摘要
按照毛细管模型与单分子层作用模型 ,推导了煤层气—固界面作用与煤层渗透性的关系 ;根据煤层气吸附实验资料 ,运用非线性回归方法 ,分别按Langmuir吸附理论和BET吸附理论计算了煤层气吸附规律。实例分析表明 :煤层气—固界面作用的强弱与煤层介质的渗透率平方根或煤层介质的孔径大小成反比 ,它揭示了低渗透煤层气解吸困难、开采难度较大的机理 ;BET吸附模型比Langmuir吸附模型能更好地描述煤层气的吸附规律。
A relationship between permeability of coal-bed and interaction of coal-bed methane and coal was derived according to a capillary model and a singular layer molecular model. Adsorption law of coal-bed methane was obtained by a nonlinear regression method based on experiment data of the adsorption, according to adsorption theories of Langmuir and BET respectively. An example was given and discussed. Results show that the interaction strength is inverse proportion to square root of permeability and pore radius of coal-bed, which suggested the mechanisms why desorption of the methane in low permeability coal is difficult and the methane is not easy to develop, as well as the BET model is better fit for adsorption of coal-bed methane than the Langmuir model. The results can provide coal-bed methane development engineering design with scientific basis.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2004年第3期24-26,共3页
Coal Geology & Exploration
基金
国家 973项目 (编号 :2 0 0 2CB2 1170 0 )
国家自然科学基金项目 (面上项目
编号 :4 0 2 0 2 0 36 )
关键词
煤层气
吸附
模型
解吸
机理
非线性回归
coalbed methane
adsorption
model
desorption
mechanism
nonlinear regression
