摘要
超声激励对煤层气开发具有增渗促解效应.本文开展了超声激励前后不同含水煤体瓦斯吸附实验,研究了煤体含水量对超声作用下瓦斯吸附量行为的影响规律.结果表明:超声作用后原煤、干燥煤和饱水煤对瓦斯的最大吸附量分别增加了 27.65%、15.76%和 47.30%,与吸附解吸速率有的常数b值分别增加了 14.29%、6.06%和 23.53%,有利用于促进煤体瓦斯的解吸扩散过程.由此表明,超声激励对煤体瓦斯吸附解吸能力有显著的改善效果,煤样含水量越高,超声引起的吸附能力提升幅度越明显.
Abstract
Ultrasonic stimulation has the effect of increasing permeability and promoting sorption in coalbed methane development.This article conducted gas sorption experiments on coal with different water contents before and after ultrasonic excitation,and studied the influence of water content on the gas adsorption behavior under ultrasonic excitation.The results showed that the maximum adsorption capacity of raw coal,dry coal,and saturated coal for gas increased by 27.65%,15.76%,and 47.30%respectively after ultrasound treatment,and the constant b values related to ad/de-sorption rates increased by 14.29%,6.06%,and 23.53%,respectively,which is beneficial for promoting the desorption and diffusion process of coal gas.It indicates that ultrasonic excitation has a significant improvement effect on the ad/de-sorption capacity of coal gas.The higher the water content of the coal sample,the more significant the increase in adsorption capacity caused by ultrasound.
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