温度效应对煤层瓦斯吸附解吸特性影响的实验研究
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摘要
对煤体瓦斯吸附解吸扩散过程进行了理论分析,根据Clausius-Clapeyron方程计算煤体在不同温度下的吸附热值,利用菲克定律求解煤体瓦斯在不同温度下的扩散系数和动力学扩散参数,研究其与温度之间的关系,并利用阿伦尼乌斯修正式计算得到煤体瓦斯解吸过程的活化能。研究结果表明,煤体瓦斯吸附量随着吸附温度的升高而降低,初始有效扩散系数及动力学扩散参数与瓦斯解吸温度呈正相关关系,利用阿伦尼乌斯修正式,计算得到实验煤样瓦斯解吸扩散活化能为2. 71 kJ/mol。从吸附热力学、解吸动力学,以及分子活化能3个方面研究了温度效应对瓦斯吸附解吸特性的影响,可为工程实践提供一定的基础理论支撑。
The gas adsorption,desorption and diffusion process on coal was analyzed theoretically,Clausius-Clapeyron equation was used to calculate the adsorption calorific value of coal body at different temperatures. Using fick's law,the diffusion coefficient and kinetic diffusion parameters of coal gas at different temperatures were solved,and the relationship among them and temperature was studied,the activation energy in the gas desorption process of coal body was calculated by Arrhenius correction formula. The results show that the gas adsorption decreases with the increase of adsorption temperature,the initial effective diffusion coefficient and kinetic diffusion parameter are positively correlated with gas desorption temperature,using the Arrhenius correction formula,the desorption diffusion activation energy of the experimental coal sample is calculated to be 2. 71 kJ/mol. The effects of temperature on gas adsorption and desorption characteristics were studied from three aspects of adsorption thermodynamics,desorption kinetics and molecular activation energy,which provided some basic theoretical support for engineering practice.
The gas adsorption,desorption and diffusion process on coal was analyzed theoretically,Clausius-Clapeyron equation was used to calculate the adsorption calorific value of coal body at different temperatures. Using fick's law,the diffusion coefficient and kinetic diffusion parameters of coal gas at different temperatures were solved,and the relationship among them and temperature was studied,the activation energy in the gas desorption process of coal body was calculated by Arrhenius correction formula. The results show that the gas adsorption decreases with the increase of adsorption temperature,the initial effective diffusion coefficient and kinetic diffusion parameter are positively correlated with gas desorption temperature,using the Arrhenius correction formula,the desorption diffusion activation energy of the experimental coal sample is calculated to be 2. 71 kJ/mol. The effects of temperature on gas adsorption and desorption characteristics were studied from three aspects of adsorption thermodynamics,desorption kinetics and molecular activation energy,which provided some basic theoretical support for engineering practice.
引文
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[3]李晓疆,蔚文斌,贾永勇,等.不同粒径下煤样瓦斯吸附热力学特性影响实验研究[J].矿业安全与环保,2017,44(6):25-30.
[4] NODZEN'SKI A. Sorption and desorption of gases(CH4,CO2)on hard coal and active carbon at elevated pressures[J].Fuel,1998,77(11):1243-1246.
[5] CHEN F,ZHOU C,LI G,et al. Thermodynamics and kinetics of glyphosate adsorption on resin D301[J].Arabian Journal of Chemistry,2016,9(S1):665-669.
[6]曾社教,马东民,王鹏刚.温度变化对煤层气解吸效果的影响[J].西安科技大学学报,2009,29(4):449-453.
[7]何满潮,王春光,李德建,等.单轴应力—温度作用下煤中吸附瓦斯解吸特征[J].岩石力学与工程学报,2010,29(5):865-872.
[8]康博.低温环境煤的瓦斯解吸特性研究[D].焦作:河南理工大学,2013.
[9]王兆丰,康博,岳高伟,等.低温环境无烟煤瓦斯解吸特性研究[J].河南理工大学学报,2014,33(6):705-709.
[10] GUO W,XIONG W,GAO S,et al. Impact of temperature on the isothermal adsorption/desorption of shale gas[J].Petroleum Exploration&Development,2013,40(4):514-519.
[11]BUZEK F,LNENICKOVA Z. Temperature programmed desorption of coal gases-Chemical and carbon isotope composition[J]. Fuel,2010,89(7):1514-1524.
[12]聂百胜,杨涛,李祥春,等.煤粒瓦斯解吸扩规律实验[J].中国矿业大学学报,2013,42(6):975-981.
[13] LANGMUIR I. The adsorption of gases on plane surfaces of glass,mica and platinum.[J]. Journal of Chemical Physics,1918,40(12):1361-1403.
[14]刘小磊,吴财芳,夏大平.高压下页岩吸附特性及吸附异常原因分析[J].中国矿业,2014,23(12):124-127.
[15] THIMONS E D,KISSELL F N. Diffusion of methane through coal[J]. Fuel,1973,52(4):274-280.
[16] NI W M. The mathematics of diffusion[J]. Oxford University,2011,7(10):1-10.
[17] LU S, CHENG Y, QIN L, et al. Gas desorption characteristics of the high-rank intact coal and fractured coal[J]. International Journal of Mining Science and Technology,2015,25(5):819-825.