Effects of the Degree of Coal Metamorphism on CH4 Adsorption Behaviors

doi:10.11885/j.issn.1674-5086.2017.05.29.02

Abstract

Abstract: Coals with varying degrees of metamorphism (fat, coking, lean, and meagre coals and anthracite) were studied using macromolecular structural models and grand canonical Monte Carlo (GCMC) method, in order to analyze how the degree of coal metamorphism affects their CH₄ adsorption. The results indicate that anthracite has the highest capacity for CH₄ adsorption, followed by meagre coal, lean coal, coking coal, and finally fat coal. Regardless of the degree of metamorphism, the adsorption of CH₄ in coals is mediated by van der Waals and electrostatic interactions, and the stability of their adsorption states varies very little. The different coal samples show a linear decrease of CH₄ adsorption with increasing temperature, and the magnitudes of change are similar. CH₄ adsorption also decreases linearly with increasing water content, and this effect is more pronounced for lower degrees of metamorphism. When CH₄ and H₂O are both present, the adsorption of CH₄ on the coals becomes extremely small, and the adsorption process no longer fits the characteristics of isothermal adsorption described by the Langmuir adsorption model. Therefore, the gas content of coal is related to its degree of metamorphism. The water content also strongly affects the gas content, especially at lower degrees of metamorphism. It was also found that the effects of temperature on coal gas content are virtually independent of the degree of metamorphism.

Key words: degree of metamorphism, coal, macromolecular structural models, CH₄, Monte Carlo methods, adsorption

CLC Number:

TE311
TD712

TANG Jupeng, MA Yuan, TIAN Hunan, SUN Shengjie. Effects of the Degree of Coal Metamorphism on CH₄ Adsorption Behaviors[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 143-150.

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http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2018/V40/I4/143

References

[1] 钱伯章,朱建芳. 世界非常规天然气资源和利用进展[J]. 天然气与石油, 2007, 25(2):28-32. doi:10.-3969/j.issn.1006-5539.2007.02.009 QIAN Bozhang, ZHU Jianfang. Non regular natural gas resources in the world and utilization progress[J]. Natural Gas and Oil, 2007, 25(2):28-32. doi:10.3969/j.issn.1006-5539.2007.02.009
[2] 郭大立,贡玉军,李曙光,等.煤层气排采工艺技术研究和展望[J]. 西南石油大学学报(自然科学版), 2012, 34(2):91-98. doi:10.3863/j.issn.1674-5086.2012.02.-013 GUO Dali, GONG Yujun, LI Shuguang, et al. Research and prospect about the CBM drainage technology[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2012, 34(2):91-98. doi:10.3863/j.issn.-1674-5086.2012.02.013
[3] 王俊峰,张力,赵东. 温度及含水率对切削原煤吸附瓦斯特性的影响[J]. 煤炭学报,2011,36(12):2086-2091. doi:10.13225/j.cnki.jccs.2011.12.025 WANG Junfeng, ZHANG Li, ZHAO Dong. Effect of temperature and moisture on raw coal adsorption characteristics[J]. Journal of China Coal Society, 2011, 36(12):2086-2091. doi:10.13225/j.cnki.jccs.2011.12.025
[4] 降文萍,崔永君,张群,等. 不同变质程度煤表面与甲烷相互作用的量子化学研究[J]. 煤炭学报, 2007, 32(3):292-295. doi:10.3321/j.issn:0253-9993.2007.03.016 JIANG Wenping, CUI Yongjun, ZHANG Qun, et al. The quantum chemical study on different rank coals surface interacting with methane[J]. Journal of China Coal Society, 2007, 32(3):292-295. doi:10.3321/j.issn:0253-9993.2007.03.016
[5] AN Fenghua, CHENG Yuanping, WU Dongmei, et al. The effect of small micropores on methane adsorption of coals from northern China[J]. Adsorption, 2012, 19(1):83-90. doi:10.1007/s10450-012-9421-3
[6] 陈向军,刘军,王林,等. 不同变质程度煤的孔径分布及其对吸附常数的影响[J]. 煤炭学报, 2013, 38(2):294-300. doi:10.13225/j.cnki.jccs.2013.02.025 CHEN Xiangjun, LIU Jun, WANG Lin, et al. Influence of pore size distribution of different metamorphic grade of coal on adsorption constant[J]. Journal of China Coal Society, 2013, 38(2):294-300. doi:10.13225/j.cnki.jccs.-2013.02.025
[7] 苏现波,陈润,林晓英,等. 吸附势理论在煤层气吸附/解吸中的应用[J]. 地质学报, 2008, 82(10):1382-1389. doi:10.3321/j.issn:0001-5717.2008.10.012 SU Xianbo, CHEN Run, LIN Xiaoying, et al. Application of adsorption potential theory in the fractionation of coalbed gas during the process of adsorption/desorption[J]. Acta GeoloGica Sinica, 2008, 82(10):1382-1389. doi:10.3321/j.issn:0001-5717.2008.10.012
[8] 崔永君,张庆玲,杨锡禄. 不同煤的吸附性能及等量吸附热的变化规律[J]. 天然气工业, 2003, 23(4):130-131. doi:10.3321/j.issn:1000-0976.2003.04.042
[9] 荆雯. 甲烷在构造煤中吸附和扩散的分子模拟[D]. 太原:太原理工大学, 2006. JING Wen. Molecular simulation of adsorption and diffusion of methane in deformed coal[D]. Taiyuan:Taiyuan University of Technology, 2006.
[10] 曲星武,王金城. 煤的X射线分析[J]. 煤田地质与勘探, 1980(2):36-43.
[11] MOSHER K, HE Jiajun, LIU Yangyang, et al. Molecular simulation of methane adsorption in micro-and mesoporous carbons with applications to coal and gas shale systems[J]. International Journal of Coal Geology, 2013, 109-110(2):36-44. doi:10.1016/j.coal.2013.01.001
[12] BROCHARD L, VANDAMME M, PELLENQ R J, et al. Adsorption-induced deformation of microporous materials:Coal swelling induced by CO₂-CH₄ competitive adsorption[J]. Langmuir, 2012, 28(5):2659-2670. doi:10.1021/la204072d
[13] LIU Yangyang, WILCOX J. Effects of surface heterogeneity on the adsorption of CO₂ in microporous carbons[J]. Environ Science & Technology, 2012, 46(3):1940-1947. doi:10.1021/es204071g
[14] ASTASHOV A V, BELYI A A, BUNIN A V. Quasiequilibrium swelling and structural parameters of coals[J].Fuel, 2008, 87(15-16):3455-3461. doi:10.1016/j.fuel.-2008.04.027
[15] 孙晓岩,李建伟,李英霞,等. 苯与丙烯在β分子筛上吸附行为的蒙特卡罗研究[J]. 化学学报, 2008, 66(15):1810-1814. doi:10.3321/j.issn:0567-7351.2008.15.008 SUN Xiaoyan, LI Jianwei, LI Yingxia, et al. Adsorption of benzene and propene in β zeolite by grand canonical Monte Carlo simulation[J]. Acta Chimica Sinica, 2008, 66(15):1810-1814. doi:10.3321/j.issn:0567-7351.2008.-15.008
[16] YANG Qingyuan, ZHONG Chongli. Molecular simulation of carbon dioxide/methane/hydrogen mixture adsorption in metal-organic frameworks[J]. Journal of Physical Chemistry B, 2006, 110(36):17776-17783. doi:10.1021/-jp062723w
[17] 胡爱梅,陈东,张遂安,等. 煤层气开采基础理论[M]. 北京:科学出版社, 2015:13-15.
[18] 张天军,许鸿杰,李树刚,等. 温度对煤吸附性能的影响[J]. 煤炭学报,2009,34(6):802-805. doi:10.13225/-j.cnki.jccs.2009.06.001 ZHANG Tianjun, XU Hongjie, LI Shugang, et al. The effect of temperature on the adsorbing capability of coal[J]. Journal of China Coal Society, 2009, 34(6):802-805. doi:10.13225/j.cnki.jccs.2009.06.001
[19] 冯艳艳,储伟,孙文晶. 储层温度下甲烷的吸附特征[J]. 煤炭学报, 2012, 37(9):1488-1492. doi:10.13225/j.-cnki.jccs.2012.09.018 FENG Yanyan, CHU Wei, SUN Wenjing. Adsorption characteristics of methane on coal under reservoir temperatures[J]. Journal of China Coal Society, 2012, 37(9):1488-1492. doi:10.13225/j.cnki.jccs.2012.09.018
[20] 谢振华,陈绍杰. 水分及温度对煤吸附甲烷的影响[J]. 北京科技大学学报, 2007, 29(增2):42-44. doi:10.-13374/j.issn1001-053x.2007.s2.078 XIE Zhenhua, CHEN Shaojie. Effect of moisture and temperature to CH₄ adsorption of coal[J]. Journal of University of Science and Technology Beijing, 2007, 29(S2):42-44. doi:10.13374/j.issn1001-053x.2007.s2.078
[21] 钟玲文,郑玉柱,员争荣,等. 煤在温度和压力综合影响下的吸附性能及气含量预测[J]. 煤炭学报, 2002, 27(6):581-585. doi:10.13225/j.cnki.jccs.2002.06.005 ZHONG Lingwen, ZHENG Yuzhu, YUAN Zhengrong, et al. The adsorption capability of coal under integrated influence of temperature and pressure and predicted of content quantity of coal bed gas[J]. Journal of China Coal Society, 2002, 27(6):581-585. doi:10.13225/j.cnki.jccs.2002.06.-005
[22] SNYDER G T, RIESE W C, FRANKS S, et al. Origin and history of waters associated with coalbed methane:¹²⁹I, ³⁶Cl, and stable isotope results from the Fruitland Formation, CO and NM[J]. Geochimica Et Cosmochimica Acta, 2003, 67(23):4529-4544. doi:10.1016/S0016-7037(03)00380-6
[23] 林海飞,姚飞,李树刚,等. 温度及含水量对煤吸附甲烷特性影响的实验研究[J]. 煤矿开采, 2014, 19(3):9-12. doi:10.13532/j.cnki.cn11-3677/td.2014.03.003 LIN Haifei, YAO Fei, LI Shugang, et al. Experiment of coal's temperature and water content influencing methane absorption quality[J]. Coal Mining Technology, 2014, 19(3):9-12. doi:10.13532/j.cnki.cn11-3677/td.2014.03.-003
[24] GORDILLO M C, MARTI J. Molecular dynamics description of a layer of water molecules on a hydrophobic surface[J]. Journal of Chemical Physics, 2002, 117(7):3425-3430. doi:10.1063/1.1495843

Effects of the Degree of Coal Metamorphism on CH₄ Adsorption Behaviors

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