摘要
贵州地区复杂的地质构造以及瓦斯等灾害严重制约了煤炭行业的发展。为了定量分析与表征贵州地区无烟煤的孔隙特征,以贵州省具有无烟煤代表特征的发耳煤矿5-2煤层为研究对象,采用低温氮气吸附和低场核磁共振等技术手段,对煤体的孔隙特征进行了深入分析。同时,利用分形理论对低温氮气吸附和低场核磁共振两种测试方法的优缺点进行了对比分析。研究结果表明,发耳无烟煤样主要由狭缝和窄缝状孔隙组成,微孔发育较为丰富,但与中大孔的连通性较差。采用合适的煤体改造,可以有效提高孔隙连通性。在低场核磁共振测试中,该技术能够较好地表征大孔的复杂性和非均质性;而低温氮气吸附测试虽然受到一定方法局限性的制约,但能够很好地表征微小孔的复杂性和非均质性。研究旨在为贵州地区无烟煤资源的高效安全开采提供一定的理论参考,有助于推动该地区煤炭行业的可持续发展。
The intricate geological structure of Guizhou,coupled with disasters like gas explosions has severely hampered the development of the coal industry in the region.To quantitatively analyze and characterize pore features of anthracite coal in Guizhou region,taking the 5-2 coal seam of the Faer Coal Mine in Guizhou Province,which has representative characteristics of anthracite coal,using techniques such as low-temperature nitrogen adsorption and low-field nuclear magnetic resonance,a thorough analysis of the pore features of the coal bodies was conducted.At the same time,the fractal theory was used to compare and analyze the advantages and disadvantages of the low-temperature nitrogen adsorption and low-field nuclear magnetic resonance testing methods.The research result shows that Faer anthracite coal samples are primarily composed of slit and narrow-slit pores,with abundant micropores but poor connectivity to medium and large pores.By adopting appropriate coal body modification techniques,we can effectively enhance pore connectivity.In low-field nuclear magnetic resonance testing,this technology can effectively characterize the complexity and heterogeneity of large pores.While low-temperature nitrogen adsorption test is limited by certain methodological constraints,it can well characterize the complexity and heterogeneity of micro pores.This study aims to provide theoretical references for the efficient and safe mining of anthracite coal resources in Guizhou region,contributing to the sustainable development of the coal industry in the region.
作者
郭隆鑫
李伟
郑义
段思恭
王耀强
Guo Longxin;Li Wei;Zheng Yi;Duan Sigong;Wang Yaoqiang(Coal Technology Tong'an(Beijing)Intelligent Control Technology Co.,Ltd.,Beijing 100013,China;Mine Intelligent Ventilation Division,China Coal Research Institute,Beijing 100013,China;Beijing Engineering and Research Center of Mine Safe,Beijing 100013,China;National Key Laboratory of Intelligent Mining and Rock Strata Control,Beijing 100013,China)
出处
《能源与环保》
2024年第10期266-271,279,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
煤科院科技发展基金项目(技术创新基金Ⅰ类)(2023CX-Ⅰ-16,2023CX-Ⅰ-15)。
关键词
无烟煤
孔隙结构
粗糙度
分形维数
anthracite coal
pore structure
roughness
fractal dimension
