Combustion – Porous – capillary – particulate or sievelike flame holder,... – Means supplying fuel for passage through the flame holding...
Patent
1994-02-07
1995-12-12
Jones, Larry
Combustion
Porous, capillary, particulate or sievelike flame holder,...
Means supplying fuel for passage through the flame holding...
431328, 431354, 126 92A, F23D 1414
Patent
active
054744431
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a radiant burner for a boiler, consisting of a sheet metal support, with a gas feed line leading to a gas inlet port in the sheet metal support and a curved burner surface of wire cloth arranged at an opposite side of the sheet metal support.
2. Description of the Prior Art
Such radiant burners are known, for example, from U.S. Pat. No. 3,360,028. In that case, the curved burner surface of wire cloth has an elongated, semi-cylindrical shape, which causes the circular gas inlet port to be necessarily very small relative to the burner surface and thereby results in a poor gas distribution, which is not substantially changed by a small slotted diaphragm behind the gas inlet port. Furthermore, such a burner is ill suited for modern compact shapes of combustion chambers or boilers, that is, several such semi-cylindrical burners would have to be arranged parallel and adjacent to each other to come even close to obtaining a substantially uniform radiation of the combustion chamber walls in question. The same more or less applies to the burner according to U.S. Pat. No. 3,291,187.
A similarly poor gas distribution is obtained with a radiant burner according to French patent publication No. 1,361,509, which is substantially spherical and also has a small gas inlet port relative to the size of the burner surface. In addition, the spherical shape causes considerable reflection effects towards the connecting side of the burner.
SUMMARY OF THE INVENTION
Starting with a radiant burner of the indicated type, the object of the invention is to improve such a burner so that it may have a gas inlet port which is as large as possible relative to the size of the burner surface, the burner surface may have as stable a shape as possible, and the gas distribution over the entire burner surface between gas feed port and burner surface may be as uniform as possible.
This object is obtained in a radiant burner of the indicated type with a burner surface of hemispherical shape and at least one similarly hemispherical gas distributor of perforated sheet metal arranged concentrically under the burner surface and spaced therefrom at a distance which is considerably smaller than the diameter of the hemisphere of the burner surface and also affixed to the sheet metal support, the diameter of the gas inlet port corresponding substantially to the diameter of the hemispherical gas distributor.
All requirements with respect to compactness, stability and optimal gas distribution are fulfilled with this construction according to the invention.
BRIEF DESCRIPTION OF THE DRAWING
The embodiments of the present invention and its advantages will be explained in connection with the following description of working examples.
Schematically shown is in
FIG. 1 a section of a specific embodiment of a burner as an integral unit of a boiler closure;
FIG. 2 a section of the "nude" burner with two gas distributors and the metal sheet support;
FIG. 3 a section of a special embodiment of the burner;
FIG. 4 also a section of the burner in atmospheric operation;
FIG. 5 a top view of the burner according to FIG. 4; and
FIG. 6 in section the arrangement of the burner in the combustion chamber of a boiler.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
As conventional, the radiant burner comprises essentially sheet metal support 1, with gas feed line 3 leading to gas inlet port 2 in sheet metal support 1 and curved burner surface 4 of wire cloth arranged at an opposite side of sheet metal support 1.
However, it is essential for such a burner that burner surface 4 have a hemispherical shape and at least one similarly hemispherical gas distributor 5 of perforated sheet metal be arranged concentrically under the burner surface and spaced therefrom at a distance A which is considerably smaller than the diameter D of the hemisphere of burner surface 4 and also affixed to sheet metal support 1, diameter D.sub.1 of gas inlet port 6 corresponding substantially to diameter D.sub.2 of hemispheri
REFERENCES:
patent: 3291187 (1966-12-01), Haeusel
patent: 3360028 (1967-12-01), Saponara et al.
patent: 3684260 (1972-08-01), Solbrig
Hofbauer Peter
Viessmann Hans
Jones Larry
Viessmann Werke Gmbh & Co
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