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针对煤矿井下瓦斯含量测定中煤样温度过高、瓦斯放散量过多导致损失量推算出现偏差,使煤层瓦斯含量测值不准确的问题,基于煤的瓦斯放散速度随温度升高而增加的性质,提出了低温(0℃以下)取煤样的方法,以期通过抑制瓦斯的放散来提高瓦斯含量测值的准确性。结合实验室现有条件,设计了低温条件下煤的吸附/解吸实验。结果表明,低温取样可以增加煤对瓦斯的吸附性能,减慢瓦斯放散速度,尤其是对解吸初期影响较大,低温对煤中的瓦斯放散具有抑制作用。
In view of the fact that the temperature of coal sample is too high and the amount of gas released is too large, the calculation of the gas content in the coal mine is inaccurate due to the inaccurate estimation of the gas loss, the nature of the coal gas emission rate increases with temperature , Proposed a method of taking coal samples at low temperature (below 0 ℃) in order to improve the accuracy of gas content measurement by suppressing the gas emission. Combined with the existing conditions in the laboratory, the coal adsorption / desorption experiments at low temperature were designed. The results show that low temperature sampling can increase the adsorption capacity of coal to gas, and slow down the rate of gas release, especially for the early desorption. Low temperature has an inhibitory effect on methane emission.