US3916843A - Buffer zone for counterflow preheater - Google Patents

Buffer zone for counterflow preheater Download PDF

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Publication number
US3916843A
US3916843A US433615A US43361574A US3916843A US 3916843 A US3916843 A US 3916843A US 433615 A US433615 A US 433615A US 43361574 A US43361574 A US 43361574A US 3916843 A US3916843 A US 3916843A
Authority
US
United States
Prior art keywords
wrapper
tubes
tubesheet
secondary fluid
flow distribution
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 - Lifetime
Application number
US433615A
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English (en)
Inventor
Robert R Bennett
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US433615A priority Critical patent/US3916843A/en
Priority to CA215,509A priority patent/CA988795A/en
Priority to DE19742459308 priority patent/DE2459308A1/de
Priority to GB3575A priority patent/GB1455541A/en
Priority to IT19033/75A priority patent/IT1028188B/it
Priority to BR39/75A priority patent/BR7500039A/pt
Priority to CH3675A priority patent/CH590427A5/xx
Priority to FR7500852A priority patent/FR2257859B1/fr
Priority to NL7500408A priority patent/NL7500408A/xx
Priority to ES433796A priority patent/ES433796A1/es
Priority to BE1006393A priority patent/BE824377A/xx
Priority to SE7500425A priority patent/SE402971B/xx
Priority to JP50006511A priority patent/JPS50101702A/ja
Application granted granted Critical
Publication of US3916843A publication Critical patent/US3916843A/en
Priority to JP1977170719U priority patent/JPS5351921Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/023—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group
    • F22B1/025—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group with vertical U shaped tubes carried on a horizontal tube sheet

Definitions

  • Baehr 57 ABSTRACT A steam generator having a U-shaped tube bundle, which extends upwardly from a tubesheet, and a wrapper encircling the tube bundle, a preheater disposed on the cool leg of the bundle and a distribution plate disposed between the tube sheet and the preheater to form a buffer zone, the buffer zone being effective to prevent cold influent feedwater entering the steam generator from channeling along the tubes and contacting the tubesheet.
  • a vapor generator which utilizes a primary heated fluid to vaporize a secondary fluid, when make in accordance with this invention, comprises a vertical shell portion, a tubesheet, a plurality of tubes through which theprimary fluid flows, a wrapper encircling the tubes and forming an annular chamber between the wrapper and the shell, a secondary fluid inlet nozzle, a preheater having an enclosure disposed on the tubesheet end thereof, a flow distribution plate disposed between the preheater and the tubesheet.
  • the flow distribution has a plurality of circulation openings disposed therein;
  • the flow'distribution plate is cooperatively associated with the-closure plate and the wrapper to form a buffer zone between the preheater and the tubesheet to prevent influent secondary fluid that is introduced into the preheater from channelling along the tubes and contacting the tubesheet.
  • FIG. Us a partial sectional view of a steam generator made in accordance with this invention.
  • FIG. 2 is an enlarged partialsectional view showing a preheater and buffer zone in detail
  • FIGS. 3, 4 and 5 are enlarged partial sectional views taken on lines III-III, lVIV and V V, respectively, in FIGS. 2 and 6;
  • FIG. 6 is a partial sectional view of an steam generator showing an alternate embodiment of this invention.
  • FIG. 1 shows a steam or vapor generator 1, which utilizes a U-shaped bundle of tubes 3 to provide the heating surface required to-transfer heat from a primary fluid to vaporize or boil a secondary fluid.
  • the steamgenerator 1 comprises a vessel 5 having a vertically oriented tubular shell portions 7 and an end closure or flanged and dished'head 9'enclosing one end of the shell,the upper end, and a spherical shaped channel head 11 enclosing the other end of the shell, the lower end.
  • a tubesheet 13 is made integral with the channel head 11 and has a plurality of holes 14 disposed therein to receive the ends of the U-shaped tubes 3.
  • a dividing plate 15 is centrally disposed in the channel head 11 to divide the channel head into two compartments 17 and 19, which serve as headers for the tubes 3.
  • the compartment on the. left, as shown in FIG; 1, is the primary fluid inlet compartment 17 and has aprimary fluid inlet nozzle 21 in communication therewith.
  • a secondary fluid or feedwater inlet nozzle 27 is disposed in the lower portion of the shell 7 adjacent the tube sheet 13 and has a thermal sleeve 29 disposed therein.
  • the tube bundle 3 is enclosed by a wrapper 31 which encircles the tube bundle and forms an annular chamber 33 adjacent the shell 7.
  • a preheater 35 is disposed within the shell 7 adjacent tubesheet 13.
  • the preheater 35 is disposed to enclose at least a portion of the tube bundles and comprises a portion of the wrapper 31, a vertical closure plate 37, a top end closure plate 39, and a lower end closure plate 41, which cooperate to enclose a portion of the cool leg to form the preheater 35.
  • Baffles 43 are disposed within the preheater 35 to cause the influent primary fluid to follow a sinuous path therethrough.
  • a flow distribution plate 45 is disposed between the lower enclosure plate 41 and the tubesheet 13. The flow distribution plate 45 cooperates with the end closure 41 and the wrapper 31 to form a buffer zone 47 which is closed on all sides except one. j
  • the flow distributor plate 45 has a plurality of large openings 49 surrounding each tube.
  • the openings 49 are sufficiently large to provide open area to allow the secondary fluid to flow from adjacent the tube sheet 13 into the buffer zone 47.
  • the end closure plate 41 has a plurality of holes 51 which tightly embrace the tubes 3.
  • the holes 51 are sized to provide just enough open area to allow the tubes to slide freely therethrough.
  • the top end closure plate 39 has a plurality of holes 53, which tightly embrace the tubes and a plurality of flow distribution holes 55 which allow the secondary fluid to flow from one side of the baffle to the other.
  • the flow distribution plate 45 is. generally circular generally covering the whole cross-section of the wrapper 31.
  • the flow distribution plate 45 has a semicircular portion through which the tubes forming the-hot leg 23 pass and the central portion of this semicircular section contains a large open area 57 which accommodates a plurality of the hot leg tubes 23 to prevent excessive boiling and low velocities adjacent the tubesheet 13 which causes chemical hideout and temperature excursionsthat have in the past produced premature tube failures.
  • the steam generator 1 also has means for separating water or secondary fluidfrom the steam or vapor disposed in the upper portion of the shell which has an enlarged cross-section.
  • means for separating water or secondary fluidfrom the steam or vapor disposed in the upper portion of the shell which has an enlarged cross-section.
  • the annular space33 between the wrapper 31 and the shell 7 provides a recirculation path for the secondary fluid removed from'the vapor by the moisture separation means disposed at the top of the vessel.
  • This recirculated secondary fluid flows downwardly to the area between the tubesheet and the flow distribution plate 45.'A portion of it flows upwardly through the opening 57 into the central portion of the hot leg sweeping the tubesheet and preventing boiling adjacent thereto; Another portion of this recirculated secondary fluid flows upwardly through the openings 49 into the buffer zone 47 because of the different size in the opening adjacent the tubesin the flow distribution plate 45 and the end closure plate 41.
  • the recirculating secondary fluid sweeps upwardly along the tubes and into the buffer zone preventing influent secondary fluid, which is introduced into the preheater and flows through the holes 51, from channeling along the tubes and reaching the tubesheet.
  • influent secondary fluid which is introduced into the preheater and flows through the holes 51, from channeling along the tubes and reaching the tubesheet.
  • the shell 7' is generally the same diameter throughout its length and a dividing plate 61 extendsupwardly from the tubesheet and cooperates with the wrapper 31 to form a steam or vapor end closure 63 forming a superheater portion around at least a portion of the hot leg portion 23 of the tube bundle 3.
  • the wrapper 31 has a plurality of openings 65 disposed therein and a plurality of closure strips 63 which causejthe preheated secondary fluid to flow through a portion of the annular chamber 33 to the area between the'tube'sheet and the flow distribution plate 45, which in FIG. 6 is generally semicircular and extends between the wrapper and the dividingplate 61. As can be best seen in FIG.
  • the dividing plate 45 has a plurality of large openings 49surrounding the tubes '3.
  • the openings are sufficiently large to allow area for the secondary fluid to flow upwardly therethrough into the buffer zone'47' while the lower closure plate 41 as shown in FIG. 4 has'a'plurality of holes which tightly embrace the tubes allowing only sufficient clearance for the plate to slide over the tubes.
  • the preheated secondary fluid flows across the cool leg portion of the tubesheet and upwardly through. the openings 49 into the buffer zone sweeping the tubes and preventing influent feedwater or secondary fluid from channeling along the tubes and contacting the tubesheet.
  • the preheated feedwater flows upwardly over the cool leg portion of the tube bundle 25, boils and becomes vapor or steam, it then follows a sinuous path over at least a portion of the hot leg portion of the tube bundle 23 to bereference in this come superheated vapor or steam and then'flow out- 4 water from contacting the tubesheet, excessive thermal stresses are prevented.
  • a vapor generator which utilizes a primary heated fluid to vaporize a secondary fluid, saidvapor generator comprising a vertical shell portion;.a tubesheet disposed adjacent -one end of. said shell; a tube bundle.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air Supply (AREA)
US433615A 1974-01-15 1974-01-15 Buffer zone for counterflow preheater Expired - Lifetime US3916843A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US433615A US3916843A (en) 1974-01-15 1974-01-15 Buffer zone for counterflow preheater
CA215,509A CA988795A (en) 1974-01-15 1974-12-09 Buffer zone for counterflow preheater
DE19742459308 DE2459308A1 (de) 1974-01-15 1974-12-14 Vertikaler dampfkessel
GB3575A GB1455541A (en) 1974-01-15 1975-01-02 Buffer zone for counterflow preheater
BR39/75A BR7500039A (pt) 1974-01-15 1975-01-03 Gerador de vapor
IT19033/75A IT1028188B (it) 1974-01-15 1975-01-03 Zona di transizione per preriscal datore in controcorrente
CH3675A CH590427A5 (xx) 1974-01-15 1975-01-06
FR7500852A FR2257859B1 (xx) 1974-01-15 1975-01-13
NL7500408A NL7500408A (nl) 1974-01-15 1975-01-14 Stoomgenerator.
ES433796A ES433796A1 (es) 1974-01-15 1975-01-14 Generador de vapor.
BE1006393A BE824377A (fr) 1974-01-15 1975-01-14 Zone tampon pour prechauffer a contre courant
SE7500425A SE402971B (sv) 1974-01-15 1975-01-15 Anggenerator
JP50006511A JPS50101702A (xx) 1974-01-15 1975-01-16
JP1977170719U JPS5351921Y2 (xx) 1974-01-15 1977-12-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US433615A US3916843A (en) 1974-01-15 1974-01-15 Buffer zone for counterflow preheater

Publications (1)

Publication Number Publication Date
US3916843A true US3916843A (en) 1975-11-04

Family

ID=23720834

Family Applications (1)

Application Number Title Priority Date Filing Date
US433615A Expired - Lifetime US3916843A (en) 1974-01-15 1974-01-15 Buffer zone for counterflow preheater

Country Status (13)

Country Link
US (1) US3916843A (xx)
JP (2) JPS50101702A (xx)
BE (1) BE824377A (xx)
BR (1) BR7500039A (xx)
CA (1) CA988795A (xx)
CH (1) CH590427A5 (xx)
DE (1) DE2459308A1 (xx)
ES (1) ES433796A1 (xx)
FR (1) FR2257859B1 (xx)
GB (1) GB1455541A (xx)
IT (1) IT1028188B (xx)
NL (1) NL7500408A (xx)
SE (1) SE402971B (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057033A (en) * 1975-08-08 1977-11-08 The Babcock & Wilcox Company Industrial technique
US4554889A (en) * 1984-06-22 1985-11-26 Westinghouse Electric Corp. Hybrid preheat/recirculating steam generator
US5419391A (en) * 1991-04-05 1995-05-30 Westinghouse Electric Corporation Steam generator with axial flow preheater
WO2012139139A1 (en) * 2011-04-04 2012-10-11 Westinghouse Electric Company, Llc Steam generator tube lane flow buffer
US20140116360A1 (en) * 2012-10-31 2014-05-01 Westinghouse Electric Company Llc Method and apparatus for securing tubes in a steam generator against vibration
US9697919B2 (en) 2010-12-29 2017-07-04 Westinghouse Electric Company, Llc Anti-vibration tube support plate arrangement for steam generators
US20180306519A1 (en) * 2015-10-21 2018-10-25 Technip France Device for the exchange of heat between a first fluid intended to be vaporized and a second fluid intended to be cooled and/or condensed, and associated installation and method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2394750A1 (fr) * 1977-06-15 1979-01-12 Commissariat Energie Atomique Generateur de vapeur
FR2520847A1 (fr) * 1982-02-04 1983-08-05 Framatome Sa Generateur de vapeur a faisceau de tubes en u et a surchauffe
JP6007241B2 (ja) * 2011-08-04 2016-10-12 ウエスチングハウス・エレクトリック・カンパニー・エルエルシー チューブアンドシェル型蒸気発生器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3483848A (en) * 1967-12-01 1969-12-16 Ramona Bernice Green Vapor generator with integral economizer
US3547084A (en) * 1969-12-12 1970-12-15 Babcock & Wilcox Co Vapor generator with integral economizer
US3576179A (en) * 1969-12-24 1971-04-27 Combustion Eng Economizer for shell-and-tube steam generator
US3804069A (en) * 1972-02-09 1974-04-16 Westinghouse Electric Corp Steam generator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3483848A (en) * 1967-12-01 1969-12-16 Ramona Bernice Green Vapor generator with integral economizer
US3547084A (en) * 1969-12-12 1970-12-15 Babcock & Wilcox Co Vapor generator with integral economizer
US3576179A (en) * 1969-12-24 1971-04-27 Combustion Eng Economizer for shell-and-tube steam generator
US3804069A (en) * 1972-02-09 1974-04-16 Westinghouse Electric Corp Steam generator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057033A (en) * 1975-08-08 1977-11-08 The Babcock & Wilcox Company Industrial technique
US4554889A (en) * 1984-06-22 1985-11-26 Westinghouse Electric Corp. Hybrid preheat/recirculating steam generator
US5419391A (en) * 1991-04-05 1995-05-30 Westinghouse Electric Corporation Steam generator with axial flow preheater
US9697919B2 (en) 2010-12-29 2017-07-04 Westinghouse Electric Company, Llc Anti-vibration tube support plate arrangement for steam generators
WO2012139139A1 (en) * 2011-04-04 2012-10-11 Westinghouse Electric Company, Llc Steam generator tube lane flow buffer
CN103534549A (zh) * 2011-04-04 2014-01-22 西屋电气有限责任公司 蒸汽发生器管廊流缓冲件
CN103534549B (zh) * 2011-04-04 2016-07-06 西屋电气有限责任公司 蒸汽发生器管廊流缓冲件
US9534779B2 (en) 2011-04-04 2017-01-03 Westinghouse Electric Company Llc Steam generator tube lane flow buffer
US20140116360A1 (en) * 2012-10-31 2014-05-01 Westinghouse Electric Company Llc Method and apparatus for securing tubes in a steam generator against vibration
US20180306519A1 (en) * 2015-10-21 2018-10-25 Technip France Device for the exchange of heat between a first fluid intended to be vaporized and a second fluid intended to be cooled and/or condensed, and associated installation and method
US11686531B2 (en) * 2015-10-21 2023-06-27 Technip Energies France Device for the exchange of heat between a first fluid intended to be vaporized and a second fluid intended to be cooled and/or condensed, and associated installation and method

Also Published As

Publication number Publication date
FR2257859B1 (xx) 1979-01-05
GB1455541A (en) 1976-11-10
FR2257859A1 (xx) 1975-08-08
SE7500425L (xx) 1975-07-16
JPS5395001U (xx) 1978-08-02
JPS5351921Y2 (xx) 1978-12-12
CH590427A5 (xx) 1977-08-15
SE402971B (sv) 1978-07-24
NL7500408A (nl) 1975-07-17
IT1028188B (it) 1979-01-30
JPS50101702A (xx) 1975-08-12
DE2459308A1 (de) 1975-07-17
ES433796A1 (es) 1976-12-01
CA988795A (en) 1976-05-11
BR7500039A (pt) 1975-11-04
BE824377A (fr) 1975-07-14

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