Experience using vortex flowmeters for measuring steam
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Recently, I have been working on a laboratory project that involves the use of flow meters to measure steam flow. It is a vortex flow meter. 1. The medium we are measuring is saturated steam; the temperature of the steam coming out of the boiler is 300 degrees, while it drops to around 150 degrees by the time it reaches the flow meter. Therefore, the vortex flow meter used is equipped with radiators, and when insulating the pipeline, care should be taken not to insulate the flow meter as well, as this could affect its accuracy； 2. We have a flow control valve installed upstream of the vortex flow meter, which is not in compliance with the regulations. According to the rules, the control valve should be installed downstream of the flow meter, and the straight pipe section must meet the requirement of 10 units in front and 5 units behind it ； This has relatively strict installation requirements ； 3. Since vortex flowmeters are used to measure steam, and steam forms vortices, one can look up information in encyclopedias for more details; therefore, installing a control valve upstream has a significant impact on the measurement results ；
“The medium we are measuring is saturated steam; the temperature of the steam coming out of the boiler is 300 degrees, and it drops to around 150 degrees by the time it reaches the instruments. The boiler in the factory mentioned in the post is really impressive – the saturated steam can reach 300°C. What is the pressure in Mpa? 2. Did the poster go to the instrument panel to cool it down specifically?
We use a 4-ton boiler with a pressure of 10–12 kilograms. The distance from the boiler room to the laboratory is about 500 meters. The temperature here is around 160 degrees. As for the value of 300 degrees, I’ve only heard of it; I’m not sure what the actual temperature is in the boiler room. Sorry about that~
4-ton boilers generally produce saturated steam, with the maximum temperature of saturated steam at 1.2 Mpa being around 190°C. Superheated steam can only reach a temperature of 300°C, but even superheated steam at 300°C cannot drop to 150°C after passing through 500m of pipe, unless pressure and temperature reduction measures are taken.
I’ve learned it!* :victory: I just looked up the difference between saturated steam and superheated steam; the type we use is saturated steam, as there is a corresponding relationship between its temperature and pressure!
The steam that comes directly from the boiler is superheated steam; it becomes saturated steam only after passing through a temperature and pressure reduction device
Ha, we just focus on using steam – as long as it meets our requirements, that’s fine. As for what’s going on in the boiler room, I really don’t know much about it~ I’ve learned nothing~
:)Don’t make things difficult for the original poster; the group leader has already told you not to install the valves in front of the instruments. As for temperature, as long as the original poster can use it, that’s fine:lol
Our factory has a 20-ton boiler that produces 10 kilograms of steam at a temperature of around 190 degrees, with a maximum of 220 degrees; it’s impossible for the temperature to reach 300 degrees. A distance as short as from 300 to 150 requires a temperature and pressure reduction device unless otherwise.
Haha, it seems the figures I heard secondhand are still too inaccurate – I’ve been dismissed! Everyone, pay attention to the key points! The focus is on the flow meter, not the boiler: lol let’s learn from each other*, let’s learn together*~
It was discussed in previous posts； What comes out of the boiler is a mixture of water and steam; after vapor-liquid separation, saturated steam emerges from the drum ； Saturated steam is reheated in a superheater to become superheated steam.