Method of using external fluid for cooling high temperature components of gas turbine

A gas turbine and turbine technology, applied in the field of turbines, can solve problems such as reduced efficiency, reduced power potential, and reduced flame temperature

Inactive Publication Date: 2014-01-01
GENERAL ELECTRIC CO
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Problems solved by technology

Due to (a) the reduction in flame temperature due to the non-chargeable flow which reduces the combustor outlet temperature, (b) the reduction in work due to the bypass of compressed air at the upstream stage of the turbine, and (c) The reduction in efficiency occurs due to the reduction in work potential (loss of availability) caused by the dilution effect of the mixed coolant pulses in the main gas path and the associated loss of aerodynamic efficiency

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  • Method of using external fluid for cooling high temperature components of gas turbine
  • Method of using external fluid for cooling high temperature components of gas turbine
  • Method of using external fluid for cooling high temperature components of gas turbine

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Embodiment Construction

[0039] The present invention provides cooling of stationary and / or rotating hot gas path components of the gas turbine using fluid external to the gas turbine in a closed loop cooling configuration. The external fluid can be nitrogen, carbon dioxide, steam or air. Preferably, the external fluid is nitrogen, which is obtained from an air separation unit (ASU) column and then introduced into the closed loop to cool the hot gas path components of the gas turbine.

[0040] After cooling the turbine components, the heat removed with the external fluid flow is dumped into the compressor discharge casing (CDC), or into one of the stages of the multi-stage turbine. Preferably, the heated external fluid is poured into the combustor / CDC where heat can be used at the optimum point of the turbo Brayton cycle. Alternatively, heated external fluid may be poured into an appropriate downstream turbine stage when the pressure of the heated fluid is insufficient for the fluid to make it to the...

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Abstract

An external fluid (27) in a closed loop is used to cool hot gas path components of gas turbine (16). After cooling the turbine components, the heated external fluid (27) is dumped either in the compressor discharge casing (28) or in the one of the turbine's stages (16A-C). Where the external fluid (27) is nitrogen to be dumped in the turbine compressor's discharge casing (28), the nitrogen is compressed using diluent nitrogen compressors (17). Alternatively, where the external fluid (27) is nitrogen to be dumped in one of the stages (16A-C) of the turbine (16), the nitrogen is not compressed at all. The turbine blade heat exchangers (22) in the turbine stages (16A-C) through which the nitrogen passes can be connected in parallel or in series for cooling the hot gas path components in the turbine stages (16A-C). The nitrogen can optionally be mixed with air or steam or not mixed at all.

Description

technical field [0001] The present invention relates to turbines, and more particularly, to an arrangement for cooling high temperature components of a gas turbine using a fluid external to the gas turbine for a process power plant. Background technique [0002] Open-loop air cooling of the stationary and rotating components of the gas turbine of an integrated gasification combined cycle (IGCC) power plant utilizing air extracted from the compressor reduces the efficiency of the turbine's Brayton cycle (i.e., the thermodynamic cycle that describes the operation of the gas turbine) efficiency. Due to (a) the reduction in flame temperature due to the non-chargeable flow which reduces the combustor outlet temperature, (b) the reduction in work due to the bypass of compressed air at the upstream stage of the turbine, and (c) Efficiency reduction occurs due to the reduction in work potential (loss of availability) caused by the dilution effect of the mixed coolant pulsations in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D25/12F01D5/18
CPCF02C7/18Y02E20/16Y02E20/18
Inventor K·蒙德拉A·K·阿南德V·穆泰亚
Owner GENERAL ELECTRIC CO
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