EP1918532B1 - Desuperheater apparatus for steam lines - Google Patents

Desuperheater apparatus for steam lines Download PDF

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Publication number
EP1918532B1
EP1918532B1 EP06425745.4A EP06425745A EP1918532B1 EP 1918532 B1 EP1918532 B1 EP 1918532B1 EP 06425745 A EP06425745 A EP 06425745A EP 1918532 B1 EP1918532 B1 EP 1918532B1
Authority
EP
European Patent Office
Prior art keywords
steam
chamber
desuperheater
spray
desuperheater apparatus
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.)
Active
Application number
EP06425745.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1918532A1 (en
Inventor
Salvatore Ruggeri
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.)
Valvitalia SpA
Original Assignee
Valvitalia SpA
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 Valvitalia SpA filed Critical Valvitalia SpA
Priority to ES06425745.4T priority Critical patent/ES2574011T3/es
Priority to EP06425745.4A priority patent/EP1918532B1/en
Publication of EP1918532A1 publication Critical patent/EP1918532A1/en
Application granted granted Critical
Publication of EP1918532B1 publication Critical patent/EP1918532B1/en
Active 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
    • 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
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/002—Steam conversion

Definitions

  • the present invention relates to a desuperheater apparatus for steam lines according to the preamble of claim 1, particularly to an apparatus for use in a steam bypass line of a steam turbine or cogeneration system.
  • water droplets in steam tend to gather at the intrados of a pipe bend, i.e. where the radius of curvature of the pipe is smaller.
  • Document DE 3720918 discloses a known steam reducing valve.
  • This invention is based on the issue of providing a desuperheater apparatus which has such structural and functional characteristics as to fulfill the need of reducing the undesired presence of residual water droplets in the steam flow at the outlet of the desuperheater apparatus, while obviating the above prior art drawbacks.
  • numeral 1 generally designates a desuperheater apparatus of the invention, which is adapted to be integrated in a steam bypass line of a turbine or a cogeneration system.
  • Figure 1 shows the desuperheater apparatus 1 interposed between two sections T of the steam pipeline.
  • the apparatus 1 comprises a plurality of chambers placed in series and separated by suitable steam pressure reducing sections. These chambers and steam pressure reducing sections define a fluid path for a steam flow within the apparatus 1. As steam flows through the steam pressure reducing sections, it is subjected to pressure reduction.
  • the desuperheater apparatus 1 comprises the following three chambers:
  • the first chamber 2 has its inlet connected to the steam supply pipe and its outlet connected to the inlet of the next intermediate chamber 3.
  • the throttling steam pressure reducing section of the first chamber 2 comprises valve means 5 with a perforated cage-like valve seat defining a steam pressure reducing section, which receives a slideable closing member 6, whose position relative to the valve seat can be adjusted from the outside. It will be appreciated that, by adjusting the position of the closing member from a completely closed to a completely open position, various valve capacity control values may be obtained, which are caused by changes of the throttling section, and steam flow rates through the desuperheater apparatus 1.
  • the intermediate chamber 3 is shaped in such a manner as to provide expansion of the steam flowing out of the above mentioned valve means 5. Particularly, this effect is achieved because the intermediate chamber 3 defines an expansion chamber.
  • the intermediate expansion chamber 3 has its upstream end closed by the above mentioned static means 8 which form a section adapted to reduce the pressure of steam flowing into the intermediate chamber 3.
  • these static steam pressure reducing means 8 include a perforated basket filter, through which steam must flow to enter the intermediate expansion chamber 3.
  • the perforated basket 8 allows to reduce both the velocity of steam at the outlet of the first chamber 2 and the noise generated by the flowing steam.
  • the final chamber 4 comprises a tubular body 10 extending along a predetermined longitudinal axis X-X.
  • a steam diffuser 11 which defines a steam reducing section, having a plurality of holes 12 for the passage of steam.
  • the final chamber 4 has at least two spray nozzles 9, which are associated to the tubular body 10 to generate respective steam cooling spray cones C in such tubular body 10.
  • the tubular body 10 has through holes for the ends of such spray nozzles 9 to extend therethrough.
  • the spray nozzles 9 are placed in the proximity of the steam diffuser 11. It should be noted that the holes 12 of the steam diffuser 11 are located in greater number near each spray nozzle 9, where they define corresponding perforated portions.
  • these perforated portions of the steam diffuser 11 are inclined to form a predetermined angle A with the above mentioned longitudinal axis X-along which the tubular body 10 of the final chamber 4 extends, so that the perforated portions are substantially parallel to the lateral surface of the spray cones C generated by their corresponding spray nozzles 9.
  • the steam diffuser 11 is tapered and has a frusto-conical shape in the illustrated example, having a diverging taper with respect to the longitudinal axis X-X, as seen in the steam flowing direction within the tubular body 10.
  • the spray cone C generated by each spray nozzle 9 tangentially flows over the corresponding perforated portion of the steam diffuser 11.
  • This effect is simply obtained, with the spray nozzles 9 oriented perpendicular to the longitudinal axis X-X (like in the illustrated embodiment), by the following provisions:
  • the steam diffuser 11 in the proximity of the inner wall of the tubular body 10, is conformed in such a manner as to define a limited annular portion 13, which is substantially perpendicular to the wall of the tubular body and is joined to the conical portion. It should be noted that, at each spray nozzle 9, such annular portion 13 also has a plurality of holes 12 for the passage of steam.
  • this annular portion 13 of the steam diffuser 11 is integrally joined to an inner tubular element 14, which is coaxially inserted in such tubular chamber 10 that defines the final chamber 4 to be in contact therewith all along its surface.
  • the inner tubular element 14 has respective through holes which are substantially aligned with the holes of the tubular body 10 to allow the passage of the spray nozzles 9.
  • the desuperheater apparatus of the invention fulfills the above mentioned need and also obviates prior art drawbacks as set out in the introduction to this disclosure. That is, the desuperheater apparatus of the invention considerably improves the efficiency of the steam desuperheating process thanks to the provision of the frusto-conical diffuser and to the manner in which the steam flowing therethrough impinges the spray cone C of each spray nozzle 9. Particularly, the desuperheater apparatus of the invention provides the following advantages:
  • the steam diffuser in addition to being closer to the outlet of the spray nozzles 9, the steam diffuser a higher density and localization of holes at the spray nozzles 9, so that steam passage is concentrated where it is actually more useful.
  • the desuperheater apparatus of the invention improves the overall steam desuperheating efficiency when compared with prior art apparatus, thereby providing apparent advantages to the steam plant in which such desuperheater apparatus is designed to be used.
  • the desuperheater apparatus allows to reduce the length of the section of straight steam pipeline to be provided downstream from the desuperheater apparatus.
  • a further advantage of the desuperheater apparatus of the invention is its structural simplicity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Nozzles (AREA)
EP06425745.4A 2006-10-30 2006-10-30 Desuperheater apparatus for steam lines Active EP1918532B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES06425745.4T ES2574011T3 (es) 2006-10-30 2006-10-30 Aparato desrecalentador para líneas de vapor
EP06425745.4A EP1918532B1 (en) 2006-10-30 2006-10-30 Desuperheater apparatus for steam lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425745.4A EP1918532B1 (en) 2006-10-30 2006-10-30 Desuperheater apparatus for steam lines

Publications (2)

Publication Number Publication Date
EP1918532A1 EP1918532A1 (en) 2008-05-07
EP1918532B1 true EP1918532B1 (en) 2016-04-20

Family

ID=38606681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425745.4A Active EP1918532B1 (en) 2006-10-30 2006-10-30 Desuperheater apparatus for steam lines

Country Status (2)

Country Link
EP (1) EP1918532B1 (es)
ES (1) ES2574011T3 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101255112B1 (ko) * 2012-11-05 2013-04-19 김현구 과열 수증기를 이용한 살균 난방기

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH641540A5 (de) * 1979-09-05 1984-02-29 Sulzer Ag Dampf-drosselventil.
DE3720918C1 (en) * 1987-06-25 1988-11-24 Welland & Tuxhorn Steam reducing valve
SE501510C2 (sv) * 1992-08-26 1995-03-06 Btg Kaelle Inventing Ab Förfarande och anordning för reducering av en ångas tryck och temperatur vid en ångkonditioneringsventil
EP1326048B1 (en) * 2002-01-04 2005-05-25 Dresser, Inc. Steam pressure reducing valve

Also Published As

Publication number Publication date
EP1918532A1 (en) 2008-05-07
ES2574011T3 (es) 2016-06-14

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