EP0622588A2 - Shut-off device for conduits having a large cross-section, especially for power plant exhaust and flue gas conduits - Google Patents

Shut-off device for conduits having a large cross-section, especially for power plant exhaust and flue gas conduits Download PDF

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Publication number
EP0622588A2
EP0622588A2 EP94104821A EP94104821A EP0622588A2 EP 0622588 A2 EP0622588 A2 EP 0622588A2 EP 94104821 A EP94104821 A EP 94104821A EP 94104821 A EP94104821 A EP 94104821A EP 0622588 A2 EP0622588 A2 EP 0622588A2
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EP
European Patent Office
Prior art keywords
sealing air
air duct
sections
shut
sealing
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Granted
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EP94104821A
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German (de)
French (fr)
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EP0622588B2 (en
EP0622588A3 (en
EP0622588B1 (en
Inventor
Günter Römelt
Hubert Michels
Ahmet Dipl.-Ing. Atak
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Siemens Heat Transfer Technology BV Niederlassung Deutschland
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Stober and Morlock Warmekraft GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L11/00—Arrangements of valves or dampers after the fire

Definitions

  • the invention relates to a shut-off device for ducts with large cross sections, in particular for exhaust gas and flue gas ducts of power plants, with a duct housing with a circumferential sealing air duct designed as a flap stop with sealing air blow-out openings distributed over its circumference and with a pivotably mounted shut-off flap with a double-sided peripheral seal for blowing in sealing air when the double seal is pressed against the sealing air duct in the flap closed position.
  • the invention has for its object to provide a shut-off device for channels with large cross sections, in particular for exhaust gas and flue gas channels of power plants, the embodiment described above, in which the thermal expansion of the sealing air channel are compensated in a well-defined manner.
  • the sealing air duct is divided into sealing air duct sections, that the sealing air duct sections form expansion joints between them, that the sealing air duct sections are connected to the duct housing with predetermined play in their longitudinal direction, that the expansion joints are inserted into the sealing air duct sections Inner pipe sections are bridged with a sealing effect and that the inner pipe sections are each attached to only one of the two sealing air duct sections forming the respective expansion joint.
  • Sealing air duct sections Due to the expansion joints between the Sealing air duct sections can compensate for the thermal expansions even if extreme temperature differences occur in shut-off devices with extremely large duct cross-sections or butterfly valves of up to 100 m2 and more, for example.
  • a controlled movement of the sealing air duct sections is always ensured in their longitudinal direction, so that the construction according to the invention can also be easily mastered in terms of production technology.
  • the large freedom of movement of the sealing air duct sections also results in trouble-free operation in all temperature ranges and also with rapid heating of the smoke and exhaust gases. In fact, stretches of up to 10 cm and more can easily be absorbed.
  • the invention teaches that the sealing air duct for forming the sealing air duct sections is divided into the sealing air duct corners and / or in the central region of its long and long sides by means of expansion joints and the sealing air duct corners are fixedly connected to the duct housing.
  • the sealing air duct corners therefore form the fixed points, while the thermal expansion is compensated by means of the movable sealing air duct sections.
  • Corresponding expansion joints can already be used directly to form these sealing air duct sections be realized after the sealing air duct corners. However, it is also possible to provide such expansion joints only in the area of the middle of the longitudinal and broad sides of the channel.
  • the invention further teaches that the sealing air duct sections have angled connecting flanges, that the connecting flanges have elongated holes in the longitudinal direction of the sealing air duct sections and are connected by means of fastening screws to holding flanges fastened to the duct housing, the fastening screws penetrating the holding flanges and the elongated holes of the connecting flanges being tightened to a predetermined tightening torque .
  • a screw fastening for the sealing air duct sections is realized, which is set such that the longitudinal mobility of the sealing air duct sections is not hindered in the course of the compensation of thermal expansions, nevertheless a correct fastening of the sealing air duct sections in the duct housing is ensured.
  • the sealing air duct sections are preferably composed of L-shaped and Z-shaped sealing air duct halves to form a box-shaped duct cross section and two parallel connecting flanges, the two connecting flanges with the elongated holes receiving the respective holding flange between them.
  • This embodiment of the sealing air duct sections is of particular importance because their screw fastening is also acted on by sealing air, that is to say also in the area of Fixing screws or the elongated holes in the connecting flanges and the penetrations in the holding flange prevent gas from being transferred. Otherwise, the sealing air applied for this purpose to the double seal of the butterfly valve pressed against the sealing air duct would only lead to a partially canceled and consequently reduced sealing effect.
  • the sealing effect in the area of the fastening screws is further increased by the fact that the fastening screws are inserted with washers covering the elongated holes.
  • the invention recommends that the outer cross section of the inner tube sections is adapted or corresponds to the inner cross section of the sealing air duct sections, so that on the one hand there is a play required for thermal expansion, but on the other hand a sealing effect is already achieved.
  • this sealing effect is optimized in that the expansion joints of the sealing air duct sections are bridged on the outside with metal foil tapes of a predetermined width surrounding them tightly.
  • These metal foil strips also permit longitudinal movement of the sealing air duct sections, although they nestle against the sealing air duct sections in such a way that a sealing effect against sealing air leakage is ensured.
  • the metal foil strips are expediently clamped in the area of the connecting and holding flanges by means of the fastening screws.
  • shut-off device for ducts 1 with large cross sections, in particular for exhaust gas and flue gas ducts of power plants.
  • this shut-off device has a duct housing 2 with a circumferential sealing air duct 3 designed as a flap stop with sealing air blow-out openings distributed over its circumference 4 on.
  • a pivotally mounted butterfly valve 5 is provided with a double seal 6 running around the edge for blowing in sealing air when the double seal 6 is pressed against the sealing air duct 3 in the valve closed position.
  • sealing air to the double seal 6 is intended to prevent gas from passing over when the butterfly valve 5 is in the closed position even if, contrary to expectations, the double seal 6 should not fit perfectly against the flap stop and consequently the sealing air duct 3 in all areas as a result of temperature-related deformations.
  • the sealing air duct 3 is divided into sealing air duct sections 7.
  • the sealing air duct sections 7 form expansion joints 8 between them and are connected to the duct housing 2 with a play of movement predetermined in their longitudinal direction and indicated by arrows.
  • the expansion joints 8 are bridged by inner tube sections 9 inserted into the sealing air channel sections 7 with a sealing effect.
  • the inner tube sections 9 are each secured to only one of the two sealing air duct sections 7 forming the expansion joint 8, so that the required freedom of movement of the sealing air duct sections 7 in the region of the expansion joints 8 is maintained.
  • the sealing air duct 3 is divided to form the sealing air duct sections 7 following the sealing air duct corners 10 with the formation of expansion joints.
  • the sealing air duct corners 10 are stationary with the Duct housing 2 connected.
  • the sealing air duct sections 7 have angled connecting flanges 11.
  • the connecting flanges 11 have elongated holes 12 extending in the longitudinal direction of the sealing air duct sections 7 and are connected by means of fastening screws 13 to holding flanges 14 fastened to the duct housing 2, the fastening screws 13 penetrating the holding flanges 14 and the elongated holes 12 of the connecting flanges 11 being tightened to a predetermined tightening torque in order to sufficient attachment of the sealing air duct sections 7 to allow their longitudinal mobility.
  • an inner insulation 15 is provided for the flue gas duct, in which the connection and holding flanges 11, 14 are largely embedded.
  • An external insulation (not shown) can also be implemented within the scope of the invention.
  • the fastening screws 13 are inserted with the washers 16 covering the elongated holes 12 and are also acted upon with sealing air in such a way that no gas transfer can take place in the area of the fastening screws 13 or the elongated holes 12 in the connecting flanges 11 and the penetrations in the holding flange 14.
  • the outer cross section of the inner tube sections 9 corresponds to the inner cross section of the sealing air duct sections 7. Furthermore, the expansion joints 8 are of the The sealing air duct sections 7 are bridged on the outside with metal foil tapes 17 of a predetermined width that surround them tightly. The metal foil strips 17 nestle, as it were, with a sealing effect on the outside against the sealing air duct sections 7 and are clamped in the area of the connecting and holding flanges 11, 14 by means of the fastening screws 13.
  • the sealing air duct sections are each composed of L-shaped sealing air duct halves 18 and Z-shaped sealing air duct halves 19 to form a box-shaped duct cross section and two parallel connecting flanges 11.
  • the two connecting flanges 11 take the respective holding flange 14 between them. In this way, the fastening screws 13 or elongated holes 12 in the connecting flanges 11 and penetrations in the holding flanges 14 are acted upon with sealing air, so that gas transfer is also avoided there.

Abstract

The circumferential shut-off air channel (3) designed as a flap stop in the pipe housing is divided into several channel sections (7) which form expansion joints (8) between same. These sections (7) are attached to the channel housing (2) with a predetermined motion play in the longitudinal direction. The expansion joints are bridged with sealing action by internal pipe sections (9) which are inserted in the channel sections and are each fixed on one of the two sections forming each joint (8). The channel sections can have angled connecting flanges attached by screws (13) through oblong holes onto holding flanges on the channel housing.

Description

Die Erfindung betrifft eine Absperrvorrichtung für Kanäle mit großen Querschnitten, insbesondere für Abgas- und Rauchgaskanäle von Kraftwerken, mit einem Kanalgehäuse mit einem als Klappenanschlag ausgebildeten umlaufenden Sperrluftkanal mit über seinem Umfang verteilt angeordneten Sperrluft-Ausblasöffnungen und mit einer schwenkbar gelagerten Absperrklappe mit einer randseitig umlaufenden Doppeldichtung zum Einblasen von Sperrluft bei in Klappenschließstellung gegen den Sperrluftkanal angedrückter Doppeldichtung.The invention relates to a shut-off device for ducts with large cross sections, in particular for exhaust gas and flue gas ducts of power plants, with a duct housing with a circumferential sealing air duct designed as a flap stop with sealing air blow-out openings distributed over its circumference and with a pivotably mounted shut-off flap with a double-sided peripheral seal for blowing in sealing air when the double seal is pressed against the sealing air duct in the flap closed position.

Bei derartigen Absperrvorrichtungen treten regelmäßig große Temperaturdifferenzen zwischen der Kanalinnenseite und der Kanalaußenseite auf, weil die Kanäle von verhältnismäßig heißen Rauchgasen und auch Abgasen durchströmt werden. Aus solchen Temperaturdifferenzen resultieren erhebliche Wärmedehnungen. Das gilt insbesondere für den anschlagbildenden Sperrluftkanal gegenüber dem Kanalgehäuse. Derartige Wärmedehnungen müssen folglich kompensiert werden. Aus diesem Grunde hat man bereits eine zentrale Aufhängung des rahmenartigen Sperrluftkanals versucht, und zwar unter Verwirklichung eines ortsfesten Aufhängepunktes im mittleren Bereich der oberen Kanalbreitseite sowie von rundum angeordneten Rundlöchern, um für die Befestigungselemente des Sperrluftkanals im Bereich seiner beiden Längsseiten und seiner unteren Breitseite ein hinreichendes Bewegungsspiel zur Verfügung zu stellen. Derartige Maßnahmen sind jedoch in fertigungstechnischer Hinsicht kompliziert und können insbesondere zu unkontrollierten Rahmenbewegungen führen. - Hier will die Erfindung Abhilfe schaffen.In such shut-off devices, large temperature differences regularly occur between the inside and outside of the duct, because relatively hot flue gases and also exhaust gases flow through the ducts. Such temperature differences result in significant thermal expansions. This applies in particular to the stopper-forming sealing air duct opposite the duct housing. Such thermal expansions must therefore be compensated for. For this reason, a central suspension of the frame-type sealing air duct has already been attempted, namely by realizing a fixed suspension point in the central region of the upper duct broad side and of round holes arranged all around, in order to provide sufficient fastening elements for the sealing air duct in the region of its two long sides and its lower broad side To provide motion game. However, such measures are complicated from a manufacturing point of view and can in particular lead to uncontrolled frame movements. - The invention seeks to remedy this.

Der Erfindung liegt die Aufgabe zugrunde, eine Absperrvorrichtung für Kanäle mit großen Querschnitten, insbesondere für Abgas- und Rauchgaskanäle von Kraftwerken, der eingangs beschriebenen Ausführungsform zu schaffen, bei welcher die Wärmedehnungen des Sperrluftkanals in wohldefinierter Weise kompensiert werden.The invention has for its object to provide a shut-off device for channels with large cross sections, in particular for exhaust gas and flue gas channels of power plants, the embodiment described above, in which the thermal expansion of the sealing air channel are compensated in a well-defined manner.

Diese Aufgabe löst die Erfindung bei einer gattungsgemäßen Absperrvorrichtung dadurch, daß der Sperrluftkanal in Sperrluftkanalabschnitte unterteilt ist, daß die Sperrluftkanalabschnitte Dehnungsfugen zwischen sich bilden, daß die Sperrluftkanalabschnitte mit in ihrer Längsrichtung vorgegebenem Bewegungsspiel an das Kanalgehäuse angeschlossen sind, daß die Dehnungsfugen von in die Sperrluftkanalabschnitte eingesetzten Innenrohrabschnitten mit Dichtwirkung überbrückt sind und daß die Innenrohrabschnitte jeweils an lediglich einem der beiden die jeweilige Dehnungsfuge bildenden Sperrluftkanalabschnitte befestigt sind. - Diese Maßnahmen der Erfindung haben zur Folge, daß sich die Sperrluftkanalabschnitte im Zuge der Kompensation von Wärmedehnungen stets in ihre Längsrichtung und folglich in wohldefinierter Weise ausdehnen bzw. zusammenziehen können. Aufgrund der Dehnungsfugen zwischen den Sperrluftkanalabschnitten lassen sich die Wärmedehnungen selbst dann einwandfrei kompensieren, wenn extreme Temperaturdifferenzen bei Absperrvorrichtungen mit extrem großen Kanalquerschnitten bzw. Absperrklappen von beispielsweise bis zu 100 m² und mehr auftreten. Stets ist eine kontrollierte Bewegung der Sperrluftkanalabschnitte in eben deren Längsrichtung gewährleistet, so daß sich die erfindungsgemäße Konstruktion auch in fertigungstechnischer Hinsicht ohne weiteres beherrschen läßt. Aus der großen Bewegungsfreiheit der Sperrluftkanalabschnitte resultiert zugleich ein störungsfreier Betrieb in sämtlichen Temperaturbereichen und ebenso bei einer schnellen Aufheizung der Rauch- bzw. Abgase. Tatsächlich lassen sich Dehnungen selbst bis zu 10 cm und mehr unschwer aufnehmen.This problem is solved by the invention in a generic shut-off device in that the sealing air duct is divided into sealing air duct sections, that the sealing air duct sections form expansion joints between them, that the sealing air duct sections are connected to the duct housing with predetermined play in their longitudinal direction, that the expansion joints are inserted into the sealing air duct sections Inner pipe sections are bridged with a sealing effect and that the inner pipe sections are each attached to only one of the two sealing air duct sections forming the respective expansion joint. - These measures of the invention have the consequence that the sealing air duct sections can always expand or contract in their longitudinal direction and consequently in a well-defined manner in the course of the compensation of thermal expansions. Due to the expansion joints between the Sealing air duct sections can compensate for the thermal expansions even if extreme temperature differences occur in shut-off devices with extremely large duct cross-sections or butterfly valves of up to 100 m² and more, for example. A controlled movement of the sealing air duct sections is always ensured in their longitudinal direction, so that the construction according to the invention can also be easily mastered in terms of production technology. The large freedom of movement of the sealing air duct sections also results in trouble-free operation in all temperature ranges and also with rapid heating of the smoke and exhaust gases. In fact, stretches of up to 10 cm and more can easily be absorbed.

Weitere erfindungswesentliche Merkmale sind im folgenden aufgeführt. So lehrt die Erfindung, daß der Sperrluftkanal zur Bildung der Sperrluftkanalabschnitte im Anschluß an die Sperrluftkanalecken und/oder im mittleren Bereich seiner Längs- und Breitseiten mittels Dehnungsfugen unterteilt ist und die Sperrluftkanalecken ortsfest mit dem Kanalgehäuse verbunden sind. Die Sperrluftkanalecken bilden folglich die Fixpunkte, während die Kompensation der Wärmedehnungen mittels der beweglichen Sperrluftkanalabschnitte erfolgt. Zur Bildung dieser Sperrluftkanalabschnitte können entsprechende Dehnungsfugen bereits unmittelbar im Anschluß an die Sperrluftkanalecken verwirklicht werden. Es besteht aber auch die Möglichkeit, lediglich im Bereich der Mitte der Kanallängs- und breitseiten solche Dehnungsfugen vorzusehen. Weiter lehrt die Erfindung, daß die Sperrluftkanalabschnitte abgewinkelte Anschlußflansche aufweisen, daß die Anschlußflansche in Längsrichtung der Sperrluftkanalabschnitte verlaufende Langlöcher aufweisen und mittels Befestigungsschrauben an am Kanalgehäuse befestigte Halteflansche angeschlossen sind, wobei die die Halteflansche und die Langlöcher der Anschlußflansche durchdringenden Befestigungsschrauben mit einem vorgegebenen Anzugsmoment angezogen sind. Im Rahmen der Erfindung wird also eine Schraubbefestigung für die Sperrluftkanalabschnitte verwirklicht, die so eingestellt ist, daß die Längsbeweglichkeit der Sperrluftkanalabschnitte im Zuge der Kompensation von Wärmedehnungen nicht behindert wird, dennoch eine einwandfreie Befestigung der Sperrluftkanalabschnitte im Kanalgehäuse gewährleistet ist. Aus fertigungstechnischen Gründen sind die Sperrluftkanalabschnitte vorzugsweise aus L-förmigen und Z-förmigen Sperrluftkanalhälften unter Bildung eines kastenförmigen Kanalquerschnitts und zwei parallele Anschlußflansche zusammengesetzt, wobei die beiden Anschlußflansche mit den Langlöchern den jeweiligen Halteflansch zwischen sich aufnehmen. Dieser Ausführungsform der Sperrluftkanalabschnitte kommt deshalb besondere Bedeutung zu, weil auch ihre Schraubbefestigung mit Sperrluft beaufschlagt wird, also auch im Bereich der Befestigungsschrauben bzw. der Langlöcher in den Anschlußflanschen und der Durchdringungen im Halteflansch ein Gasübertritt verhindert wird. Denn anders würde die zu diesem Zweck erfolgende Sperrluftbeaufschlagung der an den Sperrluftkanal angedrückten Doppeldichtung der Absperrklappe lediglich zu einer teilweise wieder aufgehobenen und folglich reduzierten Dichtwirkung führen. Die Dichtwirkung im Bereich der Befestigungsschrauben wird dadurch noch erhöht, daß die Befestigungsschrauben mit die Langlöcher abdeckenden Unterlegscheiben eingesetzt sind.Further features essential to the invention are listed below. Thus, the invention teaches that the sealing air duct for forming the sealing air duct sections is divided into the sealing air duct corners and / or in the central region of its long and long sides by means of expansion joints and the sealing air duct corners are fixedly connected to the duct housing. The sealing air duct corners therefore form the fixed points, while the thermal expansion is compensated by means of the movable sealing air duct sections. Corresponding expansion joints can already be used directly to form these sealing air duct sections be realized after the sealing air duct corners. However, it is also possible to provide such expansion joints only in the area of the middle of the longitudinal and broad sides of the channel. The invention further teaches that the sealing air duct sections have angled connecting flanges, that the connecting flanges have elongated holes in the longitudinal direction of the sealing air duct sections and are connected by means of fastening screws to holding flanges fastened to the duct housing, the fastening screws penetrating the holding flanges and the elongated holes of the connecting flanges being tightened to a predetermined tightening torque . In the context of the invention, therefore, a screw fastening for the sealing air duct sections is realized, which is set such that the longitudinal mobility of the sealing air duct sections is not hindered in the course of the compensation of thermal expansions, nevertheless a correct fastening of the sealing air duct sections in the duct housing is ensured. For technical reasons, the sealing air duct sections are preferably composed of L-shaped and Z-shaped sealing air duct halves to form a box-shaped duct cross section and two parallel connecting flanges, the two connecting flanges with the elongated holes receiving the respective holding flange between them. This embodiment of the sealing air duct sections is of particular importance because their screw fastening is also acted on by sealing air, that is to say also in the area of Fixing screws or the elongated holes in the connecting flanges and the penetrations in the holding flange prevent gas from being transferred. Otherwise, the sealing air applied for this purpose to the double seal of the butterfly valve pressed against the sealing air duct would only lead to a partially canceled and consequently reduced sealing effect. The sealing effect in the area of the fastening screws is further increased by the fact that the fastening screws are inserted with washers covering the elongated holes.

Außerdem empfiehlt die Erfindung, daß der Außenquerschnitt der Innenrohrabschnitte dem Innenquerschnitt der Sperrluftkanalabschnitte angepaßt ist bzw. entspricht, so daß einerseits ein für die Wärmedehnungen erforderliches Bewegungsspiel gegeben ist, andererseits jedoch bereits Dichtwirkung erreicht wird. Nach einem Vorschlag der Erfindung mit selbständiger Bedeutung wird diese Dichtwirkung dadurch optimiert, daß die Dehnungsfugen von die Sperrluftkanalabschnitte außenseitig mit dichter Anlage umgebenden Metallfolienbändern vorgegebener Breite überbrückt sind. Auch diese Metallfolienbänder lassen eine Längsbewegung der Sperrluftkanalabschnitte zu, obwohl sie sich derart an die Sperrluftkanalabschnitte anschmiegen, daß Dichtwirkung gegen Sperrluftaustritt gewährleistet ist. Zweckmäßigerweise sind die Metallfolienbänder im Bereich der Anschluß- und Halteflansche mittels der Befestigungsschrauben eingespannt.In addition, the invention recommends that the outer cross section of the inner tube sections is adapted or corresponds to the inner cross section of the sealing air duct sections, so that on the one hand there is a play required for thermal expansion, but on the other hand a sealing effect is already achieved. According to a proposal of the invention of independent importance, this sealing effect is optimized in that the expansion joints of the sealing air duct sections are bridged on the outside with metal foil tapes of a predetermined width surrounding them tightly. These metal foil strips also permit longitudinal movement of the sealing air duct sections, although they nestle against the sealing air duct sections in such a way that a sealing effect against sealing air leakage is ensured. The metal foil strips are expediently clamped in the area of the connecting and holding flanges by means of the fastening screws.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert; es zeigen:

Fig. 1
eine erfindungsgemäße Absperrvorrichtung in schematischer Frontansicht,
Fig. 2
den Gegenstand nach Fig. 1 in Ansicht X auf den Sperrluftkanal,
Fig. 3
einen vergrößerten Ausschnitt Y aus dem Gegenstand nach Fig. 2 im Bereich einer Sperrluftkanalecke,
Fig. 4
einen Schnitt A-A durch den Gegenstand nach Fig. 3,
Fig. 5
einen Schnitt B-B durch den Gegenstand nach Fig. 3 mit angedeuteter Innenisolierung und
Fig. 6
einen Schnitt C-C durch den Gegenstand nach Fig. 3 mit ebenfalls angedeuteter Innenisolierung.
In the following, the invention is explained in more detail with reference to a drawing showing only one embodiment; show it:
Fig. 1
a shut-off device according to the invention in a schematic front view,
Fig. 2
1 in view X of the sealing air duct,
Fig. 3
3 shows an enlarged section Y from the object according to FIG. 2 in the area of a sealing air duct corner,
Fig. 4
3 shows a section AA through the object according to FIG. 3,
Fig. 5
a section BB through the object of FIG. 3 with indicated internal insulation and
Fig. 6
a section CC through the object of FIG. 3 with also indicated internal insulation.

In den Figuren ist eine Absperrvorrichtung für Kanäle 1 mit großen Querschnitten, insbesondere für Abgas- und Rauchgaskanäle von Kraftwerken dargestellt. Diese Absperrvorrichtung weist in ihrem grundsätzlichen Aufbau ein Kanalgehäuse 2 mit einem als Klappenanschlag ausgebildeten umlaufenden Sperrluftkanal 3 mit über seinem Umfang verteilt angeordneten Sperrluft-Ausblasöffnungen 4 auf. Ferner ist eine schwenkbar gelagerte Absperrklappe 5 mit einer randseitig umlaufenden Doppeldichtung 6 zum Einblasen von Sperrluft bei in Klappenschließstellung gegen den Sperrluftkanal 3 angedrückter Doppeldichtung 6 vorgesehen. Die Beaufschlagung der Doppeldichtung 6 mit Sperrluft soll einen Gasübertritt bei in Schließstellung befindlicher Absperrklappe 5 mit Sicherheit selbst dann verhindern, wenn die Doppeldichtung 6 wider Erwarten nicht in sämtlichen Bereichen infolge temperaturbedingter Verformungen einwandfrei gegen den Klappenanschlag und folglich Sperrluftkanal 3 anliegen sollte.The figures show a shut-off device for ducts 1 with large cross sections, in particular for exhaust gas and flue gas ducts of power plants. In its basic construction, this shut-off device has a duct housing 2 with a circumferential sealing air duct 3 designed as a flap stop with sealing air blow-out openings distributed over its circumference 4 on. Furthermore, a pivotally mounted butterfly valve 5 is provided with a double seal 6 running around the edge for blowing in sealing air when the double seal 6 is pressed against the sealing air duct 3 in the valve closed position. The application of sealing air to the double seal 6 is intended to prevent gas from passing over when the butterfly valve 5 is in the closed position even if, contrary to expectations, the double seal 6 should not fit perfectly against the flap stop and consequently the sealing air duct 3 in all areas as a result of temperature-related deformations.

Der Sperrluftkanal 3 ist in Sperrluftkanalabschnitte 7 unterteilt. Die Sperrluftkanalabschnitte 7 bilden zwischen sich Dehnungsfugen 8 und sind mit in ihrer Längsrichtung vorgegebenem und durch Pfeile angedeuteten Bewegungsspiel an das Kanalgehäuse 2 angeschlossen. Die Dehnungsfugen 8 sind von in die Sperrluftkanalabschnitte 7 eingesetzten Innenrohrabschnitten 9 mit Dichtwirkung überbrückt. Die Innenrohrabschnitte 9 sind jeweils nur an einem der beiden die betreffende Dehnungsfuge 8 bildenden Sperrluftkanalabschnitte 7 befestigt, so daß die erforderliche Bewegungsfreiheit der Sperrluftkanalabschnitte 7 im Bereich der Dehnungsfugen 8 erhalten bleibt. Der Sperrluftkanal 3 ist zur Bildung der Sperrluftkanalabschnitte 7 im Anschluß an die Sperrluftkanalecken 10 unter Dehnfugenbildung unterteilt. Die Sperrluftkanalecken 10 sind ortsfest mit dem Kanalgehäuse 2 verbunden. Weitere nicht gezeigte Dehnfugen können über die Länge der Kanalbreitseiten und Kanallängsseiten verwirklicht sein. Die Sperrluftkanalabschnitte 7 weisen abgewinkelte Anschlußflansche 11 auf. Die Anschlußflansche 11 besitzen in Längsrichtung der Sperrluftkanalabschnitte 7 verlaufende Langlöcher 12 und sind mittels Befestigungsschrauben 13 an am Kanalgehäuse 2 befestigte Halteflansche 14 angeschlossen, wobei die die Halteflansche 14 und die Langlöcher 12 der Anschlußflansche 11 durchdringenden Befestigungsschrauben 13 mit einem vorgegebenen Anzugsmoment angezogen sind, um bei hinreichender Befestigung der Sperrluftkanalabschnitte 7 deren Längsbeweglichkeit dennoch zuzulassen. Nach dem Ausführungsbeispiel ist eine Innenisolierung 15 für den Rauchgaskanal vorgesehen, in welche die Anschluß- und Halteflansche 11, 14 weitgehend eingebettet sind. Im Rahmen der Erfindung kann auch eine nicht gezeigte Außenisolierung verwirklicht sein. - Die Befestigungsschrauben 13 sind mit die Langlöcher 12 abdeckenden Unterlegscheiben 16 eingesetzt und werden ebenfalls mit Sperrluft derart beaufschlagt, daß auch im Bereich der Befestigungsschrauben 13 bzw. der Langlöcher 12 in den Anschlußflanschen 11 und der Durchdringungen im Halteflansch 14 kein Gasübertritt erfolgen kann.The sealing air duct 3 is divided into sealing air duct sections 7. The sealing air duct sections 7 form expansion joints 8 between them and are connected to the duct housing 2 with a play of movement predetermined in their longitudinal direction and indicated by arrows. The expansion joints 8 are bridged by inner tube sections 9 inserted into the sealing air channel sections 7 with a sealing effect. The inner tube sections 9 are each secured to only one of the two sealing air duct sections 7 forming the expansion joint 8, so that the required freedom of movement of the sealing air duct sections 7 in the region of the expansion joints 8 is maintained. The sealing air duct 3 is divided to form the sealing air duct sections 7 following the sealing air duct corners 10 with the formation of expansion joints. The sealing air duct corners 10 are stationary with the Duct housing 2 connected. Further expansion joints, not shown, can be realized over the length of the broad and long sides of the duct. The sealing air duct sections 7 have angled connecting flanges 11. The connecting flanges 11 have elongated holes 12 extending in the longitudinal direction of the sealing air duct sections 7 and are connected by means of fastening screws 13 to holding flanges 14 fastened to the duct housing 2, the fastening screws 13 penetrating the holding flanges 14 and the elongated holes 12 of the connecting flanges 11 being tightened to a predetermined tightening torque in order to sufficient attachment of the sealing air duct sections 7 to allow their longitudinal mobility. According to the embodiment, an inner insulation 15 is provided for the flue gas duct, in which the connection and holding flanges 11, 14 are largely embedded. An external insulation (not shown) can also be implemented within the scope of the invention. - The fastening screws 13 are inserted with the washers 16 covering the elongated holes 12 and are also acted upon with sealing air in such a way that no gas transfer can take place in the area of the fastening screws 13 or the elongated holes 12 in the connecting flanges 11 and the penetrations in the holding flange 14.

Der Außenquerschnitt der Innenrohrabschnitte 9 entspricht dem Innenquerschnitt der Sperrluftkanalabschnitte 7. Ferner sind die Dehnungsfugen 8 von die Sperrluftkanalabschnitte 7 außenseitig mit dichter Anlage umgebenden Metallfolienbändern 17 vorgegebener Breite überbrückt. Die Metallfolienbänder 17 schmiegen sich gleichsam und mit Dichtwirkung außenseitig gegen die Sperrluftkanalabschnitte 7 an und sind im Bereich der Anschluß- und Halteflansche 11, 14 mittels der Befestigungsschrauben 13 eingespannt.The outer cross section of the inner tube sections 9 corresponds to the inner cross section of the sealing air duct sections 7. Furthermore, the expansion joints 8 are of the The sealing air duct sections 7 are bridged on the outside with metal foil tapes 17 of a predetermined width that surround them tightly. The metal foil strips 17 nestle, as it were, with a sealing effect on the outside against the sealing air duct sections 7 and are clamped in the area of the connecting and holding flanges 11, 14 by means of the fastening screws 13.

Nach dem Ausführungsbeispiel sind die Sperrluftkanalabschnitte jeweils aus L-förmigen Sperrluftkanalhälften 18 und Z-förmigen Sperrluftkanalhälften 19 unter Bildung eines kastenförmigen Kanalquerschnitts und zwei paralleler Anschlußflansche 11 zusammengesetzt. Die beiden Anschlußflansche 11 nehmen den jeweiligen Halteflansch 14 zwischen sich auf. Auf diese Weise werden auch die Befestigungsschrauben 13 bzw. Langlöcher 12 in den Anschlußflanschen 11 und Durchdringungen in den Halteflanschen 14 mit Sperrluft beaufschlagt, so daß auch dort ein Gasübertritt vermieden wird.According to the exemplary embodiment, the sealing air duct sections are each composed of L-shaped sealing air duct halves 18 and Z-shaped sealing air duct halves 19 to form a box-shaped duct cross section and two parallel connecting flanges 11. The two connecting flanges 11 take the respective holding flange 14 between them. In this way, the fastening screws 13 or elongated holes 12 in the connecting flanges 11 and penetrations in the holding flanges 14 are acted upon with sealing air, so that gas transfer is also avoided there.

Claims (8)

Absperrvorrichtung für Kanäle mit großen Querschnitten, insbesondere für Abgas- und Rauchgaskanäle von Kraftwerken, mit einem Kanalgehäuse mit einem als Klappenanschlag ausgebildeten umlaufenden Sperrluftkanal mit über seinem Umfang verteilt angeordneten Sperrluft-Ausblasöffnungen und mit einer schwenkbar gelagerten Absperrklappe mit einer randseitig umlaufenden Doppeldichtung zum Einblasen von Sperrluft bei in Klappenschließstellung gegen den Sperrluftkanal angedrückter Doppeldichtung, dadurch gekennzeichnet, daß der Sperrluftkanal (3) in Sperrluftkanalabschnitte (7) unterteilt ist, daß die Sperrluftkanalabschnitte (7) Dehnungsfugen (8) zwischen sich bilden, daß die Sperrluftkanalabschnitte (7) mit in ihrer Längsrichtung vorgegebenem Bewegungsspiel an das Kanalgehäuse (2) angeschlossen sind, daß die Dehnungsfugen (8) von in die Sperrluftkanalabschnitte (7) eingesetzten Innenrohrabschnitten (9) mit Dichtwirkung überbrückt sind und daß die Innenrohrabschnitte (9) jeweils an einem der beiden die jeweilige Dehnungsfuge (8) bildenden Sperrluftkanalabschnitte (7) befestigt sind.Shut-off device for ducts with large cross-sections, in particular for exhaust gas and flue gas ducts of power plants, with a duct housing with a circumferential sealing air duct designed as a flap stop with sealing air discharge openings distributed over its circumference and with a pivotably mounted butterfly valve with a double-sided circumferential seal for blowing in sealing air When the double seal is pressed against the sealing air duct in the flap closed position, characterized in that the sealing air duct (3) is divided into sealing air duct sections (7), that the sealing air duct sections (7) form expansion joints (8) between them so that the sealing air duct sections (7) are in their longitudinal direction predetermined movement play are connected to the duct housing (2) that the expansion joints (8) of the inner pipe sections (9) inserted into the sealing air duct sections (7) are bridged with a sealing effect and that the inner pipe sections (9) are each ils are attached to one of the two sealing air duct sections (7) forming the respective expansion joint (8). Absperrvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Sperrluftkanal (3) zur Bildung der Sperrluftkanalabschnitte (7) im Anschluß an die Sperrluftkanalecken (10) und/oder im mittleren Bereich seiner Längs- und Breitseiten unterteilt ist und die Sperrluftkanalecken (10) ortsfest mit dem Kanalgehäuse (2) verbunden sind.Shut-off device according to Claim 1, characterized in that the sealing air duct (3) for forming the sealing air duct sections (7) is subdivided following the sealing air duct corners (10) and / or in the central region of its long and short sides and the The sealing air duct corners (10) are fixed to the duct housing (2). Absperrvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Sperrluftkanalabschnitte (7) abgewinkelte Anschlußflansche (11) aufweisen, daß die Anschlußflansche (11) in Längsrichtung der Sperrluftkanalabschnitte (7) verlaufende Langlöcher (12) aufweisen und mittels Befestigungsschrauben (13) an am Kanalgehäuse (2) befestigte Halteflansche (14) angeschlossen sind, wobei die die Halteflansche (14) und die Langlöcher (12) der Anschlußflansche (11) durchdringenden Befestigungsschrauben (13) mit einem vorgegebenen Anzugsmoment angezogen sind.Shut-off device according to claim 1 or 2, characterized in that the sealing air duct sections (7) have angled connecting flanges (11), that the connecting flanges (11) have elongated holes (12) running in the longitudinal direction of the sealing air duct sections (7) and by means of fastening screws (13) on Duct housing (2) attached holding flanges (14) are connected, the fastening screws (13) penetrating the holding flanges (14) and the elongated holes (12) of the connecting flanges (11) being tightened to a predetermined tightening torque. Absperrvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Sperrluftkanalabschnitte (7) jeweils aus L-förmigen und Z-förmigen Sperrluftkanalhälften (18, 19) unter Bildung eines kastenförmigen Kanalquerschnitts und zwei paralleler Anschlußflansche (11) zusammengesetzt sind, und daß die beiden Anschlußflansche (11) den jeweiligen Halteflansch (14) zwischen sich aufnehmen.Shut-off device according to one of claims 1 to 3, characterized in that the sealing air duct sections (7) are each composed of L-shaped and Z-shaped sealing air duct halves (18, 19) to form a box-shaped duct cross section and two parallel connecting flanges (11), and in that the two connecting flanges (11) receive the respective holding flange (14) between them. Absperrvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Befestigungsschrauben (13) mit die Langlöcher (12) abdeckenden Unterlegscheiben (16) eingesetzt sind.Shut-off device according to one of claims 1 to 4, characterized in that the fastening screws (13) with the washers (16) covering the elongated holes (12) are inserted. Absperrvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Außenquerschnitt der Innenrohrabschnitte (9) dem Innenquerschnitt der Sperrluftkanalabschnitte (7) angepaßt ist.Shut-off device according to one of claims 1 to 5, characterized in that the outer cross section of the inner tube sections (9) is adapted to the inner cross section of the sealing air duct sections (7). Absperrvorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Dehnungsfugen (8) von die Sperrluftkanalabschnitte (7) außenseitig mit dichter Anlage umgebenden Metallfolienbändern (17) vorgegebener Breite überbrückt sind.Shut-off device according to one of Claims 1 to 6, characterized in that the expansion joints (8) are bridged on the outside by metal foil strips (17) of a predetermined width surrounding the sealing air duct sections (7) with a tight fit. Absperrvorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Metallfolienbänder (17) im Bereich der Anschluß- und Halteflansche (11, 14) mittels der Befestigungsschrauben (13) eingespannt sind.Shut-off device according to one of claims 1 to 7, characterized in that the metal foil strips (17) are clamped in the area of the connecting and holding flanges (11, 14) by means of the fastening screws (13).
EP94104821A 1993-04-28 1994-03-26 Shut-off device for conduits having a large cross-section, especially for power plant exhaust and flue gas conduits Expired - Lifetime EP0622588B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4313894 1993-04-28
DE4313894A DE4313894C1 (en) 1993-04-28 1993-04-28 Cut-off apparatus for ducts of large cross-sections, in particular for exhaust gas and smoke gas ducts of power stations

Publications (4)

Publication Number Publication Date
EP0622588A2 true EP0622588A2 (en) 1994-11-02
EP0622588A3 EP0622588A3 (en) 1995-04-05
EP0622588B1 EP0622588B1 (en) 1996-08-14
EP0622588B2 EP0622588B2 (en) 2000-03-08

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ID=6486584

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EP94104821A Expired - Lifetime EP0622588B2 (en) 1993-04-28 1994-03-26 Shut-off device for conduits having a large cross-section, especially for power plant exhaust and flue gas conduits

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EP (1) EP0622588B2 (en)
AT (1) ATE141400T1 (en)
DE (1) DE4313894C1 (en)

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AT514432B1 (en) * 2013-05-22 2015-01-15 Compact Power Plant Products Gmbh diverter

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DE19608567C1 (en) * 1996-03-06 1997-10-09 Dampers Engineering Gmbh Stop-valve for gas passage heat-insulated from surroundings
DE19627062C2 (en) * 1996-07-05 2001-07-05 Audi Ag Connection between a plastic part and a metallic support
DE19906174C1 (en) * 1999-02-05 2000-05-18 Mannesmann Ag Seal for valve flaps in motor vehicle exhaust duct has polygonal seals with sliding steel sections reinforcing corners of polygonal section

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FR2304838A1 (en) * 1975-03-17 1976-10-15 Exxon Research Engineering Co VALVE
US4527773A (en) * 1982-03-12 1985-07-09 Hermann Rappold & Co. Gbmh Shut-off valve with a seal formed from an elastic strip
DE8314781U1 (en) * 1983-05-19 1985-08-29 Stober + Morlock Wärmekraft GmbH, 4350 Recklinghausen Flap valve
EP0340430A2 (en) * 1988-05-05 1989-11-08 MANNESMANN Aktiengesellschaft Sealing device
EP0478100A2 (en) * 1990-09-27 1992-04-01 MANNESMANN Aktiengesellschaft Shut-off device for a gas duct

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DE8232883U1 (en) * 1982-11-24 1984-03-22 Hermann Rappold & Co GmbH, 5160 Düren FLAP VALVE WITH A GASKET OF BENDING ELASTIC SEALING STRIP

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FR2304838A1 (en) * 1975-03-17 1976-10-15 Exxon Research Engineering Co VALVE
US4527773A (en) * 1982-03-12 1985-07-09 Hermann Rappold & Co. Gbmh Shut-off valve with a seal formed from an elastic strip
DE8314781U1 (en) * 1983-05-19 1985-08-29 Stober + Morlock Wärmekraft GmbH, 4350 Recklinghausen Flap valve
EP0340430A2 (en) * 1988-05-05 1989-11-08 MANNESMANN Aktiengesellschaft Sealing device
EP0478100A2 (en) * 1990-09-27 1992-04-01 MANNESMANN Aktiengesellschaft Shut-off device for a gas duct

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514432B1 (en) * 2013-05-22 2015-01-15 Compact Power Plant Products Gmbh diverter
AT514432A4 (en) * 2013-05-22 2015-01-15 Compact Power Plant Products Gmbh diverter

Also Published As

Publication number Publication date
EP0622588B2 (en) 2000-03-08
EP0622588A3 (en) 1995-04-05
ATE141400T1 (en) 1996-08-15
DE4313894C1 (en) 1994-08-18
EP0622588B1 (en) 1996-08-14

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