Combustion – Porous – capillary – particulate or sievelike flame holder,... – Means supplying fuel for passage through the flame holding...
Patent
1994-05-03
1996-11-05
Jones, Larry
Combustion
Porous, capillary, particulate or sievelike flame holder,...
Means supplying fuel for passage through the flame holding...
431329, 126 41R, F23D 1412
Patent
active
055710093
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a gas powered burner, emitting substantially infrared radiation, with perforated ceramic elements which are adjustable in and/or perpendicular to their planes.
Infrared is used nowadays in many different areas. Common weaknesses of existing gas powered constructions are: long as they are horizontally mounted (radiating upwards or downwards). In vertical arrangements, due to the heat rising, the burner is warmer at the top than at the bottom, whereby the infra-red radiation becomes non-uniform. This results in it being impossible to set the desired wavelength on the infra-red emitter. able to adapt the wavelength in the infra-red spectrum to differing areas of application. through-flow speed for the gas increases, the flames try to separate from the burner with the result that the heat emission to the infra-red radiating element reduces. The result is that convection heat increases and the infra-red radiation decreases.
SUMMARY OF THE INVENTION
With the invention, a gas powered burner has been achieved for emitting infra-red radiation. Due to the possibilities of adjustment of the infra-red radiating burner element, the burner is relatively insensitive to placement or position.
The burner element is intended to emit radiation within the infra-red spectrum, containing energy of sufficient intensity for industrial use such as for instance heating up solid or liquid material, drying of organic or inorganic material as well as hardening of, for example, paints or glue in so-called infra-red chambers or the like.
The invention can also advantageously be used for grills for grilling of food products since it can be placed vertically and thereby can give an odor free cooking of the raw products requiring most heat.
The construction of the burner according to the present invention is intended for all types of flammable gas. It is built up from two or more perforated plates or fire proof ceramic material. By displacing the two plates closest to the back part and which lie in contact with each other, symmetrical or asymmetrical hole patterns and hole geometries can be set up. This permits the gases which flow through the plates to be able to be directed in different directions. In addition to this, the construction allows the hole width to be able to be adjusted uniformly or asymmetrically in a continual throttling of the gas supply from one edge to the other. The construction of the burner permits the combustion chambers in and between the perforated ceramic plates, in principal, to be adjusted during operation. This means that the drawbacks, which results in uneven combustion and difficulties to keep all the emitted radiation within the desired wave-length in the infra-red spectrum, which occur when known gas powered infra-red radiators are placed vertically, can be removed via adjustment with this invention.
By placing one or more ceramic plates, perforated with holes, outside and at a suitable distance from the inner plate combination, a combustion chamber is achieved. This combustion chamber can be closed or provided with throttle valves for supply air. Should one use supply air to the chamber, automatic ignition and cut-out should be placed there. The supply air can occur passively or actively by the use of fans. It is mainly this outer plate or plate combination which constitutes the infra-red radiating element in the burner. By using two or more plates it is possible to achieve slanted or curved through-bore geometries. This means that the length of the through-bore which is created increases in relation to perpendicular holes whilst using the same thickness of burner element. This in turn implies that the heat absorbing surface on the infra-red radiating element increase with respect to if it was perforated by holes arranged at right angles. This relationship increases the efficiency.
The clay material included in the ceramic elements can be chosen such that the infra-red wavelength band is emitted at different temperatures. By
REFERENCES:
patent: 2987118 (1961-06-01), Brown
patent: 3198240 (1965-08-01), Keith et al.
patent: 3847536 (1974-11-01), Lepage
patent: 4927355 (1990-05-01), Haire et al.
St.ang.lhane Carl H.
St.ang.lhane-Bjornberg Maria B. E.
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