煤粒瓦斯解吸时变规律实验研究

Experimental research on time-varying law of coal gas desorption

针对目前瓦斯解吸研究采样范围小、解吸模型计算结果与实测数据之间存在误差等问题,采集多个煤矿的煤样进行解吸实验,扩大煤样采集范围;基于搭建的煤粒瓦斯解吸实验平台,采用控制变量法,分析煤粒在不同吸附平衡压力、不同温度、不同粒度下的瓦斯解吸时变规律。得出以下结论:吸附平衡压力越大,瓦斯解吸量越大;粒度越大,解吸量和解吸速度越小,到达阈值粒度后,粒度对解吸量和解吸速度的影响较小;温度越高,解吸量越大;随着时间的增加,瓦斯解吸量逐渐增加,瓦斯解吸速度逐渐减小。对不同地质条件下的煤样进行解吸实验研究,提高了瓦斯解吸模型的适用性,进一步验证了温度、粒度等主控因素对瓦斯解吸规律的影响。

In view of problems that current gas desorption research has small sampling range and there is error between desorption model calculation results and measured data,desorption experiments were carried out on coal samples from multiple mines,so as to expand collection range of coal samples.Based on experimental platform for gas desorption of coal particles,time-varying law of coal particles at different adsorption equilibrium pressures,different temperatures and different particle sizes was analyzed by using the control variable method,and the following conclusions were drawn:the greater the adsorption equilibrium pressure,the greater the gas desorption amount;the larger the particle size,the smaller the desorption amount and desorption speed,but after reaching the threshold particle size,the particle size has less effect on the desorption amount and desorption speed;the higher the temperature,the greater the gas desorption amount;the desorption amount gradually increases and the gas desorption speed gradually decreases with the increase of time.The experimental study on desorption of coal samples under different geological conditions has improved applicability of gas desorption model,and further verified influence of temperature,particle size and other main control factors on gas desorption rule.