EP0706010A2 - Heating appliance having a nozzle assembly - Google Patents

Abstract

The heating device after combustion chamber receives flue gases sucked from the main combustion chamber (2) via the primary outlet and mixed with secondary air (5) via a nozzle arrangement. The conduits for the flue gas between the primary outlet of the combustion chamber and the after combustion chamber (13) are formed at least over a part of their length as a nozzle arrangement, in which the flow cross-section for the flue gas measured over at least a part of this extent is reduced in the horizontal. In the area of the nozzle arrangement, the feed of secondary air and the flue gases occurs to a first exhaust gas feed-back. The nozzle arrangement is wider than it is high. The individual nozzles are arranged via hollow feed bodies (24,25) for secondary air and for the first exhaust gas feed-back.

Description

The invention relates to a method for burning solid fuels in particular, and a corresponding device.

Solid fuels are used in many small systems as lockable fireplace inserts etc. for heating living spaces, whereby open operation is often also desired so that the visual experience of the open fire can be enjoyed.

Solid fuels such as wood waste, straw, combustible waste are burned on a large scale in industrial plants, whereby the focus is exclusively on energy generation and burning with the lowest possible emission of pollutants.

In order to improve both the energy yield and, above all, to reduce the pollutant content of the flue gases, it is already known not to discharge the flue gases directly to the environment, but to first burn them again in an afterburner with additional combustion air, the so-called secondary air, since in primary combustion chamber in the case of solid fuel combustion, the combustion generally does not yet proceed completely sufficiently, and therefore the flue gases still contain a large number of combustible, not yet oxidized particles, including comparatively high levels of substances to be classified as pollutants.

It is therefore the object of the invention to provide a nozzle arrangement for such a heating device which is simple and inexpensive in its application or in its construction, and yet results in a high energy yield of the fuel and a low pollutant content of the flue gases to be released into the environment .

This object is achieved by the characterizing features of claim 1. Advantageous embodiments result from the subclaims.

For heating devices that are set up visibly in living rooms, a wide but not very high nozzle arrangement in the rear wall of the combustion chamber is generally desirable for optical reasons. In order to enable the best possible admixture of the remaining components and effective post-combustion in the after-combustion chamber, the flue gases of the primary exhaust are passed to the after-combustion chamber through several vertically adjacent nozzles, so that these nozzles have a reduction in their flow cross-section in the vertical direction of view.

In order to enable an optimal admixture of secondary air and flue gases from the first exhaust gas recirculation, each nozzle is formed by the distance between two feed bodies arranged vertically next to one another, which in the top view have an approximately triangular or frustoconical cross-section, with the tip to the combustion chamber and the base towards the afterburner. These feed bodies are hollow, and are supplied with secondary air and / or the flue gases of the primary exhaust gas recirculation system, and therefore have corresponding outlet openings in the region of their side faces towards the nozzles formed between them.

However, the constructional effort for such a nozzle arrangement is relatively high, since several feed bodies, mostly made of fire-resistant steel sheet, have to be manufactured, must be tightly connected to the corresponding supply lines, and moreover, a frame must be present which encloses the entire nozzle arrangement for assembly reasons. which can be inserted into a corresponding opening in the rear wall of the combustion chamber. If you also consider that such a construction made of sheet steel has enormous thermal expansions (from 20 ° C to 1000 ° C: 10 to 20 mm per meter length), it becomes clear that such a steel sheet construction is subject to a very strong distortion in the presence of temperature fluctuations and, under certain circumstances, the existing weld connections, bending edges, etc. can tear over time. In order on the one hand to absorb these temperature expansions and on the other hand to simplify and reduce the cost of manufacture, preferably only the supply body itself and the supply lines supplying it are produced from bent and welded steel sheets, during which the nozzle device holds together Frame in which the feed body and its supply lines are or are in contact with it and which they penetrate completely or partially, consists of one or more parts as molded bodies made of cast, refractory solid material such as refractory concrete, SIC ceramic, fireclay or the like .

In the case of the supply bodies themselves, the existing cavity can be undivided, and thus serve to supply either secondary air or flue gases from the secondary exhaust into the nozzle arrangement. In this case, a supply body for the supply of secondary air and a supply body for the supply of flue gas from the secondary exhaust are always arranged side by side within the nozzle arrangement, which is achieved by connecting the respective supply bodies to the different supplies.

Another possibility is to subdivide the cross-section of the feed body in the longitudinal central axis by a sheet, and to apply secondary air in one half and flue gases from the secondary exhaust in the other half. On the one hand, however, this necessitates a higher production outlay for the feed bodies, and on the other hand, a more complicated connection with the two mutual feed lines. The feed bodies themselves are either formed from an angularly bent front plate, which forms the tip of the feed body, and a base inserted into the open base, the outlet openings 26 being arranged in rows from the cavity enclosed thereby, preferably in the vicinity of this base, and be produced by punching etc. before bending the front plate. In some cases, corresponding extensions of the base can also project outward through these outlet openings, which results in a positive connection of the two parts.

Another possibility is to design the floor itself in the form of a flat U, the free-ending outer legs of which correspond in their angular position to the legs of the front plate, but have a smaller mutual distance. Such a floor can be welded into the front panel so that its respective free-ended legs end at the same height, and the welds are placed on the bends of the floor. This leaves passage space between the welding points into the free distance between the freely ending legs of the front plate and the floor, which together form the outlet openings of the feed body.

Regardless of whether the supply bodies are accommodated in a surrounding frame or are arranged individually, it is advantageous to make the size of the outlet openings of the gases to be supplied changeable from the supply bodies into the nozzle arrangement. For this purpose, for example, the individual parts from which the feed bodies are made can be adjustable in their mutual distance from one another, the gap therebetween which has been changed thereby representing the outlet opening.

Compared to a feed body consisting of a V-shaped front part and a U-shaped base, it is also conceivable to use a further, second base, so that the three spaced and fastened parts separate two separate feed spaces, but this time one behind the other in the direction of flow through the nozzle arrangement , be created. Their mutual distance and thus the size of the respective outlet openings is preferably set as a function of the residual oxygen content of the flue gases leaving the afterburner. This can be done via an automatic actuator such as a servo motor, or manually, by - for a single feed body or for the entire nozzle arrangement - this mutual distance e.g. can be adjusted using a screw thread.

The fact that the free legs of the floor or floors and the front part of such feed bodies are spaced apart from one another either parallel or even at an acute angle to the end results in advantages over the formation of outlet openings in the form of simple bores or openings in sheet metal walls :

For on the one hand, through these free legs running parallel over a certain distance, a channel-like formation of the outlet opening, formed over a certain flow distance, is achieved, whereby the outflowing gases are forced to flow out by laminar flows, i.e. these gases due to their kinetic energy after leaving the Flow outlet flow relatively far into the space of the nozzle 40, which results in good mixing with the flue gases of the primary exhaust.

On the other hand, this channel-like formation also prevents deposits such as dust, oxidation residues or the like on the Outlet openings, since these are constantly removed by the gases flowing along them. This largely prevents clogging of the outlet openings.

In addition, other shapes in the cross-sectional configuration of the feed bodies are also conceivable:
For example, instead of one or two floors, a tubular profile can follow the front, V-shaped front panel, the cross section of which corresponds approximately to the width of the front part at the rear end. The pipe cross sections themselves and the hollow space formed by the front part and the closely spaced pipe then come into question as supply rooms for secondary air and the flue gases of the first exhaust gas recirculation systems. In order to allow gas to escape from the pipe cross-section, outlet openings must of course also be provided in the pipe cross-section, preferably in the vicinity of the distance between the V-shaped front part and the pipe, but still within the half of the pipe profile facing the front part.

Another solution, which is particularly suitable for primary fume cupboards located in the floor of the combustion chamber, below the fuel, is the use of a front part, which is not V-shaped, but preferably trapezoidal or semicircular, for example a halved tube profile. Arranged at a distance behind it can again be a U-shaped base, the free legs of which, in turn, do not run parallel to one another, but strive outward at an angle.

Compared to the V-shaped front parts, the advantage is that the firing material stored on these feed bodies in this case cannot easily fall into the very narrow cross section of the individual nozzles between the feed bodies and, on the other hand, the contact surface on the feed bodies is larger.

In all cases, the size of the outlet openings can be adjusted relative to one another by adjusting the individual parts of the feed bodies.

The frame itself is preferably formed in one piece, but depending on the design, two or even more individual parts are necessary, the separating surface between two individual parts, either a plane can be perpendicular to the flow direction of the nozzle arrangement, or a plane parallel to it and perpendicular to the longitudinal direction of the feed body.

Such a molded frame is not only easier and cheaper to manufacture, but also has a thermal expansion that is approximately 100 times lower than that of fire-resistant steel sheet. This facilitates the installation of this frame in the opening e.g. in the rear wall of a corresponding heating device, but on the other hand, the much greater thermal expansion of the feed body compared to the frame practically no thermal expansion must be compensated. This is preferably achieved in that in the longitudinal direction of the feed body the free, generally closed, end of the feed body does not lie opposite a boundary surface of the frame that is too close in the cold state. Rather, the feed bodies usually penetrate one - e.g. upper - leg of the frame completely, but end in the opposite - e.g. lower - leg either in a blind hole or also in a through opening of the frame, whereby even at ends in a blind hole there is a sufficient cold distance between the feed body and the bottom of the blind hole in the frame to be able to absorb the thermal expansion.

In the cross-sectional direction of the feed body, the corresponding recesses and openings in the frame when cold are significantly larger than the corresponding outer cross sections of the feed body. In order to prevent ash parts etc. from falling into this space, especially in the openings in the lower leg of the frame, this space can be separated by e.g. on the outer circumference of the molded body and the gap overlapping sleeve made of sheet steel, etc. are covered.

A particularly simple design of the nozzle arrangement is achieved if the supply bodies are used alternately for the supply of secondary air and flue gases from the secondary exhaust, and the supply lines for the two gases for this purpose on the one hand above or in the upper leg of the frame and on the other hand below or in the lower leg arranged of the frame and firmly connected to their respective associated feed bodies, preferably welded. In such a solution, the entire structural units made of sheet steel and consisting of feed bodies and supply lines can be made in one piece and equipped with corresponding openings Simply insert the frame from above or below. The one-piece construction of the frame only has to be dispensed with if the sleeves for covering the gap between the feed bodies and the corresponding recesses in the frame are already firmly connected to the feed bodies before the nozzle arrangement is assembled.

Even in this case, the one-piece design of the frame can be maintained if this frame - viewed from the top - does not completely enclose the feed body, but only on its front side, i.e. towards the combustion chamber, and in the area between the feed body, but not on it Back. this would make it possible to simply push the feed body and thus the entire sheet steel parts of the nozzle arrangement into the corresponding recesses in the frame which are open at the rear, which also partially solves the problem of the gap in the cross-sectional representation of the feed body with respect to the frame, since in the case of a tight insertion in the cold state and subsequent heating, the strongly expanding steel sheet feed bodies automatically move partially out of the recesses of the frame, which open in a wedge-shaped manner towards the rear.

In addition, in the case of a frame cast as a molded part in this way, the nozzle effect of the nozzle arrangement can be further strengthened in that, in addition to the tapering of the nozzles in the horizontal plane, the overall curvature flow cross section is tapered in the vertical plane by the upper and lower legs of the frame is partially or wholly inclined from the combustion chamber side towards the inside of the frame towards the inside.

Fig. 1:

eine Aufsicht auf eine erfindungsgemäße Düsenanordnung,

Fig. 2:

Querschnittsdarstellungen der Bauformen von Zufuhrkörpern,

Fig. 3:

eine rückseitige Ansicht einer dieser Bauformen der Fig. 2,

Fig. 4:

Schnittdarstellungen einer Düsenanordnung, und

Fig. 5 - 7:

Schnittdarstellungen anderer Bauformen der Zufuhrkörper

Embodiments according to the invention are described in more detail below by way of example with reference to the figures. Show it:

Fig. 1:

a top view of a nozzle arrangement according to the invention,

Fig. 2:

Cross-sectional representations of the designs of feed bodies,

Fig. 3:

3 shows a rear view of one of these designs of FIG. 2,

Fig. 4:

Sectional representations of a nozzle arrangement, and

5 - 7:

Sectional representations of other designs of the feed body

The following figures show solutions of a nozzle arrangement 7, in which the nozzle-shaped narrowing in the nozzle arrangement mainly takes place in a horizontal plane, as can best be seen in the supervision of FIGS. 1 and 2.

Since the height of the nozzle arrangements should be kept as low as possible in order to be as little visible behind the fuel or the flames, this results in a nozzle arrangement 7 which is considerably wider than it is high. As a result, the juxtaposition of a plurality of nozzles 40 within the nozzle arrangement 7 is necessary when the constriction is in a horizontal plane. The individual nozzles are formed by the distance between the two adjacent feed bodies 24, 25 which is reduced in the top view in the direction of flow of the flue gases from the primary exhaust 14 to the afterburner 13. These feed bodies, as they are shown in detail in different designs, for example in FIG. 2, have an outer contour that widens in the direction of flow, so that the individual nozzles 40 are formed in between by placing several such inflow bodies next to one another. The feed bodies 24, 25 thus have a preferably triangular or frustoconical cross-section when viewed from above, but semicircular or, for manufacturing reasons, circular cross-sections are also conceivable because of the use of simple or halved tubes.

In the designs shown in FIG. 2, the feed bodies 24 and 25 are each formed from an angularly curved, V-shaped front part, the base of which is closed by a base 28, that is to say a sheet-metal part welded or clamped there, as a result of which the cavity inside of the feed part is formed.

In the uppermost illustration in FIG. 2, this cavity, via which secondary air or the flue gases of the secondary exhaust are fed to the nozzle arrangement, has a plurality of outlet openings 26 in the rear part of the front plate, near the bottom 28, which are spaced in the longitudinal direction, which is also can act a more or less continuous slot along this floor. The free ends of the front part 27 protrude rearward over the base 28 and should thus protrude into the afterburning space 13 in order to bring about a particularly good swirling and mixing of the individual components there when the gas mixture flows in.

Compared to this uppermost design, in the middle design of FIG. 2, the cavity inside the feed body is additionally divided into two cavities not connected to one another by a partition wall 44 again consisting of sheet metal and welded or spread in the plane of symmetry of the feed body. As a result, secondary air on the one hand and flue gas on the other hand can be supplied from the secondary exhaust of the nozzle arrangement via each of the two separate cavities, with the feed body being otherwise identical.

The bottom representation of FIG. 2 shows a slightly different construction variant, the bottom 28 itself being again approximately U-shaped, but with a width slightly less than the width at the rear, open end of the V-shaped front part 27 two parts assembled so that the rear free ends of their legs end at approximately the same height, so there is a distance on both sides between the free end of the front part 27 and the free legs 28a, 28b of the bottom 28, which serves as an outlet opening 26 for the each gas to be supplied is used. The connection between the base part 28 and the front part 27 can be formed approximately in the area of the respective bend of the base 28 by a correspondingly thick weld point 41 in depth, of which a large number are spaced apart in the longitudinal direction, as in FIG. 3 in a rear view of the bottom feed body of FIG. 2 shown. This results in a large number of outlet openings 26 between the individual welding points 41, which bring about a good mixing of the gas flowing out here with the flue gases in the nozzle 40.

The angular position of the free legs 28a, 28b either exactly parallel to the angular position of the free legs of the front part 27 or approximately towards their end also causes whether the outlet openings 26 are designed as simple openings or as nozzle-shaped openings.

In order not to have to carry out further, too expensive sheet metal work for the individual feed bodies 24, 25 of a nozzle arrangement 7 holding the frame together, the very strong thermal expansion of these steel sheet parts which is effective in every direction playing a very disadvantageous role, these feed bodies 24, 25 in a frame 29 with corresponding recesses and passages, as shown in Figure 4, and preferably made of pourable, refractory material such as chamotte or fireproof concrete. This material has a much lower, almost negligible thermal expansion.

As shown in Fig. 4, - with alternating arrangement of supply bodies 24 and 25 for the supply of secondary air or flue gas from the secondary fume cupboard - the respective vertical supply bodies 24 and 25 with a supply line 24a or transversely supplying them 25a tightly connected for the supply of the respective gas, preferably by tightly but movably inserting the supply body into the respective supply line.

As can be seen in FIG. 4a, the respective supply line 24a, 25a lies longitudinally on the upper or lower cross leg of the frame 29 or in a recess prefabricated there. The supply bodies 24, 25 striving upwards or downwards from the supply line initially extend through correspondingly large passages 32 in this transverse leg of the frame 29 into the inner free space 45, which forms the actual nozzle arrangement 7, and reach it with its free one , generally closed end the opposite, lower or upper, cross leg of the frame 29. There the feed bodies 24, 25 protrude with their free ends into corresponding recesses 31, the cold ends of the feed bodies 24, 25 and the bottom of these depressions 31 remains at such a large distance that the longitudinal expansion of the feed body which occurs during heating can be easily absorbed.

Since the feed bodies also expand in thickness due to the thermal expansion, the passages 32 and stiffeners 31 are also larger in cross-sectional shape than the feed bodies in the cold state. Especially in the passages or depressions present in the lower leg of the frame 29, the particularly large cracks in the cold state along the circumference between the feed bodies and the surrounding frame 29 are covered by a kind of collar in the form of a collar 33. The collar 33 is usually also made of refractory steel sheet as the feed body, and may, but need not, be fixed to it. For example, such a collar can be placed loosely on the feed body, which greatly facilitates the assembly of the nozzle arrangement.

In order to further increase the effect of the nozzle arrangement 7, the nozzle-shaped narrowing, which is shown in the solution according to FIG. 4, above all in the horizontal plane as shown in FIG. 4b, can be caused by a further nozzle-shaped narrowing due to the upper and lower legs of the frame 29 can be supported in a vertical plane. For this purpose, the distance between the upper and lower legs of the frame 29 narrows, which as a rule begins at the depth, that is to say the width of FIG. 4c, in the flow direction of the flue gases in front of the feed body and usually ends only behind it in the area before as well as in the area after each other, whereby there is also a reduction in cross-section of the free space 45 of the frame 29 and thus of the nozzle arrangement 7 in the vertical direction.

The frame 29, as shown in FIGS. 4, is preferably cast in one piece. However, if the cuffs 33 are to be firmly connected to the feed bodies 24, 25 for manufacturing reasons, it is generally not possible to push the feed bodies through the one-piece frame 29 from above or below. In this case, the frame 29 is either made of two separate parts 29a, 29b, which touch in a vertical center plane, as shown in the right part of FIG. 1.

Another possibility is then to pass the passages 32 or depressions 31 e.g. to leave open towards the rear of the frame so that the feed bodies are only enclosed laterally and at the front by the frame 29, but not on their rear. This would allow insertion of the feed bodies 24 or 25 from the rear into the frame 29, as shown in the left-hand illustration of FIG. 1, best supported by a holder arranged on the rear of the feed.

Fig. 1 also shows on the right edge that - up to a certain width of the nozzle arrangement - it is also possible to supply only the flue gases from the secondary exhaust of the nozzle arrangement via the feed body 25, the secondary air 5, however, laterally, along the sides of the combustion chamber and through a corresponding passage 46 in the frame 29 at an angle into the nozzle arrangement or the subsequent afterburner 13.

5 shows a feed body consisting of a V-shaped front part 27 and a tube behind it. The flue gas recirculation 11 takes place, for example, in the cavity formed by the front part 27 and tube 48, and the Distance between the two parts is the outlet opening 26 for the flue gases of the return 11. Further outlet openings 26 'for the secondary air are openings in the cross section of the tube 48, just outside the part of the tube cross section 48 covered by the front part 27, but still inside the half of the tube cross section facing this front part 27.

In contrast, FIG. 6 shows a solution of the kind that is expedient when the nozzle arrangement 7 is positioned below the fuel 3, that is to say in the bottom of the combustion chamber 2:

Because on the roughly halved, round tube profiles 49 that form the front part, there is a large contact surface for the fuel, and especially in the upper area of the nozzle arrangement, the narrowing is greater than in the lower area, as a result of which fuel falls into the space between the Feed body and clogging of the nozzle assembly is kept relatively low.

On the side facing away from the combustion chamber 2, half a tubular profile 49 is in turn followed by a base 48 with a substantially U-shaped shape and free ends 28a, 28b which strive outwards at an angle. These free ends 28a, 28b protrude further into the nozzle 40 than half the tubular profile 49. Because of their position at an acute angle to the flow direction of the primary exhaust 14, they additionally act as a baffle plate and improve the mixing between the inflowing gas.

In this solution too - just as in the solution according to FIG. 5 - the size of the outlet openings 26 can be adjusted by changing the distance between the front part, in this case half the tubular profile 49, and the base 28. The adjustment is made by screwing one of the parts along a threaded rod that runs approximately on the line of symmetry of the feed body and is firmly connected to the other part.

Another somewhat different shape of the feed body, as can be used above all for vertical feed bodies, is shown in FIG. 7. The feed body is formed similar to the representations in Fig. 2, but with an additional floor 28 ', so that between the front part 27, first floor 28 and second floor 28' two separate feed spaces for secondary air and the flue gas of the first exhaust gas recirculation 11 are formed. Is also there compared to the center of the first floor 28, the distance between at least the second floor 28 ', but preferably also the front part 27, can be adjusted by screwing these parts along a threaded rod which is firmly connected to the first floor 28. Instead of a threaded rod, a lever linkage etc. can also be used, which above all gives the possibility of jointly adjusting a plurality of feed bodies, for example over the entire nozzle arrangement 7.

It is advantageous that the free legs 28a, 28b or 28'a, 28'b or 27a, 27b, which run essentially parallel or preferably towards the free end to each other at an acute angle, over a sufficient distance next to each other lie, whereby the corresponding outlet openings 26 are formed channel-like. Through this distance to be flowed through in the longitudinal direction of these channel-like configurations, the outflowing gases, i.e. the secondary air 5 or the flue gas of the first flue gas recirculation 11, are forced into a flow direction with which they flow into the flue gas of the primary exhaust 14 at an acute angle, and on account of their existing kinetic energy penetrate relatively far into the flow of the primary trigger 14, which causes thorough mixing.

A further improvement in the mixing results if the free legs 28'a, 28'b of the rearmost bottom 28 'protrude further outward than the corresponding free legs of the parts of the feed body 24 in front of them, since this free leg is inclined relative to the direction of flow of the primary trigger 14 this free end additionally acts as a kind of baffle, and causes an additional swirl at this point with mixing with the supplied gases.

REFERENCE SIGN LIST

1

Heater

2nd

Combustion chamber

3rd

fuel

4th

Primary air

5

Secondary air

6

Deduction

7

Nozzle arrangement

8th

Back wall

9

Control flap

10, 10 '

first separator

11

first exhaust gas recirculation

12th

second exhaust gas recirculation

13

Afterburner

14

Primary fume cupboard (bottom / rear)

15

Secondary deduction (relatively above)

16

Direct deduction

17th

Direct trigger flap

18th

Derivative

19th

Heat exchanger

20th

distance

20th

Passage

21

distance

21 '

Passage

22

door

23

Turbolator

24th

Feed body

25th

Feed body

26

Outlet opening

27

Front part

28

first floor

28 '

second floor

28a, 28b

free thighs

29

frame

30th

second separator

31

deepening

32

Passage

33

collar

34

cavity

35

cavity

36

Outside surface

37

increasing area

38

Baffle plate

39

cavity

40

jet

41

Weld

42

lever

43

Cable

44

partition wall

45

free space

46

Passage

47, 47 '

Outflow cross section

48

pipe

49

Half pipe profile

Claims (12)

Heater with - a combustion chamber (2) in which the fuel (3) is burned, - an afterburning chamber (13), into which the flue gases extracted from the combustion chamber (2) via the primary exhaust (14) are passed on via a nozzle arrangement for afterburning with the addition of secondary air,
characterized in that - The lines for the flue gas between the primary exhaust (14) of the combustion chamber (2) and the afterburner (13) over at least part of their length as a nozzle arrangement (7) are formed, in which the flow cross-section for the flue gases over at least part of this Distance measured in the horizontal and reduced the supply of secondary air and the flue gases of a first exhaust gas recirculation takes place in the area of the nozzle arrangement, - The nozzle arrangement (7) is much wider than higher, and - The individual nozzles are arranged by intermediate hollow bodies (24, 25) for secondary air (5) or for the first exhaust gas recirculation (11). Nozzle arrangement according to claim 1,
characterized in that
the feed bodies (24, 25) have an approximately triangular cross section, the base of which faces the afterburner (13) and the opposite tip of which faces the combustion chamber (2). Nozzle arrangement according to one of the preceding claims,
characterized in that
the feed bodies (24, 25) are divided into two separate cavities for the supply of secondary air (5) and first exhaust gas recirculation (11) in the plane of symmetry of their cross section. Nozzle arrangement according to one of the preceding claims,
characterized in that
in the case of the feed bodies (24, 25), the outlet openings (26) are arranged in the vicinity of the base of the triangular cross section, that is to say in the rear region of the feed bodies (24, 25). Nozzle arrangement according to one of the preceding claims,
characterized in that
the feed bodies (24, 25) protrude beyond the combustion-chamber-side boundary wall of the afterburning chamber (13) into the combustion chamber (13). Nozzle arrangement according to one of the preceding claims,
characterized in that
the feed body (24, 25) - a V-shaped front part (27), - A rear, the afterburner (13) facing first floor (28) with an approximately U-shaped cross-section, the free legs (28a, 28b) extend approximately in the direction of the free ends of the front part (27) and a second, analog floor (28 ') arranged behind it in the direction of the afterburning chamber (13), - With respect to the first, in the middle floor (28), the second floor (28 ') and / or the front part (27) are variable in their mutual distance. Heating device according to one of the preceding claims,
characterized in that
the free legs of the individual part of the feed body (24, 25) farthest from the combustion chamber (2) protrude further into the nozzle (40) of the nozzle arrangement (7) than the free leg of the other parts of the feed body (24, 25) and take an acute angle with respect to the flow direction of the nozzle (40) and thereby act as a baffle. Nozzle arrangement according to one of the preceding claims,
characterized in that
the feed bodies (24, 25) consist of high-temperature-resistant steel sheet, a V-shaped front part (27) through a rear floor (28) facing the afterburner (13), its free legs (28a, 28b) parallel and at a distance from the Free ends of the front part (27) run. Nozzle arrangement according to one of the preceding claims,
characterized in that
the nozzle arrangement (7) consists of a multiplicity of feed bodies (24, 25) which are arranged essentially vertically next to one another and which, viewed in the direction of flow of the nozzle arrangement, are arranged in a frame (29) and partially or completely penetrate the latter, and the frame (29) Solid body made of pourable, refractory material such as refractory concrete, SIC ceramic or chamotte. Nozzle arrangement according to one of the preceding claims,
characterized in that - The supply of secondary air (5) on the one hand and the first exhaust gas recirculation (11) on the other hand takes place from opposite sides (eg above or below) of the frame (29) and the corresponding supply lines (24a, 24b) in or on the upper or lower sides of the frame and - The feed body (24) or (25) with their respective supply lines (24a) or (25a) are tightly connected on one end and sealed on the other end. Nozzle arrangement according to one of the preceding claims,
characterized in that
the feed body (24, 25) on its side arranged with the corresponding supply line (24a) or (25a) the corresponding leg of the frame (29) completely penetrate through corresponding passages (32) and at the opposite free end in corresponding blind-hole-like depressions (31), with a comparatively large distance between the free end of the feed bodies (24, 25) and the end of the depression in the cold state (31) exists. Nozzle arrangement according to one of the preceding claims,
characterized in that
at least the passages (32) located in the lower leg of the frame (29) from the feed bodies (24) or (25), which are closed at the top and connected to a supply line (24a) or (25a) at the bottom, have a collar projecting outside the feed body (33), which covers the distance to the larger passage (32) or the recess (31).

Images