Combustion – Process of combustion or burner operation – In a porous body or bed – e.g. – surface combustion – etc.
Patent
1990-02-08
1992-04-14
Yeung, James C.
Combustion
Process of combustion or burner operation
In a porous body or bed, e.g., surface combustion, etc.
431328, 126 92AC, 2989002, F23D 340
Patent
active
051043092
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to a radiant burner as described in the preamble of claim 1 and to a process for producing a burner head and an incandescent mantle for such a radiant burner.
PRIOR ART
Radiant burners with ceramic burner heads have been known for a very long time. The susceptibility of the ceramic body to cracking is a serious problem in burners of this type. This has an unfavorable effect on the life of the burner and necessitates expensive and time-consuming repair and installation work. The lost operating time of a system that uses these burners is another important consideration. Even small cracks in the incandescent mantle can lead to significant problems in the operation of the burner, because they are undesired passages for the operating medium, which can cause back-ignition and other problems.
BRIEF DESCRIPTION OF THE INVENTION
The goal of the invention is to eliminate as far as possible the previously observed problems and disadvantages and to create a radiant burner with a burner head made of ceramic or comparable material. This burner must have favorable characteristics, including especially resistance to cracks in the ceramic body, to eliminate the problems of back-ignition and short service life. The invention also intends to provide a more favorable design for a radiant burner. The invention also deals with other, related problems that are described in detail below.
In a radiant burner of this type, the invention proposes that the incandescent body be provided with a metal lining on its inside or rear side, i.e., the side facing the housing. The metal lining extends partially into the burner channels in regions called intake sections and is sealed except for the burner channel intakes formed in this way.
This means that the rear side of the incandescent body has an impenetrable seal that extends into the burner channels. Even if cracks or fractures develop in the incandescent body in the course of time, they cannot have a harmful effect on the operating behavior of the burner, because the path for any fuel-air mixture entering such cracks is blocked by the lining to the rear, including the intake regions to the channels. The problems that can arise in conventional burners due to cracks and the like in the incandescent body are rendered harmless here. Therefore, even if cracks should develop, the burner can continue operating, which means that expensive repairs are avoided, and the service life of the burner is increased. The prevention of back-ignition that is achieved does not depend on the particular load on the burner. In other words, it is also possible to operate the burner at greatly reduced capacity, as is often desired, at least temporarily.
The lining can be made of a variety of metals, depending on the intended purpose of the burner and the requirements that it must satisfy. Examples of suitable metals are iron and especially heat-resistant steel.
In many cases it is sufficient for the intake sections of the lining to surround only the edge areas at the ends of the channels. In other cases, it may be advantageous for the intake regions to extend farther into the burner channels, especially about halfway along the length of the channels or even farther.
In one effective design, the intake sections and the rest of the lining consist of a single piece. This type of piece can be produced especially by the shaping (e.g., pressing, punching, piercing, or a combination of such operations) of a platelike workpiece provided as the lining, especially a piece of sheet metal.
It is also possible, however, to produce the intake sections as parts that are separate from the flat lining and to join them to the lining during the construction of the burner head. The two parts can be joined permanently or detachably, either by a positive interlocking connection of the parts or by a friction-locking connection, e.g., a force fit.
The lining can rest directly against the incandescent body. Depending on the requirements, however, it is also possible to provide an
REFERENCES:
patent: 3445175 (1969-05-01), Krieger
patent: 3529916 (1970-09-01), Krieger
patent: 3661499 (1972-05-01), Krieger
patent: 3885907 (1975-05-01), Teague, Jr.
Weinstein Louis
Yeung James C.
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