超临界二氧化碳流量测量方法研究  

Study on flow measurement of supercritical carbon dioxide

作　　者：罗凡[1] 蒋岳峰 甘蓉[1] 雷励[1] 赵宇轩 钟忠 LUO Fan;JIANG Yuefeng;GAN Rong;LEI Li;ZHAO Yuxuan;ZHONG Zhong(National Institute of Measurement and Testing Technology,Chengdu 610021,China;National Institute of Metrology,China,Beijing 100029,China;Southwestern Institute of Physics,Chengdu 610225,China)

机构地区：[1]中国测试技术研究院,四川成都610021 [2]中国计量科学研究院,北京100029 [3]核工业西南物理研究院,四川成都610225

出　　处：《中国测试》2024年第1期62-68,共7页China Measurement & Test

摘　　要：在临界点附近的超临界流体,操作温度或操作压力的微小变化,都会引起超临界流体密度的很大变化,因此,尚无能够满足实时、准确、可溯源要求的超临界流体流量测量方法及仪表。该文首先分析超临界二氧化碳在拟临界温度区域的物理特性;然后分别研究科里奥利质量流量计和差压流量计的超临界流体测量特点,确定流量测量所需的工况条件;最后提出一种以科里奥利质量流量计对差压流量计进行动态密度修正,从而提高超临界流体质量流量测量精度的流量计组合方法。验证实验中,该文以质量法液体流量标准装置对上述两种流量计进行校准,再基于雷诺数近似原理采用质量法气体流量标准装置进行模拟测试,评估动态响应能力及两种被测介质之间的测量误差。实验结果表明:该流量计组合方法具备超临界二氧化碳流量测量的能力,可实现以科里奥利质量流量计作为工作级标准的超临界二氧化碳量值溯源。Near the critical points,a slight disturbance in operating temperature or pressure will cause great changes in the density of supercritical fluids.Therefore,there are no real-time,accurate and traceable supercritical fluid flow measurement methods and instruments.In this paper,the physical characteristics of supercritical carbon dioxide in the quasi-critical temperature region are analyzed.Then the measurement features of Coriolis mass flowmeter and differential flowmeter in supercritical fluid are studied respectively,and the working conditions for measurement are determined.Finally,a new flowmeter combination method is proposed which correct the dynamic density of differential flowmeter with Coriolis mass flowmeter to improve the measurement accuracy of supercritical fluid.In the verification experiment,the above two flowmeters were calibrated with the standard facilities for liquid flowrate,and the evaluation of the dynamic response ability and the error between the two measured media were conducted with the gravimetric method gas flow standard device in terms of the Reynolds number approximation principle.The results show that this flowmeter combination method has the ability to measure supercritical carbon dioxide fluids and realizes traceability with Coriolis mass flowmeter as the master meter.

关 键 词：超临界二氧化碳 科里奥利质量流量计 差压式流量计 

分 类 号：TB937[一般工业技术—计量学]