Combined-cycle steam turbo alternator circuit
This steam circuit turbo alternator diagram explains the steam side of a combined-cycle power plant. Natural gas powers a gas turbine generator, whose hot exhaust feeds a triple-pressure heat recovery steam generator. The HRSG produces main steam at 100 bar and 565 C for an HP-IP-LP steam turbine connected to its own alternator and grid transformer.
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Scenario
A combined-cycle station captures gas-turbine exhaust heat in an HRSG to run a second, steam-driven alternator. The diagram separates the gas-turbine and steam-turbine electrical outputs while preserving the heat-recovery link.
Key decisions
- Heat recovery: Gas-turbine exhaust raises steam in a triple-pressure HRSG.
- Steam expansion: HP, IP, and LP stages extract work before condensation.
- Separate generators: Both turbine trains connect to the grid through their own transformers.
- Feedwater return: Recovered condensate re-enters the HRSG through the economizer.
When to reuse this
Use this for a high-level combined-cycle plant overview where the heat-recovery steam cycle and both electrical trains need to be clear. It is suitable for training or plant documentation.
Frequently asked questions
What is an HRSG?
Why are there two alternators?
What does triple-pressure mean?
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