When reducing the pressure of water in a high-pressure boiler from 10 MPa to 0.4 MPa using multi-plate orifice plates, what medium should be used for the calculations?
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When reducing the pressure of water in a high-pressure boiler from 10 MPa to 0.4 MPa using multi-plate orifice plates, what medium should be used for the calculations? Is it superheated boiler water or superheated steam? The conditions of the high-pressure boiler water before pressure reduction were 10 MPa and 320℃
The saturation steam temperature at 0.4 MPa is 143.4 degrees. Once you know the temperature of the steam after pressure reduction, you can determine whether it is superheated water or superheated steam. I don’t have any software available, so I can’t help you with the calculations
It should be calculated based on two-phase flow. The liquid phase fraction at 4 bar is 62%. Saturated liquid enthalpy at 10 barG: 1449.7 KJ/KG. Enthalpy of the liquid phase at 4 barG: 639.92 KJ/KG; enthalpy of the vapor phase: 2746.4 KJ/KG. 639.92X + 2746.4(1-X) = 1449.7; X = 0.62
Thank you :) :lol :hug:
Worth learning* – design selection for temperature and pressure reduction