EP0967436B1 - Cascade-burner - Google Patents

Description

The invention relates to a gas burner system with at least two burner bodies according to the preamble of claim 1.

Such an atmospheric gas burner system is known (DE 87 08 194 U1). It has a plurality of burner bodies with an inlet opening at a mixer, in the z. As LPG or natural gas and primary air can be introduced, and a Brennauslaß for discharging a gas mixture from the fuel gas and due an injector via the inlet opening with supplied primary air. At the Brennauslaß is arranged a burner sieve, over which finally the Flame trains. To complete the combustion becomes the area supplied secondary air above the burner screen. In practice have become Burner body with a power of 2 to 3 kW as a burner unit especially proven. Set cascade gas burner systems with multiple burner bodies a multiple heating power available to a single burner body.

To realize a compact construction in the known gas burner system to be able to, the required combustion air, d. H. the primary and the Secondary air, supplied horizontally via an air inlet, in the gas outlet direction runs at the gas nozzles. At a side to the gas outlet direction Air supply is observed that the first arranged in the air flow direction Although burner unit is sufficiently supplied with primary air, but the behind the burner units, that is, adjacent to the first burner unit Attached burner units, not enough primary air received, so that optimal combustion can not be achieved. The insufficient supply with primary air is due to the fact that due to the injector effect at the first burner unit, the fresh air flow is disturbed such that for the - Seen in air flow direction - behind burner units none adequate air supply is guaranteed.

From DE 38 11 477 A1 an atmospheric gas burner is known, the comprises a plurality of burner body with upstream mixing tubes. So with each adjacent arranged mixing tubes sucking the primary air in the area are not obstructed by the inlets, the inlets are in different, distanced from each other, perpendicular to the axes of the mixing tubes levels arranged. In radially arranged mixing tubes, these can be in different horizontal planes run before they turn over in the bottom open a burner chamber.

From EP 0 534 554 A2 is a gas burner system with several burner bodies known, each of which has a mixing channel with an inlet opening and having a combustion outlet. The burner bodies are of a combustion chamber housing and surrounded by an air inlet. The burner bodies are in two rows arranged, wherein the centroids of the inlet opening cross sections of the Rows lie at different height levels, while the burners exits are arranged substantially in the same plane. Inside the rows the inlet opening cross-sections are at the same height level. The supply with combustion air by means of a fan from below.

The invention is based on the object, a gas burner system with at least specify two burner bodies of the type mentioned, in which at Fuel gas supply lateral fresh air supply sufficient primary air supply is guaranteed.

The object is achieved by the gas burner system according to claim 1 solved. Advantageous embodiments of the invention are the dependent Claims to be taken.

In the gas burner system according to the invention, with at least two fuel bodies, can be at the same height level of Einlaßöffnungsquerschnitte observed problem of incomplete combustion with laterally supplied Virtually eliminate all fresh air due to the offset in height.

It has surprisingly been found that even at minor Height differences between two adjacent inlet openings by 5 mm or 25% of the diameter of the inlet opening cross-sections significantly improved Supply of the inlet openings can be achieved with primary air. A value around 5 mm represents a good compromise between an undisturbed Primary air supply and a limited space.

In a particularly preferred embodiment of the invention, the assigned Brennauslässe each have the same height difference, as the Inlet ports. This makes it possible to each identical burner body use only at different height levels with each other be assembled. This means that this design is not structural requires complex realization.

In a further preferred embodiment of the invention, the inlet openings and the firing outlets through an outside of the mixing channel arranged Separation plate separated. This allows the currents stabilize and separate from each other for the primary air and the secondary air. In particular, a deterioration of the injector effect at the inlet openings avoided by the secondary air supply.

Particularly advantageous is the gas burner system according to claim 8. Das horizontal feeding of the air allows a particularly compact Structure of the gas burner system and can now be realized without the previously known impairments in terms of the quality of combustion to be able to watch.

Fig. 1

eine Teil-Perspektivansicht eines Gasbrennersystems als schräge Rückansicht;

Fig. 2

den Teil des Gasbrennersystems aus Fig. 1 in Vorderansicht;

Fig. 3

einen anderen Teil des Gasbrennersystems als Draufsicht:

The invention will be explained in more detail below with the aid of the accompanying figures with reference to an example. Show it:

Fig. 1

a partial perspective view of a gas burner system as an oblique rear view;

Fig. 2

the part of the gas burner system of Figure 1 in front view.

Fig. 3

another part of the gas burner system as a plan view:

Since the figures show the same gas burner system, only in different Views and with varying degrees of detail, is their description together.

The gas burner system comprises two identically constructed burner units, the have identical, essentially made of sheet burner body 1. 2, wherein the burner body 2 at a slightly higher height level than the Burner body 1 is arranged.

Each of the burner body 1, 2 has a curved mixing channel 3 with a serving as an inlet opening horizontally lying air inlet funnel 4 on the input side End and an upwardly open combustion outlet 5 at his on the other end. The air inlet funnel 4 has a circular inlet opening cross section 4a on. The combustion outlet 5 is passed through a burner screen. 6 covered, resulting in a particularly uniform outlet of the gas mixture and thus a uniform formation of the flame above the burner screen. 6 allows.

In front of the air inlet funnel 4, a gas nozzle 7 is concentric with the inlet opening cross section 4a, which is for introducing a gas jet of fuel gas, d. H. Liquefied gas or natural gas in the mixing channel 3 is used. By the high Speed of the gas jet becomes primary air due to its injector action entrained as a fresh air from the outside via a recognizable in Fig. 3, a Combustion chamber 8 penetrating air duct 9 is supplied.

The combustion chamber housing 8 and the air channel 9 are shown in Fig. 3 only schematically shown. It is relevant that the air flow through the air duct 9 laterally the air inlet funnel 4 of the burner body 1 and 2 meets. The combustion chamber housing 8 encloses except the air duct 9 and the burner units also the actual combustion chamber with the trained over the burner sieves 6 Flames.

The air duct 9 also supplies the secondary air passing through the above Burner strainer 6 forming flame is sucked in and a complete combustion ensured on the burner screen 6 exiting gas mixture. ever Depending on the design, the secondary air can also be supplied via a separate fresh air duct be supplied.

The burner body 1, 2 are interconnected by webs 10 and on a bottom plate 11 is fixed such that the centroids of the inlet opening cross-sections 4a, i. the centers of the entrance of the air inlet funnel 4 recognizable circular cross sections, at different height levels lie with respect to the horizontal. Depending on the size, the height difference in a range of 15 to 50%, preferably 25% of the diameter of the Inlet opening cross section 4a lie. If apart from those shown in the figures Burner bodies 1, 2 more burner units are grown, are their Inlet opening cross sections 4a also at a different height level. In Fig. 3 is indicated by the webs 10 that further burner body provided can be.

Part of the incoming air via the air channel 9 primary air is through the gas nozzle 7 flowing gas jet in the, with respect to the air flow direction seen, first burner body 1 sucked into the air inlet funnel 4 and mixed in the mixing channel 3 with the liquefied gas. The remaining one Part of the primary air flow from the air duct 9 passes largely undisturbed to the gas jet of the second burner body 2, where again primary air with the Liquefied gas is blown into the air inlet funnel 4. This method Repeats depending on the number of burner body.

By the height offset of the inlet opening cross sections 4a of the air inlet funnel 4 or by the height offset of the entire burner body 1, 2 it is possible, even the - seen in the air flow direction - second burner body 2 let enough primary air unhindered. The injector effect on the burner body 1 is not sufficient, the primary air supply to the burner body. 2 to affect effectively.

In the described embodiment, the fresh air supply takes place through the Air duct 9 in the horizontal direction. However, it is without affecting the Function also possible, the fresh air flow with respect to the horizontal angle or to feed vertically.

In support of favorable combustion by calmed primary and Secondary air flows between the air inlet funnels 4 and the Brennauslässen 5 and the burner sieves 6 outside of the burner bodies 1, 2 a partition plate 12 shown only in Fig. 1 provided in the form of a thin sheet. The partition plate 12 ensures that the flame caused by the flame Secondary air flow has no negative influence on the primary air flow on Air inlet funnel 4 has.

Claims (8)

1. Gas burner system with at least two burner heads (1, 2), each of which has a mixing duct (3) with an inlet aperture into which fuel gas and primary air can be introduced, and a burner outlet (5) for emitting a mixture of fuel gas and primary air, and which are surrounded by a combustion chamber casing (8) with an air inlet for fresh air, characterised in that the centre of the area of each of the inlet aperture cross-sections (4a) is at a different height from the horizontal.
2. Gas burner system in accordance with claim 1, characterised in that the difference in height between two adjacent inlet apertures is in a range from 3 to 10 mm.
3. Gas burner system in accordance with claim 2, characterised in that the difference in height between two adjacent inlet apertures is 5 mm.
4. Gas burner system in accordance with claim 1, characterised in that the inlet aperture cross-sections (4a) each correspond to a circular surface and the difference in height is in a range between 15 and 50% of the diameter of the circular surface.
5. Gas burner system in accordance with claim 4, characterised in that the difference in height is 25% of the diameter of the circular surface.
6. Gas burner system in accordance with one of the above claims, characterised in that the burner outlets (5) each have the same difference in height as the inlet apertures.
7. Gas burner system in accordance with one of the above claims, characterised in that the inlet apertures and the burner outlets (5) are separated by a separation plate (12) mounted outside the mixing ducts.
8. Gas burner system in accordance with one of the above claims in which a gas jet is mounted concentrically in front of each inlet aperture of the mixing ducts inside the combustion chamber casing (8), characterised in that the air inlet of the combustion chamber casing (8) forms an air duct (9) through which the fresh air can be introduced at least into the inlet apertures in a horizontal direction.

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