packageExercise7MixingPreheater
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Information
This package extend the steam power plant in Exercise6SteamPowerPlant by a mixing preheater. The examples differ by:
-
The solution method: implicit nonlinear equations (
Inversion) vs.pseudoInversion"controllers".
English problem description
A small increase in the efficiency of a stationary steam power plant (compared to example 6) is achieved by installing a
mixing preheater. Saturated liquid water at state 1 (50.0 mbar, 32.90 °C)
is pumped by the reversible adiabatic feedwater lowPressurePump to 10.0 bar.
In the isobaric, externally adiabatic mixingPreheater, a portion of the mass flow (state 7)
from the process steam extracted from the turbine is mixed with the water
from state 2. This results in a feedwater temperature of T3 = 130 degC. The reversible adiabatic
feedwater highPressurePump then raises the water pressure to 20.0 bar.
In the isobaric heater, the water is heated, vaporized and superheated (288 MW) to 540 degC.
In the steam turbine (isentropic efficiency eta_is = 0.889), after the first turbine stage
(highPressureTurbineStage, 10.0 bar), a portion of the steam (state 7) is extracted and fed to the
mixingPreheater. The remaining steam in the turbine is further expanded
(lowPressureTurbineStage, 50.0 mbar), condensed in the isobaric condenser and returned to the lowPressurePump, closing the cycle.
Contents
| Name | Description |
|---|---|
 Inversion | |
| PseudoInversion |