EP2878907A1 - Condenseur intégré - Google Patents

Condenseur intégré Download PDF

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Publication number
EP2878907A1
EP2878907A1 EP13194842.4A EP13194842A EP2878907A1 EP 2878907 A1 EP2878907 A1 EP 2878907A1 EP 13194842 A EP13194842 A EP 13194842A EP 2878907 A1 EP2878907 A1 EP 2878907A1
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EP
European Patent Office
Prior art keywords
cooling water
cooling
chamber
steam
condenser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13194842.4A
Other languages
German (de)
English (en)
Inventor
Hans-Ulrich LENHERR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Priority to EP13194842.4A priority Critical patent/EP2878907A1/fr
Publication of EP2878907A1 publication Critical patent/EP2878907A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B7/00—Combinations of two or more condensers, e.g. provision of reserve condenser

Definitions

  • the present invention relates to a condenser for water/steam cycle, in particular to an integrated condenser for water/steam cycle of a thermal power plant.
  • a water/steam cycle of a thermal power plant in general comprises, as shown in the schematic diagram of Fig. 1 , a steam generator 10, a steam turbine 20, a condenser 30 and a feedwater pump 40.
  • the steam generator 10 which may be a heat recovery steam generator (HRSG) of a combined cycle power plant (CCPP), generates steam by heating up feedwater, which is pumped to the steam generator 10 by means of the feedwater pump 40.
  • the generated steam is used to drive the steam turbine 20, which may have high-pressure, intermediate pressure and low pressure stages.
  • the steam, which leaves the steam turbine 20, is converted back into feedwater by means of the water cooled condenser 30 with its internal cooling water circuit.
  • the configuration of a typical water cooled condenser 30 is well known in the prior art (see document US5018572A and WO2013117730 ).
  • the condenser 30 comprises a plurality of tube bundles, through which the cooling water flows.
  • the steam from the steam turbine 20 enters the condenser 30 and comes into close thermal contact with the tube bundles.
  • the heat exchange was conducted between the steam and the cooling water in the tube bundles.
  • the condensed steam is then collected in a hot well in the condenser, and then led to the feedwater pump 40.
  • the cooling water through the condenser 30 comes from the main cooling water stream 60.
  • a branch of the main cooling water stream 60 enters the condenser 30 for cooling the steam.
  • another branch of the main cooling water stream 60 enters an intercooler 50 to conduct heat exchange with another cooling circuit 70.
  • the cooling circuit 70 uses the closed cooling water (CCW) therein to cool another unit such as the gas turbine generator, gas turbine lube oil system, and the like.
  • the closed cooling water is demineralized water treated with chemicals so as to prevent corrosion. Therefore, the units are not directly cooled by the main cooling water but by the closed cooling water. Then the cooling circuit 70 taking the heat from the units is cooled by the main cooling water in the intercooler 50.
  • Fig. 1 schematically shows the conventional arrangement of the cooling system in a thermal power plant.
  • the water cooled condenser 30 and the closed cooling water intercooler 50 are two separate components while they share the same main cooling water stream 60 as the cooling media source.
  • such arrangement of the cooling system raises an issue. That is, due to the separate arrangement of the condenser 30 and the intercooler 50, cleaning system and piping need to be disposed duplicately for the condenser and the intercooler, and separate foundations for the condenser and the intercooler are required. This takes up a lot of space. In the meantime, the duplicated arrangement also causes higher cost.
  • a condenser for water/steam cycle comprising a cooling water inlet, a cooling water outlet and a cooling unit disposed between the inlet and outlet, wherein the cooling unit comprises a first cooling chamber to receive and cool steam from the water/steam cycle and a second cooling chamber to receive and cool another cooling circuit.
  • the cooling water inlet receives main cooling water and delivers it respectively to the first cooling chamber and the second cooling chamber
  • the cooling water outlet receives the returned main cooling water and delivers it out of the condenser
  • the first cooling chamber comprises a plurality of first pipes to convey cooling water from the cooling water inlet to the cooling water outlet and conduct heat exchange with the steam
  • the second cooling chamber comprises a plurality of second pipes to convey cooling water from the cooling water inlet to the cooling water outlet and conduct heat exchange with said another cooling circuit.
  • the integrated condenser of the present invention With the integrated condenser of the present invention, no separate intercooler is needed and one common cooling water supply and return line can be applied. Thus the whole piping length can be reduced. Further, as no separate foundation and mounting are required, it is able to reduce the space and on-site installation process and thus reduce the overall cost. Besides, as the intercooler is integrated into the condenser as the second cooling chamber, the whole equipment shall be delivered and maintained by one supplier, which also reduce the cost and outage time for service.
  • the returned main cooling water comprises a first cooling water return line on the downstream of the first cooling chamber and a second cooling water return line on the downstream of the second cooling chamber, wherein a control valve is disposed in the first cooling water return line or the second cooling water return line.
  • the control valves can also be disposed in both the first cooling water return line and the second cooling water return line.
  • the main cooling water is split into a first cooling water supply line on the upstream of the first cooling chamber and a second cooling water supply line on the upstream of the second cooling chamber, wherein a control valve is disposed in the first cooling water supply line or the second cooling water supply line.
  • the another cooling circuit mentioned above is used to cool another unit in a thermal power plant such as the gas turbine generator or steam turbine generator, gas turbine or steam turbine lube oil system, feedwater pump and the like.
  • control valve disposed in the cooling water supply line or return line, it is able to keep the cooling circuit in an expected temperature level, so as to assure a correct cooling on said another unit to be cooled by the cooling circuit.
  • Fig. 2 shows a schematic view of the condenser according to the first embodiment of the invention.
  • this condenser 30 is arranged in a water/steam cycle of a thermal power plant in general.
  • the condenser 30 comprises a cooling water inlet 31, a cooling water outlet 33 and a cooling unit 32 disposed between the cooling water inlet and outlet.
  • the cooling water inlet and outlet can be a waterbox as known in the prior art.
  • the cooling unit 32 comprises a first cooling chamber 34 and a second cooling chamber 35 separated by a partition wall 36.
  • the cooling water inlet 31 receives the main cooling water 60 as the cooling media source from outside and delivers it into the first cooling chamber 34 and second cooling chamber 35.
  • the first cooling chamber 34 includes a plurality of first pipes 37 to convey a portion of the main cooling water from the cooling water inlet 31.
  • the first pipes 37 are in form of a plurality of tube bundles arranged in parallel. As shown in Fig. 2 , the steam 80 from the water/steam cycle is fed into the first cooling chamber 34 and comes into close thermal contact with the cooling water flowing through the first pipes 37.
  • the cooling water in the first pipes 37 after taking the heat from the steam flows to the cooling water outlet 33.
  • the second cooling chamber 35 includes a plurality of second pipes 38.
  • the second pipes 38 can also be in form of a plurality of tube bundles, which conveys another portion of the main cooling water 60 from the cooling water inlet 31.
  • the second cooling chamber 35 receives the water to be cooled from another cooling circuit 70.
  • the cooling circuit 70 is used to cool another unit in a thermal power plant, such as the gas turbine generator or steam turbine generator, gas turbine or steam turbine lube oil system, feedwater pump and the like.
  • the cooling circuit 70 normally contains demineralized water treated with chemicals so as to prevent corrosion. It takes the heat from another unit and then is fed into the second cooling chamber 35.
  • the heat exchange is conducted in the second cooling chamber 35 between the demineralized water from the cooling circuit 70 and the cooling water flowing through the second pipes 38.
  • the flow direction of the cooling circuit 70 is preferably opposite to the cooling water flow direction in the second pipes 38 so as to perform a better heat exchange effect.
  • the cooling water in the second pipes 38 upon taking the heat then flows to the cooling water outlet 33.
  • the second cooling chamber 35 performs as the intercooler, which is integrated into the condenser 30.
  • Fig. 3 shows a schematic view of the condenser according to the second embodiment of the invention.
  • the main configuration is similar to that in Fig. 2 .
  • the main cooling water after flowing through the first cooling chamber 34 and the second cooling chamber 35 returns to the cooling water outlet 33.
  • This returned main cooling water comprises a first cooling water return line 43 on the downstream of the first cooling chamber 34 and a second cooling water return line 44 on the downstream of the second cooling chamber 35.
  • the cooling water outlet 33 is divided into two compartments, which respectively receive the first cooling water return line 43 and the second cooling water return line 44.
  • a control valve 46 is disposed in the second cooling water return line 44. After the control valve 46, the first cooling water return line 43 and second cooling water return line 44 are joined to one stream of the returned main cooling water 61.
  • the cooling circuit 70 is used to cool another unit in a thermal power plant, such as the gas turbine generator or steam turbine generator, gas turbine or steam turbine lube oil system.
  • a thermal power plant such as the gas turbine generator or steam turbine generator, gas turbine or steam turbine lube oil system.
  • Such unit requires a more precise control on the target cooling temperature. Therefore, the cooling water temperature in the cooling circuit 70 has to be precisely controlled to assure a correct cooling on said unit.
  • the control valve 46 is arranged to control the flow rate of the main cooling water through the second cooling chamber 35, and thus to control the heat exchange between the cooling water in the second pipes 38 and the cooling water in the cooling circuit 70. As a result, the temperature of the cooling water in the cooling circuit 70 can be kept on an expected temperature level.
  • control valve 46 is disposed in the first cooling water return line 43 to control the distribution of the flow rate from the main cooling water 60.
  • the control valve 46 can reduce the cooling water flow rate through the first cooling chamber 34 and as a result increase the flow rate to the second cooing chamber 35.
  • two control valves in both the first and second cooling water return line. This may provide better flexibility and operability on the temperature control of the cooling circuit 70.
  • Fig. 4 shows a schematic view of the condenser according to the third embodiment of the invention.
  • the main cooling water 60 is split into a first cooling water supply line 41 on the upstream of the first cooling chamber 34 and a second cooling water supply line 42 on the upstream of the second cooling chamber 35.
  • a control valve 45 is disposed in the second cooling water supply line 42.
  • the cooling water inlet 31 is divided into two compartments, which respectively receive the main cooling water from the first cooling water supply line and the second cooling water supply line, and deliver it into the first cooling chamber 34 and the second cooling chamber 35 separately.
  • the control valve 45 is used to control the flow rate of the cooling water flowing through the second pipes 38, so as to indirectly control the cooling temperature of the cooling circuit 70.
  • the control valve 45 is disposed in the first cooling water supply line 41.
  • control valve is disposed either on the upstream or the downstream of the second cooling chamber, it can be also arranged on both the upstream and downstream of the first and/or second cooling chamber depending on the actual requirement.
  • a control valve is arranged on the downstream of the cooling chamber, and a shutoff valve is arranged on the upstream of the cooling chamber.
EP13194842.4A 2013-11-28 2013-11-28 Condenseur intégré Withdrawn EP2878907A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13194842.4A EP2878907A1 (fr) 2013-11-28 2013-11-28 Condenseur intégré

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13194842.4A EP2878907A1 (fr) 2013-11-28 2013-11-28 Condenseur intégré

Publications (1)

Publication Number Publication Date
EP2878907A1 true EP2878907A1 (fr) 2015-06-03

Family

ID=49680854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13194842.4A Withdrawn EP2878907A1 (fr) 2013-11-28 2013-11-28 Condenseur intégré

Country Status (1)

Country Link
EP (1) EP2878907A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5018572A (en) 1989-02-23 1991-05-28 Asea Brown Boveri Ltd. Steam condenser
EP1174672A2 (fr) * 2000-07-04 2002-01-23 Alstom (Switzerland) Ltd Centrale combinée ou à vapeur
US20100229553A1 (en) * 2009-03-12 2010-09-16 General Electric Company Condenser for power plant
WO2013117730A2 (fr) 2012-02-10 2013-08-15 Alstom Technology Ltd Cycle eau/vapeur et son procédé d'actionnement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5018572A (en) 1989-02-23 1991-05-28 Asea Brown Boveri Ltd. Steam condenser
EP1174672A2 (fr) * 2000-07-04 2002-01-23 Alstom (Switzerland) Ltd Centrale combinée ou à vapeur
US20100229553A1 (en) * 2009-03-12 2010-09-16 General Electric Company Condenser for power plant
WO2013117730A2 (fr) 2012-02-10 2013-08-15 Alstom Technology Ltd Cycle eau/vapeur et son procédé d'actionnement

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