| The multi-phase flow phenomenon exists widely in nature and lives. The betterunderstand of multi-phase flow mechanism promotes the development of nationaleconomy. The study of multi-phase flow can be divided into the theoretical researchand experimental research, and both of them need the support of multi-phase flowexperimental device.Some indroduction and analysis of the structure and running status of theoil-gas-water multi-phase flow experimental device in Tianjin key laboratory ofProcess Measurement and Control has been made. It includes stabilized power supplyfor each phase, pipeline system, and control system and so on. The existing problemsof the device have been analysed and the solutions have been proposed based on themulti-phase flow research development and the experiment requirement.First of all, some improvement of pipeline system has been made. Small flow ratemeasurement pipelines have been installed according to the requirement of flow ratetop and bottom limitation of the multi-phase flow experiment. Several temperaturesensors and pressure transmitters have been installed on the experimental pipelines.Then, the type selection, installation and debugging of all the control valves on thepipelines have been made. Some key hardwares have been updated, like IndustrialPersonal Computer (IPC), control cabinet, air compressor, etc., and the hardwarestructure of control system has been rebuilt and improved. The interference problemof signal transmission has been improved greatly. The control configuration softwareand the control program has also been redesigned and reprogrammed. Furthermore,the operation sequence of the new system has been made in detail.The debugging and oil/gas/water single phase circulation running test have beenmade by the oil-gas-water t multi-phase flow experimental device after thetransformation. The lower limit of water phase measurement is0.0018m3/h, and thelower limit of oil phase measurement is0.005m3/h. According to the transformation,the transmission of signal and power is more stable, the measurement accuracy ishigher, the layout of control cabinet is more reasonable, the utilization of controlresource is more orderly, the operation is more safe and effective, and the resource hasbeen reserved for the further improvement and update.The gas-water two-phase flow pattern experiments in horizontal/vertical/inclined experimental pipelines have been made for verification. In addition, anotherreplication experiment of long-waist cone flow meter has also been made inhorizontal experimental pipelines. The calibration of discharge coefficient with oil andwater has been used to test the result of single phase running and measurement, andthe measurement of mass flow rate of oil-water two-phase flow has been used to testthe result of two-phase running and measurement.The results of the experiment show that the oil-gas-water multi-phase flowexperimental device can complete the experiment task accurately, quickly andeffectively after the transformation. It has reached the intended target. |
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