考虑互换性的混合气源天然气管网扩建工程设计优化

Design Optimization of Mixed Gas Source Natural Gas Pipeline Network Expansion Project Considering Interchangeability

面对逐渐形成的混合气源协同供应天然气管网格局,扩建现有天然气管网已成为未来发展趋势。针对混合气源的管网扩建工程设计优化问题,综合考虑混合气源带来的燃气互换性和成本等影响,以管网扩建年折合费用最低为目标函数,建立通用的混合气源天然气管网扩建设计优化的混合整数非线性规划(mixedintegernon-linearprogramming,MINLP)模型。以某沿海城市群为例进行研究,提出考虑互换性与不考虑互换性的2种情景以及气源不同价格组合下的25种情景,采用数学规划求解器DICOPT求解。分析发现,互换性主要影响各气源在混合时的供应比例,考虑互换性时管网扩建年折合费用虽然比不考虑高,但提高了用户用气安全性和稳定性。因此在实际管网扩建设计中,应综合考虑各气源互换性和价格水平的影响,制定合理的管网规划。

Facing the emerging pattern of a mixed gas source collaborative natural gas pipeline network,the expansion of the existing natural gas pipeline has become a trend for future development.We focus on the optimization of pipeline expansion project design for mixed gas sources.Consider the interchangeability of gas from mixed sources,as well as the impacts on cost,a general mixed integer non-linear programming(MINLP)model targeting the lowest annual equivalent cost of network expansion is established.A study is conducted using a coastal urban cluster as an example.Two scenarios are proposed:one considering interchangeability and the other without,along with 25 scenarios under different gas source price combinations.The DICOPT mathematical programming solver is employed for solutions.Analysis reveal that interchangeability primarily affects the supply ratio when gases are mixed.Although the annual equivalent cost of network expansion considering interchangeability is higher than not considering it,it enhances user gas safety and stability.Therefore,in actual network expansion design,the impact of gas source interchangeability and price levels should be holistically considered to formulate rational network planning.