DE8809873U1 - Injector gas burner - Google Patents

Description

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Joh. VaH lant GmbH u. Co, GM 679

2 8 July/ 1988

Injector gas burner

The invention relates to an injector gas burner with at least one burner rod, which is fed with a gas-air mixture via at least one gas nozzle and a mixing tube associated therewith, wherein the wall of the burner rod has mixture outlet openings on its upper side and in the flame area above the mixture outlet openings the combustion chamber is divided and structured by built-in components.

Such an injector gas burner is known from AT-PS 92 336. Here, glow bodies designed as heating plates are inserted between the individual burner chambers, which have the mixture outlet openings.

From AT-PS 80 257, incandescent bodies which serve to increase the heating effect and which have a plate-like shape are also known.

AT-PS 75 359 also describes plate-type incandescent elements used to increase the heating effect of gas heaters.

Insert bodies are also known from GB-PS 416 802 to close off the combustion chamber at the bottom.

DE-PS 2! 119 831 shows a gas burner with a central separating body 1, which is surrounded by a nozzle ring. The separating body has steps on which vortices form.

Finally, a radiant gas burner has become known from US-PS 3 881 858, which has a ceramic multi-chamber structure.

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The present invention is based on the object of minimizing the pollutant emissions that occur in an injector gas burner according to the generic term, in particular the ;;

NO _x emissions.

As is known, this formation of ΔΩ is primarily caused by high flame temperatures, and the invention therefore aims to prevent the development of heat in the flame area by means of simple but effective measures and to dissipate this heat in a targeted manner.

To solve the problem, it is intended that the installations from 1

gas-permeable ceramic material, for example honeycomb ceramic, or perforated ceramic plates.

This inventive design results in the advantage that the gas permeability of the ceramic or, to an even greater extent, the perforated ceramic plates increase the surface area of the ceramic body, so that it is better able to absorb and release heat.

■ ^! In an embodiment of the invention, it is proposed to design the fittings from ceramic fragments or granules, which are held in heat-resistant containers made of mesh or mesh. This embodiment of the invention makes it possible to use ceramic waste material in a beneficial way, so to speak, without having to manufacture and process separate bodies.

need to be processed.

p In a further embodiment of the invention, it is proposed that the installation associated with a single burner rod consists of two side walls and a ceiling Z connecting these side walls, having recesses and covering the burner rod.

This allows the burner to be enclosed, so that a radiant combustion chamber is created within the actual appliance combustion chamber. All of the heat from the gas flame can thus be converted into radiant heat.

This leads on the one hand to a cooling of the flame, and on the other hand to a particularly good energy utilization of the flame, without reaching the temperatures at which nitrogen oxide formation noticeably occurs.

Embodiments of the subject matter of the invention are illustrated in the drawings and explained below with reference to these drawings.

In detail:

Figure 1 shows a first embodiment of the subject matter of the invention in cross section and

Figure 2 diagrammatically, Figure 3 shows a second embodiment in cross section and Figure 4 diagrammatically,

Figure 5 shows an installation for a single fuel rod in cross section and

Figure 6 in a side view and Figure 7 in a plan view, jf Figure 8 shows a cross section according to XIV-XIV of the Figure 9, which shows the mounting of plate-shaped fixtures.

Figures 1 to 4 show variants of plate-shaped fittings made of gas-permeable ceramic material. For the plates 3 according to Figures 1 and 2, for example, so-called honeycomb ceramic can be used as the material. According to Figures 3 to 4, on the other hand, it is provided that the fittings 3 and 4 consist of ceramic fragments or granules and that this material is kept dimensionally stable in a container made of heat-resistant mesh, grid or the like. This heat-resistant mesh or grid can consist of metal, for example, it can also be designed as a wire mesh. A grid or mesh made of fiber ceramic or pressed ceramic is possible. Such a structure is characterized by high heat absorption capacity and thermal conductivity.

The internals 3, 4 or 5 according to the invention could, within the scope of the invention, also be successfully arranged between longitudinal groups of mixture outlet openings of one and the same burner rod.

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Finally, an installation associated with a single burner rod 1 can - as shown in Figures 5 to 7 - also consist of two side walls 6 and a cover 7 connecting these side walls 6, which is penetrated with openings 8 in order to prevent heat build-up within the combustion chamber. In this case too, the cover 7 proves to be useful for absorbing and dissipating heat from the area of the burner flames.

According to the embodiments according to Figures 8 and 9, the plates 11 forming the built-in components are supported with their upper and lower edges in U-shaped profiled rails 10 running parallel between burner rods and laid with cavities facing each other that form a guide. The plates 11 can be pushed into these guides from the side and arranged as built-in components, either lying flush against each other or at any distance from each other.

Claims (3)

•·· ■ · ft • · · · ft ft Joh. Vaillant GmbH u. Co GM 679 2 8. JuIi 1988 isprüche 1. Injector gas burner with at least one burner rod, which is fed with a gas-air mixture via at least one gas nozzle and this associated mixing tube, the wall of the burner rod having mixture outlet openings on its upper side and in the flame area above the mixture outlet openings the combustion chamber is divided and structured by internals, characterized in that the internals (3, 4, 5, 10) consist of gas-permeable ceramic material, for example honeycomb ceramic, or perforated ceramic plates. 2. Injector gas burner according to claim 1, characterized in that heat-resistant containers (9) made of grid or mesh components (3, 4) made of ceramic fragments or granules (8) keep them dimensionally stable. 111!·· t > 3. Injector gas burner according to claim 1, characterized in that the installation associated with a single burner rod (1) ;■ consists of two side walls (11) and one of these side walls (11) connecting, recess ceiling (16) having openings (12) and covering the burner rod (1). till I I