本文關鍵詞： 突出煤 理化特性 甲烷 吸附特性 分子模擬　出處：《中國礦業(yè)大學》2013年博士論文　論文類型：學位論文

【摘要】：瓦斯災害不僅是貴州也是全國煤礦面臨的重大災害之一，隨著礦井開采深度的增加，瓦斯災害越來越嚴重，嚴重地制約了煤炭工業(yè)的持續(xù)健康發(fā)展。瓦斯災害是個復雜問題，煤與瓦斯突出機理至今還沒有完全清楚。一般認為，煤的物理力學特性、煤層瓦斯和地應力是影響瓦斯災害的三個重要方面，而每個方面又由許多因素綜合作用。本文采用理論分析、物理實驗和數(shù)值模擬相結(jié)合的方法對貴州突出煤的物理化學特性進行了研究，并提出了基于突出煤理化特性的瓦斯防治技術。 通過對貴州突出煤的形成及分布規(guī)律分析，確定了合理的煤樣選取點。研究認為受聚煤盆地、沉積環(huán)境、成煤條件、地質(zhì)運動、控煤構(gòu)造等因素影響，貴州主要富煤區(qū)為六盤水煤田、織納煤田、黔北煤田、興義煤田，其賦存煤層大多數(shù)為煤與瓦斯突出煤層。 通過現(xiàn)場觀測及實驗室測試分析，從工業(yè)分析、元素分析、大分子結(jié)構(gòu)分析及破壞類型、顯微結(jié)構(gòu)、孔隙結(jié)構(gòu)、比表面積等幾個方面，獲得了貴州突出煤的物理化學特性。發(fā)現(xiàn)貴州突出煤多為破壞強烈的Ⅲ類煤，平行層理面存有晶體物質(zhì)，層理面和節(jié)理面均有孔隙或裂隙，孔徑基本上在0～10nm之間。孔徑為3～5nm的微孔在煤樣中最為豐富，為瓦斯主要吸附空間。 系統(tǒng)地研究了煤對甲烷吸附的分子模擬理論，提出了煤對甲烷吸附的分子模擬算法。針對貴州突出煤對甲烷吸附的特點，提出采用狹縫孔物理模型和微孔填充吸附機理相結(jié)合的吸附模型，以及巨正則系統(tǒng)的Monte Carlo理論研究煤的甲烷分子模擬，并通過粒子的插入與刪除實現(xiàn)煤對甲烷分子的吸附與解吸過程，獲得了孔隙、溫度、灰分、水分等對甲烷吸附的影響規(guī)律。 開發(fā)了專門針對煤對瓦斯吸附的分子模擬軟件，驗證分析表明模擬得到的吸附等溫線與實驗基本吻合。利用開發(fā)的分子模擬軟件，以現(xiàn)場與實驗室測定的數(shù)據(jù)為基礎，，對不同條件下的瓦斯吸附情況進行模擬。模擬結(jié)果表明，煤的孔隙率、灰分、水分與溫度等對煤的吸附特性均有影響，其中灰分影響最大。 研究成果為從分子角度預測煤的吸附特性提供了一種新的途徑，并提高了分子模擬技術研究煤吸附瓦斯特性的可靠性，可為預測煤層瓦斯壓力、瓦斯含量等瓦斯參數(shù)提供理論基礎。
[Abstract]:Gas disaster is not only one of the major disasters faced by coal mines in Guizhou, but also the whole country. With the increase of mining depth, gas disaster becomes more and more serious, which seriously restricts the sustainable and healthy development of coal industry. Gas disaster is a complex problem. The mechanism of coal and gas outburst has not been fully understood. It is generally believed that the physical and mechanical characteristics of coal, the gas in coal seam and the ground stress are the three important aspects that affect gas disaster. In this paper, the physicochemical characteristics of Guizhou outburst coal are studied by means of theoretical analysis, physical experiment and numerical simulation. The gas prevention technology based on the physical and chemical characteristics of outburst coal is put forward. Based on the analysis of the formation and distribution of outburst coal in Guizhou, a reasonable coal sample selection point is determined. It is considered that the coal accumulation basin, sedimentary environment, coal-forming conditions, geological movement, coal-controlling structure and other factors affect the formation and distribution of outburst coal. The main coal-rich areas in Guizhou are Liupanshui coalfield, Zhina coalfield, Qianbei coalfield and Xingyi coalfield, most of which are coal and gas outburst coal beds. Through field observation and laboratory test and analysis, from industrial analysis, element analysis, macromolecular structure analysis and damage type, microstructure, pore structure, specific surface area, etc. The physicochemical characteristics of outburst coal in Guizhou are obtained. It is found that the outburst coal in Guizhou is mostly type 鈪

本文編號：1546209