基于仿真技术的天然气能量计量方法

Natural gas energy measurement method based on simulation technology

目的分析管网仿真技术在能量计量中的适用性,考查仿真计算结果与管网实测值的偏差。方法以一个多气源封闭天然气管网为例,依据面向能量计量的管网仿真理论基础,建立了具有天然气发热量、压力及流量计算功能的仿真模型。结果发热量仿真结果与现场色谱分析仪计算值的偏差在0.3%以内,满足GB/T 18603—2023《天然气计量系统技术要求》中赋值发热量最大允许误差的要求。压力仿真计算结果与现场压力变送器记录值的偏差在1.0%以内,流量仿真计算结果与现场流量计测量值的偏差在2.0%以内。结论基于管网仿真的管网能量计量技术用于复杂多气源管网的发热量赋值是一种可行的方法,该方法也可用于管网压力、流量和管存量的实时跟踪或核查。

Objective Analyzing the applicability of pipeline simulation technology in energy measurement,and examine the deviation between simulation calculation results and actual pipeline measurement values.Methods Using a closed natural gas pipeline network with multiple gas sources will be as an example,a simulation model with functions for natural gas heat generation,pressure,and flow calculation was established.This model is based on the theoretical foundation of pipeline network simulation for energy measurement.Results The deviation between the simulation results of heat generation and the calculated values of the on-site chromatographic analyzer is within 0.3%,which meets the requirements of the maximum allowable error of assigned heat generation in GB/T 18603—2023 Technical requirement of measuring systems for natural gas.The deviation between the pressure simulation calculation result and the recorded value of the on-site pressure transmitter is within 1.0%,and the deviation between the flow simulation calculation result and the measured value of the on-site flow meter is within 2.0%.Conclusions The energy measurement technology based on pipeline simulation is a feasible method for assigning heat generation values to complex multi-gas source pipelines.This method can also be used for real-time tracking or verification of pipeline pressure,flow rate,and natural gas pipeline inventory.