Combustion – Burner having electrical heater or igniter – Adjacent exposed liquid fuel surface on fuel support
Patent
1997-04-30
2000-02-22
Lazarus, Ira S.
Combustion
Burner having electrical heater or igniter
Adjacent exposed liquid fuel surface on fuel support
431263, 431326, 431335, 431350, 126116R, F23Q 300, F23D 1144, F24H 300
Patent
active
060273348
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a vaporizing burner with combustion chamber for a heater or for the thermal regeneration of an exhaust gas particle filter, with a circumferential limiting wall, which has a lateral outer socket for accommodating an igniting means, with a front limiting wall, which has a central opening, with an air feed pipe, which extends coaxially into the combustion chamber and has radial air outlets through the wall of the pipe, and with a fuel feed means.
BACKGROUND OF THE INVENTION
Prior-art vaporizing burners have combustion chambers which operate based on the principle that the fuel is applied to a wall or is introduced into a porous material and is evaporated from there and burned. The evaporation, reaction and combustion take place in one space, i.e., they are not separated. The combustion air is either fed directly to the combustion chamber or it is fed in distributed in the entire combustion chamber or radially via holes (over the outer jacket) or via a central air pipe, which is provided with holes and has a flame tube at a certain distance from the outlet of the pipe. The common feature of these combustion chambers is that they have a relatively low output density, i.e., a relatively low outgoing output relative to the volume of the combustion chamber.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention is to provide a vaporizing burner of the type described in the introduction, which can be used in many fields, makes possible an efficient combustion that is different from the combustion according to the above-mentioned prior art, and which especially has a simple and compact design and can be efficiently manufactured and assembled.
According to the invention, a vaporizing burner is provided with a combustion chamber for a heater or for the thermal regeneration of an exhaust gas particle filter. The burner includes a circumferential limiting wall which has a lateral outer socket for accommodating an igniting means. The front limiting wall has a central opening, with an air feed pipe, which extends coaxially into said combustion chamber and has radial air outlets through the pipe wall, and with a fuel feed means. A guide means is provided for feeding in a swirling flow. The guide means is associated with the air feed pipe of the combustion chamber.
Provisions are made, in particular, for associating a guide means with the air feed pipe, and especially for arranging it in front of the said air feed pipe, wherein the said guide means ensures that the combustion air is fed in a swirling flow to the (cylindrical) air feed pipe during the operation of the burner. The swirling flow is a two-dimensional flow, whose principal component extends in the area of the air feed pipe located near the wall, wherein the radial component of the flow is relatively weak, and the axial component of the flow is relatively strong. The radial air outlets through the wall of the pipe ensure that the high tangential velocity component will be deflected and accelerated, wherein the "swirl" is essentially destroyed or a positive or negative residual swirl is established. This leads to an especially good "loading" of the annular space with air, and it increases the efficiency of the combustion. The radial air outlets may be designed as longitudinal slots open at their ends or as closed passage windows in the wall of the pipe and distributed over the circumference of the wall of the pipe, optionally arranged in an oblique position and/or with bent edges in order to establish the above-mentioned (positive or negative) residual swirl.
Provisions are preferably made for designing the guide means for the swirling flow to be established in the form of guide blades, which may be designed, in particular, integrally or in one piece with the air feed pipe, wherein the pipe and the guide blades are made as, e.g., a single cast part.
In a preferred variant of the present invention, a coaxial flame tube, which stabilizes the flame during the operation and is used as a
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J. Eberspacher GmbH & Co.
Lazarus Ira S.
Lee David
LandOfFree
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