超声测流装置的实验室测试与优化

为提高大口径管道流量在线校准的准确度,建立了一套多声道超声测流装置,对其现场探头定位安装及几何测量方法进行了优化,并在研究流量计算模型的基础上进行了不同探头插入状态的实验室测试。在DN400的管道上安装交叉4声道超声探头,测试了3种探头插入状态,通过分析流量测量误差来得到最优化方案。实验表明,探头插入状态显著影响装置流量测量误差,随着插入深度的增加流量测量结果逐渐增大,但即使全突状态流量依然偏小;3种状态中全缩线性较好,经过系数修正后,全缩状态下超声测流装置计量准确性最高,达到0.2级;超声测流装置经过实验室测试与优化,可以满足1.0级大口径管道流量在线校准的要求。

Laboratory Test and Optimization of Ultrasonic Flow Measurement Device

In order to improve the accuracy of online flow calibration for large diameter pipeline, a set of ultrasonic flow measurement device is established. The probe installation technical process and geometric parameter measurement method are optimized for practical use. The flow rate model is studied and flow rate calibration under different probe protrusion state is done in the laboratory. The configuration of double-plane 4-path is installed for a DN400 pipe, and three probe protrusion states are tested to get a best solution based on flow error analysis. The experiments shows that the probe protrusion state has a significant impact on the flow measurement error of the device, and flow measurement results increases with the increase of probe insertion depth. The full contraction state is with the best linearity, and the practical installation with this state can get the best flow measurement accuracy with 0.2 level after a coefficient correction. The ultrasonic flow measurement device can meet the accuracy requirements of online flow calibration for 1.0 level large diameter pipeline after laboratory optimization.