AT389934B - Atmospheric gas burner - Google Patents

Abstract

Atmospheric gas burner with a plurality of approximately vertically arranged mixing tubes 2 which serve for supplying a gas/air mixture and which open jointly into a burner chamber 1 surrounded by a wall having fuel outlet orifices on its top side, the mixing tubes 2 being arranged below the burner chamber, the initial region of the mixing tubes which in each case faces a gas nozzle 4 being arranged virtually horizontally, and the mixing tubes having a deflection 13. In order to achieve the object of ensuring that the inflows of air into the mixing tubes, as far as possible, do not impede one another, the inlets 3 of the mixing tubes 2 are arranged in different vertical planes, for example staggered or offset relative to one another. <IMAGE>

Description

No. 389934

The invention relates to an atmospheric gas burner with a plurality of, approximately vertically arranged, mixing tubes serving to supply a gas-air mixture, which jointly open into a burner chamber enclosed by a wall with fuel outlet openings on the top, the mixing tubes being arranged below this burner chamber and the an initial region of the mixing tube facing a fuel nozzle is arranged almost horizontally and the mixing tubes are provided with a deflection.

From US-PS 4 624 240 a grill gas burner has become known, which consists of a burner chamber, on the underside of which two mixing tubes are connected, which have air inlets and are designed so that they can be bent horizontally and run essentially parallel. Nothing is said about the degree of gas-air premixing and nitrogen oxide minimization

A cast gas burner has become known from GB-PS 102 510, in which a mixture tube is assigned to each combustion chamber. Here too, nothing is said about the degree of air premixing and the minimization of pollutants

It is an object of the present invention to provide an atmospheric gas burner of the type mentioned in the introduction, in which a complete or almost complete addition of primary air is possible for complete combustion

According to the invention the object is achieved in that the inlets of the mixing tubes are arranged in different vertical planes, for example staggered or offset from one another. This configuration makes it possible to minimize the horizontal space requirement for the burner, since the gas mixture supply can be built up in several vertically lying levels by the bent mixing tubes. In addition, an obstacle to the inflow of primary air into the mixing tubes is largely avoided.

In an embodiment of the invention it is proposed that the inlets of the mixing tubes and the fuel supply nozzles assigned to these inlets lie on circles which are concentric with the central burner chamber. This configuration results in the greatest possible distance between the inlet ends of the individual mixing tubes, so that here the primary air can flow freely into the mixing tubes.

The features of the invention are explained below for the sake of better comprehensibility on the basis of exemplary embodiments which are illustrated in the drawings.

In these drawings:

FIG. 1 shows the top view of a burner,

Figure 2 shows a variant embodiment.

The cylindrical burner chamber (1) shown in FIG. 1 is supplied with a fuel-air mixture via the mixing pipes (2) arranged in any number below the burner chamber (1). The inlets (3) of these mixing pipes (2) are gas supply nozzles (4) coaxially assigned at a distance (5) The fuel stream emerging from each nozzle (4) takes primary combustion air into the interior of the mixing tube (2) when entering the inlet (3) assigned to it from the intermediate space (5), which is located inside of the mixing tube (2) intimately mixed with the fuel The mixing tubes (2) are arranged almost horizontally in the starting area (12) facing the assigned gas nozzles (4) and are provided with a deflection (13) in order to be perpendicular to the underside of the burner chamber (1 ) to flow.

According to the variant according to FIG. 1, the mixing tubes (2), starting from the inlet (3), initially run parallel to one another and open essentially perpendicularly into the burner chamber (1).

FIG. 2 shows, for example, a prismatic radiation body (14), the burner chamber (1) of which is supplied via a group of mixing tubes (2) which run in two horizontal planes (8).

Figure 1 shows an embodiment in which the mixing tubes (2) are arranged radially with respect to a central burner chamber (1). These mixing tubes (2) can be arranged in any number, which determines the performance of the burner, in two or more horizontal planes (8, 9).

The inlets (3) of such radial mixing tubes (2) and the fuel feed nozzles (4) assigned to them lie on circles (10) and (11) which are concentric with the burner chamber (1). As a result, the nozzles (4) can be connected to one another and supplied via ring lines (not shown).

The burner chambers of such burners are preferably provided on their upper side with a radiation body (14), that is to say, the upper region of which has the fuel outlet openings covers a cavity, on the upper side of which the burner flames are evenly distributed «!. This area of the wall is expediently formed from a layer of a gas-permeable material, for example from a fleece, felt or the like, from steel wool, ceramic wool or the like; this layer can be held true to shape and supported by a rigid support made of steel or ceramic. -2-

Claims (2)

No. 389934 PATENT CLAIMS 1. Atmospheric gas burner with several, approximately vertically arranged mixing tubes serving for the supply of a gas-air mixture, which jointly open into a burner chamber enclosed by a wall with fuel outlet openings on its upper side, the mixing tubes being arranged below this combustion chamber and the starting area of the mixing tubes facing a fuel nozzle is arranged almost horizontally and the mixing tubes are provided with a deflection, characterized in that the inlets (3) of the mixing tubes (2) are arranged in different vertical planes, for example staggered or offset from one another (FIG 2). 2. Burner according to claim 1, characterized in that the inlets (3) of the mixing tubes (2) and these inlets (3) associated fuel supply nozzles (4) lie on circles (10, 11) which are connected to the central combustion chamber ( 1) are concentric (Figure 1). For this 1 sheet drawing -3-