US3550922A - Fluidized bed for controlled heat treatment - Google Patents

Fluidized bed for controlled heat treatment Download PDF

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Publication number
US3550922A
US3550922A US710333A US3550922DA US3550922A US 3550922 A US3550922 A US 3550922A US 710333 A US710333 A US 710333A US 3550922D A US3550922D A US 3550922DA US 3550922 A US3550922 A US 3550922A
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US
United States
Prior art keywords
tunnel
conveyor
fluidized bed
particles
pipes
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
US710333A
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English (en)
Inventor
Hans Geipel
Eckehard Forster
Wilfried Heinemann
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.)
Huettenwerk Oberhausen AG
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Huettenwerk Oberhausen AG
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 Huettenwerk Oberhausen AG filed Critical Huettenwerk Oberhausen AG
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Publication of US3550922A publication Critical patent/US3550922A/en
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Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/84—Controlled slow cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/567—Continuous furnaces for strip or wire with heating in fluidised beds

Definitions

  • coils of steel wire to be subjected to controlled cooling are placed on an apertured conveyor passing through a tunnel into which solid ceramic particles entrained by a stream of carrier gas are admitted through a perforated base below the conveyor, the particles enveloping the conveyed goods and being then recirculated through a cooling chamber restoring their original temperature. Further cooling of the particles is effected by two sets of tubes traversing the tunnel below and above the conveyor, respectively.
  • the term fluidized bed denotes a mass of solid particles, such as ceramic granules, entrained by a current of a preferablyinert carrier gas.
  • the particles which should have an elevated heat-transfer, coefficient, serve as the principal constituent of the heating or coolingmedium whereas the carrier gas plays only a minor role in the maintenance of the desired discharge temperature.
  • This gasis also used as a vehicle for a continuous recirculation .of the particles through a heat-treating tunnel and. through an external reconditioning chamber where the particles are reheated or recooled to reestablish their original treatmenttemperature.
  • a more specific object is to provide auxiliary temperature control means for the purpose described which will not materially interfere with the flow of the particles or the movement of the goods through the tunnel.
  • each set of conduits may comprise a bank of horizontally juxtaposed pipes of ellipsoidal section traversing the tunnel either transversely or longitudinally, preferably the latter so that fluid may be circulated therethrough in counterflow to the goods.
  • the spacing of the pipessufficient to give passage to the rising particles need not be uniformand advantageously is reduced in regions of greater accumulation of the goods to be treated. thus near the longitudinal edges of the conveyor in the case of a system for the cooling of coiled wire or the like.
  • FIG. 2 is a cross-sectional view taken on the line II-II of FIG. 1.
  • the system shown in the drawing comprises an apertured conveyor 4, in the form of an endless belt such as a wire netting or a set of parallel wires, mounted on a pair of rollers 14', 14" which are driven by a motor not shown to advance the conveyor in the direction indicated by arrow A, i.e. with its upper run moving from right to left.
  • This upper run traverses an elongated tunnel 3 having an inlet port 5 and an exit port 6 at approximately the same level.
  • a perforated base 15 within tunnel 3, disposed underneath the upper. conveyor run, is spaced from the tunnel bottom to define therewith a manifold for the circulation of a treatment agent of the aforedescribed character, i.e.
  • Conduit l7 communicates by way of respective branches 17a, 17b, 17c with sections 9, 10, 11 of the manifold bounded by base l5, these sections being formed by a pair of valves 21 1,2112, 210 so adjusted that the flow rate through manifold sections 9 and 11 is sharply throttled in comparison with the rate of flow through central section 10. Further flow control maybe achieved with the aid of valves 22a, 22b, 220 in branches 20a, 20b, 200, respectively.
  • two horizontal banks of heat-conductive (metallic) pipes 31, 32 are disposed below and above the conveyor 4, respectively, the two banks being connected in parallel between an inlet duct 33 and an outletduet 34 for a cooling fluid.
  • these pipes are of ellipsoidal cross section with a vertical major axis a and a horizontal minor axis b whose ratio may be approximately 10:1.
  • the mutual separation of the pipes of each bank is seen to be greater at the center of the tunnel than near the edges of the conveyor 4, i.e. in the regions where the turns of the cooled wire 1 overlap so as to constitute accumulations of hot metal.
  • the lower pipes. 3l make contact with the broad bottom portion of pile 2 rising from base 15 whereas the upper pipes 32 traverse only the restricted peak of that pile bounded by steps 12 and 13.
  • the operating temperature of chamber 18 and/or the speed of conveyor 4 may be varied in response to measurements of the temperature of the goods at the exit port 6; the fluid circulating through pipes 31 and 32 may be sub jected to the same type of temperature control.
  • a fluidized bed for the heat treatment of workpieces comprising an elongated tunnel with an inlet port and an outlet port disposed at opposite ends thereof and substantially at the same level;
  • circulation means for blowing a treatment agent upwardly through said base into said tunnel and withdrawing said treatment agent from said tunnel for reconditioning, said treatment agent consisting of a gas stream with entrained solid particles;
  • auxiliary temperature-control means including a bank of horizontally juxtaposed pipes for the circulation of a heat-exchanging fluid, said pipes passing generally horizontally through said tunnel, said base and said conveyor for contact with said particles, said pipes being of oblong cross section with a major vertical dimension.
  • a fluidized bed as defined in claim 1. further including another bank of juxtaposed pipes for said fluid above said conveyor.
  • a fluidized bed for the heat treatment of workpieces comprising an elongated tunnel with an inlet port and an outlet port disposed at opposite ends thereof and substantially at the same level:
  • circulation means for blowing a treatment agent upwardly through said base into said tunnel and withdrawing said treatment agent from said tunnel for reconditioning, said treatment agent consisting of a gas stream with entrained solid particles;
  • auxiliary temperature-control means including a bank of horizontally juxtaposed pipes for the circulation of a heatexchanging fluid, said pipes passing generally horizontally and longitudinally through said tunnel between said conveyor and said base for contact with said particles, said pipes being mutually separated with relatively wide spacing near the center of said conveyor and with relatively narrow spacing near the longitudinal edges of said conveyor.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US710333A 1967-03-04 1968-03-04 Fluidized bed for controlled heat treatment Expired - Lifetime US3550922A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0062030 1967-03-04

Publications (1)

Publication Number Publication Date
US3550922A true US3550922A (en) 1970-12-29

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Family Applications (1)

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US710333A Expired - Lifetime US3550922A (en) 1967-03-04 1968-03-04 Fluidized bed for controlled heat treatment

Country Status (9)

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US (1) US3550922A (en))
AT (1) AT284897B (en))
BE (1) BE711161A (en))
DE (1) DE1602081B1 (en))
FR (1) FR1558013A (en))
GB (1) GB1147129A (en))
LU (1) LU55544A1 (en))
NL (1) NL140291B (en))
SE (1) SE340291B (en))

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718024A (en) * 1971-02-12 1973-02-27 Morgan Construction Co Apparatus including a fluidized bed for cooling steel rod through transformation
US4065251A (en) * 1976-08-03 1977-12-27 Associated Electrical Industries Limited Furnaces
US4170494A (en) * 1976-06-07 1979-10-09 Kobe Steel, Ltd. Surface treatment for metal according to fluidized bed system
US4399984A (en) * 1982-02-08 1983-08-23 Midland-Ross Corporation Automatic installation for the heat treatment of workpieces in fluidized beds
US5156545A (en) * 1989-07-26 1992-10-20 Isover Saint-Gobain Method and apparatus for the treatment and recovery of mineral fiber or glass waste
US5207572A (en) * 1989-07-26 1993-05-04 Isover Saint-Gobain Method and apparatus for the treatment and recovery of mineral fiber or glass waste
WO2013024201A1 (en) * 2011-08-15 2013-02-21 Metso Power Oy Improvement of heat transfer from a fluidized bed to a heat exchanger pipe

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE425799B (sv) * 1980-03-13 1982-11-08 Per Olof Strandell Anordning for nedsvalning av metallemnen
IT1146762B (it) * 1981-03-09 1986-11-19 Danieli Off Mecc Sistema di raffreddamento ausiliario ad aria soffiata per spire di filo metallico formate per laminazione a caldo e dispositivo per attuare tale sistema
US4466479A (en) * 1982-08-19 1984-08-21 Texaco Inc. Method of transferring heat between two fluids and heat exchange tube
BE1004383A3 (nl) * 1989-07-26 1992-11-10 Bekaert Sa Nv Wervelbed voor het afschrikken van staaldraad.
IT1276747B1 (it) * 1995-06-19 1997-11-03 Magaldi Ricerche & Brevetti Estrattore/raffreddatore di materiali sfusi

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD31992A (en)) *
US1295139A (en) * 1915-12-04 1919-02-25 Morgan Construction Co Apparatus for coiling and cooling wire rods.
DE1010483B (de) * 1955-03-29 1957-06-19 Krantz H Fa Vorrichtung zum Kuehlen des in Kuehlbetten laufend vom Walzwerk abgefuehrten Walzgutes

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718024A (en) * 1971-02-12 1973-02-27 Morgan Construction Co Apparatus including a fluidized bed for cooling steel rod through transformation
US4170494A (en) * 1976-06-07 1979-10-09 Kobe Steel, Ltd. Surface treatment for metal according to fluidized bed system
US4065251A (en) * 1976-08-03 1977-12-27 Associated Electrical Industries Limited Furnaces
US4148600A (en) * 1976-08-03 1979-04-10 British Steel Corporation Heat treatment furnace for metal strip
US4399984A (en) * 1982-02-08 1983-08-23 Midland-Ross Corporation Automatic installation for the heat treatment of workpieces in fluidized beds
US5156545A (en) * 1989-07-26 1992-10-20 Isover Saint-Gobain Method and apparatus for the treatment and recovery of mineral fiber or glass waste
US5207572A (en) * 1989-07-26 1993-05-04 Isover Saint-Gobain Method and apparatus for the treatment and recovery of mineral fiber or glass waste
WO2013024201A1 (en) * 2011-08-15 2013-02-21 Metso Power Oy Improvement of heat transfer from a fluidized bed to a heat exchanger pipe

Also Published As

Publication number Publication date
NL6802911A (en)) 1968-09-05
AT284897B (de) 1970-10-12
SE340291B (en)) 1971-11-15
FR1558013A (en)) 1969-02-21
GB1147129A (en) 1969-04-02
DE1602081B1 (de) 1970-05-27
LU55544A1 (en)) 1968-05-03
BE711161A (en)) 1968-07-01
NL140291B (nl) 1973-11-15

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