Design And Development Of Single Straight Tube Coriolis Flowmeter

Coriolis flowmeter is widely used in the single-phase flow measurement in the production of petroleum,chemical,metallurgical and other industrial fields.In recent years,Coriolis flowmeter was used in the gas-liquid two-phase flow measurement,but the measurement results of the flowmeter are still not satisfied to meet the requirements of industry,the flowmeter could only be used in the experimental environment.There are many shapes of Coriolis flowmeter tube,including the single straight tube,which makes less effect on the fluid state.In this thesis,the structure and model of single straight tube Coriolis flowmeter were analyzed,and a single straight tube Coriolis flowmeter was designed and developed.The single-phase flow with air or water was measured correctly,and the vibration characteristics of two-phase flow were summarized through the two-phase flow experiment,which lay the foundation for the Coriolis flowmeter applied in the two-phase flow measurement.Around the development of the single straight tube Coriolis flowmeter,the following work has been carried out.An overview of Coriolis flowmeter was introduced firstly,which included the domestic and international development status,research and application of Coriolis flowmeter used in single-phase flow and gas-liquid two-phase flow measurement.And then the single straight tube was simplified as the Euler Bernoulli beam model,which was used for force analysis,calculating both the resonance frequency and the installation position of the sensors.Thirdly,the hardware including mechanical structure and circuit of Coriolis flowmeter was designed and developed.The connection of hardware was finished.After that,the online measurement software and offline signal processing method of Coriolis flowmeter were designed,which include vibration-start method,amplitude control,filtering and calculation method of frequency,amplitude,and phase difference.In addition,the results of the processing with different methods were compared and analyzed.Finally,the single-phase flow experiment and two-phase flow experiments were carried out,and the characteristics of single-phase and two-phase flow were analyzed through the analysis of the experiment results.