基于三轴加速度探头的涡街湿气分相流量测量

Gas and liquid flow measurement by vortex metering in wet gas based on three-axis acceleration probe

针对涡街湿气测量过读问题,提出了基于加速度检测的涡街过读校正和分相流量测量方法。设计了高频响三轴加速度探头,分别对敏感元件、探头尺寸和封装进行了优化设计。干气标定结果表明,在4.43×10^(4)~1.81×10^(5)雷诺数范围内,测量精度为±1.0%,线性度为1.06%。然后,在不同湿气工况(载气压力和流量、液相流量)下测试了输出频率和加速度幅值特性,以气、液相韦伯数为参数,分别建立了涡街过读和两相加速度幅值模型。最后,联立两方程建立了湿气测量模型,并利用牛顿迭代算法进行求解。预测结果表明,气相测量误差在±1.0%以内,不确定度0.46%,液相全量程误差在±15%以内,不确定度10.04%。与未过读校正时最大8%的测量误差相比,气相测量精度大大提升,同时实现了湿气中分相流的在线测量。

To address the problem of vortex metering in wet gas, the overreading correction and wet gas flow measurement method are proposed, which is based on acceleration detection. The high-frequency response three-axis acceleration probe is designed, and the sensing element, probe size and its package are optimized. The calibration results in dry gas show that the metering accuracy is ±1.0% and the linearity is 1.06% in the Reynolds number range of 4.43×10^(4)~1.81×10^(5). Then, the tests are implemented on various wet gas conditions(carrier gas pressure and flowrate, liquid flowrate), and the output frequency and acceleration amplitude are acquired. The models of meter overreading, and the acceleration amplitude are established with the gas and liquid Weber numbers, respectively. Finally, the wet gas flow measurement model is formulated by the simultaneous equations, and solved by using the Newton iteration algorithm. The test results show that the gas prediction error is within ±1.0% with uncertainty of 0.46%, and full-scale prediction error for liquid flow within ±15% with uncertainty of 10.04%. Compared with the error up to 8% by the traditional method, the accuracy of wet gas metering is largely improved. Both the gas and liquid flows can be tested online.