基于Langmuir吸附的瓦斯含量和瓦斯压力的对应关系

为探讨煤层瓦斯含量和瓦斯压力的对应关系，应用Langmuir方程，分析总结了吸附常数测值的影响因素，初步阐述了瓦斯含量和瓦斯压力的内在联系，并进行了不同变质程度煤的相关实验研究和理论计算。研究结果表明：Langmuir吸附常数测试受吸附时间、压力点设置、温度和水分含量等多种因素影响；利用修正的Langmuir方程换算的瓦斯含量或瓦斯压力与煤的变质程度有关，在低煤级阶段表现为高压低含量特点，而高煤级阶段正好相反，瓦斯压力0.74 MPa和瓦斯含量8 m³/t只有在贫煤阶段才近似一致。建议综合考虑地质构造和构造煤发育情况，以实测瓦斯压力为主要依据，针对不同变质程度煤的矿井制定合理的突出预测指标。

Research on relationship between gas content and gas pressure based on Langmuir adsorption

In order to investigate the relationship between gas content and gas pressure, the Langmuir equation was deduced, the influence factors of adsorption constant was analyzed and summarized, and the internal relation between gas content and gas pressure was illustrated preliminarily. Meanwhile the relevant experimental study and theoretical calculation of coal of different metamorphic grade were carried out. The results show that the adsorption time, the pressure point setting, the temperature and the moisture content are main influencing factors of the Langmuir adsorption constant. The calculation results about gas content and gas pressure by modified Langmuir equation are related to the metamorphic degree. The low gas content may correspond to a high gas pressure in low rank stage, while the situation is opposite in high rank stage. Gas pressure 0.74 MPa and gas content 8 m3/t is only approximately consistent in lean coal. It is suggested to consider intergrately the features of geological structures and development of the tectonic coal to formulate reasonable outburst prediction index aiming at mines with coal of different metamorphic degree on the basis of the measured gas pressure.