摘要
基于Weibull解吸方程,从解吸效率角度出发,给出计算敏感压力、过渡压力以及转折压力的新公式,并结合临界压力将解吸过程详细划分为5个阶段。结合寺河3号煤的实际等温解吸实验数据,分析了不同温度下的Weibull等温解吸方程与Langmuir等温解吸方程差异。温度高时,Weibull等温解吸方程与实验数据更加吻合;分析温度对解吸效率、关键压力的影响,要达到同样的解吸效率,温度越高,需要的压力越小;关键压力随着温度的增大,呈先增大后减小的趋势;在地层初始压力相同时,等温解吸过程中,温度越高,结束解吸的压力越小,可解吸的压力范围越大;在煤层初始压力和煤层气含量一定时,温度越高解吸出来的含气量越多。
Based on the Weibull equation of desorption,from the perspective of analytical efficiency,a new formula for calculating sensitive pressure,transition pressure and transition pressure is given,and the process of desorption is divided into five stages by combining the critical pressure.Based on the actual isothermal desorption experiment data of No.3 coal,the differences between Weibull isotherm equation and Langmuir isothermal equation were analyzed.When the temperature is high,the Weibull isothermal solution equation is more consistent with the experimental data.The influence of temperature on the efficiency and key pressure is analyzed;to achieve the same desorption efficiency,the higher the temperature,the lower the required pressure;the key pressure increases and then decreases with the increase of temperature;in the same initial pressure of the formation,during the process of isothermal desorption,the higher the temperature,the less pressure to end the desorption,the more pressure range of the desorption;when the initial pressure of coal seam and the content of coal bed gas are certain,the higher the temperature,the more the desorbing gas content.
出处
《煤矿安全》
CAS
北大核心
2018年第1期44-48,共5页
Safety in Coal Mines
基金
"十二五"国家科技重大专项资助项目(2011ZX05040-002-001)
关键词
煤层气动态解吸过程
Weibull解吸方程
敏感压力
过渡压力
转折压力
dynamic desorption process of coalbed methane
Weibull desorption equation
sensitive pressure
transition pressure
turning pressure
