Brief introduction of comparison between vortex flowmeter and orifice flowmeter
1. Current technical level of vortex flowmeter and orifice flowmeter
The basic structure of the vortex flow main consists of vortex generators, detection components, and signal processing amplifier circuits. At present, the research on vortex generators has reached a fairly complete level, with triangular generators as the best type and detection components There are thermistors, strain gauges, piezoelectric crystals, differential capacitors, ultrasonic waves, etc. Many signal processing parts have been computerized. The vortex flowmeter has the advantages of easy installation (can be directly installed on the pipeline), small volume, strong interchangeability, and high long-term operation accuracy, and can be applied to most liquid, gas and vapor measurements. At present, the sales of vortex flowmeters in the world market are increasing by about 30% every year.
Due to the advantages of simple structure, low cost, and reliability, the orifice throttling device is suitable for almost all media measurement, and the differential pressure transmitter supporting it has developed rapidly, making its own deficiencies compensated.
2. Comprehensive performance evaluation of vortex flowmeter and orifice flowmeter
The orifice flowmeter (orifice Plate for short) is composed of a pressure-receiving device of a throttle and a differential pressure transmitter. The pressure-guiding pipe needs heat tracing measures for places that are easy to freeze. The static sealing point of a flow measurement circuit is about 20. There are the following problems in use:
Easy to freeze, easy to block, easy to leak, and heat tracing can easily cause the aging of the differential pressure transmitter device. In some occasions, the pressure guide tube needs to be added with isolation liquid. Due to heat tracing or unstable process operation, the positive and negative pressure guide tubes isolate liquid The lines are often unequal, resulting in a liquid column difference, making the flow indication inaccurate.
The above will cause the flow coefficient to change, reduce the measurement accuracy, shorten the tube and guide the pressure tube to install the differential pressure transmitter directly on the pipeline, but there is still a dead zone of flow.
The Vortex Flowmeter (Vortex Street for short) has only 3 static seal points, which is not easy to leak, has no flowing dead zone, does not need heat tracing and insulation, and is not affected by fluid gravity, temperature, pressure, and viscosity. The flow coefficient remains unchanged for a long time. .
However, when the vortex street is used in vibration, it will make the flow measurement inaccurate. At present, anti-vibration vortex has been launched on the market to overcome the impact of vibration on the inaccurate flow measurement.
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