Patent ID: 11879346
Assignee: SIEMENS ENERGY GLOBAL GMBH & CO. KG
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A method for upgrading a gas turbine arrangement which has a combustion chamber, which is lined with heat-shielding elements, and a gas turbine which is arranged downstream of the combustion chamber and comprises guide vanes and moving vanes, wherein said heat-shielding elements, which are held on an outer side of a positionally fixed supporting structure directly upstream of the gas turbine in a downward flow direction, and vane platforms of the guide vanes of a first guide vane stage, which vane platforms are held on a positionally fixed supporting structure, define annular gaps between them, the method comprising:
a) removing all the guide vanes of the first guide vane stage;
b) replacing the removed guide vanes of the first guide vane stage with new or reconditioned guide vanes,
wherein vane platforms of the new or reconditioned guide vanes are provided with cooling-air bores which fluidically connect a cooling-air supply duct, which supplies the guide vanes of the first guide vane stage with cooling air, to one of the annular gaps and open into a corresponding annular gap,
wherein the cooling-air bores are arranged in such a manner that more cooling-air bores open into regions of the annular gap or of the annular gaps that are arranged in a radial direction in a region of leading edges of the guide vanes than into other regions of the annular gap or of the annular gaps, and
wherein the gas turbine arrangement which is to be modernized has cooling-air ducts which extend through the supporting structure, in each case fluidically connect one of the cooling-air supply ducts to one of the annular gaps and open into the corresponding annular gap,
wherein a number of the new or reconditioned guide vanes does not correspond to a number of removed guide vanes, and
wherein the cooling-air ducts extending through the supporting structure are at least partially closed after step a) is carried out and before step b) is carried out.