Method of operating a power station plant

• US 6,223,523 B1
• Filed: 07/17/1998
• Issued: 05/01/2001
• Est. Priority Date: 07/25/1997
• Status: Expired due to Fees

• Current Assignee: Alstom SA
• Original Assignee: Asea Brown Boveri AG (ABB Limited)
• Inventors: Frutschi, Hans Ulrich
• Primary Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US09/116,933
• Time in Patent Office: 1,019 Days
• Field of Search: 60/39.05, 60/39.182, 60/39.53, 60/39.55, 60/728
• US Class Current: 60/775
• CPC Class Codes: F01K 21/042 pure steam being expanded in a motor somewhere in the plant F01K21/045 takes precedence
• CPC Class Codes: F01K 21/047 having at least one combustion gas turbine
• CPC Class Codes: F01K 23/10 with exhaust fluid of one cycle heating the fluid in another cycle F01K17/025 takes precedence
• CPC Class Codes: Y02E 20/18 Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

Abstract

In a method of operating a power station plant which essentially comprises a gas-turbine group and a steam circuit arranged downstream, a portion of the condensate collecting from this steam circuit is directed to an intercooler, which belongs to the compressor of the gas-turbine group and in which the condensate is heated up to form hot water. This hot water is then introduced directly or via a further heating-up means into the gas-turbine group at a suitable point.

Claims

1. A method of operating a power station plant including a gas-turbine group, a waste-heat steam generator connected downstream of the gas-turbine group, and a steam circuit connected downstream of the waste-heat steam generator, the gas-turbine group comprising at least one compressor unit having at least one intercooler, at least one combustion chamber, at least one turbine, and at least one generator or a load, the exhaust gases from the last turbine flowing through the waste-heat steam generator, in which the generation of at least one portion of steam is effected for the operation of at least one steam turbine belonging to the steam circuit, comprising:

turning a portion of condensate collected from the last steam turbine into a medium in the intercooler;

introducing the medium into the gas-turbine group; and

directing make-up water into the condensate upstream of the intercooler.

2. The method claimed in claim 1, wherein the medium is introduced into the gas-turbine group directly.

3. The method claimed in claim 1, wherein the medium is introduced into the gas-turbine group via a further heating-up means.

4. The method as claimed in claim 1, wherein the medium is hot water.

5. The method as claimed in claim 1, wherein the medium is composed of a hot-water/steam mixture.

6. The method as claimed in claim 1, wherein the medium is introduced upstream of a combustion chamber and/or into said combustion chamber.

7. The method as claimed in claim 1, wherein the medium is enriched with a fuel quantity.

8. The method as claimed in claim 1, wherein the further heating-up of the medium is carried out in an economizer section belonging to the waste-heat steam generator before it is directed into the gas-turbine group.