采矿与安全工程学报2017，Vol.34Issue(1)：170-176,7.DOI:10.13545/j.cnki.jmse.2017.01.026
黔西北构造煤与原生结构煤孔隙结构对吸解特性影响实验研究
The experimental research on the impact of pore structure in tectonic coal and primary structure coal on gas adsorption-desorption characteristics in northwestern Guizhou
摘要
Abstract
With the tectonic coal and primary structure coal of Qinglong coal mine and Xiaotun coal mine in the northwest of Guizhou as the research objects,the liquid nitrogen adsorption isothermal curves of respective coal samples from the two coal mines were acquired with the automatic nitrogen adsorption instrument.Through the method of BJH,the maps of pore diameter distribution of the coal sample were drawn respectively,then the impact of pore structure in tectonic coal and primary structure coal on gas adsorption-desorption characteristics was compared.The results have shown that the BET specific surface area and pore capacity of tectonic coal are bigger than that of primary structure coal,while its pore diameter is smaller than primary structure coal;under the same pressure,the differ-ence between gas adsorption and desorption in tectonic coal is significantly larger than that in primary structure coal;both value and speed of gas adsorption and desorption in tectonic coal are bigger than that in in primary structure coal;the adsorption isotherms of either tectonic coal or primary structure coal take identical characters with type Ⅱ adsorption isotherm;when the relative pressure is approxi-mately 0.4～0.5,a significant inflection point appears in adsorption-desorption curve of both samples;both samples incline to delay in their adsorption and desorption,and it is hard for the stripping of tec-tonic to reach the starting point of adsorption,and within the coal structure of tectonic coal there are more "ink bottle" type microporous than in the primary structure coal;tectonic coal's pore sizes are around 2～3 nm,while primary structure coal's pore sizes are around 4 nm;the desorption space of coal in the northwest of Guizhou is mainly on the micropore of more than 3 nm to 4 nm.关键词
构造煤/原生结构煤/孔隙结构/吸解特性/实验研究Key words
tectonic coal/primary structure pore coal/coal pore structure/characteristics of ad-sorption-desorption/experimental research分类
矿业与冶金引用本文复制引用
李希建,沈仲辉,刘钰,许石青..黔西北构造煤与原生结构煤孔隙结构对吸解特性影响实验研究[J].采矿与安全工程学报,2017,34(1):170-176,7.基金项目
贵州省重大应用基础研究项目(黔科合JZ字[2014]2005) （黔科合JZ字[2014]2005）
贵州省教育厅项目(黔教合KY字(2013)112) （黔教合KY字(2013）
国家自然科学基金项目(51264004,51574093) （51264004,51574093）
