潞安矿区3~#煤层构造煤孔隙结构与瓦斯解吸特性研究

发布时间：2018-05-04 12:24

本文选题：构造煤 + 孔隙结构　；参考：《煤炭科学研究总院》2016年硕士论文

【摘要】：由于受应力作用,构造煤孔隙结构复杂、渗透性差、强度低,易造成瓦斯异常涌出和突出灾害。本文以微观观测和流体侵入相结合的手段,从孔容、比表面积及单位孔容的比表面积(相对比表面积)方面对孔隙结构进行了深入研究；并在实验测试基础上对煤的吸附解吸特性进行了对比研究,探讨了孔隙结构与解吸特性的相关性,根据研究结果,提出了构造煤孔隙结构与解吸特性线性关系。研究成果主要有以下几个部分：(1)论文采用扫描电镜(SEM)法对潞安矿区3#煤层构造煤及原生煤进行了微观观测,定量分析了SEM扫描图片中孔隙密度,结果表明：1千、5千和1万倍率扫描图片中构造煤孔隙密度约为原生煤的1.25、1.57、1.75倍。采用压汞法和低温氮吸附法测试了潞安矿区3#煤层构造煤孔隙结构参数,结果表明：微孔和过渡孔体积占孔容的主要部分,构造煤孔容约为原生煤的1.46倍,构造煤比表面积约为原生煤的1.2倍。相对比表面积约为原生煤的1.19倍。(2)实验室开展了高压等温吸附实验,发现构造煤瓦斯吸附量约为原生煤的1.16倍；利用吸附-解吸装置测定了构造煤和原生煤在不同吸附平衡压力下瓦斯初期解吸规律及120min内的解吸量,在0.5MPa、1.5MPa、2.5MPa三种吸附平衡压力下,构造煤解吸量平均值分别为原生煤的1.06、1.15、1.17倍；第1min、 3-5min内解吸量分别为原生煤的1.47、1.14倍。(3)分析了孔隙结构与解吸特性的相关性,发现瓦斯吸附量、解吸量随相对比表面积增大而增大,具有较好的线性相关性；原生煤相关度高于构造煤,压力越大,相关度越高。(4)在潞安矿区郭庄矿、高河矿现场测试了3#煤层构造煤和原生煤在第1min内和第3-5min内的瓦斯解吸量,通过实测数据发现郭庄矿、高河矿构造煤在两段时间内的平均解吸量相对原生煤高48.6%和15.9%,47.61%和14.36%。与实验室解吸规律保持较好的一致性。
[Abstract]:Because of the stress, the pore structure of structural coal is complex, the permeability is poor, and the strength is low, which can easily cause abnormal gas emission and outburst disaster. In this paper, the pore structure is studied from the aspects of pore volume, specific surface area and specific surface area per unit pore volume (relative specific surface area) by means of micro observation and fluid intrusion. On the basis of experimental tests, the adsorption and desorption characteristics of coal were compared and studied, and the correlation between pore structure and desorption characteristics was discussed. Based on the results, the linear relationship between pore structure and desorption characteristics of structural coal was proposed. The main research results are as follows: (1) the microscopic observation of structural coal and primary coal in coal seam of Lu'an mining area was carried out by using scanning electron microscope (SEM) method, and the pore density in scanning image of SEM was quantitatively analyzed. The results show that the pore density of tectonic coal is about 1.251.57 times as much as that of primary coal. The pore structure parameters of structural coal in coal seam in Luan mining area were measured by mercury injection method and low temperature nitrogen adsorption method. The results showed that the volume of micropore and transition pore occupied the main part of pore volume, and the pore volume of tectonic coal was about 1.46 times of that of primary coal. The specific surface area of tectonic coal is about 1.2 times of that of primary coal. The relative specific surface area is about 1.19 times as high as that of the primary coal.) the isothermal adsorption experiment at high pressure has been carried out in the laboratory. It is found that the gas adsorption capacity of the tectonic coal is about 1.16 times that of the original coal. The initial desorption law of gas and the desorption amount in 120min of the structural coal and the primary coal under different adsorption equilibrium pressures were measured by means of adsorption-desorption apparatus. Under the three kinds of adsorption equilibrium pressure of 0.5 MPA, 1.5 MPA and 2.5 MPA, the average desorption capacity of the tectonic coal was 1.06 ~ 1.15 ~ 1.17 times as high as that of the original coal, respectively. In the first minute, the desorption amount in 3-5min was 1.47% 1.14 times as high as that of the primary coal. The correlation between the pore structure and desorption characteristics was analyzed. It was found that the gas adsorption capacity and desorption capacity increased with the increase of the relative specific surface area and had a good linear correlation. The correlation degree of the primary coal is higher than that of the tectonic coal, and the pressure is higher, the correlation is higher. 4) in Guozhuang Mine, Lu'an Mining area, the gas desorption capacity of the structural coal and the primary coal in the coal seam in the 1min and the 3-5min are tested in the field of Gaohe Coal Mine. The average desorption capacity of tectonic coal in Gaohe Mine in two periods is 48.6% higher than that of primary coal, and 47.61% and 14.36% higher than that of primary coal. It is consistent with the desorption law in laboratory.
【学位授予单位】：煤炭科学研究总院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD712

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