US3799241A - Regenerative air preheater - Google Patents

Regenerative air preheater Download PDF

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Publication number
US3799241A
US3799241A US00241604A US24160472A US3799241A US 3799241 A US3799241 A US 3799241A US 00241604 A US00241604 A US 00241604A US 24160472 A US24160472 A US 24160472A US 3799241 A US3799241 A US 3799241A
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US
United States
Prior art keywords
air preheater
carrier
rotatable
regenerative air
matrix
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
US00241604A
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English (en)
Inventor
S Schluter
G Kritzler
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.)
Apparatebau Rothemuehle Brandt and Kritzler GmbH
Original Assignee
Apparatebau Rothemuehle Brandt and Kritzler GmbH
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 Apparatebau Rothemuehle Brandt and Kritzler GmbH filed Critical Apparatebau Rothemuehle Brandt and Kritzler GmbH
Application granted granted Critical
Publication of US3799241A publication Critical patent/US3799241A/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
    • F28D19/041—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 with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F28D19/044—Rotors; Assemblies of heat absorbing masses shaped in sector form, e.g. with baskets
    • 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
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • F28D17/02—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using rigid bodies, e.g. of porous material
    • 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
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • F28D17/02—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using rigid bodies, e.g. of porous material
    • F28D17/023—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
    • Y10S165/037—Heat exchange having a solid heat storage mass for absorbing heat from one fluid and releasing it to another, i.e. regenerator having flow diverting means, e.g. valve to selectively control flow through storage mass
    • Y10S165/038—Correlated control of plural diverting means
    • Y10S165/039—Synchronously rotated flow guiding hoods disposed on opposite sides of fixed regenerator

Definitions

  • a rotatable heatexchange element carrier is provided at the cold end of the regenerator chamber.
  • the chamber wall has an aperture opposite the carrier through which access can be had to the heat-exchange elements in the carrier for their radial installation or removal.
  • the invention relates to a regenerative air preheater having a cylindrical regenerator chamber, one of the heat exchanging gases being led to and away from the axial ends of the chamber by coaxial rotating hoods.
  • the heated elements which may be metal or ceramic are contained in prefabricated units of convenient size. Hitherto the units have been installed in or removed from the stationary regenerative chamber from the gas inlet or outlet ducts. This requires stoppage of the preheaters operation.
  • a regenerative air preheater having a cylindrical regenerator chamber having two axial ends one being a hot end and the other a cold end, a coaxial rotatable hood at each said axial end to lead one of the heating gas and the heat-receiving gas to and away from the ends, a wall surrounding the said chamber, and an aperture of restricted arc length in the said wall adjacent the cold end, the said chamber being subdivided axially into two parts, both containing heater elements having heat exchanging surfaces, the said part at the cold end containing a rotatable heater element carrier, whereby access can be had selectively to the said heater elements in the said rotatable carrier through the said aperture for their radial installation or removal.
  • the rotatable part of the chamber is about 20 to 35 percent of the total axial length of the chamber between the hot and cold ends.
  • the rotatable carrier is partitioned by radial walls providing wedge shaped spaces, so that for installation and removal of assembled units of cold end heat-exchange units one such wedge shaped space is always presented to the access aperture.
  • a disconnectable reduction drive from the hood drive is provided for driving the said carrier in rotation.
  • FIG. 1 is a sectional elevation through the axis of a regenerative air preheater.
  • FIG. 2 is a sectional view showing on the left a section through the regenerative chamber of the heater of FIG. 1 along the line ll of FIG. 1 and on the right a section through the rotatable part of the chamber along the line II-ll of FIG. 1.
  • FIG. 3 is, on a larger scale, a detail from FIG. 1.
  • FIG. 4 is a section through FIG. 3 along the line III- III including inserted heating element units packets 31, 32, 33.
  • FIG. 5 is a section along the line IV-IV of FIG. 4 on a larger scale.
  • FIG. 6 is a detail A from FIG. 2 showing in sectional view the locating elements.
  • FIG. 7 is a front-elevation detail, similar to FIG. 3, of an alternative embodiment where upper and lower isolating dampers 52, 53 are provided, which isolate the sector,in which the installation or removal of cold end heating element units packets is being effected.
  • FIG. 8 is a plan view of the upper damper 52 of FIG. 7.
  • FIG. 9 is a section along the line VIVI of FIG. 7 showing the lower damper 53.
  • the axis of the regenerative chamber is vertical and the cold end is located at the bottom.
  • the heating gases are led to the stationary cylindrical regenerative chamber from above through the fixed heating gas inlet duct 41 in direction of arrow 42. They flow through the upper, stationary part of the regenerative matrix 1 and a lower, rotatable heat-exchange element carrier 7, which they leave through the rigid lower heating gas outlet duct 43.
  • the air to receive heat, flows in the opposite direction from a lower rotatable air hood 44 through the rotatable carrier 7 and the upper stationary part of the regenerative matrix 1 towards an upper rotatable air hood 45 and from there into the stationary hot air duct, which has not been illustrated.
  • the two air hoods 44, 45 are mounted for rotation coaxially in the cylindrically shaped regenerative chamber on a common shaft 46. Each connects two segment-shaped areas on each axial end surface of the regenerative matrix 1 with central air inlet and outlet openings of the stationary air ducts (not shown).
  • the drive of the air hood shaft 46 is effected by a spur gear 47 at the circumference of the lower air hood 44 which engages a lateral gear 48 driven by a motor.
  • the non-rotating part of the regenerative matrix 1 in the region of the upper hot zone is subdivided over its height 11 by fixed radial partition walls 2 and cylindrical intermediate walls 5, 6 giving segment-shaped chambers in which assemblies of metal heating elements 36, 37, 38 are arranged for heat exchange in the axial direction.
  • the rotatable carrier 7 at the cold end of the matrix.
  • the carrier 7 extends over a height h of the regenerative chamber 1.
  • the carrier 7 there are units comprising assemblies of cold end heating surface elements 31, 32, 33 which units can be installed radially from outside the chamber through an aperture 40 in the chamber wall 4 of the regenerator chamber.
  • the height h of the rotatable carrier 7 amounts to about 20 to 35 percent of the total height H of the stationary regenerative matrix l.
  • the aperture 40 is closed by a removable door and is of arcuate length slightly greater than the width of the largest heat exchange element unit 31. Rotation of the carrier 7 makes each radial set of units 31, 32, 33
  • annuli 8 and 8a can be connected as shown by further stiffening elements and form a rigid support for a detachably fixed inner bearing-ring 10 carrying the rotatable carrier 7.
  • FIG. 3 shows a possible way of attaching by means of bolts 11 the inner bearing ring 10 to the annuli 8, 8a.
  • the bearing ring 10 has approximately an L-shape in section and provides a shoulder facing away from the cold end on which the hub 12 of the rotatable carrier 7 is supported for rotation coaxially with the wall of the regenerative matrix 1 on rollers or other bearing elements 13.
  • the rotatable cold end carrier 7 consists of the inner hub 12 and radial partition walls 2a, which are fixed thereon in a detachable manner. At their lower edges these sector partition walls 2a are detachably connected to each other by flat bars 14, 15, 16, which are arranged chordally, and by diagonal reinforcement bars 14a, 15a, 16a bracketing the bars 14, 15, 16, to the radial walls 2a.
  • the number and angular spacing of the radial partition walls 2a are the same as that of the walls 2 of the stationary part of the matrix with which in operation they can be kept in axial alignment by means of releasable locating elements 50 which lock the carrier 7 against rotation (see FIG. 6) in selected positions.
  • FIG. 6 also shows one of a plurality of resilient metal-plate strips 27, with which the radial partition walls 2a are provided at their radially outer edges and which abut sealingly against the inner side of the outer chamber wall 4 of the regenerative chamber.
  • the rotatable carrier 7 can be detachably coupled for rotation to the cold end hood 44.
  • one sector-shaped metal slide plate (damper) 52, 53 is radially inserted on each side of the rotatable carrier 7, one above and one below the region in which the replacement of the cold end supported on the lower flat bars 14, 15, 16 and 14a,
  • FIG. 5 there is represented an arrested position of the rotatable cold end carrier 7 in which the upper and lower sector partition walls 2, 2a lie in common radial planes.
  • replaceable elastic sealing lamellae 25 are arranged for sealing and in gas-tight manner abut against U-shaped wear shoes 26 which are fixed on and enclose the lower edges of the stationary partition walls 2.
  • This Figure shows furthermore the section through a cold end heating element unit 32, in which the metal heat-exchange elements have been represented, however, only schematically as have the lower diagonal flat bars 15a on which this unit is supported.
  • the locating pin 50
  • heating surface units is effected i.e. above and below the aperture 40 through which the units pass.
  • flat bars 14b, 15b arranged in parallel and in chordal directions are fixed in the upper, stationary part of the regenerative matrix 1 below the lower edges of the circumferential stationary chamber walls 5 and 6.
  • the spacing of the flat bars 14b, 15b from the lower edges of the walls 5, 6 is only a little greater than the thickness of the upper metal slide plate 52.
  • the slide plate 52 is inserted into the chamber through a slot 52a in the regenerative chamber wall 4. It is supported on the flat bar webs 14b, 15b and at its sides its radial edges closely fit against to the fixed radial partition walls 2 in a sealing manner.
  • the advantages achieved by this invention consist in that the installation and the removal of the heating surface elements and of their supporting structure in the region of the cold end zone, which elements and structure are particularly endangered by corrosion, can be effected in a radially direction from the outside through the aperture 40 of the regenerative chamber in a comparatively short time and that, if required, operation of the regenerative air preheater can be continued during performance of these operations.
  • a regenerative air preheater having a cylindrical regenerator matrix having two axial ends one being a hot end and the other a cold end, the said matrix being stationary during operation of the preheater, a coaxial rotatable hood at each said axial end to lead one of the heating gas and the heat-receiving gasto and away from the ends, a stationary wall surrounding the said matrix, and an aperture of restricted arc length in the said wall adjacent the cold end only, the said matrix being subdivided axially into two parts, both containing heat-exchange elements having heat exchanging surfaces, the said part at the hot end being fixedly stationary and the said part at the cold end including a rotatable heat-exchange element carrier axially aligned with the said aperture, whereby rotation of the said carrier selectively allows access to the said heat-exchange elements in the said rotatable carrier through the said aperture for their radial installation or removal.
  • a regenerative air preheater according to claim 1 wherein the heat exchange space of the said rotatable carrier is partitioned by radial walls into radially extending wedge-shaped spaces, each of which in turn can be accessible from the aperture.
  • a regenerative air preheater according to claim 4 wherein means are provided for closing off the axial ends of the said wedge-shaped space, which is accessible at a given time, comprising two damper plates insertable through slots to both axial sides of the apertures.
  • a regenerative air preheater according to claim 1 wherein the heat exchange elements carried by the said rotatable carrier are assembled in a plurality of structural units, each unit being removable through the said aperture.
  • Regenerative air preheater according to claim 1 wherein radial partition walls arranged in the stationary part of the cylindrical regenerative matrix are rigidly connected to the outer cylindrical chamber wall of the matrix and an inner cylindrical core of the stationary part of the matrix the said core being ended towards the cold end by a first annulus which is firmly Welded to the core and is reinforced by a second annulus which is rigidly secured to the core parallel to and axially beyond the first annulus, the spacing of the at a distance annuli being about 0.1 to 0.2 of the length of the stationary chamber part.
  • Regenerative air preheater according to claim 7 wherein the said annuli are at their circumference rigidly secured to the said cylindrical core and connected with each other by axial stiffening elements thereby forming a rigid supporting structure at the cold end of the core on which a coaxial inner bearing ring for the rotatable carrier is detachably fixed.
  • Regenerative air preheater according to claim 8 wherein the said inner bearing ring has inits radially outer face a shoulder facing towards the hot end on which a hub of the rotatable carrier is movably supported on rolling bearing elements.
  • Regenerative air preheater according to claim 4 wherein the said radial walls of the rotatable carrier are equally circuniferentially spaced and are secured at the inner hub of the carrier and at their bottom edges are detachably connected with each other by bars arranged in chordal directions said bars being at approximately equal radial distances from each other and being braced to adjoining sector partition walls through diagonally extending bars.
  • Regenerative air preheater according to claim 1 wherein at least one pair of radial partition walls of the rotatable carrier correspond in plan to at least one pair of radial partition walls in the non-rotatable part of the regenerator matrix there being means for holding releasably the rotatable carrier againstrotation with the sets of partition walls axially aligned.
  • Regenerative air preheater according to claim 1 wherein radial partition walls of the rotatable carrier are provided with resilient sealing elements which, in
  • Regenerative air preheater according to claim 1 wherein radial partition walls of the rotatable carrier are provided at vertically extending radially outermost edges with radially resilient vertically extending metal plate strips, which in gastight manner engage a peripherally inner cylindrical surface of the outer chamber wall around the cylindrical regenerator matrix.
  • Regenerative air preheater according to claim 1 wherein the rotatable carrier is detachably connectable to the rotatable cold end hood by means of at least two coupling links which are distributed at equal circumferential spacings on at the same radial'distance from the axis.
  • a regenerative air preheater having an operationally stationary axially divided cylindrical regenerator matrix in a stationary chamber, the improvement comprising a rotatable heat-exchange element carrier at the cold end only of the matrix and a closable aperture in the chamber wall at the cold end, access being possible selectively to peripheral portions of the rotatable carrier through the aperture by rotation of the carrier.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Air Supply (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
US00241604A 1971-04-06 1972-04-06 Regenerative air preheater Expired - Lifetime US3799241A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712116728 DE2116728A1 (de) 1971-04-06 1971-04-06 Regenerativ-Luftvorwärmer mit stationärer Regenerativ-Kammer und drehbarem Kaltendteil

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US3799241A true US3799241A (en) 1974-03-26

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US00241604A Expired - Lifetime US3799241A (en) 1971-04-06 1972-04-06 Regenerative air preheater

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US (1) US3799241A (de)
JP (1) JPS513070Y2 (de)
DE (1) DE2116728A1 (de)
GB (1) GB1330615A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106932A1 (de) * 1981-02-25 1982-09-09 Herbert Dipl.-Ing. 5960 Olpe Sandmann Tragkonstruktion in feststehender bauart (stator) fuer die speichermasse regenerativer luftvorwaermer mit senkrechter welle
US4383573A (en) * 1982-01-28 1983-05-17 Combustion Engineering, Inc. Rotary regenerative air heater
US6257318B1 (en) * 2000-07-13 2001-07-10 Abb Alstom Power N.V. Basket design and means of attachment for horizontal air preheaters
US6405789B1 (en) * 2001-05-10 2002-06-18 Alstom Power N.V. Combined basket removal door and platform for air preheaters
WO2003095921A1 (en) * 2002-05-07 2003-11-20 Megtec Systems, Inc. Heated seal air for valve and regenerative thermal oxidizer containing same
US20170131049A1 (en) * 2014-01-13 2017-05-11 General Electric Technology Gmbh Heat exchanger effluent collector

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545392Y2 (de) * 1973-12-25 1979-03-09
JPS5217983U (de) * 1975-07-25 1977-02-08
DE3140406C2 (de) * 1981-10-12 1985-03-07 Apparatebau Rothemühle Brandt + Kritzler GmbH, 5963 Wenden Regenerativ-Wärmeaustauscher zur getrennten Aufwärmung zweier parallel geführter Ströme eines wärmeaufnehmenden Mediums durch ein wärmeabgebendes Medium
JPS6039401U (ja) * 1983-08-25 1985-03-19 大和精機株式会社 自動盤におけるチヤツク装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB503857A (en) * 1937-10-15 1939-04-17 Howden James & Co Ltd Improvements in regenerative heat-exchangers
GB684797A (en) * 1949-11-04 1952-12-24 Ljungstroms Angturbin Ab Improvements in or relating to rotary regenerative heat exchangers
GB914273A (en) * 1960-05-04 1963-01-02 Archibald Johnstone Engineers Improvements in or relating to regenerative heat exchangers
GB1045974A (en) * 1962-04-26 1966-10-19 Svenska Rotor Maskiner Ab Rotary regenerative air preheater for operation at low exhaust gas temperatures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB503857A (en) * 1937-10-15 1939-04-17 Howden James & Co Ltd Improvements in regenerative heat-exchangers
GB684797A (en) * 1949-11-04 1952-12-24 Ljungstroms Angturbin Ab Improvements in or relating to rotary regenerative heat exchangers
GB914273A (en) * 1960-05-04 1963-01-02 Archibald Johnstone Engineers Improvements in or relating to regenerative heat exchangers
GB1045974A (en) * 1962-04-26 1966-10-19 Svenska Rotor Maskiner Ab Rotary regenerative air preheater for operation at low exhaust gas temperatures

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106932A1 (de) * 1981-02-25 1982-09-09 Herbert Dipl.-Ing. 5960 Olpe Sandmann Tragkonstruktion in feststehender bauart (stator) fuer die speichermasse regenerativer luftvorwaermer mit senkrechter welle
US4383573A (en) * 1982-01-28 1983-05-17 Combustion Engineering, Inc. Rotary regenerative air heater
US6257318B1 (en) * 2000-07-13 2001-07-10 Abb Alstom Power N.V. Basket design and means of attachment for horizontal air preheaters
US6405789B1 (en) * 2001-05-10 2002-06-18 Alstom Power N.V. Combined basket removal door and platform for air preheaters
WO2003095921A1 (en) * 2002-05-07 2003-11-20 Megtec Systems, Inc. Heated seal air for valve and regenerative thermal oxidizer containing same
US20050115696A1 (en) * 2002-05-07 2005-06-02 Cash James T. Heated seal air for valve and regenerative thermal oxidizer containing same
US7325562B2 (en) 2002-05-07 2008-02-05 Meggec Systems, Inc. Heated seal air for valve and regenerative thermal oxidizer containing same
US20170131049A1 (en) * 2014-01-13 2017-05-11 General Electric Technology Gmbh Heat exchanger effluent collector

Also Published As

Publication number Publication date
JPS513070Y2 (de) 1976-01-29
DE2116728A1 (de) 1972-10-19
JPS4726050U (de) 1972-11-24
GB1330615A (en) 1973-09-19

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