高温高压氛围下煤体吸附瓦斯特性研究
Study on gas adsorption characteristics of coal under high temperature and high pressure atmosphere
申晓静 1岳基伟 2梁跃辉 1王辰 1徐金林 1韩奇峻1
作者信息
- 1. 安徽理工大学 安全科学与工程学院,安徽 淮南 232001
- 2. 安徽理工大学 安全科学与工程学院,安徽 淮南 232001;煤矿深井开采灾害防治技术科技研发平台,安徽理工大学,安徽 淮南 232001;河南理工大学 河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地,河南 焦作 454000
- 折叠
摘要
深部开采面临着高温高压环境,为厘清深部煤体的吸附瓦斯特性,采用等温吸附试验、分子动力学等温吸附模型及理论分析相结合的方法,从宏观角度和微观角度,探究高温高压氛围下煤体吸附瓦斯特性.结果表明:瓦斯压力较低时,不同温度下,绝对吸附量与过剩吸附量的差值差别不大;瓦斯压力较高时,绝对吸附量与过剩吸附量的差值随着温度的升高而增大;瓦斯压力从 0MPa逐渐增加到 20 MPa的过程中,煤体吸附瓦斯量分为前期快速增加、中期短暂稳定、后期逐渐减小3 个阶段;煤的等量吸附热与吸附量满足指数函数关系;基于等量吸附热推演的温度-压力吸附模型可以预测任意温度和压力条件下的等温吸附瓦斯量,预测值与实测值相对误差小于12%.
Abstract
Deep mining faces high temperature and pressure environments.In order to understand the adsorption gas characteristics of deep coal bodies,an isothermal adsorption experiment was conducted to study the coal's adsorption characteristics under different temperature and pressure conditions.The experiment examined both macro and micro perspectives of the coal's adsorption behavior,molecular dynamics isothermal adsorption simulation and theoretical analysis.The research results are as follows.When the gas pressure is low,the difference between the absolute adsorption capacity and the excess adsorption capacity is not significant at different temperatures.When the gas pressure is high,the difference between the absolute adsorption capacity and the excess adsorption capacity increases with the increase in temperature.In the process of gas pressure increasing from 0 to 20 MPa,the amount of gas adsorbed by coal is divided into three stages.The growth pattern consists of a rapid increase during the initial stage,followed by short-term stability in the middle stage,and a gradual decline in the later stage.The equal adsorption heat and adsorption capacity of coal meet the exponential function relationship.The temperature-pressure adsorption model based on the equivalent adsorption heat deduction can predict the quantity of isothermal adsorption gas under any temperature and pressure conditions,and the relative error between the measured and predicted values is 10%.
关键词
高温高压/煤体吸附瓦斯/吸附特性/绝对吸附量/过剩吸附/等量吸附热Key words
high temperature and high pressure/adsorption gas of coal/adsorption characteristics/absolute adsorption capacity/excess adsorption/equal adsorption heat引用本文复制引用
基金项目
国家自然科学基金(52304200)
国家自然科学基金(U23A20601)
安徽省自然科学基金(2308085QE152)
河南省瓦斯地质与瓦斯治理重点实验室省部共建国家重点实验室培育基地开放基金(WS2022B03)
出版年
2024
NETL
NSTL
万方数据