Gas burner

Details Gas burner Gas burner

1993-10-06

1997-07-22

Price, Carl D.

Combustion

Mixer and flame holder

126 39E, 2395535, F23D 1462

Patent

active

056498225

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention is directed to a gas burner, particularly an atmospheric gas burner with premixing of primary air, with a burner ring having gas outlet ducts, and with a burner cover which may be constructed so as to form one piece with the latter.
2. Description of the Prior Art
Various constructions of gas burners for hearths are known. The known burners have flame outlet openings which are formed as slots, grooves or bore holes which are generally directed outwardly in a radial direction proceeding from an imaginary center point of the burner.
In the course of attempts to improve the efficiency of such burners and in particular also their environmental acceptability, i.e. to reduce emissions of noxious substances, burner constructions have been developed which diverge from the conventional types. Such burner designs are shown, for example, in DE-37 09 445-A1.
The object of the invention is to provide a solution by which, in particular, the NO.sub.x content as well as the CO content in the exhaust gas in atmospheric burners is significantly reduced, specifically over a large regulating range between low and high settings of the burner.


SUMMARY OF THE INVENTION

This object is met, according to the invention, in that the center axis of the gas outlet ducts lies at an angle diverging from 0.degree. relative to a radius associated with the respective outlet opening.
The oblique position of the gas outlet ducts relative to an imaginary associated radius results in a significant whirling effect. After exiting the outlet ducts designed according to the invention, the gas/air mixture is whirled in a helical or spiraling manner resulting in optimal burn-up. The CO and NO.sub.x are accordingly reduced.
An additional advantage consists in that the flames cannot proceed along the shortest path from the flame outlet opening to the edge of the pot when the latter is put in place, but rather are compelled to remain for a longer period of time beneath the base of the pot, resulting in a kind of spiral stream beneath the pot base. Consequently, the flame energy can be exploited in a distinctly improved manner, i.e. in order to achieve uniform cooking output, the burner can either operate for a shorter period of time on the whole or can be operated at a lower setting so that the amount of noxious substances loading the environment is necessarily reduced in its entirety.
Further advisable constructions of the invention follow from the subclaims.
It is advisable, for example, that the gas outlet angle relative to the associated radii be adjusted between 15.degree. and 90.degree., where a 90-degree angle results in a practically tangential outflow. The slots can be constructed as bore holes and can be straight or curved in their axial direction as well as in their cross-sectional shape. V-shaped cross sections can be provided as well as ducts of different dimensions which are arranged parallel next to one another, which leads to an optimal regulation between partial and full load. Additional outlet openings can also be provided for forming auxiliary flames in a manner known per se.
To facilitate adaptation of the flow conditions within the burner to specific applications, it may be advantageous to provide the burner cover with a flow guiding cone and/or with whirling/cooling ribs.
It has been shown that special adaptation between the outer contour of the burner cover and the outer contour of the burner ring relative to the outlet edges of the gas outlets also results in different burning behavior, for which the invention provides special designs, depending on the intended use, as indicated in the subclaims.
The flow ducts in the interior of the burner can also be designed in different ways according to the invention, either with or without flow cones.
Finally, it may be advantageous to provide for additional outlet openings in the adaptor mount through which secondary air can be sucked in from the trough space below the burner for flame cooling, as is likewise provided

REFERENCES:
patent: 873182 (1907-12-01), Springer et al.
patent: 3211208 (1965-10-01), Borwick
patent: 3817689 (1974-06-01), Capy
patent: 3874841 (1975-04-01), Feclin
patent: 3905756 (1975-09-01), Ferlin et al.
patent: 4168950 (1979-09-01), Seemann et al.
patent: 4886043 (1989-12-01), Homer

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