EP0811143B1 - Rotary regenerative heat exchanger and a method for operating such heat exchanger - Google Patents
Rotary regenerative heat exchanger and a method for operating such heat exchanger Download PDFInfo
- Publication number
- EP0811143B1 EP0811143B1 EP96904422A EP96904422A EP0811143B1 EP 0811143 B1 EP0811143 B1 EP 0811143B1 EP 96904422 A EP96904422 A EP 96904422A EP 96904422 A EP96904422 A EP 96904422A EP 0811143 B1 EP0811143 B1 EP 0811143B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- front surface
- gas
- heat exchanger
- rotor
- rotary regenerative
- 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
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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 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.
- 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 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 of 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 distribution of the gas is promoted.
- 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).
- 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 due 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 of the gas keeps the front surface 12 of the sliding shoe 17 raised from the end surface 11 of the flange 9 against the action of the force from the bellow 21, so that the gas is allowed to escape 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 28 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 will receive a corresponding extension.
- Figs. 3 and 4 illustrate alternative shapes ofthe front surface 12', 12", respectively.
- the front surface 12' is rectangular, limited by two straight lines 13', 14', and in fig. 4 the front 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)
Description
Claims (8)
- Rotary regenerative heat exchanger having a substantially cylindrical rotor (2) mounted in a casing (1), which rotor (2) at at least one of its ends is provided with a circumferentially continuous external end surface (11), and which casing (1) is provided with plates (5, 6, 7, 8) at at least one of said rotor ends in an orientation substantially perpendicular to the axis of said rotor (2) and closed to the related rotor end, said plates (5, 6, 7, 8) including movable sector plates (6, 8), each said sector plate (6, 8) being affected by a resultant axial force towards the related rotor end and being provided with support means (10) for maintaining a certain clearance (S) between said sector plates (6, 8) and the related rotor end, said support means (10) including gas cushion means (17), each said gas cushion means (17) having a front surface (12) facing said end surface (11), said front surface (12) having gas outlet means (16), said gas outlet means communicating through gas conduit means (23, 24, 25, 26, 27) with a pressurized gas source (22) of a pressure sufficient to establish a gap between said front surface (12) and said end surface (11) against the action of said axial force, thereby creating a gas cushion between said front surface (12) and said end surface (11) as said gas escapes from said gas outlet means (16) through said gap, characterized in that the support means (10) of at least one of said sector plates (6, 8) consists of one single gas cushion means (17) and that the front surface (12) of said gas cushion means has an elongated shape, having its longer extension directed circumferentially along said end surface (11).
- Rotary regenerative heat exchanger according to claim 1, wherein said front surface (12) is radially limited by two concentric circular arcs (13, 14) and having substantially a sausage-shape.
- Rotary regenerative heat exchanger according to claim 1, wherein said front surface (12') is radially limited by two parallel straight lines (13', 14'), and having a substantially rectangular shape.
- Rotary regenerative heat exchanger according to claim 1, wherein said front surface (12") is radially limited by two non-concentric circular arcs (13", 14") and having substantially a crescent-shape.
- Rotary regenerative heat exchanger according to any of claims 1 to 4, wherein the angular extension of said front surface (12) is more than half the angular extension of said sector plate (6, 8), and said front surface (12) is symmetrically located relative to a radial symmetry (19) line in the plane of said sector plate (6, 8).
- Rotary regenerative heat exchanger according to any of claims 1 to 5, wherein said gas outlet means (16) is a groove extending in the longitudinal direction of said front surface (12).
- Rotary regenerative heat exchanger according to claim 1 or 2, wherein said front surface (12'") is a part of the internal surface (28) of said sector plate (6, 8).
- A method for operating a rotary regenerative heat exchanger to maintain a certain clearance (S) between one end of a substantially cylindrical rotor (2) of the heat exchanger and a movable sector plate (6, 8) located closed to said rotor end in an orientation substantially perpendicular to the axis of said rotor (2), said rotor end having a circumferentially continuous end surface (11), said rotor (2) being mounted in a casing (1) and said sector plate (6, 8) being connected to said casing and being affected by a resultant axial force towards said rotor end, said clearance (S) being maintained by supplying gas to support means (10) on said sector plate (6, 8) said support means (10) including gas cushion means (17) having a front surface (12) with gas outlet means (16) and facing said end surface (11), the pressure of said supplied gas being sufficient to establish a gap between said front surface (12) and said end surface (11) against the action of said axial force, thereby creating a gas cushion between said front surface (12) and said end surface (11) as said gas escapes from said gas outlet means (16) through said gap, characterized by supplying said gas to one single support means (10) and arranging said single support means (10) to form an elongated gas cushion, having its longer extension directed circumferentially along said end surface (11).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9500681A SE504019C2 (en) | 1995-02-24 | 1995-02-24 | Rotating regenerative heat exchanger and ways to control such a heat exchanger |
SE9500681 | 1995-02-24 | ||
PCT/SE1996/000232 WO1996026407A1 (en) | 1995-02-24 | 1996-02-21 | Rotary regenerative heat exchanger and a method for operating such heat exchanger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0811143A1 EP0811143A1 (en) | 1997-12-10 |
EP0811143B1 true EP0811143B1 (en) | 1999-11-24 |
Family
ID=20397345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96904422A Expired - Lifetime EP0811143B1 (en) | 1995-02-24 | 1996-02-21 | Rotary regenerative heat exchanger and a method for operating such heat exchanger |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0811143B1 (en) |
CZ (1) | CZ288346B6 (en) |
DE (1) | DE69605287T2 (en) |
DK (1) | DK0811143T3 (en) |
HU (1) | HU220316B (en) |
PL (1) | PL321714A1 (en) |
SE (1) | SE504019C2 (en) |
WO (1) | WO1996026407A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6749815B2 (en) | 2001-05-04 | 2004-06-15 | Megtec Systems, Inc. | Switching valve seal |
Families Citing this family (4)
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 |
US7150446B1 (en) | 2002-08-28 | 2006-12-19 | Megtec Systems, Inc. | Dual lift system |
US6669472B1 (en) | 2002-08-28 | 2003-12-30 | Megtec Systems, Inc. | Dual lift system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE973548C (en) * | 1952-09-16 | 1960-03-24 | Babcock & Wilcox Dampfkessel W | Circulating regenerative preheater for gas, air or the like. |
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 (en) * | 1992-07-07 | 1994-05-09 | Burmeister & Wains Energi | Regenerative heat exchanger |
ATE180325T1 (en) * | 1993-07-02 | 1999-06-15 | Berndt Lindstroem | REGENERATIVE HEAT EXCHANGER |
-
1995
- 1995-02-24 SE SE9500681A patent/SE504019C2/en not_active IP Right Cessation
-
1996
- 1996-02-21 EP EP96904422A patent/EP0811143B1/en not_active Expired - Lifetime
- 1996-02-21 WO PCT/SE1996/000232 patent/WO1996026407A1/en active IP Right Grant
- 1996-02-21 CZ CZ19972664A patent/CZ288346B6/en not_active IP Right Cessation
- 1996-02-21 PL PL96321714A patent/PL321714A1/en unknown
- 1996-02-21 HU HU9801281A patent/HU220316B/en not_active IP Right Cessation
- 1996-02-21 DE DE69605287T patent/DE69605287T2/en not_active Expired - Fee Related
- 1996-02-21 DK DK96904422T patent/DK0811143T3/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6749815B2 (en) | 2001-05-04 | 2004-06-15 | Megtec Systems, Inc. | Switching valve seal |
US6899121B2 (en) | 2001-05-04 | 2005-05-31 | Megtec Systems Inc. | Switching valve seal |
Also Published As
Publication number | Publication date |
---|---|
DE69605287T2 (en) | 2000-07-20 |
PL321714A1 (en) | 1997-12-22 |
HUP9801281A3 (en) | 1999-11-29 |
DK0811143T3 (en) | 2000-05-15 |
CZ266497A3 (en) | 1997-11-12 |
SE504019C2 (en) | 1996-10-21 |
HU220316B (en) | 2001-12-28 |
HUP9801281A2 (en) | 1998-08-28 |
EP0811143A1 (en) | 1997-12-10 |
DE69605287D1 (en) | 1999-12-30 |
WO1996026407A1 (en) | 1996-08-29 |
CZ288346B6 (en) | 2001-05-16 |
SE9500681D0 (en) | 1995-02-24 |
SE9500681L (en) | 1996-08-25 |
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