天然气长输管道管存计算方法研究

目前,大多数管存计算公式采用稳态方法,精度较低。为精确计算管道管存,应精确计算存气管道气体温度、压力及压缩因子。文中将管段内气体由起点至终点参数动态变化看作一个多变指数为n的热力学参数变化过程,依据气体流动状态方程、运动方程推导出新的管存计算公式,计算过程采用分段计算累加的方法。经实例计算,与其他计算公式及TGNET软件模拟结果进行对比,推导公式计算精度较高。

Calculation Method Analysis of Stock Volume of Long Distance Natural Gas Pipeline

At present , most of stock volume calculation formula adopts steady state method , and the accuracy is relative low.In order to calculate the stock volume of pipeline accurately , the gas temperature , pressure and compression factor of the gas pipeline should be calculated precisely .In this paper , the parameters dynamic change of gas stocked in the pipeline ( from start-ing point to the end point ) were considered as changing process of thermodynamic parameters with polytropic exponent of n.Ac-cording to the gas state equation of flow and the equation of motion , new volume calculation formula was deduced .The calcula-tion process adopted the method of subsection computing accumulation .By practical calculation , comparing with results calculated by other calculation formula and TGNET software simulation , computational accuracy of the derived formula is relative high.