摘要
为了研究中低煤阶煤孔隙特征及其对瓦斯放散特性的影响,对采集的中低煤阶长焰煤、气煤、焦煤和1/3焦煤4个煤类共计14组样品进行了煤工业分析、煤岩分析、液氮吸附和瓦斯放散初速度测试,结合分形理论研究了中低煤阶煤比表面积、孔容和孔隙分布特征及其瓦斯放散特性。结果表明:中低煤阶煤孔比表面积孔径分布主要以小孔和微孔为主,孔隙形态为以一端开口的孔为主,含有少量两端开口的孔,部分样品含有少量墨水瓶形孔。中低煤阶煤孔隙具有较好的分形特征,孔比表面积、孔容与分形维数具有明显的对数关系。中低阶煤瓦斯放散初速度较小,瓦斯放散初速度随着分形维数增大而减小,随着平均孔径的增大而增大。随着各孔径段孔容积、孔比表面积含量增加瓦斯放散初速度均呈负对数减小趋势,各孔径段比例和煤孔隙形态类型的细微变化对瓦斯放散初速度的影响不大。
In order to study the pore characteristics of medium and low rank coal and its influence on gas emission characteristics,14 samples of 4 coal types in medium and low coal rank were collected. Through the coal industry analysis, coal and rock analysis, liquid nitrogen adsorption and gas emission initial velocity test, combined with fractal theory, the specific surface area,pore volume and pore distribution characteristics and gas dissipation characteristics of medium and low rank coal were studied.The results show that the pore distribution of pore specific surface area of medium and low rank coal is mainly small and micropore, and the pore morphology is mainly open at one end, with a small number of open at both ends, and some samples contain a small number of ink bottle-shaped pores. The coal pores of medium and low rank coal have good fractal characteristics, and the pore specific surface area, pore volume and fractal dimension have obvious logarithmic relationship. The initial velocity of gas release in medium and low rank coal is small, and the initial velocity of gas dissipation decreases with the increase of fractal dimension, and increases with the increase of average pore size. With the increase of pore volume and specific surface area of each pore size, the initial velocity of gas dissipation decreases in a negative logarithm. The slight change of the ratio of each pore size and the shape of coal pore morphology has little effect on the initial velocity of gas dissipation.
作者
贾雪梅
蔺亚兵
马东民
JIA Xuemei;LIN Yabing;MA Dongmin(Shaanxi Energy Institute,Xianyang 712000,China;Shaanxi Coalfield Geological Exploration Research Institute Co.,Ltd.,Xi'an 710021,China;School of Resource and Geosciences,China University of Mining and Technology,Xuzhou 221008 China;College of Geology and Environment^Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《煤矿安全》
CAS
北大核心
2019年第11期169-174,共6页
Safety in Coal Mines
基金
陕西省科技厅工业科技攻关资助项目(2018GY-094)