EP0601167A1 - Regenerative heat exchanger. - Google Patents

Regenerative heat exchanger.

Info

Publication number
EP0601167A1
EP0601167A1 EP93914650A EP93914650A EP0601167A1 EP 0601167 A1 EP0601167 A1 EP 0601167A1 EP 93914650 A EP93914650 A EP 93914650A EP 93914650 A EP93914650 A EP 93914650A EP 0601167 A1 EP0601167 A1 EP 0601167A1
Authority
EP
European Patent Office
Prior art keywords
rotor
slide shoe
heat exchanger
radial sealing
sealing device
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
EP93914650A
Other languages
German (de)
French (fr)
Other versions
EP0601167B1 (en
Inventor
Bjarne Nygaard Madsen
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.)
Burmeister and Wain Energy AS
Original Assignee
Burmeister and Wain Energy AS
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 Burmeister and Wain Energy AS filed Critical Burmeister and Wain Energy AS
Publication of EP0601167A1 publication Critical patent/EP0601167A1/en
Application granted granted Critical
Publication of EP0601167B1 publication Critical patent/EP0601167B1/en
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 invention relates to a renegerative heat ex ⁇ changer comprising a heat exchanger matrix in form of a ro- tor having at each end a smooth, axial face at the peri ⁇ phery, and at each end a radial sealing device which by means of a counterweight over a link connection is kept against the rotor, as well as a spacing device for cr trol ⁇ ling the axial distance between the radial sealing dt.ice and the rotor.
  • the object of the invention is to provide a regenera ⁇ tive heat exchanger, in which the size of the gap is controlled in a simple way without the occurence of the drawbacks described above.
  • the spacing means comprising a slide shoe of carbon which pro ⁇ trudes from the radial sealing and bears against the smooth axial face of the rotor, and by the protrusion of the slide shoe being adjustable relative to the housing.
  • the desired gap size can be determined. This gap size will be maintained irrespecti ⁇ vely of possible changes in the geometry of the rotor due to temperature changes in the gases flowing through the rotor, as long as the counterweight keeps the slide shoe against the smooth axial face of the rotor.
  • the slide shoe is during operation fixed against turning relative to the rotor.
  • a better adaptation of the slide shoe to the smooth face of the rotor is attained, which results in reduced friction and reduced wear.
  • a second embodiment of the heat exchanger according to the invention is characteristic in that the force, by which a slide shoe is urged against the smooth face of the rotor is less than 50 kg.
  • the force, by which the slide shoe is urged towards the rotor is to be of a size sufficient to ensure a permanent bearing of the slide shoe against the ro- tor irrespective of the variations of the geometry of the rotor caused by temperature variations.
  • a third embodiment of the regenerative heat exchanger according to the invention is characteristic in that the spacing device comprises a housing mounted on the face of the radial sealing device opposite the axial face of the ro ⁇ tor, that the radial sealing device is provided with an opening, through which the slide shoe protrudes, that the slide shoe is mounted at one end of a spindle which is axially movable in the housing and which at its other end has a thread engaging a corresponding thread in the housing, and in that the threaded end of the spindle is adapted to engage an adjustment tool and is provided with a thread for a counternut for locking the position of the spindle.
  • the gap is adjusted manually by screwing the spindle with the slide shoe more or less for ⁇ ward towards the smooth axial face of the rotor, after which the spindle is locked by means of a counternut. It will then normally only be necessary, after a longer operation period, to make a manual readjustment on account of wear of the slide shoe.
  • the need for electric or electromagnetic con ⁇ trolling devices, cables, signal devices, etc. therefore does not exist, the result being lower production and main- tenance costs of the heat exchanger.
  • Fig. 1 shows somewhat schematically a section in a plane parallel with the rotor axis in a regenerative heat exchanger according to the invention
  • Fig. 2 is a plan view of the arrangement shown in Fig. 1, and
  • Fig. 3 is a detailed section of the spacing device shown in Figs. 1 and 2.
  • Fig. 1 shows a heat exchanger matrix 1 in form of a rotor. For the sake of clarity only the areas at the end fa ⁇ ces of the rotor are shown.
  • a radial sealing device 2 is pro- vided which at the centre is supported in a manner not shown in detail and which at each end rests on a supporting arm 3 engaging a slot 4 in the end of the radial, sealing device.
  • the supporting arm 3 is connected to a horizontal shaft 5 mounted on a supporting beam 6 which is a part of the sup- porting construction of the heat exchanger and which in a manner not shown in detail also carries the upper bearing of the rotor.
  • the supporting arm 3 is connected with a rod 7, in which a shroud screw 8 is inserted in such a way that the length of the rod 7 is adjustable.
  • the upper end 7 of the rod is pivotally connected with the one end of a lever arm 9, the other end of which carries a counterweight 10.
  • the lever arm 9 pivots about a shaft 11 supported by bearing brackets 12.
  • a similar arrange ⁇ ment is provided, viz. a radial sealing device 15, the end of which is carrying a supporting arm 16 which is in enga- gement with a slot 17 in the radial sealing device 15 and which is pivotable about a shaft 18.
  • the supporting arm 16 is connected with the lower end of a rod 20, the length of which is adjustable in the same way as described in respect of the rod 7.
  • the rod 20 is at its upper end connected to one end of a lever arm 22, the other end of which carries a counterweight 23.
  • the lever arm 22 pivots about a shaft 11 supported by bearing brackets 12.
  • Each radial sealing device is at its free ends pro ⁇ vided with a spacing device 24 which will be described in detail in the following with reference to Fig. 3.
  • the spacing device 24 comprises a tubular housing 25, which at one end has a flange 26 fastened by means of pin bolts 27 to the side of the radial sealing device 2 opposite the rotor 2.
  • a di ⁇ placeable spindle 28 is arranged, said spindle carrying at one end a thread 29 en ⁇ gaging a corresponding thread in the housing 25.
  • the spindle has at its free ends a spigot 30 with faces for a spanner.
  • the other end of the spindle carries a bottom plate 32, in which a slide shoe 33 of carbon is fixed against ro- tation by means of a retaining screw 34.
  • the slide shoe 33 protruding from the housing through an opening 38 in the ra ⁇ dial sealing device is shown bearing against the smooth axial face 13 of the rotor which is here constituted by one of the flanges of an angle bar 36 connected to the periphery of the rotor.
  • the gap 37 between the radial sealing device 2 and the rotor face 13 may be set at a desired value.
  • the associated counterweight 10 and the rod 7 are adjusted in such a way that it is ensured that the slide shoe during operation always bears against the face 13 irrespective of whether during operation of the heat ex- changer deformations of the geometry of the rotor occur due to variatons of the operation temperature of the rotor.
  • a cylindrical bellows 41 is provided as sealing element between the housing 25 and the supporting beam 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Sealing Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Power Steering Mechanism (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Braking Arrangements (AREA)
  • Air Supply (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The heat exchanger (1) has a rotor (1) with radial sealing devices (2, 15) which by means of counterweight (10, 23) over link connections are kept against the rotor. A spacing device (24) comprises an adjustable spindle carrying a slide shoe (33) made of carbon which slides against a smooth face (13) of the rotor, thereby determining the gap between the radial sealing device and the rotor.

Description

REGENERATIVE HEAT EXCHANGER
The invention relates to a renegerative heat ex¬ changer comprising a heat exchanger matrix in form of a ro- tor having at each end a smooth, axial face at the peri¬ phery, and at each end a radial sealing device which by means of a counterweight over a link connection is kept against the rotor, as well as a spacing device for cr trol¬ ling the axial distance between the radial sealing dt.ice and the rotor.
From DE published specification no. l 035 843 a heat exchanger of the above type is known, in which the spacing device is a roller pivotally suspended in the radial sealing device and running on an annular rail at the end face of the rotor. It is stated that the operation of the rollers is im¬ peded on account of a high content of dust in the gas flow¬ ing through the heat exchanger, and various combinations of sizes and materials for the roller and its axle bolt are suggested to overcome these difficulties. In DE Patent No. l 133 850 a similar arrangement is disclosed, and it is stated that the wear on the roller on account of the big forces and the influence from dust and high temperature is so consider¬ able that the life of the roller becomes short, and it is advised to find another solution which is not based on me- chanical contact between the radial sealing device and the rotor.
The object of the invention is to provide a regenera¬ tive heat exchanger, in which the size of the gap is controlled in a simple way without the occurence of the drawbacks described above.
According to the invention this is achieved by the spacing means comprising a slide shoe of carbon which pro¬ trudes from the radial sealing and bears against the smooth axial face of the rotor, and by the protrusion of the slide shoe being adjustable relative to the housing.
By adjusting the counterweight in such a way that the slide shoe bears against the smooth axial face at the peri¬ phery of the rotor and then adjusting the protrusion of the slide shoe relative to the housing, the desired gap size can be determined. This gap size will be maintained irrespecti¬ vely of possible changes in the geometry of the rotor due to temperature changes in the gases flowing through the rotor, as long as the counterweight keeps the slide shoe against the smooth axial face of the rotor.
Tests have surprisingly shown that it is possible to use a slide shoe made from carbon as a spacing element be¬ tween the radial sealing device and the rotor without the occurence of heavy wear of the slide shoe. This is due to the fact that the carbon is substantially not influenced by the prevailing high temperatures and corrosive gases. At the same time the carbon is self-lubricating, a low friction between the radial sealing device and the rotor being thus achieved. It has been found that part of the carbon of the slide shoe, after some time of operation, is embedded in the smooth axial face of the rotor, the friction thus stabiliz¬ ing after some time on a low value.
In a preferred embodiment the slide shoe is during operation fixed against turning relative to the rotor. Here¬ by, a better adaptation of the slide shoe to the smooth face of the rotor is attained, which results in reduced friction and reduced wear.
A second embodiment of the heat exchanger according to the invention is characteristic in that the force, by which a slide shoe is urged against the smooth face of the rotor is less than 50 kg. The force, by which the slide shoe is urged towards the rotor, is to be of a size sufficient to ensure a permanent bearing of the slide shoe against the ro- tor irrespective of the variations of the geometry of the rotor caused by temperature variations.
A third embodiment of the regenerative heat exchanger according to the invention is characteristic in that the spacing device comprises a housing mounted on the face of the radial sealing device opposite the axial face of the ro¬ tor, that the radial sealing device is provided with an opening, through which the slide shoe protrudes, that the slide shoe is mounted at one end of a spindle which is axially movable in the housing and which at its other end has a thread engaging a corresponding thread in the housing, and in that the threaded end of the spindle is adapted to engage an adjustment tool and is provided with a thread for a counternut for locking the position of the spindle.
In this embodiment the gap is adjusted manually by screwing the spindle with the slide shoe more or less for¬ ward towards the smooth axial face of the rotor, after which the spindle is locked by means of a counternut. It will then normally only be necessary, after a longer operation period, to make a manual readjustment on account of wear of the slide shoe. The need for electric or electromagnetic con¬ trolling devices, cables, signal devices, etc. therefore does not exist, the result being lower production and main- tenance costs of the heat exchanger.
The invention will now be explained in detail by means of an embodiment and with reference to the drawing, in which
Fig. 1 shows somewhat schematically a section in a plane parallel with the rotor axis in a regenerative heat exchanger according to the invention,
Fig. 2 is a plan view of the arrangement shown in Fig. 1, and
Fig. 3 is a detailed section of the spacing device shown in Figs. 1 and 2.
Fig. 1 shows a heat exchanger matrix 1 in form of a rotor. For the sake of clarity only the areas at the end fa¬ ces of the rotor are shown. Opposite the upper (in the draw¬ ing) end face of the rotor a radial sealing device 2 is pro- vided which at the centre is supported in a manner not shown in detail and which at each end rests on a supporting arm 3 engaging a slot 4 in the end of the radial, sealing device. The supporting arm 3 is connected to a horizontal shaft 5 mounted on a supporting beam 6 which is a part of the sup- porting construction of the heat exchanger and which in a manner not shown in detail also carries the upper bearing of the rotor.
The supporting arm 3 is connected with a rod 7, in which a shroud screw 8 is inserted in such a way that the length of the rod 7 is adjustable. The upper end 7 of the rod is pivotally connected with the one end of a lever arm 9, the other end of which carries a counterweight 10. The lever arm 9 pivots about a shaft 11 supported by bearing brackets 12.
At the lower end face of the rotor a similar arrange¬ ment is provided, viz. a radial sealing device 15, the end of which is carrying a supporting arm 16 which is in enga- gement with a slot 17 in the radial sealing device 15 and which is pivotable about a shaft 18. The supporting arm 16 is connected with the lower end of a rod 20, the length of which is adjustable in the same way as described in respect of the rod 7. The rod 20 is at its upper end connected to one end of a lever arm 22, the other end of which carries a counterweight 23. The lever arm 22 pivots about a shaft 11 supported by bearing brackets 12.
Each radial sealing device is at its free ends pro¬ vided with a spacing device 24 which will be described in detail in the following with reference to Fig. 3.
The spacing device 24 comprises a tubular housing 25, which at one end has a flange 26 fastened by means of pin bolts 27 to the side of the radial sealing device 2 opposite the rotor 2. In the housing 25 a diεplaceable spindle 28 is arranged, said spindle carrying at one end a thread 29 en¬ gaging a corresponding thread in the housing 25. The spindle has at its free ends a spigot 30 with faces for a spanner. The other end of the spindle carries a bottom plate 32, in which a slide shoe 33 of carbon is fixed against ro- tation by means of a retaining screw 34. The slide shoe 33 protruding from the housing through an opening 38 in the ra¬ dial sealing device is shown bearing against the smooth axial face 13 of the rotor which is here constituted by one of the flanges of an angle bar 36 connected to the periphery of the rotor.
By screwing the spindle 28 towards the rotor 1 by means of a spanner engaging the spigot 30 the gap 37 between the radial sealing device 2 and the rotor face 13 may be set at a desired value. The associated counterweight 10 and the rod 7 are adjusted in such a way that it is ensured that the slide shoe during operation always bears against the face 13 irrespective of whether during operation of the heat ex- changer deformations of the geometry of the rotor occur due to variatons of the operation temperature of the rotor.
It will be seen from Fig. 3 that the spacing device 24 extends upwards through an opening in the carrier beam 6. To avoid leakage of gases from the area just above the ra- dial sealing device 2 a cylindrical bellows 41 is provided as sealing element between the housing 25 and the supporting beam 6.

Claims

C L A I M S
1. A renegerative heat exchanger comprising a heat ex¬ changer matrix (1) in form of a rotor having at each end a smooth, axial face (13) at the periphery, and at each end a radial sealing device (2;15) which by means of a counter¬ weight (10,23) over a link connection (7,20) is kept against the rotor, as well as a spacing device (24) for controlling the axial distance between the radial sealing device and the rotor, c h a r a c t e r i z e d in that the spacing device com¬ prises a slide shoe (33) of carbon which protrudes from the radial sealing device and bears against the smooth axial face of the rotor, and in that the protrusion of the slide shoe relative to the housing is adjustable.
2. A regenerative heat exchanger according to claim 1, c h a r a c t e r i z e d in that the slide shoe (33) during operation is fixed against against turning relative to the rotor.
3. A regenerative heat exchanger according to claim 1 or 2, c h a r a c t e r i z e d in that the force, by which a slide shoe (33) is urged against the smooth face (13) of the rotor (1) is less than 50 kg.
4. A regenerative heat exchanger according to any of the preceding claims, c h a r a c t e r i z e d in that the spacing device (24) comprises a housing (25) mounted on the face of the radial sealing device (2;15) opposite the axial face (13) of the rotor (1) , that the radial sealing device is provided with an opening, through which the slide shoe (33) protrudes, that the slide shoe is mounted at one end of a spindle (28) which is axially movable in the housing and which at its other end has a thread (2) engaging a corre¬ sponding thread in the housing, and in that the threaded end of the spindle is adapted to engage an adjustment tool and is provided with a thread for a counternut (31) for locking the position of the spindle.
EP93914650A 1992-07-07 1993-07-06 Regenerative heat exchanger Expired - Lifetime EP0601167B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK089292A DK168649B1 (en) 1992-07-07 1992-07-07 Regenerative heat exchanger
DK892/92 1992-07-07
PCT/DK1993/000228 WO1994001730A1 (en) 1992-07-07 1993-07-06 Regenerative heat exchanger

Publications (2)

Publication Number Publication Date
EP0601167A1 true EP0601167A1 (en) 1994-06-15
EP0601167B1 EP0601167B1 (en) 1995-12-06

Family

ID=8098719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93914650A Expired - Lifetime EP0601167B1 (en) 1992-07-07 1993-07-06 Regenerative heat exchanger

Country Status (7)

Country Link
EP (1) EP0601167B1 (en)
AT (1) ATE131280T1 (en)
DE (1) DE69300967T2 (en)
DK (1) DK168649B1 (en)
ES (1) ES2080623T3 (en)
PL (1) PL171829B1 (en)
WO (1) WO1994001730A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504008C2 (en) * 1995-02-10 1996-10-14 Ljungstroem Technology Ab Rotary, regenerative heat exchanger where the clearance between sector plate and rotor is maintained with the help of a gas cushion, and ways to operate such a heat exchanger
SE503962C2 (en) * 1995-02-10 1996-10-07 Ljungstroem Technology Ab Regenerative heat exchanger and a way to operate a regenerative heat exchanger
SE504019C2 (en) * 1995-02-24 1996-10-21 Ljungstroem Technology Ab Rotating regenerative heat exchanger and ways to control such a heat exchanger
SE504462C2 (en) * 1995-06-08 1997-02-17 Ljungstroem Technology Ab Regenerative, rotary heat exchanger with control that prevents drag of slip shoe
US5845700A (en) * 1996-10-31 1998-12-08 Ljungstrom Technology Ab Rotary regenerative heat exchanger

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL95726C (en) * 1956-02-27
DE1035843B (en) * 1956-04-12 1958-08-07 Kraftanlagen Ag Circumferential regenerative preheater with movable sector plates and roller bodies
DE1133850B (en) * 1961-02-21 1962-07-26 Kraftanlagen Ag Adjustment device for the sector plates with circulating regenerative preheaters
US3246686A (en) * 1962-03-05 1966-04-19 Svenska Rotor Maskiner Ab Regenerative preheater including heat transfer mass and floating sealing plates
JPS4987548U (en) * 1972-11-20 1974-07-30
US4024907A (en) * 1976-01-08 1977-05-24 The Air Preheater Company, Inc. Sealing plate support

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9401730A1 *

Also Published As

Publication number Publication date
ES2080623T3 (en) 1996-02-01
PL171829B1 (en) 1997-06-30
EP0601167B1 (en) 1995-12-06
DK89292D0 (en) 1992-07-07
PL302676A1 (en) 1994-08-08
DE69300967D1 (en) 1996-01-18
DE69300967T2 (en) 1996-08-29
DK168649B1 (en) 1994-05-09
DK89292A (en) 1994-01-08
ATE131280T1 (en) 1995-12-15
WO1994001730A1 (en) 1994-01-20

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