Turbine guide vane support for a gas turbine and method for operating a gas turbine

A turbine guide vane support for a gas turbine, comprising:

• a tubular wall with an inflow end and an outflow end, the outflow end being at an opposite end from the inflow end;
• an interior for a hot gas flowing in a flow path of the turbine guide vane support;
• a plurality of cooling channels for a coolant located in the tubular wall, wherein the cooling channels are distributed over a periphery, each cooling channel extending from a coolant inlet to a coolant outlet,
• wherein the cooling inlet is arranged at the outflow end of the turbine guide vane support,
• wherein the cooling outlet is arranged at the outflow end of the turbine guide vane support, and
• wherein each cooling channel
• connects the cooling inlet to the cooling outlet,
• extends in an axial direction from the cooling inlet to a diversion region, which is arranged at the inflow end of the turbine guide vane support, and
• extends in the axial direction from the diversion region back to the cooling outlet.

A method of operating a gas turbine, comprising:

• providing and using a coolant
• for cooling turbine blades and/or vanes or wall segments, and/or
• for blocking gaps which open out in a hot gas path,
• wherein the coolant cools a turbine guide vane support
• before the coolant cools the turbine blades and/or vanes or wall segments, and/or
• before the coolant blocks the gaps.