Experimental study on gas adsorption and desorption characteristics of coal sample under variable temperature and pressure
-
摘要: 为研究温度、压力对煤样瓦斯吸附解吸特性的影响，利用瓦斯吸附解吸实验装置，分析了不同温度（20，25，30，35，40，45，50 ℃）、压力（0～5 MPa）下的吸附量、等量吸附热、Langmuir吸附常数、初始有效扩散系数及扩散动力学参数变化特征。结果表明：煤样瓦斯吸附量随温度升高而减小，随压力增大而增大；吸附量恒定时，温度越高，瓦斯吸附压力越大，且等量吸附热随吸附量增大而增大；Langmuir吸附常数a随温度升高先减小后增大再减小，且在45 ℃时达到峰值，Langmuir吸附常数b随温度升高而减小；初始有效扩散系数和扩散动力学参数随温度升高而增大，且在35～40 ℃时增大幅度最明显。Abstract: In order to study influence of temperature and pressure on gas adsorption and desorption characteristics of coal sample, adsorption capacity, isosteric heat of adsorption, Langmuir adsorption constant, initial effective diffusion coefficient and diffusion kinetic parameter under different temperatures(20,25,30,35,40,45,50 ℃) and pressure(0-5 MPa) were analyzed by use of gas adsorption and desorption experimental device. The results show that adsorption capacity decreases with the increase of temperature and increases with the increase of pressure. When adsorption capacity is constant, the higher the temperature is, the greater the gas adsorption pressure is, and isosteric heat of adsorption increases with the increase of adsorption capacity. Langmuir adsorption constant a decreases firstly, and then rises and decreases again with the increase of temperature, and reaches peak value at 45 ℃, while Langmuir adsorption constant b decreases with the increase of temperature. Initial effective diffusion coefficient and diffusion kinetic parameter increase with the increase of temperature, and increase amplitude is most obvious at 35-40 ℃.
-
-
期刊类型引用(3)
1. 许慧敏. 温度和压力对煤样瓦斯吸附解吸的影响规律研究. 煤. 2024(12): 5-8 . 
百度学术
2. 冯小军，邓狮狮，刘泉霖，王恩元. 基于双孔扩散模型的瓦斯扩散系数压力依赖特性数值分析研究. 煤炭学报. 2024(S2): 958-969 . 百度学术
3. 李树刚，秦雪燕，白杨，龙航，岳敏，严敏. 煤吸附瓦斯影响因素的正交设计实验研究. 矿业安全与环保. 2022(04): 72-79 . 百度学术
其他类型引用(7)
计量
- 文章访问数: 95
- HTML全文浏览量: 11
- PDF下载量: 14
- 被引次数: 10
下载:
