煤粒瓦斯解吸实验中的初始有效扩散系数
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摘要
为研究煤体瓦斯解吸过程瓦斯初始扩散规律,采用理论分析煤粒瓦斯解吸扩散过程,根据扩散方程解析得到瓦斯初始有效扩散系数和扩散动力学参数的近似解计算方法.对振兴二矿煤样进行不同粒径煤样、不同温度条件和不同吸附平衡压力条件下的煤粒瓦斯解吸扩散实验,并计算各种实验状态下的瓦斯初始有效扩散系数和扩散动力学参数.研究结果表明:初始有效扩散系数与吸附平衡压力、温度和煤样粒径呈正相关.不同粒径的煤粒,在压力和温度相同的平衡条件下,煤粒的粒径越大,初始有效扩散系数越大.同一粒径条件下,初始有效扩散系数随温度和吸附平衡压力的升高而增大.而动力学扩散参数则基本随着粒径的减小而增大,随吸附平衡压力和温度的升高而增大.
In order to study the gas initial diffusion law of coal gas desorption process,gas desorption process was analyzed.The approximate solutions of initial effective diffusion coefficient and the kinetic diffusion parameters were obtained according to the diffusion equation.Some Isothermal adsorption and desorption tests of methane in coal particles had been done under different conditions in the lab.The tests had been done under different temperature and different equilibrium pressure of coal particles with different radius.The results show that the bigger the value of the equilibrium pressure,the bigger the value of the initial effective diffusion coefficient and the diffusion rate of gas.And the initial effective diffusion coefficient and the activation energy increase with the rise of temperature.The initial effective diffusion coefficient increases with the increases of radius of coal particles while the active energy decreases with it.
In order to study the gas initial diffusion law of coal gas desorption process,gas desorption process was analyzed.The approximate solutions of initial effective diffusion coefficient and the kinetic diffusion parameters were obtained according to the diffusion equation.Some Isothermal adsorption and desorption tests of methane in coal particles had been done under different conditions in the lab.The tests had been done under different temperature and different equilibrium pressure of coal particles with different radius.The results show that the bigger the value of the equilibrium pressure,the bigger the value of the initial effective diffusion coefficient and the diffusion rate of gas.And the initial effective diffusion coefficient and the activation energy increase with the rise of temperature.The initial effective diffusion coefficient increases with the increases of radius of coal particles while the active energy decreases with it.
引文
[1]范章群.煤层气解吸研究的现状及发展趋势[J].中国煤层气,2008,5(4):6-10.FAN Zhangqun.Current status and developing trend of CBM desorption study[J].China Coalbed Methane,2008,5(4):6-10.
[2]CRANK J.The Mathematics of Diffusion[M].Oxford University Press,1979.
[3]RUPPEL T C,GRTIN C T,BIENSTOCK D.Adsorption of methane/ethane mixtures on dry coal at elevated pressure[J].Fuel,1972,51(4):297-303.
[4]STEVENSON M D,PINCZEWSKI W V,SOMERS M L,et al.Adsorption/Desorption of Multicomponent Gas Mixtures at In-Seam Conditions[C].SPE Paper 23026,Presented at the SPE Asia-Pacific Conference,Perth,Western Australia,1991:741-747.
[5]CLARKSON C R,BUSTIN R M.Binary gas adsorption/desorption isotherms:effect of moisture and coal composition upon carbon dioxide selectivity over methane[J].International Journal of Coal Geology,2000,42(4):241-271.
[6]CUI X,BUSTIN R M,DIPPLE G.Selective transport of CO2,CH4,and N2 in coals:insights from modeling of experimental gas adsorption data[J].Fuel,2004,83(3):293-303.
[7]SHI J Q,DURUCAN S A.Bidisperse pore diffusion model for methane displacement desorption in coal by CO2 injection[J].Fuel,2003,82(10):1 219-1 229.
[8]WEI X R,WANG G X,MASSAROTTO P,et al.Numerical simulation of multicomponent gas diffusion and flow in coals for CO2 enhanced coalbed methane recovery[J].Chemical Engineering Science,2007,62(16):4 193-4 203.
[9]王佑安,杨思敬.煤和瓦斯突出危险煤层的某些特征[J].煤炭学报,1980(1):33-37.WANG Youan,YANG Sijing.Some of the characteristics of coal and gas outburst danger of coal seam[J].Journal of Coal,1980(1):33-37.
[10]聂百胜,郭勇义,吴世跃,等.煤粒瓦斯扩散的理论模型及其解析解[J].中国矿业大学学报,2001,30(1):19-22.NIE Baisheng,GUO Yongyi,WU Shiyue,et al.The theoretical model of coal particle gas diffusion and its analytical solution[J].Journal of China University of Mining,2001,30(1):19-22.
[11]吴世跃,郭勇义.注气开采煤层气增产机制的研究[J].煤炭学报,2001,26(2):199-203.WU Shiyue,GUOYongyi.The exploitation of coal-bed methane gas injection production mechanism research[J].Journal of China Coal Society,2001,26(2):199-203.
[12]聂百胜,杨涛,李祥春,等.煤粒瓦斯解吸扩散规律实验[J].中国矿业大学学报,2013,42(6):975-981.NIE Baisheng,YANG Tao,LI Chunxiang,et al.The diffusion regularity of coal particle gas desorption experiments[J].Journal of China University of Mining,2013,42(6):975-981.
[13]NIE B,YANG T,LU H,et al.Gas diffusion model through coal particles and parameters calculation[J].Disaster Advances,2013,6(12):51-56.
[14]THIMONS E D,KISSELL F N.Diffusion of methane through coal[J].Fuel,1973,52(4):274-280.
[15]SMITH D M,WILLIAMS F L.Diffusion models for gas production from coal:Determination of diffusion parameters[J].Fuel,1984,63(2):256-261.
[16]BUSCH A,GENSTERBLUM Y,KROOSS B M,et al.Methane and carbon dioxide adsorption-diffusion experiments on coal:upscaling and modeling[J].International Journal of Coal Geology,2004,60(2-4):151-168.
[17]NANDI S P,WALKER J P.Activated diffusion of methane in coal[J].Fuel,1970,49(3):309-323.
[18]NANDI S P,WALKER J P.Activated diffusion of methane from coals at elevated pressures[J].Fuel,1975,54(2):81-86.
[19]许江,刘东,彭守建,等.不同突出口径条件下煤与瓦斯突出模拟试验研究[J].煤炭学报,2013,38(1):9-14.XU Jiang,LIU Dong,PENG Shoujian,et al.Under the condition of different outstanding caliber of coal and gas outburst simulation experiment research[J].Journal of China Coal Society,2013,38(1):9-14.
[20]王志宏,乔楠.煤与瓦斯突出强度的IGA-LSSVM预测模型[J].辽宁工程技术大学学报(自然科学版),2015,34(7):791-796.doi:10.11956/j.issn.1008-0562.2015.07.005.WANG Zhihong,QIAO Nan.Prediction model of coal and gas outburst intensity based on IGA-LSSVM[J].Journal of Liaoning Technical University(Natural Science),2015,34(7):791-796.DOI:10.11956/j.issn.1008-0562.2015.07.005.
[21]齐庆杰,武宇,董子文,等.煤与瓦斯突出预测敏感指标[J].辽宁工程技术大学学报(自然科学版),2015,34(3):329-334.doi:10.11956/j.issn.1008-0562.2015.03.009.QI Qingjie,WU Yu,DONG Ziwen,et al.Sensitive indicators of coal and gas outburst[J].Journal of Liaoning Technical University(Natural Science),2015,34(3):329-334.DOI:10.11956/j.issn.1008-0562.2015.03.009.
[2]CRANK J.The Mathematics of Diffusion[M].Oxford University Press,1979.
[3]RUPPEL T C,GRTIN C T,BIENSTOCK D.Adsorption of methane/ethane mixtures on dry coal at elevated pressure[J].Fuel,1972,51(4):297-303.
[4]STEVENSON M D,PINCZEWSKI W V,SOMERS M L,et al.Adsorption/Desorption of Multicomponent Gas Mixtures at In-Seam Conditions[C].SPE Paper 23026,Presented at the SPE Asia-Pacific Conference,Perth,Western Australia,1991:741-747.
[5]CLARKSON C R,BUSTIN R M.Binary gas adsorption/desorption isotherms:effect of moisture and coal composition upon carbon dioxide selectivity over methane[J].International Journal of Coal Geology,2000,42(4):241-271.
[6]CUI X,BUSTIN R M,DIPPLE G.Selective transport of CO2,CH4,and N2 in coals:insights from modeling of experimental gas adsorption data[J].Fuel,2004,83(3):293-303.
[7]SHI J Q,DURUCAN S A.Bidisperse pore diffusion model for methane displacement desorption in coal by CO2 injection[J].Fuel,2003,82(10):1 219-1 229.
[8]WEI X R,WANG G X,MASSAROTTO P,et al.Numerical simulation of multicomponent gas diffusion and flow in coals for CO2 enhanced coalbed methane recovery[J].Chemical Engineering Science,2007,62(16):4 193-4 203.
[9]王佑安,杨思敬.煤和瓦斯突出危险煤层的某些特征[J].煤炭学报,1980(1):33-37.WANG Youan,YANG Sijing.Some of the characteristics of coal and gas outburst danger of coal seam[J].Journal of Coal,1980(1):33-37.
[10]聂百胜,郭勇义,吴世跃,等.煤粒瓦斯扩散的理论模型及其解析解[J].中国矿业大学学报,2001,30(1):19-22.NIE Baisheng,GUO Yongyi,WU Shiyue,et al.The theoretical model of coal particle gas diffusion and its analytical solution[J].Journal of China University of Mining,2001,30(1):19-22.
[11]吴世跃,郭勇义.注气开采煤层气增产机制的研究[J].煤炭学报,2001,26(2):199-203.WU Shiyue,GUOYongyi.The exploitation of coal-bed methane gas injection production mechanism research[J].Journal of China Coal Society,2001,26(2):199-203.
[12]聂百胜,杨涛,李祥春,等.煤粒瓦斯解吸扩散规律实验[J].中国矿业大学学报,2013,42(6):975-981.NIE Baisheng,YANG Tao,LI Chunxiang,et al.The diffusion regularity of coal particle gas desorption experiments[J].Journal of China University of Mining,2013,42(6):975-981.
[13]NIE B,YANG T,LU H,et al.Gas diffusion model through coal particles and parameters calculation[J].Disaster Advances,2013,6(12):51-56.
[14]THIMONS E D,KISSELL F N.Diffusion of methane through coal[J].Fuel,1973,52(4):274-280.
[15]SMITH D M,WILLIAMS F L.Diffusion models for gas production from coal:Determination of diffusion parameters[J].Fuel,1984,63(2):256-261.
[16]BUSCH A,GENSTERBLUM Y,KROOSS B M,et al.Methane and carbon dioxide adsorption-diffusion experiments on coal:upscaling and modeling[J].International Journal of Coal Geology,2004,60(2-4):151-168.
[17]NANDI S P,WALKER J P.Activated diffusion of methane in coal[J].Fuel,1970,49(3):309-323.
[18]NANDI S P,WALKER J P.Activated diffusion of methane from coals at elevated pressures[J].Fuel,1975,54(2):81-86.
[19]许江,刘东,彭守建,等.不同突出口径条件下煤与瓦斯突出模拟试验研究[J].煤炭学报,2013,38(1):9-14.XU Jiang,LIU Dong,PENG Shoujian,et al.Under the condition of different outstanding caliber of coal and gas outburst simulation experiment research[J].Journal of China Coal Society,2013,38(1):9-14.
[20]王志宏,乔楠.煤与瓦斯突出强度的IGA-LSSVM预测模型[J].辽宁工程技术大学学报(自然科学版),2015,34(7):791-796.doi:10.11956/j.issn.1008-0562.2015.07.005.WANG Zhihong,QIAO Nan.Prediction model of coal and gas outburst intensity based on IGA-LSSVM[J].Journal of Liaoning Technical University(Natural Science),2015,34(7):791-796.DOI:10.11956/j.issn.1008-0562.2015.07.005.
[21]齐庆杰,武宇,董子文,等.煤与瓦斯突出预测敏感指标[J].辽宁工程技术大学学报(自然科学版),2015,34(3):329-334.doi:10.11956/j.issn.1008-0562.2015.03.009.QI Qingjie,WU Yu,DONG Ziwen,et al.Sensitive indicators of coal and gas outburst[J].Journal of Liaoning Technical University(Natural Science),2015,34(3):329-334.DOI:10.11956/j.issn.1008-0562.2015.03.009.