EP1965132A1 - Enthitzer - Google Patents

Enthitzer Download PDF

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Publication number
EP1965132A1
EP1965132A1 EP07003979A EP07003979A EP1965132A1 EP 1965132 A1 EP1965132 A1 EP 1965132A1 EP 07003979 A EP07003979 A EP 07003979A EP 07003979 A EP07003979 A EP 07003979A EP 1965132 A1 EP1965132 A1 EP 1965132A1
Authority
EP
European Patent Office
Prior art keywords
desuperheater
desuperheater according
pipe
stub
water
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.)
Withdrawn
Application number
EP07003979A
Other languages
English (en)
French (fr)
Inventor
Christian Fraikin
Jean-François Galopin
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.)
Cockerill Maintenance and Ingenierie SA
Original Assignee
Cockerill Maintenance and Ingenierie SA
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 Cockerill Maintenance and Ingenierie SA filed Critical Cockerill Maintenance and Ingenierie SA
Priority to EP07003979A priority Critical patent/EP1965132A1/de
Priority to AT08714493T priority patent/ATE492773T1/de
Priority to PCT/BE2008/000013 priority patent/WO2008104038A1/en
Priority to DE602008004103T priority patent/DE602008004103D1/de
Priority to EP08714493A priority patent/EP2115352B1/de
Publication of EP1965132A1 publication Critical patent/EP1965132A1/de
Withdrawn legal-status Critical Current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

Definitions

  • the present invention is related to an improved design for a desuperheater nozzle head in the field of steam generators and particularly heat recovery steam generators (HRSG).
  • HRSG heat recovery steam generators
  • the flow of hot gases coming out of the gas turbine is cooled down by water or steam circulating in or passing through the steam recovery cycle.
  • water enters the exchanger in the liquid phase at low temperature. It is then heated up in an economizer, then vaporized at constant temperature in an evaporator and at last superheated before to be directed to a steam turbine.
  • the temperature of the steam provided by the superheater is too high to safely enter the turbine.
  • a desuperheater also called attemperator, is thus an equipment that allows the cooling-down of the steam in boiler applications, by means of the injection of a cooling medium, cold or lukewarm water in the present case.
  • the cooling medium shall have a higher pressure to permit its injection, and in this particular case, the atomization of the water.
  • a desuperheater basically comprises a water pipe fed by a valve and terminated with a head equipped with a number of nozzles having a particular design.
  • the design may be foreseen so that the control valve is integrated to the piping or dissociated, i.e. located away from it.
  • a piston is actuated in a cylinder, resulting in the opening of a controlled number of water injection ports at the valve level.
  • a typical desuperheater head 10 goes through the wall of the steam flow line and is connected to it by a cylindrical stub 14, said head comprising a bulky cylindrical metal tube (of typical outer diameter 75 mm), with a number of ducts machined in it, said ducts being ended with a series of machined longitudinally disposed nozzles 7 and intended to be placed in such a way as to perform the water injection in the direction of the steam (see for example NL 194 346 C ).
  • the atomization of cold water transforms incoming pressurized water in a mist of saturated vapour so that a perfect mixing of the two fluids occurs, heat being transferred from water to vapour and inversely.
  • Desuperheater heads of prior art suffer from a number of drawbacks. In cycles where no desuperheating is needed, for some operative modes, there is no water flow in the head which may be maintained at a temperature of more than 550°C. However, when the desuperheater is in use, the head circulates "cold" water at a temperature of 100-280°C. This huge temperature difference can lead to a thermal shock with cracks possibly occurring on the injection head, either longitudinally, or on the circumference or at the nozzle welds.
  • the present invention aims to provide a solution to the drawbacks of prior art.
  • the invention aims at proposing a desuperheater head designed to prevent the problem of inevitable thermal expansion constraints.
  • the invention aims at proposing a desuperheater head designed so as to rapidly and uniformly dissipate the thermal shock inherent to the temperature difference between water and metal, when hot.
  • the invention pursues also the goal of preventing an accidental runaway of detached nozzle head parts to the steam pipe and further possible damage to the turbine.
  • the present invention relates to a desuperheater used in a steam generator, particularly in a heat recovery steam generator (HRSG), for producing spraywater in a steam pipe, comprising a control valve connected to a water-conveying means terminated by an injection nozzle located at an injection point within the steam pipe, characterized in that said water-conveying means is made of at least one metal duct not fixed at its nozzle end and free from bulky metal parts.
  • HRSG heat recovery steam generator
  • said water-conveying means comprises one or more thin metal tubes which, at the nozzle side, are enclosed in an injection head connected to the steam pipe external wall only by the intermediary of a pipe stub fixed on said external wall.
  • said injection head respectively comprises a top cap and a stub connector connected to the pipe stub at a remote place from the steam pipe.
  • the desuperheater of the invention comprises a tube support made of a massive bulky part, configured to offer, during operation, sufficient backward reaction force opposite to the water ejection force.
  • the injection head further comprises a skirt making an external envelope to the tubes up to their end in the stream pipe.
  • the skirt is exclusively connected to the stub connector, without any connection to the metal tubes, especially at their nozzle end.
  • the stub connector, the top cap and the skirt are made of thin metal sheet.
  • the stub connector and the top cap are configured to be pressure and temperature-resistant.
  • the diameter of the top cap is chosen large enough to accommodate thermal sleeves located externally on each tube at the place where the tube goes through the top cap.
  • the top cap, the stub connector, the pipe stub, the skirt and the massive bulky part are essentially revolution parts.
  • the massive bulky part is longitudinally machined so that to ensure passage and sliding of the tubes within it.
  • the skirt is configured so that no detached parts of the injection head can accidentally fall within the steam pipe.
  • a guiding device is intercalated in between the skirt and the pipe and/or the stub.
  • water injection is axial about the steam pipe, i.e. in the direction of the steam flow.
  • all connections are welds.
  • the injection nozzles can be of different shape, size and/or orientation.
  • FIG.1 represents an example of desuperheater bulky nozzle head according to
  • FIG.2A schematically represents a dissociated desuperheater installation according to prior art.
  • FIG.2B schematically represents an embodiment for a valve body of a desuperheater according to prior art.
  • FIG.2C schematically represents an embodiment for a nozzle assembly in a desuperheater according to prior art.
  • FIG.3 represents a preferred embodiment for a desuperheater nozzle head according to the present invention.
  • control valve 2 determines the water flow to be injected and the piping and injection point 3 on the steam flow line 1, which is located away from said valve.
  • the pipe(s) connect(s) the valve outlet(s) to an injection head welded or flanged to the piping.
  • the bottom part of the valve body 4 (stem 4A, plug 4B) is drilled in a number of locations 5.
  • the opening of the valve 2 allows the water to flow through the drilled holes 5 and therefore to feed the tubes 6.
  • Injection is performed through a nozzle assembly 7, located inside the steam pipe 1 and schematically shown on FIG.2C , preferably comprising a swirler 8 to ensure the rotation of water droplets in cooperation with the orifice to permit atomization of water whilst getting out.
  • the injection can either be radial (from the periphery towards the centre) or axial (in the direction of steam) about the steam pipe. Chosen geometry depends on the chosen flow factor kv, which may vary depending on the characteristic curve one ought to reach.
  • a series of thin tubes 6 (e.g. 12 mm outer diameter x 1,5 mm thick) are provided to flow water from the valve body 2 to each injection point 3.
  • a nozzle assembly 7 as described above is welded at each tube end.
  • connection of the injection head 10 to the steam piping 1 is performed thanks to a pipe stub 14, which is not considered as being a part of the injection head.
  • Injection head 10 as such is made of :

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Amplifiers (AREA)
  • Fats And Perfumes (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Pipeline Systems (AREA)
  • Nozzles (AREA)
EP07003979A 2007-02-27 2007-02-27 Enthitzer Withdrawn EP1965132A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP07003979A EP1965132A1 (de) 2007-02-27 2007-02-27 Enthitzer
AT08714493T ATE492773T1 (de) 2007-02-27 2008-02-25 Enthitzer
PCT/BE2008/000013 WO2008104038A1 (en) 2007-02-27 2008-02-25 Desuperheater
DE602008004103T DE602008004103D1 (de) 2007-02-27 2008-02-25 Enthitzer
EP08714493A EP2115352B1 (de) 2007-02-27 2008-02-25 Enthitzer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07003979A EP1965132A1 (de) 2007-02-27 2007-02-27 Enthitzer

Publications (1)

Publication Number Publication Date
EP1965132A1 true EP1965132A1 (de) 2008-09-03

Family

ID=38920708

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07003979A Withdrawn EP1965132A1 (de) 2007-02-27 2007-02-27 Enthitzer
EP08714493A Not-in-force EP2115352B1 (de) 2007-02-27 2008-02-25 Enthitzer

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP08714493A Not-in-force EP2115352B1 (de) 2007-02-27 2008-02-25 Enthitzer

Country Status (4)

Country Link
EP (2) EP1965132A1 (de)
AT (1) ATE492773T1 (de)
DE (1) DE602008004103D1 (de)
WO (1) WO2008104038A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010026116A1 (de) * 2010-07-05 2012-01-05 Tec Artec Valves Gmbh & Co. Kg Einspritzkühler
CN102506414A (zh) * 2011-11-02 2012-06-20 哈尔滨锅炉厂有限责任公司 600mw锅炉过热器减温器及减温方法
US11346545B2 (en) 2018-11-09 2022-05-31 Fisher Controls International Llc Spray heads for use with desuperheaters and desuperheaters including such spray heads
US11454390B2 (en) 2019-12-03 2022-09-27 Fisher Controls International Llc Spray heads for use with desuperheaters and desuperheaters including such spray heads

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10443837B2 (en) 2015-04-02 2019-10-15 Emerson Vulcan Holding Llc Desuperheater system
CN112432157B (zh) * 2020-11-18 2022-12-06 哈尔滨锅炉厂有限责任公司 一种减温水汽化程度的监测方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130611A (en) * 1976-12-06 1978-12-19 Yarway Corporation Attemperator
NL9301125A (nl) * 1993-06-29 1995-01-16 Narvik Valves B V Inspuitkoelsysteem, in het bijzonder voor het koelen van door een buisleiding stromende oververhitte stoom.
RU2066811C1 (ru) * 1993-01-12 1996-09-20 Производственное объединение "Красный котельщик" Впрыскивающий пароохладитель
US5607626A (en) * 1995-08-18 1997-03-04 Copes-Vulcan, Inc. Spring assisted multi-nozzle desuperheater
JP2005273952A (ja) * 2004-03-23 2005-10-06 Babcock Hitachi Kk 減温装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130611A (en) * 1976-12-06 1978-12-19 Yarway Corporation Attemperator
RU2066811C1 (ru) * 1993-01-12 1996-09-20 Производственное объединение "Красный котельщик" Впрыскивающий пароохладитель
NL9301125A (nl) * 1993-06-29 1995-01-16 Narvik Valves B V Inspuitkoelsysteem, in het bijzonder voor het koelen van door een buisleiding stromende oververhitte stoom.
US5607626A (en) * 1995-08-18 1997-03-04 Copes-Vulcan, Inc. Spring assisted multi-nozzle desuperheater
JP2005273952A (ja) * 2004-03-23 2005-10-06 Babcock Hitachi Kk 減温装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010026116A1 (de) * 2010-07-05 2012-01-05 Tec Artec Valves Gmbh & Co. Kg Einspritzkühler
EP2405195A3 (de) * 2010-07-05 2012-11-28 TEC artec valves GmbH & Co. KG Einspritzkühler
CN102506414A (zh) * 2011-11-02 2012-06-20 哈尔滨锅炉厂有限责任公司 600mw锅炉过热器减温器及减温方法
CN102506414B (zh) * 2011-11-02 2015-11-04 哈尔滨锅炉厂有限责任公司 600mw锅炉过热器减温器及减温方法
US11346545B2 (en) 2018-11-09 2022-05-31 Fisher Controls International Llc Spray heads for use with desuperheaters and desuperheaters including such spray heads
US11353210B2 (en) 2018-11-09 2022-06-07 Fisher Controls International Llc Spray heads for use with desuperheaters and desuperheaters including such spray heads
US11767973B2 (en) 2018-11-09 2023-09-26 Fisher Controls International Llc Spray heads for use with desuperheaters and desuperheaters including such spray heads
US11454390B2 (en) 2019-12-03 2022-09-27 Fisher Controls International Llc Spray heads for use with desuperheaters and desuperheaters including such spray heads

Also Published As

Publication number Publication date
ATE492773T1 (de) 2011-01-15
EP2115352A1 (de) 2009-11-11
WO2008104038A1 (en) 2008-09-04
DE602008004103D1 (de) 2011-02-03
EP2115352B1 (de) 2010-12-22

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