Power plants – Combustion products used as motive fluid
Reexamination Certificate
1998-12-10
2001-01-30
Freay, Charles G. (Department: 3746)
Power plants
Combustion products used as motive fluid
C060S039182, C060S674000
Reexamination Certificate
active
06178735
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a combined cycle power plant.
2. Discussion of Background
Isothermal compression, together with the recuperation of exhaust gas heat, is a circulation configuration which is desirable for gas turbines. In this case, the most simply practicable approximation to isothermal compression is internal cooling by means of continuous water injection. In order to recover as large a part of the water as possible again, a recooler, if need be as the last intermediate cooling stage, must be provided. Both water injection into the compressor and recooling or intermediate cooling by means of a surface heat exchanger as well as, above all, the integration of an urgently required recuperator on the air side necessitate a complete redesign and construction of the gas turbine. Such an implementing procedure is therefore ruled out on economic grounds.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to provide a novel mentioned in a combined cycle power plant of the initial invention type, to operate the gas turbine available on the market, as intended, without any modification, whilst maximizing efficiency.
This is achieved, according to the invention, by utilizing the thermodynamic effect of the recuperator in such a way that the high pressure air stream of a following hot-air turbine is heated. The latter, in turn, consists of a compressor with injection cooling, an uncooled expander and a generator. This turbo-generator set, that is to say its components, and the recuperator are assemblies currently on the market.
The essential advantage of the invention is therefore to be seen in that these assemblies do not present any problems in terms of either construction or operation on account of the very moderate circulation parameters.
The proposed circuit is also suitable for a sequentially fired gas turbo-generator set, such as may be gathered from the publication EP 0,620,363 A1.
Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. All the elements not necessary for an immediate understanding of the invention have been omitted. The direction of flow of the media is indicated by arrows.
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Asea Brown Boveri AG
Burns Doane Swecker & Mathis L.L.P.
Freay Charles G.
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