I suggest we discuss the design experience of high-pressure heaters.
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I recently took over a high-pressure heater and am not sure where to start. First, I need to calculate the heat exchange area, but I’m confused about this; the area I calculate comes out to be much smaller than the value provided by the manufacturer. The main issue lies in determining the heat transfer coefficients for the three different heating stages. I would like to ask the experts here: when calculating a high-pressure heater, are the heat transfer coefficients based on empirical data or are they calculated? Also, when is it necessary to include superheating stages and drain cooling stages?
For an approximate calculation of the heat transfer coefficient, empirical data can be used; however, careful consideration is required during design, taking into account factors such as the structure, parameters of the heating steam, and parameters of the feed water； For superheated steam with a pressure usually greater than 1.0 MPa, it is necessary to arrange a superheating section; a drain section should be provided when the drain temperature is below the corresponding saturated temperature. For details, please refer to the Technical Manual for Thermal Power Plants, Volume 4: \"Turbine Systems and Auxiliary Equipment\".