高阶煤润湿过程中水分运移的低场核磁共振试验

doi:10.16265/j.cnki.issn1003-3033.2023.10.0009

中国安全科学学报 ›› 2023, Vol. 33 ›› Issue (10): 46-52.doi: 10.16265/j.cnki.issn1003-3033.2023.10.0009

高阶煤润湿过程中水分运移的低场核磁共振试验

高建良¹^,²^,³(), 关孟瑶¹(), 张琛¹, 王德坤¹, 任镜璋¹

¹ 河南理工大学安全科学与工程学院,河南焦作 454003
² 煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作 454003
³ 河南理工大学河南省瓦斯地质与瓦斯治理实验室-省部共建国家重点实验室培育基地,河南焦作 454003

收稿日期:2023-04-03 修回日期:2023-07-14 出版日期:2023-10-28
作者简介:
高建良 (1963—),男,河北望都人,博士,教授,博士生导师,主要从事安全技术及工程、矿井通风、热环境控制理论与技术研究。E-mail:gao@hpu.edu.cn。
关孟瑶 (1997—),女,河南驻马店人,硕士研究生,研究方向为瓦斯地质与瓦斯治理。E-mail: guanmy97@163.com。
基金资助:
国家自然科学基金资助(52274186)

Low-field nuclear magnetic resonance tests characterizing moisture transport during wetting of high-rank coal

GAO Jianliang¹^,²^,³(), GUAN Mengyao¹(), ZHANG Chen¹, WANG Dekun¹, REN Jingzhang¹

¹ School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China
² Henan Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo Henan 454003, China
³ Henan Provincial Key Laboratory of Gas Geology and Gas Control-provincial and Ministry of State Key Laboratory Breeding Base, Henan Polytechnic University, Jiaozuo Henan 454003, China

Received:2023-04-03 Revised:2023-07-14 Published:2023-10-28

摘要/Abstract

摘要：

为深入了解煤层注水过程中水分在高阶煤煤体中的运移特征,以焦作中马村矿高阶煤为研究对象,利用低场核磁共振(LNMR)设备,测试煤样在负压浸水试验、等温浸润试验过程中不同浸水时间时的核磁谱图,结合煤样负压浸水过程的质量变化,获得制备饱水煤样所需的试验条件;结合煤样等温浸润过程质量变化,从微观层面定量分析煤样润湿过程中水分进入煤体的分布特征、煤样含水率和含水饱和度的变化规律。结果表明:水分在毛细管力作用下,可以浸润到煤体的最小孔径对应的核磁弛豫时间为0.014 ms;水分按照较大孔→小孔→微孔的路径依次进入到煤体中,按照微孔→小孔→较大孔的路径依次达到饱和状态,试验煤样在相同的润湿时间时,虽然含水率不同,但整体含水饱和度几乎一致,且煤样整体含水饱和度与润湿时间的0.5次方之间存在定量关系。

关键词: 高阶煤, 润湿过程, 运移特征, 低场核磁共振(LNMR), 含水饱和度

Abstract:

In order to deeply understand the water transport characterizing in the coal body of high-rank coal during the process of water injection in coal seams, we took the high-rank coal of Jiaozuo Zhongmacun mine as the research object, and used the LNMR equipment to test the NMR spectra of the coal samples at different immersion times in the process of negative-pressure immersion test and isothermal wettability test. Combined with the quality change of the coal samples during the process of negative-pressure immersion, the experimental conditions necessary for the preparation of the saturated coal samples were obtained. Combined with the mass change of the coal samples during the process of isothermal wettability, from the microscopic level, the distribution characteristic of the water into the coal body, and the changing rules of the moisture content and the degree of saturation of the samples in the course of the wettability process of the coal samples were analyzed quantitatively. The results show that the water can infiltrate into the coal body under the action of capillary force with the minimum pore size corresponding to the NMR relaxation time of 0.014 ms. The water enters into the coal body in the order of larger pore→small pore→micro pore, and reaches the saturation state in the order of micro pore→small pore→larger pore. The overall water content saturation of the tested coal samples is almost the same at the same wetting time, although the water content is different. There is a quantitative relationship between the overall water saturation of the coal sample and the 0.5 power of the wetting time.

Key words: high-rank coal, wetting process transport characteristic, low-field nuclear magnetic resonance (LNMR), water saturation

高建良, 关孟瑶, 张琛, 王德坤, 任镜璋. 高阶煤润湿过程中水分运移的低场核磁共振试验[J]. 中国安全科学学报, 2023, 33(10): 46-52.

GAO Jianliang, GUAN Mengyao, ZHANG Chen, WANG Dekun, REN Jingzhang. Low-field nuclear magnetic resonance tests characterizing moisture transport during wetting of high-rank coal[J]. China Safety Science Journal, 2023, 33(10): 46-52.

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煤样编号	直径/mm	高度/mm	质量m_g/g
ZM₁	25.17	49.87	35.46
ZM₂	25.15	49.95	35.12
ZM₃	25.11	49.87	36.44
ZM₄	25.17	49.96	37.36

水分	灰分	挥发分	镜质组反射率
1.7	15.96	8.31	3.44
黏土类	硫化物	碳酸盐	有机物总量
10.9	0.1	2.0	87.0

时间/h	质量m_i/g
0(干燥)	35.46
负压浸水0.33	35.66
负压浸水1	35.76
负压浸水2	35.85
负压浸水5	35.95
负压浸水7	36.02
负压浸水10	36.10
负压浸水10+常压浸水10	36.25
负压浸水10+常压浸水10+负压浸水4	36.29

浸泡时间/h	质量m_j/g			含水率/%
浸泡时间/h	ZM₂	ZM₃	ZM₄	ZM₂	ZM₃	ZM₄
0	35.12	36.44	37.36	0.00	0.00	0.00
0.083	35.20	36.56	37.44	0.22	0.32	0.22
1	35.32	36.70	37.55	0.57	0.70	0.54
3	35.42	36.79	37.63	0.87	0.94	0.78
7	35.52	36.89	37.72	1.16	1.23	1.04
11	35.60	36.96	37.79	1.37	1.43	1.21
21	35.71	37.07	37.87	1.69	1.73	1.46
24	35.74	37.10	37.90	1.77	1.80	1.54
饱水	35.91	37.29	38.02	2.25	2.32	1.78

高阶煤润湿过程中水分运移的低场核磁共振试验

Low-field nuclear magnetic resonance tests characterizing moisture transport during wetting of high-rank coal

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