Exhaust gas liner for a gas turbine and gas turbine with such an exhaust gas liner

1. An exhaust gas liner for a gas turbine comprising: an annular inner shell and an annular outer shell, which are arranged concentrically around a machine axis (A) of said gas turbine to define an annular exhaust gas channel in between said annular inner and outer shell, whereby said annular inner shell and/or said annular outer shell are composed of a plurality of first and second liner segments, respectively, which are attached to a support structure,

wherein each of said plurality of first and second liner segments is fixed to said support structure at a plurality of first fixation spots, which is distributed over an area of each of said plurality of first and second liner segments, respectively, such that said plurality of first and second liner segments are clamped to said support structure throughout an engine thermal cycle without hindering thermal expansion,

wherein each of said plurality of first and second liner segments is fixed on said support structure at each of said plurality of first fixation spots by means of a first fixation bolt that is attached to a first fixation pin,

wherein said first fixation pin is fixed on said support structure by means of a first fixation pipe, which is fixed at one end on said support structure and receives said first fixation pin at another end, which is open,

wherein said annular inner shell and said annular outer shell are connected by means of a plurality of radial struts, and each of said plurality of radial struts comprises a respective radial rib, wherein each of said radial rib is covered by a respective front strut segment and a respective rear strut segment, wherein each of said plurality of radial struts having a leading edge and a trailing edge, wherein each of said front strut segment is fixed on said respective radial rib at a plurality of second fixation spots distributed along said leading edge of each of said plurality of radial struts and wherein each of the rear strut segment is fixed on said respective radial rib, respectively, at a plurality of third fixation spots distributed along said trailing edge of each of said plurality of radial struts.

2. The exhaust gas liner as claimed in claim 1 , wherein each of said plurality of first fixation spots of said first and second liner segments comprises a central fixation spot, where said plurality of first and second liner segments are fixed on said support structure such that a movement at the central fixation spot of each of said plurality of first and second liner segments in an axial, radial and tangential direction (x, R, θ) is prevented.

3. The exhaust gas liner as claimed in claim 2 , wherein said first fixation bolt that corresponds to said central fixation spot of each of said plurality of first and second liner segments is screwed through a holder at a backside of each of said plurality of first and second liner segments into said first fixation pin being fixed on said support structure.

4. The exhaust gas liner as claimed in claim 2 , wherein each of said first and second liner segments comprises an axially guiding fixation spot located on an axial centerline of each of said plurality of first and second liner segments, where said plurality of first and second liner segments are fixed on said support structure such that the movement at the axially guiding fixation spot of each of said plurality of first and second liner segments in the tangential direction (θ) is prevented.

5. The exhaust gas liner as claimed in claim 4 , wherein each of said plurality of first and second liner segments is fixed at said axially guiding fixation spot by means of an axial guide pin, which is fixed to a holder at a backside of each of said plurality of first and second liner segments and engages, in a sliding fashion, a second fixation pin being fixed on said support structure.

6. The exhaust gas liner as claimed in claim 2 , wherein said exhaust gas liner can be separated into two parts at a parting line, and that each of said plurality of first fixation spots of said first and second liner segments except a plurality of split line segments of said inner annular shell abutting said parting line, comprises four side fixation spots located at four edges of each of said plurality of first and second liner segments, where said plurality of first and second liner segments are fixed on said support structure such that the movement at the four side fixation spots of each of said plurality of first and second liner segments in the radial direction (R) is prevented but a thermal expansion composed of the axial and tangential components is allowed.

7. The exhaust gas liner as claimed in claim 6 , wherein each of said plurality of first and second liner segments is fixed at each of said side fixation spots by means of said first fixation bolt, which is screwed through a holder at a backside of each of said plurality of first and second liner segments into said first fixation pin being fixed on said support structure, whereby said holder comprises an elongated hole with location specific orientation and length.

8. The exhaust gas liner as claimed in claim 1 , wherein each of said plurality of second and third fixation spots of each of said front and rear strut segments, respectively, has three fixation spots comprising a middle fixation spot, a hub side fixation spot and a tip side fixation spot.

9. The exhaust gas liner as claimed in claim 8 , wherein at the middle fixation spot of each of the front strut segments a second fixation bolt is used to fix each of said front strut segments in an axial, radial, and tangential direction (x, R, θ), while at the hub and tip side fixation spots of each of the front segments a thermal expansion in the radial direction (R) is allowed.

10. The exhaust gas liner as claimed in claim 8 , wherein at the middle fixation spot of each of the rear strut segments, a second fixation bolt is used to fix each of said rear strut segment thereby allowing a thermal expansion in an axial direction only, while at the hub and tip side fixation spots of each of said rear strut segments a thermal expansion in a radial and the axial direction (R, x) is allowed.

11. A gas turbine comprising a compressor, at least one combustor and one turbine, and an exhaust gas liner according to claim 1 , through which hot exhaust gas exits said gas turbine.