US3786868A - Self-compensating sector plate - Google Patents

Self-compensating sector plate Download PDF

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Publication number
US3786868A
US3786868A US00246957A US3786868DA US3786868A US 3786868 A US3786868 A US 3786868A US 00246957 A US00246957 A US 00246957A US 3786868D A US3786868D A US 3786868DA US 3786868 A US3786868 A US 3786868A
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US
United States
Prior art keywords
rotor
sector plate
rotary regenerative
regenerative heat
fulcrum
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
US00246957A
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English (en)
Inventor
H Finnemore
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.)
Alstom Power Inc
Original Assignee
Air Preheater Co 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 Air Preheater Co Inc filed Critical Air Preheater Co Inc
Application granted granted Critical
Publication of US3786868A publication Critical patent/US3786868A/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
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/047—Sealing means
    • 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
    • Y10S165/013—Movable heat storage mass with enclosure
    • Y10S165/016—Rotary storage mass

Definitions

  • the rotor is surrounded by a housing including a sector plate at opposite ends of the rotor that separates the several fluids.
  • a pivoted mounting means maintains the sector plate at an optimum distance from the rotor whereby fluid leakage from the rotor will be reduced to a minimum throughout a wide range of temperature variation and thermal expansion.
  • the heat absorbent element is carried in a rotatable rotor that is surrounded by a fixed cylindrical housing including selector plates at the ends thereof that separate the hot gas from the cooler air.
  • the end edges of the rotor are usually provided with flexible sealing members that extend to the adjacent surface of the surrounding rotor housing to resiliently accommodate a limited degree of thermal expansion and contraction that accompanies normal thermal variations within the rotor.
  • the temperature of the heat exchanger may rise rapidly so that the limit of allowable thermal expansion is exceeded.
  • the relatively movable parts of the rotor and the rotor housing also expand rapidly and are moved into direct interference one with the other so as tocause excessive abrasion and binding of the parts. Such wear may necessitate shutdown of the apparatus and repair of the sealing members before normal operation is resumed.
  • FIG. 1 is a cross-section of a rotary regenerative heat exchanger embodying an invention
  • FIG. 2 is an enlarged cross-sectional view showing the details of the self-compensating sector plate
  • FIG. 3 is a diagrammatic representation of a rotary regenerative air preheater having rotor turn-down.
  • the heat absorbent material carried by the rotor When rotated, the heat absorbent material carried by the rotor is alternately positioned in a hot gas stream and a cool air stream in order that heat from the hot gas is transferred to the cool air through the intermediary of the heat absorbent material.
  • the hot gas enters the heat exchanger through an inlet duct 22 and is discharged, after traversing the heat exchanger material, through an outlet duct 24.
  • the air in turn enters the heat exchanger through an inlet duct 26 and is discharged through an outlet duct 28 to which an induced draft fan is usually connected. After passing over the hot heat absorbent material 16 and absorbing heat therefrom, the stream of heated air is conveyed to its place of ultimate use.
  • a cylindrical housing 32 encloses the rotor in spaced relation thereto to provide an annular space 34 therebetween, while sector plates 36 at opposite ends of the rotor are provided with spaced apertures that admit and discharge the streams of hot gas and cooler air.
  • sector plates 36 at opposite ends of the rotor are provided with spaced apertures that admit and discharge the streams of hot gas and cooler air.
  • the inlet for the hot or heating fluid is illustrated as being at the upper end of the rotor while the inlet for the cooler fluid to be heated is at the lower end of the rotor.
  • the lower end of the rotor adjacent the inlet for the cool fluid is termed the cold end while that adjacent the hot gas inlet is termed the hot end of the rotor.
  • the maximum thermal expansion of the rotor occurs at the top or hot" end of the rotor, and in response to this thermal gradient, the rotor assumes a shape similar tothat of an inverted dish shown by FIG. 3 and commonly known as rotor turn-down.
  • the result of a phenomenon of this nature is to decrease the vertical clearance between the rotor and the surrounding rotor housing at the cold" end of the heater and to increase the vertical seal clearance at the hot" end of the heater sufficient to substantially increase fluid leakage between the relatively movable parts.
  • my invention provides a pivotal support for the hot-end sector plate that is adapted to follow the radial inboard ends of the sector plate axially in the same direction as the thermal expansion of the rotor post, while the outboard end thereof is adapted to move oppositely to compensate for the turn-down at the rotor shell.
  • I provide a primary support 42 or tracking arrangement for the inboard end of the hot end sector plate.
  • the support 42 depends from the housing for the guide bearing 18 or similar structure that moves axially in response to axial expansion and contraction of the rotor whereby the inboard end of the sector plate 36 will rise or fall in response to thermal expansion of the rotor.
  • a pivotal fulcrum is mounted for axial movement on the fixed rotor housing and is adapted to pivotally support the hot end sector plate at a pivot point 46 intermediate the inboard and outboard ends of the sector peate 36.
  • the rotor housing is maintained at a nearly constant temperature, it is not subjected to excessive thermal expansion and the fulcrum remains substantially fixed with respect to the adjacent sector plate 36 while the inboard end thereof moves up or down in accordance with the expansion of the rotor.
  • the sector plate is analagous to a lever whereby the outboard end thereof comprises its unsupported end.
  • an axial force applied at the inner end 42 of the sector plate about pivot 56 produces movement at the outboard end thereof opposite to that at the inboard end and in an amount dependent upon the ratio of the lever arms 47. and 49.
  • the pivot 46 is provided with a radially adjustable mounting 45 that permits radial movement of the pivot 46 to effect a change in length of the lever arms 47 and 49.
  • Turning adjustment means 44 that bears against plate 50 moves thepivot 46 for plate 36 axially to achieve a predetermined clearance with respect to the adjacent rotor. Therefore, the outer end of the sector plate may be made to move axially the distance required to conform to the turndown at the outer periphery of the rotor so that an optimum sealing relationship continuously exists.
  • the sector plate 40 at the cold end of the heat exchanger is subjected to relatively little thermal variation and it may be pr-e-set on stationary brackets 52 in accordance with present standards so that it remains fixed throughout its period of operation.
  • rotor turn-down at the cold end actually decreases the clearance space between the rotor and the sector plate, there will be closer tolerances and an improved sealing relationship.
  • a rotary regenerative heat exchanger having a rotor including a central rotor post and concentric rotor shell spaced therefrom to provide an annular space therebetween, a mass of heat absorbent material carried in the annular space between the rotor post and the rotor shell, a housing surrounding the rotor is spaced relation including inlet and outlet ducts at opposite ends thereof for a heating fluid and a fluid to be heated, bearing means supporting one end of the rotor adapted to remain at a fixed distance therefrom, a guide bearing at the opposite end of the rotor adapted to move axially according to the thermal expansion of the rotor, means for rotating the rotor about its axis, a pivotal sector plate intermediate an end of the rotor housing and adjacent end of the rotor including imperforate portions between spaced apertures that separate the heating fluid from the fluid to be heated, means movable in accordance with the axial expansion of the rotor adapted to support the sector plate at a point adjacent the inboard end of the
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the means supporting the inboard end of the sector plate comprises the housing for the guide bearing that moves axially according to the thermal expansion of the rotor post.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the pivotal sector plate is located at the end of the rotor adjacent the inlet for the heating fluid.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the fulcrum pivotally supporting the sector plate lies more nearly adjacent to the rotor post than to the outboard end of the sector plate.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 including radially movable means supporting the fulcrum whereby radial movement thereof willvary the ratio of distance between the fulcrum and the inboard and outboard ends of the sector plate and thus vary the axial movement of the outboard end of the sector plate.
  • Rotary regenerative heat exchange apparatus as defined in claim 5 including an axially movable means supporting the pivotal fulcrum.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US00246957A 1972-04-24 1972-04-24 Self-compensating sector plate Expired - Lifetime US3786868A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24695772A 1972-04-24 1972-04-24

Publications (1)

Publication Number Publication Date
US3786868A true US3786868A (en) 1974-01-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00246957A Expired - Lifetime US3786868A (en) 1972-04-24 1972-04-24 Self-compensating sector plate

Country Status (3)

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US (1) US3786868A (enrdf_load_stackoverflow)
DE (1) DE2320374C3 (enrdf_load_stackoverflow)
FR (1) FR2181945B1 (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024907A (en) * 1976-01-08 1977-05-24 The Air Preheater Company, Inc. Sealing plate support
US4040475A (en) * 1976-07-12 1977-08-09 The Air Preheater Company, Inc. Axially movable sector plate support for rotary regenerative heat exchanger
DE2731110A1 (de) * 1976-07-12 1978-01-19 Svenska Rotor Maskiner Ab Dichtungsanordnung an einem drehspeicherwaermetauscher
US4122891A (en) * 1977-09-06 1978-10-31 The Air Preheater Company, Inc. Sector plate support
US4124063A (en) * 1977-08-19 1978-11-07 The Air Preheater Company, Inc. Sector plate
US4219069A (en) * 1979-05-31 1980-08-26 The Air Preheater Company, Inc. Quick release for sector plate
US5029632A (en) * 1990-10-22 1991-07-09 The Babcock & Wilcox Company Air heater with automatic sealing
US5038849A (en) * 1989-10-24 1991-08-13 Damper Design, Inc. Sealing of air heaters by deforming sector plates
US5063993A (en) * 1990-10-22 1991-11-12 The Babcock & Wilcox Company Air heater with automatic sealing
US5727617A (en) * 1996-12-27 1998-03-17 Abb Air Preheater, Inc. Plate stabilizer assembly for rotary regenerative air preheaters
US12007174B2 (en) 2020-05-13 2024-06-11 Howden Group Limited Parabolically deforming sector plate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873952A (en) * 1952-09-06 1959-02-17 Svenska Rotor Maskiner Ab Rotary regenerative heat exchangers for gaseous media
US3010703A (en) * 1959-02-09 1961-11-28 Air Preheater Sealing arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873952A (en) * 1952-09-06 1959-02-17 Svenska Rotor Maskiner Ab Rotary regenerative heat exchangers for gaseous media
US3010703A (en) * 1959-02-09 1961-11-28 Air Preheater Sealing arrangement

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024907A (en) * 1976-01-08 1977-05-24 The Air Preheater Company, Inc. Sealing plate support
US4040475A (en) * 1976-07-12 1977-08-09 The Air Preheater Company, Inc. Axially movable sector plate support for rotary regenerative heat exchanger
DE2730830A1 (de) * 1976-07-12 1978-01-19 Svenska Rotor Maskiner Ab Dichtungsanordnung an einem drehspeicherwaermetauscher
DE2731110A1 (de) * 1976-07-12 1978-01-19 Svenska Rotor Maskiner Ab Dichtungsanordnung an einem drehspeicherwaermetauscher
JPS5435444A (en) * 1977-08-19 1979-03-15 Air Preheater Rotary regenerative heat exchanger
US4124063A (en) * 1977-08-19 1978-11-07 The Air Preheater Company, Inc. Sector plate
DE2838609A1 (de) * 1977-09-06 1979-03-08 Svenska Rotor Maskiner Ab Drehspeicherwaermetauscher
US4122891A (en) * 1977-09-06 1978-10-31 The Air Preheater Company, Inc. Sector plate support
US4219069A (en) * 1979-05-31 1980-08-26 The Air Preheater Company, Inc. Quick release for sector plate
DE3020672A1 (de) * 1979-05-31 1980-12-11 Svenska Rotor Maskiner Ab Drehspeicherwaermetauscher
US5038849A (en) * 1989-10-24 1991-08-13 Damper Design, Inc. Sealing of air heaters by deforming sector plates
US5029632A (en) * 1990-10-22 1991-07-09 The Babcock & Wilcox Company Air heater with automatic sealing
US5063993A (en) * 1990-10-22 1991-11-12 The Babcock & Wilcox Company Air heater with automatic sealing
US5727617A (en) * 1996-12-27 1998-03-17 Abb Air Preheater, Inc. Plate stabilizer assembly for rotary regenerative air preheaters
US12007174B2 (en) 2020-05-13 2024-06-11 Howden Group Limited Parabolically deforming sector plate

Also Published As

Publication number Publication date
DE2320374B2 (de) 1980-05-08
DE2320374A1 (de) 1973-11-15
FR2181945A1 (enrdf_load_stackoverflow) 1973-12-07
FR2181945B1 (enrdf_load_stackoverflow) 1977-04-29
DE2320374C3 (de) 1981-02-05

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