US3802489A - Regenerative air preheater with stationary cylindrical regenerative chamber - Google Patents

Regenerative air preheater with stationary cylindrical regenerative chamber Download PDF

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Publication number
US3802489A
US3802489A US00254420A US25442072A US3802489A US 3802489 A US3802489 A US 3802489A US 00254420 A US00254420 A US 00254420A US 25442072 A US25442072 A US 25442072A US 3802489 A US3802489 A US 3802489A
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United States
Prior art keywords
regenerative chamber
regenerative
hood
diameter
neck portion
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
US00254420A
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English (en)
Inventor
F Kirchhoff
E Kraft
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.)
Apparatebau Rothemuehle Brandt and Kritzler GmbH
Original Assignee
Apparatebau Rothemuehle Brandt and Kritzler GmbH
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Publication date
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Publication of US3802489A publication Critical patent/US3802489A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • F28D17/04—Distributing arrangements for the heat-exchange media
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/009—Heat exchange having a solid heat storage mass for absorbing heat from one fluid and releasing it to another, i.e. regenerator
    • Y10S165/037—Heat exchange having a solid heat storage mass for absorbing heat from one fluid and releasing it to another, i.e. regenerator having flow diverting means, e.g. valve to selectively control flow through storage mass
    • Y10S165/038—Correlated control of plural diverting means
    • Y10S165/039—Synchronously rotated flow guiding hoods disposed on opposite sides of fixed regenerator

Definitions

  • One of said hoods is surrounded by the air withdrawing passage whereas the other 'one of said hoods is surrounded by the air in-feeding passage, the diameter of the central circular neck cross section of the rotary hood at the flue gas discharge side amounting to from 0.35 to 0.5 times the diameter of the regenerative chamber whereas the axial height of said rotary hood amounts to from 0.2 to 0.3 times the diameter of the regenerative chamber.
  • the present invention relates to a regenerative air preheater with stationary cylindrical regenerative chamber which follow a steam generator and in which the flue gases in a manner known per se flow through the stationary regenerative chamber via rotatable hoods which at their end faces rotate coaxially and synchronously.
  • One of the hoods is on all sides surrounded by the air feeding passage whereas the other one of the hoods is on all sides surrounded by the air discharging passage.
  • This flue gas flow amounts at the exit cross section of the regenerative chamber approximately to 8 m/sec, and over the relatively short flow path in the vicinity of the neck cross section of the cold end rotatable hood it is slowed downto approximately 2.5 m/sec.
  • the velocity of the cold air flow which is substantially directed in opposite direction in this rotatable hood is on the average twice as high. At the neck cross section of the cold end hood the velocity amounts to approximately 15 m/sec and is slowed down to about m/sec up to the regenerator end face.
  • the invention is furthermore based on the finding that when providing the regenerative air preheaters with a stationary regenerative chamber and rotating air hoods within the stationary flue gas connecting passages, the arrangement of the air connecting passages so as to extend into the flue gas passages may from a structural standpoint be unfavorable and may interfere with the uniform distribution of the flue gases within the heating surfaces. As a result thereof, unilateral soiling of the heating surfaces and pulsation of the combustion air may result.
  • FIG. 1 shows a prior art regenerative air preheater with stationary regenerative chamber.
  • FIG. 2 diagrammatically illustrates a regenerative air preheater according to the present invention as connected to a steam generator with vertical exit of the flue gases.
  • the regenerative air preheater according to the present invention is characterized primarily in that the flue gases pass through the stationary regenerative chamber through rotatable hoods which at their end faces rotate coaxially and synchronously, one of these hoods being surrounded on all sides by the air feeding passage while the other one of these hoods is surrounded on all sides by the air withdrawing passage, the arrangement being such that the diameter of the central cylindrical neck cross section of the rotatable hood at the flue gas discharge side amounts to 0.35 to 0.5 times the diameter of the regenerative chamber whereas its axial height amounts to from 0.2 to 0.3 times the diameter of the regenerative chamber.
  • the axial height of the stationary flue gas passages adjacent the central neck cross sections of the rotatable hoods is less than 0.4'times the diameter of the regenerative chamber.
  • the flue gas passage on the gas on-flow side may be completely omitted.
  • the gas inlet hood may merely by the interposition of an expansion diaphragm be directly connected to the exit cross section of the last boiler flue path.
  • the stationary air feeding passage 6 which follows the upper neck cross section of the cold air hood 2 is horizontally in the direction perpendicular to the drawing plane of FIG. 1 introduced into the flue gas exit passage and within the height 0.4 D is in axial direction deviated downwardly.
  • the axial overall height of this passage arrangement between the upper edge of the air feeding passage 6 and the lower edge of the air discharge passage is designated with the character H,,.
  • the cooled off flue gases flow when leaving the regenerator end face at a velocity of approximately 8 m/sec in the direction of the arrow 8 and slow down in the vicinity of the neck cross section of the cold air rotatable hood, where the arrow 9 is shown, to approximately 2.5 m/sec.
  • the air which within the cold air hood flows downwardly has in the neck cross section the medium inlet velocity of approximately m/sec as indicated by the magnitude of the arrow 10. This velocity slows down on its way toward the upper end face of the regenerative chamber to approximately 5 m/sec as it is indicated by the relative magnitude of the arrow 11.
  • FIG. 2 The reversal according to the present invention and the structurally more favorable design of the channel means for conveying the heat exchanging media as well as the acceleration of the gas flow obtained thereby within the region of the cold end rotatable hood are illustrated in FIG. 2.
  • the cooled off flue gases pass in the direction of the arrow 12 approximately at a velocity of 8 m/sec from the end face of the regenerative chamber 12a and are accelerated in the cold end hood 2 up to a velocity of m/s in the direction of the arrow 13 within the neck cross section of this hood.
  • the warm flue gasses having a medium temperature of approximately 160C flow in contrast to the flow conditions of heretofore known customary designs, at a considerably higher medium velocity and at accelerated flow along the walls of the cold end hood.
  • the new arrangement according to the present invention thus makes it possible by correspondingly dimensioning the neck cross section diameter D, of the cold end hood greatly to increase the heat transfer coefficient between flue gas and wall and thereby the medium wall temperature in the corrosion endangered region so that, as a rule, no drop below the dew point will occur.
  • the arrows 14 in FIG. 2 and 15 in FIG. 1 indicate the downwardly directed air velocities in the air feeding passage outside the cold end hood which air velocities increase from approximately 3 m/sec to approximately 6 m/sec at the entrance into the regenerator end face.
  • the reference numeral 3 indicates an expansion diaphragm.
  • the present invention makes it possible with shorter smokestacks, and in particular with boilers in ships, to
  • the most important advantage inherent to the present invention consists in the increase of the medium wall temperature of the cold end hood whereby a drop below the dew point will be avoided and the corrosion resistant expensive steel materials heretofore employed for the manufacture of cold end hoods as well as the heat protective covers will no longer be needed.
  • the pipe means 1 may be omitted and the neck portion of the hood means 2a may be connected directly to the adjacent pass or flue of the steam generator 16 with the expansion diaphragm 3 interposed therebetween.
  • a regenerative air preheater with a stationary cylindrical regenerative chamber follows a steam generator 16; the regenerative air preheater includes the stationary cylindrical regenerative chamber 12a, first rotatable hood means 1 arranged at one end face of the regenerative chamber for communication with the steam generator 16 and for receiving flue gases therefrom and conveying the same into the regenerative chamber; also included are the second rotatable hood means 2 rotatably arranged at the other end face of the regenerative chamber in coaxial arrangement with the first hood means 1 and adapted to receive flue gases from the regenerative chamber 12a.
  • the second hood means 2 decreases in diameter in the direction away from the regenerative chamber 12a and has a neck portion defining the discharge opening of the second hood means 2.
  • flue gas discharge conduit means communicating with the neck portion; the diameter of the neck portion amounts to from 0.35 to 0.5 times the diameter of the regenerative chamber 12a; the axial height of the second hood means to from .02 to 0.3 times the diameter of the regenerative chamber 12a.
  • the cross-sectional portion that becomes connected with the gas hood is one-half of the regenerator face surface or more. 1
  • a regenerative air preheater which includes in combination: a stationary cylindrical regenerative chamber, first rotatable hood means arranged at one end face of said regenerative chamber for communication with a steam generator with a vertical exhaust of smoke gases postconnected therewith and for receiving flue gases therefrom and conveying the same into said regenerative chamber, second rotatable hood means rotatably arranged at the other end face of said regenerative chamber in coaxial arrangement with said first hood means and adapted to receive flue gases from said regenerative chamber, air discharge conduit means surrounding one of said hood means, air feed-in conduit means surrounding the other one of said hood means, said second hood means decreasing in diameter in the direction away from said regenerative chamber and having a neck portion defining the discharge opening of said second hood means, and flue gas discharge conduit means communicating with said neck portion, the diameter of said neck portion amounting to from 0.35 to 0.5 times the diameter of said regenerative chamber, and the axial height of said second hood means amounting to from 0.2 to
  • a regenerative air preheater in combination according to claim I in which said first hood means decreases in diameter in a direction away from said regenerative chamber and has a neck portion defining the flue gas inlet of said first hood means, first pipe means connected to said neck portion of said first hood means for connection to a steam generator and second pipe means connected to and interposed between said neck portion of said second hood means and said flue gas discharge conduit means, the height of said first and second pipe means being less than 0.4 times the diameter of said regenerative chamber to permit acceleration in velocity of flowing off flue gases and to bring about an increased self-cleaning due to less height.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)
US00254420A 1971-05-18 1972-05-18 Regenerative air preheater with stationary cylindrical regenerative chamber Expired - Lifetime US3802489A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2124584A DE2124584C3 (de) 1971-05-18 1971-05-18 Regenerativ-Luftvorwärmer mit stationärer zylindrischer Regenerativ-Kammer

Publications (1)

Publication Number Publication Date
US3802489A true US3802489A (en) 1974-04-09

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ID=5808215

Family Applications (1)

Application Number Title Priority Date Filing Date
US00254420A Expired - Lifetime US3802489A (en) 1971-05-18 1972-05-18 Regenerative air preheater with stationary cylindrical regenerative chamber

Country Status (6)

Country Link
US (1) US3802489A (enExample)
DE (1) DE2124584C3 (enExample)
ES (1) ES403156A1 (enExample)
FR (1) FR2137962B1 (enExample)
GB (1) GB1389303A (enExample)
IT (1) IT984585B (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509583A (en) * 1982-10-21 1985-04-09 Apparatebau Rothemuhle Brandt & Kritzler Gesellschaft Mit Beschrankter Haftung Apparatus for regenerative flue gas heat exchanger
US5397548A (en) * 1991-03-28 1995-03-14 Apparatebau Rothemuhle Brandt & Kritzler Gesellschaft mit besehrankter Haftung Regenerative heat exchanger
US5535813A (en) * 1995-05-26 1996-07-16 Abb Air Preheater, Inc. Offset support-pedestal housing panel
US20110303135A1 (en) * 2010-06-14 2011-12-15 Alstom Technology Ltd Regenerative air preheater design to reduce cold end fouling

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181602A (en) * 1961-06-05 1965-05-04 Davidson & Co Ltd Heat exchangers
US3233661A (en) * 1962-11-16 1966-02-08 Svenska Rotor Maskiner Ab Flue gas heated regenerative air preheater with stationary heat retaining mass and rotary air channel valves

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181602A (en) * 1961-06-05 1965-05-04 Davidson & Co Ltd Heat exchangers
US3233661A (en) * 1962-11-16 1966-02-08 Svenska Rotor Maskiner Ab Flue gas heated regenerative air preheater with stationary heat retaining mass and rotary air channel valves

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509583A (en) * 1982-10-21 1985-04-09 Apparatebau Rothemuhle Brandt & Kritzler Gesellschaft Mit Beschrankter Haftung Apparatus for regenerative flue gas heat exchanger
AU566890B2 (en) * 1982-10-21 1987-11-05 Apparatebau Rothemuhle Brandt Re-heating or pre-drying a gas through a flue-gas washer and a regenerative heat-exchanger
US5397548A (en) * 1991-03-28 1995-03-14 Apparatebau Rothemuhle Brandt & Kritzler Gesellschaft mit besehrankter Haftung Regenerative heat exchanger
US5535813A (en) * 1995-05-26 1996-07-16 Abb Air Preheater, Inc. Offset support-pedestal housing panel
US20110303135A1 (en) * 2010-06-14 2011-12-15 Alstom Technology Ltd Regenerative air preheater design to reduce cold end fouling

Also Published As

Publication number Publication date
DE2124584B2 (de) 1974-07-04
IT984585B (it) 1974-11-20
ES403156A1 (es) 1975-05-01
FR2137962B1 (enExample) 1973-07-13
DE2124584A1 (de) 1972-12-07
DE2124584C3 (de) 1975-02-27
FR2137962A1 (enExample) 1972-12-29
GB1389303A (en) 1975-04-03

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