EP0811143A1 - Echangeur de chaleur rotatif a regeneration et son mode d'utilisation - Google Patents

Echangeur de chaleur rotatif a regeneration et son mode d'utilisation

Info

Publication number
EP0811143A1
EP0811143A1 EP96904422A EP96904422A EP0811143A1 EP 0811143 A1 EP0811143 A1 EP 0811143A1 EP 96904422 A EP96904422 A EP 96904422A EP 96904422 A EP96904422 A EP 96904422A EP 0811143 A1 EP0811143 A1 EP 0811143A1
Authority
EP
European Patent Office
Prior art keywords
gas
front surface
rotor
heat exchanger
end surface
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.)
Granted
Application number
EP96904422A
Other languages
German (de)
English (en)
Other versions
EP0811143B1 (fr
Inventor
Dag Westerlund
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
Ljungstrom Technology AB
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 Ljungstrom Technology AB filed Critical Ljungstrom Technology AB
Publication of EP0811143A1 publication Critical patent/EP0811143A1/fr
Application granted granted Critical
Publication of EP0811143B1 publication Critical patent/EP0811143B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • the present invention in a first aspect relates to a rotary regenerative heat exchanger of the kind specified in the preamble of claim 1 and in a second aspect to a method for operating such heat exchanger as specified in the preamble of claim 8.
  • SE 176 375 discloses a rotary regenerative heat exchanger with a support in the form of rolling bodies, mounted in the outer ends of sector-shaped plates closed to both ends of the rotating part and rolling on a flange along the periphery at the top and bottom end of the rotor.
  • graphite has excellent lubrication properties and like carbon ha an ability to maintain the flanges of the rotating body clean when adhering a lubricating layer carbon or graphite on the flanges.
  • the abrasion of the sliding shoe also secures a correct contact with parallel contact surfaces so that the contact takes place on the complete sliding shoe surface.
  • Carbon and graphite also have a good acceptance of the high temperature and the acid environment that are present. By the abrasion of the sliding shoes they will gradually be consumed and have to be replaced. The degree of abrasion, however, will vary widely, so that one or more sliding shoes might be worn down so much that the clearance reaches zero, whereas other sliding shoes will be almost unaffected.
  • Each sliding shoe therefore is adjustable in a direction perpendicular to the contact surface.
  • a similar solution is disclosed in WO95/00809, in which there is provided a measuring rod adjacent to the sliding shoe, which measuring rod is directed parallel to the adjustment direction. The measuring rod from a resting position can be momentary brought in contact with the related flange and indicates when the size of the clearance requires advancement of the sliding shoe a distance so that the initial clearance is restored.
  • the object of the present invention therefore is to attain a regenerative heat exchanger of the kind in question in which the number of sliding shoes is as small as possible.
  • the device according to the invention thus deviates from the traditional concept of using two or more supports for the sector plate, when supports of the non-contacting type are used.
  • the problem of avoiding tilting is overcome in that the support is elongated so that the outer part of the sector plate is stabilized in the circumferential direction.
  • the number of devices for establishing gas cushions is reduced to the half, which lowers the manufacturing and maintenance costs and reduces the risk for failure.
  • the air cushion Due to the elongated shape, the air cushion will have a larger circumferential extension, and the area of the air cushion can be increased. Thereby a sufficient raising force from the air cushion can be attained at a lower pressure of the supplied gas in comparison with a conventional pair of circular air cushions. Since the requirement on the pressure level of the gas source thus will be lower, the running costs for the gas supply is reduced.
  • the angular extension of the front surface preferably is more than half the angular extension the sector plate in order to attain a sufficiently stabilized support by the air cushion and it should preferably be symmetrically located.
  • the gas outlet has a corresponding elongated shape, whereby a uniform distributio of the gas is promoted.
  • fig. 1 is a partial axial section through a first preferred embodiment of the invention
  • fig. 2 is a view taken along line II-II of fig. 1
  • fig. 3 is a view similar to that of fig. 2
  • fig. 4 is a view similar to that of fig. 2
  • fig. 5 is a schematic section along line V-V of fig. 2
  • fig. 6 is a view similar to that of fig. 5, illustrating a fourth embodiment of the invention.
  • the heat exchanger illustrated in fig. 1 is of conventional type having a stationary casing 1 an a cylindrical rotor 2 containing the regenerative mass 3.
  • the rotor has a hub 4 and an upper fixed sector shaped centre plate 5 with a movable sector plate 6 pivotally connected thereto and corresponding lower fixed centre plate 7 and movable sector plate 8.
  • the two sets of plates 5, 6 and 7, 8 have the function to seal against the upper and lower ends of the rotor 2 a tight as possible and thereby separate the heat exchanging media flowing to and from the roto through axial openings connected to media ducts (not shown).
  • each of the movable sector plates 6, 8 are provided a device, which device forms support means 10 for maintaining a certain clearances between the ends of the sector plates 6, 8 and an upper and lower annular edge flange 12 attached to the rotor along its upper and lower peripheries, each flange having an outer circumferentially continuous end surface 61 for co-operation with a front surface 62 connected to each of the devices 10.
  • the sector plate 6 is seen from the outside and co-operates with the end surface 11 of the rotor end flange 9.
  • pressure gas is supplied to a sliding shoe forming gas cushion means with a front surface facing the end surface 11 of the flange 9.
  • the front surface 12 of the sliding shoe is arc-shaped and limited by two concentric circular arcs 14 and 15.
  • the sliding shoe is symmetrically arranged in relation to a symmetry line 19 of the sector plate 6 and extends along the flange 9 about two thirds of the angular extension of the sector plate.
  • the gas supplied through the sleeve 15 is distributed through channels in the sliding shoe to an arc-shaped groove 16 in the front surface 12 of the sliding shoe, and creates an air cushion between the front surface 12 of the sliding shoe and the end surface 11 of the flange 9. Although only one gas cushion supports the sector plate 6 the support will be stable and without risk for tilting due to the elongated shape of the gas cushion.
  • Fig. 3 illustrates the support 10 through a section therethrough.
  • the arc-shaped sliding shoe 17 is rigidly attached to the sector plate 6 and projects a short distance from the internal surface 28 of the sector plate 6.
  • the groove 16 forming the gas outlet means extends along almost the entire length of the front surface. Through a plurality of channels 27 the groove 16 communicates with the opposite side of the sliding shoe. This side is covered by a closure member 18 of the same shape as the sliding shoe 17.
  • the closure member has a gas inlet opening 25 and a distribution groove 26 through which the inlet opening 25 and the channels 27 communicate.
  • a circular sleeve 15 is attached to the closure member 18 around the gas inlet opening 25, which sleeve extends out through a circular hole in the casing 1, and the opposite end of the sleeve 15 is through a gas conduit 23 connected to a pressure gas source 22. Between a flange 20 attached to the sleeve 15 and the casing 1 a sealing bellow 21 is provided, so that a predetermined axial force will be applied downwards on the plate 6 du to the spring effect of the bellow 21.
  • pressure gas flows through conduit 23, the interior 24 of the sleeve 15, the inlet opening 25, the distribution groove 26 and the channels 27 to the groove 16.
  • the pressure o the gas keeps the front surface 12 of the sliding shoe 17 raised from the end surface 11 of th flange 9 against the action of the force from the bellow 21, so that the gas is allowed to esca through these surfaces, thereby creating the elongated air cushion.
  • Fig. 6 illustrates an alternative embodiment of the support 10, in which the front surface 12" co-operating with the end surface 11 of the flange 9 is formed by a part of the inner surface 2 of the sector plate 6.
  • the clearance S between the sector plate 6 and the end flange thereby will be more narrow.
  • the groove 12' extends circumferentially almost to the ends of the sector plate so that the air cushion wil receive a corresponding extension.
  • Figs. 3 and 4 illustrate alternative shapes of the front surface 12', 12", respectively.
  • the front surface 12' is rectangular, limited by two straight lines 13', 14', and in fig. 4 the fro surface is crescent-shaped, limited by two non-concentric circular arcs 13", 14".

Landscapes

  • 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)
  • Treatment Of Fiber Materials (AREA)

Abstract

Dans un échangeur de chaleur rotatif à régénération, du type à rotor monté dans un carter, des supports sont prévus pour maintenir un certain espacement (S) entre le rotor et des plaques mobiles, en forme de secteur de cercle, (6) fixées au carter et situées à proximité des extrémités du rotor. Chaque support coopère grâce à une face antérieure (12) prévue sur des coussins de gaz (17), avec une surface d'extrémité (11) reposant sur une bride (9) du rotor. Chaque support est muni d'un tuyau de gaz débouchant dans l'évent (16) de la face antérieure (12) et relié à une source de gaz (22) dont la pression est suffisante pour que se forme un interstice entre la surface antérieure (12) et la surface postérieure (11), de façon à créer un coussin de gaz entre les faces lorsque le gaz sort par l'évent en traversant l'interstice. Le dispositif décrit comporte une plaque en forme de secteur de cercle (6) munie d'un unique support de coussin d'air avec une surface antérieure (12) présentant une forme allongée, dont la dimension la plus longue est orientée parallèlement à la circonférence de la face arrière (11).
EP96904422A 1995-02-24 1996-02-21 Echangeur de chaleur rotatif a regeneration et son mode d'utilisation Expired - Lifetime EP0811143B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9500681A SE504019C2 (sv) 1995-02-24 1995-02-24 Roterande regenerativ värmeväxlare och sätt att styra en sådan värmeväxlare
SE9500681 1995-06-07
PCT/SE1996/000232 WO1996026407A1 (fr) 1995-02-24 1996-02-21 Echangeur de chaleur rotatif a regeneration et son mode d'utilisation

Publications (2)

Publication Number Publication Date
EP0811143A1 true EP0811143A1 (fr) 1997-12-10
EP0811143B1 EP0811143B1 (fr) 1999-11-24

Family

ID=20397345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96904422A Expired - Lifetime EP0811143B1 (fr) 1995-02-24 1996-02-21 Echangeur de chaleur rotatif a regeneration et son mode d'utilisation

Country Status (8)

Country Link
EP (1) EP0811143B1 (fr)
CZ (1) CZ288346B6 (fr)
DE (1) DE69605287T2 (fr)
DK (1) DK0811143T3 (fr)
HU (1) HU220316B (fr)
PL (1) PL321714A1 (fr)
SE (1) SE504019C2 (fr)
WO (1) WO1996026407A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6261092B1 (en) 2000-05-17 2001-07-17 Megtec Systems, Inc. Switching valve
US6669472B1 (en) 2002-08-28 2003-12-30 Megtec Systems, Inc. Dual lift system
US7150446B1 (en) 2002-08-28 2006-12-19 Megtec Systems, Inc. Dual lift system
US7325562B2 (en) 2002-05-07 2008-02-05 Meggec Systems, Inc. Heated seal air for valve and regenerative thermal oxidizer containing same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6749815B2 (en) 2001-05-04 2004-06-15 Megtec Systems, Inc. Switching valve seal

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973548C (de) * 1952-09-16 1960-03-24 Babcock & Wilcox Dampfkessel W Umlaufender Regenerativ-Vorwaermer fuer Gas, Luft od. dgl.
US3122200A (en) * 1960-05-24 1964-02-25 Koch Jakob Dynamic sealing means for rotary regenerative heat exchangers
US3232335A (en) * 1962-03-21 1966-02-01 Svenska Rotor Maskiner Ab Rotary regenerative preheater
US3499480A (en) * 1968-09-10 1970-03-10 Air Preheater Flame seals
GB9206136D0 (en) * 1992-03-20 1992-05-06 Wes Technology Inc Modifications to air heaters
DK168649B1 (da) * 1992-07-07 1994-05-09 Burmeister & Wains Energi Regenerativ varmeveksler
HU9503580D0 (en) * 1993-07-02 1996-02-28 Lindstroem Regenerative heat exchanger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9626407A1 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6261092B1 (en) 2000-05-17 2001-07-17 Megtec Systems, Inc. Switching valve
US7325562B2 (en) 2002-05-07 2008-02-05 Meggec Systems, Inc. Heated seal air for valve and regenerative thermal oxidizer containing same
US6669472B1 (en) 2002-08-28 2003-12-30 Megtec Systems, Inc. Dual lift system
US6783111B2 (en) 2002-08-28 2004-08-31 Megtec Systems Inc. Dual lift system
US7150446B1 (en) 2002-08-28 2006-12-19 Megtec Systems, Inc. Dual lift system

Also Published As

Publication number Publication date
DE69605287D1 (de) 1999-12-30
HUP9801281A2 (hu) 1998-08-28
CZ266497A3 (en) 1997-11-12
DE69605287T2 (de) 2000-07-20
CZ288346B6 (en) 2001-05-16
HU220316B (hu) 2001-12-28
EP0811143B1 (fr) 1999-11-24
DK0811143T3 (da) 2000-05-15
SE9500681L (sv) 1996-08-25
SE9500681D0 (sv) 1995-02-24
PL321714A1 (en) 1997-12-22
HUP9801281A3 (en) 1999-11-29
SE504019C2 (sv) 1996-10-21
WO1996026407A1 (fr) 1996-08-29

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