摘要
井下直接法测定煤层瓦斯含量的准确性取决于损失瓦斯量的推算.实验室开展了煤样不同吸附平衡压力的瓦斯解吸实验,采用不同时间段的解吸数据推算了损失瓦斯量.结果表明：煤的累计瓦斯解吸量随时间呈单调递增关系,瓦斯解吸曲线符合幂函数关系;随着吸附平衡压力的增大,推算的损失瓦斯量增大;采用不同的解吸时间段拟合数据,推算出的损失瓦斯量差异明显;井下取样测定解吸瓦斯量时,应注意采集初期的（0～1min）解吸瓦斯量,否则将引起较大的损失瓦斯量推算误差.
The accuracy of the gas content by direct determining method depends on the calculation of losing gas content.The gas de-sorption experiments were done under different adsorption equilibrium pressure in the laboratory.The losing gas content were calculated by desorption date at different times.The results show that with increase in desorption time, the desorbed gas amount increased mono-tonically.And there is a typical power function relation between time and desorbed gas amount.As the adsorption equilibrium pressure increased, the losing gas content by calculation also increased.The losing gas content has significant difference by different desorption date calculation.In the actual work, attention should be paid to the initial desorbed gas amount (0~1 min) , or it will cause losing gas content by calculation larger error.
出处
《煤》
2014年第11期11-12,23,共3页
Coal
关键词
直接法
瓦斯含量
损失瓦斯量
推算方法
direct method
gas content
losing gas content in coal seam
calculation method
