Method and device for cooling guide vanes in a gas turbine plant
AssigneeAsea Brown Boveri AG
InventorsAlexander Beeck, Jörgen Ferber, Jakob Keller
Life of this patent
Estimating the term…
Abstract
The temperature can nowadays be reduced by about 400° C. as a result of the cooling of the guide vane (15) of the first guide wheel. The many film bores leading outward from the guide vane (15) must therefore remain free of blockages or deposits caused by suspended matter in the cooling medium. Only pure gas must therefore be used as the cooling medium for the first guide wheel. This purpose is served by a dust separator which is designed advantageously as an axial cyclone (24, 24′). The latter has no moving structural parts, has a simple design, is therefore insusceptible to faults and can be exposed to high temperatures. The axial cyclone is a centrifugal deduster without gas stream reversal.
Claims7
A method for the cooling of guide vanes in a gas turbine plant comprising the steps of:
- providing a compressor, at least one combustion chamber, at least one turbine having at least one first guide wheel with guide vanes, and at least one dust separator;
- supplying part of an impure gas flowing through the compressor to the at least one dust separator, the impure gas including suspended matter;
- separating suspended matter from the impure gas by centrifugal force with the at least one dust separator, so that a pure gas is formed;
- guiding the pure gas into the interior of the guide vanes of the at least one first guide wheel;
- and
- guiding a gas separated in the at least one dust separator and laden with suspended matter to a location in the turbine selected from the group consisting of:
- (a) a cooling-air space surrounding the combustion chamber;
- and
- (b) directly into the combustion chamber.
Dependencies are inferred from the claim text.