摘要
为了研究不同粒度条件下型煤孔隙结构特征、瓦斯吸附特性规律及其相关关系,选取新疆矿井中煤阶煤样,制取4种粒度的型煤煤样,通过核磁共振(NMR)分析实验和高压容量法瓦斯等温吸附实验,测定不同粒度型煤的弛豫时间T 2谱和瓦斯吸附等温线。研究结果表明:不同粒度型煤的弛豫时间T 2谱均表现出微孔、中大孔2个峰,且弛豫时间主要集中在1.0~100.0 ms;中大孔和总孔谱峰面积与型煤粒度呈负相关关系,微孔谱峰面积与粒度呈正相关关系;在相同吸附条件下,型煤平均粒度越小,吸附瓦斯总量越大,瓦斯吸附常数a、b值及瓦斯吸附饱和度X均与粒度大小呈负相关关系;随着微孔谱峰面积的增加,瓦斯的吸附速率增加,而瓦斯吸附能力在一定范围内增大,达到一定值后趋于平缓。
In order to study the pore structure characteristics and gas adsorption characteristics of coal briquettes as well as their correlations under different particle sizes,the middle rank coal samples of Xinjiang Mine were selected to prepare coal briquette samples of four sizes.The samples were tested by NMR and high pressure gas isothermal adsorption capacity,to determine the T 2 spectrum and gas adsorption isotherm of different particle sizes.The results show that the T 2 spectrum signals of different particle sizes show two peaks of micropores and mesopores,the relaxation time is mainly concentrated from 1.0 ms to 100.0 ms;the peak area of medium and large pores is negatively correlated with the particle size,the peak area of micropores is positively correlated with the particle size;under the same adsorption conditions,the smaller the average particle size of briquette is,the larger the total amount of adsorbed gas is,and the gas adsorption constants a and b and the gas adsorption saturation X are negatively correlated with the particle size;as the peak area of micropores increases,the adsorption rate of gas increases,and the gas adsorption capacity increases within a certain range,then tends to be gentle after reaching a certain value.
作者
李树刚
张晓宇
严敏
白杨
LI Shugang;ZHANG Xiaoyu;YAN Min;BAI Yang(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an 710054,China)
出处
《矿业安全与环保》
北大核心
2019年第4期8-12,16,共6页
Mining Safety & Environmental Protection
基金
国家自然科学基金重点项目(51734007)
国家自然科学基金项目(51674192,51604220)
关键词
型煤
粒度
孔隙
核磁共振
等温吸附
briquette
particle size
pore
NMR
isothermal adsorption
