不同煤阶煤中水分自发渗吸特性试验研究

doi:10.16265/j.cnki.issn1003-3033.2025.08.1322

摘要/Abstract

摘要： 为了解不同煤阶煤自发渗吸过程中水分运移特征,以蒙泰满来梁矿、九里山矿、天地王坡矿、平顶山十矿煤样为研究对象,利用低场核磁共振(NMR)试验系统测试煤样渗吸过程中水分在不同时刻的T₂谱,结合煤样中水分质量变化,探究煤样在渗吸过程中水分随时间和空间的变化特征。结果表明:低阶煤润湿性较高阶煤和中阶煤好,相同试验条件下,低阶煤的渗吸量最大,其次是高阶煤,中阶煤的渗吸量最小;根据煤样渗吸过程中水分随时间变化情况,可将煤样渗吸过程划分为3个阶段:渗吸初期、渗吸中期和渗吸后期。渗吸初期,低阶煤对水力作用的敏感程度高于高阶煤和中阶煤,低阶煤渗吸速度最大,其次是中阶煤,高阶煤的渗吸速度最小。渗吸中、后期,高阶煤的渗吸速度较中阶煤大;在渗吸过程中,微小孔/中孔范围内由于毛细管力作用,水分会从孔径较小的孔隙向孔径较大的孔隙运移,运移过程中,水分在低阶煤中受到的阻力小于在高阶煤中受到的阻力。

关键词: 不同煤阶, 煤中水分, 自发渗吸, 润湿效果, 低场核磁共振(NMR), 毛细管力

Abstract:

In order to understand the characteristics of water transport during spontaneous infiltration and absorption of coal of different rank, coal samples from Mengtai Manlailiang mine, Jiulishan mine, Tiandiwangpo mine, and Pingdingshan No.10 mine were taken as the research objects, The T₂ spectrum of water in the coal sample at different times during the imbibition process was measured by using the low-field NMR experimental system, and the variation of water in the coal sample with time and space during the imbibition process was explored based on the change of water quality in the coal sample. The results show that the wettability of low-rank coal is better than that of high-rank coal and medium-rank coal, and the imbibition capacity of low-rank coal is the largest under the same experimental conditions, followed by high-rank coal, and the imbibition capacity of medium-rank coal is the smallest. According to the change of water in the process of coal sample imbibition with time, the coal sample imbibition process can be divided into three stages: the initial stage of imbibition, the middle stage of imbibition and the late stage of imbibition. In the early stage of imbibition, the sensitivity of low-rank coal to hydraulic action is higher than that of high-rank coal and medium-rank coal, and the imbibition velocity of low-rank coal is the largest, followed by medium-rank coal, and the imbibition velocity of high-rank coal is the smallest. In the middle and late stages of imbibition, the imbibition rate of high-rank coal is larger than that of medium-rank coal. In the process of imbibition and sorption, water will be transported from the pores with smaller pore size to the pores with larger pore size due to capillary force in the micropores/mesopores of the same magnitude, and the resistance of water in the lower rank coal is less than that in the higher rank coal.

Key words: different coal ranks, moisture in coal, spontaneous imbibition, wetting effect, low-field nuclear magnetic resonance(NMR), capillary force

中图分类号:

X936

杨明, 江舒纬, 徐靖, 周子恒, 王明洋, 高建良. 不同煤阶煤中水分自发渗吸特性试验研究[J]. 中国安全科学学报, 2025, 35(8): 110-117.

YANG Ming, JIANG Shuwei, XU Jing, ZHOU Ziheng, WANG Mingyang, GAO Jianliang. Experimental study on spontaneous water infiltration and absorption characteristics in different coal grades[J]. China Safety Science Journal, 2025, 35(8): 110-117.

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煤样	工业分析				最大镜质组反射率/%	接触角/(°)
煤样	M_ad/%	A_ad/%	V_daf/%	FC_ad/%	最大镜质组反射率/%	接触角/(°)
G1	0.90	14.92	9.76	75.96	2.77	56.1
G2	1.46	13.65	7.53	80.82	3.09	58.2
Z1	0.69	9.50	23.45	68.75	1.41	77.2
D1	10.86	5.44	27.49	60.69	0.42	41.2

渗吸时间	测样时间间隔
0~60	15
60~240	30
240~2 880	240
2 880~7 200	360
7 200~12 000	480
12 000~13 440	1 440