Steam turbine rotating blade of 52 inch active length for steam turbine low pressure application
AssigneeGeneral Electric Company
InventorsAlan R. DeMania, F. Timothy Wendell
Life of this patent
Estimating the term…
Abstract
A bucket for use in the low-pressure section of a steam turbine engine is provided. The bucket has a vane length of at least about 52 inches. The bucket is comprised of a dovetail section disposed near an inner radial position of the bucket, a tip shroud disposed near an outer radial position of the bucket and a part span shroud disposed at an intermediate radial position. The intermediate radial position is disposed at a location between the inner and outer radial positions the intermediate radial positioning adapted to promote aerodynamic performance of the part span shroud. The bucket is comprised of a chromium steel.
Claims20
A bucket for use in the low pressure section of a steam turbine, the bucket being formed with a vane length of at least about 52 inches and comprising:
- a dovetail section disposed near an inner radial position of the bucket;
- a tip shroud disposed near an outer radial position of the bucket;
- a part span shroud disposed at an intermediate radial position, the intermediate radial position located between the inner and outer radial positions on a suction side and a pressure side of the vane;
- and
- wherein the bucket is comprised of a chromium-stainless alloy.
A steam turbine comprising a low pressure turbine section, the low pressure turbine section comprising:
- a plurality of last stage buckets arranged about a turbine wheel, the plurality of last stage buckets having a vane length of about 52 inches or greater, at least one last stage bucket comprising;
- a dovetail section disposed near an inner radial position of the at least one last stage bucket;
- a tip shroud disposed near an outer radial position of the at least one last stage bucket;
- a part span shroud disposed at an intermediate radial position, the intermediate radial position located between the inner and outer radial positions, and the intermediate radial positioning being adapted to promote aerodynamic performance of the part span shroud;
- and
- wherein each of the plurality of last stage buckets are comprised of a chromium-stainless alloy.
Dependencies are inferred from the claim text.