DD143464A1 - RADIATION BURNER WITH RADIAL FLAT FLAME FOR MULTIPLE FUEL TYPES - Google Patents

Description

212 6 2

Title of the invention

Radiant burner with radial plaque flame for several types of fuel gas

Application area of the invention

The invention relates to gas burners for industrial furnaces for heating and heat treatment processes.

Characteristic of known technical solutions

In order to produce a radial flat flame, it is known to couple a mixing device for fuel gas and air with a torch stone which expands like a dome.

It is known to supply the combustion air in a funnel-shaped widening head through tangentially opening openings in several levels, while the fuel gas supply through at least two cylindrical coaxial tubes arranged with conically widened outlet ends / DD PS 69 659s DD PS 97th

The combustion air passes in another solution at tangent ialer introduction to a helical channel, wherein the air flow undergoes intensive rotation and enters through an annular cross-section in the mixing chamber, while the fuel gas is supplied via an inner tube and the burner head via 6 radial openings in the air stream is blown in / Dolezel, J. »and Eavlicek, M .: The use of burners with radial flame propagation in industrial furnace construction (Czech Republic). Hutnicke aktuality 15 (1974) 1, pp. 1 - 81. Translation Brennst of f inst it ut Freiberg 1975 V.

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Furthermore, in a similar solution with tangential introduction of the combustion air through the helically moving outer air volume flow, the fuel gas is sucked from an inner tube and "air inlet" moves, there intensively mixed with the air and swirled and supplied to the flared burner stone / Dolezel, J ·, And Havlicek, M., The use of burners with radial flame propagation in the industrial furnace construction (Czechoslovakia)., Hutnicke aktuality 15 (1974) 1, P. 35 -36th Translation BrennstoffInstitut Freiberg 1975 * / ·

All technical solutions known hitherto adhere to several or one of the following disadvantages:

- High suitability for different fuel gases, especially in the temperature range below 1000 ⁰ C,

- complicated or impossible installation in very thick furnace walls,

- problems with the use of highly heated combustion air,

- complicated and expensive production and

- high required air flow pressure.

, Aim of the invention

The aim of the invention is to provide a low-noise radiant burner with radial flat flame for uniform and extensive intensive heating furnace inner walls and kiln inserts, despite the simple production of town gas, natural gas and LPG-air mixtures regardless of the temperature level with sufficiently low air pressures and any Luftvorwärmtemperaturen without every change in the burner burns stably, is suitable for any wall thickness and, in particular, when changing over from one type of fuel to another, leads to considerable savings in working time and material.

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Presentation of the "essence of invention

The invention has as its object to provide a low-noise radiant burner with radial flat flame for extensive uniform heating of furnace wall surfaces and to intensify the 'heat transfer, without any change for the fuel gases city gas, natural gas and LPG-air mixtures in the temperature range below 1OOO ⁰ C. is suitable, which can also be installed in very thick furnace walls and ensures the use of highly heated combustion air ·

The radiant burner according to the invention, with radial ;: Flachf flame for several types of fuel consists of a fuel gas and combustion air supply, which is formed by two concentrically arranged tubes, a swirl body for both media and a burner brick with a dome-like extended opening. The swirler has two sets of fluid passage holes, jiichialich an inner bolt circle for the fuel gas, the bore axes are located on the mantle of an imaginary truncated cone whose larger circular area is closer to the burner block, and an outer circle of holes for the combustion air, the bore axes tangents represent to an imaginary cylinder such that between the axis and the contact surface line an angle of 30 ° is formed and that in addition axially a fuel gas outlet opening is provided, which is upstream of 1.2 times their diameter relative to the common hole exit plane for air and fuel gas and an outlet cross-section of 30 % of the total exit cross section for fuel gas.

Due to the oblique air supply openings a manifolded tangentially twisted air volume flow is generated in the also manifold fuel gas partly injected, partly sucked and so intimately and turbulently twisted and swirled that despite simple production, the radiant burner with radial flat flame regardless of the fuel gas, the Air preheating and the temperature level can be operated stably without any change. The found © solution is suitable for any wall thicknesses of the furnace, the disturbance of the wall construction by the burner installation a minimum

FIG. 1: FIG. 2: FIG. 3: FIG. 4: Fig ^.:

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wearing

embodiment

The invention will be explained below using an exemplary embodiment. The accompanying figures show:.

Swirl body (top view)

a) section AA of the swirl body according to FIG. 1

b) Section BB of the swirl body according to Fig. 2a Radiation burner with radial flat flame high-speed burner

Axial flame burner

The fuel gas and the combustion air are supplied to the swirl body through two concentrically arranged tubes 85 9 (FIGS. 1 to 3). Ini swirler becomes the combustion air through an outer bolt circle 1 whose bore axes represent tangents to an imaginary cylinder such that between axle and touched Mantellinie an angle of 30 ° is formed (Figure 2b) helically twisted; it applies infoige of the centrifugal forces acting on the air flow to the flared burner stone.

The fuel gas is supplied to 2/3 of the volume flow through an inner hole circle 2, the bore axes are located on the mantle of an imaginary truncated cone, the larger circular area is closer to the burner block, and to 1/3 by an additional axial fuel gas outlet opening 3 to the 1.2 times its diameter upstream of the common hole exit plane; In the helically twisted air flow, which is often branched generated and in the axial direction, a negative pressure, the fuel gas is injected and sucked through the holes 2 and 3 and homogeneously mixed with the combustion air due to the extensive beam splitting and helical twisting, resulting in essentially in which the mixing element 4 adjoins the swirl body. The stable radial flat flame, which forms at the flared burner stone 5, ensures a uniform, wide-area heating.

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tion of burner stone, wall and trimming and intensive heat transfer. ,

By replacing the flared burner stone 5 by a combustion chamber 6, the burner operates as a high-speed burner and through a burner furnace with frustoconical

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geröffnung 7 as axial I'lammenbremier ·

Claims (6)

1. Radiant burner with a radial flat flame, for a plurality of combustion gas species, and any combustion air temperatures, consisting of a fuel gas and COMBUSTION ^l tion, which consists of two concentrically arranged tubes, a swirler for both media and a quarl with bell-shaped extended opening in the fact that the swirl body has two groups of media passage, namely a large pitch circle for the fuel gas, the bore axes of which are on the mantle of an imaginary truncated cone whose larger circular area is closer to the burner block, and an outer circle of holes for the combustion air, whose Bohru- ngsachsen tangents to an imaginary cylinder represent the-. Art that between the axis and the contact surface line an angle of 30 ° is formed and that in addition axially a fuel gas outlet opening is provided, which is upstream by about 1.2 times its diameter relative to the Lochaustrittsebene for air and fuel gas and an outlet cross-section of about 30% of Total exit cross section for fuel gas has. 2. Radiant burner with radial flat flame "according to item 1, characterized in that on the common hole plane of the swirler, the sum of the fuel gas outlet cross sections is above or below 70 % of the total Brenngasaustrittsquerschnittes. -7- 2 2 12622 invention claims 3. Radiation burner with radial flat flame according to 1 _9, characterized in that the Eohrungsachsen the outer circle of holes for combustion air tangents to an imaginary cylinder represent such that an angle of 10 to 60 ° is formed between the axis and the contact surface line. 4. Radiation burner with radial flat flame according to Punkt.1, characterized in that the axes of the fuel gas outlet openings are on the mantle of an imaginary truncated cone whose smaller circular area is closer to the   I nerstein is located. Radiant burner with radial flat flame according to item 1, characterized in that the arrangement and design of the air outlet and the swirl system is coupled with an oil nozzle. 6 burner according to PunpBBhiis 4, characterized in that instead of the burner s s with kelchartiger extension other burner block shapes, such as combustion chambers for high-speed burners or burner bricks for axial flame burners are used. Ze / dinunoen