EP2463583A1 - Gas turbine and method for reconditioning such a gas turbine - Google Patents
Gas turbine and method for reconditioning such a gas turbine Download PDFInfo
- Publication number
- EP2463583A1 EP2463583A1 EP11190982A EP11190982A EP2463583A1 EP 2463583 A1 EP2463583 A1 EP 2463583A1 EP 11190982 A EP11190982 A EP 11190982A EP 11190982 A EP11190982 A EP 11190982A EP 2463583 A1 EP2463583 A1 EP 2463583A1
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- EP
- European Patent Office
- Prior art keywords
- gas turbine
- cooling plate
- plate
- outer sealing
- segments
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- 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.)
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Classifications
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- 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
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/283—Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances
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- 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
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- 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
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- 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
- F23R2900/00012—Details of sealing devices
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- 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
- F23R2900/00019—Repairing or maintaining combustion chamber liners or subparts
Definitions
- the present invention relates to the field of gas turbines. It relates to a gas turbine according to the preamble of claim 1. It further relates to a method for reconditioning such a gas turbine.
- Fig. 13 shows in a highly simplified representation of a stationary gas turbine with sequential combustion, as known from the prior art.
- the illustrated gas turbine 10 includes a compressor 11 for compressing aspirated air, a first annular combustor 14 into which is mixed fuel injected with pre-mix type burners 13 supplied via a fuel supply 12. The resulting hot gas drives a first Turbine 15, and is then reheated by injecting a fuel from a second fuel supply 16 into a second combustion chamber 17, to then drive a second turbine 18.
- Modern stationary gas turbines are usually designed with an annular combustion chamber, as in Fig. 1 is reproduced.
- the local gas turbine 20 with annular combustion chamber 24 of the combustion chamber is limited by an outer side wall 25 and by an inner side wall 26.
- the hot gas path 27 is divided in the combustion chamber 24 by an inlet and an exit plane.
- the entry level is characterized by a plurality of burners 21, 22 and one or more front segments 23.
- the burners 21, 22 are positioned in the front segments and sealed in the flow direction.
- the attachment of the front segments themselves as well as their sealing must meet the requirements of the combustion.
- the combustion chamber 24 is operated for a long time, with or without interruptions (start and stop cycles). Examples of arrangements of front panels and front segments are from WO 96/04510 A1 or the DE 44 32 558 A1 known.
- This module is then delivered as a "front panel complete" to the installation site.
- the gas turbine according to the invention which is in particular a stationary gas turbine, comprises an annular combustion chamber which is bounded in the radial direction by an inner side wall and an outer side wall and in the axial direction by an annular front plate through which front plate burners communicate with the combustion chamber wherein the front plate is covered to the combustion chamber towards protection against heat by a plurality of circular ring forming, flat front segments, each comprising a front plate forming the front and a parallel to and spaced behind the front plate cooling plate.
- front segments are releasably hooked to the front panel, that for sealing the front segments in
- Circumferentially one another between adjacent front segments each extending in the radial direction seal is arranged, and that the seal by two parallel running, in the middle between the adjacent front segments abutting outer sealing strip is formed, each of which on the outside at the edge of the cooling plate the associated front segment is attached.
- An embodiment of the gas turbine according to the invention is characterized in that the front segments have on their back a plurality of hooks, and that on the front of the front plate fixing bolts are arranged, each having a hook receptacle, and in which the front segments are hooked with their hooks ,
- the hooks are arranged distributed on the edges of the front segments running in the radial direction, and if the hooks and the hook receivers are oriented such that the front segments are largely fixed perpendicular to the segment surface, while they have sufficient freedom of movement parallel to the segment surface Compensation of thermally induced strains.
- the fastening bolts are screwed to the front panel, means being provided for securing the fastening bolts against rotation.
- a further embodiment is characterized in that the cooling plate has holes distributed over the surface through which cooling air can flow into the intermediate space between the front plate and the cooling plate for impingement cooling of the front plate.
- Another embodiment of the invention is characterized in that in the front segments in each case the cooling plate is held by distributed in the area arranged spacer bolts at a distance from the front plate, and that the Fuse plate is fixed to the standoff bolt by means of the back of the standoff pins and fixed to the standoffs by a weld firmly connected washers.
- the lock washers are each composed of a lower ring and an upper ring, and when the lock washers are firmly connected only in the region of the upper ring with the associated standoff bolt through the weld.
- a further embodiment is characterized in that the outer sealing strips consist of a precipitation-hardened, high-temperature-resistant nickel-based alloy, that the outer sealing strips are biased to one another in the cold state of the gas turbine, that the outer sealing strips extend with their sealing lips against the flow direction, and that the outer sealing lips To reduce the mutual wear at their free ends are provided with a radius.
- Another embodiment of the invention is characterized in that for securing the outer sealing strips distributed along the edge of the cooling plate arranged fixing clips are provided, that the outer sealing strips are slidably held between the fixing clips and the respective heat sink, and that the fixing Clips are each outside the range of the outer sealing strip firmly connected by a weld with the heat sink
- the displacement of the outer sealing strip between the fixing clips and the associated cooling plate is limited in each case by a knob formed on the fixing clip, which penetrates through a larger cutout in the outer sealing strip into a pocket arranged underneath in the cooling plate.
- the inventive method for reconditioning a gas turbine according to the invention is characterized in that for removing the cooling plate, the welded with the standoffs upper rings are separated, that the remaining lower rings are deducted from the standoffs, and that for re-fixing the cooling plate on the standoffs The remaining lower rings are put back on the distance bolts and firmly connected to the distance bolts by welding.
- FIGS. 2 and 3 show in a view obliquely from the front or from behind a front segment 23 according to an embodiment of the invention.
- the front segment 23 has on the front side (towards the combustion chamber) a front plate 28 provided with distributed first holes 33.
- On the back of a cooling plate 29 is arranged parallel to the front plate 28, which is equipped with second holes 34.
- On the front panel 28, an upper edge 36 and a lower edge 37 are integrally formed at the top and bottom to the rear protruding.
- Also formed on the front plate 28 to the rear protruding are on the sides a plurality of along the side edges distributed hooks 35, the attachment of the front segment 23 on the front panel (45 in Fig. 5 ) serve.
- in the Front segment 23 are furthermore circular openings 31 and 32 for the burners 21 and 22 (FIG. Fig. 1 ) intended.
- the attachment of the front segments 23 on the front plate 45 is carried out according to 4 and 5 respectively.
- Fig. 9 by means of fastening bolts 39.
- the fastening bolts 39 have two mounting features: on the one hand, a securing pin 43, which is inserted into a securing bore 42 in the fastening bolt and in the front plate 45 in order to prevent the fastening bolt 39 from rotating ( Fig. 5 ).
- an Allen screw 44 which guided through the front panel 45 via a threaded hole 41, the fastening bolts 39 attached. This Allen screw 44 is finally protected against sweat.
- the fastening principle of the front segment 23 by means of the fastening bolts 39 is based on clamping, i. the hook receptacle 40 of the fastening bolt 39 clamps on the bearing surface of the hook 35 of the front segment 23 in the axial direction (perpendicular to the segment surface) the front segment 23 fixed.
- This principle still allows a displacement of the front segment in the radial and in the circumferential direction (in the plane of the segment surface) even with a large force. This mobility is necessary to compensate for the different thermal expansions of different components.
- spacers 46 include to maintain the desired distance to each other, and on the other hand have lock washers 47, which are welded to the standoffs 46 (weld 48) and thus the so-called sandwich construction of front panel 28 and heat sink 29 together.
- the standoffs 46 are connected to the front panel 28 by spot welding.
- the spacer bolts 46 can absorb forces in the radial and in the circumferential direction. These forces can arise due to the greater thermal expansion of the front plate relative to the heat sink.
- the lock washers 47 absorb all the axial forces, which are caused by pulsations of the combustion chamber 24 and thermal deformation of the front segment.
- the lock washers 47 are designed in two stages (47a, 47b in Fig. 7 ) so that they can be reused a second time during reconditioning. The idea is to cut open only the upper first welded ring 47b of the lock washer 47. The lower second ring 47a can then be used again with the spacer bolt 46 or welded (welding 49 in Fig. 8 ).
- outer sealing strip 30 which serve to seal the front segments with each other in the circumferential direction.
- the seals which are preferably made of a precipitation-hardened, high-temperature-resistant nickel-base alloy, eg Waspaloy®, are already pre-stressed to each other when cold. This principle provides optimal sealing in all operating conditions.
- the sealing lips of the outer sealing strips 30 are according to Fig. 9 designed opposite to the flow direction 52.
- the sealing is improved by taking advantage of the pressure difference in the flow direction to press the outer sealing strips 30 against each other.
- the outer sealing strips 30 have at the ends of the sealing lips 59 radii R ( Fig. 11 ), so that the mutual wear in the arrangement according to Fig. 9 is minimized. Tilting of the outer weather strip 30 during installation and operation is thus avoided.
- the outer sealing strips 30 are fastened by six fixing clips 53 per seal (FIG. 10, 11 ). These fixing clips 53 have a knob 54, which is guided in a cut-out pocket 57 on the cooling plate 29. This knob 54 absorbs forces in the radial and in the circumferential direction and thus prevents the falling out of the outer weather strip 30.
- a cutout on the fixing clip 53 which is designed to be greater than the thickness of the outer sealing strip 30, allows free movement of the outer sealing strip 30. This prevents stresses in the outer sealing strip 30, which are caused by different thermal expansions of the front plate 28 and heat sink 29.
- the fixing clips 53 are fastened by welding to the cooling plate 29 (FIG. Fig. 11 ). The welding 56 takes place between two feet 58 on the fixing clip 53 (FIG. Fig. 12 ). These feet 58 cause that the fixing clips 53 do not lift by the action of heat of the welding process and thus are no longer parallel to the cooling plate 29. A controlled mobility of the outer weather strip 30 would not be guaranteed in such a case.
- the seal is located above the cooling plate, on the cold side, therefore the cooling plate does not need to be removed.
- the standoffs no longer have to be cut open and hooks and spacers are no longer bent open or removed. Only the fixing clips must be dismantled. Seen from the other side, this also has the advantage that the seals can be mounted after coating.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Die vorliegende Erfindung bezieht sich auf das Gebiet der Gasturbinen. Sie betrifft eine Gasturbine gemäss dem Oberbegriff des Anspruchs 1. Sie betrifft weiterhin ein Verfahren zum Rekonditionieren einer solchen Gasturbine.The present invention relates to the field of gas turbines. It relates to a gas turbine according to the preamble of claim 1. It further relates to a method for reconditioning such a gas turbine.
Moderne stationäre Gasturbinen werden in der Regel mit einer Ringbrennkammer ausgelegt, wie sie in
Die Konstruktion der Frontsegmente zeichnet sich aus durch:
- ● Strapazierfähigkeit
- ● Dauerschwingfestigkeit
- ● Alterungsbeständigkeit
- ● Dauerhaftigkeit
- ● Rekonditionierbarkeit
- ● Einfache Montierbarkeit
- ● De- und Neumontagemöglichkeit bei geschlossener Brennkammer
- ● Geringe Kosten im Life-Cycle (Erst- und Rekonditionierungskosten)
- ● Durability
- ● fatigue strength
- ● aging resistance
- ● durability
- ● Reconditionability
- ● Easy to assemble
- ● Dismantling and reassembly possibility with closed combustion chamber
- ● Low costs in the life cycle (initial and reconditioning costs)
Die Frontsegmente haben folgende Eigenschaften und Funktionen:
- ● Sie bestehen jeweils aus den Hauptkomponenten Frontblech und Kühlblech;
- ● Abdichten der komprimierten Brennerluft gegenüber dem Brennraum;
- ● gegenseitiges Abdichten zum anliegenden Frontsegment in Umfangsrichtung durch äussere Dichtungsstreifen;
- ● rotationssymmetrische Ausführung ;
- ● kein Strukturteil, d.h. nicht selbsttragend; es wird auf der Frontplatte fixiert;
- ● weist versetzte Kühlluftlöcher im Kühlblech gegenüber dem Frontblech auf, d.h. die Kühlung des Bauteils basiert auf Prallkühlung; die Kühlluftlöcher sind geometrisch vorgegeben, sodass der Luftmassenstrom kontrolliert bleibt;
- ● weist Kühlluftlöcher in der Seitenwand des Frontblechs auf, um das Einströmen von Heissgas zu den äusseren Dichtungsstreifen zu vermeiden; dies ist ein sogenanntes "Sidewall-Purging";
- ● weist einen Bewegungsspielraum in axialer sowie radialer Richtung auf, um durch die thermischen Ausdehnungen der Brennkammer, Spannungen zu minimieren;
- ● muss temperaturresistent sein und somit eine gewisse Zeit- bzw. Dauerfestigkeit aufweisen;
- ● muss möglichst einfach und kostengünstig herstellbar sein.
- ● They each consist of the main components front plate and cooling plate;
- ● sealing the compressed burner air against the combustion chamber;
- ● mutual sealing to the adjacent front segment in the circumferential direction by outer sealing strips;
- ● rotationally symmetrical design;
- ● no structural part, ie not self-supporting; it is fixed on the front panel;
- ● has staggered cooling air holes in the heat sink opposite the front plate, ie the cooling of the component is based on impingement cooling; the cooling air holes are geometrically predetermined so that the air mass flow remains controlled;
- ● has cooling air holes in the side wall of the front panel to prevent the flow of hot gas to the outer sealing strips; this is a so-called sidewall purging;
- ● has a range of motion in the axial and radial directions in order to minimize stresses due to the thermal expansion of the combustion chamber;
- ● must be temperature-resistant and thus have a certain time or fatigue resistance;
- ● must be as easy and inexpensive to produce.
Die Frontsegmente sollten vorab auf der Frontplatte montiert werden. Diese Baugruppe wird danach als "Frontplatte komplett" zum Montageort geliefert.The front segments should be mounted in advance on the front panel. This module is then delivered as a "front panel complete" to the installation site.
Beim Rekonditionieren der Frontsegmente werden die äusseren Dichtungsstreifen ersetzt. Beim bisherigen Design sind diese Dichtungen zwischen dem Kühlblech und dem Frontblech eingebaut. Das heisst, um die Dichtungen zu ersetzen, muss man zunächst alle Befestigungen des Kühlblechs wegschneiden, alle Haken sowie obere und untere Kanten aufbiegen und das Kühlblech herausnehmen. Erst dann kann die neue Dichtung eingebaut werden.When reconditioning the front segments, the outer sealing strips are replaced. In the previous design, these seals are installed between the heat sink and the front panel. That is, to replace the seals, you must first cut away all fasteners of the cooling plate, bend all hooks and upper and lower edges and remove the cooling plate. Only then can the new seal be installed.
Ebenfalls sind diese Dichtungen bereits installiert, bevor sie für die TBC Beschichtung am Frontblech zum Beschichtungslieferanten gelangen. Dies hat den negativen Effekt, dass die Dichtungen dem Sandstrahlen ausgesetzt werden und anschliessend zum Beschichten extra abgedeckt werden müssen.These gaskets are also already installed before they reach the coating supplier for the TBC coating on the front panel. This has the negative effect that the seals are exposed to the sandblasting and then have to be covered extra for coating.
Darüber hinaus ergeben sich durch das Einklemmen der äußeren Dichtungsstreifen im Betrieb große plastische Deformationen dieser Dichtungsstreifen.In addition, resulting from the pinching of the outer sealing strips in operation large plastic deformation of these sealing strips.
Es ist daher eine Aufgabe der Erfindung, eine Gasturbine der eingangs genannten Art im Hinblick auf die Frontsegmente so auszulegen, dass die Nachteile der bekannten Lösungen vermieden werden und insbesondere die äusseren Dichtungsstreifen nach dem Beschichten installiert und auch ohne Öffnen der Frontsegmente ausgetauscht werden können, sowie ein Verfahren zu deren Rekonditionierung anzugeben.It is therefore an object of the invention to provide a gas turbine of the type mentioned with respect to the front segments designed so that the disadvantages of the known solutions are avoided and in particular the outer sealing strips installed after coating and can be replaced without opening the front segments, as well to specify a method for their reconditioning.
Es ist auch eine Aufgabe der Erfindung, eine Deformation der Dichtungen zu vermeiden, auch wenn eine grössere Ausdehnung des Frontblechs gegenüber dem Kühlblech stattfindet.It is also an object of the invention to avoid a deformation of the seals, even if a larger extension of the front plate takes place with respect to the cooling plate.
Die Aufgaben werden durch die Ansprüche 1 und 11 gelöst.The objects are achieved by the
Die erfindungsgemässe Gasturbine, die insbesondere eine stationäre Gasturbine ist, umfasst eine ringförmige Brennkammer, welche in radialer Richtung von einer inneren Seitenwand und einer äusseren Seitenwand und in axialer Richtung von einer kreisringförmigen Frontplatte begrenzt wird, durch welche Frontplatte hindurch Brenner mit der Brennkammer in Verbindung stehen, wobei die Frontplatte zur Brennkammer hin zum Schutz gegen Hitzeeinwirkung durch eine Mehrzahl von einen Kreisring bildenden, flächigen Frontsegmenten abgedeckt ist, welche jeweils ein die Vorderseite bildendes Frontblech und ein parallel zum und mit Abstand hinter dem Frontblech angeordnetes Kühlblech umfassen.The gas turbine according to the invention, which is in particular a stationary gas turbine, comprises an annular combustion chamber which is bounded in the radial direction by an inner side wall and an outer side wall and in the axial direction by an annular front plate through which front plate burners communicate with the combustion chamber wherein the front plate is covered to the combustion chamber towards protection against heat by a plurality of circular ring forming, flat front segments, each comprising a front plate forming the front and a parallel to and spaced behind the front plate cooling plate.
Sie ist dadurch gekennzeichnet, dass die Frontsegmente an der Frontplatte lösbar eingehakt gehalten werden, dass zum Abdichten der Frontsegmente inIt is characterized in that the front segments are releasably hooked to the front panel, that for sealing the front segments in
Umfangsrichtung untereinander zwischen benachbarten Frontsegmenten jeweils eine sich in radialer Richtung erstreckende Dichtung angeordnet ist, und dass die Dichtung durch zwei parallel laufende, in der Mitte zwischen den benachbarten Frontsegmenten aneinander stossende äussere Dichtungsstreifen gebildet wird, von denen jeder jeweils auf der Aussenseite am Rand des Kühlbleches des zugehörigen Frontsegmentes befestigt ist.Circumferentially one another between adjacent front segments each extending in the radial direction seal is arranged, and that the seal by two parallel running, in the middle between the adjacent front segments abutting outer sealing strip is formed, each of which on the outside at the edge of the cooling plate the associated front segment is attached.
Eine Ausgestaltung der Gasturbine nach der Erfindung ist dadurch gekennzeichnet, dass die Frontsegmente auf ihrer Rückseite eine Mehrzahl von Haken aufweisen, und dass auf der Vorderseite der Frontplatte Befestigungsbolzen angeordnet sind, welche jeweils eine Hakenaufnahme aufweisen, und in welche die Frontsegmente mit ihren Haken eingehakt sind.An embodiment of the gas turbine according to the invention is characterized in that the front segments have on their back a plurality of hooks, and that on the front of the front plate fixing bolts are arranged, each having a hook receptacle, and in which the front segments are hooked with their hooks ,
Besonders günstig ist es, wenn die Haken an den in radialer Richtung verlaufenden Rändern der Frontsegmente verteilt angeordnet sind, und wenn die Haken und die Hakenaufnahmen derart orientiert sind, dass die Frontsegmente senkrecht zur Segmentfläche weitgehend fixiert sind, während sie parallel zur Segmentfläche ausreichend Bewegungsspielraum zum Ausgleich thermisch bedingter Dehnungen haben.It is particularly advantageous if the hooks are arranged distributed on the edges of the front segments running in the radial direction, and if the hooks and the hook receivers are oriented such that the front segments are largely fixed perpendicular to the segment surface, while they have sufficient freedom of movement parallel to the segment surface Compensation of thermally induced strains.
Gemäss einer anderen Ausgestaltung der Erfindung sind die Befestigungsbolzen an der Frontplatte festgeschraubt, wobei Mittel zur Sicherung der Befestigungsbolzen gegen Verdrehen vorgesehen sind.According to another embodiment of the invention, the fastening bolts are screwed to the front panel, means being provided for securing the fastening bolts against rotation.
Eine weitere Ausgestaltung zeichnet sich dadurch aus, dass das Kühlblech über die Fläche verteilt Löcher aufweist, durch welche zur Prallkühlung des Frontbleches Kühlluft in den Zwischenraum zwischen Frontblech und Kühlblech einströmen kann.A further embodiment is characterized in that the cooling plate has holes distributed over the surface through which cooling air can flow into the intermediate space between the front plate and the cooling plate for impingement cooling of the front plate.
Eine andere Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass in den Frontsegmenten jeweils das Kühlblech mittels verteilt in der Fläche angeordneter Abstandsbolzen auf Abstand zum Frontblech gehalten wird, und dass das Kühlblech auf den Abstandsbolzen mittels von der Rückseite auf die Abstandsbolzen aufgesetzten und mit den Abstandsbolzen durch eine Schweissung fest verbundenen Sicherungsscheiben fixiert ist.Another embodiment of the invention is characterized in that in the front segments in each case the cooling plate is held by distributed in the area arranged spacer bolts at a distance from the front plate, and that the Fuse plate is fixed to the standoff bolt by means of the back of the standoff pins and fixed to the standoffs by a weld firmly connected washers.
Besonders günstig für die Rekonditionierung ist es dabei, wenn die Sicherungsscheiben jeweils aus einem unteren Ring und einem oberen Ring zusammengesetzt sind, und wenn die Sicherungsscheiben nur im Bereich des oberen Ringes mit dem zugehörigen Abstandsbolzen durch die Schweissung fest verbunden sind.It is particularly favorable for the reconditioning, it is when the lock washers are each composed of a lower ring and an upper ring, and when the lock washers are firmly connected only in the region of the upper ring with the associated standoff bolt through the weld.
Eine weitere Ausgestaltung ist dadurch gekennzeichnet, dass die äusseren Dichtungsstreifen aus einer ausscheidungsgehärteten, hochtemperaturfesten Nickelbasislegierung bestehen, dass die äusseren Dichtungsstreifen im kalten Zustand der Gasturbine zueinander vorgespannt sind, dass die äusseren Dichtungsstreifen sich mit ihren Dichtungslippen entgegen der Strömungsrichtung erstrecken, und dass die äusseren Dichtungslippen zur Verringerung des gegenseitigen Verschleisses an ihren freien Enden mit einem Radius versehen sind.A further embodiment is characterized in that the outer sealing strips consist of a precipitation-hardened, high-temperature-resistant nickel-based alloy, that the outer sealing strips are biased to one another in the cold state of the gas turbine, that the outer sealing strips extend with their sealing lips against the flow direction, and that the outer sealing lips To reduce the mutual wear at their free ends are provided with a radius.
Eine andere Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass zur Befestigung der äusseren Dichtungsstreifen entlang dem Rand des Kühlbleches verteilt angeordnete Fixier-Clips vorgesehen sind, dass die äusseren Dichtungsstreifen verschieblich zwischen den Fixier-Clips und dem jeweiligen Kühlblech gehalten werden, und dass die Fixier-Clips jeweils ausserhalb des Bereichs des äusseren Dichtungsstreifens durch eine Schweissung mit dem Kühlblech fest verbunden sindAnother embodiment of the invention is characterized in that for securing the outer sealing strips distributed along the edge of the cooling plate arranged fixing clips are provided, that the outer sealing strips are slidably held between the fixing clips and the respective heat sink, and that the fixing Clips are each outside the range of the outer sealing strip firmly connected by a weld with the heat sink
Insbesondere wird die Verschiebung des äusseren Dichtungsstreifens zwischen den Fixier-Clips und dem zugehörigen Kühlblech jeweils durch einen am Fixier-Clip ausgebildeten Knauf begrenzt, der durch einen grösser ausgelegten Ausschnitt im äusseren Dichtungsstreifen hindurch in eine darunter angeordnete Tasche im Kühlblech eintaucht.In particular, the displacement of the outer sealing strip between the fixing clips and the associated cooling plate is limited in each case by a knob formed on the fixing clip, which penetrates through a larger cutout in the outer sealing strip into a pocket arranged underneath in the cooling plate.
Das erfindungsgemässe Verfahren zum Rekonditionieren einer Gasturbine nach der Erfindung ist dadurch gekennzeichnet, dass zum Abnehmen des Kühlbleches die mit den Abstandsbolzen verschweissten oberen Ringe abgetrennt werden, dass die verbleibenden unteren Ringe von den Abstandsbolzen abgezogen werden, und dass zum erneuten Fixieren des Kühlbleches auf den Abstandsbolzen die verbliebenen unteren Ringe wieder auf die Abstandsbolzen aufgesetzt und mit den Abstandsbolzen durch eine Schweissung fest verbunden werden.The inventive method for reconditioning a gas turbine according to the invention is characterized in that for removing the cooling plate, the welded with the standoffs upper rings are separated, that the remaining lower rings are deducted from the standoffs, and that for re-fixing the cooling plate on the standoffs The remaining lower rings are put back on the distance bolts and firmly connected to the distance bolts by welding.
Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen im Zusammenhang mit der Zeichnung näher erläutert werden. Es zeigen
- Fig. 1
- in einem Ausschnitt den Längsschnitt durch eine Gasturbine, wie sie zur Realisierung der Erfindung geeignet ist;
- Fig. 2
- in einer Ansicht schräg von vorne ein Frontsegment gemäss einem Ausführungsbeispiel der Erfindung;
- Fig. 3
- das Frontsegment aus
Fig. 2 in einer Ansicht schräg von hinten; - Fig. 4
- in einem Ausschnitt schräg von hinten gesehen den Anschlussbereich zwischen zwei benachbarten Frontsegmenten gemäss einem Ausführungsbeispiel der Erfindung;
- Fig. 5
- in einer Schnittdarstellung die Befestigung des Frontsegmentes an der Frontplatte gemäss einem Ausführungsbeispiel der Erfindung;
- Fig. 6-8
- verschiedene Schritte beim Rekonditionieren gemäss einem Ausführungsbeispiel der Erfindung;
- Fig. 9
- in einer Schnittdarstellung den Übergangsbereich zwischen zwei benachbarten Frontsegmenten gemäss einem Ausführungsbeispiel der Erfindung;
- Fig. 10
- in einer Explosionsdarstellung die Befestigung eines äusseren Dichtungsstreifens am Frontsegment gemäss einem Ausführungsbeispiel der Erfindung;
- Fig. 11
- den Schnitt durch die Befestigungsanordnung gemäss
Fig. 10 ; - Fig. 12
- die Befestigungsanordnung gemäss
Fig. 10 in der Draufsicht von oben; und - Fig. 13
- eine schematisierte Darstellung einer stationären Gasturbine mit sequenzieller Verbrennung aus dem Stand der Technik.
- Fig. 1
- in a section of the longitudinal section through a gas turbine, as is suitable for implementing the invention;
- Fig. 2
- in a view obliquely from the front, a front segment according to an embodiment of the invention;
- Fig. 3
- the front segment off
Fig. 2 in a view obliquely from behind; - Fig. 4
- seen in a section obliquely from behind the connection area between two adjacent front segments according to an embodiment of the invention;
- Fig. 5
- in a sectional view of the attachment of the front segment on the front panel according to an embodiment of the invention;
- Fig. 6-8
- various steps in reconditioning according to an embodiment of the invention;
- Fig. 9
- in a sectional view, the transition region between two adjacent front segments according to an embodiment of the invention;
- Fig. 10
- in an exploded view, the attachment of an outer weather strip on the front segment according to an embodiment of the invention;
- Fig. 11
- the section through the mounting arrangement according to
Fig. 10 ; - Fig. 12
- the fastening arrangement according to
Fig. 10 in the top view from above; and - Fig. 13
- a schematic representation of a stationary gas turbine with sequential combustion of the prior art.
Die Befestigung der Frontsegmente 23 an der Frontplatte 45 erfolgt gemäss
Das Befestigungsprinzip des Frontsegments 23 anhand der Befestigungsbolzen 39 beruht auf Festklemmen, d.h. die Hakenaufnahme 40 des Befestigungsbolzens 39 klemmt über die Auflageflache der Haken 35 des Frontsegments 23 in axialer Richtung (senkrecht zur Segmentfläche) das Frontsegment 23 fest. Dieses Prinzip ermöglicht selbst bei grosser Krafteinwirkung trotzdem eine Verschiebung des Frontsegments in Radial- und in Umfangsrichtung (in der Ebene der Segmentfläche). Diese Beweglichkeit ist nötig, um die unterschiedlichen thermischen Dehnungen von unterschiedlichen Komponenten zu kompensieren.The fastening principle of the
Die Befestigung des Kühlblechs 29 auf dem Frontblech 28 erfolgt mittels Befestigungen 38, die gemäss
Am Frontsegment 23 gemäss
Die Dichtlippen der äusseren Dichtungsstreifen 30 sind gemäss
Befestigt werden die äusseren Dichtungsstreifen 30 durch je sechs Fixierclips 53 pro Dichtung (
Ein Vergleich des vorgeschlagenen neuen Designs mit dem alten Design ergibt insbesondere Folgendes: Beim bisherigen Design befand sich die Dichtung zwischen Frontblech und Kühlblech; deshalb mussten stets alle Abstandsbolzen aufgeschnitten, die Haken aufgebogen und die Distanzstücke entfernt werden, weil das Kühlblech demontiert werden musste.A comparison of the proposed new design with the old design reveals in particular the following: In the previous design, the seal was between the front panel and the cooling plate; therefore, all spacers always had to be cut open, the hooks bent and the spacers removed, because the heat sink had to be dismantled.
Beim neuen Design befindet sich die Dichtung oberhalb vom Kühlblech, auf der kalten Seite, deshalb muss hierfür das Kühlblech nicht mehr entfernt werden. Die Abstandsbolzen müssen nicht mehr aufgeschnitten sowie Haken und Distanzstücke nicht mehr aufgebogen, respektive entfernt werden. Lediglich die Fixierclips müssen demontiert werden. Dies bringt eben von der anderen Seite her betrachtet auch den Vorteil, dass die Dichtungen nach dem Beschichten montiert werden können.With the new design, the seal is located above the cooling plate, on the cold side, therefore the cooling plate does not need to be removed. The standoffs no longer have to be cut open and hooks and spacers are no longer bent open or removed. Only the fixing clips must be dismantled. Seen from the other side, this also has the advantage that the seals can be mounted after coating.
Das Rekonditionieren eines Frontsegments beinhaltet jedoch nicht zwingend ausschließlich ein Ersetzen der Dichtungsstreifen; es können weitere Reparaturen nötig sei, wobei das Entfernen des Kühlblechs nötig wird. In einen solchen Fall würden dann trotzdem Abstandsbolzen/Haken /Distanzstücke aufgeschnitten/aufgebogen/entfernt werden. Hier würde dann ein zweites Verwenden der Sicherungsscheibe gemäß
- 10,2010.20
- Gasturbinegas turbine
- 1111
- Verdichtercompressor
- 12,1612.16
- Brennstoffzufuhrfuel supply
- 13,21,2213,21,22
- Brennerburner
- 14,17,2414,17,24
- Brennkammercombustion chamber
- 15,1815.18
- Turbineturbine
- 1919
- Maschinenachsemachine axis
- 2323
- Frontsegmentfront segment
- 2525
- äussere Seitenwandouter side wall
- 2626
- innere Seitenwandinner sidewall
- 2727
- HeissgaspfadHot gas path
- 2828
- FrontblechFrontblech
- 2929
- Kühlblechheatsink
- 3030
- äusserer Dichtungsstreifenouter weather strip
- 31,3231.32
- Öffnungopening
- 33,3433.34
- Lochhole
- 3535
- Hakenhook
- 3636
- obere Kanteupper edge
- 3737
- untere Kantelower edge
- 3838
- Befestigungattachment
- 3939
- Befestigungsbolzenmounting bolts
- 4040
- HakenaufnahmeEuro hook
- 4141
- Gewindelochthreaded hole
- 4242
- Sicherungsbohrunglock hole
- 4343
- Sicherungsstiftsafety pin
- 4444
- InbusschraubeAllen screw
- 4545
- Frontplattefront panel
- 4646
- AbstandsbolzenStandoffs
- 4747
- Sicherungsscheibelock washer
- 47a47a
- unterer Ringlower ring
- 47b47b
- oberer Ringupper ring
- 48,49,5648,49,56
- Schweissungwelding
- 5050
- Dichtung (zwei Dichtungsstreifen 30)Seal (two sealing strips 30)
- 5151
- Zwischenraumgap
- 5252
- Strömungsrichtungflow direction
- 5353
- Fixier-ClipFixing clip
- 5454
- Knaufknob
- 5555
- Ausschnittneckline
- 5757
- Taschebag
- 5858
- FussFoot
- 5959
- Dichtlippesealing lip
- RR
- Radiusradius
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH02032/10A CH704185A1 (en) | 2010-12-06 | 2010-12-06 | GAS TURBINE AND METHOD FOR recondition SUCH GAS TURBINE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2463583A1 true EP2463583A1 (en) | 2012-06-13 |
EP2463583B1 EP2463583B1 (en) | 2016-09-21 |
Family
ID=43920352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11190982.6A Not-in-force EP2463583B1 (en) | 2010-12-06 | 2011-11-28 | Gas turbine and method for reconditioning such a gas turbine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2463583B1 (en) |
AU (1) | AU2011253595B2 (en) |
CH (1) | CH704185A1 (en) |
MY (1) | MY157102A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105465830A (en) * | 2014-09-30 | 2016-04-06 | 阿尔斯通技术有限公司 | Combustor front panel |
EP3299720A1 (en) * | 2016-09-22 | 2018-03-28 | Ansaldo Energia IP UK Limited | Combustor front assembly for a gas turbine |
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-
2010
- 2010-12-06 CH CH02032/10A patent/CH704185A1/en not_active Application Discontinuation
-
2011
- 2011-11-22 AU AU2011253595A patent/AU2011253595B2/en not_active Ceased
- 2011-11-28 EP EP11190982.6A patent/EP2463583B1/en not_active Not-in-force
- 2011-11-30 MY MYPI2011005787A patent/MY157102A/en unknown
Patent Citations (14)
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US5285632A (en) * | 1993-02-08 | 1994-02-15 | General Electric Company | Low NOx combustor |
WO1996004510A1 (en) | 1994-08-01 | 1996-02-15 | Bmw Rolls-Royce Gmbh | Thermal shield for a gas turbine combustion chamber |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN105465830A (en) * | 2014-09-30 | 2016-04-06 | 阿尔斯通技术有限公司 | Combustor front panel |
CN105465830B (en) * | 2014-09-30 | 2020-06-05 | 安萨尔多能源瑞士股份公司 | Burner front panel |
EP3299720A1 (en) * | 2016-09-22 | 2018-03-28 | Ansaldo Energia IP UK Limited | Combustor front assembly for a gas turbine |
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Also Published As
Publication number | Publication date |
---|---|
CH704185A1 (en) | 2012-06-15 |
AU2011253595B2 (en) | 2015-07-16 |
EP2463583B1 (en) | 2016-09-21 |
AU2011253595A1 (en) | 2012-06-21 |
MY157102A (en) | 2016-04-29 |
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