EP1250555B1 - Thermal shield for a component carrying hot gases, especially for structural components of gas turbines - Google Patents

Thermal shield for a component carrying hot gases, especially for structural components of gas turbines Download PDF

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Publication number
EP1250555B1
EP1250555B1 EP01914999A EP01914999A EP1250555B1 EP 1250555 B1 EP1250555 B1 EP 1250555B1 EP 01914999 A EP01914999 A EP 01914999A EP 01914999 A EP01914999 A EP 01914999A EP 1250555 B1 EP1250555 B1 EP 1250555B1
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EP
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Prior art keywords
thermal shield
elements
heat shield
cooling
arrangement according
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EP01914999A
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German (de)
French (fr)
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EP1250555A2 (en
Inventor
Peter Tiemann
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Siemens AG
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Siemens AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/02—Casings; Linings; Walls characterised by the shape of the bricks or blocks used
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/005—Sealing means between non relatively rotating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/04—Supports for linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F23M5/085—Cooling thereof; Tube walls using air or other gas as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/002—Wall structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/03044—Impingement cooled combustion chamber walls or subassemblies

Definitions

  • the invention relates to an arrangement of heat shield elements for a hot gas leading structure, in particular a metallic component of a gas turbine plant or combustion chamber.
  • the arrangement consists of a plurality of heat shield elements, which are arranged side by side on a supporting structure and anchored with this area.
  • Such an arrangement is for example from the WO 98/13645 known.
  • the heat shield component consists of a hollow arrangement with an outer shell and a small, hollow insert. Between the insert and the outer shell there is a gap which can be flowed through by the cooling fluid.
  • the insert has on the bottom side passage openings for the cooling fluid.
  • a closed cooling fluid guide is achieved in that the cooling fluid flows through channels in the support structure into the insert, flows from there through passage openings into the outer shell - the cooling takes place by impingement cooling and convection cooling - and from there flows back through separate outlet channels in the support structure.
  • the multi-shell construction of the heat shield element ensures the closed cooling fluid flow. However, such a multi-shell construction is very complicated.
  • the support structure of the combustion chamber consists of inner, intermediate and outer wall.
  • the cooling fluid in particular cooling steam, flows through an inlet into an external cooling space, from there through openings in the intermediate wall into an internal cooling space and from there to the outlet.
  • the cooling of the inner wall takes place by impingement cooling when the cooling fluid passes through the openings of the intermediate wall from the outer to the inner cooling chamber, whose wall facing the hot gas represents the inner wall to be cooled, and by convection cooling through the fluid flowing in the direction of the outlet.
  • a cooling fluid circuit is constructed by the multi-shell structure of the outer wall. Such a multi-shell combustion chamber housing construction is complicated.
  • the use of steam as the cooling fluid requires that the cooling steam already be generated at the start of the turbine and must be fed back into the process.
  • the invention has for its object to provide a heat shield assembly, which allows an economical operation of the system. As needed, economical operation may require primarily low coolant losses, low noise, high efficiency, or a simple and easy to assemble design.
  • a heat shield element in a heat shield arrangement of the type specified at the outset, is a single-shell hollow body which has a cooling air supply channel and at least one opening for discharging the cooling air into a tile interspace which is located between the individual heat shield elements.
  • a single-shell construction is structurally much simpler than the construction of already known multi-shell heat shield elements.
  • a closed cooling fluid guide is achieved in this arrangement in that the cooling air through the cooling air supply channel in the support structure in the interior of the hollow body flows, where, for example, by means of an impingement cooling plate, the hot gas facing surface of the hollow body is cooled. After flowing out of the cooling air into the tile interspace, the air collected there can be used for combustion.
  • a further minimization of the cooling air consumption can be achieved by finding expansion gaps between the heat shield elements in which sealing elements, preferably corrugated sheets, are seated.
  • the outflow of the cooling air from the hollow body through the at least one opening, in addition to the cooling of the lateral edges of the hollow body itself and the cooling of the adjacent heat shield element also ensures the cooling of the sealing element.
  • a heat shield element of the arrangement is anchored to the support structure under prestress.
  • Such anchoring ensures the position of the heat shield element against rotation, especially in the hot-cold transitions which frequently occur during operation and the associated expansion and contraction processes of the components of the arrangement involved.
  • the sealing elements sit in grooves of the heat shield elements, a game is left in the groove transverse direction.
  • adjacent heat shield elements can be displaced against one another in the direction of the sealing elements after release of the anchoring between the heat shield element and the supporting structure, ie in the transverse direction of the groove. It is possible to disassemble and remove a heat shield element from the hot gas side by releasing its anchorage with the support structure and that of the adjacent heat shield elements, pushing the adjacent heat shield elements away from the heat shield element to be removed by utilizing the aforementioned game and removing the heat shield element to be disassembled.
  • FIG. 1 shows a heat shield element 1, which is shown cut longitudinally in the middle.
  • the Switzerlandverschraubung advantageously consists of a central fastening bolt 3a, which has an external thread, one or more disc springs 3b and a nut 3c.
  • the Switzerlandverschraubung spans the heat shield element 1 against the support structure 2 and is held by means of one or more disc springs 3b train. By thus achieved bias the heat shield element 1 is secured in its position. Sealing elements 4 prevent the inflow of cooling air from the tile clearance 5 through the expansion gap 6 in the combustion chamber 7.
  • An opening 8 for the exit of the cooling air from the hollow body 1 in the tile space 5 is preferably realized by all around the side wall of the heat shield element attached partial openings.
  • these partial openings are provided near the hot gas side, so that the cooling of the lateral edges of the heat shield element itself, as well as the cooling of the sealing elements 4 and the cooling of the adjacent heat shield elements is ensured.
  • Such an arrangement of the opening 8 or partial openings also improves the cooling of the side edges of adjacent heat shield elements, which virtually no cooling air leaks have to be accepted.
  • Adjacent heatshield elements 1 separated by an expansion gap 6 may be grouted together in various ways (e.g., by a tongue and groove joint).
  • FIG. 2 shows a sealing element 4 between two adjacent heat shield elements.
  • the sealing element 4 is preferably designed as checker plate.
  • the sealing element 4 is seated in grooves 9 of the heat shield elements, leaving a game 10th
  • FIG. 3 shows the juxtaposed on a support structure 2 heat shield elements seen from the hot gas side.
  • the areas exposed to the hot gas surfaces of the heat shield elements are omitted in the drawing to allow a view into the interior of the hollow body.
  • the cooling air supply channel 11 is performed, for example, as four sub-channels.
  • An anchoring of a heat shield element with the support structure 2 can be produced for example by a guided through the opening 12 screw.
  • the arrows indicate the direction of displaceability of the heat shield elements after their anchoring to the support structure 2 has been solved. In doing so, the in FIG. 2 exploited game 10 shown for the displacement of the heat shield elements. After the anchoring of the four adjacent to a heat shield element 13 heat shield elements has been solved with the support structure, this heat shield element 13 can be dismantled from the hot gas side and removed. During maintenance, such accessibility of the heat shield elements from the hot gas side is advantageous.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

According to the invention, a hot gas chamber, for example a combustion chamber (7) of a gas turbine installation, is lined with thermal shield elements (1). A closed-circuit cooling system is provided by configuring the thermal shield element (1) as a hollow body into which cool air flows via a cool air supply channel. Once the cool air is discharged from the thermal shield element (1) through at least one opening (8), it is collected in a tiled intermediate space (5) and is then used for the combustion process.

Description

Die Erfindung betrifft eine Anordnung von Hitzeschildelementen für eine Heißgas führende Struktur, insbesondere ein metallisches Bauteil einer Gasturbinenanlage oder Brennkammer. Die Anordnung besteht aus einer Mehrzahl von Hitzeschildelementen, die flächendeckend nebeneinander auf einer Tragstruktur angeordnet und mit dieser verankert sind. Eine solche Anordnung ist beispielsweise aus der WO 98/13645 bekannt.The invention relates to an arrangement of heat shield elements for a hot gas leading structure, in particular a metallic component of a gas turbine plant or combustion chamber. The arrangement consists of a plurality of heat shield elements, which are arranged side by side on a supporting structure and anchored with this area. Such an arrangement is for example from the WO 98/13645 known.

Aufgrund der in Heißgasräumen herrschenden hohen Temperaturen besteht die Notwendigkeit, eine Tragstruktur, die heißem Gas ausgesetzt ist, zu schützen. Hierzu ist es beispielsweise möglich, den Heißgasraum mit Hitzeschildelementen auszukleiden, deren dem Heißgas zugewandte Fläche gekühlt wird.Due to the high temperatures prevailing in hot gas rooms, there is a need to protect a support structure exposed to hot gas. For this purpose, it is possible, for example, to line the hot gas space with heat shield elements whose surface facing the hot gas is cooled.

In DE-U-297 14 742.0 wird eine Hitzeschildkomponente mit Kühlfluidrückführung und Hitzeschildanordnung für eine Heißgas führende Komponente beschrieben. Die Hitzeschildkomponente besteht aus einer hohlen Anordnung mit einer äußeren Schale und einem kleinen, hohlen Einsatz. Zwischen dem Einsatz und der äußeren Schale liegt ein Zwischenraum vor, der mit dem Kühlfluid durchströmbar ist. Der Einsatz besitzt auf der Bodenseite Durchlassöffnungen für das Kühlfluid. Eine geschlossene Kühlfluidführung wird dadurch erreicht, daß das Kühlfluid durch Kanäle in der Tragstruktur in den Einsatz strömt, von dort durch Durchlassöffnungen in die äußere Schale strömt - die Kühlung erfolgt dabei durch Prallkühlung und Konvektionskühlung - und von dort durch separate Auslasskanäle in der Tragstruktur zurückströmt. Der mehrschalige Aufbau des Hitzeschildelements gewährleistet die geschlossene Kühlfluidführung. Ein derartiger mehrschaliger Aufbau jedoch ist sehr aufwändig.In DE-U-297 14 742.0 A description is given of a heat shield component with cooling fluid return and heat shield assembly for a hot gas leading component. The heat shield component consists of a hollow arrangement with an outer shell and a small, hollow insert. Between the insert and the outer shell there is a gap which can be flowed through by the cooling fluid. The insert has on the bottom side passage openings for the cooling fluid. A closed cooling fluid guide is achieved in that the cooling fluid flows through channels in the support structure into the insert, flows from there through passage openings into the outer shell - the cooling takes place by impingement cooling and convection cooling - and from there flows back through separate outlet channels in the support structure. The multi-shell construction of the heat shield element ensures the closed cooling fluid flow. However, such a multi-shell construction is very complicated.

In DE 197 51 299 C2 wird eine Brennkammer sowie ein Verfahren zur Dampfkühlung einer Brennkammer vorgeschlagen. Dabei besteht die Tragstruktur der Brennkammer aus Innen-, Zwischen- und Außenwand. Das Kühlfluid, insbesondere Kühldampf, strömt durch einen Einlass in einen Außenkühlraum, von dort aus durch Öffnungen in der Zwischenwand in einen Innenkühlraum und von dort zum Auslass. Die Kühlung der Innenwand erfolgt durch Prallkühlung beim Übertritt des Kühlfluids durch die Öffnungen der Zwischenwand vom Außen- in den Innenkühlraum, dessen dem Heißgas zugewandte Wand die zu kühlende Innenwand darstellt, und durch Konvektionskühlung durch das in Richtung Auslass strömende Fluid. Ein Kühlfluidkreislauf wird dabei durch den mehrschaligen Aufbau der Außenwand aufgebaut. Eine derartige mehrschalige Brennkammergehäusekonstruktion ist aufwändig. Außerdem erfordert die Verwendung von Dampf als Kühlfluid, dass der Kühldampf bereits beim Start der Turbine erzeugt sein und in den Prozess rückgespeist werden muss.In DE 197 51 299 C2 a combustion chamber and a method for steam cooling a combustion chamber is proposed. In this case, the support structure of the combustion chamber consists of inner, intermediate and outer wall. The cooling fluid, in particular cooling steam, flows through an inlet into an external cooling space, from there through openings in the intermediate wall into an internal cooling space and from there to the outlet. The cooling of the inner wall takes place by impingement cooling when the cooling fluid passes through the openings of the intermediate wall from the outer to the inner cooling chamber, whose wall facing the hot gas represents the inner wall to be cooled, and by convection cooling through the fluid flowing in the direction of the outlet. A cooling fluid circuit is constructed by the multi-shell structure of the outer wall. Such a multi-shell combustion chamber housing construction is complicated. In addition, the use of steam as the cooling fluid requires that the cooling steam already be generated at the start of the turbine and must be fed back into the process.

Der Erfindung liegt die Aufgabe zugrunde, eine Hitzeschildanordnung anzugeben, die einen ökonomischen Betrieb der Anlage ermöglicht. Je nach Bedarf kann ein ökonomischer Betrieb in erster Linie geringe Kühlmittelverluste, eine niedrige Geräuschentwicklung, einen hohen Wirkungsgrad oder eine einfache und montagefreundliche Konstruktion erfordern.The invention has for its object to provide a heat shield assembly, which allows an economical operation of the system. As needed, economical operation may require primarily low coolant losses, low noise, high efficiency, or a simple and easy to assemble design.

Erfindungsgemäß ist bei einer Hitzeschildanordnung der eingangs angegebenen Art ein Hitzeschildelement ein einschaliger Hohlkörper, der einen Kühlluftzufuhrkanal und mindestens eine Öffnung zum Austritt der Kühlluft in einen Kachelzwischenraum, der sich zwischen den einzelnen Hitzeschildelementen befindet, besitzt. Ein derartiger einschaliger Aufbau ist konstruktiv wesentlich einfacher als der Aufbau bereits bekannter mehrschaliger Hitzeschildelemente.According to the invention, in a heat shield arrangement of the type specified at the outset, a heat shield element is a single-shell hollow body which has a cooling air supply channel and at least one opening for discharging the cooling air into a tile interspace which is located between the individual heat shield elements. Such a single-shell construction is structurally much simpler than the construction of already known multi-shell heat shield elements.

Eine geschlossene Kühlfluidführung wird in dieser Anordnung dadurch erreicht, dass die Kühlluft durch den Kühlluftzufuhrkanal in der Tragstruktur in das Innere des Hohlkörpers strömt, wo beispielsweise mittels eines Prallkühlbleches die dem Heißgas zugewandte Fläche des Hohlkörpers gekühlt wird. Nach Ausströmen der Kühlluft in den Kachelzwischenraum kann die dort gesammelte Luft zur Verbrennung genutzt werden.A closed cooling fluid guide is achieved in this arrangement in that the cooling air through the cooling air supply channel in the support structure in the interior of the hollow body flows, where, for example, by means of an impingement cooling plate, the hot gas facing surface of the hollow body is cooled. After flowing out of the cooling air into the tile interspace, the air collected there can be used for combustion.

Eine weitere Minimierung des Kühlluftverbrauchs kann man dadurch erreichen, dass sich zwischen den Hitzeschildelementen Dehnungsspalten finden, in denen Dichtelemente, bevorzugt Riffelbleche, sitzen. Das Ausströmen der Kühlluft aus dem Hohlkörper durch die mindestens eine Öffnung stellt neben der Kühlung der seitlichen Kanten des Hohlkörpers selbst und der Kühlung des benachbarten Hitzeschildelements auch die Kühlung des Dichtelements sicher.A further minimization of the cooling air consumption can be achieved by finding expansion gaps between the heat shield elements in which sealing elements, preferably corrugated sheets, are seated. The outflow of the cooling air from the hollow body through the at least one opening, in addition to the cooling of the lateral edges of the hollow body itself and the cooling of the adjacent heat shield element also ensures the cooling of the sealing element.

Zweckmäßig wird ein Hitzeschildelement der Anordnung mit der Tragstruktur unter Vorspannung verankert. Eine derartige Verankerung sichert die Lage des Hitzeschildelements gegen Verdrehung, besonders bei den häufig im Betrieb auftretenden Heiß-Kalt-Übergängen und den damit verbundenen Ausdehnungs- und Kontraktionsvorgängen der beteiligten Komponenten der Anordnung.Suitably, a heat shield element of the arrangement is anchored to the support structure under prestress. Such anchoring ensures the position of the heat shield element against rotation, especially in the hot-cold transitions which frequently occur during operation and the associated expansion and contraction processes of the components of the arrangement involved.

Vorteilhaft sitzen die Dichtelemente in Nuten der Hitzeschildelemente, wobei ein Spiel in Nutenquerrichtung belassen wird. Dadurch können benachbarte Hitzeschildelemente nach Lösen der Verankerung zwischen Hitzeschildelement und Tragstruktur gegeneinander in Richtung der Dichtelemente - d.h. im Nutenquerrichtung - verschoben werden. Man kann ein Hitzeschildelement von der Heißgasseite aus demontieren und entnehmen, indem man seine Verankerung mit der Tragstruktur und diejenige der benachbarten Hitzeschildelemente löst, die benachbarten Hitzeschildelemente vom zu entnehmenden Hitzeschildelement unter Ausnutzung des vorher genannten Spiels wegschiebt und das zu demontierende Hitzeschildelement entnimmt.Advantageously, the sealing elements sit in grooves of the heat shield elements, a game is left in the groove transverse direction. As a result, adjacent heat shield elements can be displaced against one another in the direction of the sealing elements after release of the anchoring between the heat shield element and the supporting structure, ie in the transverse direction of the groove. It is possible to disassemble and remove a heat shield element from the hot gas side by releasing its anchorage with the support structure and that of the adjacent heat shield elements, pushing the adjacent heat shield elements away from the heat shield element to be removed by utilizing the aforementioned game and removing the heat shield element to be disassembled.

Im Folgenden wird ein Ausführungsbeispiel einer Hitzeschildanordnung angegeben. Dabei zeigen:

FIG 1
einen Längsschnitt durch die Mitte eines Hitzeschildelements mit Tragstruktur einschließlich der Verankerung des Hitzeschildelements mit der Tragstruktur,
FIG 2
einen Längsschnitt durch zwei benachbarte Hitzeschildelemente im Bereich des Dichtelements zwischen den Hitzeschildelementen, und
FIG 3
eine Draufsicht von der Heißgasseite aus auf mehrere nebeneinander angeordnete Hitzeschildelemente.
In the following an embodiment of a heat shield assembly is given. Showing:
FIG. 1
a longitudinal section through the center of a heat shield element with support structure including the anchoring of the heat shield element with the support structure,
FIG. 2
a longitudinal section through two adjacent heat shield elements in the region of the sealing element between the heat shield elements, and
FIG. 3
a plan view of the hot gas side on a plurality of juxtaposed heat shield elements.

FIG 1 zeigt ein Hitzeschildelement 1, das in der Mitte längs aufgeschnitten dargestellt ist. Die Verankerung des Hitzeschildelements 1 mit der Tragstruktur 2 erfolgt beispielsweise durch eine Zugverschraubung. Die Zugverschraubung besteht vorteilhaft aus einem zentralen Befestigungsbolzen 3a, der ein Außengewinde besitzt, einer oder mehreren Tellerfedern 3b sowie einer Mutter 3c. Die Zugverschraubung spannt das Hitzeschildelement 1 gegen die Tragstruktur 2 vor und wird mittels einer oder mehrerer Tellerfedern 3b auf Zug gehalten. Durch die so erreichte Vorspannung wird das Hitzeschildelement 1 in seiner Lage gesichert. Dichtelemente 4 verhindern das Einströmen von Kühlluft aus dem Kachelzwischenraum 5 durch den Dehnungsspalt 6 in die Brennkammer 7. Eine Öffnung 8 zum Austritt der Kühlluft aus dem Hohlkörper 1 in den Kachelzwischenraum 5 wird vorzugsweise durch ringsum an der Seitenwand des Hitzeschildelements angebrachte Teilöffnungen realisiert. Vorteilhaft werden diese Teilöffnungen nahe der Heißgasseite angebracht, so dass die Kühlung der seitlichen Ränder des Hitzeschildelements selbst, sowie die Kühlung der Dichtelemente 4 und die Kühlung der benachbarten Hitzeschildelemente sichergestellt wird. Eine derartige Anordnung der Öffnung 8 bzw. Teilöffnungen verbessert außerdem die Kühlung der Seitenränder benachbarter Hitzeschildelemente, wobei hierfür praktisch keine Kühlluftleckagen hingenommen werden müssen. FIG. 1 shows a heat shield element 1, which is shown cut longitudinally in the middle. The anchoring of the heat shield element 1 with the support structure 2, for example, by a Zugverschraubung. The Zugverschraubung advantageously consists of a central fastening bolt 3a, which has an external thread, one or more disc springs 3b and a nut 3c. The Zugverschraubung spans the heat shield element 1 against the support structure 2 and is held by means of one or more disc springs 3b train. By thus achieved bias the heat shield element 1 is secured in its position. Sealing elements 4 prevent the inflow of cooling air from the tile clearance 5 through the expansion gap 6 in the combustion chamber 7. An opening 8 for the exit of the cooling air from the hollow body 1 in the tile space 5 is preferably realized by all around the side wall of the heat shield element attached partial openings. Advantageously, these partial openings are provided near the hot gas side, so that the cooling of the lateral edges of the heat shield element itself, as well as the cooling of the sealing elements 4 and the cooling of the adjacent heat shield elements is ensured. Such an arrangement of the opening 8 or partial openings also improves the cooling of the side edges of adjacent heat shield elements, which virtually no cooling air leaks have to be accepted.

Nebeneinander liegende, von einem Dehnungsspalt 6 getrennte Hitzeschildelemente 1 können auf verschiedene Weise (z.B. mittels einer Nut- und Feder-Verbindung) miteinander verfugt sein.Adjacent heatshield elements 1 separated by an expansion gap 6 may be grouted together in various ways (e.g., by a tongue and groove joint).

FIG 2 zeigt ein Dichtelement 4 zwischen zwei benachbarten Hitzeschildelementen. Das Dichtelement 4 wird vorzugsweise als Riffelblech ausgeführt. Das Dichtelement 4 sitzt in Nuten 9 der Hitzeschildelemente unter Belassung eines Spiels 10. FIG. 2 shows a sealing element 4 between two adjacent heat shield elements. The sealing element 4 is preferably designed as checker plate. The sealing element 4 is seated in grooves 9 of the heat shield elements, leaving a game 10th

FIG 3 zeigt die nebeneinander auf einer Tragstruktur 2 angeordneten Hitzeschildelemente von der Heißgasseite aus gesehen. Die dem Heißgas ausgesetzten Flächen der Hitzeschildelemente sind in der Zeichnung weggelassen, um einen Blick in das Innere der Hohlkörper zu ermöglichen. FIG. 3 shows the juxtaposed on a support structure 2 heat shield elements seen from the hot gas side. The areas exposed to the hot gas surfaces of the heat shield elements are omitted in the drawing to allow a view into the interior of the hollow body.

Der Kühlluftzufuhrkanal 11 wird beispielsweise als vier Teilkanäle ausgeführt. Eine Verankerung eines Hitzeschildelements mit der Tragstruktur 2 kann beispielsweise durch eine durch die Öffnung 12 hindurchgeführte Schraubverbindung hergestellt werden.The cooling air supply channel 11 is performed, for example, as four sub-channels. An anchoring of a heat shield element with the support structure 2 can be produced for example by a guided through the opening 12 screw.

Die Pfeile deuten die Richtung der Verschiebbarkeit der Hitzeschildelemente an, nachdem deren Verankerung mit der Tragstruktur 2 gelöst wurde. Dabei wird das in FIG 2 gezeigte Spiel 10 für die Verschiebung der Hitzeschildelemente ausgenutzt. Nachdem die Verankerung der vier zu einem Hitzeschildelement 13 benachbarten Hitzeschildelemente mit der Tragstruktur gelöst wurde, kann dieses Hitzeschildelement 13 von der Heißgasseite aus demontiert und entnommen werden. Bei Wartungsarbeiten ist eine derartige Zugänglichkeit der Hitzeschildelemente von der Heißgasseite aus vorteilhaft.The arrows indicate the direction of displaceability of the heat shield elements after their anchoring to the support structure 2 has been solved. In doing so, the in FIG. 2 exploited game 10 shown for the displacement of the heat shield elements. After the anchoring of the four adjacent to a heat shield element 13 heat shield elements has been solved with the support structure, this heat shield element 13 can be dismantled from the hot gas side and removed. During maintenance, such accessibility of the heat shield elements from the hot gas side is advantageous.

Claims (5)

  1. A thermal shield arrangement having a closed-circuit cooling-air system for a structure carrying hot gas, especially a metallic component of a gas turbine plant or combustion chamber, having thermal shield elements (1) anchored next to one another on a supporting structure (2) in such a way as to cover the surface, characterized in that the thermal shield elements (1) are single-shell hollow bodies and have a cooling-air feed passage and at least one opening for the discharge of the cooling air into a tiled intermediate space (5) which is located between the individual thermal shield elements (1), and in that there are expansion gaps (6) between the thermal shield elements (1), sealing elements (4), preferably checker metal sheets, being arranged in the expansion gaps (6), these sealing elements (4) being cooled by the cooling air.
  2. Thermal shield arrangement according to Claim 1, characterized in that the thermal shield elements (1) are anchored under prestress to the supporting structure (2).
  3. Thermal shield arrangement according to Claim 2, characterized in that the sealing elements (4) sit in slots (9) of the thermal shield elements (1) while leaving a clearance (10) in the transverse direction of the slot.
  4. Thermal shield arrangement according to Claim 3, characterized in that the sealing elements (4) are configured in such a way that, after the anchoring between a first thermal shield element (1) and the supporting structure (2) has been released, adjacent thermal shield elements are displaceable relative to one another in the direction of the sealing elements in such a way that the first thermal shield element can be removed from the hot gas side.
  5. Thermal shield arrangement according to one of Claims 1 to 4, characterized in that the opening 8 for the discharge of the cooling air from the thermal shield element (1) consists in sectional openings (9) arranged in an encircling manner on the hot-gas-side lateral margin of the thermal shield element (1).
EP01914999A 2000-01-28 2001-01-25 Thermal shield for a component carrying hot gases, especially for structural components of gas turbines Expired - Lifetime EP1250555B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10003728 2000-01-28
DE10003728A DE10003728A1 (en) 2000-01-28 2000-01-28 Heat shield arrangement for a component carrying hot gas, in particular for structural parts of gas turbines
PCT/DE2001/000300 WO2001055273A2 (en) 2000-01-28 2001-01-25 Thermal shield for a component carrying hot gases, especially for structural components of gas turbines

Publications (2)

Publication Number Publication Date
EP1250555A2 EP1250555A2 (en) 2002-10-23
EP1250555B1 true EP1250555B1 (en) 2008-11-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01914999A Expired - Lifetime EP1250555B1 (en) 2000-01-28 2001-01-25 Thermal shield for a component carrying hot gases, especially for structural components of gas turbines

Country Status (6)

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US (1) US6786048B2 (en)
EP (1) EP1250555B1 (en)
JP (1) JP2003524733A (en)
CN (1) CN1311195C (en)
DE (2) DE10003728A1 (en)
WO (1) WO2001055273A2 (en)

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Also Published As

Publication number Publication date
JP2003524733A (en) 2003-08-19
WO2001055273A2 (en) 2001-08-02
DE50114520D1 (en) 2009-01-08
US6786048B2 (en) 2004-09-07
WO2001055273A3 (en) 2002-02-07
EP1250555A2 (en) 2002-10-23
CN1395667A (en) 2003-02-05
CN1311195C (en) 2007-04-18
DE10003728A1 (en) 2001-08-09
US20030021675A1 (en) 2003-01-30

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