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针对高压常温条件下采用理想气体状态方程预测煤层瓦斯含量误差较大这一关键问题,运用热力学原理,对煤层卸压瓦斯膨胀系数进行了讨论,随瓦斯压力增大,真实气体的卸压瓦斯膨胀系数与理想气体的差别增大,而温度对卸压瓦斯膨胀系数影响极小,瓦斯卸压膨胀系数与瓦斯压力的关系可用拟合公式表示为k=-0.1167+9.29243p+0.14618p2。采用真实气体卸压瓦斯膨胀系数对胡底煤矿3号煤层和玉溪煤矿3号煤层瓦斯含量进行计算,结果表明,采用理想气体计算的误差可达10%以上,而真实气体计算的最大误差只有4.02%,因此,采用真实气体能更准确地预测煤层瓦斯含量。
In view of the key problem of predicting the error of gas content in coal seam under the condition of high pressure and normal temperature by using ideal gas equation of state, the gas expansion coefficient of coal seam under pressure relief is discussed based on the principle of thermodynamics. With the increase of gas pressure, The difference between the coefficient and the ideal gas increases, and the temperature has little effect on the expansion coefficient of the pressure relief gas. The relation between the pressure relief expansion coefficient and the gas pressure can be expressed as k = -0.1167 + 9.29243p + 0.14618p2 by fitting formula. The gas content of No. 3 coal seam in Hudi Coal Mine and No. 3 coal seam of Yuxi Coal Mine is calculated by real gas relief gas expansion coefficient. The results show that the error of ideal gas calculation can reach more than 10%, while the maximum error of real gas calculation is only 4.02 %, Therefore, the use of real gas can more accurately predict the coal seam gas content.