Abstract:

Gas-liquid multiphase flow frequently occurs in many industrial fields such as petroleum, chemical, power, metallurgy, and the online identification of its flow pattern and non-separation measurement of its flowrate are of great scientific and engineering significance. Since the thermophysical properties of gas phase and liquid phase are different, the change of the components of gas-liquid multiphase flow will cause the corresponding temperature response of the pipe wall heated by constant heat flow. Based on this phenomenon, our team proposed a thermal-diffusion measurement method to indirectly invert the flow pattern and the phase flowrates of the gas-liquid multiphase by the fluctuation of the temperature of the pipe wall, and the method was completely verified in the laboratory. This new method had the advantages of non-contact, radiation-free, low cost, real-time online, and no applied resistance, which helped the online monitoring and intelligent transformation of gas-liquid multiphase flow in industrial processes.

Key words: gas-liquid multiphase flow, non-contact measurement, thermal diffusion, flow pattern identification, flowrate measurement

摘要：

气液多相流广泛存在于石油、化工、动力、冶金等诸多工业领域，其流型的在线识别和流量的在线不分离测量具有重要的科学和工程意义。气相、液相的热物性不同，在外加热源条件下气液多相流的组分变化会使管壁产生对应的温度响应，本文介绍了本文作者课题组基于此现象提出的一种由管壁温度波动间接反演气液多相流流型和各相流量的热扩散式测量法，并已在实验室内完整验证。该方法是一种新型的多相流测量方法，具有非接触、无辐射、低成本、实时在线、无外加阻力等优点，助力工业过程气液多相流的在线监测与智慧化转型。

关键词: 气液多相流, 非接触测量, 热扩散, 流型识别, 流量测量