热式气体质量流量计动态响应的优化  

Optimization of Dynamic Response of Thermal Gas Mass Flowmeter

作　　者：刘家旭 徐英 张涛 王念榕 LIU Jiaxu;XU Ying;ZHANG Tao;WANG Nianrong(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory for Process Measurement and Control,Tianjin 300072,China;PetroChina Planning&Engineering Institute,Beijing 100083,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]天津市过程检测与控制重点实验室,天津300072 [3]中国石油规划总院,北京100083

出　　处：《传感技术学报》2021年第4期489-495,共7页Chinese Journal of Sensors and Actuators

基　　金：国家重点研发计划支持项目(2018YFF01013802);天津市自然科学基金支持项目(18JCZDJC31600)。

摘　　要：针对热式气体质量流量计测量过程中动态响应时间过长的问题,重点研究了在流量发生变化时探头及附近气体的传热机理,得出了响应过程中的时间常数随质量流量变化的规律,总结出了时间常数的数学模型。将时间常数随质量流量变化的规律与流量计实时的测量值进行迭代,在热式测量流量值稳定之前,提前预测出稳态时的质量流量。通过实验证实了上述模型和方法,提前预测出稳态时的流量,在质量流量在55 kg/h~287 kg/h范围内,能够使响应时间缩短了80%~90%。Aiming at the problem of excessively long dynamic response time during the measurement of thermal gas mass flow meters,the focus is on the heat transfer mechanism of the probe and nearby gas when the flow changes,and the law of the time constant changing with the mass flow during the response process,Summed up the mathematical model of the time constant.The law of the time constant changing with the mass flow rate is iterated with the real-time measured value of the flowmeter,and the steady-state mass flow rate is predicted in advance before the thermal measurement flow rate stabilizes.The above models and methods are verified through experiments,and the steady-state flow rate is predicted in advance.When the mass flow rate is in the range of 55 kg/h~287 kg/h,the response time can be shortened by 80%~90%.

关 键 词：热式气体质量流量计 测量 响应时间 预测 误差分析 

分 类 号：TH814[机械工程—仪器科学与技术]