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Internal reaction steam turbine cooling arrangement

a technology of steam turbines and cooling arrangements, applied in the field of steam turbine rotor cooling, can solve the problems of degrading rotor performance, increasing the cost of rotor components, and reducing the service life of rotors,

Inactive Publication Date: 2011-06-30
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]According to a first aspect of the invention, a rotor of a turbomachine is provided. The rotor includes a rotor drum disposed at a central axis. A plurality of dovetailed buckets for a stage of the turbomachine are provided. The plurality of dovetailed buckets are secured to the rotor drum at mating surfaces within corresponding dovetailed slots cut in the rotor drum. At least one cooling passage is formed within the rotor drum for the stage of the turbomachine. A low pressure sink disposed at an upstream end of the rotor drum is receptive of a coolant flow through the cooling passage.
[0005]According to another aspect of the

Problems solved by technology

Materials that are more temperature-resistant may be used in the rotor construction, but use of such materials often substantially increases the cost of rotor components.
High pressure, lower temperature steam may be used as a coolant for the rotor, but use of this coolant from a source outside of the steam turbine can significantly increase cost of the rotor and degrade the rotor performance.

Method used

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  • Internal reaction steam turbine cooling arrangement
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Embodiment Construction

[0019]The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.

[0020]The present invention has many advantages including providing cooling for a reaction stage of a drum rotor in order to preserve life of the rotor and permit the rotor to be formed with standard rotor materials instead of expensive materials that are temperature resistant. The first stage of a rotor for a steam turbine is generally exposed to the highest temperatures and pressures. Therefore it is desirable to provide cooling in particular for the first stage section of the rotor drum. Due to negative root reaction in the first stage, the temperature out the outlet of the stage bucket will be cooler than the inlet to the stage bucket but the pressure at the outlet of the stage bucket will be higher than the pressure at the inlet. Hence steam at the outlet of the stage bucket at a higher pressure than the inlet to the stage...

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Abstract

A rotor of a turbomachine includes a rotor drum located at a central axis and a plurality of buckets secured to the rotor drum. A first reaction stage includes axial entry dovetailed buckets. An axial passage for cooling flow is provided along a mating surface between the bucket dovetail and the dovetail slot in the rotor drum. Cool steam at taken between a first stage bucket and a second stage nozzle and passed through the axial passage to a low pressure sink at an upstream end of the rotor.

Description

BACKGROUND OF THE INVENTION[0001]The invention generally relates to turbomachine rotors. More specifically, the present disclosure relates to cooling of steam turbine rotors.[0002]As steam turbine systems rely on higher steam temperatures to increase efficiency, steam turbines, especially those utilizing drum rotor construction, must be able to withstand the higher steam temperatures so as not to compromise the useful life of the rotor. Materials that are more temperature-resistant may be used in the rotor construction, but use of such materials often substantially increases the cost of rotor components. High pressure, lower temperature steam may be used as a coolant for the rotor, but use of this coolant from a source outside of the steam turbine can significantly increase cost of the rotor and degrade the rotor performance.[0003]It would be desirable to provide a low cost means to maintain the drum rotor of a turbomachine so as not to degrade rotor performance without the need to ...

Claims

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Application Information

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IPC IPC(8): F01D5/08F01D5/32
CPCF01D5/084F01D5/085F05D2220/31F01D5/323
Inventor MANI, BHASKARMURALIDHARAN, VASANTHPANDEY, VISHWAS K.NATH, VEMULA GOPINATH UPENDRA PRABHUALI, SULFICKER
Owner GENERAL ELECTRIC CO