Flame protection device for a burner, projection sheet for such a flame protection device and drying drum with such a flame protection device

Abstract

A flame protection device for a burner (3), in particular in a drying drum (2), in particular in an asphalt plant, comprises a central longitudinal axis (7) and several deflector plates (11) which are arranged in the circumferential direction (10) with respect to the central longitudinal axis (7), wherein at least one lamella holder (19) for holding a lamella (9) is detachably attached to each of the deflector plates (11).

Description

[0001] The content of the German patent application DE 10 2022 211 109.5 is incorporated herein by reference.

[0002] The invention relates to a flame protection device for a burner, a throwing plate for such a flame protection device and a drying drum with such a flame protection device.

[0003] DE 10 2017 212 046 A1 discloses a plant for the production of asphalt. A flame tube is arranged in a drying drum to protect the burner flame. Additionally, a lamellar recuperator is arranged in the drying drum as part of a flow control unit, which serves for the targeted combustion of pollutant components in the exhaust gas and / or by-gases.

[0004] The invention is based on the objective of improving a combustion process in a drying drum and, in particular, carrying it out undisturbed.

[0005] The problem is solved by a flame protection device having the features of claim 1, by a throwing plate according to claim 8 and by a drying drum according to claim 10.

[0006] The core of the invention lies in the fact that, in a flame guard device, several deflector plates are arranged circumferentially with respect to a central longitudinal axis of the flame guard device. The deflector plates ensure efficient conveyance of the material to be dried within the drying drum. The flame guard device with the deflector plates is, in particular, arranged in a region of the drying drum where the burner flame is located. The deflector plates guarantee reliable material transport. Undesired contact between the material to be dried and the burner flame is specifically avoided. This prevents disruption of the combustion process and undesirable cooling due to flame disturbances. The efficiency of the combustion process is improved.The emission of unwanted exhaust gases, especially the proportion of unburned hydrocarbons (Ctotal), particularly carbon monoxide (CO) and / or carbon dioxide (CO2), is reduced. The process is improved both ecologically and economically. The combustion process is more sustainable.

[0007] Due to the improved material transport, the flame protection device, in particular the deflector plates, and / or the drying drum are thermally protected from the burner flame and especially from thermal radiation from the burner flame. The material cools the flame protection device.

[0008] The deflector plates are arranged circumferentially, particularly spaced apart from each other with respect to the central longitudinal axis. The deflector plates are attached, in particular, to an inner wall of the drying drum. A separate retaining element, which is attached directly to the inner wall of the drying drum, particularly by welding, serves to attach the deflector plates to the inner wall of the drying drum.

[0009] In particular, the inner wall of the drying drum is partially exposed between two circumferentially adjacent deflector plates. The deflector plates are oriented parallel to the central longitudinal axis.

[0010] Another finding stems from the fact that at least one, and in particular two, lamella holders are detachably attached to each of the deflector plates. Lamellae, as part of the flame protection device, can be attached to these holders. The lamellae enable a further improvement in the combustion process. Because the lamella holders, and thus the lamellae themselves, are detachably attached to the deflector plates, retrofitting the lamellae in the drying drum is simplified. It was specifically recognized that, due to the high thermal stress, the lamellae are wear parts with an average service life of less than one year. The detachable attachment simplifies lamella replacement, reduces maintenance time, and thus increases the overall efficiency of the system. Material usage for replacing worn lamellae is also reduced.

[0011] The deflectors are made of a heat-resistant material, in particular a heat-resistant structural steel designated according to DIN EN 10028-2 with the material number 1.5415 or with the material abbreviation 16Mo3. The deflectors are designed as sheet metal components and are produced from a flat sheet metal blank, particularly by bending. The sheet thickness s of the deflector is in particular between 5 mm and 10 mm, in particular between 7 mm and 9 mm, and in particular 8 mm.

[0012] The lamella holders are made of a heat-resistant material, in particular tenitic chromium-nickel steel, specifically material number 1.4841 according to DIN EN 10095. This material has a coefficient of thermal expansion α between 15 x 10⁻⁶ and 20 x 10⁻⁶, and in particular between 17 x 10⁻⁶ and 18 x 10⁻⁶, within a relevant temperature range of 300°C to 700°C, and especially within a range of 350°C to 650°C, 380°C to 620°C, and 400°C to 600°C. Other chromium-nickel steels are also possible, in particular with the material number 1.4828 or 1.4742, which is known under the trade name Sicromal 10.

[0013] The flame protection device is used for a burner that primarily generates an open flame. The burner can be operated with fossil fuels, particularly fossil energy carriers such as natural gas, liquefied petroleum gas (LPG), heating oil, and / or pulverized coal. Additionally or alternatively, the burner can be operated with renewable fuels such as wood pellets, wood dust, methane produced from biogas, and / or hydrogen gas.

[0014] The burner is primarily used to heat a drying drum, which is used in particular for heating material in an asphalt plant. The flame protection device in such a drying drum allows for an increased addition of recycled material, especially reclaimed asphalt granulate. This makes asphalt production more sustainable, as the amount of raw material used is reduced.

[0015] The drying drum ensures uncomplicated and robust installation in the drying drum.

[0016] A flame protection device according to claim 2 ensures improved material transport. The scoop-like deflectors have an L-shaped contour, particularly in a plane perpendicular to the central longitudinal axis. The deflectors are arranged on the inner wall of the drying drum, in particular such that a material receiving chamber is formed between the deflectors and the inner wall of the drying drum, enabling reliable material transport. In particular, the risk of an undesirable material film forming in the area of ​​the burner flame is reduced. In particular, such a material film is reliably prevented. The deflector is arranged on the inner wall of the drying drum by means of a, in particular short, web. This web forms a rear wall of the deflector and, with respect to the direction of rotation of the drying drum, forms a rear end of the deflector. The deflector is open opposite the rear wall.This opening serves primarily for receiving and / or discharging material to be dried, which is conveyed along the material conveying direction. The opening extends across the entire width of the discharge plate. This means that the discharge plate is designed without a front wall opposite the rear wall. It is conceivable, however, to design the discharge plate with a front wall that extends at least partially along the width of the discharge plate.

[0017] The material intake channel is designed to be open, particularly along the central longitudinal axis.

[0018] A flame-resistant device according to claim 3 enables flexible and reliable fastening of the deflector plates. Fastening strips each have an insertion slot. The insertion slot has a width that essentially corresponds to the thickness of the deflector plate. The slot width may be slightly smaller than the thickness of the deflector plate to improve clamping. The deflector plate is held in the fastening strips, in particular by positive locking and / or friction locking. The insertion slot extends, in particular, substantially along the circumferential direction. The deflector plates are each pushed onto at least one, and in particular several, fastening strips. The fastening strips are attached to the inner wall of the drying drum in such a way that the insertion slots are aligned along the central longitudinal axis.The mounting strips allow the throwing plates to be attached, in particular in a detachable manner and with variable adjustment regarding the angle of attack relative to the inner wall of the drying drum.

[0019] A flame protection device according to claim 4 simplifies the robust attachment of the louver holder to the deflector plate. In particular, the louver holder can advantageously be securely attached to a rear wall of the deflector plate using a screw connection. The louver holder extends, in particular, transversely and radially with respect to the central longitudinal axis. This simplifies the radially spaced mounting of the louvers relative to the deflector plates.

[0020] A flame protection device according to claim 5 enables the flexible and advantageous orientation of the louver holder with respect to the louver. In particular, the louver holder, which is preferably designed as a flat sheet metal blank, can be oriented transversely and especially perpendicular to the central longitudinal axis and detachably fastened to the deflector plate in this orientation. A retaining bracket is preferably L-shaped, especially as an angle profile with bores for a screw connection.

[0021] A flame protection device according to claim 6 enables the uncomplicated design of a material intake channel, which extends in particular along several deflector plates, especially those arranged one behind the other along the central longitudinal axis. The material intake channel enables reliable material conveying along the material conveying direction through the drying drum. The deflector plates are arranged in particular in alignment with each other with respect to the central longitudinal axis.

[0022] A cover element according to claim 7 prevents unintentional, particularly end-face, escape of the heated material from the material receiving channel. The material is discharged, in particular via the deflectors, to a material outlet from the drying drum. A cover element is attached, in particular, to the end face of the deflector, and is oriented, in particular, perpendicular to the central longitudinal axis. The cover element is, in particular, welded to the deflector.

[0023] A throwing plate according to claim 8 enables the advantages of the flame protection device itself.

[0024] A drying drum according to claim 9 enables the advantageous execution of the combustion process with increased efficiency and / or reduced exhaust emissions. In particular, the drying drum allows the use of higher proportions of recycled asphalt granulate in asphalt production. The replacement of worn lamellae by means of the lamella holders, which are detachably attached to the throwing plates, is simplified.

[0025] Both the features specified in the claims and those specified in the following exemplary embodiments of the flame protection device according to the invention are each suitable, individually or in combination with one another, for further developing the subject matter of the invention. The respective combinations of features do not constitute a limitation with regard to further developments of the subject matter of the invention, but are essentially merely exemplary.

[0026] Further advantageous embodiments, additional features and details of the invention will become apparent from the following description of an exemplary embodiment with reference to the drawing. The drawing shows: Fig. 1 a schematic sectional view of an arrangement with a burner attached to a drying drum and a flame protection device arranged in the drying drum according to the invention, Fig. 2 a longitudinal section through the drying drum according toFig. 1 , Fig. 3 a view of the drying drum according to arrow III in Fig. 1 , Fig. 4 an enlarged partial sectional view according to section line VV in Fig. 2 , Fig. 5 a perspective view of an end face of the drying drum according to Fig. 2 , Fig. 6 an enlarged detail view of detail VI in Fig. 5 Fig. 7 a different view of the drying drum according to Fig. 5 , Fig. 8 an enlarged detail view of detail VIII in Fig. 7 , Fig. 9 a perspective single view of a lamella according to Fig. 8 .

[0027] One in Fig. 1 The arrangement designated as a whole by 1 comprises a drying drum 2, on the end face of which a burner 3 is arranged. The arrangement 1 is in particular part of an asphalt plant in which asphalt material is produced.

[0028] In the drying drum 2, white minerals are heated in a countercurrent process. This means that the material flow direction 4 and the heat propagation direction 5 are oriented in opposite directions. The drying drum 2 can also be operated in a cocurrent process. In particular, other materials, especially rock and / or recycled asphalt, can also be heated in the drying drum 2.

[0029] The burner 3 generates a burner flame 6, which extends at least partially into the drying drum 2.

[0030] A flame guard is arranged in the drying drum 2, particularly in the area of ​​the burner flame 6. The flame guard has a central longitudinal axis 7 which coincides with a rotational axis 8 of the drying drum 2.

[0031] The flame guard has several louvers 9 arranged circumferentially 10 with respect to the central longitudinal axis 7. The louvers 9 ensure that thermally heated air remains within the circumferential arrangement 10 and does not unintentionally escape, particularly in a radial direction with respect to the central longitudinal axis 7. The louvers 9 prevent material heated in the drying drum 2 from unintentionally falling into the burner flame 6 and thus adversely affecting the combustion process.

[0032] The flame protection device comprises deflector plates 11. The deflector plates 11 are arranged concentrically with respect to the central longitudinal axis 7, in particular with respect to the lamellae 9 in the drying drum 2. The deflector plates 11 are located in the flame zone of the drying drum 2. When the drying drum 2 rotates, the deflector plates 11 allow the material to be carried along, i.e., material conveyed along the material conveyance direction 4. The deflector plates 11 are designed in such a way that a material film is prevented from forming in the drying drum 2 during material conveyance. This means that when the drying drum 2 rotates about the axis of rotation 8, the material is held radially in the deflector plates 11, and in particular, only axial material conveyance along the material conveyance direction 4 occurs.In particular, the throwing plates 11 reliably prevent the material from trickling down from top to bottom in the drying drum 2 due to gravity and forming a film of material.

[0033] By carrying the material in the throwing plates 11, both the throwing plates 11 themselves and the drying drum 2 are thermally protected from the burner flame 6 and / or the heat radiation emitted by the burner flame 6. This allows the material to cool the internal components and the drying drum 2.

[0034] The blade plates 11 are fitted with lamella holders 12, which serve to hold the lamellae 9. The lamella holders 12 are attached to the blade plates 11. The lamella holders 12 extend, in particular, perpendicular to the central longitudinal axis 7 and, in particular, radially.

[0035] The flame protection device includes a baffle 13. The baffle 13 is arranged axially spaced from the lamellae 9 along the central longitudinal axis 7. The baffle 13 is disc-shaped and, in particular, substantially circular, and is fastened in the drying drum 2 by at least one baffle mounting element 14. The baffle 13 prevents the burner flame 6 from unintentionally passing into a further deflector plate area of ​​the drying drum 2 located behind the baffle 13. A material curtain is deliberately generated in this further deflector plate area. The baffle 13 prevents material damage.

[0036] The following is based on Fig. 2 bis Fig. 9 The flame protection device is explained in more detail.

[0037] A circumferential arrangement of the louvers 9 comprises eighteen individual louvers 9. The louvers 9 are functionally identical and, in particular, have identical dimensions. Depending on the size to be formed, i.e., the clear width of the circumferential arrangement, more or fewer than eighteen louvers 9 can be used to form a circumferential arrangement.

[0038] Along the central longitudinal axis 7, four circumferential assemblies are arranged one behind the other according to the illustrated embodiment. More or fewer than four circumferential assemblies can also be arranged one behind the other. The individual circumferential assemblies are, in particular, identical in design. It is also conceivable that the circumferential assemblies have different diameters and / or are at least partially conical.

[0039] The louvers 9 each have a flame guard section 15 facing inwards, i.e., towards the burner flame 6. The flame guard section 15 has a rectangular contour with a length L and a width B. According to the illustrated embodiment, the length L of the louver 9 is greater than its width B. In particular, L ≥ 1.2 x B, in particular L ≥ 1.5 x B, in particular L ≥ 2.0 x B, in particular L ≥ 2.5 x B, and in particular L ≤ 10 x B. The louvers 9 are arranged side by side in the circumferential arrangement with respect to their longitudinal direction. In the circumferential arrangement, the louvers 9 are oriented with their longitudinal direction parallel to the central longitudinal axis 7. This means that a contour formed by the louvers 9 in a plane perpendicular to the central longitudinal axis 7 is constant along the central longitudinal axis 7.Because the flame protection sections 15 are designed to be flat, the circumferential arrangement in a plane perpendicular to the central longitudinal axis 7 has an inner contour that is essentially polygonal.

[0040] The lamellae 9 are made from material number 1.4841 from a sheet blank. The sheet thickness s is in particular in the range of 3 mm to 10 mm and especially between 5 mm and 7 mm.

[0041] The lamella 9 has sealing elements 16, 17 integrally molded onto its longitudinal edges. The sealing elements 16, 17 are designed as folded edges. The sealing elements 16, 17 are designed to correspond to each other.

[0042] The sealing elements 16, 17 form lateral sealing elements on the lamellae 9. The sealing elements 16, 17 form sealing strips. The sealing elements 16, 17 are designed such that the lamellae 9 are arranged alternately with the sealing elements 16, 17 in the circumferential order.

[0043] A first sealing element 16 essentially has an S-shaped contour. The S-contour extends, in particular, from the flame guard section 15 in a direction away from the burner flame 6. The first sealing element 16 forms a concave recess.

[0044] The second sealing element 17 has a contour corresponding to a rounded arrowhead. The second sealing element 17 forms a convexly shaped projection.

[0045] The convex outer contour of the second sealing element 17 corresponds to the concave inner contour of the first sealing element 16. In particular, the second sealing element 17 of a lamella 9 can be arranged on the first sealing element 16 of an adjacent lamella 9. This arrangement of adjacent lamellae 9 with the interlocking sealing elements 16, 17 is particularly advantageous in Fig. 4 and 6The corresponding sealing elements 16, 17 of adjacent lamellae 9 interlock, so that at most a thin air gap remains, which is in any case smaller than the sheet thickness s of the lamellae 9. In particular, the maximum gap width is at most 0.5 xs, in particular at most 0.3 xs, in particular at most 0.2 xs and in particular 0.1 x s.

[0046] This thin gap between the adjacent lamellae 9 forms a circumferential gap seal. As a result of the thermal expansion of the lamellae 9 during operation of the drying drum 2, the gap width continues to decrease.

[0047] Because the lamellae 9 of a circumferential arrangement interlock with their respective adjacent sealing elements 16, 17, the circumferential arrangement is self-supporting. This prevents the lamellae 9 from unintentionally separating from one another. The sealing elements 16, 17 ensure that the adjacent lamellae 9 interlock behind each other, making the circumferential arrangement stable in the radial direction with respect to the central longitudinal axis 7.

[0048] The lamellae 9 have a front flange 18 at a transverse edge oriented in the width direction. The front flange 18 is inclined downwards at an angle relative to the plane formed by the flame protection section 15. This angle of inclination is at most 30°, in particular at most 20°, in particular at most 15°, and in particular at most 10°. The flange 18 functions as an insertion tab, which can be inserted, in particular, into the circumferential arrangement positioned in front of it.

[0049] When several circumferential assemblies are arranged one behind the other along the central longitudinal axis 7, the lamellae 9 of the rearmost circumferential assembly are pushed under the respective lamella 9 of the circumferential assembly in front of it by means of the bend 18. This means that the bend 18 is located on the inner side of the circumferential assembly facing the burner flame 6. The bend 18 forms an axial gap seal between the circumferential assemblies arranged one behind the other along the central longitudinal axis 7. The circumferential assemblies have a high degree of tightness.

[0050] The lamellae 9 arranged one behind the other along the central longitudinal axis 7 are aligned.

[0051] Each lamella 9 is held by at least one lamella holder 19, and according to the illustrated embodiment, by two lamella holders 19. The lamella holder 19 is made from a flat sheet metal blank and has, in particular, a strip-like contour. The lamella holder 19 is, in particular, made of the same material as the lamella 9. The sheet thickness of the lamella holder is, in particular, between 8 mm and 15 mm, and, in particular, between 10 mm and 12 mm.

[0052] According to the illustrated embodiment, the louver holder 19 has projections, in particular two retaining pins, which are arranged, in particular, on its end face. The retaining pins can engage in recesses 20, which are arranged on the flame-resistant section 15. The recesses 20 are, in particular, designed as punched holes. The louver 9 is, in particular, supported or placed on the louver holder 19. The recesses 20 serve as an assembly aid for the louver holder 19 of the louver 9. In particular, the louver 9 is detachably attached to the louver holder 19. This simplifies the assembly of the circumferential arrangement. Additionally or alternatively, the louver holders 19 can also be permanently attached to the louver 9, in particular by welding.

[0053] At least one lamella 31 in each circumferential arrangement is designed differently with respect to the recesses 20. This lamella is referred to as the end lamella 31. Accordingly, the associated end lamella holders 32 for the end lamella 31 do not have protruding retaining pins, but rather a bent support tab 21, which is particularly Fig. 5 is shown.

[0054] The circumferential arrangement is formed by arranging lamellae 9 adjacent to one another in a circumferential direction 10 and placing them on the respective lamella holders 19. The lamellae 19 are stabilized on the one hand by the interlocking sealing elements 16, 17 and on the other hand by the engagement of the retaining pins in the recesses 20. The end lamella 31 is inserted axially, i.e., in a direction parallel to the central longitudinal axis 7, and engages with the two adjacent lamellae 9. The sealing elements 16, 17 ensure an undercut in the radial direction between adjacent lamellae 9 and 9, 31. The last lamella 31 to be installed is attached to the support lugs 21, in particular by welding.

[0055] By using the lamella holders 19, the lamellae 9 can be arranged in the drying drum 2 at a radial distance from an inner wall 22. The lamellae 9 form an assembly spaced from the inner wall 22 and aligned concentrically with the central longitudinal axis 7. The circumferential arrangement is essentially ring-shaped with a polygonal inner contour. The circumferential arrangement is rigidly connected to the drying drum 2. When the drying drum 2 rotates, the circumferential arrangement rotates with it.

[0056] With respect to the lamellae 9, the deflecting plates 11 are arranged radially outwards in the radial direction with respect to the axis of rotation 8. In particular, the deflecting plates 11 are arranged on the inner wall 22 of the drying drum 2.

[0057] For this purpose, retaining tabs 23 can be attached directly to the inner wall 22, in particular by welding. A mounting strip 24 is detachably attached to each of the retaining tabs 23, in particular by screwing. In particular, each throwing plate 11 is held by several, in particular three, mounting strips 24, wherein the mounting strips 24 are identical and arranged at intervals from each other along the central longitudinal axis 7.

[0058] The mounting strips 24 each have a slot-shaped receptacle 25 into which the throwing plates 11 are inserted.

[0059] The throwing plate 11 is designed in a scoop-like shape and has an L-shaped contour in a plane oriented perpendicular to the central longitudinal axis 7. The throwing plate 11 is arranged on the inner wall 22 of the drying drum 2 such that the short rib of the "L" extends substantially parallel to the inner wall 22 of the drying drum 2. "Substantially" means that the throwing plate 11 has no curvature at the inner wall 22 of the drying drum 2. To increase rigidity, the throwing plate 11 can be designed with bends. A material receiving chamber is formed between the throwing plate 11 and the inner wall 22 of the drying drum 2, which has an open rectangular contour in a plane perpendicular to the central longitudinal axis 7. The rectangle is open on one side opposite the short rib of the "L". The material receiving chamber is also open along the central longitudinal axis 7.It is possible that these end faces of the material receiving chamber are closed by separate cover elements 26. In particular, the end face of the material receiving chamber facing the material outlet of the drying drum 2 is closed by the cover element 26. The cover element 26 is attached to the discharge plate 11, in particular by welding.

[0060] The throwing plates 11, arranged one behind the other along the central longitudinal axis 7, are arranged continuously relative to each other, i.e., abutting each other at their end faces. The throwing plates 11 form the material receiving channel, which extends over several throwing plates 11.

[0061] The design of the throwing plates 11 ensures that the material to be heated is reliably carried along in the drying drum 2, but no material film is formed in the area of ​​the lamellae 9.

[0062] The short section of the "L" forms a rear wall 27 of the throwing plate 11. The lamella holders 19 of the lamellae 9 are detachably attached to the rear wall 27. According to the illustrated embodiment, a retaining bracket 28, which is preferably designed as an L-profile and allows for screwing together sheet metal sections oriented at 90° to each other, serves this purpose.

[0063] A particular advantage is that the louver holders 19 are detachably attached to the deflector plates 11. Retrofitting the louver holders 19 and / or the louvers 9 held by them is simplified. In particular, it is not necessary to attach the louvers 9 to the inner wall itself using the louver holders 19. The assembly and disassembly effort is reduced.

[0064] In particular, at least one deflector plate 11 is provided for each lamella 9. Corresponding lamellae 9 and deflector plates 11 are arranged in alignment in the radial direction with respect to the central longitudinal axis 7.

[0065] According to the illustrated embodiment, in addition to the four deflector plate arrangements, which are arranged concentrically to the respective circumferential arrangements of the lamellae 9, two further rows of deflector plates 11 are provided. No lamellae 9 are attached to these deflector plates 11. These deflector plates are therefore arranged freely.

[0066] The impact wall 13 is arranged axially spaced from the lamellae 9, and is particularly important in Fig. 3The impact wall 13 is made up of several identical impact wall segments 29, three in the illustrated embodiment. Each impact wall segment 29 has a disc section and an impact wall mounting element 14 integrally attached to it. The disc sections are each designed as a third-circle disc, i.e., with an opening angle of 120° with respect to the central longitudinal axis 7. To connect the impact wall segments 29, flange strips are bent onto the parallel wall segments 29 and bolted together. The impact wall segments 29 are attached to corresponding deflector plates 11 by means of the impact wall mounting elements 14 and a retaining tab 30 provided for this purpose.

Claims

1. Flame protection device for a burner (3), in particular in a drying drum (2), in particular of an asphalt plant, wherein the flame protection device has a central longitudinal axis (7) and a plurality of throwing plates (11) which are arranged in the circumferential direction (10) with respect to the central longitudinal axis (7), wherein at least one lamella holder (19) for holding a lamella (9) is detachably fastened to each of the throwing plates (11).

2. Flame protection device according to claim 1, characterized in that the throwing plates (11) are arranged in a shovel-like manner.

3. Flame protection device according to one of the preceding claims, characterized in that at least one fastening strip (24) is attached to each throwing plate (11), which serves to fasten the throwing plate (11), in particular to an inner wall (22) of the drying drum (2).

4. Flame protection device according to one of the preceding claims, characterized in thatthe at least one slat holder (19) is detachably fastened to a rear wall (27) of the throwing plate (11), wherein the rear wall (27) extends in particular transversely to the inner wall (22) of the drying drum (2) and is arranged in particular in a plane containing the central longitudinal axis (7).

5. Flame protection device according to claim 4, characterized in that the at least one slat holder (19) is fastened to the rear wall (27) by means of a holding bracket (28).

6. Flame protection device according to one of the preceding claims, characterized in that several throwing plates (11) are arranged one behind the other along the central longitudinal axis (7), in particular in alignment.

7. Flame protection device according to one of the preceding claims, characterized in that a cover element (26) is attached to the front side of a throwing plate (11).

8. Throwing plate for a flame protection device according to one of the preceding claims.

9. Drying drum with a flame protection device according to one of the preceding claims.

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