基于阻抗法煤体中瓦斯水合动力学研究
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摘要
为探寻水合物技术在瓦斯突出防治方向上的应用工艺,利用瓦斯水合固化过程阻抗特性监测实验装置,研究4组不同煤体孔隙裂隙分布对瓦斯水合过程的影响,获取了煤体中瓦斯水合过程阻抗曲线,计算了瓦斯水合物生长速率与含气量。结果表明:实验釜上层位阻值增大,中层位与下层位阻值减小,瓦斯水合物集中在实验釜上层位与中层位形成;相同热力学条件下4组体系中瓦斯水合物生长速率分别为0.180,0.083,1.747,0.448 cm~3/min,水合物含气率分别为1.9×10~(-3),6.3×10~(-3),2.1×10~(-3),1.6×10~(-3)mol/cm~3,说明孔隙裂隙较发育煤体中瓦斯水合速率较快,所形成水合物具有较高的含气量。不同孔隙裂隙煤体中单位体积瓦斯水合物含气量不同,孔隙裂隙较发育煤体中瓦斯水合物形成量较大,基于准均匀占据理论,孔隙裂隙较发育煤体中瓦斯水合物所含空晶笼较多。
To explore the application of hydrate technology in preventing coal and gas outburst,the impedance monitoring experiment devices of mine gas curing process is used to study the effect of four kinds of different pore and fractal distributions on mine gas hydration process. Meanwhile,the impedance characteristic curve of mine gas hydration process in coal is obtained.The growth rate and gas content of mine gas hydrate are calculated. The results show that impedance value increases in the upper layer and it decreases in the middle and lower layers of the experimental reactor.Mine gas hydrate mainly forms in the upper and middle layers of the experimental reactor.Under the same thermodynamic conditions,the gas hydrate formation rate in the four experimental systems is 0. 180,0. 083,1. 747 and 0. 448 cm~3/min respectively.The gas fraction is 1.9×10~(-3),6.3×10~(-3),2.1×10~(-3)and 1.6×10~(-3)mol/cm~3 respectively.The above data indicates that the mine gas hydration rate is quicker in the coal which contains more pore and fractures due to the high gas content in mine gas hydrate.The gas content of unit volume mine gas hydrate is different with the var-ying pore and fractures in coal and the quantity of mine gas hydrate is larger in the coal with more pore and fractures.Based on the theory of homogeneous occupy,the mine gas hydrate contains more hollow cages in the coal with more pore and fractures.
To explore the application of hydrate technology in preventing coal and gas outburst,the impedance monitoring experiment devices of mine gas curing process is used to study the effect of four kinds of different pore and fractal distributions on mine gas hydration process. Meanwhile,the impedance characteristic curve of mine gas hydration process in coal is obtained.The growth rate and gas content of mine gas hydrate are calculated. The results show that impedance value increases in the upper layer and it decreases in the middle and lower layers of the experimental reactor.Mine gas hydrate mainly forms in the upper and middle layers of the experimental reactor.Under the same thermodynamic conditions,the gas hydrate formation rate in the four experimental systems is 0. 180,0. 083,1. 747 and 0. 448 cm~3/min respectively.The gas fraction is 1.9×10~(-3),6.3×10~(-3),2.1×10~(-3)and 1.6×10~(-3)mol/cm~3 respectively.The above data indicates that the mine gas hydration rate is quicker in the coal which contains more pore and fractures due to the high gas content in mine gas hydrate.The gas content of unit volume mine gas hydrate is different with the var-ying pore and fractures in coal and the quantity of mine gas hydrate is larger in the coal with more pore and fractures.Based on the theory of homogeneous occupy,the mine gas hydrate contains more hollow cages in the coal with more pore and fractures.
引文
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[9]周兴法,谢应明,杨亮,等.直接接触式制备CO2水合物的生长和蓄冷特性[J].化工学报,2015,66(4):1521-1528.ZHOU Xingfa,XIE Yingming,YANG Liang,et al.Characteristics of growth and cool storage of CO2hydrates produced in direct-contact way[J].CIESC Journal,2015,66(4):1521-1528.
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[11]WU Q,ZHANG Q,ZHANG B Y.Influence of super-absorbent polymer on the growth rate of gas hydrate[J].Safety Science,2012,50:865-869.
[12]张强,吴强,张保勇,等.Na Cl-SDS复合溶液中多组分瓦斯水合物成核动力学机理[J].煤炭学报,2015,40(10):2430-2436.ZHANG Qiang,WU Qiang,ZHANG Baoyong,et al.Nucleation kinetics mechanism of multi-component mine gas hydrate in Na Cl-SDS mixed solutions[J].Journal of China Coal Society,2015,40(10):2430-2436.
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[19]张剑,业渝光.天然气水合物探测技术的模拟实验研究[J].海洋地质动态,2003,19(6):28-30.ZHANG Jian,YE Yuguang.Detecting technology in the eperimental study of gas hydrate[J].Marine Geology Letters,2003,19(6):28-30.
[20]孟庆国,业渝光,王士财,等.电阻探测技术在天然气水合物模拟实验中的应用[J].青岛大学学报(工程技术版),2008,23(3):15-18.MENG Qingguo,YE Yuguang,WANG Shicai,et al.Application of resistance detecting technology in the eperimental study of gas hydrate[J].Journal of Qingdao University(E&T),2008,23(3):15-18.
[21]任静雅,鲁晓兵,张旭辉.水合物沉积物电阻特性研究初探[J].岩土工程学报,2013,35(1):161-165.REN Jingya,LU Xiaobing,ZHANG Xuhui.Preliminary study on electric resistance of hydrate-bearing sediments[J].Chinese Journal of Geotechnical Engineering,2013,35(1):161-165.
[22]赵洪伟,陈建文,龚建明,等.天然气水合物饱和度的预测方法[J].海洋地质动态,2004,20(6):22-24.ZHAO Hongwei,CHEN Jianwen,GONG Jianming,et al.Prediction method of gas hydrate saturation[J].Marine Geology Letters,2004,20(6):22-24.
[23]赵洪伟,刁少波,业渝光,等.多孔介质中水合物阻抗探测技术[J].海洋地质与第四纪地质,2005,25(1):137-142.ZHAO Hongwei,DIAO Shaobo,YE Yuguang,et al.Technique of detecting impedanceof hydrate in porousmedium[J].Marine.Geology&Qua.Terna.Ry.Geology,2005,25(1):137-142.
[24]张郁,吴慧杰,李小森,等.多孔介质中甲烷水合物的生成特性的实验研究[J].化学学报,2011,69(19):2221-2227.ZHANG Yu,WU Huijie,LI Xiaosen,et al.Experimental study on formation behavior of methane hydrate in porous media[J].Acta Chimica Sinica,2011,69(19):2221-2227.
[25]臧小亚,梁德青,吴能友.多孔介质中甲烷水合物的生成特性研究进展[J].新能源进展,2015,3(2):131-138.ZANG Xiaoya,LIANG Deqing,WU Nengyou.Research progress on methane hydrate formation kinetics in porous media[J].Advances in New and Renewable Energy,2015,3(2):131-138.
[26]LI S X,XIA X R,XUAN J,et al.Resistivity in formation and decomposition of natural gas hydrate in porous medium[J].Chinese Journal of Chemical Engineering,2010,18:39-42.
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