意義。文中基于自燃理論與實驗測定的煤樣數(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系、通風風速與二氧化碳解析率的關系、甲烷氣體的解吸量與礦井深度等關系。研究結果表明，所建立的實驗系統(tǒng)能夠較好地模擬井下煤自燃過程，計算得到的自燃參數(shù)變化規(guī)律對于礦井生產具有實際指導意義。
[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.
【學位授予單位】：中國礦業(yè)大學（北京）
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TD752.2

【共引文獻】

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本文編號：2185161