Stator heat shield segment for a gas turbine power plant

Patent metadata

Field	Value
Publication number	US-2018100409-A1
Application number	US-201715727112-A
Country	US
Kind code	A1
Filing date	Oct 6, 2017
Priority date	Oct 8, 2016
Publication date	Apr 12, 2018
Grant date	—

Abstract

A stator heat shield segment for a gas turbine includes an inner surface facing a hot gas main flow of the gas turbine; an outer surface opposite to the inner surface and at least partially exposed to cooling air; a first impingement cavity provided with a plurality of first impingement holes fluidly connected with the cooling air supplied outside the outer surface; a feeding cavity isolated from the cooling air supplied outside the outer surface and fluidly connected with first impingement cavity; and a second impingement cavity provided with a plurality of second impingement holes fluidly connected to the feeding cavity.

First claim

1 . A stator heat shield segment for a gas turbine, the stator heat shield segment comprising:
an inner surface for facing a hot gas main flow path of a gas turbine; an outer surface opposite to the inner surface and configured for at least partial exposure to cooling air; first impingement cavity provided with a plurality of first impingement holes for being fluidly connected with cooling air supplied outside the outer surface; a feeding cavity isolated from a path of cooling air to be supplied outside the outer surface and fluidly connected with first impingement cavity; and a second impingement cavity provided with a plurality of second impingement holes and being fluidly connected to the feeding cavity.

2 . Segment as claimed in claim 1 , wherein the first and the second impingement cavities are arranged beside one another in parallel with respect to the inner surface and are separated by a partition wall.

3 . Segment as claimed in claim 2 , wherein the partition wall comprises:
at least a bypass cooling hole.

4 . Segment as claimed in claim 2 , wherein the feeding cavity is arranged above the second impingement cavity and above a portion of the first impingement cavity next to the second impingement cavity.

5 . Segment as claimed in claim 4 , wherein the first impingement cavity and the feeding cavity are a common cavity which is S-shaped.

6 . Segment as claimed in claim 4 , wherein the first impingement cavity and the feeding cavity are fluidly connected through at least an opening, the inner surface of the first impingement cavity facing the opening which includes a plurality of flow barrier elements.

7 . Segment as claimed in claim 6 , wherein entire inner surfaces of the first impingement cavity and of the second impingement cavity include a plurality of flow barrier elements.

8 . Segment as claimed in claim 7 , wherein the flow barrier elements comprise:
at least one of ribs or pins, or dimples.

9 . Segment as claimed in claim 1 , wherein the first impingement cavity and the second impingement cavity are laterally closed by lateral walls.

10 . Segment as claimed in claim 9 , wherein the feeding cavity is closed above by a roof wall and laterally is opened and connected to an adjacent segment.

11 . Segment as claimed in claim 1 , comprising:
discharge holes fluidly connected to the second impingement cavity.

12 . Segment as claimed in claim 1 , comprising:
additively manufactured material.

13 . A stator heat shield comprising:
a plurality of stator heat shield segments as claimed in claim 1 .

14 . The stator heat shield as claimed in claim 13 , comprising:
a first series of the plurality of stator heat shield segments which are arranged to be laterally adjacent to one another.

15 . The stator heat shield as claimed in claim 14 , comprising:
a second series of the plurality of stator heat shield segments which are symmetrically arranged with respect to the first series.

16 . A gas turbine energy plant comprising:
a rotor; a compressor; at least one combustion chamber; and at least a turbine provided with a plurality of row of blades, supported by the rotor, interposed by a plurality of vanes supported by a vane carrier, wherein the vane carrier includes at least one stator heat shield as claimed in claim 13 .

Assignees

• Ansaldo Energia Switzerland AG

Inventors

• Cochet Magali
• Sedlov Andrey
• Plodistyy Maxim

Classifications

• F01D25/14 Primary

  Casings modified therefor (double casings F01D25/26) · CPC title

• F01D11/24

  by selectively cooling-heating stator or rotor components · CPC title

• F02C7/24 Primary

  Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) · CPC title

• F01D25/12

  Cooling · CPC title

• F05D2260/201

  by impingement of a fluid · CPC title