EP2612072B1 - Line having a safety system - Google Patents

Line having a safety system Download PDF

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Publication number
EP2612072B1
EP2612072B1 EP11748350.3A EP11748350A EP2612072B1 EP 2612072 B1 EP2612072 B1 EP 2612072B1 EP 11748350 A EP11748350 A EP 11748350A EP 2612072 B1 EP2612072 B1 EP 2612072B1
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EP
European Patent Office
Prior art keywords
inner tube
outer tube
line
tube
flow
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP11748350.3A
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German (de)
French (fr)
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EP2612072A1 (en
Inventor
Henning Almstedt
Edwin Gobrecht
Lars Homeier
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Siemens AG
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Siemens AG
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Priority to EP11748350.3A priority Critical patent/EP2612072B1/en
Publication of EP2612072A1 publication Critical patent/EP2612072A1/en
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Publication of EP2612072B1 publication Critical patent/EP2612072B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G5/00—Controlling superheat temperature
    • F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays

Definitions

  • the invention relates to a conduit comprising an inner tube and an outer tube arranged around the inner tube, wherein the outer tube gas-tightly encases the inner tube, wherein a gap between the inner and the outer tube is formed.
  • Such a line is eg in document FR 1 041 891 A disclosed.
  • pipelines In power plants, for example, pipelines are used, which usually have the task to transport a flow medium safely and without loss of leakage.
  • the pipes In addition to the simple transport task, the pipes must be designed mechanically under high thermal stress. However, reliable statements about the lifetime can be difficult if sufficient knowledge about the expected operation is not available.
  • Pipelines subject to repeated temperature cycles are particularly heavily loaded. Such temperature cycles are possible in high-transient operation. Especially in these highly transient contaminated areas, the pipes must be secured against failure. Damage to the pipe wall as a result of repeated temperature changes must be ensured.
  • Driving steam coolers are used for steam cooling, when conventional injection coolers do not work or only insufficiently due to difficult operating parameters.
  • Drift steam coolers typically include a two-fluid nozzle in which the atomizer steam exits the nozzle orifice at critical velocity and atomizes the injected cooling water into microfine droplets. This allows the pipeline to be cooled locally.
  • a so-called heat shield in the inner tube so that the thermal load on the pipe wall is reduced.
  • the shield is a mechanical component or a cone-shaped steam jet, which envelops the central motive steam in a cone shape. This shield prevents the contact of the water droplets with the pipe wall. This reduces thermal shock and material fatigue of the pipe wall.
  • a conduit comprising an inner tube and disposed around the inner tube outer tube, wherein the outer tube gas-tightly encases the inner tube, wherein a gap between the inner and the outer tube is formed, wherein a suction device for sucking Flow medium is arranged such that located in the intermediate space flow medium can be sucked, wherein the suction device comprises a detection device which detects a flow of the flow medium.
  • a detection device such as a flow meter, a signal may be sent indicating damage.
  • the invention is based on the aspect that damage in the line can be detected early according to the invention.
  • flow medium may enter the gap.
  • the suction device which is designed to suck off the flow medium, sucks off the flow medium.
  • a clearly identifiable physical quantity can be determined in order to detect a damage in the pipe, in particular in the inner pipe.
  • the flow medium contained in the suction device must be detected by suitable means, so that a damage is finally detected.
  • a flow meter or a temperature sensor can be arranged in the suction device. An increase in temperature leads to the conclusion that there is a leak in the inner tube. Likewise, increased flow also leads to the possible conclusion that there is damage in the inner tube.
  • the suction device is developed in such a way that it comprises a pipeline which projects into the intermediate space.
  • a comparatively simple means is provided remove the flow medium located in the intermediate space.
  • the pipe only has to be connected to a device with which it is possible to produce a different pressure, in particular a lower pressure than in the intermediate space and to absorb the flow medium.
  • the detection device has a thermocouple.
  • a damage to a thermocouple can be detected, since a flow medium located in the suction device generally has a higher temperature. By increasing the temperature detected by the thermocouple, it can also be concluded that damage has occurred in the inner tube.
  • the line comprises a capacitor, wherein the suction device is fluidically connected to the capacitor.
  • a closed steam cycle is available. This means that water is converted to steam at one point, which condenses back to water in the condenser.
  • the pressure is very low.
  • the suction device is fluidically connected to the condenser, a pressure gradient arises from the intermediate space to the condenser. An in-space flow medium can thus flow directly to the condenser. This flow can be detected by a flow meter. As already mentioned, this flow can also be detected by a temperature increase.
  • the outer tube is formed thinner than the inner tube.
  • a thermally loaded point of the conduit is formed as an elastically closed container according to the invention thus with a thin-walled tube, formed around the inner tube.
  • This area can be, for example, in the area of a weld seam or downstream in the area of a mixing section a motive steam cooler.
  • the different thermal expansions of the inner tube and the outer tube lead to a tension that can be compensated by the thin-walled, outer tube.
  • the outer tube is therefore designed to withstand the rigors. Therefore, the outer tube is formed thinner than the inner tube. Since only slight leaks are to be detected, the outer tube need not be designed against the full live steam pressure, which allows a thin-walled and thus elastic construction. Due to the thin-walled design, a design against dents may be necessary if vacuum loads occur.
  • the gap is as gas-tight as possible
  • the inner tube is welded to the outer tube in a further advantageous development.
  • the line comprises a motive steam cooler, which protrudes through the outer tube and the inner tube and is guided gas-tight. This means that the motive steam cooler is guided vapor-tight through the inner tube and the outer tube.
  • the FIG. 1 shows a line 1 in cross section.
  • the conduit 1 comprises an inner tube 2 and an outer tube 3.
  • the conduit 1 is suitable for a steam guide of comparatively hot steam (> 600 ° C).
  • the outer tube 3 is gas-tightly arranged on the inner tube 2.
  • the outer tube 3 has a weld 4, which is formed in the circumferential direction with respect to a rotation axis 5. Between the outer tube 3 and the inner tube 2, a gap 6 is formed.
  • the line 1 is formed with the outer tube 3, especially at the points which are subjected to high thermal loads.
  • the outer tube 3 is thin-walled with respect to the inner tube 2. This means that the wall of the outer tube 3 is made thinner relative to the inner tube 2.
  • the inner tube 2 and outer tube 3 are made of a steel.
  • the wall thickness of the outer tube 3 is between 10% and 80% of the thickness of the inner tube 2.
  • the thickness of the outer tube 3 can also assume the following ranges: 20% - 70%, 20% - 60%, 20% -
  • the wall thickness of the outer tube 3 is therefore designed to be thinner-walled with respect to the inner tube 2, so that the different thermal expansions of the inner tube 2 and the outer tube 3 during operation lead to stresses that can be compensated by the thin-walled, outer tube 3.
  • additional flexible elements must be taken into account (eg bellows-like constructions.) If a leak should occur, the leak will cause a flow into the intermediate space 6, which will be detected by a suction device 7
  • the suction device 7 is designed as a pipeline 8 which protrudes into the intermediate space 6.
  • This pipeline 8 is fluidically connected to a condenser not shown in detail, which means that the low pressure in the condenser causes a flow from the flow medium in the intermediate space, in which a greater pressure prevails than in the condenser, can be dissipated.
  • the outer tube 3 encloses the inner tube gas-tight.
  • the suction device 7 is designed for the extraction of flow medium, which is located in the intermediate space 6.
  • the suction device 7 comprises a detection device, which is not shown in detail, which detects a flow of the medium.
  • a flow meter can be arranged in the pipeline 8, which is a short-term increase the flow in the pipe 8 can detect as a leak in the inner tube 2.
  • thermocouple 9 can be arranged in the pipe 8. A sudden increase in the temperature detected by the thermocouple 9 leads to the conclusion that a leak has occurred in the inner tube 2.
  • the inner tube 2 is subjected to a particularly high transient load. This means that changing temperature cycles occur at this point.
  • the conduit 1 is formed with a motive steam cooler 10, which is arranged gas-tight or vapor-tight through the inner tube 2 and the outer tube 3. Particularly in the region of a motive steam cooler 10, the inner tube 2 is subjected to a high thermal load.
  • the motive steam cooler 10 an atomizing steam will emerge from the nozzle orifice at a critical velocity and the cooling water injected in the direction of rotation axis 5 will be atomized into microfine droplets.
  • FIG. 2 shows the line 1 in a cross-sectional view (seen in the direction of the axis of rotation 5).
  • the gap 6 is, as in the FIG. 2 clearly seen, a gas or vapor-tight executed space in which a leak occurring in the inner tube 2 can be detected and detected.
  • the suction device 7 is not shown in detail.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Pipeline Systems (AREA)
  • Examining Or Testing Airtightness (AREA)

Description

Die Erfindung betrifft eine Leitung umfassend ein inneres Rohr sowie ein um das innere Rohr angeordnetes äußeres Rohr, wobei das äußere Rohr das innere Rohr gasdicht ummantelt, wobei ein Zwischenraum zwischen dem inneren und dem äußeren Rohr gebildet ist.The invention relates to a conduit comprising an inner tube and an outer tube arranged around the inner tube, wherein the outer tube gas-tightly encases the inner tube, wherein a gap between the inner and the outer tube is formed.

Eine solche Leitung ist z.B. in Dokument FR 1 041 891 A offenbart.Such a line is eg in document FR 1 041 891 A disclosed.

In Kraftwerksanlagen werden beispielsweise Rohrleitungen verwendet, die in der Regel die Aufgabe haben, ein Strömungsmedium sicher und ohne Leckageverlust zu transportieren. Neben der einfachen Transportaufgabe müssen die Rohrleitungen unter hohen thermischen Beanspruchungen mechanisch ausgelegt werden. Allerdings können verlässliche Aussagen zur Lebensdauer schwierig werden, wenn ausreichende Kenntnisse über den zu erwartenden Betrieb nicht zur Verfügung stehen. Besonders stark belastet sind Rohrleitungen, die mehrmaligen Temperaturzyklen unterstehen. Solche Temperaturzyklen sind im hochtransienten Betrieb möglich. Gerade in diesen hochtransient belasteten Bereichen müssen die Rohrleitungen gegen ein Versagen abgesichert werden. Eine Schädigung der Rohrleitungswand in Folge von mehrmaligen Temperaturwechseln muss abgesichert werden.In power plants, for example, pipelines are used, which usually have the task to transport a flow medium safely and without loss of leakage. In addition to the simple transport task, the pipes must be designed mechanically under high thermal stress. However, reliable statements about the lifetime can be difficult if sufficient knowledge about the expected operation is not available. Pipelines subject to repeated temperature cycles are particularly heavily loaded. Such temperature cycles are possible in high-transient operation. Especially in these highly transient contaminated areas, the pipes must be secured against failure. Damage to the pipe wall as a result of repeated temperature changes must be ensured.

Neben dem hochtransienten Betrieb, der zu einer Belastung der Rohrleitung führt, sind auch Schweißnähte, mit denen Rohrleitungen zusammengefügt werden, eine Schwachstelle. An den Schweißnähten kann es zu Schädigungen kommen, die ein ungewolltes Ausströmen des Strömungsmediums zur Folge haben kann. Somit ist auch im Bereich einer Schweißnaht eine Absicherung gegen ein mögliches Versagen notwendig.In addition to the highly transient operation, which leads to a load on the pipeline, also welds, with which pipelines are joined together, a weak point. Damage may occur to the welds, which may result in unwanted leakage of the flow medium. Thus, in the area of a weld, a safeguard against a possible failure is necessary.

Besonders im Dampfkraftwerkbau werden Rohrleitungen eingesetzt, die thermisch besonders stark belastet werden. Es ist üblich, sogenannte Treibdampfkühler in den Rohrleitungen einzusetzen. Treibdampfkühler setzt man zur Dampfkühlung ein, wenn herkömmliche Einspritzkühler aufgrund schwieriger Betriebsparameter nicht oder nur unzureichend funktionieren. Treibdampfkühler umfassen in der Regel eine Zweistoffdüse, bei denen der Zerstäuberdampf mit kritischer Geschwindigkeit aus der Düsenmündung austritt und das eingespritzte Kühlwasser in mikrofeine Tröpfchen zerstäubt. Dadurch kann die Rohrleitung lokal abgekühlt werden. Es ist bekannt, ein sogenanntes Wärmeschutzschild im inneren Rohr einzusetzen, damit die thermische Belastung der Rohrwand reduziert wird. Das Schutzschild ist ein mechanisches Bauteil oder ein konusförmiger Dampfstrahl, der den zentralen Treibdampf konusförmig einhüllt. Dieses Schutzschild verhindert den Kontakt der Wassertropfen mit der Rohrwand. Dadurch sind Thermoschocks und Materialermüdung der Rohrwand reduziert.Especially in the construction of steam power plants pipelines are used, which are subjected to particularly high thermal loads. It is customary to use so-called motive steam coolers in the pipelines. Driving steam coolers are used for steam cooling, when conventional injection coolers do not work or only insufficiently due to difficult operating parameters. Drift steam coolers typically include a two-fluid nozzle in which the atomizer steam exits the nozzle orifice at critical velocity and atomizes the injected cooling water into microfine droplets. This allows the pipeline to be cooled locally. It is known to use a so-called heat shield in the inner tube, so that the thermal load on the pipe wall is reduced. The shield is a mechanical component or a cone-shaped steam jet, which envelops the central motive steam in a cone shape. This shield prevents the contact of the water droplets with the pipe wall. This reduces thermal shock and material fatigue of the pipe wall.

Allerdings hält solch ein Schutzschild den mechanischen Anforderungen nicht immer Stand. Ein Verlust des Schutzschildes durch Abplatzungen könnte zu einer lokalen Überhitzung der Rohrwand führen. Des Weiteren kann ein Abplatzen des Schutzschildes stromabliegende Baugruppen durch auch kleine, abgetragene Teile mechanisch beschädigen.However, such a shield does not always withstand the mechanical requirements. A loss of the shield by flaking could lead to a local overheating of the pipe wall. Furthermore, flaking off of the shield can mechanically damage downstream modules through even small, worn parts.

Es ist Aufgabe der Erfindung, eine Leitung derart anzulegen, dass ein sicherer Betrieb möglich ist.It is an object of the invention to create a line such that safe operation is possible.

Gelöst wird diese Aufgabe durch eine Leitung umfassend ein inneres Rohr sowie ein um das innere Rohr angeordnetes äußeres Rohr, wobei das äußere Rohr das innere Rohr gasdicht ummantelt, wobei ein Zwischenraum zwischen dem inneren und dem äußeren Rohr gebildet ist, wobei eine Absaugeinrichtung zum Absaugen von Strömungsmedium derart angeordnet ist, dass im Zwischenraum befindliches Strömungsmedium absaugbar ist, wobei die Absaugeinrichtung eine Erfassungseinrichtung umfasst, die ein Strömen des Strömungsmediums erkennt. Das Strömen des Strömungsmediums in der Absaugeinrichtung führt nahezu zwangsläufig zu dem Schluss, dass ein Leck im inneren Rohr vorhanden ist. Durch eine geeignete Erfassungseinrichtung, wie z.B. einem Durchflussmesszähler, kann ein Signal ausgesendet werden, das einen Schaden angibt.This object is achieved by a conduit comprising an inner tube and disposed around the inner tube outer tube, wherein the outer tube gas-tightly encases the inner tube, wherein a gap between the inner and the outer tube is formed, wherein a suction device for sucking Flow medium is arranged such that located in the intermediate space flow medium can be sucked, wherein the suction device comprises a detection device which detects a flow of the flow medium. The flow of the flow medium in the suction almost inevitably leads to the conclusion that a leak in the inner tube is present. By a suitable detection device, such as a flow meter, a signal may be sent indicating damage.

Die Erfindung geht von dem Aspekt aus, dass ein Schaden in der Leitung frühzeitig erfindungsgemäß detektiert werden kann. Im Falle eines Schadens kann Strömungsmedium in den Zwischenraum gelangen. Die Absaugeinrichtung, die zum Absaugen des Strömungsmediums ausgebildet ist, saugt das Strömungsmedium ab. Somit ist eine eindeutig identifizierbare physikalische Größe ermittelbar, um einen Schaden in der Leitung, insbesondere im inneren Rohr zu detektieren. Das in der Absaugeinrichtung befindliche Strömungsmedium muss mit geeigneten Mitteln detektiert werden, damit ein Schaden schließlich erfasst wird. Beispielsweise kann ein Durchflusszähler oder ein Temperaturfühler in der Absaugeinrichtung angeordnet werden. Eine Erhöhung der Temperatur führt zu dem Schluss, dass ein Leck im inneren Rohr vorhanden ist. Ebenso führt ein erhöhtes Durchflussaufkommen ebenso zu dem möglichen Schluss, dass ein Schaden im inneren Rohr vorhanden ist.The invention is based on the aspect that damage in the line can be detected early according to the invention. In the event of damage, flow medium may enter the gap. The suction device, which is designed to suck off the flow medium, sucks off the flow medium. Thus, a clearly identifiable physical quantity can be determined in order to detect a damage in the pipe, in particular in the inner pipe. The flow medium contained in the suction device must be detected by suitable means, so that a damage is finally detected. For example, a flow meter or a temperature sensor can be arranged in the suction device. An increase in temperature leads to the conclusion that there is a leak in the inner tube. Likewise, increased flow also leads to the possible conclusion that there is damage in the inner tube.

Sofern im inneren Rohr ein Schaden auftritt und das Strömungsmedium im Bereich des Schadens aus dem inneren Rohr herausgelangen kann, strömt das Strömungsmedium in den Zwischenraum der außerhalb des inneren Rohres liegt und gegenüber dem inneren Rohr gasdicht abgeschlossen ist. Das bedeutet, dass sich das Strömungsmedium im Zwischenraum sich befindet und nicht abströmen kann. Die einzige Abströmmöglichkeit wäre über die Absaugeinrichtung. Daher wird über ein in der Absaugeinrichtung detektierbares Strömungsmedium sofort der Schluss gezogen werden können, dass ein Schaden im inneren Rohr vorhanden ist. Sofern der Schaden nicht zu groß ist, kann die Leitung noch weiter verwendet werden.If damage occurs in the inner tube and the flow medium can escape from the inner tube in the region of the damage, the flow medium flows into the intermediate space which lies outside of the inner tube and is sealed gas-tight with respect to the inner tube. This means that the flow medium is in the space and can not escape. The only Abströmmöglichkeit would be on the suction. Therefore, it can be concluded that a damage is present in the inner tube via a detectable in the suction flow medium immediately. Unless the damage is too great, the line can still be used.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben. So wird in einer ersten vorteilhaften Weiterbildung die Absaugeinrichtung derart weitergebildet, dass diese eine Rohrleitung umfasst, die in den Zwischenraum ragt. Somit ist ein vergleichsweise einfaches Mittel zur Verfügung gestellt, das im Zwischenraum befindliche Strömungsmedium abzuführen. Die Rohrleitung muss lediglich mit einem Gerät verbunden werden, mit dem es möglich ist, einen anderen Druck, insbesondere einen niedrigeren Druck als im Zwischenraum herzustellen und das Strömungsmedium aufzunehmen.Advantageous developments are specified in the subclaims. Thus, in a first advantageous development, the suction device is developed in such a way that it comprises a pipeline which projects into the intermediate space. Thus, a comparatively simple means is provided remove the flow medium located in the intermediate space. The pipe only has to be connected to a device with which it is possible to produce a different pressure, in particular a lower pressure than in the intermediate space and to absorb the flow medium.

In einer weiteren vorteilhaften Weiterbildung weist die Erfassungseinrichtung ein Thermoelement auf. Neben dem Strömungszähler kann ein Thermoelement ein Schaden detektiert werden, da ein in der Absaugeinrichtung befindliches Strömungsmedium in der Regel eine höhere Temperatur aufweist. Durch ein Ansteigen der Temperatur, das durch das Thermoelement erfasst wird, kann ebenso der Schluss gezogen werden, dass ein Schaden im inneren Rohr aufgetaucht ist.In a further advantageous development, the detection device has a thermocouple. In addition to the flow meter, a damage to a thermocouple can be detected, since a flow medium located in the suction device generally has a higher temperature. By increasing the temperature detected by the thermocouple, it can also be concluded that damage has occurred in the inner tube.

In einer besonders vorteilhaften Weiterbildung umfasst die Leitung einen Kondensator, wobei die Absaugeinrichtung mit dem Kondensator strömungstechnisch verbunden ist. In Dampfkraftwerken steht ein geschlossener Wasserdampf-Kreislauf zur Verfügung. Das bedeutet, dass an einer Stelle Wasser zu Dampf umgewandelt wird, der im Kondensator wieder zu Wasser kondensiert. Im Kondensator ist der Druck sehr niedrig. Wenn die Absaugeinrichtung mit dem Kondensator strömungstechnisch verbunden ist, entsteht ein Druckgefälle von dem Zwischenraum zum Kondensator. Ein im Zwischenraum befindliches Strömungsmedium kann somit direkt zum Kondensator strömen. Dieses Strömen kann durch einen Durchflussmesser erfasst werden. Wie bereits erwähnt, kann auch dieses Strömen durch eine Temperaturerhöhung detektiert werden.In a particularly advantageous embodiment, the line comprises a capacitor, wherein the suction device is fluidically connected to the capacitor. In steam power plants, a closed steam cycle is available. This means that water is converted to steam at one point, which condenses back to water in the condenser. In the condenser, the pressure is very low. When the suction device is fluidically connected to the condenser, a pressure gradient arises from the intermediate space to the condenser. An in-space flow medium can thus flow directly to the condenser. This flow can be detected by a flow meter. As already mentioned, this flow can also be detected by a temperature increase.

In einer vorteilhaften Weiterbildung ist das äußere Rohr dünnwandiger ausgebildet als das innere Rohr.In an advantageous development, the outer tube is formed thinner than the inner tube.

Eine thermisch belastete Stelle der Leitung wird das als elastisch geschlossener Behälter ausgebildet ist erfindungsgemäß somit mit einem dünnwandigen Rohr, um das innere Rohr ausgebildet. Dieser Bereich kann z.B. im Bereich einer Schweißnaht sein oder im Bereich einer Mischstrecke stromab eines Treibdampfkühlers. Die unterschiedlichen thermischen Ausdehnungen des inneren Rohrs und des äußeren Rohrs führen zu einer Verspannung, die vom dünnwandigen, äußeren Rohr ausgeglichen werden kann. Das äußere Rohr ist daher derart ausgelegt, dass es den Verspannungen Stand hält. Daher ist das äußere Rohr dünnwandiger als das innere Rohr ausgebildet. Da nur leichte Leckagen detektiert werden sollen, muss das äußere Rohr nicht gegen den vollen Frischdampfdruck ausgelegt werden, was eine dünnwandige und somit elastische Konstruktion erlaubt. Aufgrund der dünnwandigen Konstruktion muss ggf. bei Auftreten von Vakuumlasten eine Auslegung gegen Beulen durchgeführt werden.A thermally loaded point of the conduit is formed as an elastically closed container according to the invention thus with a thin-walled tube, formed around the inner tube. This area can be, for example, in the area of a weld seam or downstream in the area of a mixing section a motive steam cooler. The different thermal expansions of the inner tube and the outer tube lead to a tension that can be compensated by the thin-walled, outer tube. The outer tube is therefore designed to withstand the rigors. Therefore, the outer tube is formed thinner than the inner tube. Since only slight leaks are to be detected, the outer tube need not be designed against the full live steam pressure, which allows a thin-walled and thus elastic construction. Due to the thin-walled design, a design against dents may be necessary if vacuum loads occur.

Damit der Zwischenraum möglichst gasdicht ist, wird in einer weiteren vorteilhaften Weiterbildung das innere Rohr an das äußere Rohr angeschweißt. In weiteren vorteilhaften Weiterbildungen umfasst die Leitung einen Treibdampfkühler, der durch das äußere Rohr und das innere Rohr ragt sowie gasdicht geführt ist. Das bedeutet, dass der Treibdampfkühler durch das innere Rohr und das äußere Rohr dampfdicht geführt wird.Thus, the gap is as gas-tight as possible, the inner tube is welded to the outer tube in a further advantageous development. In further advantageous developments, the line comprises a motive steam cooler, which protrudes through the outer tube and the inner tube and is guided gas-tight. This means that the motive steam cooler is guided vapor-tight through the inner tube and the outer tube.

Die Erfindung wird anhand eines Ausführungsbeispiels nun näher erläutert. Komponenten mit denselben Bezugszeichen zeigen in der Regel dieselben Eigenschaften.The invention will now be explained in more detail with reference to an embodiment. Components with the same reference numbers usually have the same characteristics.

Es zeigen:

Fig. 1
eine Querschnittsansicht einer Leitung,
Fig. 2
eine Querschnittsansicht der Leitung in Strömungsrichtung.
Show it:
Fig. 1
a cross-sectional view of a line,
Fig. 2
a cross-sectional view of the conduit in the flow direction.

Die Figur 1 zeigt eine Leitung 1 im Querschnitt. Die Leitung 1 umfasst ein inneres Rohr 2 und ein äußeres Rohr 3. Die Leitung 1 ist für eine Dampfführung von vergleichsweise heißem Dampf (> 600°C) geeignet. Das äußere Rohr 3 ist gasdicht an das innere Rohr 2 angeordnet. Dazu weist das äußere Rohr 3 eine Schweißnaht 4, die in Umfangsrichtung bezüglich einer Rotationsachse 5 ausgebildet ist. Zwischen dem äußeren Rohr 3 und dem inneren Rohr 2 ist ein Zwischenraum 6 gebildet. Die Leitung 1 wird besonders an den Stellen, die thermisch stark belastet werden, mit dem äußeren Rohr 3 ausgebildet. Das äußere Rohr 3 ist gegenüber dem inneren Rohr 2 dünnwandig ausgebildet. Das bedeutet, dass die Wand des äußeren Rohres 3 gegenüber dem inneren Rohr 2 dünner ausgeführt ist. Das innere Rohr 2 als auch äußere Rohr 3 sind aus einem Stahl hergestellt. Die Wanddicke des äußeren Rohres 3 ist zwischen 10% und 80% der Dicke des inneren Rohres 2. Die Dicke des äußeren Rohres 3 kann auch folgende Bereiche annehmen: 20% - 70%, 20% - 60%, 20% - 50% der Wanddicke des inneren Rohres 2.The FIG. 1 shows a line 1 in cross section. The conduit 1 comprises an inner tube 2 and an outer tube 3. The conduit 1 is suitable for a steam guide of comparatively hot steam (> 600 ° C). The outer tube 3 is gas-tightly arranged on the inner tube 2. For this purpose, the outer tube 3 has a weld 4, which is formed in the circumferential direction with respect to a rotation axis 5. Between the outer tube 3 and the inner tube 2, a gap 6 is formed. The line 1 is formed with the outer tube 3, especially at the points which are subjected to high thermal loads. The outer tube 3 is thin-walled with respect to the inner tube 2. This means that the wall of the outer tube 3 is made thinner relative to the inner tube 2. The inner tube 2 and outer tube 3 are made of a steel. The wall thickness of the outer tube 3 is between 10% and 80% of the thickness of the inner tube 2. The thickness of the outer tube 3 can also assume the following ranges: 20% - 70%, 20% - 60%, 20% - 50% of Wall thickness of the inner tube 2.

Die Wanddicke des äußeren Rohres 3 ist deswegen dünnwandiger gegenüber dem inneren Rohr 2 ausgeführt, damit die im Betrieb auftretenden unterschiedlichen thermischen Ausdehnungen des inneren Rohres 2 und des äußeren Rohres 3 zu Verspannungen führen, die vom dünnwandigen, äußeren Rohr 3 ausgeglichen werden können. Je nach Anforderung müssen zusätzliche flexible Elemente berücksichtigt werden (z.B. balgähnliche Konstruktionen. Das äußere Rohr 3 ist gegen Beulen ausgelegt. Falls es zu einem Leck kommen sollte, wird durch das Leck eine Strömung in den Zwischenraum 6 stattfinden, der durch eine Absaugeinrichtung 7 detektiert werden kann. Im einfachsten Fall ist die Absaugeinrichtung 7 als eine Rohrleitung 8 ausgebildet, die in den Zwischenraum 6 ragt. Diese Rohrleitung 8 ist strömungstechnisch mit einem nicht näher dargestellten Kondensator verbunden. Das bedeutet, dass der niedrige Druck im Kondensator dazu führt, dass eine Strömung von dem Strömungsmedium im Zwischenraum, in dem ein größerer Druck herrscht als im Kondensator, abgeführt werden kann.The wall thickness of the outer tube 3 is therefore designed to be thinner-walled with respect to the inner tube 2, so that the different thermal expansions of the inner tube 2 and the outer tube 3 during operation lead to stresses that can be compensated by the thin-walled, outer tube 3. Depending on the requirement, additional flexible elements must be taken into account (eg bellows-like constructions.) If a leak should occur, the leak will cause a flow into the intermediate space 6, which will be detected by a suction device 7 In the simplest case, the suction device 7 is designed as a pipeline 8 which protrudes into the intermediate space 6. This pipeline 8 is fluidically connected to a condenser not shown in detail, which means that the low pressure in the condenser causes a flow from the flow medium in the intermediate space, in which a greater pressure prevails than in the condenser, can be dissipated.

Das äußere Rohr 3 ummantelt das innere Rohr gasdicht. Die Absaugeinrichtung 7 ist zum Absaugen von Strömungsmedium ausgebildet, das sich im Zwischenraum 6 befindet. Die Absaugeinrichtung 7 umfasst eine Erfassungseinrichtung, die nicht näher dargestellt ist, die ein Strömen des Mediums erkennt. Im einfachsten Fall kann ein Durchflussmesszähler in der Rohrleitung 8 angeordnet werden, der ein kurzfristiges Ansteigen der Strömung in der Rohrleitung 8 als ein Leck im inneren Rohr 2 ermitteln kann.The outer tube 3 encloses the inner tube gas-tight. The suction device 7 is designed for the extraction of flow medium, which is located in the intermediate space 6. The suction device 7 comprises a detection device, which is not shown in detail, which detects a flow of the medium. In the simplest case, a flow meter can be arranged in the pipeline 8, which is a short-term increase the flow in the pipe 8 can detect as a leak in the inner tube 2.

Alternativ oder zusätzlich zu dem Strömungsmesszähler kann ein Thermoelement 9 in der Rohrleitung 8 angeordnet werden. Ein plötzliches Ansteigen der Temperatur, die durch das Thermoelement 9 erfasst wird, führt zu dem Schluss, dass ein Leck im inneren Rohr 2 entstanden ist.Alternatively or in addition to the flow meter, a thermocouple 9 can be arranged in the pipe 8. A sudden increase in the temperature detected by the thermocouple 9 leads to the conclusion that a leak has occurred in the inner tube 2.

Das innere Rohr 2 ist besonders hochtransient belastet. Das bedeutet, dass wechselnde Temperaturzyklen an dieser Stelle auftreten. In alternativen Ausführungsformen wird die Leitung 1 mit einem Treibdampfkühler 10 ausgebildet, der gas- oder dampfdicht durch das innere Rohr 2 und das äußere Rohr 3 angeordnet ist. Besonders im Bereich eines Treibdampfkühlers 10 wird das innere Rohr 2 thermisch stark belastet. Durch den Treibdampfkühler 10 wird ein Zerstäuberdampf mit kritischer Geschwindigkeit aus der Düsenmündung austreten und das in Rotationsachsenrichtung 5 eingespritzte Kühlwasser in mikrofeine Tröpfchen zerstäubt.The inner tube 2 is subjected to a particularly high transient load. This means that changing temperature cycles occur at this point. In alternative embodiments, the conduit 1 is formed with a motive steam cooler 10, which is arranged gas-tight or vapor-tight through the inner tube 2 and the outer tube 3. Particularly in the region of a motive steam cooler 10, the inner tube 2 is subjected to a high thermal load. By means of the motive steam cooler 10, an atomizing steam will emerge from the nozzle orifice at a critical velocity and the cooling water injected in the direction of rotation axis 5 will be atomized into microfine droplets.

Die Figur 2 zeigt die Leitung 1 in einer Querschnittsansicht (in Richtung der Rotationsachse 5 gesehen). Der Zwischenraum 6 ist, wie in der Figur 2 deutlich zu sehen, ein gas- oder dampfdicht ausgeführter Raum, in dem ein im inneren Rohr 2 auftretende Leckage erfasst und detektiert werden kann. Die Absaugeinrichtung 7 ist nicht näher dargestellt.The FIG. 2 shows the line 1 in a cross-sectional view (seen in the direction of the axis of rotation 5). The gap 6 is, as in the FIG. 2 clearly seen, a gas or vapor-tight executed space in which a leak occurring in the inner tube 2 can be detected and detected. The suction device 7 is not shown in detail.

Claims (8)

  1. Line (1) comprising an inner tube (2) and an outer tube (3) arranged around the inner tube (2),
    wherein the outer tube (3) surrounds the inner tube (2) in a gas-tight manner,
    wherein an interspace (6) is formed between the inner (2) and the outer (3) tube,
    wherein a suction device (7) for sucking out flow medium is arranged such that flow medium in the interspace (6) can be sucked out,
    characterized in that
    the suction device (7) has a detection device which identifies a flow of the flow medium.
  2. Line (1) according to Claim 1,
    wherein the suction device (7) comprises a pipe (8) which projects into the interspace (6).
  3. Line (1) according to Claim 1,
    wherein the detection device has a thermocouple (9).
  4. Line (1) according to one of the preceding claims, comprising a condenser,
    wherein the suction device (7) is fluidically connected to a condenser.
  5. Line (1) according to one of the preceding claims,
    wherein the wall of the outer tube (3) is thinner than that of the inner tube (2).
  6. Line (1) according to one of the preceding claims,
    wherein the outer tube (3) is welded onto the inner tube (2).
  7. Line (1) according to one of the preceding claims,
    having a propellant steam cooler (10) which projects through the outer tube (3) and the inner tube (2).
  8. Line (1) according to Claim 7,
    wherein the propellant steam cooler (10) is guided through the outer tube (3) and the inner tube (2) in a gas- or steam-tight manner.
EP11748350.3A 2010-09-02 2011-08-18 Line having a safety system Not-in-force EP2612072B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11748350.3A EP2612072B1 (en) 2010-09-02 2011-08-18 Line having a safety system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10175072A EP2426412A1 (en) 2010-09-02 2010-09-02 Conduit with safety system
EP11748350.3A EP2612072B1 (en) 2010-09-02 2011-08-18 Line having a safety system
PCT/EP2011/064206 WO2012028462A1 (en) 2010-09-02 2011-08-18 Line having a safety system

Publications (2)

Publication Number Publication Date
EP2612072A1 EP2612072A1 (en) 2013-07-10
EP2612072B1 true EP2612072B1 (en) 2016-01-20

Family

ID=43995248

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10175072A Withdrawn EP2426412A1 (en) 2010-09-02 2010-09-02 Conduit with safety system
EP11748350.3A Not-in-force EP2612072B1 (en) 2010-09-02 2011-08-18 Line having a safety system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10175072A Withdrawn EP2426412A1 (en) 2010-09-02 2010-09-02 Conduit with safety system

Country Status (3)

Country Link
EP (2) EP2426412A1 (en)
CN (1) CN103097817B (en)
WO (1) WO2012028462A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE566005A (en) *
GB551699A (en) * 1941-09-02 1943-03-05 Babcock & Wilcox Ltd Improvements in desuperheaters
FR1041891A (en) * 1950-10-28 1953-10-27 Weser Ag Installation with piston engine and exhaust steam turbine for the propulsion of boats and ships
US3034771A (en) * 1958-11-06 1962-05-15 Schutte & Koerting Co Desuperheater
US3187682A (en) * 1963-11-01 1965-06-08 Ingersoll Rand Co High vacuum steam ejector
JPH09303709A (en) * 1996-05-13 1997-11-28 Ishikawajima Harima Heavy Ind Co Ltd Desuperheater
JPH11173505A (en) * 1997-12-15 1999-06-29 Mitsubishi Heavy Ind Ltd Steam temperature reducer
CN201137931Y (en) * 2007-12-13 2008-10-22 河北盛华化工有限公司 Spray attemperator for circulating fluid bed boiler
CN201475985U (en) * 2009-08-05 2010-05-19 无锡卓尔阀业有限公司 High-temperature and high-pressure positive-effect desuperheater

Also Published As

Publication number Publication date
CN103097817A (en) 2013-05-08
EP2612072A1 (en) 2013-07-10
EP2426412A1 (en) 2012-03-07
WO2012028462A1 (en) 2012-03-08
CN103097817B (en) 2015-04-01

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