文丘里管实时多相流量计的微波探头传感定位
Microwave probe sensing location for Venturi-based real-time multiphase flowmeter
摘要：
流体物性的实时在线解释对于多相流测量是非常重要的。因此，希望有一种传感器，例如微波传感器，其可以连续地测量流的盐度。除了盐度测量之外，微波传感器还可以测量水分数，这是基于单能量伽马射线衰减的多相流量计所需的;然而，为多相流量计中的微波盐度传感器选择合适的探头感测位置可能是具有挑战性的，因为传感器需要位于近壁富液区域以适应广泛的流动条件。目前，微波传感器被安装在多相流量计的水平盲三通入口短管的下部区域中用于盐度测量。将微波传感器集成到垂直安装的多相流量计中可以减少流量计（碳）足迹和制造成本，并且由于更快的局部油-水混合而可以改善水-液比测量。相关的挑战是，传感器需要位于近壁富液区域，以适应各种流动条件，包括高气体体积分数流，其中垂直管道中存在的近壁液体层通常非常薄。在这项研究中，计算流体动力学建模被用来评估四个不同的传感位置沿垂直横截面的文丘里多相流量计的基础上，近壁液体丰富度的适用性。结果表明，在一定的进口液体体积分数范围内，文丘里进口比中间收敛段、中间发散段和文丘里出口更适合微波传感器测量。实验微波传感器测量多相流回路设施的研究结果已得到验证。
英文摘要：
Real-time in-line interpretation of liquid properties is important for multiphase flow measurements. Therefore, it would be desirable to have a sensor, such as a microwave sensor, which can continuously measure the salinity of a flow. In addition to salinity measurement, the microwave sensor can also measure water fraction, which is required for a multiphase flowmeter based on single-energy gamma-ray attenuation; however, choosing a suitable probe sensing location for a microwave salinity sensor in a multiphase flowmeter can be challenging, as the sensor needs to be located at near-wall liquid-rich region to accommodate a wide range of flow conditions. Currently, a microwave sensor is installed in the lower area of a horizontal blind-tee inlet spool of a multiphase flowmeter for salinity measurement. Integrating the microwave sensor into the vertically mounted multiphase flowmeter can reduce the flowmeter (carbon) footprint and manufacturing costs and can improve water-to-liquid ratio measurement due to faster local oil-water mixing. The associated challenge is that the sensor needs to be located at near-wall liquid-rich region to accommodate a wide range of flow conditions, including high gas-volume-fraction flows, where the near-wall liquid layer present in the vertical pipe is usually very thin. In this study, computational fluid dynamics modeling is used to evaluate the suitability of four different sensing locations along the vertical cross-section of a Venturi-based multiphase flowmeter based on near-wall liquid-richness. The results show that the Venturi inlet is the most suitable location for microwave sensor measurement, compared to the mid-convergence section, the mid-divergence section, and the Venturi outlet for a range of inlet liquid-volume-fractions. The findings have been validated by experimental microwave sensor measurements in a multiphase flow loop facility.
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