Foreign substance removal apparatus for gas turbine

Patent metadata

Field	Value
Publication number	US-10472991-B2
Application number	US-201615286074-A
Country	US
Kind code	B2
Filing date	Oct 5, 2016
Priority date	Oct 5, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A foreign substance removal apparatus for a gas turbine includes a combustor casing having a first cooling air passage formed in a tangential direction of a combustor in a gas turbine in order to move cooling air into the combustor, a first foreign substance collection unit disposed on a flow path in the first cooling air passage in order to primarily filter foreign substances contained in the cooling air, a second cooling air passage extending radially toward a turbine blade in a circumferential direction of a torque tube located in the combustor, and a second foreign substance collection unit disposed on a flow path in the second cooling air passage and communicating with the second cooling air passage to secondarily filter foreign substances contained in the cooling air introduced through the first cooling air passage.

First claim

What is claimed is:

1. A foreign substance removal apparatus for a gas turbine, comprising:
a torque tube;
a combustor casing having an inner surface enclosing a region of the torque tube;
a first cooling air passage communicating at one end with a hollow region inside the combustor casing and communicating at another end with an outer surface of the combustor casing in order to move cooling air into the hollow region;
a first foreign substance collection unit including one of a groove or a slit that is formed in the inner surface of the combustor casing and communicates with the hollow region to primarily filter foreign substances contained in the cooling air passing through the first cooling air passage and the hollow region;
a second cooling air passage having a first end that communicates with the first cooling pair passage and a second end that extends toward a turbine blade, the second cooling air passage formed in the torque tube in the enclosed region to surround a central axis of the torque tube and to have an incline such that the second end is farther from the central axis than the first end; and
a second foreign substance collection unit that is disposed at the second end of the second cooling air passage and communicates with the second cooling air passage to secondarily filter foreign substances contained in the cooling air introduced through the first cooling air passage.

2. The foreign substance removal apparatus according to claim 1 , wherein the first cooling air passage includes a plurality of first cooling air passages arranged in a circumferential direction of the combustor casing, high-pressure air compressed by a compressor provided in the gas turbine being supplied to the first cooling air passage.

3. The foreign substance removal apparatus according to claim 1 , wherein the first cooling air passage has a reduced diameter in a longitudinal direction thereof.

4. The foreign substance removal apparatus according to claim 1 , wherein the first cooling air passage has a spiral groove portion formed therein.

5. The foreign substance removal apparatus according to claim 1 , wherein the first cooling air passage has a path bent at a lower end thereof toward the second cooling air passage of the torque tube.

6. The foreign substance removal apparatus according to claim 1 , wherein the groove has a uniform diameter with respect to the central axis of the torque tube and the slit extends in a circumferential direction of the combustor casing by a predetermined length.

7. The foreign substance removal apparatus according to claim 1 , wherein the first foreign substance collection unit obliquely extends rearward of the combustor casing in a circumferential direction thereof.

8. The foreign substance removal apparatus according to claim 1 , wherein the first foreign substance collection unit is one of a groove and a slit extending inward of the torque tube facing the first cooling air passage by a predetermined length.

9. The foreign substance removal apparatus according to claim 1 , wherein:
the first foreign substance collection unit includes a plurality of first foreign substance collection units extending in a circumferential direction of the combustor casing and in an inward direction of the torque tube, the first foreign substance collection units facing each other; and
the foreign substances in the cooling air introduced through the first cooling air passage are respectively collected at a circumferential position of the combustor casing and an inward position of the torque tube.

10. The foreign substance removal apparatus according to claim 9 , wherein the plurality of first foreign substance collection units are spaced apart from each other in a longitudinal direction of the combustor casing.

11. The foreign substance removal apparatus according to claim 1 , wherein the first foreign substance collection unit is disposed in a circumferential direction of the combustor casing, and comprises a first chamber facing an inner upper portion of the combustor casing and a first filter part provided in the first chamber.

12. The foreign substance removal apparatus according to claim 11 , wherein the first chamber comprises a plurality of unit filters filtering foreign substances having different sizes.

13. The foreign substance removal apparatus according to claim 12 , wherein each of the unit filters has a dense mesh spacing as directed outward in the circumferential direction of the combustor casing.

14. The foreign substance removal apparatus according to claim 12 , wherein the unit filters are spaced apart from each other.

15. The foreign substance removal apparatus according to claim 14 , wherein when the unit filters are spaced apart from each other, a distance (L) therebetween is relatively greater than that corresponding to a whole thickness (t) of the unit filters.

16. The foreign substance removal apparatus according to claim 1 , wherein the second cooling air passage has a uniform diameter.

17. The foreign substance removal apparatus according to claim 1 , wherein the second foreign substance collection unit is located above the second cooling air passage.

18. The foreign substance removal apparatus according to claim 1 , wherein the second foreign substance collection unit is disposed in the circumferential direction of the torque tube, and comprises:
a diameter reduction part having a reduced diameter as directed outward from a center thereof in a radial direction of the torque tube; and
a second chamber formed above the diameter reduction part and having a space for storage of collected foreign substances.

19. The foreign substance removal apparatus according to claim 1 , wherein the turbine blade is a first turbine blade mounted to a first-stage disk adjacent to the combustor.

20. The foreign substance removal apparatus according to claim 1 , wherein the first foreign substance collection unit communicates with the second foreign substance collection unit in sequence via the hollow region, a swirler formed in the torque tube, and the second cooling air passage.

Assignees

• Doosan Heavy Ind & Construction Co Ltd
• Doosan Heavy Ind Constr Co Ltd

Inventors

• Kim Kyung Kook

Classifications

• F02C7/052

  with dust-separation devices · CPC title

• F05D2260/607

  Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles · CPC title

• F02C7/18

  the medium being gaseous, e.g. air {(F02C7/125 takes precedence)} · CPC title

• B01D2267/40

  Different types of filters · CPC title

• F05D2240/35

  Combustors or associated equipment · CPC title