Diffuser for the exhaust section of a gas turbine and gas turbine with such a diffuser

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).