Gas turbine and method for protecting a gas turbine during shaft breakage

摘要

The invention relates to a gas turbine comprising a turbine (50), a compressor (30) upstream of the turbine (50) and an axially extending main shaft (81) connecting the turbine (50) to the compressor (30) , There is provided an auxiliary shaft (6) coaxial with the main shaft (81), the auxiliary shaft (6) having a first shaft portion (61) and a second shaft portion (62) separated by a gap (75). wherein the first shaft portion (61) is connected to the compressor (30) and the second shaft portion (62) is connected to the turbine (50). The two shaft sections (61, 62) have mutually corresponding structures (610, 620) at their mutually facing ends (61a, 62a). The gap (75) between the two shaft sections (61, 62) is dimensioned in such a way that, when the main shaft (81) breaks due to a different rotational speed of the two shaft sections (61, 62), the structures (610, 620) corresponding to one another mutually facing ends (61a, 62a) of the two shaft portions (61, 62) interact and rotate relative to each other. In this case, mutually corresponding structures are formed such that the two shaft sections (61, 62) are moved away from one another in such a rotation of the two shaft sections (61, 62). The invention further relates to a method for protecting a gas turbine during shaft breakage.