Diffuser for the exhaust section of a gas turbine and gas turbine
A technology of gas turbine and diffuser, which is applied in the direction of gas turbine installation, machine/engine, climate sustainability, etc., and can solve problems such as fixed hazards
Active Publication Date: 2014-01-22
ANSALDO ENERGIA IP UK LTD
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- Description
- Claims
- Application Information
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Problems solved by technology
[0010] Experience has further shown that nuts fastened to bolts by means of welds break off, thereby putting the fastening at risk
Method used
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[0067] Characteristic feature of the present invention can be summarized as follows:
[0068] For each liner segment there is only one fixing point, wherein the fixing means connect the liner segment to the underlying support structure;
[0069] The bushing segments are free to thermally expand without stress in different (lateral) directions outside the fixing point;
[0070] adjacent liner segments overlap to protect the underlying spacer from hot exhaust flow;
[0071] The overlapping sections (strips) are formed by bending the hardened liner segments, thereby reducing the natural resonance of the segments;
[0072] The C-shaped profile used to establish the expansion-tolerant connection between the liner segment and the support structure is welded to the liner segment circumferentially and is small enough to always have the same temperature as the liner segment so that the profile and thermal stress between segments;
[0073] The fixed points / fixtures only fix the plane...
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The invention relates to a diffuser (11) for the exhaust section of a gas turbine (10), comprising at least one cone (13, 14) extending along a machine axis and bordering a channel for an exhaust flow, whereby said at least one cone (13, 14) has a wall with an internal structure comprising a plurality of longitudinal liner segments (29) extending in axial direction and establishing a conical liner (15a,b) being in contact with the exhaust flow, a support structure (17a,b) coaxially arranged with respect to said conical liner (15a,b) in a predetermined distance, and an insulation (16a,b) filling the space between said conical liner (15a,b) and said support structure (17a,b). A smooth inner surface and a safe compensation of different thermal expansions are achieved by having each of said liner segments (29, 30) fixed in lateral direction at one fixing point (35), and having each liner segment (29, 30) supported at a plurality of distributed points outside said fixing point (35) by means of supporting elements (26a,b, 31a,b), which are confined to the space between said conical liner (15, 15a,b) and said support structure (17, 17a,b) and allow for a lateral thermal expansion of the liner segments (29, 30).
Description
technical field [0001] The present invention relates to gas turbines. It refers to a diffuser for an exhaust section of a gas turbine according to the preamble of claim 1 . It further refers to a gas turbine having such a diffuser. Background technique [0002] In gas turbines, especially those used in combined cycle applications, the exhaust gas temperature is so high that the support structure of the exhaust duct is no longer allowed to come into contact with the exhaust gas. Therefore, the support structure of the exhaust duct has to be protected by means of a spacer, which in turn has to be covered and protected by a liner segment. Such exhaust ducts and diffusers are disclosed, for example, in documents US 5,104,286 A, US 5,669,812 A and US 6,807,803 B2. [0003] figure 1 The principle configuration of the exhaust section of such a gas turbine is shown. Exhaust gases emerging from the gas turbine 10 expand in a conical diffuser 11 and then enter an exhaust duct 12 ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01D25/30
CPCF02C7/24Y02T50/675F01D25/30F02K1/822F05D2230/642Y02T50/60F02C7/00F02C7/20F02K1/04F02K1/80
Inventor E.布雷维尔勒
Owner ANSALDO ENERGIA IP UK LTD