Reliability of Vortex Flowmeters in Trade Measurement

       Vortex flowmeters can indeed be used in trade measurement, especially playing a significant role in steam trade measurement. The following is a detailed analysis of the application of vortex flowmeters in trade measurement:

1. Principles and Advantages of Vortex Flowmeters

      Vortex flowmeters are flowmeters based on the Karman vortex street principle. They work by setting a vortex generator in the fluid, causing the fluid to alternately separate and release two rows of regularly arranged vortices on both sides downstream of the vortex generator. The frequency of these vortices is proportional to the flow velocity of the fluid, and thus the flow rate of the fluid can be determined by measuring the frequency of the vortices. Vortex flowmeters have the following advantages:

High measurement accuracy: The vortex separation frequency of vortex flowmeters is proportional to the volume flow rate and is not affected by fluid composition, density, pressure, or temperature. Therefore, they have the characteristic of precise flow signals throughout the entire measurement range.

Simple compensation calculation: Parameters such as steam density, gas density, and compression coefficient can be compensated for by measuring temperature and pressure, and the calculation formulas are all national or international standards, ensuring high calculation accuracy. 

Easy Fault Analysis: The vortex flow signal is in digital frequency form. Under normal circumstances, the vortex separation frequency is stable. Once the sensor malfunctions or the working conditions change, the vortex separation frequency will change significantly, making it easy to analyze whether the sensor has a fault.

2. Application of Vortex Flowmeters in Steam Trade Measurement

    Vortex flowmeters are widely used in steam trade settlement in thermal power plants, especially suitable for medium and small-sized users with gas supply pipe diameters not exceeding DN300mm. In steam trade measurement, vortex flowmeters can provide high-precision flow measurement, ensuring the interests of both trading parties.

3. Precautions for Use

    When using vortex flowmeters for trade measurement, the following points should be noted:

Selection and Design: The appropriate model and specification of the vortex flowmeter should be selected based on the actual measured medium, flow range, pipe size, and other factors.

Installation Requirements: The installation of vortex flowmeters should comply with relevant standards and regulations, ensuring there is sufficient straight pipe section before and after the flowmeter to reduce measurement errors.

Regular Verification: As a trade settlement metering device, vortex flowmeters must be verified periodically in accordance with national regulations to ensure the accuracy and reliability of the measurement results.

Environmental Factors: Vortex flowmeters should be installed as far as possible away from environments with strong vibration, electromagnetic interference, and other adverse conditions to reduce the impact of external factors on the measurement results.

Summary: Due to its advantages such as high precision, easy compensation, and easy analysis, the vortex flowmeter has significant application value in steam trade measurement. However, during use, attention should be paid to issues such as selection and design, installation requirements, regular verification, and environmental factors to ensure the accuracy and reliability of the measurement results.

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