摘 摘 要：用来测量气体和蒸汽流量的流量计，除了个别原理的流量计之外，都需进行流体温度、压力补偿。由于 流体种类的不同，补偿的目的也不尽相同。由于温度和压力的变化，对各种不同原理流量计的影响不相同，所以 测温点位置和测压点位置也有不同的要求，只有合理确定这些位置，才有可能进行准确的补偿。然而，深入流量 测量仪表使用现场，你会发现，这种用途的测温口测压口所选位置五花八门，差异悬殊。这种悬殊都对测量结果 产生影响。本文在阐述涡街流量计、差压流量计等几种流量计工作原理之后，分析了几种流量计温度、压力补偿 的目的和温度、压力参数的测量要求，进而提出了测温口、测压口开口位置的合理选择。还提供了利用焦耳-汤姆 逊系数计算上下游温差的实例。 关键词：温压补偿 测压口 测温口 涡街流量计 差压流量计 焦耳-汤姆逊系数 Design of Temperature and pressure compensation measuring points for flow measurement Zhu binfeng Jacobs engineering (Suzhou) Co., Ltd. Shanghai branch(shanghai 200070) Ji bofeng, Ji gang Shanghai tontion automation instrumentation Co., Ltd.(shanghai 200070) Abstruct: Flowmeters used to measure gas and steam flow require fluid temperature and pressure compensation except few flowmeters. Due to the different types of fluids, the purpose of compensation is not same. Due to changes in temperature and pressure, the effects on the flowmeters of different principles are different, so the position of the temperature and pressure measurement point are different too. Accurate compensation is only possible if these positions are reasonably determined. However, if you go to the working site, you will find that the temperature and pressure measurement points of this type has a wide selection of different positions. This affects the measurement results. After describe the working principle of several flowmeters such as vortex flowmeter and differential pressure flowmeter, this paper analyzes the purpose of temperature and pressure compensation of several flowmeters and the measurement requirements of temperature and pressure. Furthermore, a reasonable choice of the temperature and pressure position is proposed. An example of calculating the temperature difference between upstream and downstream using the Joule-Thomson coefficient is also provided. Keywords: temperature and pressure compensation temperature measuring point pressure measuring point vortex flowmeter differential pressure flowmeter Joule-Thomson coefficient 1. 概述 在气体流量测量中，除了热式质量流量计等之外，一般都要进行温度压力补偿。 在蒸汽流量测量中，也都要进行温度压力补偿。 虽然笼统地说，都称为温度压力补偿，但补偿的意义却不尽相同。 不同原理的流量计，流体温度和压力的变化，对测量结果的影响各不相同，因此，在测得流 体的温度和压力后，要按规定的关系式进行补偿。 流体在管道内流动，由于流量传感器、各种阻流件的影响，在管道的不同部位测得的温度压 力值也会有很大差异，所以，用作流量测量温度压力补偿的测量点的位置，也有明确规定，不能 随意确定。 下面以几种典型流量计为例，论述流量测量中温度压力检测点设计中的有关问题。
