Power plant vortex flowmeter

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1. What flow meters are commonly used on steam pipelines? Vortex, orifice, bend, and electromagnetic flow meters are commonly used in steam pipelines. The core selection needs to be determined based on the steam state, pipe diameter, and operating conditions. 1. The vortex flowmeter is based on the Karman vortex principle and calculates the flow rate by detecting the vortex frequency generated when the fluid passes through the vortex generator. The structure is simple and has low pressure loss, with a wider range than orifice plates and an accuracy of 1.0 level. It is also suitable for saturated steam and superheated steam. Suitable for scenarios that require long-term stable monitoring and minimal pipeline vibration

2. The classic type of orifice flow meter differential pressure type is the flow data conversion method, which utilizes the pressure difference before and after the orifice plate to convert flow data. The biggest advantage lies in sufficient historical verification, complete support for international standards, and adaptability to large diameter (DN500 or above) steam pipelines. However, the throttling design can result in a pressure loss of up to 3-8kPa, and special attention should be paid to regularly cleaning the pressure tapping hole. The elbow flowmeter utilizes the physical characteristics of centrifugal force at the elbow to form a pressure difference between the inside and outside, which belongs to non-contact measurement methods. The absence of inserted components makes it stand out in steam containing impurities, especially suitable for high flow rate (≥ 35m/s) main steam pipelines in power plants. During installation, there is no need to stop cutting the pipeline, and the maintenance co

st in the later stage is relatively low. 4. The electric back magnetic flowmeter relies on Faradays law of electromagnetic induction and requires the conductivity of the measured medium to be higher than 5 μ S/cm. The advantage is significant in humid steam with high humidity, and the full bore structure has almost no pressure loss, but it is not suitable for pure dry steam. It should be noted that the electrode material needs to be adapted to the steam temperature (usually<180 ℃).

2. Our company is a thermal power plant and uses a vortex flowmeter. During operation, we found that there is a discrepancy between the measured value and the amount of makeup water Firstly, it has nothing to do with small flow rate, because small flow rate is zero and the flow rate has not been cut off for a long time. If it is a problem with small flow rate, theoretically the steam quantity will be slightly larger than the actual value, but now the actual measurement on your end is 50% smaller than the water replenishment amount. Secondly, if the range selection is calculated based on the water replenishment amount, the basic problem is not significant. In theory, one ton of water is one ton of steam without loss, unless the loss is particularly large, you can check the loss yourself, that is, steam turns into water and is discharged from the drain valve. Thirdly, whether it is equipped with temperature and pressure compensation, or whether the temperature and pressure compensation is normal. The change in density value is greatly affected by the change in flow rate, and whether the flow coefficient is consistent with the sensor. These settings must be checked. Fourthly, open the valve large and small to observe the changes in the in

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