瓦斯含量直接测定法在大方煤田的研究

Trial research of gas-content direct mensuration in Dafang coal field

利用DGC型瓦斯含量直接测定装置对煤样进行瓦斯解吸速度和瓦斯解吸量的测定,结合损失量推算模型进行损失瓦斯量的推算和常压解吸量的计算,得出煤层的可解吸瓦斯含量,再通过朗格缪尔方程计算煤层的不可解吸瓦斯量,从而实现煤矿井下煤层瓦斯含量的直接快速测定。经过在大方煤田的现场试验,将直接测定法与间接法测算的煤层瓦斯含量进行比较,反算了煤层瓦斯压力,与实测瓦斯压力进行对比验证。结果表明:直接法和间接法测算的煤层瓦斯含量值、瓦斯压力值相近,该法可为矿井提供了准确可靠的煤层瓦斯基本参数。

The DGC type gas-content direct measuring device is used to determine gas releasing speed and volume.Combined with the gas losing calculation model,lost gas volume and gas releasing volume under normal pressure is calculated,and hence coal seam＇s releasable gas content is obtained.Further more,by using Langmuir equation,the un-releasable gas volume in coal seams is calculated.Consequently,a direct and speedy determination way to measure coal seam＇s gas content underground is realized.Trials were done on the site of Dafang coal filed,and coal seam＇s contents measured by using direct mensuration and indirect mensuration are compared.This result is used reversely to calculate coal seam＇s gas pressure.Comparison and verification are made with the real measured gas pressure.The result indicates that,coal seam＇s gas content and pressure measured by direct and indirect ways are comparable.These provide exact and reliable coal seam＇s basic parameter data to coal mines.