Ultra-Supercritical Power Plant
The DISPATCHES Ultra-Supercritical Power Plant Model is an example flowsheet for a pulverized coal-fired ultra-supercritical power plant. This model simulates a plant producing ~436 MW of gross power.
Abbreviations
Acronym |
Name |
|---|---|
\(RH\) |
Reheater (\(RH1\) and \(RH2\)) |
\(BFPT\) |
Boiler Feed Water Pump Turbine |
\(FWH\) |
Feed Water Heaters (\(FWH1\) to \(FWH9\)) |
\(BFW\) |
Boiler Feed Water |
\(USC\) |
Ultra-Supercritical |
\(F_{cond}\) |
Condenser Flow Out (mol/s) |
\(F_{boiler}\) |
Boiler Flow In (mol/s) |
Model Structure
The ultra-supercritical Power Plant Model consists the following models from the idaes/power_generation unit model library in addition to the IAPWS property package for steam and water.
Unit Model |
Units in the flowsheet |
|---|---|
\(HelmTurbineStage\) |
Turbines (\(T1\) to \(T11\)) and \(BFPT\) |
\(HelmSplitter\) |
Turbine Splitters |
\(Heater\) |
Boiler components, i.e., \(Boiler\), \(RH1\), and \(RH2\) |
\(HelmMixer\) |
Mixers (including \(Condensate Mixer\) and \(Deaerator\)) |
\(HelmIsentropicCompresssor\) |
Pumps, i.e., \(Condenser Pump\), \(Booster Pump\), and \(BFW Pump\) |
\(HeatExchanger\) |
Condenser and Feedwater Heaters, \(FWH1\) to \(FWH9\) |
Degrees of Freedom
The ultra-supercritical Power Plant Model has 2 degrees of freedom, i.e., feedwater flow (\(boiler.inlet.flow_-mol\)) and feedwater pressure (\(boiler.outlet.pressure\))
Notable Variables
Variable Name |
Description |
|---|---|
\(PlantPowerOut\) |
Net power out from the plant in MW |
\(PlantHeatDuty\) |
Total boiler heat duty (i.e., \(Boiler\), \(RH1\), and \(RH2\)) in MWth |
Notable Constraints
Boiler temperature out is set to be 866 K, i.e.
where, \(Unit\) is in \([Boiler, RH1, RH2]\)
\(PlantPowerOut\) is given by the total turbine mechanical work, i.e.,
where, \(Unit\) is in \([T1 : T11]\)
\(PlantHeatDuty\) is given as the sum of heat duties for Boiler units,
where, \(Unit\) is in \([Boiler, RH1, RH2]\)
This is a simple model for an ultra-supercritical pulverized coal power plant based on a flowsheet presented in Ref [1]: 1999 USDOE Report #DOE/FE-0400. This model uses some of the simpler unit models from the power generation unit model library and some of the parameters in the model, such as feed water heater areas, overall heat transfer coefficients, and turbine efficiencies at multiple stages have all been estimated for a total power out of 437 MW. Additional assumptions are as follows: (1) The flowsheet and main steam conditions, i. e. pressure & temperature are adopted from the aforementioned DOE report (2) Heater unit models are used to model main steam boiler, reheater, and condenser. (3) Multi-stage turbines are modeled as multiple lumped single stage turbines
updated (10/07/2021)