DE2114619C3 - Burners for liquid, gaseous or powdered fuels - Google Patents

Description

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can be seen and that at the outlet end of the tube combustion chamber too

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dt ^ Brennstottaustntts a baffle plate formed from a solid disc (4) is provided for Dral.erzeugung strongly against the normal plane of the axis of symmetry (AA) employed f

en has inlet and outlet openings.

2. Burner according to claim 1, characterized in that so that the Durchtnttsschlitzen (5) straight from the outer edge of the baffle to the inside

airflow

£ “the one with the

and a

hai-. · opening a hamlet

of combustion air

fed. Both air planes of the axis of symmetry (AA) seen blades ^with --- "-_ -. _{A (i (iilion} passage slots (5) do not overlap with each _{other- a 5} here again around the pure add, non the in and Has exhaust openings

correct burner output increases fuel throughput

cover combustion air
characteristic changed

according to claim I or 2. thereby Fin-rirenform and the F

in that the extension could be the (20) Since ^{autser aci} _Repel -

am wide. ™ radially inwardly extending air-quantity control each * "TCRC type Contro l of Re edges (21) is absent from adjacent outlet openings, it is in o.esem burner does not ™> 8 ^ hJhgen the baffle plate (4) a distance ( a) of 35, for example, from the if ^h 8 ^eorf ° ^e * ^e " _η ^Κ ^ ¹⁸ ^ of the axis of symmetry, of which about half the imposed disturbance variables • ^ 'Ä ™ ^d ^ ° ^with the distance (/>) of the radially inner ends the universal usability to be granted ser edges amount Based on this, it is the task of the present

4. Burner n £ h one of claims 1 to ?, the invention. A burner of the type indicated at the beginning, characterized in that the baffle plate (4) 40 is of the kind to be created. which, in a simple sense of the word, forms a co-adaptation of the flame character ^that opens up in the direction of flow.

5. Burner according to one of claims 1 to 4, application case allowed. A "A" _r .h, ^ characterized in that in AustriUsspalt According to the invention this object is comparable axially gcfür the outer air stream (arrows 13) 45 dissolves, daii / ur /onemve.sen setting. Austriti.slaufende Lcitschaufeln (17 ) are provided. gap. through which the air artomt in a twist-free manner

6. Burner according to one of claims 1 to 5, several independent from one another movable Segd characterized in that provided for guiding the elements of the existing cover " _and " d outer air flow (arrows 13) a conical that at the triggering end of the ^^^ 'J "'"" ⁶ "" inwardly towards the axis of symmetry (AA) , an outer wall (15) running in the axial area of the fuel is provided.

disc is provided. strong for generating swirl geaen the normal plane of the axis of symmetry

provided passage slots with each other not overlapping-

has the inlet and outlet openings.

This allows according to the set

The invention relates to a burner for nutty, power of a given supply amount of combustion gaseous or dusty fuels with an air in the storage room through a zone-wise on-fuel supply device, arranged around the concentric fit of the free cross-section of the discharge gap tube for a radially inner air flow for the radially outer air flow whose speed is an air volume setting at the air inlet end to optimize the combustion values development has, with one of the outlet end of this prevailing in the individual angle areas Ver-Rohres surrounding annular, adjustable ratios can be adjusted, while at the same time, under step gap for a radially outer air flow and with the prevention of coke build-up the flame shape a common air space surrounding the burner, the predetermined combustion chamber dimensions are well provided fits, the flame stability improves and em about

Such a burner, in which the radially inner occurring resonance noise of the flame is avoided as well as the radially outer air flow can be swirl-free into the. The simultaneous feeding of the

adjustable, radially inner air flow through the baffle plate, which creates a strong swirl against the normal plane of the axis of symmetry made passage slots with them. *, not overlapping Has inlet and outlet openings, can be used for the formation of a protection zone at any performance between the dam plate and the fiammeii root be taken care of, whereby the settling of fuel oil residues or coke on the side of the baffle plate facing the flame is avoided and at the same time A sufficient air supply in the return flow area is guaranteed.

In an advantageous embodiment of the invention, the passage slots run in a straight line from the outer one Edge of the baffle inwards. As a result, these slots can be cut in a simple manner by sawing getting produced.

In a further advantageous embodiment of the invention, the extensions of the most radially inwardly extending edges of the bendchbaitcn outlet opening of the disc have a distance α from the axis of symmetry which is about half the distance h of the radially inner ends of these edges. This ensures that the air film exiting through a slot completely floods the baffle plate surface, especially on the inside, up to the next slot, thereby reliably preventing coke from forming.

The baffle plate preferably forms one in the direction of flow opening cone. With such a design of the baffle is approx Adaptation to the shape of the flame root results in a very stable flame guide in all settings achieved, which avoids the flame tearing off even with a high excess of air, especially since the No axial air passage openings having. The arrangement of the passage slots in the baffle plate rather causes a thinner Place an air curtain between the flame root and the baffle plate surface and thereby the baffle plate both keeps clean and cools.

In a particularly preferred embodiment of the invention, there are in the exit gap for the outer Air flow axially extending guide vanes provided. As a result, every possible twist in the preliminary room is wild for the combustion air, and the radially outer air flow is definitely free of swirl fed from the outside of the flame. Through this supply of swirl-free air, the interaction with the strongly swirling radially inner air flow an intensive mixing of fuel and combustion air achieved.

In a further advantageous embodiment of the invention, as shown in patent specification 65 616 des Office for invention and patent system in East Berlin is known per se, for the guidance of the external Air flow provided a conically inwardly extending outer wall towards the axis of symmetry.

An embodiment of the invention is shown in the drawing and is sewn in the following described. It shows

F i g. 1 shows a longitudinal section through the front part of a burner according to the invention with rotary atomization,

F i g. 2 the burner in the view from the combustion chamber.

To improve clarity, FIG. 1 the inner, rotationally symmetrical Parts of the liquid burner used to explain the invention, namely a rotating one Cup 1 and an outer guide 2 for the deflecting air flow indicated by arrows 3, uncut shown. Fuel squirting from the front edge of the cup 1 is caused by the deflecting air deflected in the direction of the flame and, in doing so, as well as then with combustion air mixed. With a pressure atomization or ίο with combustion of gas, the deflecting air flow is superfluous.

In the axial area of the front edge of the cup 1 there is a certain radial distance from the guide! ^f explained in more detail ÜR the deflection gap with a Stauscheibe4, as described below, against the axis of symmetry AA strongly employed passage slots 5 are arranged. The baffle plate 4 is attached to an outer tube 6 serving as a cover. The pipe6 covers an inner one, the guide! for the deflecting air surrounding space 7 against an outer Vorlagerauin 8 for the combustion air. Via an annular opening 19 interrupted by supports 9, the cross section of which can be changed by means of an annular slide II which can be displaced in the direction of the axis AA . the front room 8 is connected to the room 7.

Combustion air is introduced in a known manner by means of a fan into the storage space 8, which is delimited on the inside by the pipe 6 and on the outside by a wall, not shown, curved about the axis AA. The pre-storage space 8 is via an annular outlet gap 12 for a first, radially outer air flow, which is indicated by arrows 13. open to the combustion chamber 14 before the burner. The annular outlet gap 12 is delimited on the outside by an outer wall 15 of the liquid burner, which rests against the combustion chamber wall 16 and is supported on the pipe 6 by distal screws (not shown). To eliminate any swirl in the combustion air in the preliminary space 8, axial guide vanes 17 are provided in the outlet gap 12 for the first, radially outer air flow between the pipe 6 and the outer wall 15. On the pipe 6 in the area of the exit span there is a ring 18 which is divided into individual segments 18 ″, 18 b and is displaceable in the direction of the axis AA change the first, radially outer air flow at the end of the annular outlet gap 12 on the combustion chamber side.

The arrangement of the passage slots 5 in the baffle plate 4 can be seen particularly well from FIG. These are passage slots 5 which run radially from the outside inwards and impart a strong twist to the second, radially inner air stream flowing through them. The passage slots 5 su are arranged so that the extension 20 of the furthest radially inward edges 21 of adjacent outlet openings of the baffle plate 4 have a distance α from the axis of symmetry which is about half the distance b of the radially inner ends of these edges.

Inside the rapidly rotating cup 1, 65 is supplied to this fuel, for example heating oil, sprayed radially from its edges and exiting the cup 1 and the guide 2 through the avian Deflecting air (arrows 3) in the direction of the

Distracted combustion chamber 14. Radially behind the guide! for the deflecting air, the particles hit the second air stream of the combustion air, the direction of which is indicated by arrows 23, which is fed in a rear part of the liquid burner from the preliminary space 8 through the opening 10 and via the space 7 and in the vicinity of the guide! for the deflection air is also directed in the axial direction AA . As a result, the fuel particles are initially deflected further towards the combustion chamber 14 and thus reach a certain distance from the surface of the baffle plate 4. In the space between the fuel particles and the baffle plate 4, a backflow area is created, which is often referred to as a protection zone. In this area, the baffle plate 4 has the task of stabilizing the flame, radiating absorbed heat back to the flame root in order to promote the evaporation of further fuel particles and to effect the intensive mixing of air and atomized fuel through the formation of eddies.

Due to the arrangement of the ring slide 11 to partially cover the opening 10, a continuous Volume regulation of the second air flow brought about. By varying this amount of air the ratio of the quantities of the two combustion air flows can be changed. This is a further influence on the flame characteristics is possible. So has a relatively small percentage of air conducted through the baffle plate 4, for example, results in the cooling of the baffle plate 4 is reduced and a stronger thermal radiation from the baffle plate 4 to the flame root occurs

1 sheet of drawings

Claims (1)

Patent claims: 1. Burner for liquid, gaseous or dusty fuels with a fuel supply device, around which a pipe for a radially inner air flow is arranged concentrically, which has an air volume adjustment at the air inlet end, with an annular, adjustable "A" which surrounds the outlet end of this pipe «P.lt for a radially outer air flow and with a common air supply space surrounding the burner, characterized in that for zone-wise adjustment of the exit gap (12) through which air x ₅ (arrows 13) flows out without twisting, one of several independently movable Segments (18 «. 18 6) existing cover ring (18) is provided and that at the outlet end of the tube more or less to * The high J ^ ° e ^ vin must, ^ fts ^ om ^ uhrt w.rde FlanunaKöbdjW ^ Back
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An influence on u ύS _{to do this} , _the fuel