US3891029A - Rotor assembly for vertical shaft air preheater - Google Patents

Rotor assembly for vertical shaft air preheater Download PDF

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Publication number
US3891029A
US3891029A US439506A US43950674A US3891029A US 3891029 A US3891029 A US 3891029A US 439506 A US439506 A US 439506A US 43950674 A US43950674 A US 43950674A US 3891029 A US3891029 A US 3891029A
Authority
US
United States
Prior art keywords
rotor
rotor post
post
heat exchange
basket
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
US439506A
Other languages
English (en)
Inventor
Robert E Mahoney
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
Air Preheater Co 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 Air Preheater Co Inc filed Critical Air Preheater Co Inc
Priority to US439506A priority Critical patent/US3891029A/en
Priority to CA214,758A priority patent/CA996922A/en
Priority to ZA00750257A priority patent/ZA75257B/xx
Priority to IN88/CAL/75A priority patent/IN142391B/en
Priority to AU77342/75A priority patent/AU483504B2/en
Priority to GB2297/75A priority patent/GB1500193A/en
Priority to FR7502334A priority patent/FR2260075B1/fr
Priority to OA55400A priority patent/OA04956A/xx
Priority to JP50013489A priority patent/JPS50109547A/ja
Priority to DE2504325A priority patent/DE2504325C2/de
Priority to NLAANVRAGE7501308,A priority patent/NL173554C/xx
Application granted granted Critical
Publication of US3891029A publication Critical patent/US3891029A/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
    • 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
    • Y10S165/013—Movable heat storage mass with enclosure
    • Y10S165/016—Rotary storage mass

Definitions

  • This application relates to a rotor for a rotary regenerative heat exchanger that is arranged around a vertically disposed rotor post.
  • the rotor is comprised of independent sector-shaped baskets of heat absorbent element that are affixed at a pair of axially spaced locations to the rotor post.
  • the baskets depending from a central rotor post usually comprise radially disposed diaphragms having a sectorial spacing therebetween forming baskets that are adapted to carry a mass of heat absorbent element.
  • the diaphragms are attached continuously by rigid welding to the rotor post whereby the post must be comprised of a heavy forging or the like capable of supporting the continuously welded member.
  • a rotor so constructed is structurally massive, heavy and therefore expensive because of the excessive amount of material used and welding required.
  • such a rotor is subject to premature cracking and failure of weldments because the integrally welded joints are subjected to differential expansion as they traverse various temperature zones.
  • the present invention is accordingly directed to a rotary regenerative heat exchange device that carries a mass of heat absorbent material alternately between a cold fluid and a hot fluid in order that heat from the hot fluid may be transferred to the cold fluid, and in particular it relates to a rotary regenerative heat exchanger that has a vertical shaft and is adapted to rotate about a vertical axis.
  • the heat absorbent material is carried in baskets supported by the rotor shaft at the axial ends thereof as a force couple whereby the load at the top of the rotor post is directed radially outward and the load at the bottom thereof is directed radially inward.
  • the rotor is surrounded by a housing formed with end plates at spaced ends that have openings to simultaneously direct a hot fluid and a cold fluid through spaced compartments of the rotor, and it includes a series of independent sector-shaped baskets of element that are supported by the rotor post.
  • the baskets are supported by the rotor post only at their axially disposed ends while the space therebetween remains entirely free from contact to permit relative movement without inducing structural breakage of a weld or other bonding means that may be used to connect the rotor baskets to the rotor post.
  • all components of the rotor may be shop fabricated, field work required to assemble the unit is minimized, erection time greatly reduced, and a substantial economy of manufacturing and assembly costs may be realized.
  • FIG. 1 is a sectional elevation of a heat exchanger constructed in accordance with the present invention
  • FIG. 2 is an enlarged side elevation of a means of attaching an element basket to a rotor post
  • FIG. 3 is an enlarged sectional view showing the details of a modified form of basket attachment
  • FIG. 4 is a plan view of a plurality of adjacent rotor sectors.
  • the arrangement of the drawing shows a rotary regenerative heat exchanger having a rotor post 12 supported by bearings 14 disposed for rotation about a vertical axis.
  • the rotor is rotated about its axis by means of a drive motor and suitable reduction gearing 18 that is connected to the rotor post.
  • a mass of heat exchange material 20 is contained in independent, open-ended sector-shaped baskets 22 that are in turn secured to the rotor post.
  • a composite rotor so formed is enclosed by housing 26 that has spaced openings 32, 34, 35 and 37 at opposite ends thereof to direct hot and cold fluids through the heat exchange material in spaced parts of the rotor.
  • I provide an arrangement whereby the rotor baskets are secured only to the ends of the rotor post with the intermediate portion of each basket entirely unsecured.
  • the central portion of each rotor basket and the rotor post are free to move relative to one another, and only the ends of the rotor post that actively support the rotor need be constructed of structurally heavy material for connection to the rotor trunnion 38.
  • Circumferential seals 40 positioned around the end edges of the rotor together with radial seals 42 between adjacent ends of the rotor baskets are adapted to rub against the inner surface of the rotor housing and preclude the flow of fluid therethrough.
  • the rotor is comprised essentially of a plurality of independent sector-shaped rotor baskets that are each secured at their inner ends to the rotor post and at their outer ends to one another.
  • Each rotor basket includes an upper or tension fitting 44 and a lower or compression fitting 46.
  • the fittings each are sized to fit between the radially extending sides 48 of the individual baskets where they are welded securely thereto to form an integral assembly.
  • the radial inner end of each fitting extends beyond the edge of each basket and is provided with an axially disposed aperture 52 whereby it may be aligned with a matching opening 54 of an upper bracket 56 located on the periphery of the rotor post. After the apertures are aligned they are linked together with a tension pin 62 at the top of the rotor.
  • a similar arrangement is made with a pin linking the fitting 46 and bracket 58 at the bottom of the rotor post.
  • the upper post fitting 56 and the lower post fitting 58 each comprise an annular member that has a U-shaped configuration adapted to receive the tension fitting 44 and the compression fitting 46.
  • the annular post fittings 56 and 58 may comprise heavy members attached to the outer periphery of the rotor post, or they may be otherwise formed as solid members integral with the rotor post.
  • the distance d between basket fittings 44 and 46 is somewhat greater than the distance d between post fittings 56 and 58 on the element baskets whereby the distances d and d may vary due to differential expansion or contraction without producing binding or any contact between the interface of the fittings and their respective brackets.
  • Each post fitting 56 and 58 is U-shaped in order that the pins 62 linking aligned openings in the bracket and engaging fitting are subjected to a double shear force, both above and below their contact with the rotor fittings 44 and 46.
  • Rotary regenerative heat exchange apparatus having a central rotor post disposed about a vertical axis, a plurality of independent sector-shaped baskets arranged in side-by-side relation to comprise an annular rotor around the rotor post, a mass of heat absorbent material contained in the several baskets of the rotor, housing means surrounding the rotor having inlet and outlet openings that direct a heating fluid and a fluid to be heated through the heat absorbent material of the rotor, means for rotating the rotor about its vertical axis, pivot means for attaching the element baskets to the rotor post comprising a tension fitting connecting the upper extremity of each rotor basket and the rotor post and a compression fitting intermediate the lower extremity of each basket and the rotor post whereby each basket is held in position adjacent the rotor post by a combination of forces transmitted by the tension member and the compression member.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the means for attaching the upper and lower extremeties of the element baskets to the rotor post comprise radially displaced means that permit each basket to move about an axis that is displaced from the axis of the rotor post.
  • Rotary regenerative heat exchange apparatus as defined in claim 2 including axially displaced pivot means wherein the pivot means moves about an axis that is parallel to the axis of the rotor post.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the pivot means at the lower end of the rotor comprises a projection that is directed radially inward to direct a compressive force from the element basket, and means on the rotor post adapted to receive the compressive force of said projection and limit its movement radially inward.
  • Rotary regenerative heat exchange apparatus as defined in claim 4 wherein the projection that extends from the bottom of the element basket is tapered about a horizontal axis to mate with the receiving means on the rotor post to simultaneously impart a radial and an axial component of force to the element basket.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the pivot that extends from the top of the element basket includes a projection that comprises a tie member secured to the element basket including a vertically disposed aperture therein, a fitting on the rotor post, and a shear pin linking the tie member and the fitting on the rotor post to rotatably link the tension fitting to the rotor post.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the compression fitting comprises an annular fitting including an outward facing groove that surrounds the rotor post.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the compression fitting comprises an annular fitting that surrounds the rotor post shaped as a frustom of a cone with the base thereof adjacent the bottom of the rotor.
  • Rotary regenerative heat exchange apparatus as defined in claim 1 wherein the tension fitting includes a member having U-shaped configuration that recieves the tie member on the element basket.
  • Rotary regenerative heat exchange apparatus as defined in claim 9 wherein the U-shaped tension member receives the tie member loosely between ends thereof to permit relative axial movement of element baskets and rotor post.

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)
US439506A 1974-02-04 1974-02-04 Rotor assembly for vertical shaft air preheater Expired - Lifetime US3891029A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US439506A US3891029A (en) 1974-02-04 1974-02-04 Rotor assembly for vertical shaft air preheater
CA214,758A CA996922A (en) 1974-02-04 1974-11-27 Rotor assembly for vertical shaft air preheater
ZA00750257A ZA75257B (en) 1974-02-04 1975-01-14 Rotor assembly for vertical shaft air preheater
IN88/CAL/75A IN142391B (it) 1974-02-04 1975-01-15
AU77342/75A AU483504B2 (en) 1974-02-04 1975-01-15 Rotor assembly for vertical shaft air preheater
GB2297/75A GB1500193A (en) 1974-02-04 1975-01-20 Rotary regenerative heat exchangers
FR7502334A FR2260075B1 (it) 1974-02-04 1975-01-24
OA55400A OA04956A (fr) 1974-02-04 1975-02-03 Rotor pour générateur thermique à arbre vertical.
JP50013489A JPS50109547A (it) 1974-02-04 1975-02-03
DE2504325A DE2504325C2 (de) 1974-02-04 1975-02-03 Drehspeicherwärmetauscher
NLAANVRAGE7501308,A NL173554C (nl) 1974-02-04 1975-02-04 Rotatie-regeneratieve warmteuitwisselinrichting.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US439506A US3891029A (en) 1974-02-04 1974-02-04 Rotor assembly for vertical shaft air preheater

Publications (1)

Publication Number Publication Date
US3891029A true US3891029A (en) 1975-06-24

Family

ID=23744983

Family Applications (1)

Application Number Title Priority Date Filing Date
US439506A Expired - Lifetime US3891029A (en) 1974-02-04 1974-02-04 Rotor assembly for vertical shaft air preheater

Country Status (10)

Country Link
US (1) US3891029A (it)
JP (1) JPS50109547A (it)
CA (1) CA996922A (it)
DE (1) DE2504325C2 (it)
FR (1) FR2260075B1 (it)
GB (1) GB1500193A (it)
IN (1) IN142391B (it)
NL (1) NL173554C (it)
OA (1) OA04956A (it)
ZA (1) ZA75257B (it)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998266A (en) * 1975-04-14 1976-12-21 The Air Preheater Company, Inc. Compartment support for vertical shaft air preheater
US4000775A (en) * 1975-04-24 1977-01-04 The Babcock & Wilcox Company Heat exchanger structure
FR2551850A1 (fr) * 1983-09-09 1985-03-15 Air Preheater Procede de construction d'un ensemble cylindrique de rotor pour un echangeur de chaleur regeneratif rotatif
WO1997031234A1 (en) * 1996-02-22 1997-08-28 Abb Air Preheater, Inc. Air preheater with semi-modular rotor construction
WO1997047938A1 (en) * 1996-06-14 1997-12-18 Abb Air Preheater, Inc. Rotor post with floating tensile header
US6257318B1 (en) * 2000-07-13 2001-07-10 Abb Alstom Power N.V. Basket design and means of attachment for horizontal air preheaters
US6422299B1 (en) * 2001-11-06 2002-07-23 Thermotech Enterprises, Inc. Wheel system for an air handling unit
US6422298B1 (en) * 2000-08-22 2002-07-23 Alstom Power N.V. Air preheater rotor construction
US6672369B1 (en) * 2003-02-27 2004-01-06 Alstom (Switzerland) Ltd Semi-modular rotor module
US20100243198A1 (en) * 2009-03-24 2010-09-30 Alstom Technology Ltd Apparatus and method for modifying a modular air preheater
US20170108287A1 (en) * 2014-06-13 2017-04-20 Amarant Industri Ab Thermal wheel
US20190154355A1 (en) * 2016-04-05 2019-05-23 Arvos Ljungstrom Llc Rotor for a rotary pre-heater for high temperature operation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418742A (en) * 1982-06-07 1983-12-06 The Babcock & Wilcox Company Rotor construction for rotary regenerative air heater

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981521A (en) * 1957-08-23 1961-04-25 Air Preheater Rotary disc regenerator
US3216486A (en) * 1963-09-19 1965-11-09 Air Preheater Rotary heat exchanger
US3267562A (en) * 1963-04-29 1966-08-23 Air Preheater Rotor assembly
US3391727A (en) * 1966-11-14 1968-07-09 Ford Motor Co Disc type rotary heat exchanger
US3710850A (en) * 1971-08-04 1973-01-16 Air Preheater Unrestrained rotor
US3789916A (en) * 1971-04-06 1974-02-05 Munters Ab Carl Rotor for exchangers of the thermodynamic characteristics of two gas currents

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981521A (en) * 1957-08-23 1961-04-25 Air Preheater Rotary disc regenerator
US3267562A (en) * 1963-04-29 1966-08-23 Air Preheater Rotor assembly
US3216486A (en) * 1963-09-19 1965-11-09 Air Preheater Rotary heat exchanger
US3391727A (en) * 1966-11-14 1968-07-09 Ford Motor Co Disc type rotary heat exchanger
US3789916A (en) * 1971-04-06 1974-02-05 Munters Ab Carl Rotor for exchangers of the thermodynamic characteristics of two gas currents
US3710850A (en) * 1971-08-04 1973-01-16 Air Preheater Unrestrained rotor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998266A (en) * 1975-04-14 1976-12-21 The Air Preheater Company, Inc. Compartment support for vertical shaft air preheater
US4000775A (en) * 1975-04-24 1977-01-04 The Babcock & Wilcox Company Heat exchanger structure
FR2551850A1 (fr) * 1983-09-09 1985-03-15 Air Preheater Procede de construction d'un ensemble cylindrique de rotor pour un echangeur de chaleur regeneratif rotatif
US4773145A (en) * 1983-09-09 1988-09-27 The Air Preheater Company, Inc. Method of constructing a cylindrical rotor assembly for a rotary regenerative heat exchanger
WO1997031234A1 (en) * 1996-02-22 1997-08-28 Abb Air Preheater, Inc. Air preheater with semi-modular rotor construction
AU723053B2 (en) * 1996-02-22 2000-08-17 Alstom Power Inc. Method of fabricating a rotor for a rotary regenerative air preheater
WO1997047938A1 (en) * 1996-06-14 1997-12-18 Abb Air Preheater, Inc. Rotor post with floating tensile header
US6257318B1 (en) * 2000-07-13 2001-07-10 Abb Alstom Power N.V. Basket design and means of attachment for horizontal air preheaters
US6422298B1 (en) * 2000-08-22 2002-07-23 Alstom Power N.V. Air preheater rotor construction
US6422299B1 (en) * 2001-11-06 2002-07-23 Thermotech Enterprises, Inc. Wheel system for an air handling unit
US6672369B1 (en) * 2003-02-27 2004-01-06 Alstom (Switzerland) Ltd Semi-modular rotor module
US20100243198A1 (en) * 2009-03-24 2010-09-30 Alstom Technology Ltd Apparatus and method for modifying a modular air preheater
US8327919B2 (en) * 2009-03-24 2012-12-11 Alstom Technology Ltd Apparatus and method for modifying a modular air preheater
US20170108287A1 (en) * 2014-06-13 2017-04-20 Amarant Industri Ab Thermal wheel
US20190154355A1 (en) * 2016-04-05 2019-05-23 Arvos Ljungstrom Llc Rotor for a rotary pre-heater for high temperature operation
US11137217B2 (en) * 2016-04-05 2021-10-05 Arvos Ljungstrom Llc Rotor for a rotary pre-heater for high temperature operation

Also Published As

Publication number Publication date
FR2260075A1 (it) 1975-08-29
DE2504325C2 (de) 1984-12-20
FR2260075B1 (it) 1977-07-01
ZA75257B (en) 1976-01-28
JPS50109547A (it) 1975-08-28
DE2504325A1 (de) 1975-08-07
NL173554C (nl) 1984-02-01
GB1500193A (en) 1978-02-08
CA996922A (en) 1976-09-14
OA04956A (fr) 1980-10-31
IN142391B (it) 1977-07-02
NL7501308A (nl) 1975-08-06
AU7734275A (en) 1976-07-15

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