EP2513432B1 - Steam turbine in triple shell design - Google Patents

Steam turbine in triple shell design Download PDF

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Publication number
EP2513432B1
EP2513432B1 EP10790445.0A EP10790445A EP2513432B1 EP 2513432 B1 EP2513432 B1 EP 2513432B1 EP 10790445 A EP10790445 A EP 10790445A EP 2513432 B1 EP2513432 B1 EP 2513432B1
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EP
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Prior art keywords
flow
pressure
inner casing
steam
cooling steam
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EP10790445.0A
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German (de)
French (fr)
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EP2513432A1 (en
Inventor
Christian Cukjati
Heinz Dallinger
Thomas Müller
Rainer Quinkertz
Norbert Thamm
Andreas Ulma
Michael Wechsung
Uwe Zander
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Siemens AG
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Siemens AG
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    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/26—Double casings; Measures against temperature strain in casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines

Definitions

  • the invention relates to a turbomachine comprising a rotor rotatably mounted about a rotation axis, an inner inner housing arranged around the rotor and an outer inner housing, wherein an outer housing is arranged around the inner inner housing and the outer inner housing, wherein the turbomachine forms a first flood formed for high pressure steam a second flood formed for medium-pressure steam, wherein the second flood is aligned opposite to the first flood.
  • a steam turbine conventionally includes a rotatably mounted rotor and a housing disposed about the rotor. Between the rotor and the inner housing, a flow channel is formed.
  • the housing in a steam turbine must be able to fulfill several functions.
  • the guide vanes are arranged in the flow channel on the housing and, secondly, the inner housing must withstand the pressure and the temperatures of the flow medium for all load and special operating cases.
  • the flow medium is steam.
  • the housing must be designed such that inlets and outlets, which are also referred to as taps, are possible. Another feature that a case must meet is the possibility of a shaft end passing through the case.
  • nickel-base alloys are suitable because they withstand the stresses occurring at high temperatures.
  • the use of such a nickel-based alloy is associated with new challenges.
  • the cost of nickel-base alloys is comparatively high and, in addition, the manufacturability of nickel-based alloys, e.g. limited by limited casting possibilities.
  • the use of nickel-based materials must be minimized.
  • the nickel-based materials are poor heat conductors.
  • the temperature gradients over the wall thickness are so rigid that thermal stresses are comparatively high.
  • the WO 2007 / 006754A1 discloses a combined steam turbine that is double-flow.
  • the DE 34 21 067 A1 discloses a three-shell turbomachine.
  • the high-pressure part and the medium-pressure part are accommodated in an outer housing.
  • the high-pressure part is supplied with live steam, which usually has the highest steam parameters such as temperature and pressure and directly flows from the steam generator to the high-pressure turbine section.
  • the steam flowing out of the high-pressure part after expansion is in turn passed out of the steam turbine and led to a reheater unit of a boiler, where it is heated again to a higher temperature, which may correspond to the live steam temperature.
  • This reheated steam is then passed back into the turbomachine in the medium-pressure part and then flows through a medium-pressure blading.
  • the high-pressure part and the medium-pressure part in this case have oppositely arranged flow directions.
  • Such embodiments are called reverse flow fluid machines. But there are also known flow machines, which are manufactured in a so-called single-flow design. In this type of construction, the high-pressure part and the medium-pressure part are arranged one after the other and are flowed through in the same flow direction.
  • the inner housing is in this case formed in an inner inner housing and an outer inner housing.
  • the inner inner housing is located in the region of the inflow area and must therefore withstand the high temperatures and the high pressures. Therefore, the inner inner housing is made of a suitable material, such as a nickel-based alloy or a higher quality material such as a steel, which comprises 9 - 10 wt .-% chromium. Between the inner inner housing and the rotor of the flow channel is formed.
  • the inner inner housing therefore has means, such as grooves, for carrying vanes therein.
  • To the inner case is a outer inner housing arranged.
  • the outer inner housing is designed such that it is seen in the flow direction, adjacent to the inner inner housing and constitutes a boundary of the flow channel, wherein in the outer inner housing devices such as grooves, are provided to carry vanes can.
  • the outer inner casing is acted upon by vapor introduction into the cooling steam space with a steam having a lower temperature and a lower pressure, so that the material of the outer inner casing must be less heat-resistant than the material of the inner inner casing.
  • the outer inner housing is formed of a less high-quality material.
  • an outer housing is arranged around the inner inner housing and the outer inner housing.
  • the turbomachine has a first flood, which is acted upon by a high-pressure steam and flows in a first flow direction. Furthermore, the turbomachine has a second flood, which is acted upon by medium-pressure steam and flows in a second flow direction. The second flow direction is opposite to the first flow direction, so that this flow machine is designed in a so-called reverse flow design.
  • the high-pressure inflow region and the medium-pressure inflow region are surrounded or formed by an inner inner housing.
  • the inner inner housing is made of a higher quality material and only receives the high pressure and medium pressure inflow including the balance piston and the Leitschaufelnuten up to the stage, which is essential for temperature and strength reasons. As a result, the inner inner housing kept compact to save space and also has a lower weight.
  • a cooling steam flow line For the flow of cooling steam into the cooling steam space, a cooling steam flow line is provided.
  • the cooling steam flow line is fluidically connected to the second flow. This means that the medium-pressure steam is mainly flowed into the cooling steam space, which has ideal steam parameters to adequately cool the inner inner housing.
  • the first flood has a high-pressure outflow area and the second flood has a medium-pressure outflow area, wherein the outer inner housing extends from the high-pressure outflow area to the medium-pressure outflow area.
  • the outer inner housing therefore extends over almost the entire blading area of the rotor, with the outer inner housing having means for supporting vanes. However, not the entire flow area is formed with vanes in the outer inner housing. In the area of the inner inner housing, no vanes are arranged in the outer inner housing. In this area, the inner inner casing is sheathed by the outer inner casing.
  • the outer inner housing is in this case formed of an upper part and a lower part. The upper part and the lower part are in turn formed from one piece and extend over the first and second flood.
  • the outer inner housing along the first flood and the second flood is formed.
  • a cooling steam space is formed between the inner inner housing and the outer inner housing.
  • the cooling steam in operation between the inner inner casing and the outer inner casing simultaneously constitutes the insulation to the outer inner casing which defines the cooling steam space and the inner inner casing encloses and forms the expansion path behind the cooling steam extraction.
  • the outer inner housing is in contact with this cooling steam and can therefore be made or formed of a lower quality material than the inner inner housing.
  • the primary and secondary stresses in the outer inner casing are only affected by the difference between the vapor state of the vapor in the cooling steam space and the medium pressure exhaust steam.
  • Primary stresses are mechanical stresses that arise as a result of external loads, eg due to vapor pressures, weight forces and the like.
  • secondary voltages are meant, for example, thermoelectric voltages and represent mechanical stresses that arise as a result of unbalanced temperature fields or impediments to thermal expansion (thermal Verzwteil Heidelberg).
  • the turbomachine is formed, inter alia, in the cooling steam space with a drainage pipe, which at a standstill or startup drains an accumulating condensation water or ensures sufficient residual flow in the event of failure of a tap, which could be exemplified by steam extraction via nozzles from the refrigerator.
  • cooling steam space is formed with adedampfausströmungstechnisch for flowing cooling steam from the cooling steam space. Due to the continuous operation of the cooling steam from the cooling steam space in the operation, a very good cooling is obtained, whereby the material utilization (in particular primary and secondary stresses) are lower in the turbomachine.
  • the inner inner housing is in this case made of a higher quality material than the outer inner housing.
  • the inner inner housing is formed in a first embodiment of a high-chromium material comprising 9 - 10 wt .-% chromium.
  • the inner housing is formed from a nickel-based material.
  • the outer inner casing is formed of a material comprising 1 - 2 wt .-% chromium.
  • the steam turbine 1 shown in FIG. 1 is an embodiment of a turbomachine.
  • the steam turbine 1 comprises an outer housing 2, an inner inner housing 3, an outer inner housing 4 and a rotatably mounted rotor 5.
  • the rotor 5 is rotatably mounted about a rotation axis 6.
  • the outer housing 2 is formed from an upper part and a lower part, wherein the upper part is shown above the axis of rotation 6 and the lower part below the axis of rotation 6 in the plane of the drawing.
  • Both the inner inner housing 3 and the outer inner housing 4 likewise have an upper part and a lower part which, as in the case of the outer housing 2, is arranged above and below the axis of rotation 6.
  • the inner inner casing 3, the outer inner casing 4 and the outer casing 2 each have a horizontal parting line.
  • a high-pressure steam flows into a high-pressure inflow region 7. Subsequently, the high-pressure steam flows along a first flow direction 9 through a blading 8, not shown, which comprises guide vanes and rotor blades. The blades are hereby arranged on the rotor 5 and the guide vanes on the inner inner casing 3 and outer inner casing 4. The temperature and the pressure of the high-pressure steam are thereby reduced.
  • the high-pressure steam subsequently flows out of a high-pressure outflow region 10 out of the turbomachine to a reheater unit, not shown in greater detail. Furthermore, not shown, is the fluidic connection between the Hochdruckausström Scheme 10 and the reheater unit.
  • the medium-pressure blading 13 has guide vanes and rotor blades, not shown. The blades are hereby arranged on the rotor 5 and the guide vanes on the inner inner casing 3 and outer inner casing 4.
  • the medium-pressure steam flowing through the medium-pressure blading 13 then flows out of a medium-pressure outflow region 14 out of the outer inner casing 4 and then flows out of the turbomachine 1 via a discharge stub 15.
  • the inner inner casing 3 and the outer inner casing 4 are arranged around the rotor 5.
  • the outer casing 2 is arranged.
  • the inner inner housing 3 is formed in the region of the high-pressure inflow region 7 and the medium-pressure inflow region 11. Since the temperatures of the steam are highest in the high-pressure inflow region 7 and in the medium-pressure inflow region 11, the inner inner casing 3 is made of a material of higher value.
  • the inner inner casing 3 is formed of a nickel-based alloy.
  • the inner inner casing 3 is formed of a higher grade material comprising 9-10 wt.% Chromium.
  • the outer inner housing 4 may be formed of a less high-quality material.
  • the inner outer housing may be formed from a steel having 1-2% by weight chromium.
  • the outer inner housing 4 extends at least from the Hochdruckausström Suite 10 along the axis of rotation 6 to the medium-pressure Ausström Suite 14. That means that the inner inner housing 3 is disposed in the region of the high-pressure inflow region 7 and the medium-pressure inflow region 11 within the outer inner housing 4. Between the inner inner casing 3 and the outer inner casing 4, a cooling steam space 16 is formed. This cooling steam space 16 is formed with a cooling steam flow line for flowing cooling steam.
  • the cooling steam 16 is removed at a suitable location from the medium-pressure blading 13 and can be removed, for example, to a gap 17 between the inner inner casing 3 and the outer inner casing 4. In this case, the cooling steam space 16 must be sealed to the blading 8.
  • the cooling steam could optionally be supplied via the gap 17 from the medium-pressure blading 13 or via a second gap 22 from the blading 8. The respective other side would have to be closed by a suitable first seal 23 or second seal 24.
  • the outer inner casing 4 is formed along the first flow 18 and the second flow 19.
  • the cooling steam flow line is not shown in detail in the figure.
  • the outer inner housing 4 has aharidampfausströmungs effet for the flow of cooling steam from the cooling steam space 16.
  • the inner inner housing 3 takes the high-pressure inflow region 7 and the medium-pressure inflow region 11 including one Balancing piston 20 and not shown Leitschaufelnuten up to the stage, which is essential for temperature and strength reasons.
  • the inner inner housing 3 is characterized relatively small and thus cost-saving and offers a broadening of the potential suppliers because of the low tonnage.
  • the cooling steam flowing out of the cooling steam chamber 16 again leads to a good cooling effect.
  • This outflowing cooling steam can be guided, for example, through the outer inner housing 4 into an exhaust-steam space 21 or e.g. be removed by a tap.
  • the inner inner housing 3 and the outer inner housing 4 are sealed against each other by means of seals.
  • a drainage line not shown, which dissipates an accumulating condensate at a standstill or startup of the steam turbine 1 or ensures sufficient residual flow in case of failure of the tap.
  • the inner inner housing 3, the outer inner housing 4 and the outer housing 2 are pressure-bearing.

Abstract

The machine i.e. steam turbine (1), has an external housing (2) arranged around an internal inner housing (3) and an external inner housing (4). The engine has a flow (18) for high pressure steam and another flow (19) for medium pressure stream. The latter flow is aligned opposite to the former flow, which comprises a high pressure inflow region (7). The latter flow comprises a medium pressure inflow region (11). The internal housing is arranged around the high and medium pressure regions and is made of 9 grams equivalent weight percentage to 10 grams equivalent weight percentage of chromium.

Description

Die Erfindung betrifft eine Strömungsmaschine umfassend einen um eine Rotationsachse drehbar gelagerten Rotor, ein um den Rotor angeordnetes inneres Innengehäuse und ein äußeres Innengehäuse, wobei um das innere Innengehäuse und das äußere Innengehäuse ein Außengehäuse angeordnet ist, wobei die Strömungsmaschine eine für Hochdruckdampf ausgebildete erste Flut und eine für Mitteldruckdampf ausgebildete zweite Flut aufweist, wobei die zweite Flut entgegengesetzt zur ersten Flut ausgerichtet ist.The invention relates to a turbomachine comprising a rotor rotatably mounted about a rotation axis, an inner inner housing arranged around the rotor and an outer inner housing, wherein an outer housing is arranged around the inner inner housing and the outer inner housing, wherein the turbomachine forms a first flood formed for high pressure steam a second flood formed for medium-pressure steam, wherein the second flood is aligned opposite to the first flood.

Unter einer Strömungsmaschine wird beispielsweise eine Dampfturbine verstanden. Eine Dampfturbine weist üblicher Weise einen drehbar gelagerten Rotor und ein Gehäuse, das um den Rotor angeordnet ist auf. Zwischen dem Rotor und dem Innengehäuse ist ein Strömungskanal ausgebildet. Das Gehäuse in einer Dampfturbine muss mehrere Funktionen erfüllen können. Zum einen werden die Leitschaufeln im Strömungskanal am Gehäuse angeordnet und zum zweiten muss das Innengehäuse den Druck und den Temperaturen des Strömungsmediums für alle Last- und besondere Betriebsfälle standhalten. Bei einer Dampfturbine ist das Strömungsmedium Dampf. Des Weiteren muss das Gehäuse derart ausgebildet sein, dass Zu- und Abführungen, die auch als Anzapfungen bezeichnet werden, möglich sind. Eine weitere Funktion, die ein Gehäuse erfüllen muss, ist die Möglichkeit, dass ein Wellenende durch das Gehäuse durchgeführt werden kann.Under a turbomachine, for example, a steam turbine is understood. A steam turbine conventionally includes a rotatably mounted rotor and a housing disposed about the rotor. Between the rotor and the inner housing, a flow channel is formed. The housing in a steam turbine must be able to fulfill several functions. On the one hand, the guide vanes are arranged in the flow channel on the housing and, secondly, the inner housing must withstand the pressure and the temperatures of the flow medium for all load and special operating cases. In a steam turbine, the flow medium is steam. Furthermore, the housing must be designed such that inlets and outlets, which are also referred to as taps, are possible. Another feature that a case must meet is the possibility of a shaft end passing through the case.

Bei den im Betrieb auftretenden hohen Spannungen, Drücken und Temperaturen ist es erforderlich, dass die Werkstoffe geeignet ausgewählt werden sowie die Konstruktion derart gewählt ist, dass die mechanische Integrität und Funktionalität ermöglicht wird. Dafür ist es erforderlich, dass hochwertige Werkstoffe zum Einsatz kommen, insbesondere im Bereich der Einströmung und der ersten Leitschaufelnuten.The high voltages, pressures, and temperatures that occur during operation require that the materials be properly selected and that the design be selected to provide mechanical integrity and functionality. For this it is necessary that high quality Materials are used, in particular in the field of inflow and the first Leitschaufelnuten.

Für die Anwendungen bei Frischdampftemperaturen von über 650°C, wie z.B. 700°C, sind Nickel-Basis-Legierungen geeignet, da sie den bei hohen Temperaturen auftretenden Belastungen standhalten. Allerdings ist die Verwendung einer solchen Nickel-Basis-Legierung mit neuen Herausforderungen verbunden. So sind die Kosten für Nickel-Basis-Legierungen vergleichsweise hoch und außerdem ist die Fertigbarkeit von Nickel-Basis-Legierungen, z.B. durch beschränkte Gussmöglichkeit begrenzt. Dies führt dazu, dass die Verwendung von Nickel-Basis-Werkstoffen minimiert werden muss. Des Weiteren sind die Nickel-Basis-Werkstoffe schlechte Wärmeleiter. Dadurch sind die Temperaturgradienten über der Wandstärke so starr, dass Thermospannungen vergleichsweise hoch sind. Des Weiteren ist zu berücksichtigen, dass bei der Verwendung von Nickel-Basis-Werkstoffen die Temperaturdifferenz zwischen Ein- und Auslass der Dampfturbine steigt.For applications at live steam temperatures in excess of 650 ° C, e.g. 700 ° C, nickel-base alloys are suitable because they withstand the stresses occurring at high temperatures. However, the use of such a nickel-based alloy is associated with new challenges. Thus, the cost of nickel-base alloys is comparatively high and, in addition, the manufacturability of nickel-based alloys, e.g. limited by limited casting possibilities. As a result, the use of nickel-based materials must be minimized. Furthermore, the nickel-based materials are poor heat conductors. As a result, the temperature gradients over the wall thickness are so rigid that thermal stresses are comparatively high. Furthermore, it must be taken into account that when using nickel-based materials, the temperature difference between the inlet and outlet of the steam turbine increases.

Es werden derzeit verschiedene Konzepte verfolgt, um eine Dampfturbine bereitzustellen, die für hohe Temperaturen und für hohe Drücke geeignet ist. So ist es bekannt, eine aus mehreren Teilen umfassende Innengehäusestruktur in eine Außengehäusestruktur einzuarbeiten gemäß dem Artikel Y. Tanaka et al. "Advanced Design of Mitsubishi Large Steam Turbines", Mitsubishi Heavy Industries, Power Gen Europe, 2003, Düsseldorf, May 06.-08., 2003 .Various concepts are currently being pursued to provide a steam turbine suitable for high temperatures and high pressures. Thus, it is known to incorporate a multi-part inner housing structure in an outer housing structure according to the article Y. Tanaka et al. Mitsubishi Heavy Industries, Power Gen Europe, 2003, Dusseldorf, May 06.-08., 2003 ,

Es ist ebenso bekannt, ein Innengehäuse aus zwei Teilen auszubilden gemäß DE 10 2006 027 237 A1 .It is also known to form an inner housing of two parts according to DE 10 2006 027 237 A1 ,

In der DE 342 1067 wird ebenfalls eine mehrkomponentige Innengehäusestruktur offenbart sowie in der DE 103 53 451 A1 .In the DE 342 1067 is also disclosed a multi-component inner housing structure and in the DE 103 53 451 A1 ,

Die WO 2007/006754A1 offenbart eine kombinierte Dampfturbine, die zweiflutig ausgeführt ist.The WO 2007 / 006754A1 discloses a combined steam turbine that is double-flow.

Die DE 34 21 067 A1 offenbart eine dreischalige Strömungsmaschine.The DE 34 21 067 A1 discloses a three-shell turbomachine.

In einer besonderen Ausführungsform der Strömungsmaschine sind der Hochdruck-Teil und der Mitteldruck-Teil in einem Außengehäuse untergebracht. Der Hochdruck-Teil wird mit Frischdampf beaufschlagt, der in der Regel die höchsten Dampfparameter wie Temperatur und Druck aufweist und direkt vom Dampferzeuger zur Hochdruck-Teilturbine strömt. Der aus dem Hochdruck-Teil nach Expansion ausströmende Dampf wird wiederum aus der Dampfturbine geleitet und zu einer Zwischenüberhitzereinheit eines Kessels geführt, um dort wieder auf eine höhere Temperatur, die der Frischdampftemperatur entsprechen kann, zu erhitzen. Dieser zwischenüberhitzte Dampf wird anschließend wieder in die Strömungsmaschine in den Mitteldruck-Teil geleitet und strömt anschließend durch eine Mitteldruck-Beschaufelung. Der Hochdruck-Teil und der Mitteldruck-Teil weisen hierbei entgegengesetzt angeordnete Strömungsrichtungen auf. Solche Ausführungsformen werden Reverse-Flow-Strömungsmaschinen genannt. Es sind aber auch Strömungsmaschinen bekannt, die in einer so genannten Single-Flow-Bauart gefertigt werden. In dieser Bauart ist der Hochdruck-Teil und der Mitteldruck-Teil nacheinander angeordnet und wird in derselben Strömungsrichtung durchströmt.In a particular embodiment of the turbomachine, the high-pressure part and the medium-pressure part are accommodated in an outer housing. The high-pressure part is supplied with live steam, which usually has the highest steam parameters such as temperature and pressure and directly flows from the steam generator to the high-pressure turbine section. The steam flowing out of the high-pressure part after expansion is in turn passed out of the steam turbine and led to a reheater unit of a boiler, where it is heated again to a higher temperature, which may correspond to the live steam temperature. This reheated steam is then passed back into the turbomachine in the medium-pressure part and then flows through a medium-pressure blading. The high-pressure part and the medium-pressure part in this case have oppositely arranged flow directions. Such embodiments are called reverse flow fluid machines. But there are also known flow machines, which are manufactured in a so-called single-flow design. In this type of construction, the high-pressure part and the medium-pressure part are arranged one after the other and are flowed through in the same flow direction.

Es ist Aufgabe der Erfindung, eine weitere Möglichkeit anzubieten, eine Strömungsmaschine auszubilden.It is an object of the invention to offer a further possibility to form a turbomachine.

Gelöst wird diese Aufgabe durch die Merkmale des Anspruchs 1. In den Unteransprüchen sind vorteilhafte Weiterbildungen angegeben.This object is achieved by the features of claim 1. In the dependent claims advantageous developments are given.

Ein wesentlicher Gedanke der Erfindung ist es, eine dreischalige Dampfturbine auszubilden. Das Innengehäuse wird hierbei in ein inneres Innengehäuse und ein äußeres Innengehäuse ausgebildet. Das innere Innengehäuse ist im Bereich des Einströmbereichs angeordnet und muss daher den hohen Temperaturen und den hohen Drücken standhalten. Daher ist das innere Innengehäuse aus einem geeigneten Material, wie z.B. aus einer Nickel-Basislegierung oder aus einem höherwertigen Werkstoff wie z.B. einen Stahl, der 9 - 10 Gew.-% Chrom umfasst. Zwischen dem inneren Innengehäuse und dem Rotor ist der Strömungskanal ausgebildet. Das innere Innengehäuse weist daher Vorrichtungen wie z.B. Nuten, um darin Leitschaufeln zu tragen. Um das Innengehäuse ist ein äußeres Innengehäuse angeordnet. Wesentlich hierbei ist, dass zwischen dem inneren Innengehäuse und dem äußeren Innengehäuse ein Kühldampfraum entsteht, der mit Kühlmedium beaufschlagt wird. Das äußere Innengehäuse ist dabei derart ausgebildet, dass es in Strömungsrichtung gesehen, an das innere Innengehäuse angrenzt und eine Begrenzung des Strömungskanals darstellt, wobei auch in dem äußeren Innengehäuse Vorrichtungen wie z.B. Nuten, vorgesehen sind, um Leitschaufeln tragen zu können.An essential idea of the invention is to form a three-shell steam turbine. The inner housing is in this case formed in an inner inner housing and an outer inner housing. The inner inner housing is located in the region of the inflow area and must therefore withstand the high temperatures and the high pressures. Therefore, the inner inner housing is made of a suitable material, such as a nickel-based alloy or a higher quality material such as a steel, which comprises 9 - 10 wt .-% chromium. Between the inner inner housing and the rotor of the flow channel is formed. The inner inner housing therefore has means, such as grooves, for carrying vanes therein. To the inner case is a outer inner housing arranged. It is essential that between the inner inner housing and the outer inner housing, a cooling steam space is formed, which is acted upon by cooling medium. The outer inner housing is designed such that it is seen in the flow direction, adjacent to the inner inner housing and constitutes a boundary of the flow channel, wherein in the outer inner housing devices such as grooves, are provided to carry vanes can.

Das äußere Innengehäuse wird durch Dampfeinleitung in den Kühldampfraum mit einem Dampf beaufschlagt, der eine geringere Temperatur und einen geringeren Druck aufweist, so dass das Material des äußeren Innengehäuses weniger warmfest sein muss als das Material des inneren Innengehäuses. Insbesondere genügt es, wenn das äußere Innengehäuse aus einem weniger hochwertigen Werkstoff ausgebildet ist. Um das innere Innengehäuse und dem äußeren Innengehäuse ist ein Außengehäuse angeordnet.The outer inner casing is acted upon by vapor introduction into the cooling steam space with a steam having a lower temperature and a lower pressure, so that the material of the outer inner casing must be less heat-resistant than the material of the inner inner casing. In particular, it is sufficient if the outer inner housing is formed of a less high-quality material. Around the inner inner housing and the outer inner housing, an outer housing is arranged.

Die Strömungsmaschine weist eine erste Flut auf, die mit einem Hochdruckdampf beaufschlagt wird und in einer ersten Strömungsrichtung strömt. Des Weiteren weist die Strömungsmaschine eine zweite Flut auf, die mit Mitteldruckdampf beaufschlagt wird und in einer zweiten Strömungsrichtung strömt. Die zweite Strömungsrichtung ist entgegengesetzt zur ersten Strömungsrichtung, so dass diese Strömungsmaschine in einer so genannten Reverse-Flow-Bauart ausgebildet ist. Der Hochdruck-Einströmbereich und der Mitteldruck-Einströmbereich werden von einem inneren Innengehäuse umgeben bzw. ausgebildet. Das innere Innengehäuse wird aus einem höherwertigen Material gefertigt und nimmt nur die Hochdruck- und Mitteldruck-Einströmung inklusive dem Ausgleichskolben sowie den Leitschaufelnuten bis zu der Stufe auf, die aus Temperatur- und Festigkeitsgründen unbedingt notwendig ist. Dadurch kann das innere Innengehäuse kompakt gehalten platzsparend gefertigt werden und weist darüber hinaus ein geringeres Gewicht auf.The turbomachine has a first flood, which is acted upon by a high-pressure steam and flows in a first flow direction. Furthermore, the turbomachine has a second flood, which is acted upon by medium-pressure steam and flows in a second flow direction. The second flow direction is opposite to the first flow direction, so that this flow machine is designed in a so-called reverse flow design. The high-pressure inflow region and the medium-pressure inflow region are surrounded or formed by an inner inner housing. The inner inner housing is made of a higher quality material and only receives the high pressure and medium pressure inflow including the balance piston and the Leitschaufelnuten up to the stage, which is essential for temperature and strength reasons. As a result, the inner inner housing kept compact to save space and also has a lower weight.

Zum Zuströmen von Kühldampf in den Kühldampfraum ist eine Kühldampfströmungsleitung vorgesehen. Die Kühldampfströmungsleitung ist strömungstechnisch mit der zweiten Flut verbunden. Das bedeutet, dass der MitteldruckDampf vorwiegend in den Kühldampfraum eingeströmt wird, der ideale Dampfparameter aufweist, um das innere Innengehäuse adäquat zu kühlen.For the flow of cooling steam into the cooling steam space, a cooling steam flow line is provided. The cooling steam flow line is fluidically connected to the second flow. This means that the medium-pressure steam is mainly flowed into the cooling steam space, which has ideal steam parameters to adequately cool the inner inner housing.

Die erste Flut weist einen Hochdruck-Ausströmbereich und die zweite Flut einen Mitteldruck-Ausströmbereich auf, wobei das äußere Innengehäuse sich von dem Hochdruck-Ausströmbereich bis zum Mitteldruck-Ausströmbereich erstreckt. Das äußere Innengehäuse erstreckt sich daher nahezu über den gesamten Beschaufelungsbereich des Rotors, wobei das äußere Innengehäuse Vorrichtungen aufweist, um Leitschaufeln zu tragen. Allerdings wird nicht der gesamte Strömungsbereich mit Leitschaufeln im äußeren Innengehäuse ausgebildet. Im Bereich des inneren Innengehäuses, sind im äußeren Innengehäuse keine Leitschaufeln angeordnet. In diesem Bereich wird das innere Innengehäuse durch das äußere Innengehäuse ummantelt. Das äußere Innengehäuse wird hierbei aus einem Oberteil und einem Unterteil ausgebildet. Das Oberteil als auch das Unterteil sind wiederum aus einem Stück ausgebildet und erstrecken sich über die erste und zweite Flut.The first flood has a high-pressure outflow area and the second flood has a medium-pressure outflow area, wherein the outer inner housing extends from the high-pressure outflow area to the medium-pressure outflow area. The outer inner housing therefore extends over almost the entire blading area of the rotor, with the outer inner housing having means for supporting vanes. However, not the entire flow area is formed with vanes in the outer inner housing. In the area of the inner inner housing, no vanes are arranged in the outer inner housing. In this area, the inner inner casing is sheathed by the outer inner casing. The outer inner housing is in this case formed of an upper part and a lower part. The upper part and the lower part are in turn formed from one piece and extend over the first and second flood.

In einer vorteilhaften Weiterbildung ist das äußere Innengehäuse entlang der ersten Flut und der zweiten Flut ausgebildet.In an advantageous development, the outer inner housing along the first flood and the second flood is formed.

In einer vorteilhaften Weiterbildung ist zwischen dem inneren Innengehäuse und dem äußeren Innengehäuse ein Kühldampfraum ausgebildet. Der zwischen dem inneren Innengehäuse und dem äußeren Innengehäuse im Betrieb befindliche Kühldampf stellt gleichzeitig die Isolierung zum äußeren Innengehäuse dar, welches den Kühldampfraum und das innere Innengehäuse umschließt und den Expansionspfad hinter der Kühldampfentnahme ausbildet. Das äußere Innengehäuse befindet sich im Kontakt zu diesem Kühldampf und kann daher aus einem minderwertigeren Material als das innere Innengehäuse gefertigt bzw. ausgebildet sein. Darüber hinaus werden die Primär- und Sekundärspannungen im äußeren Innengehäuse lediglich durch die Differenz zwischen dem Dampfzustand des Dampfes im Kühldampfraum und des Mitteldruck-Abdampfes beeinflusst. Primärspannungen sind mechanische Spannungen, die in Folge von äußeren Lasten, z.B. durch Dampfdrücke, Gewichtskräfte und ähnliches entstehen. Unter Sekundärspannungen sind beispielsweise Thermospannungen zu verstehen und stellen mechanische Spannungen dar, die in Folge von nicht ausgeglichenen Temperaturfeldern oder Behinderungen der Wärmedehnungen (thermische Verzwängungen) entstehen.In an advantageous development, a cooling steam space is formed between the inner inner housing and the outer inner housing. The cooling steam in operation between the inner inner casing and the outer inner casing simultaneously constitutes the insulation to the outer inner casing which defines the cooling steam space and the inner inner casing encloses and forms the expansion path behind the cooling steam extraction. The outer inner housing is in contact with this cooling steam and can therefore be made or formed of a lower quality material than the inner inner housing. In addition, the primary and secondary stresses in the outer inner casing are only affected by the difference between the vapor state of the vapor in the cooling steam space and the medium pressure exhaust steam. Primary stresses are mechanical stresses that arise as a result of external loads, eg due to vapor pressures, weight forces and the like. By secondary voltages are meant, for example, thermoelectric voltages and represent mechanical stresses that arise as a result of unbalanced temperature fields or impediments to thermal expansion (thermal Verzwängungen).

Die Strömungsmaschine wird unter anderem im Kühldampfraum mit einer Entwässerungsleitung ausgebildet, die bei einem Stillstand oder Startvorgang ein anfallendes Kondensationswasser ableitet oder bei einem Ausfall einer Anzapfung, welche durch Dampfentnahme über Stutzen aus dem Kühlraum beispielhaft realisiert sein könnte, eine ausreichende Restbeströmung sicherstellt.The turbomachine is formed, inter alia, in the cooling steam space with a drainage pipe, which at a standstill or startup drains an accumulating condensation water or ensures sufficient residual flow in the event of failure of a tap, which could be exemplified by steam extraction via nozzles from the refrigerator.

In einer vorteilhaften Weiterbildung ist der Kühldampfraum mit einer Kühldampfausströmungsleitung zum Ausströmen von Kühldampf aus dem Kühldampfraum ausgebildet. Durch das im Betrieb fortwährende Ausströmen des Kühldampfes aus dem Kühldampfraum wird eine sehr gute Kühlung erwirkt, wodurch die Werkstoffauslastungen (insbesondere Primär- und Sekundärspannungen) in der Strömungsmaschine geringer werden.In an advantageous development of the cooling steam space is formed with a Kühldampfausströmungsleitung for flowing cooling steam from the cooling steam space. Due to the continuous operation of the cooling steam from the cooling steam space in the operation, a very good cooling is obtained, whereby the material utilization (in particular primary and secondary stresses) are lower in the turbomachine.

In einer vorteilhaften Weiterbildung ist der Hochdruck-Ausströmbereich mit einer Zwischenüberhitzerleitung verbunden. Dadurch kann der Hochdruckdampf zu einem Zwischenüberhitzer geleitet werden und von einer niedrigen Temperatur auf eine hohe Temperatur erhitzt werden.In an advantageous development of the high pressure Ausströmbereich is connected to a reheater line. This allows the high pressure steam to be passed to a reheater and heated from a low temperature to a high temperature.

Das innere Innengehäuse ist hierbei aus einem höherwertigen Werkstoff ausgebildet als das äußere Innengehäuse. Das innere Innengehäuse ist in einer ersten Ausführungsform aus einem hochchromigen Werkstoff, der 9 - 10 Gew.-% Chrom umfasst ausgebildet. In einer zweiten vorteilhaften Weiterbildung ist das Innengehäuse aus einem Nickel-Basiswerkstoff ausgebildet. Das äußere Innengehäuse ist aus einem Werkstoff, der 1 - 2 Gew.-% Chrom umfasst ausgebildet.The inner inner housing is in this case made of a higher quality material than the outer inner housing. The inner inner housing is formed in a first embodiment of a high-chromium material comprising 9 - 10 wt .-% chromium. In a second advantageous development, the inner housing is formed from a nickel-based material. The outer inner casing is formed of a material comprising 1 - 2 wt .-% chromium.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung beschrieben. Diese sollen die Ausführungsbeispiele nicht maßstäblich darstellen, vielmehr ist die Zeichnung in schematisierter und/oder leicht verzerrter Form ausgeführt. Im Hinblick auf Ergänzungen der aus der Zeichnung unmittelbar erkennbaren Lehren wird hier auf den einschlägigen Stand der Technik verwiesen.Embodiments of the invention are described below with reference to the drawing. These are not intended to represent the embodiments to scale, but the drawing is executed in a schematic and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made here to the relevant prior art.

Im Einzelnen zeigt die Zeichnung in:

Figur 1
eine Schnittdarstellung durch eine zweiflutige Dampfturbine.
In detail, the drawing shows in:
FIG. 1
a sectional view through a twin-flow steam turbine.

Die in Figur 1 dargestellte Dampfturbine 1 ist eine Ausführungsform einer Strömungsmaschine. Die Dampfturbine 1 umfasst ein Außengehäuse 2, ein inneres Innengehäuse 3, ein äußeres Innengehäuse 4 sowie einen drehbar gelagerten Rotor 5 auf. Der Rotor 5 ist um eine Rotationsachse 6 drehbar gelagert. Das Außengehäuse 2 ist aus einem Oberteil und einem Unterteil ausgebildet, wobei das Oberteil oberhalb der Rotationsachse 6 und das Unterteil unterhalb der Rotationsachse 6 in der Zeichenebene dargestellt ist. Sowohl das innere Innengehäuse 3 und das äußere Innengehäuse 4 weist ebenfalls ein Oberteil und ein Unterteil auf, das wie beim Außengehäuse 2 ausgeführt, oberhalb und unterhalb der Rotationsachse 6 angeordnet ist. Somit weisen das innere Innengehäuse 3, das äußere Innengehäuse 4 und das Außengehäuse 2 jeweils eine horizontale Teilfuge auf.The steam turbine 1 shown in FIG. 1 is an embodiment of a turbomachine. The steam turbine 1 comprises an outer housing 2, an inner inner housing 3, an outer inner housing 4 and a rotatably mounted rotor 5. The rotor 5 is rotatably mounted about a rotation axis 6. The outer housing 2 is formed from an upper part and a lower part, wherein the upper part is shown above the axis of rotation 6 and the lower part below the axis of rotation 6 in the plane of the drawing. Both the inner inner housing 3 and the outer inner housing 4 likewise have an upper part and a lower part which, as in the case of the outer housing 2, is arranged above and below the axis of rotation 6. Thus, the inner inner casing 3, the outer inner casing 4 and the outer casing 2 each have a horizontal parting line.

Im Betrieb strömt ein Hochdruckdampf in einen Hochdruck-Einströmbereich 7. Anschließend strömt der Hochdruckdampf entlang einer ersten Strömungsrichtung 9 durch eine nicht näher dargestellte Beschaufelung 8, die Leitschaufeln und Laufschaufeln umfasst. Die Laufschaufeln sind hierbei auf dem Rotor 5 und die Leitschaufeln am inneren Innengehäuse 3 und äußeren Innengehäuse 4 angeordnet. Die Temperatur und der Druck des Hochdruckdampfes werden dadurch verringert. Der Hochdruckdampf strömt anschließend aus einem Hochdruck-Ausströmbereich 10 aus der Strömungsmaschine zu einer nicht näher dargestellten Zwischenüberhitzereinheit. Des Weiteren nicht dargestellt, ist die strömungstechnische Verbindung zwischen dem Hochdruckausströmbereich 10 und der Zwischenüberhitzereinheit.During operation, a high-pressure steam flows into a high-pressure inflow region 7. Subsequently, the high-pressure steam flows along a first flow direction 9 through a blading 8, not shown, which comprises guide vanes and rotor blades. The blades are hereby arranged on the rotor 5 and the guide vanes on the inner inner casing 3 and outer inner casing 4. The temperature and the pressure of the high-pressure steam are thereby reduced. The high-pressure steam subsequently flows out of a high-pressure outflow region 10 out of the turbomachine to a reheater unit, not shown in greater detail. Furthermore, not shown, is the fluidic connection between the Hochdruckausströmbereich 10 and the reheater unit.

Nachdem der Hochdruckdampf nach der Zwischenüberhitzung wieder auf hohe Temperatur erhitzt wurde, strömt dieser Dampf als Mitteldruckdampf über einen Mitteldruck-Einströmbereich 11 entlang einer zweiten Strömungsrichtung 12 entlang einer Mitteldruck-Beschaufelung 13. Die Mitteldruckbeschaufelung 13 weist nicht näher dargestellte Leit- und Laufschaufeln auf. Die Laufschaufeln sind hierbei auf dem Rotor 5 und die Leitschaufeln am inneren Innengehäuse 3 und äußeren Innengehäuse 4 angeordnet. Der durch die Mitteldruck-Beschaufelung 13 strömende Mitteldruckdampf strömt anschließend aus einem Mitteldruck-Ausströmbereich 14 aus dem äußeren Innengehäuse 4 aus und strömt anschließend über ein Ausströmstutzen 15 aus der Strömungsmaschine 1 heraus. Das innere Innengehäuse 3 und das äußere Innengehäuse 4 sind um den Rotor 5 angeordnet. Um das innere Innengehäuse 3 und das äußere Innengehäuse 4 ist das Außengehäuse 2 angeordnet. Das innere Innengehäuse 3 ist im Bereich des Hochdruck-Einströmbereiches 7 und dem Mitteldruck-Einströmbereiches 11 ausgebildet. Da im Hochdruck-Einströmbereich 7 und im Mitteldruck-Einströmbereich 11 die Temperaturen des Dampfes am höchsten sind, wird das innere Innengehäuse 3 aus einem höherwertigen Material gefertigt. In einer ersten Ausführungsform wird das innere Innengehäuse 3 aus einer Nickel-Basis-Legierung ausgebildet. In einer zweiten Ausführungsform wird das innere Innengehäuse 3 aus einem höherwertigen Material, das 9 - 10 Gew.-% Chrom umfasst, ausgebildet. Das äußere Innengehäuse 4 kann aus einem weniger hochwertigen Material ausgebildet sein. In einer Ausführungsform kann das innere Außengehäuse aus einem Stahl mit 1 - 2 Gew.-% Chrom ausgebildet sein.After the high-pressure steam has been reheated to high temperature after reheating, this vapor flows as medium-pressure steam over a medium-pressure inflow region 11 along a second flow direction 12 along a mean-pressure blading 13. The medium-pressure blading 13 has guide vanes and rotor blades, not shown. The blades are hereby arranged on the rotor 5 and the guide vanes on the inner inner casing 3 and outer inner casing 4. The medium-pressure steam flowing through the medium-pressure blading 13 then flows out of a medium-pressure outflow region 14 out of the outer inner casing 4 and then flows out of the turbomachine 1 via a discharge stub 15. The inner inner casing 3 and the outer inner casing 4 are arranged around the rotor 5. Around the inner inner casing 3 and the outer inner casing 4, the outer casing 2 is arranged. The inner inner housing 3 is formed in the region of the high-pressure inflow region 7 and the medium-pressure inflow region 11. Since the temperatures of the steam are highest in the high-pressure inflow region 7 and in the medium-pressure inflow region 11, the inner inner casing 3 is made of a material of higher value. In a first Embodiment, the inner inner casing 3 is formed of a nickel-based alloy. In a second embodiment, the inner inner casing 3 is formed of a higher grade material comprising 9-10 wt.% Chromium. The outer inner housing 4 may be formed of a less high-quality material. In one embodiment, the inner outer housing may be formed from a steel having 1-2% by weight chromium.

Das äußere Innengehäuse 4 erstreckt sich zumindest vom Hochdruckausströmbereich 10 entlang der Rotationsachse 6 bis zum Mitteldruck-Ausströmbereich 14. Das bedeutet, dass das innere Innengehäuse 3 im Bereich des Hochdruck-Einströmbereichs 7 und dem Mitteldruck-Einströmbereich 11 innerhalb des äußeren Innengehäuses 4 angeordnet wird. Zwischen dem inneren Innengehäuse 3 und dem äußeren Innengehäuse 4 ist ein Kühldampfraum 16 ausgebildet. Dieser Kühldampfraum 16 ist mit einer Kühldampfströmungsleitung zum Zuströmen von Kühldampf ausgebildet. Der Kühldampf 16 wird an einer geeigneten Stelle aus der Mitteldruck-Beschaufelung 13 entnommen und kann beispielsweise an einen Spalt 17 zwischen dem inneren Innengehäuse 3 und dem äußeren Innengehäuse 4 entnommen werden. Dabei muss der Kühldampfraum 16 zur Beschaufelung 8 abgedichtet werden. Der Kühldampf könnte wahlweise über den Spalt 17 aus der Mitteldruck-Beschaufelung 13 oder über einen zweiten Spalt 22 aus der Beschaufelung 8 versorgt werden. Die jeweils andere Seite müsste durch eine geeignete erste Abdichtung 23 bzw. zweite Abdichtung 24 verschlossen werden.The outer inner housing 4 extends at least from the Hochdruckausströmbereich 10 along the axis of rotation 6 to the medium-pressure Ausströmbereich 14. That means that the inner inner housing 3 is disposed in the region of the high-pressure inflow region 7 and the medium-pressure inflow region 11 within the outer inner housing 4. Between the inner inner casing 3 and the outer inner casing 4, a cooling steam space 16 is formed. This cooling steam space 16 is formed with a cooling steam flow line for flowing cooling steam. The cooling steam 16 is removed at a suitable location from the medium-pressure blading 13 and can be removed, for example, to a gap 17 between the inner inner casing 3 and the outer inner casing 4. In this case, the cooling steam space 16 must be sealed to the blading 8. The cooling steam could optionally be supplied via the gap 17 from the medium-pressure blading 13 or via a second gap 22 from the blading 8. The respective other side would have to be closed by a suitable first seal 23 or second seal 24.

Das äußere Innengehäuse 4 ist entlang der ersten Flut 18 und der zweiten Flut 19 ausgebildet. Die Kühldampfströmungsleitung ist in der Figur nicht näher dargestellt. Das äußere Innengehäuse 4 weist eine Kühldampfausströmungsleitung zum Ausströmen von Kühldampf aus dem Kühldampfraum 16 auf. Das innere Innengehäuse 3 nimmt mit anderen Worten den Hochdruck-Einströmbereich 7 und den Mitteldruck-Einströmbereich 11 inklusive einem Ausgleichskolben 20 und nicht näher dargestellte Leitschaufelnuten bis zu der Stufe auf, die aus Temperatur- und Festigkeitsgründen unbedingt notwendig ist. Das innere Innengehäuse 3 ist dadurch verhältnismäßig klein und somit kostensparend und bietet wegen der geringen Tonnage eine Verbreiterung der potentiellen Lieferanten.The outer inner casing 4 is formed along the first flow 18 and the second flow 19. The cooling steam flow line is not shown in detail in the figure. The outer inner housing 4 has a Kühldampfausströmungsleitung for the flow of cooling steam from the cooling steam space 16. In other words, the inner inner housing 3 takes the high-pressure inflow region 7 and the medium-pressure inflow region 11 including one Balancing piston 20 and not shown Leitschaufelnuten up to the stage, which is essential for temperature and strength reasons. The inner inner housing 3 is characterized relatively small and thus cost-saving and offers a broadening of the potential suppliers because of the low tonnage.

Der aus dem Kühldampfraum 16 wieder ausströmende Kühldampf führt zu einer guten Kühlwirkung. Dieser ausströmende Kühldampf kann beispielweise durch das äußere Innengehäuse 4 in einen Abdampfraum 21 geführt oder z.B. durch eine Anzapfung abgeführt werden. Das innere Innengehäuse 3 und das äußere Innengehäuse 4 werden gegeneinander mittels Dichtungen abgedichtet. Im Kühldampfraum 16 ist eine nicht näher dargestellte Entwässerungsleitung, die bei einem Stillstand oder Startvorgang der Dampfturbine 1 ein anfallendes Kondenswasser ableitet oder bei einem Ausfall der Anzapfung eine ausreichende Restdurchströmung sicherstellt.The cooling steam flowing out of the cooling steam chamber 16 again leads to a good cooling effect. This outflowing cooling steam can be guided, for example, through the outer inner housing 4 into an exhaust-steam space 21 or e.g. be removed by a tap. The inner inner housing 3 and the outer inner housing 4 are sealed against each other by means of seals. In the cooling steam chamber 16 is a drainage line, not shown, which dissipates an accumulating condensate at a standstill or startup of the steam turbine 1 or ensures sufficient residual flow in case of failure of the tap.

Das innere Innengehäuse 3, das äußere Innengehäuse 4 und das Außengehäuse 2 sind drucktragend ausgebildet.The inner inner housing 3, the outer inner housing 4 and the outer housing 2 are pressure-bearing.

Claims (8)

  1. Turbomachine, comprising a rotor (5) mounted rotatably about an axis of rotation (6), the turbomachine having a first flow (18) designed for high-pressure steam and a second flow (19) designed for medium-pressure steam, the second flow (19) being oriented opposite to the first flow (18), the first flow (18) having a high-pressure inflow region (7) and the second flow (19) a medium-pressure inflow region (11), and the internal inner casing (3) being arranged around the high-pressure inflow region (7) and the medium-pressure inflow region (11), characterized by an internal inner casing (3) arranged around the rotor (5) and an external inner casing (4), an outer casing (2) being arranged around the internal inner casing (3) and the external inner casing (4), a cooling steam space (16) being formed between the internal inner casing (3) and the external inner casing (4), and a cooling steam flow line is provided for the inflow of cooling steam into the cooling steam space (16), the cooling steam flow line being connected fluidically to the second flow (19), the first flow (18) having a high-pressure outflow region (10) and the second flow (19) a medium-pressure outflow region (14), the external inner casing (4) extending from the high-pressure outflow region (10) as far as the medium-pressure outflow region (14).
  2. Turbomachine according to Claim 1, the external inner casing (4) being formed along the first flow (18) and the second flow (19).
  3. Turbomachine according to one of the preceding claims, the cooling steam space (16) being designed with a cooling steam outflow line for the outflow of cooling steam from the cooling steam space (16).
  4. Turbomachine according to one of the preceding claims, the high-pressure outflow region (10) being connectable to a reheater line.
  5. Turbomachine according to one of the preceding claims, the internal inner casing (3) being formed from a higher-grade material than the external inner casing (4).
  6. Turbomachine according to Claim 5, the internal inner casing (3) being formed from a high-chromium material which comprises 9-10% by weight of chromium.
  7. Turbomachine according to Claim 5, the internal inner casing (3) being formed from a nickel-based material.
  8. Turbomachine according to Claims 5, 6 or 7, the external inner casing (4) being formed from a material which comprises 1-2% by weight of chromium.
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US20120257959A1 (en) 2012-10-11
JP5551268B2 (en) 2014-07-16
JP2013513758A (en) 2013-04-22
EP2513432A1 (en) 2012-10-24
EP2336506A1 (en) 2011-06-22
WO2011082984A1 (en) 2011-07-14

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