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EP0469251B1 - Appareil de chauffage avec la combustion catalytique - Google Patents

Appareil de chauffage avec la combustion catalytique Download PDF

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Publication number
EP0469251B1
EP0469251B1 EP91107373A EP91107373A EP0469251B1 EP 0469251 B1 EP0469251 B1 EP 0469251B1 EP 91107373 A EP91107373 A EP 91107373A EP 91107373 A EP91107373 A EP 91107373A EP 0469251 B1 EP0469251 B1 EP 0469251B1
Authority
EP
European Patent Office
Prior art keywords
heating apparatus
infrared
catalytic combustion
apparatus operating
radiation heating
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
EP91107373A
Other languages
German (de)
English (en)
Other versions
EP0469251A1 (fr
Inventor
Bruno Giardullo
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.)
Electrolux Zanussi Elettrodomestici SpA
Original Assignee
Zanussi Elettrodomestici SpA
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 Zanussi Elettrodomestici SpA filed Critical Zanussi Elettrodomestici SpA
Publication of EP0469251A1 publication Critical patent/EP0469251A1/fr
Application granted granted Critical
Publication of EP0469251B1 publication Critical patent/EP0469251B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/18—Radiant burners using catalysis for flameless combustion

Definitions

  • This invention relates to an infrared-radiation heating apparatus which can in particular be used in the various applications in the home owing to its safety, reliability, convenience and low-consumption properties.
  • Cooking surfaces are well-known in household appliance burners with related caps, pan-support ribs and a underlying hob made of stainless steel or enamelled steel sheet. These cooking surfaces usually have serious drawbacks in connection with both safety and cleanability considerations, since their operation is generally associated with a considerable release of carbon and nitrogen oxides into the atmosphere and, furthermore, they are notoriously connected with a substantial risk of their flames extinguishing due to food overflowing from pans placed thereupon, or a number of different causes, with the well-known, very dangerous consequence of toxic and flammable gas escaping unburnt into closed rooms or spaces.
  • a flamless combustion burner which includes an ignition zone, a catalyst zone and a plenum.
  • the catalyst is a thick annular body, and the exhaust gas contacts the surface 24 with different temperatures. Furthermore excess temperatures are reached in the catalyst body 21, and the gas burning is not evenly carried out as the gases are not uniformely expanded.
  • a catalytic combustion process is used also in the apparatus according to this invention.
  • the fuel gas already duly pre-mixed with air to stoichiometric proportions, is introduced in a preferably flat and horizontal expansion pre-chamber 9, from which said fuel gas mixture propagates in a uniform and continuous way, along the desired path, into a diffusion chamber 10, a face of which, preferably the upper one, is defined by the catalyst element 6.
  • Any desired pattern or shape of the combustion surface can be brought about by simply acting on the shape and the size of the diffusion chamber 10 and, therefore, on the flame distributor 5 which forms a wall thereof.
  • the catalyst element 6 the structure of which can be compared with the one of a wire-gauze with a suitably selected mesh-size, is treated with a process of the so-called "WASH COAT" type for the deposition of the catalytic material. It is also preferable for said element 6 to be flat and horizontal and it is of importance that it has a high thermal conductivity in order to ensure a uniform heat distribution.
  • the fuel gas mixture diffuses into said catalyst element 6, which can for example be made in the form of a thin wire-gauze and which shall be brought to its activation temperature in order to initiate the reaction and start the combustion.
  • a variously shaped, electrically fed incandescence-type ignition device 20 which is located near the inlet ports for the air/gas mixture and in contact with the wire-gauze catalyst element 6.
  • the high thermal conductivity of the wire-gauze structure ensures an affective heating of the area involved in the initial activation of the catalytic material.
  • the ignition device is de-energized, or switched off. This whole system provided to ensure ignition (from cold conditions) completes its start-up cycle within a few seconds. If, on the other hand, it is desired to re-ignite the burner within a few minutes from its extinction, the ignition process will take place also without an intervention of the ignition device, since a minimum residual heat of the wire-gauze structure (ie. a temperature of 250 to 300 deg C) will be perfectly sufficient to re-initiate the reaction and, therefore, the combustion process.
  • a minimum residual heat of the wire-gauze structure ie. a temperature of 250 to 300 deg C
  • reaction initiation temperature should be as low as possible.
  • a palladium and/or platinum-based catalyst is preferred.
  • the heat generated and released by the catalyst element 6 is then collected by the inner face of an intercepting surface 8 which encloses said catalyst element 6 that is possibly kept in its position by a holding ring 7.
  • Said intercepting surface 8 conducts heat towards the outside and, therefore, its outer face acts as the actual, final heating element.
  • Said surface 8 further to acting as the intercepting and heat-transmitting element, can be formed to tightly cover and seal the catalyst element 6 and, as a consequence, is adapted to at the same time acts also as a "cover” to retain flue gases and convey into flue exhaust channels that will be provided appropriately.
  • the same surface 8 is closed by having its outer edge fitting against a retaining cap 3 which, through a manifold chamber 16, conveys flue gases into an exhaust fitting 2.
  • the air/gas mixture inlet fitting 1 splits open in such a way as to form the partition 4 which delimitates the expansion pre-chamber 9 on the one side and the flue gas collecting chamber 16 on the other one.
  • the expansion pre-chamber 9 itself can be delimitated, on its other side, by the flame distributor 5, which in turn delimitates, with its opposite face, the diffusion chamber 10.
  • Some parts of said flame distributor 5 can be made to adhere to the catalyst element 6, thereby masking the combustion zones at will and, therefore, achieving any desired combustion pattern.
  • a very particular advantage thereof which anyone skilled in the art would have no difficulty in implementing, resides in the possibility of achieving a heating element having just the desired heat emission properties, in terms of thermal power emitted by said element either in a concentrated form or distributed in specific areas, by simply implementing a plurality of individual diffusion chambers of appropriate shape, size and input rating, as well as arranged according to a corresponding pattern.
  • the flue gases collected by the intercepting surface 8 can be exhausted through appropriately drilled holes or openings 12 along the outer edge of the partition 4.
  • the inlet of the air/gas mixture is governed by a valve which is controlled from the outside.
  • An appropriate Venturi tube can be used to obtain the correct air and gas mixture or, as an alternative solution, a fan can be used in view of overcoming the flow resistance opposed by the catalyst material.
  • the flue gas temperature is intrinsecally relatively low. However, through an appropriate design it can be further reduced and kept at approx. 100 deg C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Incineration Of Waste (AREA)

Claims (9)

  1. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique, comprenant un conduit (1) d'admission du gaz, un activeur amorçant la réaction catalytique, ainsi qu' un ou plusieurs éléments catalytiques (6), caractérisé en ce qu'il comprend aussi une chambre de détente (9) du gaz ét une chambre de diffusion (10), toutes les deux étant délimitées sur au moins un côté par lesdits éléments catalytiques (6), une surface chauffante (8) en face dudit élément catalytique (6) et une calotte (3) pour collecter ou intercepter les produits de la combustion.
  2. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon la revendication 1, caractérisé en ce que ladite surface chauffante (8) est essentiellement plane.
  3. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon les revendications précédentes, caractérisé en ce que ledit élément catalytique (6) est essentiellement plan.
  4. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau catalyseur est formé par rhodium, palladium ou platine déposé sur une surface à haute conductibilité thermique dans une pourcentage se situant entre 0,1 et 0,2 pourcent.
  5. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite chambre de détente (9) et ladite chambre de diffusion (10) sont séparées par un distributeur de flamme (5) présentant une ou plusieurs pluralités (14, 15) d'orifices disposés circulairement et concentriquement pour le passage du gaz.
  6. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon la revendication 5, caractérisé en ce que les zones de combustion dans l'élément catalytique (6) sont obtenues en cachant les autres zones complémentaires en donnant au distributeur de flamme (5) une forme appropriée.
  7. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon l'une quelconque des revendications précédentes, caractérisé en ce que la surface chauffante (8) est fermée hermétiquement par ses bords extérieurs approchés d'une façon étanche contre la calotte (3) y pourvue pour collecter et évacuer les gaz brûlés.
  8. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon la revendication 7, caractérisé en ce que l'écoulement des gaz brûlés vers l'intérieur de ladite calotte (3) se produit à travers des orifices (12) appropriés qui sont pratiqués tout au long de l'extension de la cloison (4) séparant ladite chambre de détente (9) de la chambre d'échappement pourvue pour l'évacuation des gaz brûlés collectés dans l'espace renfermé qui est formé par ladite calotte (3).
  9. Appareil de chauffage par rayonnement infrarouge utilisant la combustion catalytique selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément (20) pourvu en tant qu'activeur pour amorcer la réaction catalytique est formé essentiellement par un circuit à résistance, de préférence du type à spirale ou à bague, placé en contact avec ledit élément catalytique (6).
EP91107373A 1990-05-29 1991-05-07 Appareil de chauffage avec la combustion catalytique Expired - Lifetime EP0469251B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4572990 1990-05-29
IT45729A IT1239151B (it) 1990-05-29 1990-05-29 Dispositivo di riscaldamento utilizzante la combustione catalitica

Publications (2)

Publication Number Publication Date
EP0469251A1 EP0469251A1 (fr) 1992-02-05
EP0469251B1 true EP0469251B1 (fr) 1994-07-20

Family

ID=11257823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107373A Expired - Lifetime EP0469251B1 (fr) 1990-05-29 1991-05-07 Appareil de chauffage avec la combustion catalytique

Country Status (4)

Country Link
EP (1) EP0469251B1 (fr)
DE (1) DE69102952T2 (fr)
ES (1) ES2062609T3 (fr)
IT (1) IT1239151B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7721726B2 (en) 2006-01-03 2010-05-25 Lg Electronics Inc. Gas radiation burner
WO2018095988A1 (fr) * 2016-11-25 2018-05-31 Frima International Ag Système de brûleur pour appareil de cuisson et procédé permettant de faire fonctionner un système de brûleur pour appareil de cuisson

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT211987B (de) * 1956-03-29 1960-11-25 Schweiz Gasapp Fabrik Solothur Heizvorrichtung
US3067811A (en) * 1956-07-02 1962-12-11 Otto Bernz Co Inc Gas burner
US3799142A (en) * 1972-04-26 1974-03-26 F Jensen Method and apparatus for sequestering open flame combustion gas
US4189294A (en) * 1977-10-18 1980-02-19 Comstock & Wescott Inc. Flameless combustion burner and method of operation

Also Published As

Publication number Publication date
EP0469251A1 (fr) 1992-02-05
IT1239151B (it) 1993-09-28
IT9045729A1 (it) 1991-11-29
DE69102952D1 (de) 1994-08-25
DE69102952T2 (de) 1994-12-08
IT9045729A0 (it) 1990-05-29
ES2062609T3 (es) 1994-12-16

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