Catalytic burner

Details Catalytic burner Catalytic burner

1998-07-14

1999-07-13

Dority, Carroll B.

Combustion

Porous, capillary, particulate or sievelike flame holder,...

Means supplying fuel for passage through the flame holding...

126 91R, 126 91A, F23D 1412

Patent

active

059217693

DESCRIPTION:

BRIEF SUMMARY
The present invention relates in a general way to heating devices employing catalytic combustion of gas, especially petroleum gases such as butane and propane, as well as to the appliances which incorporate such devices, especially heating appliances and domestic cooking appliances.
By way of domestic heating and cooking appliances may be mentioned for example ovens, deep-fat fryers, hotplates or griddles.
Devices for heating by catalytic combustion, such as radiating-surface catalytic burners, have been known for some time.
They are used for domestic purposes, such as auxiliary heating, or industrial purposes, such as drying.
As a general rule they involve atmospheric combustion at the surface of a catalytic support; the combustible gas is fed to the surface through the support, the catalytic combustion taking place in the open air as the combustible mixture emerges at the surface of the support.
The German document DE-A-1 401 162 describes a heating device using atmospheric catalytic combustion, comprising fibrous matter which is resistant to high temperatures, forming a coherent layered structure, this fibrous matter being impregnated with a substance having thermocatalytic activity.
Such a device includes means for creating a circulation of a combustible gas/combustive gas mixture through the said structure of fibrous matter impregnated with the catalytic substance in a direction substantially perpendicular to the plane of the said structure so that catalytic combustion occurs at the external surface thereof.
Furthermore, heating devices employing catalytic combustion are known in which the catalytic combustion of a combustible gas/combustive gas mixture occurs in a confined enclosure, from one end to the other of a circulation path devised inside a heating body.
The aforesaid German document DE-A-1 401 162 also describes a heating device employing catalytic combustion of gas of this type, which comprises a flat combustion enclosure delimited by two parallel plane walls. A catalytic lining taking the form of a layer of fibres impregnated with a catalytic substance is arranged inside the combustion enclosure parallel to the said plates. The lining delimits on one side a gas intake chamber and on the other side a burnt gas exhaust chamber. A gas circulation circuit is devised between an inlet for the gaseous mixture in the said gas intake chamber, and an outlet provided in the exhaust chamber.
The gas then circulates by passing through the layer-form catalytic structure in a direction perpendicular to the said structure, the heat liberated by the catalytic combustion being transmitted by convection and conduction to the plane walls defining the combustion enclosure and constituting heater plates.
Similarly, the document EP-0 380 705 describes a heating device using confined catalytic combustion which comprises, inside a heater body, a system for lighting a combustible gas/combustive gas mixture, which makes it possible to inject the said gas for combustion through a catalytic exchange surface. The catalytic exchange surface is arranged parallel to the external walls of the heater body some distance from them. Heating is effected by transmitting the heat of combustion liberated to one of the said walls constituting a heater plate.
The document U.S. Pat. No. 4,927,353 describes a heating device using catalytic combustion of great complexity, which furthermore includes, a catalytic combustion enclosure supplied with a gas mixture for combustion. This catalytic combustion enclosure takes the form of a hollow tube inside which is arranged a catalytic lining which defines on either side two combustion chambers, the gas passing through this lining producing the catalytic combustion which is transmitted via a gas outlet to heater plates.
The document U.S. Pat. No. 4,836,117 describes a heating system using catalytic combustion which takes the form of concentric cylinders inside which is devised a circulation of gas passing through a catalytic lining arranged in an interior bulb, the catalytic combustion enabling

REFERENCES:
patent: 3801212 (1974-04-01), Cutler
patent: 4189294 (1980-02-01), Rice et al.
patent: 4375949 (1983-03-01), Salooja
patent: 4927353 (1990-05-01), Nomura et al.

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