combined cycle power station
Let an agent explain how a combined cycle power station works and why it is efficient, relay typical performance, emissions and regulation from engineering and regulatory sources, and separate it from simple cycle gas turbines, steam plants and cogeneration.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain how a combined cycle power station works and why it is efficient, relay typical performance, emissions and regulation from engineering and regulatory sources, and separate it from simple cycle gas turbines, steam plants and cogeneration.
A power station in which gas turbines burn fuel, usually natural gas, to generate electricity and their hot exhaust raises steam in heat recovery boilers to drive steam turbines that generate more electricity; combining the two cycles reaches efficiencies of about 60 percent, the highest of fossil-fuelled plants, and such stations provide much of the flexible generation in many grids.
What it is for: Generating electricity efficiently from gas.
It can be explain the combined cycle principle; relay typical efficiency, capacity and emissions; explain the role in grids; distinguish from related plant types.
Distinguishing features
Two thermodynamic cycles in series
Highest fossil plant efficiency
Flexible operation
Gas fuelled in most cases
What it looks like
A plant with gas turbine halls, heat recovery steam generators, a steam turbine, cooling systems and exhaust stacks.
Physical character
efficiency: about 55-63 percent - lower heating value basis
capacity: about 50-1500 MW - by plant
carbon dioxide emissions: about 350-400 g per kWh - natural gas fuel
How it is recognised
Gas turbines feeding heat recovery boilers and a steam turbine
Efficiency around 60 percent
Open cycle gas turbines lack the steam stage; cogeneration exports heat
Related models
is a kind of - with a steam stage added
is a kind of - in its second cycle
uses - the linking component
is contrasted with - without heat recovery
In practice
Families and kinds
single-shaft and multi-shaft configurations
combined heat and power variants
integrated gasification combined cycle
hydrogen-ready plants
plants with carbon capture, in development
Standards and regulation
Grid codes and generation licensing
Emissions limits for large combustion plants
Industrial emissions and best available techniques references
Safety standards for gas and steam plant
Failure modes and hazards
Gas supply and price exposure
Emissions and climate impact
Turbine and boiler failures
Water use for cooling
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Principle How it works.
Engineering.
Cycles
The two cycles.
Cycles
Cycles.
- How do the gas turbine and steam cycles combine, and why does that raise efficiency? definition
- Is the plant combined cycle, open cycle, steam or cogeneration? boundary
Components
Components.
Components
Components.
- What are the main components, and how are they configured? definition
- Which entry fits gas turbines? action
Perform Performance and emissions.
Numbers.
Efficiency
Efficiency and capacity.
Efficiency
Efficiency.
- What efficiency and capacity do plants achieve, and how are they measured? measurement
- Which sources give the figures? provenance
Emissions
Emissions.
Emissions
Emissions.
- What emissions do plants produce, and what limits apply? measurement
- Which entry fits emissions regulation? action
Operate Grid role and operation.
Operation.
Grid
Role in the grid.
Grid
Grid.
- What role do combined cycle plants play in balancing grids with renewables? provenance
- Which entry fits electricity grids? action
Safety
Safety and maintenance.
Safety
Safety.
- What safety and maintenance regimes apply? provenance
- Is the question about a specific plant, which needs its operator? boundary
Context Future and history.
Context.
Future
Hydrogen and capture.
Future
Future.
- How are hydrogen fuel and carbon capture being developed for these plants, with claims attributed? provenance
- Is the presentation neutral? boundary
History
History.
History
History.
- How did combined cycle technology develop? provenance
- Which references are standard? provenance
What the second pass must settle
- Should heat recovery steam generators be a separate entry?
- How should emissions data be linked?
- How should hydrogen and carbon capture developments be recorded with attribution?