EP2612072B1 - Conduite pourvue d'un système de sécurité - Google Patents

Conduite pourvue d'un système de sécurité 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
Authority
EP
European Patent Office
Prior art keywords
inner tube
outer tube
line
tube
flow
Prior art date
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
Application number
EP11748350.3A
Other languages
German (de)
English (en)
Other versions
EP2612072A1 (fr
Inventor
Henning Almstedt
Edwin Gobrecht
Lars Homeier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP11748350.3A priority Critical patent/EP2612072B1/fr
Publication of EP2612072A1 publication Critical patent/EP2612072A1/fr
Application granted granted Critical
Publication of EP2612072B1 publication Critical patent/EP2612072B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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.

Landscapes

  • 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)

Claims (8)

  1. Conduite (1), comprenant un tuyau (2) intérieur, ainsi qu'un tuyau (3) extérieur disposé autour du tuyau (2) intérieur,
    dans laquelle le tuyau (3) extérieur entoure le tuyau (2) intérieur d'une manière étanche au gaz,
    dans laquelle un espace (6) intermédiaire est formé entre le tuyau (2) intérieur et le tuyau (3) extérieur,
    dans laquelle un dispositif (7) d'aspiration du fluide en écoulement est disposé de manière à pouvoir aspirer du fluide en écoulement se trouvant dans l'espace (6) intermédiaire, caractérisé en ce que
    le dispositif (7) d'aspiration a un dispositif de détection, qui détecte un écoulement du fluide en écoulement.
  2. Conduite (1) suivant la revendication 1,
    dans laquelle le dispositif (7) d'aspiration entoure une canalisation (8), qui pénètre dans l'espace (6) intermédiaire.
  3. Conduite (1) suivant la revendication 1,
    dans laquelle le dispositif de détection a un thermocouple (9).
  4. Conduite (1) suivant l'une des revendications précédentes, comprenant un condenseur,
    dans laquelle le dispositif (7) d'aspiration communique fluidiquement avec un condenseur.
  5. Conduite (1) suivant l'une des revendications précédentes, dans laquelle le tuyau (3) extérieur est à paroi plus mince que le tuyau (2) intérieur.
  6. Conduite (1) suivant l'une des revendications précédentes, dans laquelle le tuyau (3) extérieur est soudé au tuyau (2) intérieur.
  7. Conduite (1) suivant l'une des revendications précédentes, comprenant un refroidisseur (10) de vapeur motrice, qui pénètre dans le tuyau (3) extérieur et dans le tuyau (2) intérieur.
  8. Conduite (1) suivant la revendication 7,
    dans laquelle le refroidisseur (10) de vapeur motrice passe dans le tuyau (3) extérieur et dans le tuyau (2) intérieur d'une manière étanche au gaz ou étanche à la vapeur.
EP11748350.3A 2010-09-02 2011-08-18 Conduite pourvue d'un système de sécurité Not-in-force EP2612072B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11748350.3A EP2612072B1 (fr) 2010-09-02 2011-08-18 Conduite pourvue d'un système de sécurité

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10175072A EP2426412A1 (fr) 2010-09-02 2010-09-02 Conduite dotée d'un système de sécurité
PCT/EP2011/064206 WO2012028462A1 (fr) 2010-09-02 2011-08-18 Conduite pourvue d'un système de sécurité
EP11748350.3A EP2612072B1 (fr) 2010-09-02 2011-08-18 Conduite pourvue d'un système de sécurité

Publications (2)

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

Family

ID=43995248

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10175072A Withdrawn EP2426412A1 (fr) 2010-09-02 2010-09-02 Conduite dotée d'un système de sécurité
EP11748350.3A Not-in-force EP2612072B1 (fr) 2010-09-02 2011-08-18 Conduite pourvue d'un système de sécurité

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10175072A Withdrawn EP2426412A1 (fr) 2010-09-02 2010-09-02 Conduite dotée d'un système de sécurité

Country Status (3)

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

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE566005A (fr) *
GB551699A (en) * 1941-09-02 1943-03-05 Babcock & Wilcox Ltd Improvements in desuperheaters
FR1041891A (fr) * 1950-10-28 1953-10-27 Weser Ag Installation avec machine à pistons et turbine à vapeur d'échappement pour la propulsion des bateaux et navires
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 (ja) * 1996-05-13 1997-11-28 Ishikawajima Harima Heavy Ind Co Ltd 過熱低減器
JPH11173505A (ja) * 1997-12-15 1999-06-29 Mitsubishi Heavy Ind Ltd 蒸気減温器
CN201137931Y (zh) * 2007-12-13 2008-10-22 河北盛华化工有限公司 一种用于循环流化床锅炉的喷水减温器
CN201475985U (zh) * 2009-08-05 2010-05-19 无锡卓尔阀业有限公司 高温高压正作用减温器

Also Published As

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

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