Power plants – Combustion products used as motive fluid
Reexamination Certificate
1998-12-15
2001-03-13
Freay, Charles G. (Department: 3746)
Power plants
Combustion products used as motive fluid
C060S039511, C060S039550
Reexamination Certificate
active
06199363
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method for operating a gas turbogenerator set.
BACKGROUND OF THE INVENTION
In a gas turbogenerator set of the prior art, with a downstream recuperator for utilizing the heat of the exhaust gases from a turbine belonging to the gas turbogenerator set, it can generally be found that the heat yield from the still relatively hot exhaust gases is deficient, with the result that flue gases, the temperature of which may well still amount to 250° C., are discharged. This situation is aggravated in sequentially fired gas turbogenerator sets, since, in these, only about 60% of the available compressed air can be passed through the recuperator. By contrast, the recuperator is subjected to exhaust gas to the extent of about 103%, so that it can easily be seen from this that only some of the heat potential of these exhaust gases can be utilized. In order to seek a remedy for this, it has become known to place a second recuperator downstream of the first: by means of this measure, the remaining heat potential of the exhaust gases is to be utilized even further here, preferably by attempts to provide a steam quantity which is then introduced into a steam turbine. However, high-grade steam cannot be provided in this way, so that such a measure results per se in a high loss of exergy.
SUMMARY OF THE INVENTION
The object of the invention is to achieve a maximization of efficiency in the method of the type initially mentioned.
This is achieved, according to the invention, by connecting a steam generator in parallel with a recuperator on the exhaust gas side. The steam generator utilizes for steam generation the exhaust gas stream which is caused by the cooling air streams and which cannot be cooled in the recuperator, the generated steam being introduced preferably downstream of the secondary flow path of the recuperator.
The essential advantage of the invention is to be seen in that the exhaust gases from the turbine are optimally cooled to a good effect, this resulting in maximum efficiency.
The method achieves its greatest efficiency when it is combined with approximately isothermal compression in the compressor unit.
Advantageous and expedient developments of the solution according to the invention for achieving the object are defined in the further dependent claims.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. All the elements not necessary for an immediate understanding of the invention are omitted. The direction of flow of the media is indicated by arrows.
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“Gas turbines grab wider share of power generation duties”, J. Makansi, Editor, Generation Technology,, Mar. 1990, pp. 40-44.
Asea Brown Boveri AG
Burns Doane Swecker & Mathis L.L.P.
Freay Charles G.
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