七星矿煤体的微观孔隙结构特征
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摘要
为有效控制瓦斯固化防突技术中水合物的饱和度,利用美国康塔Pore Master 33型压汞仪,对七星矿不同粒径型煤、原煤开展压汞实验,测定孔容、孔径分布。基于压汞实验总孔容值,获得不同粒径下制备型煤所需的初始含水量。结果表明,型煤与原煤进汞曲线均为Γ形,退汞曲线近似为直线。相同粒径型煤孔容差别较小,不同原煤试样孔容差别较大。不同粒径型煤孔隙中,大孔、中孔最为发育,有利于瓦斯水合物在煤体中生成。原煤孔径分布较分散,0.180~0.250 mm粒径煤体的总孔容均值最大,离散程度较小,可作为含瓦斯水合物煤体三轴实验所使用粒径。该研究为煤体中瓦斯水合物的生成及其饱和度控制提供了理论依据。
This paper is designed for the effective control of hydrate saturation in gas solidification and outburst prevention technology. The research involves performing mercury injection experiments on briquette coal with different particle size and on raw coal from Qixing Coal Mine,using the American Conta Master Pore Mercury Model 33; determining pore volume and pore size distribution; and identifying initial water content required for the preparation of briquette coal with different particle,based on the total pore volume value from mercury injection experiments. The results demonstrate that both briquette and raw coal have Γ-shaped intrusion mercury curves,and the extrusion mercury curves approximate to straight lines; the briquette coal with same particle size exhibits a smaller pore volume deviation and different raw coal samples show greater pore volume deviations; the best-developed macroporous and mesopore in the pores of briquettes with different grain sizes encourage the formation of gas hydrates in the coal; the pore size of the raw coal is of more dispersed distribution; and the occurrence of the maximum mean of total pore volume and the smallest degree of dispersion in the coal sample with 0. 180-0. 250 mm particle size could allows the particle size to be used for the triaxial test on coal containing methane gas hydrate. The research could provide a theoretical basis for hydrate formation and its saturation control in the briqutte coal.
This paper is designed for the effective control of hydrate saturation in gas solidification and outburst prevention technology. The research involves performing mercury injection experiments on briquette coal with different particle size and on raw coal from Qixing Coal Mine,using the American Conta Master Pore Mercury Model 33; determining pore volume and pore size distribution; and identifying initial water content required for the preparation of briquette coal with different particle,based on the total pore volume value from mercury injection experiments. The results demonstrate that both briquette and raw coal have Γ-shaped intrusion mercury curves,and the extrusion mercury curves approximate to straight lines; the briquette coal with same particle size exhibits a smaller pore volume deviation and different raw coal samples show greater pore volume deviations; the best-developed macroporous and mesopore in the pores of briquettes with different grain sizes encourage the formation of gas hydrates in the coal; the pore size of the raw coal is of more dispersed distribution; and the occurrence of the maximum mean of total pore volume and the smallest degree of dispersion in the coal sample with 0. 180-0. 250 mm particle size could allows the particle size to be used for the triaxial test on coal containing methane gas hydrate. The research could provide a theoretical basis for hydrate formation and its saturation control in the briqutte coal.
引文
[1]宫伟力,汪虎,何满潮,等.深部开采中岩爆岩块弹射速度的理论与实验[J].煤炭学报,2015,40(10):2269-2278.
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[6]邹俊鹏,陈卫忠,杨典森,等.基于SEM的珲春低阶煤微观结构特征研究[J].岩石力学与工程学报,2016,35(9):1805-1814.
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[8]陈贞龙,汤达祯,许浩,等.黔西滇东地区煤层气储层孔隙系统与可采性[J].煤炭学报,2010,35(S1):158-163.
[9]赵兴龙,汤达祯,许浩,等.煤变质作用对煤储层孔隙系统发育的影响[J].煤炭学报,2010,35(9):1506-1511.
[10]曹涛涛,宋之光,罗厚勇,等.煤、油页岩和页岩微观孔隙差异及其储集机理[J].天然气地球科学,2015,26(11):2208-2218.
[11]刘培生,马晓明.多孔材料检测方法[M].北京:冶金工业出版社,2006.
[12]中国科学院过程工程研究所,北京市理化分析测试中心.GB/T 21650.1—2008压汞法和气体吸附法测定固体材料孔径分布和孔隙度[S].北京:中国标准出版社,2008.
[13]顾熠凡,王兆丰,戚灵灵.基于压汞法的软、硬煤孔隙结构差异性研究[J].煤炭科学技术,2016,44(4):64-67.
[14]张先伟,孔令伟.利用扫描电镜、压汞法、氮气吸附法评价近海黏土孔隙特征[J].岩土力学,2013,34(S2):134-142.
[15]程庆迎,黄炳香,李增华.煤的孔隙和裂隙研究现状[J].煤炭工程,2011(12):91-93.
[16]吉登高,王祖讷,张丽娟,等.粉煤成型原料粒度组成的实验研究[J].煤炭学报,2005(1):100-103.
[17]陈光进,孙长宇,马庆兰.气体水合物科学与技术[M].北京:化学工业出版社,2007.
[18]刘昌龄,业渝光,孟庆国.显微激光拉曼光谱测定甲烷水合物的水合指数[J].光谱学与光谱分析,2010,30(4):963-966.
[2]高霞,刘文新,高橙,等.含瓦斯水合物煤体强度特性三轴实验研究[J].煤炭学报,2015,40(12):2829-2835.
[3]Penumadu D,Dean J.Compressibility effect in evaluating the poresize distribution of kaolin clay using mercury intrusion porosimetry[J].Canadian Geo-technical Journal,2000,37(2):393-405.
[4]Mattssonn S,Nystrom C.The use of mercury porosimetry in assessing the effect of different binders on the pore structure and bonding properties of tablets[J].European Journal of Pharmaceutics and Biopharmaceutics,2001,52(2):237-247.
[5]降文萍,宋孝忠,钟玲文.基于低温液氮实验的不同煤体结构煤的孔隙特征及其对瓦斯突出影响[J].煤炭学报,2011,36(4):609-614.
[6]邹俊鹏,陈卫忠,杨典森,等.基于SEM的珲春低阶煤微观结构特征研究[J].岩石力学与工程学报,2016,35(9):1805-1814.
[7]薛光武,刘鸿福,要惠芳,等.韩城地区构造煤类型与孔隙特征[J].煤炭学报,2011,36(11):1845-1851.
[8]陈贞龙,汤达祯,许浩,等.黔西滇东地区煤层气储层孔隙系统与可采性[J].煤炭学报,2010,35(S1):158-163.
[9]赵兴龙,汤达祯,许浩,等.煤变质作用对煤储层孔隙系统发育的影响[J].煤炭学报,2010,35(9):1506-1511.
[10]曹涛涛,宋之光,罗厚勇,等.煤、油页岩和页岩微观孔隙差异及其储集机理[J].天然气地球科学,2015,26(11):2208-2218.
[11]刘培生,马晓明.多孔材料检测方法[M].北京:冶金工业出版社,2006.
[12]中国科学院过程工程研究所,北京市理化分析测试中心.GB/T 21650.1—2008压汞法和气体吸附法测定固体材料孔径分布和孔隙度[S].北京:中国标准出版社,2008.
[13]顾熠凡,王兆丰,戚灵灵.基于压汞法的软、硬煤孔隙结构差异性研究[J].煤炭科学技术,2016,44(4):64-67.
[14]张先伟,孔令伟.利用扫描电镜、压汞法、氮气吸附法评价近海黏土孔隙特征[J].岩土力学,2013,34(S2):134-142.
[15]程庆迎,黄炳香,李增华.煤的孔隙和裂隙研究现状[J].煤炭工程,2011(12):91-93.
[16]吉登高,王祖讷,张丽娟,等.粉煤成型原料粒度组成的实验研究[J].煤炭学报,2005(1):100-103.
[17]陈光进,孙长宇,马庆兰.气体水合物科学与技术[M].北京:化学工业出版社,2007.
[18]刘昌龄,业渝光,孟庆国.显微激光拉曼光谱测定甲烷水合物的水合指数[J].光谱学与光谱分析,2010,30(4):963-966.