开发用于模拟大规模复杂天然气管网的分段方法

IF 4.8 Q2 ENERGY & FUELS
Duihong Zhang , Yi Yang
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引用次数: 0

摘要

到 2025 年,中国天然气管道总里程预计将达到 16.3 万公里,这对日益大型化、复杂化的管网模拟技术提出了迫切要求。本文介绍了一种基于优化策略的新型分段方法,用于大规模复杂天然气管网的仿真。在分析拓扑结构的基础上,根据相邻管道之间的连接节点,将整个管道网络分解为多个子网络。然后,在等温模式下,通过最小化连接节点处的连续性和动量守恒的残差来实现分段方法。更新连接节点处的水力变量后,即可获得每个子网络中的水力变量。通过三个不同的测试案例与商业软件进行比较,证明了这种分段方法的计算精度和效率。结果表明,所开发方法的最大压力相对偏差与使用商业软件计算的压力相对偏差在 2.5%以内。在空间步长可变的 5 × 104 km 测试案例中,计算效率是商业软件的 2.1 至 3.2 倍。三个案例研究的结果表明,这种分段方法很有前途,适合应用于大规模复杂天然气网络模拟。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of a sectionalizing method for simulation of large-scale complicated natural gas pipeline networks
By 2025, the total mileage of natural gas pipelines in China is expected to reach 163,000 km, placing urgent demands on the simulation technology for increasingly large-scale and more complicated pipeline networks. This paper describes the development of a new sectionalizing method, which is based on optimization strategy, for simulating large-scale and complicated natural gas pipeline networks. Based on analysis of the topological structures, the entire pipeline networks are decomposed into multiple sub-networks according to the connecting nodes between the adjoined pipelines. The sectionalizing method is then implemented by minimizing the residuals of conservation for continuity and momentum at the connecting nodes in isothermal mode. The hydraulic variables in each sub-network are obtained after the hydraulic variables at connecting nodes are updated. The calculation accuracy and efficiency of this sectionalizing method are demonstrated by comparison with a commercial software through three different test cases. It is shown that the maximum relative deviation of pressure of the method developed is within 2.5% of that calculated using the commercial software. In a 5 × 104 km test case with variable spatial step sizes, the computational efficiency is 2.1 to 3.2 times of that of the commercial software. The results of the three case studies suggest that this sectionalizing method is promising and suitable for application to large-scale complicate natural gas network simulation.
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CiteScore
7.50
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