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.
作者
严敏
龙航
白杨
林海飞
YAN Min;LONG Hang;BAI Yang;LIN Haifei(College of Safety Science and Engineering, Xi'an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education,Xi'an 710054,China)
出处
《矿业安全与环保》
北大核心
2019年第3期6-10,共5页
Mining Safety & Environmental Protection
基金
国家自然科学基金青年基金项目(51604220)
中国博士后科学基金面上项目(2017M610643)
关键词
煤层瓦斯
温度效应
吸附热
扩散系数
动力学扩散参数
扩散活化能
coal seam gas
temperature effect
adsorption heat
diffusion coefficient
kinetic diffusion parameter
diffusion activation energy
