WO2015088541A1 - Désurchauffeur avec mesure du débit - Google Patents

Désurchauffeur avec mesure du débit Download PDF

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Publication number
WO2015088541A1
WO2015088541A1 PCT/US2013/074771 US2013074771W WO2015088541A1 WO 2015088541 A1 WO2015088541 A1 WO 2015088541A1 US 2013074771 W US2013074771 W US 2013074771W WO 2015088541 A1 WO2015088541 A1 WO 2015088541A1
Authority
WO
WIPO (PCT)
Prior art keywords
liner
steam
desuperheater
pipe
conduit
Prior art date
Application number
PCT/US2013/074771
Other languages
English (en)
Inventor
Tord Forslund
Original Assignee
Control Components, Inc.
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 Control Components, Inc. filed Critical Control Components, Inc.
Priority to PCT/US2013/074771 priority Critical patent/WO2015088541A1/fr
Priority to EP13899079.1A priority patent/EP3080515B1/fr
Publication of WO2015088541A1 publication Critical patent/WO2015088541A1/fr

Links

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 pertains generally to steam desuperheaters and, more particularly, to a steam desuperheater which it outfitted with a differential pressure transmitter operative to provide a measurement of steam flow through the desuperheater.
  • Desuperheating refers to the process of reducing the temperature of the superheated steam to a lower temperature, permitting operation of the system as intended, ensuring system protection, and correcting for unintentional amounts of superheat.
  • a steam desuperheater can lower the temperature of superheated steam by spraying cooling water into the flow of superheated steam passing through a steam pipe. Once the cooling water is sprayed into the flow of superheated steam, the cooling water mixes with the superheated steam and evaporates, drawing thermal energy from the steam and lowering its temperature.
  • currently known steam desuperheaters typically comprise a segment of steam pipe which is integrated into a steam line.
  • the steam pipe of the desuperheater has one or more water atomizing nozzles attached thereto. The nozzles are connected to a common spray water pipe connection.
  • the spray water flow is controlled by a separate spray water control valve.
  • a liner is installed in the steam pipe to improve the system turndown or to protect the steam line.
  • a steam desuperheater which is integrated into a steam line.
  • the steam desuperheater comprises a segment of steam pipe having one or more spring loaded spray nozzles attached thereto.
  • the nozzles are connected to a common spray water pipe connection, with the flow of water being controlled by a separate spray water valve.
  • the nozzles, the spray water pipe connection, and the spray water valve are components of a spray water sub-assembly of the desuperheater.
  • Installed within the interior of the steam pipe of the desuperheater is a liner which is adapted to optimize the performance of the desuperheater.
  • the liner acts like a nozzle as makes it suitable for use in relation to the steam flow measurement principles of the present invention.
  • the desuperheater of the present invention is also provided with a steam flow measurement sub-assembly.
  • This steam flow measurement sub-assembly comprises a differential pressure transmitter including a pair of pressure gauges which are operatively connected to respective ones of a first pressure tapping which is formed in the steam pipe before the liner, and a second pressure tapping which is formed in the liner.
  • the measurement of the differential pressure allows for a determination of steam flow through the desuperheater.
  • the steam flow measurement sub-assembly further preferably comprises pressure and temperature transmitters which are installed in the steam line upstream of the desuperheater for providing a density determination that is also required for the steam flow determination.
  • the pressure gauges and associated pressure tappings of the steam flow measurement sub-assembly may be provided as original components of the desuperheater operatively interfaced to the steam pipe and liner thereof, or alternatively may be provided as part of a stand-alone steam flow measurement system which is adapted to be retrofitted to an existing desuperheater.
  • Figure 1 is a side elevational view of an exemplary steam line having a steam desuperheater and a steam flow measurement system constructed in accordance with the present invention integrated therein;
  • Figure 2 is a cross-sectional view of the desuperheater shown in Figure 1, illustrating the liner integrated into the steam pipe of the desuperheater and the pressure gauges of the steam flow measurement system as operatively connected to the steam pipe and the liner;
  • Figure 3 is an enlargement of a portion of the desuperheater shown in Figure
  • Figure 4 is an end view of the desuperheater taken along line 4-4 of Figure 2;
  • Figure 5 is a perspective view of the desuperheater shown in Figure 2;
  • Figure 6 is a cross-sectional view of an exemplary spray nozzle which may be integrated into a spray water sub-assembly of the desuperheater.
  • Common reference numerals are used throughout the drawings and detailed description to indicate like elements.
  • Figure 1 depicts a steam desuperheater 10 as integrated into an existing steam line 12.
  • the desuperheater 10, as separated from the steam line 12, is shown in Figures 2, 4 and 5.
  • the direction of steam flow through the desuperheater 10 is designated by the arrows shown in Figures 1 and 2.
  • the desuperheater 10 comprises a tubular segment of steam pipe 14 which has a generally circular, cross-sectional configuration.
  • the steam pipe 14 is of a prescribed length, and defines an outer surface 16 and an inner surface 18 (which itself defines a pipe conduit).
  • the steam pipe 14 defines an inlet end 20 and an outlet end 22.
  • the desuperheater 10 comprises a tubular liner 24 which is disposed (i.e., concentrically positioned) within the interior of the steam pipe 14, and itself has a generally circular cross- sectional configuration.
  • the liner 24 is of a prescribed length, and defines an inner surface 26 (which itself defines a liner conduit) and an outer surface 28.
  • the liner 24 also defines an outwardly flared inlet end 30, and an opposed outlet end 32.
  • the distal rim defined by the outwardly flared inlet end 30 preferably abuts the inner surface 18 of the steam pipe 14.
  • the remainder of the outer surface 28 of the liner 24 is disposed in spaced relation to the inner surface 18 of the steam pipe 14.
  • the majority of the length of the outer surface 28 of the liner 24 is spaced from the inner surface 18 of the steam pipe 14 by an annular gap 34.
  • the liner 24 is preferably outfitted with a support ring 36 which fills the gap 34 between portions of the outer and inner surfaces 28, 18, and is located proximate the outlet end 32.
  • the flared inlet end 30 of the liner 24 prevents steam flow into the gap 34, and instead facilitates the channeling of such flow into the remainder of the liner 24, the inner diameter of which is less than that of the steam pipe 14 as indicated above.
  • a more comprehensive discussion of desuperheater liners such as the liner 24 is included in Applicant's U.S. Patent Publication No. 2009/0065295 (entitled Desuperheater Muffler), the disclosure of which is incorporated herein by reference.
  • the desuperheater 10 further comprises a spray water sub-assembly 38 which is operatively connected to the steam pipe, as well as the liner 24 within the steam pipe 14.
  • the spray nozzle sub-assembly 38 comprises a control valve 40 which is fluidly connected to a cooling water feed line (not shown). Fluidly connected to the control valve 40 is a spray water pipe 42 which, as most apparent from Figure 4, is segregated into an identically configured pair of segments which extend from the control valve 40 in opposed relation to each other. Fluidly connected to those ends of the spray water pipe 42 opposite those directly attached to the control valve 40 are respective ones of an identically configured pair of spring-loaded spray nozzle assemblies 44 of the spray-water sub assembly 38, one of which is shown with particularity in Figure 6.
  • each spray nozzle assembly 44 extends through the steam pipe 14, gap 34 and liner 24 into the interior of the liner 24, with those portions of the spray nozzle assemblies 44 protruding into the interior or liner conduit of the liner 24 being diametrically opposed to each other (i.e., separated by an interval of approximately 180°).
  • the control valve 40 regulates the flow of cooling water into the spray water pipe 42, typically in response to a signal from a temperature sensor mounted in the interior of the steam line 12 downstream of the spray nozzle assemblies 44.
  • the pressurization of the spray nozzle assemblies 44 resulting from the opening of the control valve 40 facilitates the movement of the spray nozzle assemblies 44 from a closed position to which they are normally biased to an open position, thus providing a spray of cooling water into the interior of the liner 24 in order to reduce the temperature of superheated steam flowing therethrough as a result of evaporation of the cooling spray water within the steam flow.
  • each spray nozzle assembly 44 includes a nozzle holder 46 which resides within a nozzle housing 48, and a spray nozzle 50 which is cooperatively engaged to the nozzle holder 46.
  • the desuperheater 10 further comprises a steam flow measurement sub- assembly 52.
  • the steam flow measurement sub-assembly 52 comprises a differential pressure transmitter 53 including first and second pressure gauges 54, 56.
  • the first pressure gauge 54 is operatively connected to a first pressure tapping 58 which is disposed within the steam pipe 14 before (i.e., upstream) of the liner 24. As such, the first pressure gauge 54 is in fluid communication with that portion of the interior of the steam pipe 14 which extends between the inlet end 20 and the inlet end 30 of the liner 24.
  • the second pressure gauge 56 is operatively connected to a second pressure tapping 60 which is formed in the liner 24 between the spray nozzle assemblies 44 interfaced thereto and the outlet end 32 thereof, the second pressure gauge 56 thus fluidly communicating with the interior of the liner 24 between the spray nozzle assemblies 44 and the outlet end 32.
  • the measurement of the differential pressure using measurements taken from the first and second pressure gauges 54, 56 allows for a determination of steam flow through the desuperheater 10.
  • the steam flow measurement sub-assembly 52 further preferably comprises a pressure transmitter 62 and a temperature transmitter 64 which are each installed in the steam line 22 upstream of the desuperheater 10 for providing a density determination that is also required for the steam flow determination.
  • first and second pressure gauges 54, 56 (and corresponding first and second pressure tappings 58, 60) of the steam flow measurement sub-assembly 52 may be provided as original components of the desuperheater 10 operatively interfaced to the steam pipe 14 and liner 24 thereof, or alternatively may be provided as part of a stand-alone steam flow measurement system which is adapted to be retrofitted to an existing desuperheater.
  • first and second pressure gauges 54, 56 and corresponding first and second pressure tappings 58, 60 are provided as original components or are adapted for retrofit application
  • those of ordinary skill in the art will further recognize that the upstream pressure and temperature transmitter 62, 64 of the steam flow measurement sub-assembly 52 or stand-alone steam flow measurement system will be retrofit to the existing steam line 12 proximate the steam pipe 14 of the desuperheater 10 integrated therein.
  • the functionality of the steam flow measurement sub-assembly 52 as integrated into the desuperheater 10, wherein steam flow is determined by measuring the differential pressure over the desuperheater 10 using measurements taken from the first and second pressure gauges 54, 56, as well as the upstream pressure and temperature transmitter 62, 64, may be calculated with the following equation:
  • the differential pressure is the measured pressure based on the measurements taken by the first and second pressure gauges 64, 56.
  • the specific volume is determined by measuring pressure and temperature upstream of the desuperheater 10 using the aforementioned pressure and temperature gauges 62, 64, and then using a steam table to provide the specific volume. All other data is depending on the specific design of the desuperheater 10. Along these lines, data for differing designs of the desuperheater 10 is provided by the examples set forth below.
  • Example 3 7.5 bar implementation:
  • the creation of a region of increased steam velocity where the cooling water is injected in a desuperheater helps to establish more robust contact between the steam and the cooling water, improving the efficiency of the desuperheating process.
  • the selective manipulation of the size or inner diameter of the liner 24 may be used to facilitate the creation of a venturi-like increase in steam velocity as may be used to optimize the performance of the desuperheater 10.
  • the steam flow measurement sub-assembly 52 of the desuperheater 10 may further be effectively used as a modality in determining an optimal inner diameter dimension for the liner 24.
  • the inner diameter of the steam pipe of the desuperheater 10 is about 304.7 mm and the desuperheater 10 is outfitted with a liner 24 having an inner diameter of about 206.4 mm, a steam velocity of about 39.91 m/s entering the liner 24 will be increased to about 85.99 m/s through the liner 24.
  • the pressure drop over the desuperheater 10 as determined by the steam flow measurement sub-assembly 52 would be about 0.1413 bar.
  • a reduction in the inner diameter of the liner 24 to about 183.9 mm would facilitate an increase in the steam velocity through the liner 24 from the same initial entry level of about 39.91 m/s to about 109.6 m/s, with the measured pressure drop over the desuperheater 10 as determined by the steam flow measurement sub-assembly 52 being doubled from the aforementioned level to about 0.2828 bar.
  • the measurements provided by the steam flow measurement subassembly 52 of the desuperheater 10 may be used as a basis for maximizing the operational efficiency of the desuperheater 10 by allowing for a selective adjustment in the inner diameter dimension of the liner 24, i.e., the diameter of the liner conduit defined by the liner 24.
  • an attemperator such as the desuperheater 10 which is integrated into the steam pipe 14 will create a pressure drop since the components of the desuperheater 10 (or other attemperator) will impart some level of resistance to steam flow through the steam pipe 14.
  • Any flow meter integrated into the steam pipe 14 will also create a pressure drop since it, like the attemperator or desuperheater 10, defines a resistance creating obstacle within the steam flow.
  • pressure drops are created in two places, providing a total pressure drop measurement value.
  • this provides the advantage of higher relative velocity between the steam in the liner 24 and the water droplets exiting the spray nozzle assemblies 44 of the spray water subassembly 38, and thus better secondary atomizing and shorter evaporation time of the water droplets. Further, higher rangeability is provided by achieving the same pressure drop as would otherwise result from an attemperator/flow meter combination using the desuperheater 10 alone.
  • This disclosure provides exemplary embodiments of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Volume Flow (AREA)
  • Control Of Turbines (AREA)

Abstract

L'invention concerne un désurchaffeur de vapeur qui est intégré dans une conduite de vapeur. Le désurchauffeur de vapeur comprend un segment de tuyau de vapeur ayant une ou plusieurs buses de pulvérisation à ressort qui lui sont attachées. Un chemisage est installé à l'intérieur du tuyau de vapeur du désurchauffeur. Le désurchauffeur est également équipé d'un sous-ensemble de mesure du débit de vapeur qui comprend un émetteur de pression différentielle incluant une paire de manomètres qui sont raccordés fonctionnels à des prises respectives parmi une première prise manométrique qui est formée dans le tuyau de vapeur avant le chemisage et une seconde prise manométrique qui est formée dans le chemisage.
PCT/US2013/074771 2013-12-12 2013-12-12 Désurchauffeur avec mesure du débit WO2015088541A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2013/074771 WO2015088541A1 (fr) 2013-12-12 2013-12-12 Désurchauffeur avec mesure du débit
EP13899079.1A EP3080515B1 (fr) 2013-12-12 2013-12-12 Désurchauffeur avec mesure du débit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2013/074771 WO2015088541A1 (fr) 2013-12-12 2013-12-12 Désurchauffeur avec mesure du débit

Publications (1)

Publication Number Publication Date
WO2015088541A1 true WO2015088541A1 (fr) 2015-06-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2013/074771 WO2015088541A1 (fr) 2013-12-12 2013-12-12 Désurchauffeur avec mesure du débit

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EP (1) EP3080515B1 (fr)
WO (1) WO2015088541A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018117957A1 (fr) * 2016-12-22 2018-06-28 Cci Valve Technology Ab Désurchauffeur et utilisation associée
WO2020222691A1 (fr) * 2019-05-01 2020-11-05 Bvt Sweden Ab Système de refroidissement pour une installation à base de vapeur et procédé d'assemblage d'un tel système de refroidissement
CN114017768A (zh) * 2021-11-25 2022-02-08 神华国华寿光发电有限责任公司 一种减温装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421761A (en) * 1941-10-10 1947-06-10 Babcock & Wilcox Co Attemperator
US3134367A (en) * 1957-07-31 1964-05-26 Siemens Ag Regulating system for once-through boilers
US3244898A (en) * 1959-12-29 1966-04-05 Combustion Eng Power plant system and control therefor
US4909445A (en) * 1987-08-24 1990-03-20 Steam Systems And Service Incorporated Desuperheat flow nozzle
US5439619A (en) * 1993-12-09 1995-08-08 Keystone International Holdings Corp. Steam conditioning butterfly valve
US20110298141A1 (en) * 2010-06-03 2011-12-08 Spx Corporation Desuperheater seat-ring apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1576833B2 (de) * 1966-09-28 1976-05-20 AB Källe-Regulatorer, Säffle (Schweden) Vorrichtung zum steuerbaren einfuehren von kuehlwasser in eine ueberhitzten dampf fuehrende leitung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421761A (en) * 1941-10-10 1947-06-10 Babcock & Wilcox Co Attemperator
US3134367A (en) * 1957-07-31 1964-05-26 Siemens Ag Regulating system for once-through boilers
US3244898A (en) * 1959-12-29 1966-04-05 Combustion Eng Power plant system and control therefor
US4909445A (en) * 1987-08-24 1990-03-20 Steam Systems And Service Incorporated Desuperheat flow nozzle
US5439619A (en) * 1993-12-09 1995-08-08 Keystone International Holdings Corp. Steam conditioning butterfly valve
US20110298141A1 (en) * 2010-06-03 2011-12-08 Spx Corporation Desuperheater seat-ring apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018117957A1 (fr) * 2016-12-22 2018-06-28 Cci Valve Technology Ab Désurchauffeur et utilisation associée
US10704784B2 (en) 2016-12-22 2020-07-07 Cci Valve Technology Ab Attemperator and a use of a such
WO2020222691A1 (fr) * 2019-05-01 2020-11-05 Bvt Sweden Ab Système de refroidissement pour une installation à base de vapeur et procédé d'assemblage d'un tel système de refroidissement
CN114017768A (zh) * 2021-11-25 2022-02-08 神华国华寿光发电有限责任公司 一种减温装置

Also Published As

Publication number Publication date
EP3080515B1 (fr) 2019-11-06
EP3080515A1 (fr) 2016-10-19
EP3080515A4 (fr) 2017-07-12

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