Designing Of Multiphase Flow Experimental System And Ultrasonic Measuring Of Phase Hold-up

As a complicated flow phenomena,multiphase flow widely exists in industry fields of petroleum,chemical,metallurgy,power and energy.It is meaningful for related industry development to carry out multiphase flow research.As an important basic equipment in scientific research,the design and application of multiphase flow experimental devices have always played an crucial role in the development of multiphase flow research.The construction and development of experimental devices provide research platform and verification means for the discovery of multiphase flow mechanism and flow process parameters obtaining.As an important parameter of multiphase flow phenomena,phase holdup accurately obtaining lays the foundation for optimization of the production process and accurate measurement of other parameters.In order to establish perfect platform and condition for multiphase flow phenomena researching,according to the requirement of multiphase flow test technology research and experiment process,a miniaturized oil/gas/water multiphase flow experimental decices with computer automatic detection function is designed.A set of ultrasonic testing system based on FPGA technology is designed and experimentally verified on the multiphase flow experimental device.The main research work includes:(1)Aiming at solving the problems of expensive,high energy consumption and in convenient use of conventional multiphase flow experimental device,A miniaturized multiphase flow experimental device with computer automatic detection function was designed.It consists of the designing of structure and function of experimental device parts,such as storage tank,power source,measuring instrument and experimental tube.In the meanwhile,PC and data acquisition card driver was developed to realize the communication,and interactive interface was compiled to observe data.(2)Aiming at solving the problem that the pulse echo method is insensitive to the change of phase interface and poor accuracy,analyzed the influence of probe installation ways,installation quantity and different interface shape for quality of pulse echo information using numerical simulation technology,and proposed improved pulse echo method improved the accuracy of phase holdup measurement.(3)Based on the improved method of phase holdup measurement,a set of ultrasonic testing system based on FPGA technology is designed which mainly includes excitation module,switch module and data acquisition module.The experimental results show that the system can obtain phase holdup accurately.(4)On the basis of the realization of phase holdup ultrasonic testing system,the experimental testing and verification of the experiment were carried out by using the miniaturized multiphase experimental device.The performances and indexes of the multiphase flow experimental device are tested and evaluated.The system was tested under different flowing rates.