US3656719A - Method of heating metallurgical products - Google Patents

Method of heating metallurgical products Download PDF

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Publication number
US3656719A
US3656719A US64261A US3656719DA US3656719A US 3656719 A US3656719 A US 3656719A US 64261 A US64261 A US 64261A US 3656719D A US3656719D A US 3656719DA US 3656719 A US3656719 A US 3656719A
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US
United States
Prior art keywords
products
hearth
kiln
heating
movements
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
US64261A
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English (en)
Inventor
Pierre Marie Louis Dessarts
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.)
Heurtey SA
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Heurtey SA
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Filing date
Publication date
Application filed by Heurtey SA filed Critical Heurtey SA
Application granted granted Critical
Publication of US3656719A publication Critical patent/US3656719A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
    • F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path walking beam furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path

Definitions

  • the invention relates to a heating method and means for imparting to mutually spaced products resting on the hearth of a kiln of this kind successive individual advancing motions, each consisting of alternating elemental motions, of which one at least is of length different from that of the others.
  • the advantage of the invention resides primarily in the recovery of the heat accumulated in the hearth on the uncovered parts thereof and its transmission along successive zones to the undersurfaces of the products being treated, with dwelling times in the kiln and a degree of filling thereof enabling maximum efficiency to be obtained.
  • the present invention has for its object to overcome these disadvantages by providing a method of heating, in a furnace or a kiln, such products as metallurgical products, in ac cordance with which method different mutually spaced products, in a tunnel kiln imparting successive motions of advance thereto, have imparted to them alternating elemental motions the amplitudes of which are substantially equal to different multiples of the spacing between the products, at least one of the phases of motion having an amplitude greater than that of the others.
  • the motion will be composed of a first movement equal to said spacing, of a second movement of identical extent in the opposite direction, and of a third movement in the same direction as the first movement but equal to twice the amplitude thereof, whereby areas on the undersurface of each slab, of width equal to said mutual spacing, are fetched successively into contact with hearth areas of corresponding width that have been previously exposed to the arch heat, the whole being accomplished in three phases or elemental movements for each unit forward advance.
  • a hearth material which is at once an accumulator and good conductorof heat, whereby to offer a heat transfer coefficient favourable to rapid acquisition and returning of the accumulated heat.
  • a hearth of this kind may comprise not only the accumulating layer but also a subjacent insulating layer.
  • the elemental movements and ultimately the unit forward advances can be obtained by any convenient electric control means or unit providing mechanical motions by means of combinations of earns, a Geneva mechanism, and like arrangements.
  • the surface of the hearth is constantly maintained at temperature levels close to that reached by the metal being treated, thus ensuring satisfactory behaviour of the hearth with time and thereby accordingly providing a system having in-built protection against possible meltings of the oxides entering into the composition of the hearth material. In this way it is possible to operate at higher heat-emission temperatures.
  • the health surface temperature remains lower than what it would be if no such absorption took place and consequently lies below the permissible limit.
  • FIGS. 1 to 4 are highly schematic portrayals of the different locations of metallurgical products on a kiln hearth in the course of a unit cycle of advance of all the products.
  • a kiln hearth 1 formed of an upper heat accumulating and conducting layer 2 and a lower insulating layer 3, are placed, at regular intervals shown by one of the dimensions 4, identical products 5 having a width represented by the dimension 6.
  • the hearth areas 7 between the products 5 receive from the kiln arch a radiation represented'by an arrow 8, and the upper surfaces of the product 5 receive the same radiation indicated by an arrow 9.
  • the third elemental movement is finally imparted to the product with an amplitude twice the value of the previous elemental movements, but in the downstream direction.
  • product 5a exposes a middle portion to the hearth area 7d which had remained uncovered during the previous phase of dwell.
  • the upper layer 2 could be fonned of bricks or a chromium bearing refractory cement, while the bottom layer could be made of any conventional insulating material.
  • the thickness of the treated product is equal to about one-third of its width, which explains why the elemental movements are respectively equal to one-third of the width of the product in the case of the first two movements, and to two-thirds thereof in the case of the third movement.
  • other fractional values could be adopted, such values being preferably chosen so as to achieve a juxtaposition, beneath the undersurface of the products, of the contact areas with the previously uncovered counterpart areas on the hearth, whereby to obtain a uniform heating by heat recovery.
  • the method hereinbefore described allows of reducing the dwelling time in the kiln and recovering maximum heat from the hearth with optimum efliciency (short dwelling times between consecutive elemental movements composing the cycle of forward travel), while at the same time providing the necessary dwelling times for the products in the kiln through the adoption of elemental movements in altemating directions and an acceptable charging percentage in relation to the hearth area.
  • the rate of output of the products herein considered, from the kiln reaches its maximum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
US64261A 1969-08-19 1970-08-17 Method of heating metallurgical products Expired - Lifetime US3656719A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6928327A FR2056012A5 (fr) 1969-08-19 1969-08-19

Publications (1)

Publication Number Publication Date
US3656719A true US3656719A (en) 1972-04-18

Family

ID=9039157

Family Applications (1)

Application Number Title Priority Date Filing Date
US64261A Expired - Lifetime US3656719A (en) 1969-08-19 1970-08-17 Method of heating metallurgical products

Country Status (9)

Country Link
US (1) US3656719A (fr)
JP (1) JPS512047B1 (fr)
BE (1) BE754524A (fr)
ES (1) ES382872A1 (fr)
FR (1) FR2056012A5 (fr)
GB (1) GB1311298A (fr)
LU (1) LU61525A1 (fr)
NL (1) NL161575C (fr)
ZA (1) ZA705523B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2809189C2 (de) * 1977-06-13 1982-12-23 Voest-Alpine AG, 1011 Wien Hubbalkenförderer für einen Glühofen
TWI553327B (zh) * 2014-05-14 2016-10-11 財團法人國家實驗研究院 地震偵測系統及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR762353A (fr) * 1933-01-12 1934-04-10 Ofag Procédé de transport des produits dans les fours continus de recuit et de traitement thermique
US2583968A (en) * 1948-07-28 1952-01-29 Ajax Electric Company Inc Pusher mechanism
US3398939A (en) * 1966-08-26 1968-08-27 Sunbeam Corp Shuttle hearth furnaces
US3556492A (en) * 1968-11-01 1971-01-19 Nippon Steel Corp Method and apparatus for charging steel slabs into reheating furnace
US3567197A (en) * 1968-04-09 1971-03-02 Koppers Wistra Ofenbau Gmbh Metallurgical furnace and method of transporting commodities therein

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR762353A (fr) * 1933-01-12 1934-04-10 Ofag Procédé de transport des produits dans les fours continus de recuit et de traitement thermique
US2583968A (en) * 1948-07-28 1952-01-29 Ajax Electric Company Inc Pusher mechanism
US3398939A (en) * 1966-08-26 1968-08-27 Sunbeam Corp Shuttle hearth furnaces
US3567197A (en) * 1968-04-09 1971-03-02 Koppers Wistra Ofenbau Gmbh Metallurgical furnace and method of transporting commodities therein
US3556492A (en) * 1968-11-01 1971-01-19 Nippon Steel Corp Method and apparatus for charging steel slabs into reheating furnace

Also Published As

Publication number Publication date
NL161575C (nl) 1980-02-15
DE2040729B2 (de) 1976-10-21
NL7012293A (fr) 1971-02-23
DE2040729A1 (de) 1971-03-04
LU61525A1 (fr) 1970-10-22
JPS512047B1 (fr) 1976-01-22
BE754524A (fr) 1971-01-18
NL161575B (nl) 1979-09-17
FR2056012A5 (fr) 1971-05-14
GB1311298A (en) 1973-03-28
ES382872A1 (es) 1972-12-16
ZA705523B (en) 1971-04-28

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