EP0807237B1 - Regenerative heat exchanger and a method for operating a regenerative heat exchanger - Google Patents

Regenerative heat exchanger and a method for operating a regenerative heat exchanger Download PDF

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Publication number
EP0807237B1
EP0807237B1 EP96903291A EP96903291A EP0807237B1 EP 0807237 B1 EP0807237 B1 EP 0807237B1 EP 96903291 A EP96903291 A EP 96903291A EP 96903291 A EP96903291 A EP 96903291A EP 0807237 B1 EP0807237 B1 EP 0807237B1
Authority
EP
European Patent Office
Prior art keywords
rotor
heat exchanger
movable plate
water
guided 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.)
Expired - Lifetime
Application number
EP96903291A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0807237A1 (en
Inventor
Rolf HASSELSTRÖM
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
ABB Air Preheater 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 ABB Air Preheater Inc filed Critical ABB Air Preheater Inc
Publication of EP0807237A1 publication Critical patent/EP0807237A1/en
Application granted granted Critical
Publication of EP0807237B1 publication Critical patent/EP0807237B1/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

Definitions

  • the present invention in a first aspect relates to a regenerative heat exchanger of the kind specified in the preamble of claim 1 and in a second aspect to a method for operating a regenerative heat exchanger as specified in the preamble of claim 8.
  • Such a heat exchanger is known e.g. through SE 176 375, disclosing 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.
  • WO94/01730 an improvement is disclosed by using sliding shoes of carbon or graphite instead of ceramic sliding shoes.
  • a sliding shoe eliminates the drawbacks with a sliding shoe of ceramics.
  • graphite has excellent lubrication properties and like carbon has an ability to maintain the flanges of the rotating body clean when adhering a lubricating layer of 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 object of the present invention is to attain a regenerative heat exchanger of the kind in question having contact-free support means without the drawbacks entailing earlier known constructions.
  • the invention is particularly but not exclusively suitable for such heat exchangers where the plates are sector shaped plates located closed to the end surfaces of the rotor so that the support means are axially directed.
  • the water supply means includes a plurality of channels through said distance element.
  • the heat exchanger illustrated in fig. 1 is of conventional type having a stationary casing 1 and 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 as tight as possible and thereby separate the heat exchanging media flowing to and from the rotor through axial openings connected to media ducts (not shown).
  • the radially outer ends of the movable sector plates 6, 8 are provided with two devices 10 each, which devices form support means for maintaining a certain clearance 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 guiding surface 61 for co-operation with a guided surface connected to each of the devices 10.
  • Fig. 2 illustrates a part of the casing and the upper edge flange 12 of the rotor and the upper movable sector plate 6.
  • one of the devices 10 is fixed by screws.
  • the device includes an outer sleeve 15 with a mounting flange 16, which with an intermediate sealing ring 17 is attached to the sector plate 6 by means of screws 18.
  • the outer sleeve 15 has an internal thread 19 and within the outer sleeve 15 there is an inner sleeve 20 having an upper part with an external thread, partly screwed into the thread 19.
  • the inner sleeve is provided with a packing 22, which sealingly contacts the inside of the outer sleeve 15.
  • the upper end of the inner sleeve 20 is provided with a nut 23 welded thereto and its lower end is provided with a bottom plate 24 welded thereto.
  • a circular sliding shoe 25 of graphite or carbon is exchangeable attached by means of a recessed screw 26 screwed into the bottom plate 24.
  • the sliding shoe 25 has a front surface 62 facing and being parallel to the circumferentially continuous guiding surface 61 of the flange 12.
  • the upper end of the outer sleeve 15 is provided with an external annular flange 27 to which the upper end of a sealing bellow 28 of metal is screwed by means of a mounting ring 29, an annular packing 30 and screws 31.
  • the lower end of the bellow 28 is provided with a mounting ring 32, which by means of screws 33 and an intermediate packing 34 is attached in a circular hole in the casing 1 so that a predetermined axial force will be applied downwards on the plate 6 due to the spring effect of the bellow 28.
  • a measuring device 13 is provided for measuring the clearance between the plate 6 and the flange 12. It includes a tube 40, attached with its lower end in a hole 41 in the sector plate 6 and with its upper end in a hole 42 in the flange 27, and thus extends within the bellow 28. Inside the tube there is a measuring rod 43, the upper end of which is fixed in the shown position to a sleeve 44 by means of a not shown spring and an external flange on the rod, which sleeve 44 is screwed on to the tube 40. In that position a scaled part 45 of the upper end of the rod 43 projects out through the sleeve 44, and the bottom end of the rod 43 is aligned with the underside of the sector plate 6.
  • a measuring clock 50 having a measure probe 51 contacting the top end of the scaled part 45 can be provided.
  • Support of the movable sector plate 6 for maintaining a clearance between the plate 6 and the flange 12 is attained through contact-free co-operation between a guiding surface 61 being the outer end surface of the rotating flange 12 and a stationary guided surface 62, being the front surface of the sliding shoe 25.
  • means are provided for establishing a cushion of water steam between these surfaces 61, 62.
  • These means includes a source 64 of water under pressure, connected through a pipe 63 to the interior 65 of the sleeve 20 in which the sliding shoe 25 is mounted. Through the sliding shoe 25 channels 66 communicate the interior 65 of the sleeve 20 with the end surface 62 of the sliding shoe 25.
  • Water thereby is supplied from the water source 64 to the guiding surface 61 of the flange 12.
  • the temperature of the flange is about 350° C, which will result in complete or partial vaporization of the water that comes into contact therewith.
  • the pressure of the water is sufficient to force the water to continuously flow from the channels 66 and escape between the guided surface 62 and the guiding surface 61, which thereby are pressed away from each other. In that way a cushion of the vaporized water is formed between these surfaces 61, 62, having an axial thickness of a fraction of a mm. Since there will be no contact between the surfaces 61, 62 no wear of the sliding shoe will occur. Sufficient water pressure in some applications will be attained by the ordinary line pressure, but in other applications a pump for raising the pressure might be necessary.
  • Fig. 3 illustrates an alternative embodiment of the invention according to which there is also or alternatively provided sealing plates 70 closed to the cylindrical surface of the rotor 2.
  • These plates 70 are vaulted to correspond to the cylindrical surface and are substantially rectangular.
  • the plates are radially movable by means not shown and co-operate with axially directed edge flanges 71 at the upper and lower ends of the rotor 2.
  • each movable plate 70 and the flanges 71 a certain clearance should be maintained which is accomplished by devices 10' of the same kind as the supports 10 used to maintain the clearance between the sector plates 6, 8 and the ends of the rotor 2.
  • devices 10' of the same kind as the supports 10 used to maintain the clearance between the sector plates 6, 8 and the ends of the rotor 2.
  • Figs. 4 and 5 illustrate two preferred alternatives in which these channel 66 are arranged to promote the creation of the steam cushion.
  • the channels 66 at the bottom side ends in a cavity 67 facing the guiding surface 61 of the flange 12, and the walls 68 of the cavity 68 are preferably tapered.
  • the channels 66 are inclined relative to the axial direction and meet centrally at the guided surface 62 of the sliding shoe 25.

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)
EP96903291A 1995-02-10 1996-02-09 Regenerative heat exchanger and a method for operating a regenerative heat exchanger Expired - Lifetime EP0807237B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9500476 1995-02-10
SE9500476A SE503962C2 (sv) 1995-02-10 1995-02-10 Regenerativ värmeväxlare och ett sätt att driva en regenerativ värmeväxlare
PCT/SE1996/000156 WO1996024812A1 (en) 1995-02-10 1996-02-09 Regenerative heat exchanger and a method for operating a regenerative heat exchanger

Publications (2)

Publication Number Publication Date
EP0807237A1 EP0807237A1 (en) 1997-11-19
EP0807237B1 true EP0807237B1 (en) 2001-01-10

Family

ID=20397152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96903291A Expired - Lifetime EP0807237B1 (en) 1995-02-10 1996-02-09 Regenerative heat exchanger and a method for operating a regenerative heat exchanger

Country Status (6)

Country Link
EP (1) EP0807237B1 (xx)
DE (1) DE69611519T2 (xx)
DK (1) DK0807237T3 (xx)
PL (1) PL321712A1 (xx)
SE (1) SE503962C2 (xx)
WO (1) WO1996024812A1 (xx)

Families Citing this family (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
US6749815B2 (en) 2001-05-04 2004-06-15 Megtec Systems, Inc. Switching valve seal
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
US7150446B1 (en) 2002-08-28 2006-12-19 Megtec Systems, Inc. Dual lift system

Family Cites Families (6)

* 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
DK168649B1 (da) * 1992-07-07 1994-05-09 Burmeister & Wains Energi Regenerativ varmeveksler
DE69418610D1 (de) * 1993-07-02 1999-06-24 Berndt Lindstroem Regenerativ-wärmetauscher

Also Published As

Publication number Publication date
PL321712A1 (en) 1997-12-22
WO1996024812A1 (en) 1996-08-15
DE69611519D1 (de) 2001-02-15
EP0807237A1 (en) 1997-11-19
SE503962C2 (sv) 1996-10-07
SE9500476L (sv) 1996-08-11
SE9500476D0 (sv) 1995-02-10
DK0807237T3 (da) 2001-04-30
DE69611519T2 (de) 2001-08-09

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