摘要
目的天然气能量计量的对象是其完全燃烧后产生的总热量,通常采用体积计量值与体积发热量相乘的方法确定天然气的能量值,而体积发热量取决于天然气的组成,即天然气中各组分的摩尔分数。多气源管网中天然气的组成通常随空间位置和时间变化,故管网的每个计量站都需要确定不同时刻输入或输出本站的天然气的体积发热量。国内长输管道的A级计量站均配置了在线气相色谱仪,可以分析天然气发热量,B级和C级计量站可使用仿真方法为天然气发热量赋值,从而降低配置气相色谱仪的投资与运行维护费用。方法依据面向能量计量的管网仿真理论基础,针对某多气源环状管网,分别使用TGNET和SPS仿真软件建立了具有天然气组分跟踪与发热量计算功能的运行仿真模型。为提高仿真结果准确性,基于历史运行数据校准了仿真模型的管段输气效率这一关键参数。结果分别应用TGNET和SPS模型对该管网持续48 h的历史运行过程进行了动态仿真,TGNET模型的发热量仿真结果与历史记录值的偏差在0.3%以内。结论基于运行仿真的多气源环状管网能量计量是一种可行的方法,研究成果为国内天然气能量计量的实施和推广提供了一种可操作的方法。
Objective The object of natural gas energy measurement is the total heat quantity generated after complete combustion.The energy value of natural gas is usually determined by multiplying the measured value of volume by the volume calorific value,and the volume calorific value depends on the composition of natural gas,that is,the mole fraction of each component in natural gas.The composition of natural gas in multi-gas source pipeline network usually changes with space position and time,thus each metering station of the pipeline network needs to determine the volume calorific value of natural gas input or output from the station at different times.Class A metering stations of long-distance pipelines in China are equipped with on-line gas chromatograph to analysis the calorific value of natural gas,while class B and class C metering stations can use simulation method to assign value to the calorific value of natural gas,so as to reduce the investment,operation and maintenance cost of configuring gas chromatograph.Methods Based on the theoretical basis of pipeline network simulation for energy measurement,aiming at a multi-gas source annular pipeline network,this paper establishes the operation simulation model with the functions of natural gas component tracking and calorific value calculation by using TGNET and SPS simulation software.In order to improve the accuracy of simulation results,the gas transmission efficiency of pipe section,a key parameter in the simulation model,is calibrated based on historical operation data.Results TGNET and SPS models are respectively used to dynamically simulate the historical operation process of the pipeline network for 48 hours.The deviation between the calorific value simulation result of TGNET model and the historical value is within 0.3%.Conclusions The energy measurement of multi-gas source annular pipeline network based on operation simulation is a feasible method.The research results provide an operable method for the implementation and popularization of natural gas energy measurement in China.
作者
黄维和
常宏岗
李姗姗
陈荟宇
席蔺璇
齐达
左丽丽
Huang Weihe;Chang Honggang;Li Shanshan;Chen Huiyu;Xi Linxuan;Qi Da;Zuo Lili(PetroChina Company Limited,Beijing,China;Research Institute of Natural Gas Technology,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan,China;Key Laboratory of Natural Gas Quality Control&Energy Measurement,CNPC,Chengdu,Sichuan,China;China University of Petroleum(Beijing),Beijing,China;National Engineering Laboratory of Pipeline Transmission Safety/Key Laboratory of Petroleum Engineering Ministry of Education/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,Beijing,China)
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2022年第5期117-123,共7页
Chemical engineering of oil & gas
基金
国家自然科学基金面上项目“复杂供气管网大时滞非线性仿真模型构建与智能调控”(52174064)
中国石油西南油气田公司院士工作站项目“管网仿真技术在天然气能量计量中应用研究”(XNS天研院JS2020-22)。
关键词
天然气
管网
运行仿真
能量计量
发热量赋值
natural gas
pipeline network
operation simulation
energy measurement
calorific value assignment
