EP1678454A2 - Tuile refractaire avec des elements de renforcement noyes pour revetement d'une chambre de combustion de turbines a gaz - Google Patents

Tuile refractaire avec des elements de renforcement noyes pour revetement d'une chambre de combustion de turbines a gaz

Info

Publication number
EP1678454A2
EP1678454A2 EP04790917A EP04790917A EP1678454A2 EP 1678454 A2 EP1678454 A2 EP 1678454A2 EP 04790917 A EP04790917 A EP 04790917A EP 04790917 A EP04790917 A EP 04790917A EP 1678454 A2 EP1678454 A2 EP 1678454A2
Authority
EP
European Patent Office
Prior art keywords
heat shield
combustion chamber
shield element
reinforcing
elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04790917A
Other languages
German (de)
English (en)
Inventor
Holger Grote
Wolfgang Kollenberg
Marc Tertilt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP04790917A priority Critical patent/EP1678454A2/fr
Publication of EP1678454A2 publication Critical patent/EP1678454A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0033—Linings or walls comprising heat shields, e.g. heat shieldsd
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/04—Blast furnaces with special refractories
    • C21B7/06—Linings for furnaces
    • 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
    • F23R3/007—Continuous combustion chambers using liquid or gaseous fuel constructed mainly of ceramic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F27D1/06—Composite bricks or blocks, e.g. panels, modules
    • F27D1/08—Bricks or blocks with internal reinforcement or metal backing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/10—Monolithic linings; Supports therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • Y10T428/2942—Plural coatings
    • Y10T428/2949—Glass, ceramic or metal oxide in coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2973—Particular cross section

Definitions

  • Heat shield element in particular for lining a combustion chamber wall
  • the invention relates to a heat shield element, in particular for the inner lining of a combustion chamber or a furnace.
  • the invention further relates to a combustion chamber with an inner lining formed from heat shield elements and a gas turbine with a combustion chamber.
  • a thermally and / or thermomechanically highly loaded combustion chamber such as a furnace, a hot gas duct or a combustion chamber in a gas turbine, in which a hot medium is generated and / or guided, is provided with an appropriate lining to protect it from excessive thermal stress.
  • the lining usually consists of heat-resistant material and protects a wall of the combustion chamber from direct contact with the hot medium and the associated strong thermal stress.
  • US Pat. No. 4,840,131 relates to an attachment of ceramic lining elements to a wall of an oven.
  • a rail system that is attached to the wall.
  • the lining elements have a rectangular shape with a planar surface and consist of a heat-insulating, refractory, ceramic fiber material.
  • US Pat. No. 4,835,831 also deals with the application of a refractory lining from a wall of one
  • Oven in particular a vertically arranged wall.
  • a layer consisting of glass, ceramic or mineral fibers is applied to the metallic wall of the furnace. This layer is attached to the wall with metal clips or glue.
  • a wire mesh with honeycomb-shaped meshes is applied to this layer.
  • the mesh network also serves to secure the layer of ceramic fibers against a falling down.
  • a uniform, closed surface made of refractory material is attached using a bolt. The described method largely avoids that refractory particles striking during the spraying are thrown back, as would be the case if the refractory particles were sprayed directly onto the metallic wall.
  • a ceramic lining of the walls of thermally highly stressed combustion chambers is described in EP 0 724 116 A2.
  • the lining consists of wall elements made of high-temperature-resistant structural ceramics, such as. B. silicon carbide (SiC) or silicon nitride (Si 3 N 4 ).
  • the wall elements are mechanically and resiliently fastened to a metal support structure (wall) of the combustion chamber by means of a central fastening bolt.
  • a thick thermal insulation layer is provided between the wall element and the wall of the combustion chamber, so that the wall element is appropriately spaced from the wall of the combustion chamber.
  • the insulation layer which is about three times as thick as the wall element, consists of ceramic fiber material that is prefabricated in blocks. The dimensions and the external shape of the wall elements can be adapted to the geometry of the room to be lined.
  • the lining consists of heat shield elements, which are mechanically held on a metallic wall of the combustion chamber.
  • the heat shield duck directly touch the metallic wall.
  • the space formed by the wall of the combustion chamber and the heat shield element is acted upon by cooling or sealing air.
  • the sealing air prevents the penetration of hot medium to the wall and simultaneously cools the wall and the heat shield element.
  • WO 99/47874 relates to a wall segment for a combustion chamber and a combustion chamber of a gas turbine.
  • a wall segment for a combustion chamber which with a hot fluid, for. B. a hot gas can be acted upon, with a metallic support structure and a heat shield element fastened to the metallic support structure.
  • a deformable separating layer is inserted between the metallic support structure and the heat shield element, which is intended to absorb and compensate for possible relative movements of the heat shield element and the support structure.
  • Such relative movements can be caused, for example, in the combustion chamber of a gas turbine, in particular an annular combustion chamber, by different thermal expansion behavior of the materials used and by pulsations in the combustion chamber, which can occur in the event of irregular combustion to generate the hot working medium.
  • the separating layer causes the relatively inelastic heat shield element to lie flat on the separating layer and the metallic support structure, since the heat shield element partially penetrates into the separating layer.
  • the separating layer can compensate for unevenness in the support structure and / or the heat shield element, which may lead to an unfavorable selective force input locally.
  • the wall to be protected against hot gas attack is lined with a large number of individual ceramic heat shields, for example heat shield elements made of a technical ceramic, which are limited in size.
  • individual ceramic heat shield elements which, for safety reasons, must never be completely closed, even when hot, by design. It must be ensured that the hot gas does not about the expansion gaps heats the bearing wall structure excessively.
  • the easiest and safest way to avoid this in a gas turbine combustion chamber is to purge the expansion gaps with air, so-called sealing air cooling.
  • the air can be used, which is required anyway for cooling mounting elements for the ceramic heat shields.
  • the invention has for its object to provide a heat shield element which have a particularly long life with high strength. Furthermore, a particularly low-maintenance combustion chamber and a gas turbine with such a combustion chamber are to be specified.
  • this object is achieved according to the invention with a base body formed from a solidified cast ceramic material, into which a number of reinforcing elements are introduced.
  • the invention is based on the consideration that a heat shield element designed for a particularly long service life ent should be particularly adapted to the extreme operating conditions.
  • a heat shield element designed for a particularly long service life ent should be particularly adapted to the extreme operating conditions.
  • production by casting is now provided, with a departure from the previously customary production of the heat shield elements by pressing.
  • the service life of the heat shield element could be limited due to a comparatively low tensile strength, particularly in the longitudinal and transverse directions of the heat shield element.
  • reinforcing elements are therefore provided which are integrated in the base body of the heat shield element. These reinforcing elements should be firmly connected to the heat shield element in order to transfer the material property of the tensile strength of the reinforcing elements to the heat shield element. This function is fulfilled by the reinforcement elements positioned within the heat shield elements, which are cast into the base body by the ceramic casting material and are thereby firmly connected to the base body or to the ceramic.
  • the constructive degrees of freedom associated with the use of a casting technique in the design of the heat shield elements are used in particular to achieve a particularly high load through suitable geometries or local variations of characteristic material parameters. Ensure resilience even with changing thermal loads on the heat shield element.
  • the respective reinforcing element is advantageously formed from a ceramic material, preferably from an oxide-ceramic material with an Al 2 0 3 portion of at least 60 wt .-% and with an Si0 2 portion of at most 20 wt .-%.
  • a ceramic material preferably from an oxide-ceramic material with an Al 2 0 3 portion of at least 60 wt .-% and with an Si0 2 portion of at most 20 wt .-%.
  • This has a comparatively high tensile strength and, due to the similar ceramic materials, bonds firmly to the ceramic casting material during consolidation.
  • the thermal expansion of the reinforcing material is similar to the rest of the ceramic material of the heat shield element, so that there are no unfavorable stresses in the heat shield element when the temperature changes.
  • the reinforcing element can expediently consist of ceramic fibers such as CMC materials or of structural ceramic
  • the respective reinforcing element is preferably designed in the manner of a long, round ceramic rod in the manner of a reinforcement.
  • a reinforcing element particularly firmly into a heat shield element and to design the reinforcing element as stiff as possible, it expediently has a number of beads and thickenings.
  • the reinforcing element is anchored in the surrounding ceramic material by means of which the tensile strength of the reinforcing element is transferred to the entire heat shield element.
  • the reinforcing element can have thickenings, in particular at its end regions, so that a bone shape results. Such thickened ends or rib-like thickenings create a positive connection between Reinforcing element and base body ensured. Alternatively or additionally, this connection can also be non-positively, for example via a sintering process or a grain.
  • a reinforcement element can also expediently be designed in the form of a plate, in particular a flat plate arranged parallel and spaced apart from the surface of the heat shield element.
  • a plate can be positioned on the side facing the working medium, while a plate for reinforcement is also assigned to the cooler side of the heat shield element.
  • such a plate advantageously has a number of cutouts.
  • the ceramic casting compound can get into the recesses and also solidify there.
  • the plate can in particular be designed as a perforated plate, the number, size and positioning of the holes being appropriately selected as a function of the input purpose and material parameters.
  • a reinforcing element of a heat shield element preferably has a lattice structure.
  • the grid elements can form a grid structured with diamond-shaped or square cutouts.
  • a reinforcing element can also be formed by a plate which has circular recesses which are positioned at equal distances from one another, so that a lattice-shaped structure is produced.
  • a reinforcement element is expediently designed in the form of a rod and positioned along a peripheral edge of the heat shield element.
  • a reinforcing element preferably has an annular closed shape and runs along the circumference of the heat shield element.
  • a reinforcement element is expediently designed as a circular ring.
  • a reinforcing element advantageously has a cruciform shape, the ends being positioned in the region of the corners of the heat shield element.
  • the ends of the cross-shaped reinforcement element can be thickened, so that the reinforcement element is anchored in the heat shield element.
  • Heat shield elements of the type described above are expediently components of the inner lining of a combustion chamber.
  • This combustion chamber is advantageously part of a gas turbine.
  • the combustion chamber could be designed as a silo-shaped combustion chamber or as a combustion chamber composed of several smaller combustion systems, but is preferably designed as an annular combustion chamber.
  • the advantages achieved with the invention are, in particular, the possibility of using a casting method to produce heat shield elements with the resulting degree of freedom in design, which have a particularly high tensile strength.
  • the integration of reinforcement elements in heat shield elements which consist of a cast ceramic material, makes it possible to transfer the material properties of the reinforcement elements, in particular the tensile strength, to a heat shield element.
  • the shape of a heat shield element can be kept flexible.
  • Another advantage is that the choice of different embodiments of reinforcing elements and the positioning of these in the heat shield element enables individual adaptation to the thermal and mechanical loads acting on a heat shield element. Due to the increased strength of the heat shield elements, the service life of a heat shield element is also extended, since the spread of cracks is reduced and the structural integrity of the component (passive safety) is increased.
  • the advantage of a casting process is the ability to make more complex shapes of heat shield elements.
  • the outer basic shape can be varied comparatively easily and inexpensively.
  • FIG. 1 shows a half section through a gas turbine
  • FIG. 2 shows the combustion chamber of the gas turbine according to FIG. 1
  • 3 shows a heat shield element with plate-shaped reinforcing elements
  • FIG. 7 shows a heat shield element with a cross-shaped reinforcing element.
  • the gas turbine 1 has a compressor 2 for combustion air, a combustion chamber 4 and a turbine 6 for driving the compressor 2 and a generator or a working machine (not shown).
  • the turbine 6 and the compressor 2 are arranged on a common turbine shaft 8, also referred to as a turbine rotor, to which the generator or the working machine is also connected, and which is rotatably mounted about its central axis 9.
  • the combustion chamber 4, which is designed as an annular combustion chamber, is equipped with a number of burners 10 for the combustion of a liquid or gaseous fuel.
  • the turbine 6 has a number of rotatable rotor blades 12 connected to the turbine shaft 8.
  • the blades 12 are arranged in a ring shape on the turbine shaft 8 and thus form a number of rows of blades.
  • the turbine 6 comprises a number of stationary guide vanes 14, which are also ring-shaped, with the formation of rows of guide vanes, on an inner housing 16 of the turbine 6. are consolidated.
  • the blades 12 serve to drive the turbine shaft 8 by means of impulse transmission from the working medium M flowing through the turbine 6.
  • the guide blades 14, serve to guide the flow of the working medium M between two successive rows of blades or rotor blades as seen in the flow direction of the working medium M.
  • a successive pair of a ring of guide blades 14 or a row of guide blades and a ring of rotor blades 12 or a row of rotor blades is also referred to as a turbine stage.
  • Each guide vane 14 has a platform 18, also referred to as a blade root, which is arranged as a wall element for fixing the respective guide vane 14 to the inner housing 16 of the turbine 6.
  • the platform 18 is a thermally comparatively heavily loaded component, which forms the outer boundary of a heating gas channel for the working medium M flowing through the turbine 6.
  • Each rotor blade 12 is fastened in an analogous manner to the turbine shaft 8 via a platform 20 which is also referred to as a blade root.
  • each guide ring 21 is arranged on the inner casing 16 of the turbine 6.
  • the outer surface of each guide ring 21 is likewise exposed to the hot working medium M flowing through the turbine 6 and is spaced in the radial direction from the outer end 22 of the rotor blade 12 lying opposite it by a gap.
  • the guide rings 21 arranged between adjacent rows of guide vanes serve in particular as cover elements which protect the inner wall 16 or other housing built-in parts against thermal overloading by the hot working medium M flowing through the turbine 6.
  • the combustion chamber 4 is designed as a so-called annular combustion chamber, in which a plurality of burners 10 arranged in the circumferential direction around the turbine shaft 8 open into a common combustion chamber space.
  • the combustion chamber 4 is configured in its entirety as an annular structure which is positioned around the turbine shaft 8.
  • the combustion chamber 4 is designed for a comparatively high temperature of the working medium M of approximately 1200 ° C. to 1500 ° C.
  • the combustion chamber wall 24 is provided on its side facing the working medium M with an inner lining formed from heat shield elements 26. Due to the high temperatures inside the combustion chamber 4, a cooling system is provided for the heat shield elements 26.
  • the heat shield elements 26 are designed in particular for a long service life, so that as little damage as possible due to the extreme influences, such as the high temperature and vibrations of the combustion chamber 4, occur.
  • these consist of a base body 28 formed from a cast ceramic material, in which reinforcing elements 30 are integrated.
  • reinforcing elements 30 are integrated.
  • the reinforcement elements 30 can be designed for the influences acting on a heat shield element 26.
  • FIGS. 3 to 7 show various embodiments of heat shield elements 26 with reinforcing elements 30.
  • FIG. 3 shows a heat shield element 26 with plate-shaped reinforcement elements 30, a reinforcement element 30 being provided for the surface facing the working medium M and for the surface facing the cooled side.
  • 4 shows that the plate-shaped reinforcing elements 30 for a better bond with the surrounding core.
  • Ceramic can be provided with a grid-shaped structure or are designed as a grid, in particular as a cross grid (FIG 4a) or as a perforated grid (FIG 4b).
  • rod-shaped reinforcement elements 30 can be used, which run along the side edges of a heat shield element 26 and with beads or thickenings (FIG. 5a) or compressed ends (FIG. 5b) are provided to ensure firm anchoring in the surrounding ceramic 28.
  • annular structure (FIG. 6a) of the reinforcing elements 30 can be used for reinforcing a heat shield element 26 along its circumference, it being possible for this to be circular in a particularly torsionally rigid design (FIG. 6b).
  • a cross-shaped reinforcing element 30 is provided for a stabilizing bracing of the corners of a heat shield element 26, each of which has thickenings at its ends for anchoring in the ceramic material 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

Un élément d'écran thermique (26) destiné à la garniture intérieure de la chambre de combustion (4) d'une turbine à gaz (1) doit présenter, tout en ayant une résistance élevée, une durée de vie aussi longue que possible. A cet effet, l'élément d'écran thermique (26) est caractérisé en ce qu'il présente un corps de base (28) en un matériau céramique moulé, renforcé, dans lequel est incorporé une pluralité d'éléments de renforcement (30).
EP04790917A 2003-10-27 2004-10-27 Tuile refractaire avec des elements de renforcement noyes pour revetement d'une chambre de combustion de turbines a gaz Withdrawn EP1678454A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04790917A EP1678454A2 (fr) 2003-10-27 2004-10-27 Tuile refractaire avec des elements de renforcement noyes pour revetement d'une chambre de combustion de turbines a gaz

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03024560A EP1528343A1 (fr) 2003-10-27 2003-10-27 Tuile réfractaire avec des éléments de renforcement noyés pour révêtement d'une chambre de combustion de turbines à gaz
EP04790917A EP1678454A2 (fr) 2003-10-27 2004-10-27 Tuile refractaire avec des elements de renforcement noyes pour revetement d'une chambre de combustion de turbines a gaz
PCT/EP2004/012142 WO2005043058A2 (fr) 2003-10-27 2004-10-27 Element d'ecran thermique destine notamment a la garniture d'une paroi d'une chambre de combustion

Publications (1)

Publication Number Publication Date
EP1678454A2 true EP1678454A2 (fr) 2006-07-12

Family

ID=34400464

Family Applications (2)

Application Number Title Priority Date Filing Date
EP03024560A Withdrawn EP1528343A1 (fr) 2003-10-27 2003-10-27 Tuile réfractaire avec des éléments de renforcement noyés pour révêtement d'une chambre de combustion de turbines à gaz
EP04790917A Withdrawn EP1678454A2 (fr) 2003-10-27 2004-10-27 Tuile refractaire avec des elements de renforcement noyes pour revetement d'une chambre de combustion de turbines a gaz

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP03024560A Withdrawn EP1528343A1 (fr) 2003-10-27 2003-10-27 Tuile réfractaire avec des éléments de renforcement noyés pour révêtement d'une chambre de combustion de turbines à gaz

Country Status (5)

Country Link
US (3) US7805945B2 (fr)
EP (2) EP1528343A1 (fr)
JP (1) JP4499737B2 (fr)
CN (1) CN1871488A (fr)
WO (1) WO2005043058A2 (fr)

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JP2007510121A (ja) 2007-04-19
US7805945B2 (en) 2010-10-05
CN1871488A (zh) 2006-11-29
EP1528343A1 (fr) 2005-05-04
US20100186365A1 (en) 2010-07-29
US8857190B2 (en) 2014-10-14
JP4499737B2 (ja) 2010-07-07
WO2005043058A3 (fr) 2005-08-11
WO2005043058A2 (fr) 2005-05-12
US20070028592A1 (en) 2007-02-08
US7540710B2 (en) 2009-06-02

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