气液两相流体流量或质量含气率的液体取样测量方法

A Method for Liquid Sampling and Measurement of Gas-liquid Two-phase Fluid Flow Rate or Mass Quality

从被测气液两相流体中取样分流出一部分单相液体,通过测量这部分单相液体的流量确定被测气液两相流体的流量或干度。通过将两相流体的测量转化为单相液体的测量,避免了两相流体的波动对测量精度的影响。分析表明:取样液相流量与主管路总流量的比值与主管质量含气率成线性关系。如果已知质量含气率或质量流量其中一个参数可以确定另一个参数。设计了液体取样装置,在气液两相流实验环道上进行实验。结果表明:本实验范围内,流量和质量含气率测量最大误差小于10%。

A portion of single-phase liquid is sampled and separated out from the gas-liquid two-phase fluid under measurement.Through the flow rate measurement of this portion of the single-phase liquid,the flow rate or dryness fraction of the two-phase fluid can be determined.Through a conversion from the measurement of a two-phase fluid to that of a single-phase liquid,the effect of two-phase fluid fluctuation on measurement accuracy can be avoided.The analytic results show that the ratio of the sampled liquid phase flow rate and the total flow rate in the main pipeline assumes a linear relationship with the mass quality of the main pipeline.If either one parameter of the mass quality or mass flow rate is known,the other parameter can be determined.A liquid sampling device has been designed and tested on a gas-liquid two-phase flow test loop.The test results show that within the range of the present test,the maximum measurement error of a flow rate and mass quality is less than 10%.