作者：王海同¹, 方立德¹, 李春辉², 陈文琳³

作者单位：1. 河北大学，河北 保定 071002;
2. 中国计量科学研究院，北京 100029;
3. 新疆维吾尔自治区计量测试研究院，新疆 乌鲁木齐 830011

关键词：天然气;超声流量计;声速;气体分子量;不确定度

摘要：

超声流量计可以实现当地声速的直接测量，声速与气体分子量存在定量关系，而分子量大小取决于气体组分。因此，可利用超声流量计实时测量得到的声速实现对天然气组分的间接核查，这对完善天然气能源计量体系具有至关重要的作用。该文分析声学法测量气体分子量的理论基础；以超声流量计为主体搭建声学法测量气体分子量的实验装置；并以氮气为实验介质，对实验装置声速测量的不确定度进行初步分析。研究结果可为声学法测量气体分子量在天然气能量计量中的应用提供理论依据和数据支撑。

Preliminary study on measurement of gas molecular mass based on acoustic method
WANG Haitong¹, FANG Lide¹, LI Chunhui², CHEN Wenlin³
1. Hebei University, Baoding 071002, China;
2. National Institute of Metrology, China, Beijing 100029, China;
3. Xinjiang Uygur Autonomous Region Research Institute of Measurement and Testing, Urumqi 830011, China
Abstract: The local sound speed can be directly measured by the ultrasonic flowmeter. There is certain relationship between sound speed and the gas molecular mass determined by its components. So, the sound speed measured by the ultrasonic meter can be used to indirectly verify natural gas components, which takes an important role in energy determination of natural gas. In this paper, the theoretical analyses were conducted on the measurement of the molecular mass with acoustic method. The experimental equipment for measuring the molecular mass with an ultrasonic flowmeter as the main body was built. The uncertainty of sound speed measurement in the experimental equipment was analyzed on the basis of the measuring results of nitrogen. The results of this paper provide theoretical basis and data support for the application of acoustic measurement of molecular mass in the natural gas energy metrology system.
Keywords: natural gas;ultrasonic flowmeter;sound speed;gas molecular mass;uncertainty
2021, 47(4):1-6,13  收稿日期: 2020-06-10;收到修改稿日期: 2020-08-01
基金项目: 国家重点研发计划重点专项资助（2017YFF0205305）
作者简介: 王海同（1994-），男，河北张家口市人，硕士研究生，专业方向为气体流量计量
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