Combustor and gas turbine

• US 10,641,492 B2
• Filed: 09/18/2015
• Issued: 05/05/2020
• Est. Priority Date: 09/25/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Tsunoda, Naoki, Takiguchi, Satoshi, Akamatsu, Shinji, Nishida, Koichi, Tanaka, Katsunori
• Primary Examiner(s): Sung, Gerald L
• Application Number:
  US15/512,786
• Publication Number:
  US 20170284672A1
• Time in Patent Office: 1,691 Days
• CPC Class Codes: F01D 9/023 Transition ducts between combustor cans and first stage of the turbine in gas-turbine engines; their cooling or sealings
• CPC Class Codes: F01L 9/12 with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
• CPC Class Codes: F02C 7/18 the medium being gaseous, e.g. air F02C7/125 takes precedence
• CPC Class Codes: F05D 2230/642 using maintaining alignment while permitting differential dilatation
• CPC Class Codes: F05D 2240/35 Combustors or associated equipment
• CPC Class Codes: F23R 2900/03042 Film cooled combustion chamber walls or domes
• CPC Class Codes: F23R 3/04 Air inlet arrangements
• CPC Class Codes: F23R 3/06 Arrangement of apertures along the flame tube
• CPC Class Codes: F23R 3/08 between annular flame tube sections, e.g. flame tubes with telescopic sections
• CPC Class Codes: F23R 3/42 characterised by the arrangement or form of the flame tubes or combustion chambers
• CPC Class Codes: F23R 3/48 Flame tube interconnectors, e.g. cross-over tubes
• CPC Class Codes: F23R 3/60 Support structures; Attaching or mounting means

Abstract

A combustor including a transition piece that defines a flow channel therein; a combustor basket inserted in the transition piece from an upstream side of the flow channel that sends a combustion gas through the flow channel and defines a gap through which a compressed air is sent with an inner peripheral surface of the transition piece; wherein the combustor basket includes a notch portion recessed from an end of the combustor basket on a downstream side toward the upstream side, and a purge air introduction hole through which the compressed air in the gap is introduced into the notch portion.

Claims

1. A combustor comprising:

a transition piece that defines a flow channel therein;

a combustor basket inserted in the transition piece from an upstream side of the flow channel that sends a combustion gas through the flow channel and defines a gap through which a compressed air is sent between an inner peripheral surface of the transition piece and the combustor basket;

wherein

the combustor basket includes

a notch portion recessed from an end of the combustor basket on a downstream side toward the upstream side and having a shape that corresponds to a connecting pipe that opens along the inner peripheral surface of the transition piece, and

a purge air introduction hole through which the compressed air in the gap is directly introduced into the notch portion,

wherein the purge air introduction hole includes a plurality of first through-holes, and

wherein the plurality of first through-holes are provided along an axial direction of the combustor.

2. The combustor according to claim 1, wherein

the combustor basket includes a protruding portion formed along an edge of the notch portion that protrudes in a direction away from the flow channel, and the plurality of first through-holes pass through the protruding portion.

3. The combustor according to claim 2, wherein each of the plurality of first through-holes decreases in inner diameter dimension from the upstream side toward the downstream side.

4. The combustor according to claim 2, wherein each of the plurality of first through-holes increases in inner diameter dimension from the upstream side toward the downstream side.

5. A gas turbine comprising:

a plurality of the combustors according to claim 1, wherein the plurality of combustors are connected to each other via the connecting pipe.

6. The combustor according to claim 1, wherein the plurality of first through-holes extend toward the notch portion.

7. The combustor according to claim 1, wherein the purge air introduction hole further comprises a plurality of second through-holes which are formed in a direction intersecting the axial direction of the combustor.

8. The combustor according to claim 7, wherein the notch portion includes an arcuate portion with an arcuate shape, and linear portions with a rectilinear shape that extend from the arcuate portion towards a downstream edge of the combustor basket,

the plurality of first through-holes, which are formed along the axial direction of the combustor, are formed in the arcuate portion, and

the plurality of second through-holes, which are formed in the direction intersecting the axial direction, are formed in the linear portions.