突出危险型煤瓦斯等温解吸试验研究

Experimental study on isothermal desorption of methane from outburst-prone briquette

为深入研究突出危险煤瓦斯解吸特征,以块状型煤为研究对象,开展瓦斯等温吸附和解吸试验,分析解吸试验过程中最小平衡压力对解吸过程吸附常数的影响,探讨瓦斯吸附和解吸过程的可逆性、合理的解吸试验压力条件及其数据处理方法。结果表明:最小平衡压力对解吸过程吸附常数拟合结果影响较大;突出危险型煤在实验室条件下,等温吸附/解吸瓦斯过程有典型的可逆性,解吸过程有滞后性;等温解吸曲线仍服从Langmuir方程;为使解吸试验结果可靠性更高,拟合中应考虑解吸完全时的状态,即解吸平衡压力为0 MPa、残余吸附量为0 m L/g时的数据;解吸试验过程中,最小平衡压力不宜高于0.51 MPa。

In order to research characteristics of desorption of methane from outburst-prone coal,experiments were carried out on briquettes made of outburst-prone coal. Influence of the minimum equilibrium pressure on the adsorption constants during desorption experiment was analyzed. Reversibility of methane adsorption and desorption processes,the reasonable pressure conditions for gas isothermal desorption experiment and its data processing method were discussed. The results show that the minimum equilibrium pressure has a great influence on the fitting results of adsorption constants during desorptionexperiment,that the experiment processes are typically reversible,and there is a delay in the desorption process,that the isothermal desorption curves still obey Langmuir equation,and that to improve the reliability of the experiment results,the data on complete desorption state（ desorption equilibrium pressure is 0 MPa and the residual adsorption is 0 m L/g） should be considered in firring,and the minimum equilibrium pressure for desorption experiment should not be higher than 0.51 MPa.