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System design and cooling method for LP steam turbines using last stage hybrid bucket

a technology of steam turbines and cooling systems, applied in the direction of liquid fuel engines, machines/engines, mechanical equipment, etc., can solve the problems of reducing reliability, blades contributing to higher disk stresses, and low performan

Inactive Publication Date: 2007-12-20
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]This invention expands the hybrid blade concept by providing a steam turbine system designed for use in conjunction with hybrid last stage(s) LP buckets. In particular, the present invention provides a system that can cool the bucket tip region during low VAN windage conditions whereby the beneficial design and efficiency outcomes of the use of hybrid blades can be realized.

Problems solved by technology

This increasing section area of the blade at lower spans contributes to excessive flow blockage at the root and thus lower performance.
The weight of the blade contributes to higher disk stresses and thus to potentially reduced reliability.
Another issue relating to the use of hybrid steam turbine blades, however, relates to cost as a function of temperatures experienced by such blades during use.

Method used

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  • System design and cooling method for LP steam turbines using last stage hybrid bucket
  • System design and cooling method for LP steam turbines using last stage hybrid bucket
  • System design and cooling method for LP steam turbines using last stage hybrid bucket

Examples

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Embodiment Construction

[0017]FIG. 1 is a schematic diagram of a double-flow, low pressure turbine 10 including a turbine casing 12, rotor 14 and a plurality of wheels in two turbine sections indicated at 16, 18. The areas 20, 22 circled in dotted lines represent the radially outermost regions of the last stage blades that have been shown to experience the most windage heating during partial load conditions. Thus, in example embodiments of the invention, steam or water injection, steam extraction, and / or water sprays are used to cool the nozzles and / or buckets of the last stage(s), so that the advantages of hybrid blades for such stage(s) can be realized.

[0018]FIG. 2 schematically shows an example construction of a hybrid steam turbine blade 24. The steam turbine blade includes a shank portion 26 and an airfoil portion 28. The airfoil portion has an operating temperature range, a design rotational speed, a blade root attached to the shank portion, a blade tip, and a radial axis extending outward toward the...

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Abstract

A steam turbine system for use in conjunction with hybrid last stage(s) LP buckets. The system is adapted to cool the bucket tip region during low VAN windage conditions whereby the beneficial design and efficiency outcomes of the use of hybrid blades can be realized.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to a steam turbine system design to be used in conjunction with hybrid composite buckets (blades) in the last stage(s) of a steam turbine, typically a low pressure (LP) steam turbine section.[0002]Steam turbine blades operate in an environment where they are subject to high centrifugal loads and vibratory stresses. Vibratory stresses increase when blade natural frequencies become in resonance with running speed or other passing frequencies (upstream bucket or nozzle count, or other major per / rev features). The magnitude of vibratory stresses when a blade vibrates in resonance is proportional to the amount of damping present in the system (damping is comprised of material, aerodynamic and mechanical components, as well as the vibration stimulus level). For continuously coupled blades, the frequency of vibration is a function of the entire system of blades in a row, and not necessarily that of individual blades within the row.[00...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01D25/32
CPCF01D5/147F05D2220/31F01D25/12F01D5/10F01D5/18F01D5/28F01D25/08
Inventor BURDGICK, STEVEN SEBASTIANLANAUD, CHRISTOPHEFINNIGAN, PETER MICHAELLIN, WENDY WEN-LING
Owner GENERAL ELECTRIC CO
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