基于门控循环单元的动态过程下两相CO_(2)质量流量测量  

Mass flowrate measurement of two-phase CO_(2) in a transient process using a gated recurrent unit neural network model

作　　者：丁宁 邵丁 闫勇[2] 张文彪[1] Ding Ning;Shao Ding;Yan Yong;Zhang Wenbiao(School of Control and Computer Engineering,North China Electric Power University,Beijing 102206,China;School of Engineering,University of Kent,Canterbury CT27NT,UK)

机构地区：[1]华北电力大学控制与计算机工程学院,北京102206 [2]英国肯特大学工程学院,坎特伯雷CT27NT,UK

出　　处：《仪器仪表学报》2021年第10期112-120,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(61973113,62073135);英国UKCCSRC、中央高校基本科研业务费(2020MS015)项目资助。

摘　　要：针对碳捕集与封存条件下科里奥利质量流量计测量气液两相CO_(2)动态过程质量流量时误差较大的问题,本文提出了一种基于门控循环单元(GRU)的动态过程下气液两相CO_(2)质量流量校正方法。利用GRU适合动态过程预测的特点,使用来自CO_(2)气液两相流实验平台的采集数据,对GRU网络模型进行训练,并使用网格搜索法结合K折交叉验证优化模型参数。使用八组典型工况下的测试集对优化后的GRU模型在测量精度和泛化性能方面进行了评估,并与最小二乘支持向量机(LS-SVM)模型进行了对比分析。实验结果表明GRU模型优于LS-SVM模型,并且GRU模型在动态波动发生后的平稳阶段,其输出结果能够快速跟随CO_(2)质量流量变化,相对误差在±5%以内。The transient process of gas-liquid two-phase CO_(2) flow can occur in carbon capture and storage pipelines.Large measurement errors exist when Coriolis mass flowmeters are used to measure the mass flowrate of CO_(2) under such conditions.To solve this problem,a method for mass flowrate correction based on a gated recurrent unit(GRU)neural network is proposed.Since the GRU is suitable for dynamic process prediction,the GRU model is trained by using the collected datasets from a CO_(2) gas-liquid two-phase flow rig and optimized by using a grid search method combined with the K-fold cross-validation.The optimized GRU model is evaluated in terms of measurement accuracy and generalization capability by using eight groups of datasets under typical experimental conditions.The GRU model is compared with the least squares support vector machine(LS-SVM)model.Experimental results show that the GRU model could achieve better results than the LS-SVM model.The output of the GRU model can follow the change of CO_(2) mass flowrate in the steady state after the transient process,and relative error is within±5%.

关 键 词：碳捕集与封存 质量流量测量 科里奥利质量流量计 气液两相CO_(2) 门控循环单元 

分 类 号：TH814[机械工程—仪器科学与技术] TP183[机械工程—精密仪器及机械]