US2558752A - Regenerative heat exchanger - Google Patents

Regenerative heat exchanger Download PDF

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Publication number
US2558752A
US2558752A US37752A US3775248A US2558752A US 2558752 A US2558752 A US 2558752A US 37752 A US37752 A US 37752A US 3775248 A US3775248 A US 3775248A US 2558752 A US2558752 A US 2558752A
Authority
US
United States
Prior art keywords
plates
heat
rotor
tabs
passages
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
US37752A
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English (en)
Inventor
Holm Sven
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
Priority to NL71035D priority Critical patent/NL71035C/xx
Priority to BE490077D priority patent/BE490077A/xx
Application filed by Air Preheater Co Inc filed Critical Air Preheater Co Inc
Priority to US37752A priority patent/US2558752A/en
Priority to FR990436D priority patent/FR990436A/fr
Priority to DEP48373A priority patent/DE844630C/de
Priority to GB18250/49A priority patent/GB662375A/en
Application granted granted Critical
Publication of US2558752A publication Critical patent/US2558752A/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
    • 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
    • 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
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • F28G9/005—Cleaning by flushing or washing, e.g. with chemical solvents of regenerative heat exchanger
    • 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
    • Y10S165/01—Cleaning storage mass
    • Y10S165/011—Reciprocating cleaner device, e.g. scraper, sprayer
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49357—Regenerator or recuperator making

Definitions

  • the present invention relates to heat exchange apparatus and particularly to improvements n the heat absorbing surface of regenerative air preheaters.
  • a conventional regenerative air preheater of the Ljungstrom type includes a rotor carrying heat absorbing surface in the form of metallic plates that are first positioned in a gas passage to absorb heat and then upon turning of the rotor become disposed in the air passage to impart heat to air flowing therethrough.
  • heat absorbing surface requires periodical cleaning to remove ash and other impurities deposited thereon by the gases and for this purpose it is customary to use cleaning nozzles that provide streams of compressed air or high pressure steam jets.
  • Figure 1 is a plan view of a regenerative type air preheator equipped with washing nozzles.
  • FIG. 2 is a fragmentary perspective view on an enlarged scale of part of the heater shown in Fig. 1 illustrating the novel heat absorbing surface embodying the present invention
  • FIG. 3 is a further enlarged fragmentary perspective view showing an alternative form for the heat exchange plates
  • FIG. 4 illustrates a monolithic heat exchange mass made up of heat exchange plates embodying the invention.
  • Figure 5 is a diagram illustrating the heat exchange efliciency of the present plates as compared with conventional corrugated or undulated plates.
  • the numeral l0 designates the cylindricalshell of a rotor which is divided into sector shaped compartments II by radial partitions [2 connecting it with the rotor post l3.
  • a motor and reduction gearing l4 connected to the rotor post turn the rotor slowly about its axis.
  • the rotor compartments I I which may be further subdivided by a circumferential partition l5 contain regenerative heat transfer material in the form of metallic plates l6 which are spaced apart to form narrow passages parallel to the rotor axis.
  • the plates l6 first absorb heat from hot gases flowing through the gas passage ll of the preheater and, as the rotor turns slowly about its axis, the heated plates 16 are moved into the stream of air flowing through the air passage ll to-which a forced draft fan (not shown) is connected. After passing over the plates l6 and absorbing heat therefrom the stream of air is conveyed to a boiler furnace or other place of use.
  • a soot blower 20 has one or more rotary nozzles 24 disposed above the rotor so that jets of cleaning fluid under pressure may be directed into the passages between the plates for cleaning them as disclosed in the patent to Waitkus, 2,355,021, issued August 1, 1944.
  • the heat exchange plates l6 are each formed, preferably over their entire area, with a plurality of relatively small perforations 30 shown as arranged in parallel rows. These perforations are illustrated as of rectangular shape and are created by cutting through the plate material along opposite edges of the apertures and bending up the plate material so that the rectangular tab portions 3
  • , 32 are created adjacent each aperture by slitting the mid-portion of the material from the aperture parallel to its side edges 34 as well as along its top and bottom edges 35, 36 thus dividing the tab into two parts hinged at opposite edges of the perforation.
  • are connected to the body of the plate It only at one side edge 34 of the aperture 30.
  • heat exchange plates embodying the present invention When mounted in the compartments of a rotary regenerative air preheater, either throughout the height of the latter or, alternatively, only in the hot end section heat exchange plates embodying the present invention provide a heat absorbing surface which eliminates the stresses and shocks imposed on the plate material due to entry of high pressure steam into the passages between the plates as has been experienced heretofore because with the present plates the apertures 33 permit the steam to expand and pass through the plates instead of becoming confined and exerting a pressure on the surface of plates which strains them, subjects them to shock and vibration and eventually disrupts them.
  • , 32 extending from the sur- 3 faces of the. plates it serve useful functions, one being to act as spacers for holding the plates in properly spaced relation to form passages through the heat exchange mass without the use of specially provided separators.
  • . 32 is to increase the effectiveness of the heat exchange surfaces because they act as integral extensions of the plates and a greater efficiency is obtainable. than when the heat is exchanged merely by contact with the streams of fluid flowing in film contact with the plate surface itself.
  • the fact that the planar surface is interrupted at intervals by the tabs maintains a thin boundary layer that does not impede heat transfer.
  • more of the plate material is actually disposed in the stream of gases and by staggering the tabs projecting from the apertures as illustrated in Fig. 3 further efficiency is attainable because the streams of gases and air are continually interrupted and divided by contact with the staggered tabs in their passage through the rotor.
  • , 32 which are in alinement form interrupted strip fins in two planes extending both in the direction of gas flow and transversely thereof, considering the wider faces of the tabs as cross-sectional portions of transverse fins.
  • the tabs should extend in closely spaced relation parallel to the direction of flow to. provide free lanes therebetween for the flow of gases without producing an undesirable draft loss or causing useless turbulence since this is not desired.
  • FIG. 5 A comparison of the heat exchange efficiency of the present plates as compared with conventional Ljungstrom undulated plates is shown in Fig. 5 wherein film conductance is plotted against the product of friction power by the gas -density? squared.
  • a concomitant advantage of this marked increase in heat transfer efficiency is that for a given recovery the amount of plate surface of like gauge material required in a preheater is reduced by approximately fifty per cent (50%). This permits the height of the preheater rotor to be reduced (about or its diameter correspondingly lessened and itsvolume decreased (to about 68%). At the cold end greater heat transfer may be attained by increasing the gauge of the plates while at the same time reducing their height.
  • the weight of the preheater assembly is less with the result that a saving may also be effected in the structural steel supporting the unit. Less power also is required to operate the unit for driving it.
  • a unitary heatexchange mass may be produced.
  • This mass would be a unitary structure having a series of passages for gas flow parallel to the axis of the rotor which passages would be created by the spacing function of the tabs 3
  • such masses would have the considerable advantage of greatly reducing the time of erection of a preheater bedling or special bundling.
  • Figure 4 also illustrates a fin construction in which the metallic tab 3
  • a regenerative air preheater or the like having a cylindrical rotor divided by partitions into compartments that carry heat transfer material; a pressurized fluid jet apparatus disposed and arranged for cleaning said material; heat transfer plates disposed in said compartments parallel to the direction of fluid flow and closely spaced to form narrow fluid passages therebetween axially of the rotor, each plate being formed over substantially its entire area with a myriad of perforations uniformly distributed over the plate area in parallel rows permitting passage of fluid between said passages laterally through the plates for minimizing pressure effects on the plates caused by the cleaning jets.
  • a regenerative air preheater or the like having a cylindrical rotor divided by partitions into compartments that carry heat transfer material; heat transfer plates serving as primary surface disposed in said compartments parallel to the direction of fluid flow and closely spaced to form narrow fluid passages, each plate being formed over substantially its entire area with a myraid of closely spaced perforations arranged in parallel rows and the plate material from the perforations remaining to constitute tabs attached to the body of the plate along at least one edge of each aperture and being bent to extend therefrom into the passages provided between the plates for fluid flow and lie in planes parallel to the direction of fluid flow.
  • a monolithic primary heat exchange mass comprising a plurality of metallic plates each formed over substantially its entire area with relatively small apertures uniformly distributed in parallel rows the material from which remains as tabs attached at one edge of the apertures to the plates and is bent out perpendicular to the surface thereof to contact an adjacent plate for spacing adjacent plates to form fluid passages therebetween, the plates being bonded, as by brazing, into a unitary mass.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US37752A 1948-07-09 1948-07-09 Regenerative heat exchanger Expired - Lifetime US2558752A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL71035D NL71035C (nl) 1948-07-09
BE490077D BE490077A (nl) 1948-07-09
US37752A US2558752A (en) 1948-07-09 1948-07-09 Regenerative heat exchanger
FR990436D FR990436A (fr) 1948-07-09 1949-07-08 Perfectionnement aux échangeurs de chaleur
DEP48373A DE844630C (de) 1948-07-09 1949-07-10 Fuellmasse fuer Regenerativ-Waermeaustauscher
GB18250/49A GB662375A (en) 1948-07-09 1949-07-11 Improvements in or relating to heat exchange apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US37752A US2558752A (en) 1948-07-09 1948-07-09 Regenerative heat exchanger

Publications (1)

Publication Number Publication Date
US2558752A true US2558752A (en) 1951-07-03

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ID=21896120

Family Applications (1)

Application Number Title Priority Date Filing Date
US37752A Expired - Lifetime US2558752A (en) 1948-07-09 1948-07-09 Regenerative heat exchanger

Country Status (6)

Country Link
US (1) US2558752A (nl)
BE (1) BE490077A (nl)
DE (1) DE844630C (nl)
FR (1) FR990436A (nl)
GB (1) GB662375A (nl)
NL (1) NL71035C (nl)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680009A (en) * 1953-02-25 1954-06-01 Rca Corp Cooling unit
US2703700A (en) * 1950-11-22 1955-03-08 Modine Mfg Co Heat interchanger
US2988336A (en) * 1958-04-18 1961-06-13 Air Preheater Heat exchanger
US3211633A (en) * 1962-05-25 1965-10-12 Westinghouse Electric Corp Falling film distillation unit apparatus
US4405011A (en) * 1981-09-28 1983-09-20 The Air Preheater Company, Inc. Element basket
US5918368A (en) * 1997-08-27 1999-07-06 Solar Turbines, Inc. Method for making a recuperator cell
US5924478A (en) * 1997-05-08 1999-07-20 Caterpillar Inc. Radiator washing system and method
US6450245B1 (en) 2001-10-24 2002-09-17 Alstom (Switzerland) Ltd. Air preheater heat transfer elements
EP1623175A2 (en) * 2003-04-24 2006-02-08 Sunpower, Inc. Involute foil regenerator

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975689C (de) * 1952-02-15 1962-05-10 Kraftanlagen Ag Rieseleinbau mit gleichzeitig als Abstandshalter dienenden Rieselplatten
DE1196681B (de) * 1952-05-02 1965-07-15 Balcke Ag Maschbau Rieselflaechenkuehler
US2879979A (en) * 1956-11-08 1959-03-31 Byrhl F Wheeler Evaporative wheel
US2984457A (en) * 1958-04-09 1961-05-16 Vector Mfg Company Inc Heat radiator for electronic mounting components

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US715051A (en) * 1901-06-11 1902-12-02 Emile Marie Albert Gimmig Parcel-carrier.
US1873052A (en) * 1928-11-19 1932-08-23 Bush Mfg Company Radiator
US1983549A (en) * 1933-05-10 1934-12-11 Refrigeration Appliances Inc Radiator fin
US2347857A (en) * 1941-10-15 1944-05-02 Air Preheater Temperature zoned air preheater
US2428145A (en) * 1944-09-11 1947-09-30 Pacific Metals Company Ltd Heat transfer fin

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE723175C (de) * 1937-05-12 1942-07-30 Erik Torvald Linderoth Waermeaustauscher mit umlaufenden Speicherkoerpern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US715051A (en) * 1901-06-11 1902-12-02 Emile Marie Albert Gimmig Parcel-carrier.
US1873052A (en) * 1928-11-19 1932-08-23 Bush Mfg Company Radiator
US1983549A (en) * 1933-05-10 1934-12-11 Refrigeration Appliances Inc Radiator fin
US2347857A (en) * 1941-10-15 1944-05-02 Air Preheater Temperature zoned air preheater
US2428145A (en) * 1944-09-11 1947-09-30 Pacific Metals Company Ltd Heat transfer fin

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703700A (en) * 1950-11-22 1955-03-08 Modine Mfg Co Heat interchanger
US2680009A (en) * 1953-02-25 1954-06-01 Rca Corp Cooling unit
US2988336A (en) * 1958-04-18 1961-06-13 Air Preheater Heat exchanger
US3211633A (en) * 1962-05-25 1965-10-12 Westinghouse Electric Corp Falling film distillation unit apparatus
US4405011A (en) * 1981-09-28 1983-09-20 The Air Preheater Company, Inc. Element basket
US5924478A (en) * 1997-05-08 1999-07-20 Caterpillar Inc. Radiator washing system and method
US5918368A (en) * 1997-08-27 1999-07-06 Solar Turbines, Inc. Method for making a recuperator cell
US6158121A (en) * 1997-08-27 2000-12-12 Solar Turbines Incorporated Method and apparatus for making a recuperator cell
US6450245B1 (en) 2001-10-24 2002-09-17 Alstom (Switzerland) Ltd. Air preheater heat transfer elements
EP1623175A2 (en) * 2003-04-24 2006-02-08 Sunpower, Inc. Involute foil regenerator
EP1623175A4 (en) * 2003-04-24 2008-05-14 Sunpower Inc REGENERATOR WITH DEVELOPING SHEETS

Also Published As

Publication number Publication date
BE490077A (nl)
DE844630C (de) 1952-07-24
GB662375A (en) 1951-12-05
NL71035C (nl)
FR990436A (fr) 1951-09-21

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