【摘要】 为了研究煤粒瓦斯的解吸规律,设计了恒温定压动态瓦斯吸附解吸实验,提出一种计算瓦斯累积解吸量的方法,即通过测定参考罐和样品罐的压力,计算得到两罐自由空间瓦斯量,连通后得出两罐自由空间瓦斯量分别随时间的变化,进而得到瓦斯累积解吸量随时间变化的实测曲线,研究了同一煤质不同粒径的煤样在不同初始煤粒瓦斯压力下的解吸特性.实验结果表明:煤粒瓦斯累积解吸量的倒数与时间函数成线性关系;同一粒径煤粒初始压力越大,最大瓦斯解吸量越大;相同初始压力条件下,煤粒粒径越小煤粒瓦斯解吸速率越快.该研究成果对预测煤矿瓦斯涌出量具有重要的理论指导意义.更多还原

【Abstract】 In order to study the characteristics of gas desorption in coal particles,this study conducts a dynamic gas adsorption-desorption experiment under constant temperature and pressure,and proposes a new method for calculating accumulated gas desorption amount.With the measured pressures in sample tank and reference tank,the gas quantities in free spaces of two tanks are calculated.Once the two tanks are connected,the gas quantities in the free spaces of two tanks vary with time.Therefore,based on data processing,this study obtains the measured curve of accumulated gas desorption quantity with the change of time.The study investigates the desorption characteristics of coal samples which are in same quality but different sizes under different initial coal particles gas pressure.The experiment results show that the reciprocal of accumulated gas desorption amount and time function is in a linear relationship.For the same size coal particles,the higher the initial pressures are,the larger the maximum gas desorption amount are.Under the same initial pressure,the smaller the coal particle size is,the faster the gas desorption rate is.This study provides a significant theoretical basis for the prediction of gas emission amount in coal mine.更多还原