System and method for managing heat duty for a heat recovery system

Patent metadata

Field	Value
Publication number	US-10612422-B2
Application number	US-201816121900-A
Country	US
Kind code	B2
Filing date	Sep 5, 2018
Priority date	Dec 21, 2016
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A system includes an HRSG that includes a plurality of heat exchanger sections fluidly coupled to each other. The plurality of heat exchanger sections comprises at least one economizer, at least one evaporator, at least one reheater, and at least one superheater. In addition, the HRSG includes an additional heat exchanger section coupled to two different heat exchanger sections of the plurality of heat exchanger sections. Further, the HRSG includes a controller programmed to selectively fluidly couple the additional heat exchanger section to one of the two different heat exchanger sections to alter a heat duty for the selected heat exchanger section fluidly coupled to the additional heat exchanger.

First claim

The invention claimed is:

1. A system, comprising:
a controller for a heat recovery steam generator (HRSG), wherein the HRSG comprises a plurality of heat exchanger sections that are fluidly coupled together, the plurality of heat exchanger sections comprises at least one economizer, at least one evaporator, at least one reheater, and at least one superheater, wherein the controller comprises:
a memory storing instructions to perform operations of the HRSG; and
a processor configured to execute the instructions, wherein the instructions, when executed by the processor, cause the controller to:
selectively fluidly couple an additional heat exchanger section to one of two different heat exchanger sections that the additional heat exchanger section is coupled to to alter a heat duty for the selected heat exchanger section fluidly coupled to the additional heat exchanger section, wherein the plurality of heat exchanger sections comprises the two different heat exchanger sections.

2. The system of claim 1 , wherein the two different heat exchanger sections comprise the at least one reheater and the at least one superheater.

3. The system of claim 1 , wherein the two different heat exchanger sections comprise the at least one superheater and the at least one evaporator.

4. The system of claim 1 , wherein the two different heat exchanger sections comprise the at least one evaporator and at least one economizer.

5. The system of claim 1 , wherein the two different heat exchanger sections comprise the at least one economizer and the at least one superheater.

6. The system of claim 1 , wherein a parallel circuit is formed between the additional heat exchanger section and the selected heat exchanger section when fluidly coupled together.

7. The system of claim 1 , wherein the controller is configured to not selectively fluidly couple the additional heat exchanger section to any of the two different heat exchanger sections when the heat duty of two different heat exchanger sections is sufficient.

8. The system of claim 1 , wherein the controller is configured to selectively fluidly couple the additional heat exchanger section to one of the two different heat exchanger sections to increase the heat duty for the selected heat exchanger section.

9. The system of claim 1 , comprising a first set of valves disposed between the additional heat exchanger section and a first heat exchanger section of the two different heat exchanger sections, and a second set of valves disposed between the additional heat exchanger section and a second heat exchanger section of the two different heat exchanger sections, wherein the controller is configured to cause the first set of valves to be open to form a parallel circuit between the additional heat exchanger section and a first heat exchanger section while keeping the second set of valves closed.

10. The system of claim 1 , comprising a combined cycle power plant comprising the HRSG.

11. A heat recovery system configured to recover heat from a fluid, comprising:
a controller for the heat recovery system, wherein the heat recovery system comprises a plurality of heat exchanger sections fluidly coupled to each other, and the plurality of heat exchanger sections comprise a first heat exchanger section and a second heat exchanger section, and the controller comprises:
a memory storing instructions to perform operations of the heat recovery system; and
a processor configured to execute the instructions, wherein the instructions, when executed by the processor, cause the controller to:
selectively fluidly couple an additional heat exchanger section to either the first heat exchanger section or the second heat exchanger section to alter a heat duty for the selected heat exchanger section fluidly coupled to the additional heat exchanger section, wherein the additional heat exchanger section is coupled to both the first heat exchanger section and the second heat exchanger section.

12. The heat recovery system of claim 11 , wherein the first heat exchanger section comprises a reheater and the second heat exchanger section comprises a superheater.

13. The heat recovery system of claim 11 , wherein the first heat exchanger section comprises a superheater and the second heat exchanger section comprises an evaporator.

14. The heat recovery system of claim 11 , wherein first heat exchanger section comprises at least one evaporator and the second heat exchanger section comprises an economizer.

15. The heat recovery system of claim 11 , wherein first heat exchanger section comprises an economizer and the second heat exchanger section comprises a superheater.

16. The heat recovery system of claim 11 , wherein a first parallel circuit is formed between the additional heat exchanger section and the first heat exchanger section when fluidly coupled together, and a second parallel circuit is formed between the additional heat exchanger section and the second heat exchanger section when fluidly coupled together.

17. The heat recovery system of claim 16 , comprising a first set of valves disposed along the first parallel circuit between the additional heat exchanger section and the first heat exchanger section, and a second set of valves disposed along the second parallel circuit between the additional heat exchanger section and the second heat exchanger section, wherein the controller is configured to cause the first set of valves to be open while keeping the second sets of valves closed when utilizing the first parallel circuit, and the controller is configured to cause the second set of valves to be closed while keeping the first set of valves closed when utilizing the second parallel circuit.

18. The heat recovery system of claim 11 , wherein the controller is configured to not selectively fluidly couple the additional heat exchanger section to the first heat exchanger section and the second heat exchanger section when the heat duty of both the first and second heat exchanger sections is sufficient.

19. The heat recovery system of claim 11 , wherein the controller is configured to selectively fluidly couple the additional heat exchanger section to either the first heat exchanger section or the second heat exchanger section to increase the heat duty for the selected heat exchanger section.

20. A heat recovery system configured to recover heat from a fluid, comprising:
a controller for the heat recovery system, wherein the heat recovery system comprises a plurality of heat exchanger sections fluidly coupled to each other, and the plurality of heat exchanger sections comprise a first heat exchanger section and a second heat exchanger section, and the controller comprises:
a memory storing instructions to perform operations of the heat recovery system; and
a processor configured to execute the instructions, wherein the instructions, when executed by the processor, cause the controller to:
selectively fluidly couple an additional heat exchanger section to either the first heat exchanger section or the second heat exchanger section to alter a heat duty for the selected heat exchanger section fluidly coupled to the additional heat exchanger section, wherein the controller is configured to cause a first set of valves disposed along a first parallel circuit formed between the additional heat exchanger section and the first heat exchanger section to be open while keeping a second set of valves disposed along a second parallel circuit formed between the additional heat exchanger section and the second heat exchanger section closed

Assignees

• Gen Electric

Inventors

• Magee Jeffrey Fredrick

Classifications

• F01K13/02

  Controlling, e.g. stopping or starting · CPC title

• F01K7/08

  Control means specially adapted therefor · CPC title

• F01K3/265 Primary

  using live steam for superheating or reheating · CPC title

• F01K7/04

  Control means specially adapted therefor · CPC title

• F01K23/10

  with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) · CPC title