Combined cycle power plant

Patent metadata

Field	Value
Publication number	US-10590807-B2
Application number	US-201615176680-A
Country	US
Kind code	B2
Filing date	Jun 8, 2016
Priority date	Dec 19, 2013
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

The invention relates a combined cycle power plant with a gas turbine, a shaft connecting a compressor to a turbine, and a first generator, a heat recovery steam generator fluidly connected to the exhaust of the gas turbine.

First claim

What is claimed is:

1. A combined cycle power plant comprising a gas turbine coupled to a first generator, a heat recovery steam generator (HRSG) fluidly connected to an exhaust of the gas turbine, and a steam turbine arrangement comprising a high pressure steam turbine and/or a medium pressure steam turbine and/or a low pressure steam turbine connected to the heat recovery steam generator with at least one of: a high pressure life steam pipe, a medium pressure hot reheat steam pipe and a low pressure steam pipe, and a steam turbine shaft connecting the steam turbine arrangement and a second generator, the combined cycle further comprising:
at least one HRSG supporting structure; and
at least one bundle comprising:
a bundle suspension comprising at least one spring, the bundle suspension coupled to the at least one HRSG supporting structure:
an upper manifold coupled to the bundle suspension:
a plurality of vertically arranged heat exchanger pipes coupled to the upper manifold: and
a lower manifold coupled to the plurality of vertically arranged heat exchanger pipes,
wherein the bundle suspension is spring loaded via the at least one spring and pulls the upper manifold vertically upward, and
wherein the high pressure steam turbine and/or the medium pressure steam turbine is arranged next to the heat recovery steam generator with the high pressure life steam pipe connecting a final lower superheat manifold to the high pressure steam turbine, and/or the medium pressure hot reheat steam pipe connecting a final lower reheat manifold to the medium pressure steam turbine.

2. A combined cycle power plant according to claim 1 , wherein the high pressure life steam pipe, and/or the medium pressure hot reheat steam pipe is free of dilatation loops, and
wherein the high pressure steam turbine is arranged such that both a steam turbine front face and a steam turbine inlet are adjacent to the HRSG.

3. A combined cycle power plant according to claim 1 , wherein the heat recovery steam generator has a horizontal flow path, wherein the at least one bundle is movable in a vertical direction to at least partly compensate for thermal expansion of the at least one bundle.

4. A combined cycle power plant according to claim 1 , wherein the final lower superheat manifold for high pressure and the high pressure life steam pipe and/or that the final lower reheat manifold for medium pressure and the medium pressure hot reheat steam pipe are arranged in a straight line.

5. A combined cycle power plant according to claim 1 , wherein the high pressure life steam pipe and/or that the medium pressure reheat steam pipe consists of a horizontal section and an elbow or consists of a horizontal section, an elbow and vertical section, and
wherein a flow direction of the medium pressure steam turbine is reversed and orientated in a counterflow arrangement to that of a flue gas flow in the heat recovery steam generator.

6. A combined cycle power plant according to claim 1 , wherein the high pressure life steam pipe has a single piping fix point at a first connection of the high pressure life steam pipe to the high pressure steam turbine, and/or the medium pressure hot reheat steam pipe has a single piping fix point at a second connection of the medium pressure hot reheat steam pipe to the medium pressure steam turbine, and
wherein each of the single piping fix point comprises mechanical fixations in three dimensions.

7. A combined cycle power plant according to claim 1 , wherein a first connection of the high pressure life steam pipe to the final lower superheat manifold is free of fix points, and/or a second connection of the medium pressure hot reheat steam pipe to the final lower reheat manifold is free of fix points.

8. A combined cycle power plant according to claim 1 , wherein the bundle suspension for a top suspended bundle for high pressure steam has a fix point in a direction of an axial extension of the high pressure life steam pipe and/or in that the bundle suspension for a top suspended bundle for medium pressure hot reheat has a fix point in a direction of the axial extension of the medium pressure hot reheat steam pipe, and
wherein each of the fix point comprises mechanical fixations within a single plane.

9. A combined cycle power plant according to claim 1 , wherein the high pressure life steam pipe is connected to the high pressure steam turbine from below and/or the medium pressure hot reheat steam pipe is connected to the medium pressure steam turbine from below, and
wherein the lower manifold and the upper manifold are connected via one or more link pipes.

10. A combined cycle power plant according to claim 1 , wherein the high pressure life steam pipe is connected to the high pressure steam turbine with a pipe elbow and/or the medium pressure hot reheat steam pipe is connected to the medium pressure steam turbine with a pipe elbow, and in that a ratio of a mean radius (r) of each of the pipe elbow to a corresponding pipe diameter is greater than 2.

11. A combined cycle power plant according to claim 1 , wherein the heat recovery steam generator has a longitudinal direction aligned with a main flow direction, and in that the steam turbine shaft is arranged parallel to the longitudinal direction of the heat recovery steam generator.

12. A combined cycle power plant according to claim 1 , wherein at least one of the medium pressure steam turbine and the high pressure steam turbine is table mounted and in that the high pressure life steam pipe has an extension in vertical direction and/or that the medium pressure hot reheat steam pipe has an extension in vertical direction such that due to pipe's thermal expansion during operations, a thermal expansion of part of the at least one bundle is compensated.

13. The combined cycle power plant of claim 1 , wherein the vertically arranged heat exchanger pipes are disposed within a superheater section of the HRSG.

14. The combined cycle power plant of claim 1 , wherein the vertically arranged heat exchanger pipes are disposed within a reheater section of the HRSG.

Assignees

• General Electric Technology Gmbh
• Gen Electric

Inventors

• Arnold Raimond
• Ruchti Christoph
• Selby Glenn T

Classifications

• Y02E20/16

  Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT] · CPC title

• F22B37/205

  Supporting and spacing arrangements for tubes of a tube bundle · CPC title

• F22G3/008

  Protection of superheater elements, e.g. cooling superheater tubes during starting-up periods, water tube screens · CPC title

• F01K23/106 Primary

  with water evaporated or preheated at different pressures in exhaust boiler · CPC title