相似准数法煤粒瓦斯扩散系数计算

发布时间：2018-06-13 04:51

本文选题：相似理论 + 扩散系数　；参考：《中国安全科学学报》2015年09期

【摘要】：为简单、准确地测定和计算煤粒瓦斯扩散系数,依据相似理论,从扩散方程中推导出相似准数,建立该相似准数与解吸率的回归关系式,以此代替扩散第二定律在第一边界条件下的解析解,进而提出煤粒瓦斯扩散系数的计算方法。在此基础上,设计煤粒瓦斯扩散系数测定系统,并测定不同时刻、压力条件下的煤粒瓦斯扩散系数。最后,结合试验数据将新方法与其他煤粒瓦斯扩散系数计算方法进行对比。结果表明,煤粒瓦斯扩散系数是时间的函数,初期迅速减小,随后趋于稳定,扩散系数与时间关系符合负幂指数变化规律。通过对比表明,新方法可以弥补简化计算对结果造成的影响,且简便、可靠。
[Abstract]:In order to measure and calculate the coal particle gas diffusion coefficient simply and accurately, according to the similarity theory, the similar criterion number is deduced from the diffusion equation, and the regression relation between the similar number and desorption rate is established. Instead of the analytical solution of the second law of diffusion under the first boundary condition, a method for calculating the diffusion coefficient of coal particle gas is proposed. On this basis, a system for measuring coal particle gas diffusion coefficient is designed, and the coal particle gas diffusion coefficient under different pressure conditions is measured at different times. Finally, the new method is compared with other calculation methods of coal particle gas diffusion coefficient. The results show that the diffusion coefficient of coal particle gas is a function of time, which decreases rapidly at the beginning and then tends to be stable. The relationship between the diffusion coefficient and the time is in accordance with the law of negative power exponent. The comparison shows that the new method can make up for the effect of simplified calculation on the results, and it is simple and reliable.
【作者单位】：河南理工大学安全科学与工程学院;河南省瓦斯地质与瓦斯治理重点实验室———省部共建国家重点实验室培育基地;中原经济区煤层(页岩)气河南省协同创新中心;
【基金】：“973”项目(2012CB723103) 长江学者和创新团队发展计划项目(IRT1235) 国家“十二五”科技重大专项课题项目(2011ZX05040-005) 河南省高校科技创新团队支持计划(14IRTSTHN002) 高等学校博士学科点专项科研基金资助(20134116110006)
【分类号】：TD712.3

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