作者：印小娜1, 李长俊1, 谢萍2, 伍奕2, 贾文龙1
作者单位：1. 西南石油大学石油与天然气工程学院，四川 成都 610500;
2. 国家管网集团西部管道公司，新疆 乌鲁木齐 830001
关键词：误差分析;超声波流量计;仿真;混氢天然气
摘要：
由于氢气和天然气物性存在较大的差异，将氢气混入天然气管道中会改变管道内气体气质和流体流动状态，影响超声波流量计计量精度。为分析氢气混入到天然气管网中对超声波流量计计量精度影响，根据超声波流量计工作原理，考虑混入氢气后声道上气体声速及流速变化，采用微积分思想建立超声波流量计算模型。利用FLUENT软件模拟计算，分析氢气和天然气混合规律，通过计量误差分析，评价混入氢气后对超声波流量计计量精度的影响。根据仿真结果，超声波流量计不适用于非均匀混合气体的计量；利用氢气和甲烷密度差异，将氢气从管道底部注入可以减短混合距离管段，并给予推荐安装位置，为计量的准确性提供参考。
Research on adaptability of ultrasonic flowmeter for hydrogen–natural gas mixtures in natural gas pipelines
YIN Xiaona1, LI Changjun1, XIE Ping2, WU Yi2, JIA Wenlong1
1. Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China;
2. Western Pipeline Company of National Pipe Network Group, Urumqi 830001, China
Abstract: Due to the large difference in the physical properties of hydrogen and natural gas, mixing hydrogen into natural gas pipeline will change the physical properties and flow conditions of natural gas in the pipeline, and affect the measurement accuracy of the ultrasonic flowmeter. In order to research on measurement accuracy of the ultrasonic flowmeter for hydrogen–natural gas mixtures in natural gas pipelines, according to the working principle of the ultrasonic flowmeter, considering the changes in the sound velocity and flow velocity of the gas on the channel line after the hydrogen is mixed, the calculus idea is used to establish an ultrasonic flow calculation model. Use FLUENT software to simulate the mixing law of hydrogen and natural gas, and evaluate the influence of mixing hydrogen on the measurement accuracy of the ultrasonic flowmeter through measurement error analysis. According to the simulation results, the ultrasonic flowmeter is not suitable for the measurement of heterogeneous mixed gas; considering the difference in density of hydrogen and methane, injecting hydrogen from the bottom of the pipeline can shorten the mixing distance, and recommend the installation position to provide a reference for the accuracy of measurement.
Keywords: error analysis;ultrasonic flowmeter;simulation;hydrogen–natural gas mixtures
2021, 47(8):150-158 收稿日期: 2020-09-06;收到修改稿日期: 2020-10-24
基金项目: 国家自然科学基金项目（51674213）
作者简介: 印小娜(1995-),女,浙江宁波市人,硕士研究生,专业方向为油气储运系统仿真与优化
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