Regarding boiler flow resistance
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Dear experts, when calculating the pressure for a boiler, there is an item related to the flow resistance of the boiler. How can this resistance be determined? Thank you all. It might be simple, but I still can’t do it. . . Thank you, it’s my first post
Fire pipes or water pipes? Tube side shell side? That’s too general; it’s recommended to read the relevant sections in the boiler calculation manual before asking questions, so that they can be asked in a targeted manner. It’s really hard to answer like this.
Oh oh oh, a water-tube boiler? Sorry, I’m a beginner. . . :'(
JBZ201. It’s easy to calculate for single-phase media, but difficult for water circulation. It depends specifically on the structure of the boiler.
If only the calculation of pressure is required, there are simple methods for estimation (which is what we use), but the error may be large: for a water-cooled system, it is the working pressure of the drum plus the hydrostatic pressure of the water wall fluid column (calculated at 1000 kg/m3)； For the superheating system, the resistance is taken as the difference between the working pressure of the drum and the steam pressure at the boiler outlet, with this value being distributed among the various components ； The economizer system is set at around 0.4 MPa. For a safer approach, a higher pressure can be used as the calculation pressure.
I’ve also read a bit of this book, but I still don’t quite understand it； I’ll keep researching further. Thank you
Starting from the steam collection box and working backwards, it is sufficient to refer to the Excel-based calculations of the steam-water resistance for several typical components in the textbook in order to determine the operating pressure of each component in the boiler.