EP0208056B1 - Valve de décharge de sécurité - Google Patents

Valve de décharge de sécurité Download PDF

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Publication number
EP0208056B1
EP0208056B1 EP86103374A EP86103374A EP0208056B1 EP 0208056 B1 EP0208056 B1 EP 0208056B1 EP 86103374 A EP86103374 A EP 86103374A EP 86103374 A EP86103374 A EP 86103374A EP 0208056 B1 EP0208056 B1 EP 0208056B1
Authority
EP
European Patent Office
Prior art keywords
steam
perforated
ports
valve
inlet branch
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.)
Expired
Application number
EP86103374A
Other languages
German (de)
English (en)
Other versions
EP0208056A1 (fr
Inventor
Theofani Gikadi
Georg Lohle
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.)
Deutsche Babcock Werke AG
Original Assignee
Deutsche Babcock Werke 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 Deutsche Babcock Werke AG filed Critical Deutsche Babcock Werke AG
Priority to AT86103374T priority Critical patent/ATE34209T1/de
Publication of EP0208056A1 publication Critical patent/EP0208056A1/fr
Application granted granted Critical
Publication of EP0208056B1 publication Critical patent/EP0208056B1/fr
Expired legal-status Critical Current

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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
    • F22G5/123—Water injection apparatus
    • F22G5/126—Water injection apparatus in combination with steam-pressure reducing valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/04—Plants characterised by condensers arranged or modified to co-operate with the engines with dump valves to by-pass stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves

Definitions

  • the invention relates to a safety overflow valve with the features of the preamble of claim 1.
  • a safety overflow valve with the features of the preamble of claim 1.
  • Such a valve is known from FR-A-2.139.079.
  • an overflow station has recently been used as a connection between the superheater outlet on the high-pressure part of the steam generator and the reheater inlet, which is also intended to serve as a safety device.
  • This overflow station has several tasks to perform. The steam pressure from the high-pressure rail to the medium-pressure rail of the boiler system must be reduced in a controlled manner. This partially expanded steam must be cooled to the temperature at the reheater inlet. Finally, the boiler concession pressure must not be exceeded.
  • So-called steam conversion valves are known (DE-C 19 45 035, D E-C 25 44 970), which serve to reduce the pressure and temperature of steam.
  • These steam conversion valves have a throttle element designed as a parabolic or perforated cone for the steam.
  • a spray water line is provided, which is connected to injection bores arranged one above the other in several levels.
  • the throttle member and the injection bores are functionally linked to one another in such a way that the cross section of the injection bores released by the respective position of the throttle member is adapted to the released steam control cross section.
  • the spray water is supplied from below and within a narrow space in which there are also high steam speeds. Because of this narrowness of space, the surface available for evaporation is small. In addition, the high steam speeds do not allow water particles to penetrate to the center of the steam jet.
  • the known steam conversion valves do not have a shut-off cone pressurized from below, as is basically required and used in safety valves. Because of the spray water supplied from below, the known steam conversion valves cannot therefore be easily provided with a safety device.
  • the invention is based on the object of designing a safety overflow valve of the generic type in such a way that a pressure and temperature reduction is possible at the same time, the spray water being introduced into the steam flow in the best possible way.
  • the spray water is supplied from above, so that the arrangement of a shut-off cone pressurized from below is possible.
  • This enables the Venil to perform the function of a safety device in conjunction with a pressure and temperature reduction.
  • the water is injected in such a way that a large surface is provided, through which the water penetrates into the stream of the steam, which has only partially been released. This ensures that the water evaporates evenly.
  • the spray water is supplied in the vicinity of the valve seat according to the features of claim 3.
  • the safety overflow valve is arranged in the steam line of the high pressure section of a boiler system. It contains a housing 1, which is closed by a cover 3 fastened with the aid of screws 2.
  • the housing 1 has a steam inlet connector 4 and a steam outlet connector 5.
  • the valve seat is formed by a seat bushing 6 and is released or closed by a shut-off cone 7.
  • the shut-off cone 7 is fastened to an axially adjustable spindle 8 which is passed through the cover 3.
  • the pressing force which is applied by a hydraulic system and which opposes the pressure of the steam coming from below the shut-off cone 7, acts on the spindle 8.
  • the shut-off cone 7 is connected on the side facing the steam inlet connection 4 to a perforated cone 9 designed as a hollow cylinder.
  • the perforated cone 9 is loosely guided in the seat bushing 6 and provided with through bores 10 which, according to FIG. 2, are arranged one above the other in several planes and distributed over the circumference.
  • a further pressure reduction takes place when the steam passes through a perforated cylinder 11, which is arranged in the housing 1 at a radial distance from the perforated cone 9 between the steam inlet nozzle 4 and the steam outlet nozzle 5.
  • the perforated cylinder 11 shown can be followed by further perforated cylinders.
  • the shut-off cone 7 On the side facing away from the steam inlet connection 4, the shut-off cone 7 is provided with an as Hollow cylinder formed perforated basket 12 connected.
  • the perforated cage 12 In its lower part, the perforated cage 12 contains through bores 13 which are arranged one above the other in several planes and distributed over the circumference (FIG. 3).
  • the perforated cage 12 has a closed-walled section 14 above the through bores 13.
  • the perforated basket 12 encloses a guide piece 15 through which the spindle 8 is passed.
  • the guide piece 15 is provided with axial bores 16 which are connected via an upper annular space 17 and two bores 18 in the cover 3 with connecting pieces 19 which are connected to a supply line for splash water.
  • the axial bores 16 end in a lower annular space 20 which is open to the perforated basket 12.
  • the height of the lower annular space 20 is less than the height of the closed-walled section 14 of the perforated basket 12.
  • the guide piece 15 and the perforated basket 12 are arranged with respect to one another such that in the Closed position of the valve, the closed-walled section 14 of the perforated basket 12 closes the lower annular space 20.
  • the perforated cone 9 When the safety overflow valve is actuated in accordance with the requirements of the boiler system, the perforated cone 9 is moved upwards together with the perforated basket 12, so that the individual through bores 10, 13 on the perforated cone 9 for steam and on the perforated basket 12 for water injection are thereby released.
  • the number of through bores 13 in the perforated cage 12 and thus the flow cross section can be varied as a function of the stroke, so that the water speed and thus the relative speed to the steam at the injection point is large over the entire operating characteristic of the safety overflow valve.
  • the water is finely distributed over a large surface and injected at high speed close to the expanding steam flow. It can mix and vaporize optimally with the steam flow.
  • the perforated basket 12 is provided with a plurality of axially parallel bores 21 which are closed at both ends.
  • the upper end of each axially parallel bore 21 is connected to a radial bore 22 which is only open towards the guide piece 15.
  • one or more injection holes 23 are provided which are open to the valve interior.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Lift Valve (AREA)
  • Safety Valves (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Compressor (AREA)
  • Multiple-Way Valves (AREA)
  • Nozzles (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Materials For Medical Uses (AREA)
  • Sliding Valves (AREA)

Claims (3)

1. Soupape de sécurité à surdébit pour vapeur, comportant un corps (1 ) doté d'une tubulure d'entrée de vapeur (4), d'une tubulure de sortie de vapeur (5) et d'un siège de soupape, soupape pouvant se fermer par un clapet d'arrêt (7) dont le sens de fermeture est opposé à celui du flux de vapeur et dont la tige (8) est réglable en position axiale, caractérisée en ce que le clapet d'arrêt (7) est raccordé, du côté de la tubulure d'entrée de vapeur (4), à un clapet perforé (9) et, du côté opposé, à une crépine (12), ces deux derniers organes étant chacun constitués d'un cylindre creux et présentant des perçages traversants (10, 13) disposés les uns au-dessus des autres sur plusieurs niveaux et répartis sur la périphérie, et en ce que la crépine (12) présente, au-dessus des perçages traversants (13), un secteur (14) à paroi pleine et entoure de façon étanche une pièce de guidage (15) reliée à un raccord d'eau d'injection.
2. Soupape de sécurité à surdébit selon la revendication 1, caractérisée en ce que la pièce de guidage (15) est disposée concentriquement à la tige (8) et présente des perçages axiaux (16) qui, à l'extrémité inférieure, débouchent dans un espace annulaire (20) ouvert en direction de la crépine (12), espace annulaire dont la hauteur est inférieure à celle du secteur à paroi pleine (14) de la crépine (12).
3. Soupape de sécurité à surdébit selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que la crépine (12) présente, en plus des perçages (13), des perçages (21 ) à direction axiale qui, à l'extrémité supérieure, se raccordent à des perçages radiaux intérieurs (22) et, à l'extrémité inférieure, à des trous d'injection (23) ouverts en direction de l'espace intérieur de la soupape.
EP86103374A 1985-07-11 1986-03-13 Valve de décharge de sécurité Expired EP0208056B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86103374T ATE34209T1 (de) 1985-07-11 1986-03-13 Sicherheitsueberstroemventil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3524732A DE3524732C1 (de) 1985-07-11 1985-07-11 Sicherheitsueberstroemventil
DE3524732 1985-07-11

Publications (2)

Publication Number Publication Date
EP0208056A1 EP0208056A1 (fr) 1987-01-14
EP0208056B1 true EP0208056B1 (fr) 1988-05-11

Family

ID=6275476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103374A Expired EP0208056B1 (fr) 1985-07-11 1986-03-13 Valve de décharge de sécurité

Country Status (6)

Country Link
EP (1) EP0208056B1 (fr)
AT (1) ATE34209T1 (fr)
CS (1) CS257288B2 (fr)
DD (1) DD248176A5 (fr)
DE (2) DE3524732C1 (fr)
SU (1) SU1452492A3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533363C1 (de) * 1985-09-19 1987-03-26 Babcock Werke Ag Sicherheitsueberstroemventil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB230304A (en) * 1924-05-03 1925-03-12 Babcock & Wilcox Ltd Improvements relating to safety valves
DE1193965B (de) * 1959-07-15 1965-06-03 Bbc Brown Boveri & Cie Hydraulische Regelungseinrichtung fuer Dampf-turbinen mit Zwischenueberhitzung
CH502513A (de) * 1969-01-08 1971-01-31 Sulzer Ag Zwischen Dampferzeuger und Verbraucher angeordnetes Überströmventil
US3732851A (en) * 1971-05-26 1973-05-15 R Self Method of and device for conditioning steam
DE2544970C2 (de) * 1975-10-08 1982-02-04 Deutsche Babcock Ag, 4200 Oberhausen Dampfumformventil
DE3304523A1 (de) * 1983-02-10 1984-08-16 Holter Regelarmaturen Gmbh & Co Kg, 4815 Schloss Holte-Stukenbrock Dampfumformventil

Also Published As

Publication number Publication date
DD248176A5 (de) 1987-07-29
ATE34209T1 (de) 1988-05-15
DE3524732C1 (de) 1986-09-04
DE3660193D1 (en) 1988-06-16
CS257288B2 (en) 1988-04-15
EP0208056A1 (fr) 1987-01-14
CS502886A2 (en) 1987-09-17
SU1452492A3 (ru) 1989-01-15

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