输气管道末段储气能力稳态计算法偏差分析

末段储气是输气管道短期调峰的手段之一,其效果与末段储气能力密切相关。采用稳态计算法估算输气管道末段的储气能力,往往与实际值存在一定偏差,根本原因在于其忽略了管道终点流量随时间的变化。针对极限工况和3种较典型的管道终点流量随时间的变化规律,采用管道仿真软件SPS对输气管道末段运行过程进行动态仿真,从而较准确地计算输气管道末段的储气能力。结果表明：由稳态法估算的末段储气能力比动态仿真结果偏低15%~25%,说明相关文献给出的10%~15%的偏差范围不具有普遍性。

Deviation analysis of steady-state calculation for gas inventory capability in terminal pipe

Gas inventory in terminal pipe is one of the short-term peak shaving scenarios of gas pipelines, which depends on the capacity of gas inventory of terminal pipe. Gas inventory capacity in the pipe estimated by steady-state calculation often has certain deviation from actual value, the basic reason is that the calculation method neglects the variation of final flowrate of pipeline with time. For limit conditions and three typical change laws of flowrate at end pipeline against time, dynamic simulation on running process of terminal pipe is carried out with SPS software to accurately calculate the gas inventory capacity in terminal pipe. Results show that the inventory capacity in terminal pipe with stable-state calculation method is 15% to 25% lower than dynamic simulation, which indicates that 10% to 15% deviation given by related documents does not have generality.