基于能耗指标对国内天然气管网的能耗分析

Analyses for energy consumption of domestic natural gas pipelines by using energy-consumption indexes

依据国内某大型天然气管网的相关参数,建立相对应的数据模型和管网结构模型,计算该天然气管网内4条管道的周转量、能耗率、单位燃动费等天然气管道运行评价指标,分析管网能耗变化情况,基于此,得出各管道以及整个管网合理的能耗率控制范围为能耗率小于2.5%、成本低于31×108元、单位燃动费低于200元/(107 m3·km)。最后,提出了具有可操作性的优化建议:新建枢纽站场尽量选择建设在管网下游,利用管道的大管径降低能耗,实现效益最大化;根据实际管网物理特点,将天然气管道划分为不同的管道系统,编制相应的优化方案,从而使管网的总能耗最低;在管网规划设计初期,综合考虑管网总体情况以及未来发展趋势,做到设计输量、布站选线具有一定的发展空间,降低综合成本。

By using relevant parameters of a large-scale domestic natural gas pipeline network, data model and structural model of the pipeline network have been established to calculate volume of the circular flow, energy consumption rate, unit fuel and power cost and other indexes for performance assessment of the four natural gas pipelines within the pipeline network and to analyze changes in energy consumption within the pipeline network. Assessment results show the rational energy consumption rate of various pipelines and the major pipeline network shall be maintained below 2.5%, whereas the cost shall be lower than RMB 31 × 10^8, and the unit fuel and power cost shall be RMB 200/（107 m^3.km）. Accordingly, practical proposals for optimization have been highlighted： new hub stations shall be constructed downstream of the pipeline network to reduce energy consumption and to achieve maximum economic efficiency by using the large-diameter pipelines; natural gas pipelines can be classified into different systems with their actual physical properties. In addition, corresponding optimization programs shall be prepared individually to reduce overall energy consumption of the pipeline network; during preliminary planning of the pipeline network, general conditions and future trends of the pipeline network shall be considered jointly to preserve necessary spaces for expansion of designed transportation capacity, station location and pipeline routing. In this way, overall costs can be reduced. （3 Figures, 4 Tables, 11 References）