DN100气体超声流量计管道配置对计量性能影响研究

随着气体超声流量计技术水平日趋成熟,国内外相关标准对管道配置的要求经历了数次变化。由于现场可能存在阻流件干扰,为研究不同管道配置对小口径超声流量计的计量性能影响,考察了不同直管段长度在复杂工艺条件下对不同型号超声流量计的适用性,开展了DN100超声流量计与标准装置的测试实验。结果表明,安装流动调整器后,在前直管段为30D的基础上缩短长度至20D,对流量计性能不产生明显影响,继续缩短直管段长度时,计量最大偏差可达1.5%,反映了直管段长度对计量性能的影响程度,为使用小口径超声流量计的中低压贸易交接场站性能评价提供参考。 

Influence of DN100 ultrasonic flowmeter pipeline configuration on metering performance

With the maturity of gas ultrasonic flowmeter technology, the requirements of domestic and foreign standards for pipeline configuration have experienced several changes. In order to study the influence of different pipeline configurations on the metering performance of small diameter ultrasonic flowmeter, and to study the applicability of straight pipe length recommended in the standard to different types of ultrasonic flowmeter under complex process conditions, test experiments were carried out between DN100 ultrasonic flowmeter and standard device under different pipeline configurations. The results show that it has no obvious impact on the flowmeter performance by further shortening the length of upstream straight pipe to 20D on the basis of 30D after installing the flow regulator. When the length of straight pipe continues to be shortened, the maximum deviation of the flowmeter will be up to 1.5%. The experiments reflect the influence degree of the length of straight pipe on the metering performance, which can provide a reference for the performance evaluation of medium and low pressure trade transfer stations using small diameter ultrasonic flowmeter.