基于仿真模型的复杂管网计量方法及应用

Measurement method and application of complex pipe network based on simulation model

为实现天然气管网从体积计量转为能量计量,减少计量站设置在线色谱仪的数量,降低投资和运行成本。基于TGNET软件建立了复杂环状管网模型,通过设置合理的初始条件和边界条件,实现了不同节点、不同时间组分浓度及发热量的赋值,并通过稳定条件下的运行结果对模型实施校准,最后对比了能量计量和体积计量的销售价格差异。结果显示,仿真模型对稳定条件及气质浓度变化条件时,具有良好的适应性,可以真实反映分输用户处的组分浓度;发热量赋值方法中ISO 6976法较平均摩尔法的准确度更高,相对误差范围更小;多气源分输用户较单气源分输用户相比,发热量的赋值结果存在一定误差。研究结果可为能量计量和计价的尽快实施提供实际参考。

In order to realize the conversion of natural gas pipe network from volume measurement to energy measurement,the number of online chromatographs installed in metering stations is reduced,and the investment and operating costs are reduced.The complex ring pipe network model is established based on TGNET software.By setting reasonable initial and boundary conditions,the component concentrations and calorific value are assigned at different nodes and at different times.The model is calibrated by running results under stable conditions,and the difference in selling price between energy metering and volume metering is compared.The results show that the simulation model has good adapt ability to the stable condition and the changing condition of temperament concentration,and truly reflects the component concentration at the user.Among the calorific value assignment methods,ISO 6976 method has higher accuracy and smaller relative error range than average mole method.There are some errors in the calorific value assignment for users with multiple air sources compared with users with single air sources.The research results can provide practical reference for the implementation of energy measurement and pricing as soon as possible.