瓦斯气体吸附解吸过程煤变形响应特征
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摘要
本文采用实验分析和数值计算相结合的方法,研究吸附解吸过程中煤的轴向应变和环向应变的特征以及体应变-时间模型。结果表明:轴向应变和环向应变呈现各向异性的特征,轴向应变较环向应变快;型煤的轴向应变和环向应变存在吸附膨胀应变增大、吸附平衡、卸压解吸应变下降、解吸平衡几个阶段,而原煤的环向应变存在充气压缩应变下降、吸附膨胀应变增大、吸附平衡、卸压解吸应变下降、解吸平衡几个阶段;在相同压力条件下,型煤比原煤先达到吸附平衡的状态,且型煤和原煤的解吸速率明显比吸附速率大。为了得到更优的体应变-时间模型,对原Langmuir模型进行了改进并利用MATLAB进行拟合。对比其他模型,发现改进的Langmuir模型拟合情况最优。
Experimental analysis and numerical calculation are used to study the characteristics of axial strain and circumferential strain during adsorption and desorption process of coal and the volumetric strain-time model. The results show that the axial strain and circumferential strain are anisotropic,and the axial strain changes faster than the circumferential strain. There are several stages,for example,adsorption swelling strain increase,adsorption equilibrium,pressure relief strain decrease,and desorption equilibrium in the variation of axial strain and circumferential strain of briquette. However,there are several stages in the variation of circumferential strain of raw coal,for instance,gas compression strain reduction,adsorption swelling strain increment,adsorption equilibrium,pressure relief strain reduction,and desorption equilibrium. Under the same pressure,the briquette is reach the adsorption equilibrium state earlier than the raw coal,and the desorption rate of briquette and raw coal are bigger than adsorption rate. Furthermore,the original Langmuir model is improved,and fitted by MATLAB. Compared with other models,the modified Langmuir model is optimal.
Experimental analysis and numerical calculation are used to study the characteristics of axial strain and circumferential strain during adsorption and desorption process of coal and the volumetric strain-time model. The results show that the axial strain and circumferential strain are anisotropic,and the axial strain changes faster than the circumferential strain. There are several stages,for example,adsorption swelling strain increase,adsorption equilibrium,pressure relief strain decrease,and desorption equilibrium in the variation of axial strain and circumferential strain of briquette. However,there are several stages in the variation of circumferential strain of raw coal,for instance,gas compression strain reduction,adsorption swelling strain increment,adsorption equilibrium,pressure relief strain reduction,and desorption equilibrium. Under the same pressure,the briquette is reach the adsorption equilibrium state earlier than the raw coal,and the desorption rate of briquette and raw coal are bigger than adsorption rate. Furthermore,the original Langmuir model is improved,and fitted by MATLAB. Compared with other models,the modified Langmuir model is optimal.
引文
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[17]聂百胜,卢红奇,李祥春,等.煤体吸附-解吸瓦斯变形特征实验研究[J].煤炭学报,2015,40(4):754-759.Nie Baisheng,Lu Hongqi,Li Xiangchun,et al.Experimental study on the characteristic of coal deformation during gas adsorption and desorption process[J].Journal of China Coal Society,2015,40(4):754-759.
[18]张遵国.煤吸附/解吸变形特征及其影响因素研究[D].重庆:重庆大学,2015.
[19]周凯.数学建模竞赛入门与提高[M].杭州:浙江大学出版社,2012.
[20]Khalis M,Mir Y,Hemine J,et al.Extraction of equivalent circuit parameters of solar cell:influence of temperature[J].European Physical Journal Applied Physics,2011,54(1):73-79.
[21]谢宇.回归分析[M].北京:社会科学文献出版社,2013.
[2]Wang C G,Wang C S,Wei M Y,et al.Deformation transition of intact coal induced by gas injection[J].International Journal of Mining Science&Technology,2014,24(6):833-838.
[3]林柏泉,周世宁.含瓦斯煤体变形规律的实验研究[J].中国矿业大学学报,1986(3):9-16.Lin Baiquan,Zhou Shining.Experimental study on deformation law of coal containing gas[J].Journal of China University of Mining&Technology,1986(3):9-16.
[4]Wang G X,Wei X R,Wang K,et al.Sorption-induced swelling/shrinkage and permeability of coal under stressed adsorption/desorption conditions[J].International Journal of Coal Geology,2010,83(1):46-54.
[5]Langmuir I.The constitution and fundamental properties of solids and liquids[J].Journal of the American Chemical Society,1917,38(5):102-105.
[6]赵志根,唐修义.对煤吸附甲烷的Langmuir方程的讨论[J].河南理工大学学报:自然科学版,2002,21(1):1-4.Zhao Zhigen,Tang Xiuyi.Discussion on Langmuir equation of adsorption of methane from coal[J].Journal of Henan Polytechnic University:Natural Science,2002,21(1):1-4.
[7]李毅.原煤、型煤吸附-解吸变形规律对比研究[D].重庆:重庆大学,2012.
[8]聂百胜,李祥春,崔永君.煤体瓦斯运移理论及应用[M].北京:科学出版社,2014.
[9]周世宁.煤层瓦斯赋存与流动理论[M].北京:煤炭工业出版社,1999.
[10]何学秋,王恩元,林海燕.孔隙气体对煤体变形及蚀损作用机理[J].中国矿业大学学报,1996,25(1):6-11.He Xueqiu,Wang Enyuan,Lin Haiyan.The effect of pore gas on coal deformation and erosion[J].Journal of China University of Mining&Technology,1996,25(1):6-11.
[11]George J D S,Barakat M A.The change in effective stress associated with shrinkage from gas desorption in coal[J].International Journal of Coal Geology,2001,45(2/3):105-113.
[12]Brochard L,Vandamme M,Pellenq R J,et al.Adsorption-induced deformation of microporous materials:coal swelling induced by CO2-CH4competitive adsorption[J].Langmuir,2016,28(5):2659-2670.
[13]Liu Z,Feng Z,Zhang Q,et al.Heat and deformation effects of coal during adsorption and desorption of carbon dioxide[J].Journal of Natural Gas Science&Engineering,2015,25:242-252.
[14]Ju Y W,Jiang B,Hou Q L,et al.Behavior and mechanism of the adsorption/desorption of tectonically deformed coals[J].Science Bulletin,2009,54(1):88-94.
[15]刘延保,曹树刚,李勇,等.煤体吸附瓦斯膨胀变形效应的试验研究[J].岩石力学与工程学报,2010,29(12):2484-2491.Liu Yanbao,Cao Shugang,Li Yong,et al.Experimental study on the effect of coal body adsorbed gas expansion deformation[J].Journal of rock mechanics and Engineering,2010,29(12):2484-2491.
[16]张遵国,曹树刚,郭平,等.原煤和型煤吸附-解吸瓦斯变形特性对比研究[J].中国矿业大学学报,2014,43(3):388-394.Zhang Zunguo,Cao Shugang,Guo Ping,et al.Comparision of the deformation characteristics of coal in gas adsorption process for raw and briquette coals[J].Journal of China University of Mining&Technology,2014,43(3):388-394.
[17]聂百胜,卢红奇,李祥春,等.煤体吸附-解吸瓦斯变形特征实验研究[J].煤炭学报,2015,40(4):754-759.Nie Baisheng,Lu Hongqi,Li Xiangchun,et al.Experimental study on the characteristic of coal deformation during gas adsorption and desorption process[J].Journal of China Coal Society,2015,40(4):754-759.
[18]张遵国.煤吸附/解吸变形特征及其影响因素研究[D].重庆:重庆大学,2015.
[19]周凯.数学建模竞赛入门与提高[M].杭州:浙江大学出版社,2012.
[20]Khalis M,Mir Y,Hemine J,et al.Extraction of equivalent circuit parameters of solar cell:influence of temperature[J].European Physical Journal Applied Physics,2011,54(1):73-79.
[21]谢宇.回归分析[M].北京:社会科学文献出版社,2013.
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