EP0090745A1 - Brenner für katalytisch wirkende Heizung - Google Patents

Brenner für katalytisch wirkende Heizung Download PDF

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Publication number
EP0090745A1
EP0090745A1 EP83420035A EP83420035A EP0090745A1 EP 0090745 A1 EP0090745 A1 EP 0090745A1 EP 83420035 A EP83420035 A EP 83420035A EP 83420035 A EP83420035 A EP 83420035A EP 0090745 A1 EP0090745 A1 EP 0090745A1
Authority
EP
European Patent Office
Prior art keywords
burner
catalytic
mass
burner according
catalytic mass
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.)
Withdrawn
Application number
EP83420035A
Other languages
English (en)
French (fr)
Inventor
Alain Risse
Alain Lacroix
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.)
Lyonnaise des Applications Catalytiques Ste
Original Assignee
Lyonnaise des Applications Catalytiques Ste
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 Lyonnaise des Applications Catalytiques Ste filed Critical Lyonnaise des Applications Catalytiques Ste
Publication of EP0090745A1 publication Critical patent/EP0090745A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
    • F24C3/06—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame
    • F24C3/062—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame stoves
    • 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

  • the present invention relates to a burner for catalytic heating apparatus.
  • a catalyzed heating appliance essentially comprises a burner allowing the catalytic oxidation at low temperature of a gaseous fuel or one brought into the gaseous state, such as a hydrocarbon.
  • FIG. 1 of the accompanying schematic drawing shows a mobile catalysis heater (2), comprising a housing (3) inside which is mounted, behind a protective grid (4), a burner which is shown in more detail , in exploded perspective, in Figure 2.
  • This burner comprises a heating body (5) consisting of a metal bowl, in the bottom of which is fixed a gas supply system consisting of a coil (6) pierced with orifices .
  • a metal support (7) consisting of a perforated sheet, on which rests a diffusion system (8) consisting of a mattress of mineral fibers.
  • the catalytic mass or active mass (9) generally constituted by refractory mineral fibers or other materials, on which the catalyst is deposited.
  • a metal frame (10) carrying a grid (12) constituted by longitudinal elements and transverse elements keeps the assembly in place.
  • the gas flow rate is considerably increased until reaching a value corresponding to three times the nominal burner flow rate, for a period of time between 30 seconds and 1 minute.
  • This ignition flow is called the choke flow.
  • the gas flow is ignited, usually by a pilot, the flames then disappearing to make way for flameless catalytic combustion.
  • the texture of the diffusing material should be neither too compact nor too light, but perfectly adapted to the texture of the active mass, in order to avoid irregularities in the passage of gas resulting in a poor distribution of the charge in gas in the active mass, and consequently by a significant drop in the yield of the catalytic reaction.
  • obtaining a gas flow rate greater than the nominal burner flow rate requires the use of a specific system and sometimes the creation of a special gas circuit. This leads to an increase in the complexity of the burner valves, which is not favorable from an economic point of view.
  • a gas flow rate higher than the nominal burner flow rate appreciably prolongs the start-up period, since a catalytic burner cannot, even for a short time, properly digest an excess of gas and only strong proportions of unburnt gas are released into the atmosphere.
  • the user is often obliged to completely interrupt the flow of gas for a period of time of the order of 1 minute. This intervention is often felt by the user as an easement characterizing catalytic heaters.
  • the present invention aims to remedy these drawbacks.
  • the burner of the catalyzed heating appliance to which it relates of the type comprising a shaped heating body (13) metal bowl, equipped with a gas supply system (14), in which is mounted a support (15) for the catalytic mass, the active mass or catalytic mass and a retaining frame (17) for the assembly , is characterized in that the properties of the catalytic mass (16) are such that it also fulfills the function of diffusion system.
  • the catalytic mass (16) is mounted without compression inside the burner. Therefore, the frame ensuring its holding consists of a simple peripheral frame without longitudinal or transverse bars.
  • the gas supply system is significantly simplified since it consists of a straight ramp, or a simple nut mounted in the bottom of the bowl forming the heating body.
  • the active mass can rest without compression on a metal support constituted by a perforated sheet (15), or have an integrated reinforcement ensuring its own resistance independently of any external element.
  • the catalytic mass comprises elements such as fibers, beads, son, chips, any agglomerates, etc., of refractory materials, regularly distributed in a mattress of 5 to 15 millimeters thick, having a specific surface at least equal to 1 m 2 / g, having good chemical and mechanical stability in an oxidizing atmosphere up to at least 800 ° C, the elements being arranged so as to provide 40 to 60 vacuum volumes for a full volume .
  • the support of the active mass consists of ceramic fibers, these have a diameter of two to three microns and a density between 2.5 and 3 kg / dm 3 .
  • the elimination of the diffusion mattress allows the entire contact mass to work under optimal oxygenation conditions, which results in particular from the absence of compression on the catalytic mass.
  • the penetration of the combustion air within the contact mass is favored by a judicious choice of the density and the thickness of the catalyst support.
  • the catalytic reaction no longer takes place only on the surface of the contact mass, but also in depth, on the internal face of the contact mass, and propagates over the entire thickness of the mattress.
  • the working temperature is 50 ° C higher than that of the burner described above. This results in a significant increase in the catalytic yield which commonly reaches 99.5%.
  • This improvement in efficiency also makes it possible to lower the level of the idle speed of the burner, which has an advantage for the user as well as an economic advantage.
  • Another advantage of the device according to the invention relates to the ignition and, consequently, the warming up of the contact mass.
  • the suppression of the gas diffusion layer and consequently the greater permeability of the contact mass allows an extremely rapid reaction initiation and a great aptitude for propagation.
  • This gain in catalytic activity is directly linked to the greater ease given to the reactants to mix as soon as they come into contact with the catalytically active substance.
  • the invention brings a great improvement to the existing technique by providing a catalytic heating device from hydrocarbons, such as methane, ethane, butane, propane, heptane, having a simplified structure and excellent performance, suitable for domestic, industrial and agricultural applications.
  • hydrocarbons such as methane, ethane, butane, propane, heptane

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Burners (AREA)
EP83420035A 1982-03-29 1983-03-04 Brenner für katalytisch wirkende Heizung Withdrawn EP0090745A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8205694A FR2524122A1 (fr) 1982-03-29 1982-03-29 Bruleur pour appareil de chauffage a catalyse
FR8205694 1982-03-29

Publications (1)

Publication Number Publication Date
EP0090745A1 true EP0090745A1 (de) 1983-10-05

Family

ID=9272671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83420035A Withdrawn EP0090745A1 (de) 1982-03-29 1983-03-04 Brenner für katalytisch wirkende Heizung

Country Status (7)

Country Link
EP (1) EP0090745A1 (de)
JP (1) JPS58213110A (de)
DK (1) DK93183A (de)
ES (1) ES520543A0 (de)
FR (1) FR2524122A1 (de)
GR (1) GR78801B (de)
PT (1) PT76378B (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1135525A (fr) * 1954-10-19 1957-04-30 élément thermique rayonnant fonctionnant par oxydation catalytique d'un gaz
FR1175570A (fr) * 1957-05-21 1959-03-27 Lyonnaise Des Rechauds Catalyt Perfectionnements aux appareils de chauffage par catalyse
CH414105A (fr) * 1964-03-26 1966-05-31 Calinter Sa Panneau de chauffage catalytique
FR2123888A5 (de) * 1971-02-04 1972-09-15 Ferodo Sa
US3731668A (en) * 1971-05-19 1973-05-08 Impala Ind Inc Catalytic heater
US3857669A (en) * 1971-09-02 1974-12-31 Impala Ind Inc Catalytic heater head
GB1485370A (en) * 1974-12-06 1977-09-08 Atomic Energy Authority Uk Catalysts and catalytic burners

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1135525A (fr) * 1954-10-19 1957-04-30 élément thermique rayonnant fonctionnant par oxydation catalytique d'un gaz
FR1175570A (fr) * 1957-05-21 1959-03-27 Lyonnaise Des Rechauds Catalyt Perfectionnements aux appareils de chauffage par catalyse
CH414105A (fr) * 1964-03-26 1966-05-31 Calinter Sa Panneau de chauffage catalytique
FR2123888A5 (de) * 1971-02-04 1972-09-15 Ferodo Sa
US3731668A (en) * 1971-05-19 1973-05-08 Impala Ind Inc Catalytic heater
US3857669A (en) * 1971-09-02 1974-12-31 Impala Ind Inc Catalytic heater head
GB1485370A (en) * 1974-12-06 1977-09-08 Atomic Energy Authority Uk Catalysts and catalytic burners

Also Published As

Publication number Publication date
ES8401225A1 (es) 1983-12-16
JPS58213110A (ja) 1983-12-12
PT76378A (fr) 1983-04-01
ES520543A0 (es) 1983-12-16
DK93183D0 (da) 1983-02-25
FR2524122A1 (fr) 1983-09-30
GR78801B (de) 1984-10-02
PT76378B (fr) 1985-12-27
DK93183A (da) 1983-09-30
FR2524122B1 (de) 1984-06-29

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Inventor name: RISSE, ALAIN