Heterogeneity and influencing factors of pore structure in different coal ranks
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摘要:
为研究不同煤级煤孔隙结构的非均质性及其影响因素，通过低温氮气和二氧化碳吸附实验测试了8组不同煤级煤样孔隙结构，利用Frenkel-Halsey-Hill（FHH）模型计算了不同煤级煤分形维数，并分析了分形维数在煤化作用中的演化规律；结合煤样煤质特征，研究了煤质对于孔隙结构分形特征的影响。研究结果表明：① 在煤化作用过程中，煤中水分和挥发分逐渐减少，固定碳含量逐渐增加，而灰分产率与煤化作用并没有显著的相关性；② 煤中介孔参数与成熟度不具有明显的相关性，而微孔参数随着成熟度的增大呈现出“U”型变化，即开始逐渐减小，在第2次煤化跃迁后逐渐增大；③ 不同煤级煤分形维数D1、D2和Dc普遍与煤化作用密切相关，其中微孔分形维数Dc相关性最高（R2=
0.7092 ），这主要与热演化过程中形成了大量次生孔隙有关；④ 分形维数D1、D2和Dc与水分含量和灰分产率之间不存在明显的相关性，而与挥发分和固定碳含量之间存在相反的相关性，这与煤化作用过程中煤质的变化密切相关。本次研究可以为不同煤级煤层气资源评价提供一定的参考依据。Abstract:To study the pore structure heterogeneity and influencing factors of different coal ranks, 8 coal samples with different coal ranks were tested through low-temperature N2 and CO2 adsorption experiments. The fractal dimension of different coal ranks was calculated using the Frenkel-Halsey-Hill (FHH) model, the evolution law of fractal dimension in coalification was analyzed and the influence of coal quality on the fractal characteristics of pore structure was explored based on the characteristics of coal quality. The results show that: ① In the coalification process, the moisture and volatile matter in coal gradually decrease, and the fixed carbon content gradually increases, while the ash yield has no significant correlation with coalification. ② The mesoporous parameters of coal have no significant correlation with maturity, while the micropore parameters exhibit a U-shaped change trend with the increase of maturity, that is the microporous parameters first gradually decrease and then gradually increase after the second coalification jump. ③ The fractal dimensions D1, D2 and Dc of different coal ranks are generally closely related to coalification, with the highest correlation observed in the microporous fractal dimension Dc (R2=
0.7092 ), which is mainly related to the formation of abundant secondary pores during the thermal evolution process. ④ The fractal dimensions D1, D2 and Dc have no significant correlation with moisture content and ash yield, while have a negative correlation with volatile matter and fixed carbon content, which is closely related to the change in coal quality during coalification. The study result can provide a significant reference basis for the evaluation of coalbed methane resources in different coal ranks.-
Keywords:
- different coal ranks /
- pore structure /
- heterogeneity /
- coalification /
- influencing factors
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图 2 不同煤级煤样氮气吸附‒脱附曲线
Figure 2. Nitrogen adsorption-desorption curves of different coal rank samples
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图 3 不同煤级煤样二氧化碳吸附曲线
Figure 3. Carbon dioxide adsorption curves of different coal rank samples
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图 4 水分、灰分、挥发分产率及固定碳含量与Ro的关系
Figure 4. Relationship between Ro with moisture content, ash yield rate, volatile matter yield and fixed carbon content
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图 5 BET比表面积、DFT比表面积及DFT孔容与Ro的关系
Figure 5. Relationship between BET surface area, DFT specific surface area, and DFT pore volume with Ro
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图 7 水分、灰分、挥发分产率及固定碳含量与分形维数的关系
Figure 7. Relationship between moisture content, ash yield rate, volatile matter yield and fixed carbon content with fractal dimensions
表 1 实验煤样基本参数
Table 1 Basic parameters of coal samples
编号 采样位置 样品编号 镜质体反射率Ro/% 工业分析/% 显微组分分析/% Mad Aad Vdaf FCad V I E 1 内蒙古海拉尔 HLE‒2 0.24 15.83 11.20 42.73 30.24 52.5 45.3 2.2 2 内蒙古海拉尔 HLE‒1 0.27 12.84 10.90 39.07 37.19 75.0 23.0 2.0 3 内蒙古鄂尔多斯 EER‒1 0.32 10.78 4.80 36.64 47.78 54.6 41.7 3.7 4 内蒙古鄂尔多斯 EER‒2 0.43 8.33 4.15 34.10 53.42 44.2 53.4 2.4 5 内蒙古乌海 WH‒1 0.67 1.91 5.67 33.06 59.36 78.3 17.9 3.8 6 内蒙古乌海 WH‒2 1.02 0.33 13.50 30.67 55.50 62.3 34.8 2.9 7 山西古交 GJ‒1 1.47 0.58 10.33 19.34 69.75 61.6 33.5 4.9 8 山西古交 GJ‒2 1.52 0.52 10.68 19.19 70.00 61.3 34.7 4.0 9 山西阳泉 YQ‒1 2.77 2.19 13.09 8.21 76.51 64.0 34.0 2.0 10 山西晋城 JC‒1 3.00 2.86 14.73 10.14 72.27 67.2 28.8 3.9 注：Mad为空气干燥基水分；Aad为空气干燥基灰分；Vdaf为干燥无灰基挥发分；FCad为空气干燥基固定碳；V为镜质组；I为惰质组；E为壳质组。 
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表 2 液氮、二氧化碳吸附实验结果
Table 2 Experimental results of nitrogen and carbon dioxide adsorption
样品编号 镜质体反射率Ro/% N2吸附实验 CO2吸附实验 平均孔径/nm BET比表面积/（m2·g‒1） BJH孔容/（cm3·g‒1） DFT比表面积/（m2·g‒1） DFT孔容/（cm3·g‒1） HLE‒1 0.24 25.51 1.91 0.012 5 122.577 0.0243 9HLE‒2 0.27 28.58 1.35 0.009 8 149.881 0.0296 4EER‒1 0.32 16.98 0.88 0.003 7 171.037 0.0334 7WH‒1 0.67 14.03 0.45 0.001 5 116.089 0.0222 1WH‒2 1.02 19.13 0.35 0.001 6 74.728 0.0135 0GJ‒2 1.52 14.24 0.13 0.000 6 77.119 0.0134 5YQ‒1 2.77 4.80 1.88 0.001 7 183.142 0.0389 1JC‒1 3.00 10.54 2.13 0.005 2 182.990 0.0398 5
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表 3 基于液氮和二氧化碳吸附实验获得的分形维数
Table 3 Fractal dimension obtained from nitrogen and carbon dioxide adsorption experiments
样品编号 镜质体反射率Ro/% D1
P/P0<0.5D2
P/P0>0.5Dc HLE‒1 0.24 2.4656 2.4026 2.7252 HLE‒2 0.27 2.3577 2.3614 2.7344 EER‒1 0.32 2.6810 2.4676 2.7181 WH‒1 0.67 2.6970 2.4477 2.7634 WH‒2 1.02 2.7392 2.4691 2.7816 GJ‒2 1.52 2.9780 2.2643 2.8360 YQ‒1 2.77 2.9014 2.7042 2.7454 JC‒1 3.00 2.7558 2.5977 2.8285
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