TRANSITION DUCT FOR A GAS TURBINE CAN COMBUSTOR AND GAS TURBINE COMPRISING SUCH A TRANSITION DUCT

摘要

A transition duct for a gas turbine can combustor; the transition duct comprising: a hot shell (18) in form of an inner tubular body defining a transition channel (19) and having an upstream end and a downstream end for coupling to a can combustor combustion chamber and to a turbine respectively; a picture frame (25) at the downstream end (21) of the hot shell; a cold shell (22) comprising a first frame (27) coupled via bolts (28) to the picture frame and an outer tubular body (23,24) arranged spaced around the inner tubular body for forming a convective cooling channel; the outer tubular body being downstream connected to the first frame and having an upstream end t the upstream end of the inner tubular body; wherein the first frame and the outer tubular body are realized as separated bodies divided by a first annular gap (30) for allowing the cooling air to enter the convective cooling channel.