EP0210115B1 - Dispositif de chauffage de soles de fours industriels pour traitement de solides - Google Patents

Dispositif de chauffage de soles de fours industriels pour traitement de solides Download PDF

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Publication number
EP0210115B1
EP0210115B1 EP86420200A EP86420200A EP0210115B1 EP 0210115 B1 EP0210115 B1 EP 0210115B1 EP 86420200 A EP86420200 A EP 86420200A EP 86420200 A EP86420200 A EP 86420200A EP 0210115 B1 EP0210115 B1 EP 0210115B1
Authority
EP
European Patent Office
Prior art keywords
resistors
heating
furnace
plate
hearth
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
Application number
EP86420200A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0210115A1 (fr
Inventor
Georges Rutten
François de Richaud
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.)
Comurhex pour La Conversion de lUranium en Metal et Hexafluorure SA
Original Assignee
Comurhex pour La Conversion de lUranium en Metal et Hexafluorure SA
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 Comurhex pour La Conversion de lUranium en Metal et Hexafluorure SA filed Critical Comurhex pour La Conversion de lUranium en Metal et Hexafluorure SA
Publication of EP0210115A1 publication Critical patent/EP0210115A1/fr
Application granted granted Critical
Publication of EP0210115B1 publication Critical patent/EP0210115B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
    • F27B9/063—Resistor heating, e.g. with resistors also emitting IR rays

Definitions

  • the present invention relates to a device for heating the floors of industrial ovens by electrical resistances.
  • the term sole refers to both the fixed hearths of different types of ovens, such as chamber ovens, tunnel ovens ... as well as the heating plates of tray ovens.
  • Tray ovens are usually heated either by hot gases introduced directly into the oven enclosure, or by heat transfer fluids water, steam, organic liquids or molten salts, circulating inside the trays; these fluids being chosen as a function of the temperature to be obtained.
  • the present invention aims to eliminate the drawbacks due to the use of hot gases and heat transfer fluids; in particular in the case of organic fluids, it will be possible to overcome their limit temperature for use (approximately 350 ° C.), without having recourse to the use of molten salts.
  • the invention using electrical energy, has the advantages linked to its use: cleanliness, safety, flexibility of use, ease of implementation and regulation, improvement of yields, temperature reached limited only by quality. electrical resistors used. It also does not have the disadvantages such as the use of refractories, and allows to obtain lighter installations, therefore less expensive and having less thermal inertia.
  • the invention is a device for heating a metal hearth of an industrial oven by integrated electrical resistors of armored type, arranged below said hearth and without contact with it, characterized in that said resistors are placed on the upper face of a sheet. of refractory metal forming a reflector, the other side of which is coated with a layer of insulating material, the whole being placed on a support plate.
  • the heating device is integrated into the floor of the industrial oven.
  • the sole is itself made of a resistant and heat conductive material, preferably it is a steel plate on which the solid product to be treated circulates.
  • the resistors are placed on a shiny sheet of refractory metal forming a reflector, the other side of which is coated with an insulating material, the whole being placed on a support plate.
  • This arrangement mainly using radiant heating, leads to a homogeneous distribution of the temperature and to avoid hot spots; it is helped in this by the presence of a diffuser formed by the sole itself.
  • the absence of a refractory promotes rigorous control of the temperature rise profiles and reduces thermal inertia.
  • the support plate and the sole can be made integral by a peripheral expansion strip fixed to these two parts. It is possible to keep the assembly more rigid either by spacers between the support plate and the bottom, or by appropriately arranged extra thicknesses.
  • the resistors are confined in a completely closed and sealed casing, which has the advantage of isolating them from pollution and / or corrosion due to the atmosphere of the furnace or other treated products.
  • a balancing tube can connect the interior of this housing to the atmosphere of the oven either directly, or through filters or traps, or even by being connected to the pressure supply lines.
  • the resistors can be arranged according to a density in relation to the surface power, uniform or not, which is needed for the product to be treated.
  • the resistors can be arranged in several heating zones, each of which has its own electrical supply and temperature regulation; this makes it possible to produce all kinds of predetermined temperature profiles, therefore to conduct the reactions very rigorously and also to compensate for the effects of the expansion which would deform the sole.
  • FIG. 1 represents a hearth heated by the device according to the invention.
  • tray ovens comprising, as a heating means, heating trays according to the invention is particularly advantageous.
  • the oven which can operate in a controlled atmosphere, consists of a conventional sealed enclosure in the shape of a bell inside which the trays are superimposed and sufficiently spaced from each other to allow the product to be treated to circulate from the 'one to the next.
  • Each of the plates with a diameter of about 1.7 m has a total thickness of 5 cm, the sole and the support plate have the same thickness and the distance separating the sole from the resistors is approximately 2 cm.
  • the armored type electrical resistors are arranged in 3 concentric heating zones.
  • Three concentric spacers are firstly welded to the support plate and secondly fixed to the bottom by a bayonet device.
  • An expansion strap connects the sole and the support plate by their periphery.
  • a pressure equalization tube opens into the interior of the housing thus formed.
  • the deformations of the plates were measured to ensure that they correspond to the specifications necessary for the construction of the oven: the maximum admissible deformation of the hearth between ambient temperature and maximum temperature in use, is measured relative to a reference plane and must be less than 10 mm.
  • this oven was used to decompose uranyl nitrate hexahydrate in two stages (dehydration and denitration) and under reduced pressure; the final product obtained (uranium trioxide) must meet specific physical characteristics linked in part to residual water and nitrogen and dependent on the thermal regimes undergone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)
EP86420200A 1985-07-24 1986-07-21 Dispositif de chauffage de soles de fours industriels pour traitement de solides Expired EP0210115B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8511745 1985-07-24
FR8511745A FR2585461B1 (fr) 1985-07-24 1985-07-24 Dispositif de chauffage de soles de fours industriels pour traitement de solides

Publications (2)

Publication Number Publication Date
EP0210115A1 EP0210115A1 (fr) 1987-01-28
EP0210115B1 true EP0210115B1 (fr) 1989-03-08

Family

ID=9321840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86420200A Expired EP0210115B1 (fr) 1985-07-24 1986-07-21 Dispositif de chauffage de soles de fours industriels pour traitement de solides

Country Status (6)

Country Link
EP (1) EP0210115B1 (enExample)
JP (1) JPS6317386A (enExample)
BR (1) BR8603464A (enExample)
DE (1) DE3662310D1 (enExample)
FR (1) FR2585461B1 (enExample)
ZA (1) ZA865481B (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937104B4 (de) * 1989-11-07 2004-02-19 EISENMANN Maschinenbau KG (Komplementär: Eisenmann-Stiftung) Verfahren zum Trocknen von Feuchtigkeit aufweisenden Keramikteilen und Sintern derselben

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR418693A (fr) * 1909-05-13 1910-12-15 Imbert Process Company Perfectionnements aux fours électriques
US1671794A (en) * 1926-06-05 1928-05-29 David L Summey Resistor and support therefor
GB528857A (en) * 1939-05-06 1940-11-08 Frank Bernhard Dehn Improvements in electric furnaces

Also Published As

Publication number Publication date
BR8603464A (pt) 1987-03-04
JPS6365877B2 (enExample) 1988-12-19
EP0210115A1 (fr) 1987-01-28
FR2585461A1 (fr) 1987-01-30
ZA865481B (en) 1987-08-26
FR2585461B1 (fr) 1989-05-19
DE3662310D1 (en) 1989-04-13
JPS6317386A (ja) 1988-01-25

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