气体分压定律在确定瓦斯压力中的应用

Application of Gas Partial Pressure Law in Determining Gas Pressure

针对目前间接法测试瓦斯压力未考虑气体组分的问题,利用道尔顿分压定律对不同气体组分瓦斯压力的计算进行修正。研究结果表明:当混合气体中CH4组分大于90%时,可以直接利用Langmuir方程计算煤层瓦斯压力,误差在5%以内;当混合气体中CH4组分小于90%时,必须利用气体分压定律,分别计算各气体组分的压力,然后再计算得到混合气体的压力。修正后,计算的瓦斯压力误差在5%以内,能够满足工程需要。

According to the problem of unconsidering the influence of gas component on testing gas pressure with the indirect method. Using Dalton partial pressure law, the gas pressure calculation of different gas component is modified. The results show that the gas pressure can be calculated directly by the Langmuir equation When the CH4 component of the gas mixture is greater than 90%, and the error is less than 5% , when CH4 component of gas mixture is less than 90% , the partial pressure must be calculated firstly by using the law of partial pressure, then the pressure of the mixed gas is calculated. The error of gas pressure is within 5% after correction. The accuracy could meet the needs of engineering.