Methods and apparatus for cooling rotary components within a steam turbine
a technology of rotary components and steam turbines, which is applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of reducing turbine performance, reducing the cooling efficiency of rotary components, so as to facilitate cooling adjacent rotating components
Inactive Publication Date: 2013-12-05
GENERAL ELECTRIC CO
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Benefits of technology
This patent describes a method for cooling a rotating component in a steam turbine, which involves channeling a cooling fluid through an outer ring and an airfoil to cool the adjacent rotating component. The patent also suggests a stationary component that includes an outer ring and an airfoil for cooling the wheelspace between the buckets and the stationary component. The technical effects of this patent are improved cooling efficiency and reduced damage to components in the steam turbine during operation.
Problems solved by technology
The design of the high-pressure (HP) and / or intermediate-pressure (IP) sections of known steam turbine engines may be complex because of the high temperatures and pressures of the steam supplied to the steam turbine and because of the creep experienced by such components.
However, limiting operating temperatures and pressures within the turbine limits the thermodynamic design space and may result in decreased turbine performance.
However, such geometries are generally more costly, reduce stage efficiency, and / or require costly, higher capability materials than designs that use an adequate cooling scheme.
Such pipes however create an obstruction within the main steam flow and add complexity to the system.
Method used
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[0014]FIG. 1 is a schematic illustration of an exemplary opposed-flow steam turbine engine 100 including a high-pressure (HP) section 102 and an intermediate-pressure (IP) section 104. An HP shell, or casing, 106 is divided axially into upper and lower half sections 108 and 110, respectively. Similarly, an IP shell 112 is divided axially into upper and lower half sections 114 and 116, respectively. In the exemplary embodiment, shells 106 and 112 are inner casings. Alternatively, shells 106 and 112 are outer casings. In the exemplary embodiment, shells 106 and 112 are sealed such that ambient air is not admitted into engine 100. A central section 118 positioned between HP section 102 and IP section 104 includes a high-pressure steam inlet 120 and an intermediate-pressure steam inlet 122.
[0015]An annular section divider 134 extends radially inwardly from central section 118 towards a rotor shaft 140 that extends between HP section 102 and IP section 104. More specifically, divider 134...
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A stationary component includes an outer ring including a first plenum, a first passageway, and a second plenum defined therein. The first passageway extends between the first plenum and the second plenum. An airfoil is disposed radially inward of the outer ring. The airfoil includes a second passageway defined therein. The second passageway is coupled in flow communication with the second plenum.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. application Ser. No. 12 / 031,049, filed Feb. 14, 2008, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]This invention relates generally to cooling a rotary component, and more specifically, to cooling a wheelspace in a stage of a steam turbine.[0003]At least some known stationary and rotating components found in steam turbine engines are subjected to temperature, pressure, and centrifugal loadings during normal operations. The design of the high-pressure (HP) and / or intermediate-pressure (IP) sections of known steam turbine engines may be complex because of the high temperatures and pressures of the steam supplied to the steam turbine and because of the creep experienced by such components. Known temperatures and pressures that satisfy the aerodynamic and thermodynamic design requirements for at least some known turbines require a corresponding acceptabl...
Claims
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CPCF01K13/006
Inventor BOWEN, MARK KEVINSWAN, STEPHEN ROGERMONTGOMERY, MICHAEL EARL
Owner GENERAL ELECTRIC CO