输气管线末端管存量影响因素分析
The Analysis for Gas Inventory Influence Factors in Terminal Pipe

天然气长输管线下游市场用气具有不均匀性，使得调峰的要求越来越高，目前我国天然气长输管线调峰主要还是依靠长输管线末端管存量调节，故很有必要对不同压力、管径管存量的影响因素进行定性的研究并总结规律。本文中基于陕京一线西气东输一线的设计参数用SPS仿真软件建立一管段，并仿真出不同管段长度、起点压力、管径、输气量以及高程差计五个因素的管存量并总结规律。规律显示：起点压力、管段长度和管径对管存量影响较大，而管输量与高程差对管存量影响较小；管线设计参数等级不同时，相同影响因素下管存量变化速率不一样。这些规律将会有助于判断不同设计参数天然气末端管段的管存量，继而对天然气长输管线下游用气调峰提供有效的帮助。
The inhomogeneity of the long-distance gas pipeline downstream gas market makes the demand of the downstream gas peaking more and more increasing, China mainly use gas inventory in terminal pipe adjust the peak of the long distance gas pipeline downstream, therefore it is necessary for qualitative study gas inventory influence factors of different pressure and diameter and the summary the rules. The author establishes a pipe section by SPS simulation software base in the design parameters of the line-1 of shaanxi-Beijing and line-1 of West-East in this paper and simulates the gas inventory of the pipe section with the change of the influence factors, such as the length of the pipe section, the starting pressure of the pipe section, the pipe diameter, the flow and the elevation difference, and analysis the influence of each factor for gas inventor and summary the rules. The rules show that length of the pipe section, the starting pressure of the pipe section and the pipe diameter have a greater influence for the gas inventory, and the flow and the elevation difference have less influence for the gas inventory. When the pipeline design parameters are not at the same, the change rate of the gas inventory is not the same under the same influence factor. These rules will play an important role in fixing the gas inventory of natural gas pipe section with different pressure and diameter, and provide effective help to the peak of the long distance gas pipeline downstream.