Combustion – Pot type burner – Having means for continuously feeding fuel
Patent
1986-02-25
1987-06-23
Dority, Jr., Carroll B.
Combustion
Pot type burner
Having means for continuously feeding fuel
431339, F23D 502
Patent
active
046749748
DESCRIPTION:
BRIEF SUMMARY
This invention relates to improvements in liquid-fuel pot burners.
Liquid-fuel pot burners, for example as shown in U.S. Pat. No. 4,466,790, usually include a row of holes at the outlet for the combustion gases to cause secondary air to flow radially towards the central axis of the combustion space for the final combustion of the fuel after evaporation thereof in the combustion space, on its way out of the burner.
Also, in previous liquid-fuel pot burners, the cover wall is placed at a substantial distance from the outlet and it is not possible to keep evaporated fuel from making its way through the outlet at the center thereof. It is difficult for the secondary air to reach this fuel so that unburned or incompletely burned fuel (CO=carbon monoxide) will be discharged from the burner, this naturally being undesired.
The object of the present invention is to design a burner in which the fuel is combusted as completely as possible.
This object is attained by the burner according to the invention with the characterizing features recited in the claims hereof.
It is a preferred characteristic of the present invention that the passage in which the secondary air impinges on the fuel becomes narrower, thus promoting the mixing of the fuel and the air and for this reason a more complete combustion. A further preferred characteristic is that the secondary air impinge on the surface forming the transition between the first and the second parts of the cover wall, producing turbulence in the entire annular outlet for fuel, such annular outlet being formed between the said transition and the edge of the circular outlet from the combustion space. The fuel has to pass through such turbulence and is there very effectively mixed with the secondary air, this again tending to promote complete combustion.
A preferred characteristic of the transition of my improved pot burner is to cause turbulence in the form of a ring which revolves about the center of its circular axis. The fuel, which is constrained to pass through this revolving ring, is very effectively mixed and burns consuming the secondary air in the ring.
The fuel that is evaporated in operation tends to rise upwards to a position under the cover wall, where it is deflected radially outwards. This impairs the mixing of the fuel with the primary air supplied through the openings that are spaced out along the height of the wall in the combustion space. It is also a preferred characteristic that the exit flow of fuel is distributed by the insert over the height thereof because of the collar on the ring. The primary air, which flows towards this collar, gives rise to turbulence between this ring and the second part of the cover wall. Such turbulence, that promotes the mixing of the fuel with the air, forms an obstacle for the fuel, which is attempting to make its way between the ring and the second part so that more fuel will tend to move out of the insert under the ring. I also preferably provide a plurality of cages to impart heat by radiation to the fuel, which flows through the insert, and may serve to produce a further improvement of the combustion.
The floor of the combustion space has to be maintained at a certain temperature to ensure that there is no undesired effect on the evaporation and combustion of the fuel in the combustion space. The outer side of the floor is thus preferably protected by a shield to keep the relatively cold combustion air from directly impinging on the floor and cooling it.
An embodiment will now be given of a burner in keeping with the invention on the basis of the attached drawing, in which:
FIG. 1 is a longitudinal section through a burner with a cage insert in the combustion space, such insert being partly sectioned and partly shown in elevation,
FIG. 2 is a section taken on the line II--II of FIG. 1, and
FIG. 3 is a view of a further possible form of the insert.
Turning to FIG. 1, 10 denotes a combustion space, which is enclosed by a circularly cylindrical wall 12, a floor 14 and an upper ring 16, which ring 16 has a circularly cylin
REFERENCES:
patent: 2513551 (1950-07-01), Custance
patent: 2700418 (1955-01-01), Gilmore
patent: 4466790 (1984-08-01), Godijn
Dority Jr. Carroll B.
Electrolux S.A.R.L.
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