4.2.6 Condensate System
4.2.6.1 Description of the Condensate System
The object of the condensate system is to condense the steam, and circulate the water back to the HRSG.
From the last stage of the steam turbine the steam is led to a condenser where it is condensed to water. From the condenser the condensate is pumped to the HRSG, passing the gland steam condenser.
Make-up water is added to compensate for any water losses. Condensate then flows through the condensate preheater (normal situation). Part of the water from the preheater outlet is recirculated to the condensate preheater inlet. By this way the minimum inlet temperature of the preheater is controlled above the water dew point of the flue gas. From the preheater, the condensate is lead to the deaerator.
4.2.6.2 Condensate Pumps
A total of two condensate pumps are installed. The pumps extract water from the condenser hot well and pressurize it. The pumps are equipped with a minimum flow line. During normal operation one pump will be in operation and the other will be standby. However when both IP bypass stations are in operation, both condensate pumps shall be in operation.
4.2.6.3 Condensate Preheater
The objective of the condensate preheater system is to heat condensate by means of heat from the gas turbine exhaust gas flow in the HRSG. Condensate from the condenser is supplied to per-heater.
Part of the water from the preheated outlet is recirculated to the condensate preheated inlet to maintain a minimum preheated inlet temperature. When the GT is running on solar oil, the preheater will be completely bypassed using the three way valve.
4.2.6.1 Description of the Condensate System
The object of the condensate system is to condense the steam, and circulate the water back to the HRSG.
From the last stage of the steam turbine the steam is led to a condenser where it is condensed to water. From the condenser the condensate is pumped to the HRSG, passing the gland steam condenser.
Make-up water is added to compensate for any water losses. Condensate then flows through the condensate preheater (normal situation). Part of the water from the preheater outlet is recirculated to the condensate preheater inlet. By this way the minimum inlet temperature of the preheater is controlled above the water dew point of the flue gas. From the preheater, the condensate is lead to the deaerator.
4.2.6.2 Condensate Pumps
A total of two condensate pumps are installed. The pumps extract water from the condenser hot well and pressurize it. The pumps are equipped with a minimum flow line. During normal operation one pump will be in operation and the other will be standby. However when both IP bypass stations are in operation, both condensate pumps shall be in operation.
4.2.6.3 Condensate Preheater
The objective of the condensate preheater system is to heat condensate by means of heat from the gas turbine exhaust gas flow in the HRSG. Condensate from the condenser is supplied to per-heater.
Part of the water from the preheated outlet is recirculated to the condensate preheated inlet to maintain a minimum preheated inlet temperature. When the GT is running on solar oil, the preheater will be completely bypassed using the three way valve.
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