About this lesson
Large coal plants combine both ideas: steam is reheated between turbine sections and bled from several points to heat the feed water. This is the layout of most big thermal units.
How it works
- Superheated steam expands in the HP turbine.
- Part of the steam is bled to the high-pressure feed-water heaters.
- The rest returns to the boiler for reheat, then expands in the IP and LP turbines with more bleeds.
- Exhaust steam condenses, and the feed water is heated step by step before the boiler.