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为了解取样时间对瓦斯含量直接测定法中损失量推算准确性的影响,论文采用物理模拟直接法,以实验室测定的祁南3煤层和7煤层解吸性能为依据,采用Barrer公式进行损失量的推算。结果表明:推算损失量与实际损失量的误差和读数时间间隔的对数成正比,随解吸初期线性测点个数的减少而减小,瓦斯解吸初期线性测点个数建议选为4-10个。将实际损失量、推算损失量的差值与直接法测定结果的比值控制在10%以内时,有效取样时间与瓦斯压力呈线性关系,且随着压力的增大,取样时间应减小。
In order to understand the effect of sample time on the accuracy of loss estimation in the direct determination of gas content, the paper uses the physical simulation direct method to calculate the amount of loss using Barrer’s formula Projection. The results show that the error between estimated loss and actual loss is proportional to the logarithm of the reading time interval and decreases with the decrease of the number of linear measuring points during the initial desorption. The number of linear measuring points in the initial desorption of gas is suggested as 4-10 A When the ratio of the actual loss and the estimated loss is within 10% of the direct measurement, the effective sampling time is linear with the gas pressure. As the pressure increases, the sampling time should be reduced.