Selection of boiler feedwater flow meter
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What type of flow meter should be used to measure the flow rate of boiler feed water, for use in three-element control? In one of my design drawings, a metal tube rotameter was selected – is that acceptable? Orifice plate flowmeters are generally the choice! Although the rotor can also be equipped with remote transmission, it always seems a bit inappropriate; everyone please share their opinions! The design firm that helped us with the design is really great; the other time there was a question I wasn’t sure about, so I asked him about it, and he said, \"Do you understand it or not?\"
I’m not sure about boiler water level control, but the rotameter definitely won’t be a problem; with a boiler of that size, an error of around 1% isn’t a big deal... Orifice plates or electromagnetic sensors work fine as well – after all, it’s just for control purposes, and high precision isn’t necessary... :)
The boiler feedwater requirements I’ve encountered don’t require very high precision; I’ve seen vortex flow meters as well as orifice plates. I think the rotor is sufficient, but no matter what type of flow meter is used, there’s no need to get too caught up in comparing the amounts of water and steam.
Regarding this issue, it mainly depends on his perspective: 1. If it is simply a matter of measuring the flow rate of water supplied to the boiler, then a rotameter is perfectly suitable, as it is a proven technology and the operating conditions are not complex. From this perspective, the choice of flow meter type mainly depends on usage habits and financial capabilities. 2. If the feedwater flow meter of this boiler is to be used in the three-element control loop, in material balance calculations, and for cost accounting purposes, my recommendation is not to use a rotameter. After all, if a rotameter is to undertake so many functions, it is not suitable for such roles in terms of accuracy, stability, and lifespan. 3. Regardless of their size, design firms all have their own design habits as well as certain \"unwritten rules.\" As the client, it is necessary to actively communicate with the design firm and clearly express one’s own views and bottom lines. I hope this can be of some help to the original poster.
Orifice plate flowmeters are mature in technology and exhibit good stability; for use in control systems, it is recommended to opt for orifice plate flowmeters....
For boiler feed water, the pressure is at least 16 MPa; therefore, design firms usually use orifice plates. It would be best if you got in touch with the design firm regarding this: lol