TH32468A - Methods and arrangements for cooling the low-pressure turbine section? - Google Patents

Abstract

Method and arrangement for cooling the low-pressure turbine section. In the method of cooling the low-pressure turbine section of the steam turbine (1), a steam turbine (1) is connected in the water/steam circuit (12). The cooler (K') flows through section (24) of the low-pressure turbine section (2), particularly during idle operation, for effective cooling. At the same time, utilizing the heat obtained in the process, the condensate (K) transferred from the condenser (4) is connected behind the steam turbine (1) and used as the cooler (K'), where the condensate (K) radiates the heat absorbed during cooling to the water/steam circuit (12). At this point, the low-pressure turbine section is connected to the cooler line (22, 22'), which is connected to the outlet of the condenser (4), and in which the heat exchanger (16, 16') located is connected in the water/steam circuit (12).

Claims (10)

1. The cooling method for the low-pressure section of the steam turbine (1) is connected to the water/steam circuit (12) in which the cooler (K') flows through the low-pressure section (2), especially during idle operation, condensate (K) discharged from the condenser (4) connected upstream of the steam turbine (1) is used as the cooler (K') and at least some of the flow t1, t3 of the cooler (K') after flowing through the low-pressure section (2), the first of all is cooled by radiating heat to the water/steam circuit (12) and is subsequently fed back to the water/steam circuit (12). 2. The method in accordance with claim 1 is characterized in the cooler (K') flow through the guiding impeller (24) or each guiding impeller (24) of the low-pressure turbine section (2). 3. A method consistent with claim 1 or 2 is determined. The characteristic of the coolant (K') flowing through the channel is arranged inside the inner box (26) of the low-pressure turbine section (2). 4. A method compliant with one of the claims 1 through 3 is characterized in the cooling element (K'), which is pointed in the separate cooling circuit (52). It is fed back to the condenser (4) after flowing through the low-pressure turbine section (2). 5. A method consistent with one of the claims 1 through 4 is defined in which the refrigerant flow rate (t1) is set in order to control the final temperature (Tk') of the heated refrigerant (K'). 6. Cooling arrangement: The low-pressure section of the steam turbine (1) is connected in the water/steam circuit (12) and has a condenser (4) connected behind it; the low-pressure section of the turbine (2) is connected to the cooling path (22, 22') for the condensate (K'), in which case the cooling path (22, 22') is connected to the outlet side of the condenser (4), and the heat exchanger (16, 16') is connected on the primary side of the cooling path (22, 22') in the direction of the backflow of the low-pressure section of the turbine (2), the secondary side of which the heat exchanger (16, 16') to transfer heat within the condensate (K') is connected in the water/steam circuit (12). 7. The arrangement conforming to claim 6 is characterized in the cooling path (22, 22') which is connected to the condenser's hot well (6) (4). 8. The arrangement conforming to claim 6 or 7 is characterized in the refrigerant path (22) which is connected to the pressure side of the condenser pump (10) which is connected in the water/steam circuit (12). 9. An arrangement consistent with claim 6 or 7 is characterized in the rotary pump (40) connected in the cooling path (22). 10. An arrangement consistent with any of the claims 6 through 9 is characterized by the control of the final temperature (Tk') of the heated chiller (K') during cooling.