|
Superheated steam for steam turbines
Combined cycle plant – added electric power
In a combined cycle plant (CCP) the primary engine combustion power cycle is combined with another cycle, steam circuit including a steam turbine (Rankine cycle) to improve the overall electricity output of the plant.
The full heat recovery is typically utilized for generation of superheated steam which expands in a steam turbine producing extra amounts of electricity. The combined cycle application is a good alternative to obtaining the maximum heat load for full heat recovery if no heat sink (process consumer) is within feasible range from the plant and anyhow improved efficiency is pursued.
This application is specially interesting in markets with constant high demands for electricity.
The total plant efficiency is improved by the combined cycle installation by about 7-10%. The own consumption steam circuit is normally implemented in the CCP exhaust gas boiler as well, but additionally also a separate hot water heating section can be provided to further increase the total efficiency by up to 85-90%.
|
