HRSG & Steam Turbine
HEAT RECOVERY STEAM GENERATORS AND STEAM TURBINE
The combustion gasses exhausted from the gas turbines at 600°C is further passed through heat exchangers inside the two heat recovery steam boilers to produce steam at 3 different pressure levels. The steam temperature in high-pressure level reaches 567°C. The live steam at 3 different pressure levels (120-26-5 bars) from the two boilers are led to high-intermediate- and low-pressure steam turbines that are connected to each other via a common shaft. The live steam rotates the steam turbine while passing through the narrow opening between the casing and the blades. This rotational mechanical energy is converted to electrical energy on the steam turbine generator connected on the same shaft. The dead steam leaving the low-pressure steam turbine is condensed in a water cooled condenser and then fed back to boilers in water form to continue the cycle.
Cooling water circulating in the condenser is cooled in 16 each, low-profile, forced-draft, wet cooling towers.