EP0169779A1 - Assembly for controlling the extraction pressure of a condensation turbine - Google Patents

Assembly for controlling the extraction pressure of a condensation turbine Download PDF

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Publication number
EP0169779A1
EP0169779A1 EP85401457A EP85401457A EP0169779A1 EP 0169779 A1 EP0169779 A1 EP 0169779A1 EP 85401457 A EP85401457 A EP 85401457A EP 85401457 A EP85401457 A EP 85401457A EP 0169779 A1 EP0169779 A1 EP 0169779A1
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EP
European Patent Office
Prior art keywords
pressure
steam
annular
adjusting
turbine
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Granted
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EP85401457A
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German (de)
French (fr)
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EP0169779B1 (en
Inventor
Heinz Stetter
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Alstom SA
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Alstom SA
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Priority to AT85401457T priority Critical patent/ATE37587T1/en
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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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • 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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
    • F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
    • F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
    • 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
    • F01D3/00—Machines or engines with axial-thrust balancing effected by working-fluid
    • F01D3/02—Machines or engines with axial-thrust balancing effected by working-fluid characterised by having one fluid flow in one axial direction and another fluid flow in the opposite direction

Definitions

  • the invention relates to a device for regulating the extraction pressure of a extraction condensation turbine, in which steam for heating or chemical process purposes is withdrawn from a stage of the blade duct of the medium-pressure part or the high-pressure part and in which the steam remaining in the turbine is a double-flow low-pressure part is supplied, with pivotable blades or blade parts from downstream of the steam extraction point (s) arranged guide grids, the blade pivoting movement via adjusting lever or arms by axial displacement of the adjusting lever or arm supporting adjusting rings.
  • the invention is therefore based on the object of simplifying the device of the type mentioned in such a way that it can predominantly be used as an internal control device;
  • a motor-driven axial displacement drive is to be used, the pressure fluid of which is compatible with the turbine working fluid.
  • a full-walled, axially immovable partition wall is provided between the two annular disc pistons and is in the radial gap between the radial inner ring housing wall and connected to the low pressure spaces behind the adjustable guide vanes
  • a labyrinth seal is arranged in the rotor shaft in the area between the bores connecting the suction chamber of each ring disk piston with the radial gap.
  • the adjusting device is largely arranged in the annular space 1 - that is, an already existing space - between the two first impeller stages 2a, 2b of a double-flow, low-pressure turbine symmetrical with respect to the turbine stages.
  • the low-pressure turbine is preferably part of a heating steam extraction turbine, the heating steam being drawn off at the outlet of the medium-pressure part 3 and the steam flow remaining in the turbine after removal being fed unthrottled to the annular space 1 via an overflow line from the medium-pressure outlet.
  • the adjusting device has a ring housing, which is arranged coaxially to the rotor shaft 4 and surrounds it at a distance (radial gap 5) and lies in the interior of the door frame, which comprises a radially outer casing 7, two annular disks 9 which are perpendicular to the longitudinal axis 8 of the rotor and a radially inner casing 10.
  • a ring housing which is arranged coaxially to the rotor shaft 4 and surrounds it at a distance (radial gap 5) and lies in the interior of the door frame, which comprises a radially outer casing 7, two annular disks 9 which are perpendicular to the longitudinal axis 8 of the rotor and a radially inner casing 10.
  • Arranged in the annular space 6 of the ring housing are two annular disk pistons 11, 12, which rest on one or more (preferably - for the purpose of achieving stable guidance of the annular disk pistons - several) coaxial guide rods 13 are axially displaceably mounted.
  • the washer pistons 11, 12 are provided on their radially outer and radially inner circumferential surfaces with sealing tips 14 which form labyrinth seals in the radial gaps between the washer pistons 11, 12 and the outer and inner circumferential surfaces of the washer pistons, with low leakage flows through the labyrinth seals for the maintenance of a Ensure pressure difference on the washer pistons 11, 12.
  • an adjusting ring 15 is firmly connected to the side facing the impeller 2.
  • Adjusting levers 16 are supported on the adjusting rings 15; the other ends of the adjusting levers 16 are connected in a rotationally rigid manner to the radially inner ends of each of a radially directed axis 17.
  • the axes 17 pass through the associated guide vane in the longitudinal direction thereof and are non-rotatably connected to the guide vane or a part thereof and are supported and guided rotatably with their radially outer ends in a recess 19 in the inflow housing 20 or a guide vane carrier.
  • the rotation of the guide vanes 18 or guide vane parts takes place by an axial displacement of the annular disc pistons 11, 12, which, as is known per se, results in a pivoting movement of the adjusting levers 16 and, consequently, in a rotary movement of the guide vanes 18 or their pivotable parts
  • different constructive solutions of the mechanical adjustment rods 15, 16, 17 are also possible.
  • the axial adjustment of the annular disc pistons 11, 12 is carried out by the steam's own steam of sufficiently high pressure, which via a control pressure line 21 and bores 22 in the outer jacket, or corresponding lines, into the two pressure chambers 23a, 23b at the end facing the corresponding adjusting ring 15 and the adjusting levers 16 the washer piston 11, 12 is passed.
  • the space (suction space) between the inner annular disc piston end faces is connected via one or more bores 24 or recesses in the inner jacket to the radial gap 5, and thus - as a result of the axial gap 29 - to the spaces of low pressure behind the guide vanes 18.
  • the axial displacement of the annular disc pistons 11, 12 has to be carried out against the sum of the axial steam power components of the adjustable guide vanes 18.
  • the pressure in the pressure chambers 23a, 23b must be set in order to keep the total axial force from the axial vapor force components in balance. Since the axial force components on the guide vanes 18 always act in the opening direction, the direction of the compressive force on each annular disk piston 11, 12 is always the same.
  • a control valve 25 is provided in the control pressure line 21 outside the turbine housing, which is preferably operatively connected to a turbine tap for regenerative feed water preheating: higher pressure.
  • the control of the control valve 25 is carried out according to the known control of the (external) throttle valve in the overflow line, so that there is no need to go into this detail.
  • Each guide vane 18 does not need to be pivoted.
  • Each guide vane 18 can consist of a fixed front part 18a, the axis of rotation 17 and an adjustable (pivotable) part 18b (FIG. 3).
  • the fixed parts 18b carry the adjusting device and connect them to the inlet housing part of the low pressure turbine.
  • the adjustable parts 18b serve to regulate the steam extraction pressure by changing the flow cross section of the two first guide grids 18.
  • the axis 17 can, see FIG. 1, be an integral part of the adjustable part 18b; but it can also - see FIG. 3 - be pushed through corresponding recesses in the parts 18a, 18b and connected to the adjustable part 18b via a known wedge connection 26, in which a torque can be transmitted by frictional engagement and positive engagement.
  • the axial displacement of the washer pistons can be limited by stops.
  • compression springs can be connected between the annular disk pistons 11, 12, which is not shown in further detail.
  • the device described above can be expanded with simple measures such that two extraction pressures can be regulated for heating or process purposes (FIG. 2).
  • the adjusting device that can be used for this differs from the adjusting device according to FIG. 1 (only) in that a full-walled, axially immovable partition wall 27 is provided between the annular disc pistons 11, 12, that each pressure chamber 23a or 23b has a control pressure line 21 'and one each Control valve 25 'is connected to the associated control steam source such that each suction chamber has a bore 24' with the radial gap 5 is connected, and that in the radial gap 5 between the bores 24 t a shaft seal (labyrinth seal) is provided with sealing tips 28 preferably attached to the inner jacket 10.
  • a shaft seal (labyrinth seal) is provided with sealing tips 28 preferably attached to the inner jacket 10.

Abstract

This invention relates to a device for controlling the extraction pressure of an extraction condensing turbine with pivotable vanes or vane parts of guide vane lattices arranged downstream of the steam extraction point(s) where the pivoting motion of the vanes is effected by means of adjusting levers or arms by axial displacement of adjusting rings forming the bearings said adjusting levers or arms. According to the invention, the adjusting rings (15) are solidly connected to annular pistons (11, 12) which are axially slidably supported in the annular space (6) of an annular casing (7, 9, 10) arranged coaxially to and surrounding the rotor shaft (4) on one or a plurality of coaxial rods (13) or similar guiding means and which are provided with seal strips (14) on their radially outer and radially inner peripheral surfaces; furthermore, the pressure spaces (23a, 23b) of the two annular pistons (11, 12) are supplyable via pipes (21, 22) with the turbine's own steam at a correspondingly high pressure whereas the suction space or, respectively, each suction space communicates through corresponding passages (24, 5, 29) with the low-pressure spaces downstream of the guide vanes (18).

Description

Die Erfindung bezieht sich auf eine Einrichtung zur Regelung des Entnahmedrucks einer Entnahme-Kondensationsturbine, bei der aus einer Stufe-des Schaufelkanals des Mitteldruckteils bzw. des Hochdruckteils Dampf für Heizzwecke oder chemische Prozeßzwecke entnommen wird und bei der der in der Turbine verbleibende Dampf einem zweiflutigen Niederdruckteil zugeführt wird, mit schwenkbaren Schaufeln oder Schaufelteilen von stromabwärts der Dampfentnahmestelle (n) angeordneten Leitgittern, wobei die Schaufelschwenkbewegung über Verstellhebel oder -arme durch Axialverschiebung von die Verstellhebel oder yarme abstützenden Verstellringen erfolgt.The invention relates to a device for regulating the extraction pressure of a extraction condensation turbine, in which steam for heating or chemical process purposes is withdrawn from a stage of the blade duct of the medium-pressure part or the high-pressure part and in which the steam remaining in the turbine is a double-flow low-pressure part is supplied, with pivotable blades or blade parts from downstream of the steam extraction point (s) arranged guide grids, the blade pivoting movement via adjusting lever or arms by axial displacement of the adjusting lever or arm supporting adjusting rings.

Um den Druck bei erhöhter Entnahmemenge zu halten oder sogar noch zu steigern, ist es beispielsweise bekannt, in die Überströmleitung zwischen Mitteldruck- und Niederdruckteil eine entsprechend steuerbare Drosselklappe einzubauen. Nachteilig ist, daß die Drosselung mit einem Gefälleverlust verbunden ist, der einen Verlust an elektrischer Leistung zur Folge hat.In order to maintain or even increase the pressure with an increased withdrawal quantity, it is known, for example, to install a correspondingly controllable throttle valve in the overflow line between the medium-pressure and low-pressure part. It is disadvantageous that the throttling is associated with a loss of gradient which results in a loss of electrical power.

Um den vorgenannten Nachteil zu vermeiden, ist es bei Heizkraftwerken bekannt, stromabwärts der Dampfentnahmestelle angeordnete, mittels einer Vorrichtung verschwenkbare Leitschaufeln vorzusehen. - Eine solche Regelungseinrichtung ist beispielsweise aus der DE-OS 25 13 581 bekannt, jedoch fehlen dort konkrete Angaben über die Mittel zum Axialverschieben des mit den Verstellarmen verbundenen Verstellringes.In order to avoid the above-mentioned disadvantage, it is known in heating power plants to have a guide arranged downstream of the steam extraction point and pivotable by means of a device to provide shovels. - Such a control device is known for example from DE-OS 25 13 581, but there is no concrete information about the means for axially displacing the adjusting ring connected to the adjusting arms.

Soweit der Anmelderin bekannt, scheiterte bisher die praktische Verwirklichung verstellbarer Leitschaufeln in großen Entnahme-Kondensationsturbinen, weil Verstelleinrichtungen im Innern mehrgehäusiger Turbinen sich als zu kompliziert gestalteten und meist ölhydraulisch zu betätigen sind. Die Verwendung von Öl ist jedoch problematisch, da Öl wegen der Brandgefahr von heißem Dampf fernzuhalten ist.As far as the applicant is aware, the practical implementation of adjustable guide vanes in large extraction condensation turbines has hitherto failed, because adjusting devices in the interior of multi-casing turbines are too complicated and are usually operated by oil hydraulics. However, the use of oil is problematic because oil must be kept away from hot steam due to the risk of fire.

Der Erfindung liegt daher die Aufgabe zugrunde, die Einrichtung der eingangs genannten Art derart zu vereinfachen, daß sie überwiegend als interne Regeleinrichtung eingesetzt werden kann; außerdem soll ein motorischer Axialverschiebetrieb Anwendung finden, dessen Druckfluid mit-dem Turbinenarbeitsmittelgut verträglich ist.The invention is therefore based on the object of simplifying the device of the type mentioned in such a way that it can predominantly be used as an internal control device; In addition, a motor-driven axial displacement drive is to be used, the pressure fluid of which is compatible with the turbine working fluid.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 beanspruchten Merkmale gelöst.This object is achieved by the features claimed in the characterizing part of claim 1.

Werden zwei Anzapfdampfmengen unterschiedlichen Druckes für Heiz- oder chemische Prozeßzwecke entnommen, dann ist in weiterer Ausgestaltung der Erfindung zwischen den beiden Ringscheibenkolben eine vollwandige, axial unverschiebliche Trennwand vorgesehen und ist im mit den Räumen niedrigen Druckes hinter den verstellbaren Leitschaufeln verbundenen Radialspalt zwischen radialer innerer Ringehäusewand und Rotorwelle im Bereich zwischen den den Saugraum jedes Ringscheibenkolbens mit dem Radialspalt verbindenden Bohrungen eine Labyrinthdichtung angeordnet.If two bleed steam quantities of different pressure are removed for heating or chemical process purposes, then in a further embodiment of the invention a full-walled, axially immovable partition wall is provided between the two annular disc pistons and is in the radial gap between the radial inner ring housing wall and connected to the low pressure spaces behind the adjustable guide vanes A labyrinth seal is arranged in the rotor shaft in the area between the bores connecting the suction chamber of each ring disk piston with the radial gap.

In der Zeichnung sind zwei Ausführungsbeispiele der erfindungsgemäßen internen Regeleinrichtung schematisch dargestellt. Es zeigt:

  • Fig. 1 die obere Hälfte eines Längsmittelschnitts durch den Einströmteil eines zweiflutigen, symmetrischen Niederdruckturbine,
  • Fig. 2 eine für zwei Dampfentnahmen verwendbare Regelein- . richtung, wobei die verstellbaren Leitschaufeln, die Verstellhebel und die Verstellringe jedoch weggelassen worden sind, und
  • Fig. 3 eine Variante einer verstellbaren Leitschaufel im Querschnitt.
In the drawing, two exemplary embodiments of the internal control device according to the invention are shown schematically. It shows:
  • 1 shows the upper half of a longitudinal central section through the inflow part of a double-flow, symmetrical low-pressure turbine,
  • Fig. 2 is a usable for two steam withdrawals. direction, however, the adjustable guide vanes, the adjusting lever and the adjusting rings have been omitted, and
  • Fig. 3 shows a variant of an adjustable guide vane in cross section.

Die Verstelleinrichtung ist größtenteils im Ringraum 1 - also einem bereits vorhandenen Raum - zwischen den beiden ersten Laufradstufen 2a, 2b einer zweiflutigen, bezüglich der Turbinenstufen symmetrischen Niederdruckturbine angeordnet. - Die Niederdruckturbine ist vorzugsweise Teil einer Heizdampf-Entnahmeturbine, wobei die Heizdampfabzapfung am Austritt des Mitteldruckteils 3 erfolgt und wobei der Dampfstrom, der nach der Entnahme in der Turbine verbleibt, über eine Überströmleitung vom Mitteldruck-Austritt dem Ringraum 1 ungedrosselt zugeführt wird.The adjusting device is largely arranged in the annular space 1 - that is, an already existing space - between the two first impeller stages 2a, 2b of a double-flow, low-pressure turbine symmetrical with respect to the turbine stages. - The low-pressure turbine is preferably part of a heating steam extraction turbine, the heating steam being drawn off at the outlet of the medium-pressure part 3 and the steam flow remaining in the turbine after removal being fed unthrottled to the annular space 1 via an overflow line from the medium-pressure outlet.

Die Verstelleinrichtung weist ein koaxial zur Rotorwelle 4 angeordnetes und diese mit Abstand (Radialspalt 5) umgebendes, im Türbineninnern liegendes Ringgehäuse auf, das einen radial äußeren Mantel 7, zwei sich senkrecht zur Rotorlängsmittelachse 8 erstrechende Ringscheiben 9 und einen radial inneren Mantel 10 umfaßt. Im Ringraum 6 des Ringgehäuses sind zwei Ringscheibenkolben 11, 12 angeordnet, die auf einer oder mehreren (vorzugsweise - zwecks Erzielen einer stabilen Führung der Ringscheibenkolben - zmehreren) koaxialen Führungsstangen 13 axial verschieblich gelagert sind. Die Ringscheibenkolben 11, 12 sind an ihren radial äußeren und radial inneren Umfangsflächen mit Dichtspitzen 14 versehen, die Labyrinthdichtungen in den Radialspalten zwischen den Ringscheibenkolben 11, 12 und den äußeren und inneren Umfangsflächen der Ringscheibenkolben bilden, wobei geringe Leckagestrome durch die Labyrinthdichtungen für die Aufrechterhaltung einer Druckdifferenz auf die Ringscheibenkolben 11, 12 sorgen. Mit den Ringscheibenkolben 11, 12 ist auf deren der Laufradstufe 2 zugewandten Seite je ein Verstellring 15 fest verbunden. Auf den Verstellringen 15 stützen sich Verstellhebel 16 ab; die anderen Enden der Verstellhebel 16 sind mit den radial inneren Enden je einer radial gerichteten Achse 17 drehstarr verbunden. Die Achsen 17 durchsetzen die zugeordnete Leitschaufel in deren Längsrichtung und sind mit der Leitschaufel oder einem Teil davon relativ zu ihr undrehbar verbunden und mit ihren radial äußeren Enden in einer Ausnehmung 19 im Einströmgehäuse 20 bzw. einem Leitschaufelträger drehbar gestützt und geführt. Die Verdrehung der Leitschaufeln 18 bzw. Leitschaufelteile erfolgt durch eine Axialverschiebung der Ringscheibenkolben 11, 12, wobei es, wie an sich bekannt, zu einer Schwenkbewegung der Verstellhebel 16, und, daraus folgend, zu einer Drehbewegung der Leitschaufeln 18 bzw. deren verschwenkbaren Teile kommt.-Es sind jedoch auch abweichende konstruktive Lösungen der mechanischen Verstellgestänge 15, 16, 17 möglich.The adjusting device has a ring housing, which is arranged coaxially to the rotor shaft 4 and surrounds it at a distance (radial gap 5) and lies in the interior of the door frame, which comprises a radially outer casing 7, two annular disks 9 which are perpendicular to the longitudinal axis 8 of the rotor and a radially inner casing 10. Arranged in the annular space 6 of the ring housing are two annular disk pistons 11, 12, which rest on one or more (preferably - for the purpose of achieving stable guidance of the annular disk pistons - several) coaxial guide rods 13 are axially displaceably mounted. The washer pistons 11, 12 are provided on their radially outer and radially inner circumferential surfaces with sealing tips 14 which form labyrinth seals in the radial gaps between the washer pistons 11, 12 and the outer and inner circumferential surfaces of the washer pistons, with low leakage flows through the labyrinth seals for the maintenance of a Ensure pressure difference on the washer pistons 11, 12. With the washer pistons 11, 12, an adjusting ring 15 is firmly connected to the side facing the impeller 2. Adjusting levers 16 are supported on the adjusting rings 15; the other ends of the adjusting levers 16 are connected in a rotationally rigid manner to the radially inner ends of each of a radially directed axis 17. The axes 17 pass through the associated guide vane in the longitudinal direction thereof and are non-rotatably connected to the guide vane or a part thereof and are supported and guided rotatably with their radially outer ends in a recess 19 in the inflow housing 20 or a guide vane carrier. The rotation of the guide vanes 18 or guide vane parts takes place by an axial displacement of the annular disc pistons 11, 12, which, as is known per se, results in a pivoting movement of the adjusting levers 16 and, consequently, in a rotary movement of the guide vanes 18 or their pivotable parts However, different constructive solutions of the mechanical adjustment rods 15, 16, 17 are also possible.

Die Axialverstellung der Ringscheibenkolben 11, 12 erfolgt durch turbineneigenen Dampf ausreichend hohen Druckes, der über eine Steuerdruckleitung 21, und Bohrungen 22 im äußeren Mantel, öder entsprechende Leitungen, in die beiden Druckräume 23a, 23b am dem entsprechenden Verstellring 15 und den Verstellhebeln 16 zugewandten Ende der Ringscheibenkolben 11, 12 geleitet wird. Der Raum (Saugraum) zwischen den inneren Ringscheibenkolben-Stirnflächen ist über eine oder mehrere Bohrungen 24,oder Ausnehmungen,im inneren Mantel mit dem Radialspalt 5, und damit - als Folge der Axialspalte 29 - mit den Räumen niedrigen Druckes hinter den Leitschaufeln 18 verbunden.The axial adjustment of the annular disc pistons 11, 12 is carried out by the steam's own steam of sufficiently high pressure, which via a control pressure line 21 and bores 22 in the outer jacket, or corresponding lines, into the two pressure chambers 23a, 23b at the end facing the corresponding adjusting ring 15 and the adjusting levers 16 the washer piston 11, 12 is passed. The space (suction space) between the inner annular disc piston end faces is connected via one or more bores 24 or recesses in the inner jacket to the radial gap 5, and thus - as a result of the axial gap 29 - to the spaces of low pressure behind the guide vanes 18.

Die Axialverschiebung der Ringscheibenkolben 11, 12 hat gegen die Summe der axialen Dampfkraftkomponenten der verstellbaren Leitschaufeln 18 zu erfolgen. Je nach der Größe der Druckfläche der Ringscheibenkolben 11, 12 muß der Druck in den Druckräumen 23a, 23b eingestellt werden, um der gesamten Axialkraft aus den axialen Dampfkraftkomponenten das Gleichgewicht zu halten. Da die Axialkraftkomponenten an den Leitschaufeln 18 stets im Öffnungssinn wirken, ist die Richtung der Druckkraft an jedem Ringscheibenkolben 11, 12 stets gleich. Um in den Druckräumen 23a, 23b jeweils den erforderlichen Druck zur Verfügung .zu haben, ist in der Steuerdruckleitung 21 außerhalb des Turbinengehäuses ein Stellventil 25 vorgesehen, das vorzugsweise mit einer Turbinenanzapfung für die regenerative Speisewasservorwärmung : höheren Drucks in Wirkverbindung steht. - Die Steuerung des Stellventils 25 erfolgt entsprechend der bekannten Steuerung der (externen) Drosselklappe in der Überströmleitung, so daß auf dieses Detail nicht näher eingegangen werden muß.The axial displacement of the annular disc pistons 11, 12 has to be carried out against the sum of the axial steam power components of the adjustable guide vanes 18. Depending on the size of the pressure surface of the annular disc pistons 11, 12, the pressure in the pressure chambers 23a, 23b must be set in order to keep the total axial force from the axial vapor force components in balance. Since the axial force components on the guide vanes 18 always act in the opening direction, the direction of the compressive force on each annular disk piston 11, 12 is always the same. In order to have the required pressure available in the pressure chambers 23a, 23b, a control valve 25 is provided in the control pressure line 21 outside the turbine housing, which is preferably operatively connected to a turbine tap for regenerative feed water preheating: higher pressure. - The control of the control valve 25 is carried out according to the known control of the (external) throttle valve in the overflow line, so that there is no need to go into this detail.

Es braucht nicht die gesamte Leitschaufel 18 verschwenkt werden. Jede Leitschaufel 18 kann aus einem feststehenden Vorderteil 18a, der Drehachse 17 und einem verstellbaren (verschwenkbaren) Teil 18b bestehen.(Figur 3). Die feststehenden Teile 18b tragen die Verstelleinrichtung und verbinden sie mit dem Einströmgehäuseteil der Niederdruckturbine. Die verstellbaren Teile 18b dienen-der Regelung des Dampfentnahmedrucks durch Veränderung des Durchflußquerschnitts der beiden ersten Leitgitter 18.The entire guide vane 18 does not need to be pivoted. Each guide vane 18 can consist of a fixed front part 18a, the axis of rotation 17 and an adjustable (pivotable) part 18b (FIG. 3). The fixed parts 18b carry the adjusting device and connect them to the inlet housing part of the low pressure turbine. The adjustable parts 18b serve to regulate the steam extraction pressure by changing the flow cross section of the two first guide grids 18.

Die Achse 17 kann,- vergleiche Fig. 1 - integraler Bestandteil des verstellbaren Teils 18b sein; sie kann aber auch - vergleiche Figur 3 - durch entsprechende Ausnehmungen der Teile 18a, 18b hindurchgesteckt und mit dem verstellbaren Teil 18b über eine bekannte Keilverbindung 26, bei der ein Drehmoment durch Reibschluß und Formschluß übertragen werden kann, verbunden sein.The axis 17 can, see FIG. 1, be an integral part of the adjustable part 18b; but it can also - see FIG. 3 - be pushed through corresponding recesses in the parts 18a, 18b and connected to the adjustable part 18b via a known wedge connection 26, in which a torque can be transmitted by frictional engagement and positive engagement.

Der axiale Verschiebeweg der Ringscheibenkolben kann durch Anschläge begrenzt werden.The axial displacement of the washer pistons can be limited by stops.

Zum sicheren Öffnen der Leitschaufeln 18 können, was nicht weiter gezeichnet ist, Druckfedern zwischen die Ringscheibenkolben 11, 12 geschaltet sein.For safe opening of the guide vanes 18, compression springs can be connected between the annular disk pistons 11, 12, which is not shown in further detail.

Die vorbeschriebene Einrichtung kann mit einfachen Maßnahmen dahingehend erweitert werden, daß zwei Entnahmedrücke für Heiz- oder Prozeßzwecke geregelt werden können (Figur 2).The device described above can be expanded with simple measures such that two extraction pressures can be regulated for heating or process purposes (FIG. 2).

Dieser Fall setzt einen hinsichtlich der Stufenzahl unsymmetrischen Niederdruckteil mit zwei getrennten Einströmbereichen voraus. Die dafür einsetzbare Verstelleinrichtung unterscheidet sich von der Verstelleinrichtung gemäß Figur 1 (nur) dadurch, daß zwischen den Ringscheibenkolben 11, 12 eine vollwandige, axial unverschiebliche Trennwand 27 vorgesehen ist, daß jeder Druckraum 23a bzw. 23b über je eine Steuerdruckleitung 21' und je ein Stellventil 25' mit der zugeordneten Steuerdampfquelle verbunden ist, daß jeder Saugraum über je eine Bohrung 24' mit dem Radialspalt 5 in Verbindung steht, und daß im Radialspalt 5 zwischen den Bohrungen 24t eine Wellendichtung (Labyrinthdichtung) mit vorzugsweise am inneren Mantel 10 befestigten Dichtspitzen 28 vorgesehen ist.This case presupposes a low-pressure part that is asymmetrical with regard to the number of stages with two separate inflow areas. The adjusting device that can be used for this differs from the adjusting device according to FIG. 1 (only) in that a full-walled, axially immovable partition wall 27 is provided between the annular disc pistons 11, 12, that each pressure chamber 23a or 23b has a control pressure line 21 'and one each Control valve 25 'is connected to the associated control steam source such that each suction chamber has a bore 24' with the radial gap 5 is connected, and that in the radial gap 5 between the bores 24 t a shaft seal (labyrinth seal) is provided with sealing tips 28 preferably attached to the inner jacket 10.

Claims (2)

1. Einrichtung zur Regelung des Entnahmedrucks einer Entnahme-Kondensationsturbine, bei der aus einer Stufe des Schaufelkanals des Mitteldruck-Teils bzw. des Hochdruck-Teils Dampf für Heizzwecke oder chemische Prozeßzwecke entnommen wird und bei der der in der Turbine verbleibende Dampf einem zweiflutigen Niederdruckteil zugeführt wird, mit schwenkbaren Schaufeln oder Schaufelteilen von stromabwärts der Dampfentnahmestelle (n) angeordneten Leitgittern, wobei die Schaufelschwenkbewegung über Verstellhebel oder -arme durch Axialverschiebung von die Verstellhebel oder -arme abstützenden Verstellringen erfolgt, dadurch gekennzeichnet, daß die Verstellringe (15) fest mit Ringscheibenkolben (11, 12) verbunden sind, die im Ringraum (6) eines koaxial zur Rotorwelle (4) angeordneten und die Rotorwelle (4) umgebenden Ringgehäuses (7, 9, 10) auf einer oder-mehreren,. koaxialen Stangen(13) oder dergleichen Führungenzaxial verschiebbar gelagert und an ihren radial äußeren und radial inneren Umfangsflächen mit Dichtspitzen (14) versehen sind, daß die Druckräume (23a, 23b) der beiden Ringscheibenkolben (11, 12) über Leitungen (21, 22) mit turbineneigenem Dampf entsprechend hohen Druckes versorgbar sind, während der bzw. jeder Saugraum über entsprechende Verbindungen (24, 5, 29) mit den Räumen niedrigen= Druckes hinter den Leitschaufeln (18) verbunden ist, und daß - abgesehen von einem Teil der Steuerdruckleitung (21), einem in der Steuerdruckleitung (21) angeordneten Stellventil (25) und dessen Stellorganbetätigung und - steuerung - die Leitschaufelverstelleinrichtungen im Ringraum (1) zwischen den beiden ersten Laufschaufelgittern (2a, 2b) des Niederdruckteils angeordnet sind.1. Device for regulating the removal pressure of a removal condensation turbine, in which steam for heating or chemical process purposes is withdrawn from a stage of the blade channel of the medium-pressure part or the high-pressure part and in which the steam remaining in the turbine is fed to a double-flow low-pressure part is, with pivotable blades or blade parts from downstream of the steam extraction point (s) arranged guide vanes, the blade pivoting movement via adjusting levers or arms by axial displacement of the adjusting lever or arms supporting adjusting rings, characterized in that the adjusting rings (15) are fixed with washer pistons ( 11, 12) are connected, which are arranged in the annular space (6) of an annular housing (7, 9, 10) coaxial to the rotor shaft (4) and surrounding the rotor shaft (4). coaxial rods (13) or similar guides are axially displaceably mounted and are provided with sealing tips (14) on their radially outer and radially inner circumferential surfaces such that the pressure spaces (23a, 23b) of the two annular disc pistons (11, 12) via lines (21, 22) are with turbinenei g enem steam correspondingly high pressure supplied, while the or each suction chamber via corresponding connections (24, 5, 29) with the low pressure chambers = is connected behind the vanes (18), and that - apart from a portion of the Control pressure line (21), a control valve (25) arranged in the control pressure line (21) and its actuating element actuation and control - the guide vane adjustment devices in the annular space (1) are arranged between the two first rotor blade grids (2a, 2b) of the low-pressure part. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zwischen den beiden Ringscheibenkolben (11, 12) eine vollwandige, axial unverschiebliche Trennwand (27) vorgesehen ist, und daß im mit den Räumen niedrigen Druckes hinter den verstellbaren Leitschaufeln (18) verbundenenRadialspalt (5) zwischen radial.innerer Ringgehäusewand (10) und Rotorwelle (4) im Bereich zwischen den den Saugraum jedes Ringscheibenkolbens (11, 12) mit dem Radialspalt verbindenden Bohrungen (241) eine Labyrinthdichtung (28) angeordnet ist.2. Device according to claim 1, characterized in that a solid, axially immovable partition (27) is provided between the two annular disc pistons (11, 12), and that in the radial gap (5) connected to the spaces behind the adjustable guide vanes (18) at low pressure ) A labyrinth seal (28) is arranged between the radial inner ring housing wall (10) and the rotor shaft (4) in the area between the bores (241) connecting the suction chamber of each ring disk piston (11, 12) with the radial gap.
EP85401457A 1984-07-26 1985-07-16 Assembly for controlling the extraction pressure of a condensation turbine Expired EP0169779B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401457T ATE37587T1 (en) 1984-07-26 1985-07-16 DEVICE FOR CONTROLLING THE EXHAUST PRESSURE OF AN EXHAUST CONDENSATION TURBINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3427528 1984-07-26
DE3427528A DE3427528C1 (en) 1984-07-26 1984-07-26 Device for regulating the extraction pressure of a extraction condensation turbine

Publications (2)

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EP0169779A1 true EP0169779A1 (en) 1986-01-29
EP0169779B1 EP0169779B1 (en) 1988-09-28

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EP85401457A Expired EP0169779B1 (en) 1984-07-26 1985-07-16 Assembly for controlling the extraction pressure of a condensation turbine

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US (1) US4634340A (en)
EP (1) EP0169779B1 (en)
JP (1) JPS6140405A (en)
AT (1) ATE37587T1 (en)
CS (1) CS274606B2 (en)
DE (2) DE3427528C1 (en)
DK (1) DK155449C (en)
FI (1) FI79384C (en)
YU (1) YU122285A (en)
ZA (1) ZA855647B (en)

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US4995786A (en) * 1989-09-28 1991-02-26 United Technologies Corporation Dual variable camber compressor stator vane
FR2681640B1 (en) * 1991-09-25 1993-11-19 Snecma VARIABLE TIMING STATOR BLADE TURBOMACHINE.
US5249918A (en) * 1991-12-31 1993-10-05 General Electric Company Apparatus and methods for minimizing or eliminating solid particle erosion in double-flow steam turbines
JP2739313B1 (en) * 1997-06-23 1998-04-15 株式会社ミナミ Weed block and weed structure of block
WO2006060000A1 (en) 2004-12-01 2006-06-08 United Technologies Corporation Variable fan inlet guide vane assembly, turbine engine with such an assembly and corresponding controlling method
US7322789B2 (en) * 2005-11-07 2008-01-29 General Electric Company Methods and apparatus for channeling steam flow to turbines
US8317458B2 (en) * 2008-02-28 2012-11-27 General Electric Company Apparatus and method for double flow turbine tub region cooling
US8096748B2 (en) * 2008-05-15 2012-01-17 General Electric Company Apparatus and method for double flow turbine first stage cooling

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US4387562A (en) * 1980-08-08 1983-06-14 Nippon Steel Corporation System for generating power with top pressure of blast furnaces

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US2412365A (en) * 1943-10-26 1946-12-10 Wright Aeronautical Corp Variable turbine nozzle
GB737472A (en) * 1952-10-03 1955-09-28 Napier & Son Ltd Turbines and like machines having adjustable guide blades
US3392958A (en) * 1966-06-03 1968-07-16 Rover Co Ltd Adjustable nozzle guide vane assembly for an axial flow turbine
DE2513581A1 (en) * 1975-03-06 1976-09-09 Bbc Brown Boveri & Cie Turbine regulating bled steam system - has adjustable stator blades downstream of bleed point for maintaining efficiency
US4387562A (en) * 1980-08-08 1983-06-14 Nippon Steel Corporation System for generating power with top pressure of blast furnaces

Also Published As

Publication number Publication date
DK155449B (en) 1989-04-10
YU122285A (en) 1988-10-31
DK339485D0 (en) 1985-07-25
ZA855647B (en) 1986-03-26
FI79384B (en) 1989-08-31
JPH0557402B2 (en) 1993-08-24
CS546285A2 (en) 1990-10-12
CS274606B2 (en) 1991-09-15
FI79384C (en) 1989-12-11
US4634340A (en) 1987-01-06
ATE37587T1 (en) 1988-10-15
FI852880A0 (en) 1985-07-24
EP0169779B1 (en) 1988-09-28
FI852880L (en) 1986-01-27
DE3565297D1 (en) 1988-11-03
DK155449C (en) 1989-10-23
JPS6140405A (en) 1986-02-26
DK339485A (en) 1986-01-27
DE3427528C1 (en) 1985-08-22

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