EP4357524A1 - Flame protection device for a burner, flight for such a flame protection device and drying drum with such a flame protection device - Google Patents

Flame protection device for a burner, flight for such a flame protection device and drying drum with such a flame protection device Download PDF

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Publication number
EP4357524A1
EP4357524A1 EP23202571.8A EP23202571A EP4357524A1 EP 4357524 A1 EP4357524 A1 EP 4357524A1 EP 23202571 A EP23202571 A EP 23202571A EP 4357524 A1 EP4357524 A1 EP 4357524A1
Authority
EP
European Patent Office
Prior art keywords
protection device
flame protection
drying drum
throwing
longitudinal axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23202571.8A
Other languages
German (de)
French (fr)
Inventor
Jörg Genetsch
Matthias Walter Johann
Ramón Licht
Stephan Zimmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies GmbH
Original Assignee
Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies GmbH filed Critical Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies GmbH
Publication of EP4357524A1 publication Critical patent/EP4357524A1/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06Chambers, containers, or receptacles
    • F26B25/14Chambers, containers, receptacles of simple construction
    • F26B25/16Chambers, containers, receptacles of simple construction mainly closed, e.g. drum
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/028Arrangements for the supply or exhaust of gaseous drying medium for direct heat transfer, e.g. perforated tubes, annular passages, burner arrangements, dust separation, combined direct and indirect heating
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/05Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23MCASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00Baffles or deflectors for air or combustion products; Flame shields
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00Heating arrangements
    • F26B23/02Heating arrangements using combustion heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06Chambers, containers, or receptacles
    • F26B25/08Parts thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/02Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried

Definitions

  • 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.
  • EN 10 2017 212 046 A1 discloses a plant for producing asphalt.
  • a flame tube is arranged in a drying drum to protect the burner flame.
  • a lamella 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 in secondary exhaust gases.
  • the invention is based on the object of improving a combustion process in a drying drum and, in particular, of carrying it out undisturbed.
  • the object is achieved 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.
  • the essence of the invention is that in a flame protection device several throwing plates are arranged in the circumferential direction with respect to a central longitudinal axis the flame protection device.
  • the throwing plates guarantee advantageous conveyance of the material to be dried in the drying drum.
  • the flame protection device with the throwing plates is arranged in particular in an area of the drying drum in which a burner flame of the burner is arranged.
  • the throwing plates guarantee reliable transport of the material. Undesirable contact of the material to be dried with the burner flame is avoided in particular. This can prevent disruption of the combustion process and undesirable cooling as a result of disruption of the flame.
  • the efficiency of the combustion process is improved.
  • the emission of undesirable exhaust gases in particular the proportion of unburned hydrocarbons (C total ), in particular carbon monoxide (CO) and/or carbon dioxide (CO 2 ) is reduced.
  • the process is ecologically and economically improved.
  • the combustion process is more sustainable.
  • the flame protection device in particular the throwing plates, and/or the drying drum are thermally protected from the burner flame and in particular from thermal radiation from the burner flame.
  • the material cools the flame protection device.
  • the throwing plates are arranged in particular at a distance from one another in the circumferential direction with respect to the central longitudinal axis.
  • the throwing plates are in particular attached to an inner wall of the drying drum.
  • a separate holding element is used in particular to attach the throwing plates to the inner wall of the drying drum, which is in particular directly attached, in particular welded, to the inner wall of the drying drum.
  • the inner wall of the drying drum is partially exposed between two throwing plates arranged adjacent to each other in the circumferential direction.
  • the throwing plates are oriented in particular parallel to the central longitudinal axis.
  • At least one lamella holder and in particular two lamella holders are detachably attached to the throwing plates.
  • Slats can be attached to the lamella holders as part of the flame protection device.
  • the lamellas enable an additional improvement of the combustion process.
  • the fact that the lamella holders and thus the lamellas are detachably attached to the throwing plates makes it easier to retrofit the lamellas in the drying drum.
  • the lamellas are wearing parts with an average service life of less than a year due to the high thermal load.
  • the detachable attachment makes it easier to replace the lamellas. Maintenance times are reduced. The overall efficiency of the system is therefore increased. The material used to replace worn lamellas is reduced.
  • the throwing plates are made of a heat-resistant material, in particular of a heat-resistant structural steel, which is designated according to DIN EN 10028-2 with the material number 1.5415 or with the material abbreviation 16Mo3.
  • the throwing plates are in particular each designed as sheet metal components and in particular each made from a flat sheet metal cut, in particular by bending.
  • the sheet thickness s of the throwing plate is in particular between 5 mm and 10 mm, in particular between 7 mm and 9 mm and in particular 8 mm.
  • the slat holders are made of a heat-resistant material, in particular of a tenitic chromium-nickel steel, in particular with the material number 1.4841 according to DIN EN 10095.
  • This material has a thermal expansion coefficient ⁇ between 15 ⁇ 10- 6 and 20 ⁇ 10- 6 , in particular 17 ⁇ 10- 6 and 18 ⁇ 10- 6 , in a relevant temperature range of 300°C to 700°C and in particular in a range of 350°C to 650°C, in particular in a range of 380°C to 620° C and in particular in a range of 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.
  • the flame protection device is used for a burner, which in particular generates an open burner flame.
  • the burner can be operated with fossil fuels, in particular fossil energy sources such as natural gas, liquid gas, heating oil and/or coal dust. Additionally or alternatively, the burner can be operated with renewable fuels such as wood pellets, wood dust, methane generated from biogas and/or hydrogen gas.
  • the burner is used in particular to heat a drying drum, which is used in particular to heat material in an asphalt plant.
  • the flame protection device in such a drying drum enables an increased addition of recycled material, in particular old asphalt granulate.
  • the production of asphalt is therefore more sustainable because the use of raw materials is reduced.
  • the drying drum ensures uncomplicated and robust installation in the drying drum.
  • a flame protection device ensures improved material transport.
  • the shovel-like throwing plates have an L-shaped contour, in particular in a plane perpendicular to the central longitudinal axis.
  • the throwing plates are arranged on the inner wall of the drying drum in such a way that a material receiving chamber is formed between the throwing plates and the inner wall of the drying drum, which enables reliable material entrainment. In particular, the risk of an undesirable material veil forming in the area of the burner flame is reduced. In particular, such a material veil is reliably prevented.
  • the throwing plate is arranged on the inner wall of the drying drum with a, in particular short, web. This web forms a rear wall of the throwing plate and forms a rear end of the throwing plate in relation to the direction of rotation of the drying drum.
  • the throwing plate is open opposite the rear wall. This opening is used in particular to receive and/or release material to be dried, which is conveyed along the material conveying direction.
  • the opening extends in particular along the entire width of the throwing plate. This means that the throwing plate is designed without a front wall opposite the rear wall. It is conceivable to design the throwing plate with a front wall that extends at least partially along the width of the throwing plate.
  • the material intake channel is designed to be open, particularly along the central longitudinal axis.
  • a flame protection device enables flexible and reliable fastening of the throwing plates.
  • Fastening strips in particular each have an insertion slot.
  • the insertion slot has a slot width that essentially corresponds to the sheet thickness of the throwing plate.
  • the slot width can be slightly smaller than the sheet thickness of the throwing plate in order to improve fastening by clamping.
  • the throwing plate is held in the fastening strips in particular in a form-fitting and/or force-fitting manner.
  • the insertion slot extends in particular essentially along the circumferential direction.
  • the throwing plates are each pushed into at least one and in particular into several fastening strips.
  • the fastening strips are in particular fastened to the inner wall of the drying drum in such a way that the insertion slots are arranged in alignment along the central longitudinal axis.
  • the fastening strips make it possible to fasten the throwing plates, in particular detachably and variably with regard to the angle of attack relative to the inner wall of the drying drum.
  • a flame protection device simplifies a robust fastening of the slat holder to the throwing plate.
  • the slat holder can advantageously be securely fastened to a rear wall of the throwing plate using a screw connection.
  • the slat holder extends in particular in a transverse direction and in particular radially with respect to the central longitudinal axis. The radially spaced attachment of the slats with respect to the throwing plates is thereby simplified.
  • a flame protection device enables the flexible and advantageous orientation of the slat holder with respect to the slat.
  • the slat holder which is designed in particular as a flat sheet metal cut, can be oriented transversely and in particular perpendicularly to the central longitudinal axis and can be detachably attached to the throwing plate in this orientation.
  • a bracket is particularly L-shaped, in particular as an angle profile with holes for a screw connection.
  • a flame protection device enables an uncomplicated formation of a material receiving channel which extends in particular along several throwing plates, in particular arranged one behind the other along the central longitudinal axis.
  • the material receiving channel enables reliable material conveyance along the material conveying direction through the drying drum.
  • the throwing plates are arranged in particular in alignment with one another with respect to the central longitudinal axis.
  • a cover element according to claim 7 prevents the heated material from accidentally escaping from the material receiving channel, in particular from the front.
  • the material is released in particular via the throwing plates to a material outlet from the drying drum.
  • a cover element is attached in particular to the front of the throwing plate, in particular oriented perpendicular to the central longitudinal axis.
  • the cover element is in particular welded to the throwing plate.
  • a throwing plate according to claim 8 enables the advantages of the flame protection device itself.
  • a drying drum according to claim 9 enables the advantageous implementation of the combustion process with increased efficiency and/or reduced exhaust emissions.
  • the drying drum enables the use of increased amounts of old asphalt granulate in asphalt production.
  • the replacement of worn lamellae is simplified by means of the lamella holders detachably attached to the throwing plates.
  • the arrangement designated as a whole by 1, comprises a drying drum 2, on the front of which a burner 3 is arranged.
  • the arrangement 1 is in particular part of an asphalt plant in which asphalt material is produced.
  • white mineral in particular is heated in a countercurrent process.
  • a material flow direction 4 and a heat propagation direction 5 are oriented opposite to one another.
  • the drying drum 2 can also be operated in a cocurrent process.
  • other materials in particular rock and/or old asphalt material, can also be heated in the drying drum 2.
  • the burner 3 generates a burner flame 6 which extends at least partially into the drying drum 2.
  • a flame protection device is arranged in the drying drum 2, in particular in the area of the burner flame 6.
  • the flame protection device has a central longitudinal axis 7 which coincides with an axis of rotation 8 of the drying drum 2.
  • the flame protection device has several lamellae 9, which are arranged in the circumferential direction 10 with respect to the central longitudinal axis 7.
  • the Slats 9 ensure that thermally heated air remains within the peripheral arrangement 10 and does not inadvertently flow outwards, in particular in a radial direction relative to the central longitudinal axis 7.
  • the slats 9 prevent material heated in the drying drum 2 from inadvertently falling into the burner flame 6 and thus adversely affecting the burning process.
  • the flame protection device has throwing plates 11.
  • the throwing plates 11 are arranged concentrically with respect to the central longitudinal axis 7, in particular with respect to the slats 9 in the drying drum 2.
  • the throwing plates 11 are arranged in the flame area of the drying drum 2.
  • the throwing plates 11 enable the material to be dried to be entrained, i.e. material to be conveyed along the material conveying direction 4.
  • the throwing plates 11 are designed in particular in such a way that a material veil in the drying drum 2 is prevented when the material is entrained. This means that when the drying drum 2 rotates about the axis of rotation 8, the material is held in the throwing plates 11 in the radial direction and in particular only an axial material conveyance takes place along the material conveying direction 4.
  • 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 material veil.
  • 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. As a result, the material cools the internals and the drying drum 2.
  • Slat holders 12 are attached to the throwing plates 11 and serve to hold the slats 9.
  • the slat holders 12 are attached to the throwing plates 11.
  • the slat holders 12 extend in particular perpendicular to the central longitudinal axis 7 and in particular radially.
  • the flame protection device has a baffle 13.
  • the baffle 13 is arranged along the central longitudinal axis 7 at an axial distance from the slats 9.
  • the baffle 13 is disk-like and in particular essentially circular and is fastened in the drying drum 2 with at least one baffle fastening element 14.
  • the baffle 13 prevents the burner flame 6 from accidentally breaking through into another throwing plate area of the drying drum 2 arranged behind the baffle 13. A material veil is deliberately created in this other throwing plate area.
  • the baffle 13 prevents material damage.
  • a circumferential arrangement of the slats 9 comprises eighteen individual slats 9.
  • the slats 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 slats 9 can be used to form a circumferential arrangement.
  • circumferential arrangements are arranged one behind the other along the central longitudinal axis 7. More or less than four circumferential orders can be arranged one behind the other.
  • the individual circumferential arrangements are in particular designed identically. It is also conceivable that the circumferential arrangements have different diameters and/or are designed conically at least in sections.
  • the slats 9 each have a flame protection section 15 facing inwards, i.e. towards the burner flame 6.
  • the flame protection section 15 has a rectangular contour with a length L and a width B.
  • the length L of the slat 9 is greater than its width B.
  • the slats 9 are arranged next to one another in the circumferential arrangement with respect to their longitudinal direction. In the circumferential arrangement, the slats 9 are oriented with their longitudinal direction parallel to the central longitudinal axis 7.
  • a contour formed by the slats 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 flat, the peripheral arrangement has an inner contour in a plane perpendicular to the central longitudinal axis 7 which is essentially polygonal.
  • the slats 9 are made from a sheet metal blank made of material with the number 1.4841.
  • the sheet thickness s is in particular in a range from 3 mm to 10 mm and in particular between 5 mm and 7 mm.
  • the slat 9 has sealing elements 16, 17 formed in one piece on its longitudinal edges.
  • the sealing elements 16, 17 are designed as bevels.
  • the sealing elements 16, 17 are designed to correspond to one another.
  • the sealing elements 16, 17 form lateral sealing elements on the slats 9.
  • the sealing elements 16, 17 form sealing strips.
  • the sealing elements 16, 17 are designed such that the slats 9 are arranged alternately with the sealing elements 16, 17 in the circumferential order.
  • a first sealing element 16 essentially has an S-contour.
  • the S-contour extends in particular from the flame protection section 15 in a direction facing away from the burner flame 6.
  • the first sealing element 16 forms a concave receptacle.
  • the second sealing element 17 has a contour that corresponds to a rounded arrowhead.
  • the second sealing element 17 forms a convex-shaped projection.
  • the convex outer contour of the second sealing element 17 corresponds to the concave inner contour of the first sealing element 16.
  • 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 lamellas 9 with the sealing elements 16, 17 arranged one inside the other is particularly Fig.4 and 6
  • Corresponding sealing elements 16, 17 of adjacent lamellae 9 engage with one another, so that at most a thin air gap remains, which is in any case smaller than the sheet thickness s of the lamellae 9.
  • 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.
  • the circumferential arrangement engages with the adjacent sealing elements 16, 17, the circumferential arrangement is designed to be self-supporting.
  • the lamellae 9 are prevented from accidentally separating from one another.
  • the sealing elements 16, 17 engage behind one another in such a way that the circumferential arrangement is designed to be stable in the radial direction relative to the central longitudinal axis 7.
  • the slats 9 have a front bevel 18 on a transverse edge that is oriented in the width direction.
  • the front bevel 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 bevel 18 functions as an insertion tab that can be inserted in particular into the peripheral arrangement arranged in front of it.
  • the slats 9 arranged one behind the other along the central longitudinal axis 7 are aligned.
  • Each slat 9 is held by at least one slat holder 19 and, according to the embodiment shown, by two slat holders 19.
  • the slat holder 19 is made from a flat sheet metal blank and in particular has a strip-like contour.
  • the slat holder 19 is in particular made from the same material as the slat 9.
  • the sheet metal thickness of the slat holder is in particular between 8 mm and 15 mm and in particular between 10 mm and 12 mm.
  • the slat holder 19 has projections, in particular two retaining pins, which are arranged in particular on the front side.
  • the retaining pins can engage in recesses 20 which are arranged on the flame protection section 15.
  • the recesses 20 are designed in particular as punched-through holes.
  • the slat 9 is in particular supported or placed on the slat holder 19.
  • the recesses 20 serve as an assembly aid for the slat holder 19 of the slat 9.
  • the slat 9 is detachably attached to the slat holder 19.
  • the assembly of the peripheral arrangement is thereby simplified.
  • the slat holders 19 can also be permanently attached to the slat 9, in particular welded on.
  • At least one lamella 31 per circumferential arrangement is designed differently with respect to the recesses 20.
  • This lamella is referred to as the end lamella 31.
  • the associated end lamella holders 32 for the end lamella 31 do not have any protruding retaining pins, but rather a bent support tab 21, which is particularly in Fig.5 is shown.
  • the circumferential arrangement is formed by arranging slats 9 in a row adjacent to one another in the circumferential direction 10 and placing them on the respective slat holders 19.
  • the slats 19 are stabilized by the interlocking sealing elements 16, 17 on the one hand and by the engagement of the retaining pins in the recesses 20 on the other.
  • the final slat, the closing slat 31, is inserted axially, i.e. in a direction parallel to the central longitudinal axis 7, and in doing so comes into engagement with the two adjacent slats 9.
  • the sealing elements 16, 17 ensure an undercut in the radial direction between adjacent slats 9 and 9, 31.
  • the last-mounted closing slat 31 is attached to the support tabs 21, in particular welded.
  • the slats 9 By using the slat holders 19, it is possible for the slats 9 to be arranged in the drying drum 2 at a radial distance from an inner wall 22 of the drying drum 2.
  • the slats 9 form an installation that is arranged at a distance from the inner wall 22 and is aligned concentrically to the central longitudinal axis 7.
  • the peripheral arrangement is essentially ring-shaped with the polygonal inner contour.
  • the peripheral arrangement is firmly connected to the drying drum 2. When the drying drum 2 rotates, the peripheral arrangement rotates with it.
  • the throwing plates 11 are arranged offset radially outwards in the radial direction relative to the axis of rotation 8.
  • the throwing plates 11 are arranged on the inner wall 22 of the drying drum 2.
  • retaining tabs 23 can be attached, in particular welded, directly to the inner wall 22.
  • a fastening strip 24 is detachably attached, in particular screwed, to each of the retaining tabs 23.
  • each throwing plate 11 is held by several, in particular three, fastening strips 24, the fastening strips 24 being identical and arranged at a distance from one another along the central longitudinal axis 7.
  • the fastening strips 24 each have a slot-shaped receptacle 25 into which the throwing plates 11 are inserted.
  • the throwing plate 11 is designed like a shovel 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 in such a way that the short web of the "L" extends essentially parallel to the inner wall 22 of the drying drum 2. Essentially means that the throwing plate 11 has no curvature on the inner wall 22 of the drying drum 2.
  • the throwing plate 11 can be designed with bevels.
  • 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 a side opposite the short web of the "L".
  • the material receiving chamber is also open in particular along the central longitudinal axis 7. It is possible, that these front sides of the material receiving chamber are closed by separate cover elements 26. In particular, the front side 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 throwing plate 11, in particular welded thereto.
  • the throwing plates 11 arranged one behind the other along the central longitudinal axis 7 are arranged in a continuous manner to one another, i.e. they abut one another at the front.
  • the throwing plates 11 form the material receiving channel extending over several throwing plates 11.
  • 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 veil is formed in the area of the slats 9.
  • the short web of the "L” forms a rear wall 27 of the throwing plate 11.
  • the slat holders 19 of the slats 9 are detachably attached to the rear wall 27.
  • a holding bracket 28 is used for this purpose, which is designed in particular as an L-profile and enables sheet metal sections oriented at 90° to one another to be screwed together.
  • the slat holders 19 are detachably attached to the throwing plates 11. Retrofitting the slat holders 19 and/or the slats 9 held thereon is simplified. In particular, it is not necessary for the slats 9 to be attached to the inner wall itself using the slat holders 19. The assembly and disassembly effort is reduced.
  • each lamella 9 there is at least one throwing plate 11 for each lamella 9.
  • Corresponding lamellas 9 and throwing plates 11 are arranged in alignment in the radial direction with respect to the central longitudinal axis 7.
  • the baffle wall 13 is arranged axially spaced from the slats 9, which is particularly Fig.3 is shown.
  • the impact wall 13 is made up of several identical impact wall segments 29, three according to the embodiment shown.
  • the impact wall segments 29 each have a disk section and a one-piece impact wall fastening element 14 attached to it.
  • the disk sections are each designed like a third of a circular disk, i.e. with an opening angle of 120° in relation to the central longitudinal axis 7.
  • flange strips are bent on the parallel wall segments 29 and screwed together.
  • the impact wall segments 29 are attached to corresponding throwing plates 11 by means of the impact wall fastening elements 14 and by means of a retaining tab 30 provided for this purpose.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Development (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Eine Flammenschutzvorrichtung für einen Brenner (3), insbesondere in einer Trockentrommel (2), insbesondere einer Asphaltanlage, umfasst eine Mittellängsachse (7) und mehrere Wurfbleche (11), die in Umfangsrichtung (10) bezüglich der Mittellängsachse (7) angeordnet sind, wobei an den Wurfblechen (11) jeweils mindestens ein Lamellenhalter (19) zum Halten einer Lamelle (9) lösbar befestigt ist.A flame protection device for a burner (3), in particular in a drying drum (2), in particular of an asphalt plant, comprises 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 the throwing plates (11).

Description

Der Inhalt der deutschen Patentanmeldung DE 10 2022 211 109.5 wird durch Bezugnahme hierin aufgenommen.The content of the German patent application EN 10 2022 211 109.5 is incorporated herein by reference.

Die Erfindung betrifft eine Flammenschutzvorrichtung für einen Brenner, ein Wurfblech für eine derartige Flammenschutzvorrichtung sowie eine Trockentrommel mit einer derartigen Flammenschutzvorrichtung.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.

DE 10 2017 212 046 A1 offenbart eine Anlage zum Herstellen von Asphalt. In einer Trockentrommel ist ein Flammrohr zum Schutz der Brennerflamme angeordnet. Zusätzlich ist in der Trockentrommel eine Lamellenrekuperator als Teil einer Strömungsleiteinheit angeordnet, der zum gezielten Verbrennen von Schadstoffanteilen im Abgas und/oder in Nebenabgasen dient. EN 10 2017 212 046 A1 discloses a plant for producing asphalt. A flame tube is arranged in a drying drum to protect the burner flame. In addition, a lamella 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 in secondary exhaust gases.

Der Erfindung liegt die Aufgabe zugrunde, einen Verbrennungsvorgang in einer Trockentrommel verbessern und insbesondere ungestört durchzuführen.The invention is based on the object of improving a combustion process in a drying drum and, in particular, of carrying it out undisturbed.

Die Aufgabe wird durch eine Flammenschutzvorrichtung mit den Merkmalen des Anspruchs 1, durch ein Wurfblech gemäß Anspruch 8 und durch eine Trockentrommel gemäß Anspruch 10 gelöst.The object is achieved 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.

Der Kern der Erfindung besteht darin, dass bei einer Flammenschutzvorrichtung mehrere Wurfbleche in Umfangsrichtung bezüglich einer Mittellängsachse der Flammenschutzvorrichtung angeordnet sind. Die Wurfbleche garantieren eine vorteilhafte Förderung des zu trocknenden Materials in der Trockentrommel. Die Flammenschutzvorrichtung mit den Wurfblechen ist insbesondere in einem Bereich der Trockentrommel angeordnet, in dem eine Brennerflamme des Brenners angeordnet ist. Die Wurfbleche garantieren einen zuverlässigen Transport des Materials. Ein unerwünschter Kontakt des zu trocknenden Materials mit der Brennerflamme wird insbesondere vermieden. Dadurch kann eine Störung des Verbrennungsprozesses und ein unerwünschtes Abkühlen infolge einer Störung der Flamme verhindert werden. Die Effizienz des Brennvorgangs ist verbessert. Der Ausstoß von unerwünschten Abgasen, insbesondere der Anteil unverbrannter Kohlenwasserstoffe (Cges), insbesondere von Kohlenstoffmonoxid (CO) und/oder von Kohlenstoffdioxid (CO2) ist reduziert. Das Verfahren ist ökologisch und ökonomisch verbessert. Der Verbrennungsprozess ist nachhaltiger.The essence of the invention is that in a flame protection device several throwing plates are arranged in the circumferential direction with respect to a central longitudinal axis the flame protection device. The throwing plates guarantee advantageous conveyance of the material to be dried in the drying drum. The flame protection device with the throwing plates is arranged in particular in an area of the drying drum in which a burner flame of the burner is arranged. The throwing plates guarantee reliable transport of the material. Undesirable contact of the material to be dried with the burner flame is avoided in particular. This can prevent disruption of the combustion process and undesirable cooling as a result of disruption of the flame. The efficiency of the combustion process is improved. The emission of undesirable exhaust gases, in particular the proportion of unburned hydrocarbons (C total ), in particular carbon monoxide (CO) and/or carbon dioxide (CO 2 ) is reduced. The process is ecologically and economically improved. The combustion process is more sustainable.

Aufgrund des verbesserten Materialtransports wird die Flammenschutzvorrichtung, insbesondere die Wurfbleche, und/oder die Trockentrommel thermisch vor der Brennerflamme und insbesondere vor thermischer Strahlung durch die Brennerflamme geschützt. Das Material kühlt die Flammenschutzvorrichtung.Due to the improved material transport, the flame protection device, in particular the throwing plates, and/or the drying drum are thermally protected from the burner flame and in particular from thermal radiation from the burner flame. The material cools the flame protection device.

Die Wurfbleche sind in Umfangsrichtung bezüglich der Mittellängsachse insbesondere beabstandet zueinander angeordnet. Die Wurfbleche sind insbesondere an einer Innenwand der Trockentrommel befestigt. Für die Befestigung der Wurfbleche an der Innenwand der Trockentrommel dient insbesondere ein separates Halteelement, das insbesondere an der Innenwand der Trockentrommel unmittelbar befestigt, insbesondere angeschweißt ist.The throwing plates are arranged in particular at a distance from one another in the circumferential direction with respect to the central longitudinal axis. The throwing plates are in particular attached to an inner wall of the drying drum. A separate holding element is used in particular to attach the throwing plates to the inner wall of the drying drum, which is in particular directly attached, in particular welded, to the inner wall of the drying drum.

Insbesondere liegt die Innenwand der Trockentrommel zwischen zwei in Umfangsrichtung benachbart angeordneten Wurfblechen bereichsweise frei. Die Wurfbleche sind insbesondere parallel zur Mittellängsachse orientiert.In particular, the inner wall of the drying drum is partially exposed between two throwing plates arranged adjacent to each other in the circumferential direction. The throwing plates are oriented in particular parallel to the central longitudinal axis.

Eine weitere Erkenntnis beruht darauf, dass an den Wurfblechen jeweils mindestens ein Lamellenhalter und insbesondere zwei Lamellenhalter lösbar befestigt sind. An den Lamellenhaltern können Lamellen als Teil der Flammenschutzvorrichtung befestigt werden. Die Lamellen ermöglichen eine zusätzliche Verbesserung des Verbrennungsvorgangs. Dadurch, dass die Lamellenhalter und damit die Lamellen lösbar an den Wurfblechen befestigt sind, ist das Nachrüsten der Lamellen in der Trockentrommel vereinfacht. Insbesondere wurde erkannt, dass die Lamellen aufgrund der hohen thermischen Belastung Verschleißteile sind mit einer mittleren Standzeit von weniger als einem Jahr. Aufgrund der lösbaren Befestigung ist der Austausch der Lamellen vereinfacht. Wartungszeiten sind reduziert. Die Gesamteffizienz der Anlage ist dadurch erhöht. Der Materialeinsatz für den Austausch verschlissener Lamellen ist reduziert.Another finding is that at least one lamella holder and in particular two lamella holders are detachably attached to the throwing plates. Slats can be attached to the lamella holders as part of the flame protection device. The lamellas enable an additional improvement of the combustion process. The fact that the lamella holders and thus the lamellas are detachably attached to the throwing plates makes it easier to retrofit the lamellas in the drying drum. In particular, it was recognized that the lamellas are wearing parts with an average service life of less than a year due to the high thermal load. The detachable attachment makes it easier to replace the lamellas. Maintenance times are reduced. The overall efficiency of the system is therefore increased. The material used to replace worn lamellas is reduced.

Die Wurfbleche sind aus einem hitzebeständigen Werkstoff hergestellt, insbesondere aus einem warmfesten Baustahl, der nach DIN EN 10028-2 mit der Werkstoffnummer 1.5415 oder mit Werkstoffkurznamen 16Mo3 bezeichnet wird. Die Wurfbleche sind insbesondere jeweils als Blechbauteile ausgeführt und insbesondere jeweils aus einem ebenen Blechzuschnitt, insbesondere durch Abkanten hergestellt. Die Blechdicke s des Wurfblechs beträgt insbesondere zwischen 5 mm und 10 mm, insbesondere zwischen 7 mm und 9 mm und insbesondere 8 mm.The throwing plates are made of a heat-resistant material, in particular of a heat-resistant structural steel, which is designated according to DIN EN 10028-2 with the material number 1.5415 or with the material abbreviation 16Mo3. The throwing plates are in particular each designed as sheet metal components and in particular each made from a flat sheet metal cut, in particular by bending. The sheet thickness s of the throwing plate is in particular between 5 mm and 10 mm, in particular between 7 mm and 9 mm and in particular 8 mm.

Die Lamellenhalter sind aus einem hitzebeständigen Werkstoff hergestellt, insbesondere aus einem aus tenitischen Chrom-Nickel-Stahl, insbesondere mit der Werkstoffnummer 1.4841 gemäß DIN EN 10095. Dieser Werkstoff hat in einem relevanten Temperaturbereich von 300°C bis 700°C und insbesondere in einem Bereich von 350°C bis 650°C, insbesondere in einem Bereich von 380°C bis 620°C und insbesondere in einem Bereich von 400°C bis 600°C, einen thermischen Ausdehnungskoeffizienten α zwischen 15 × 10-6 und 20 × 10-6, insbesondere 17 × 10-6 und 18 × 10-6. Es sind auch andere Chrom-Nickel-Stähle möglich, insbesondere mit der Werkstoffnummer 1.4828 oder 1.4742, der unter dem Handelsnamen Sicromal 10 bekannt ist.The slat holders are made of a heat-resistant material, in particular of a tenitic chromium-nickel steel, in particular with the material number 1.4841 according to DIN EN 10095. This material has a thermal expansion coefficient α between 15 × 10- 6 and 20 × 10- 6 , in particular 17 × 10- 6 and 18 × 10- 6 , in a relevant temperature range of 300°C to 700°C and in particular in a range of 350°C to 650°C, in particular in a range of 380°C to 620° C and in particular in a range of 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.

Die Flammenschutzvorrichtung dient für einen Brenner, mit dem insbesondere eine offene Brennerflamme erzeugt wird. Der Brenner kann mit fossilen Brennstoffen, insbesondere fossilen Energieträgern wie beispielsweise Erdgas, Flüssiggas, Heizöl und/oder Kohlenstaub betrieben werden. Zusätzlich oder alternativ kann der Brenner mit regenerativen Brennstoffen betrieben werden wie beispielsweise Holzpellets, Holzstaub, aus Biogas erzeugtes Methan und/oder Wasserstoffgas.The flame protection device is used for a burner, which in particular generates an open burner flame. The burner can be operated with fossil fuels, in particular fossil energy sources such as natural gas, liquid gas, heating oil and/or coal dust. Additionally or alternatively, the burner can be operated with renewable fuels such as wood pellets, wood dust, methane generated from biogas and/or hydrogen gas.

Der Brenner dient insbesondere zum Beheizen einer Trockentrommel, die insbesondere zum Erwärmen von Material in einer Asphaltanlage dient. Die Flammenschutzvorrichtung in einer derartigen Trockentrommel ermöglicht eine erhöhte Zugabe an Recyclingmaterial, also insbesondere Altasphaltgranulat. Die Herstellung von Asphalt ist dadurch nachhaltiger, da der Rohstoffeinsatz reduziert ist.The burner is used in particular to heat a drying drum, which is used in particular to heat material in an asphalt plant. The flame protection device in such a drying drum enables an increased addition of recycled material, in particular old asphalt granulate. The production of asphalt is therefore more sustainable because the use of raw materials is reduced.

Die Trockentrommel gewährleistet einen unkomplizierten und robusten Einbau in die Trockentrommel.The drying drum ensures uncomplicated and robust installation in the drying drum.

Eine Flammenschutzvorrichtung gemäß Anspruch 2 gewährleistet einen verbesserten Materialtransport. Die schaufelartigen Wurfbleche weisen insbesondere in einer Ebene senkrecht zur Mittellängsachse eine L-förmige Kontur auf. Die Wurfbleche sind an der Innenwand der Trockentrommel insbesondere derart angeordnet, dass zwischen den Wurfblechen und der Innenwand der Trockentrommel eine Materialaufnahmekammer gebildet wird, die eine zuverlässige Materialmitnahme ermöglicht. Insbesondere ist das Risiko reduziert, dass sich im Bereich der Brennerflamme ein unerwünschter Materialschleier ausbildet. Insbesondere ist ein derartiger Materialschleier zuverlässig verhindert. Mit einem, insbesondere kurzen, Steg ist das Wurfblech an der Innenwand der Trockentrommel angeordnet. Dieser Steg bildet eine Rückwand des Wurfblechs und bildet bezogen auf die Drehrichtung der Trockentrommel einen hinteren Abschluss des Wurfblechs. Der Rückwand gegenüberliegend ist das Wurfblech geöffnet. Diese Öffnung dient insbesondere zur Aufnahme und/oder Abgabe von zu trocknendem Material, das entlang der Materialförderrichtung gefördert wird. Die Öffnung erstreckt sich insbesondere entlang der vollständigen Breite des Wurfblechs. Das bedeutet, dass das Wurfblech ohne eine der Rückwand gegenüberliegenden Vorderwand ausgeführt ist. Es ist denkbar, das Wurfblech mit einer Vorderwand auszuführen, die sich zumindest bereichsweise entlang der Breite des Wurfblechs erstreckt.A flame protection device according to claim 2 ensures improved material transport. The shovel-like throwing plates have an L-shaped contour, in particular in a plane perpendicular to the central longitudinal axis. The throwing plates are arranged on the inner wall of the drying drum in such a way that a material receiving chamber is formed between the throwing plates and the inner wall of the drying drum, which enables reliable material entrainment. In particular, the risk of an undesirable material veil forming in the area of the burner flame is reduced. In particular, such a material veil is reliably prevented. The throwing plate is arranged on the inner wall of the drying drum with a, in particular short, web. This web forms a rear wall of the throwing plate and forms a rear end of the throwing plate in relation to the direction of rotation of the drying drum. The throwing plate is open opposite the rear wall. This opening is used in particular to receive and/or release material to be dried, which is conveyed along the material conveying direction. The opening extends in particular along the entire width of the throwing plate. This means that the throwing plate is designed without a front wall opposite the rear wall. It is conceivable to design the throwing plate with a front wall that extends at least partially along the width of the throwing plate.

Der Materialaufnahmekanal ist insbesondere entlang der Mittellängsachse offen ausgeführt.The material intake channel is designed to be open, particularly along the central longitudinal axis.

Eine Flammenschutzvorrichtung gemäß Anspruch 3 ermöglicht eine flexible und zuverlässige Befestigung der Wurfbleche. Befestigungsleisten weisen insbesondere jeweils einen Einschubschlitz auf. Der Einschubschlitz weist eine Schlitzbreite auf, die im Wesentlichen der Blechdicke des Wurfblechs entspricht. Die Schlitzbreite kann geringfügig kleiner sein als die Blechdicke des Wurfblechs, um die Befestigung durch Klemmen zu verbessern. Das Wurfblech ist in den Befestigungsleisten insbesondere formschlüssig und/oder kraftschlüssig gehalten. Der Einschubschlitz erstreckt sich insbesondere im Wesentlichen entlang der Umfangsrichtung. Die Wurfbleche sind jeweils in mindestens eine und insbesondere in mehrere Befestigungsleisten aufgeschoben. Die Befestigungsleisten sind insbesondere derart an der Innenwand der Trockentrommel befestigt, dass die Einschubschlitze fluchtend entlang der Mittellängsachse angeordnet sind. Mit den Befestigungsleisten ist eine Befestigung der Wurfbleche möglich, insbesondere lösbar und bezüglich des Anstellwinkels gegenüber der Innenwand der Trockentrommel veränderlich verstellbar.A flame protection device according to claim 3 enables flexible and reliable fastening of the throwing plates. Fastening strips in particular each have an insertion slot. The insertion slot has a slot width that essentially corresponds to the sheet thickness of the throwing plate. The slot width can be slightly smaller than the sheet thickness of the throwing plate in order to improve fastening by clamping. The throwing plate is held in the fastening strips in particular in a form-fitting and/or force-fitting manner. The insertion slot extends in particular essentially along the circumferential direction. The throwing plates are each pushed into at least one and in particular into several fastening strips. The fastening strips are in particular fastened to the inner wall of the drying drum in such a way that the insertion slots are arranged in alignment along the central longitudinal axis. The fastening strips make it possible to fasten the throwing plates, in particular detachably and variably with regard to the angle of attack relative to the inner wall of the drying drum.

Eine Flammenschutzvorrichtung gemäß Anspruch 4 vereinfacht eine robuste Befestigung des Lamellenhalters am Wurfblech. Insbesondere kann der Lamellenhalter vorteilhaft mit einer Schraubverbindung stabil an einer Rückwand des Wurfblechs befestigt werden. Der Lamellenhalter erstreckt sich insbesondere in einer Richtung quer und insbesondere radial bezüglich der Mittellängsachse. Die radial beabstandete Anbringung der Lamellen bezüglich der Wurfbleche ist dadurch vereinfacht.A flame protection device according to claim 4 simplifies a robust fastening of the slat holder to the throwing plate. In particular, the slat holder can advantageously be securely fastened to a rear wall of the throwing plate using a screw connection. The slat holder extends in particular in a transverse direction and in particular radially with respect to the central longitudinal axis. The radially spaced attachment of the slats with respect to the throwing plates is thereby simplified.

Eine Flammenschutzvorrichtung gemäß Anspruch 5 ermöglicht die flexible und vorteilhafte Orientierung des Lamellenhalters bezüglich der Lamelle. Insbesondere kann der Lamellenhalter, der insbesondere als ebener Blechzuschnitt ausgeführt ist, quer und insbesondere senkrecht zur Mittellängsachse orientiert sein und in dieser Orientierung an dem Wurfblech lösbar befestigt werden. Ein Haltewinkel ist insbesondere L-förmig ausgeführt, insbesondere als Winkelprofil mit Bohrungen für eine Schraubverbindung.A flame protection device according to claim 5 enables the flexible and advantageous orientation of the slat holder with respect to the slat. In particular, the slat holder, which is designed in particular as a flat sheet metal cut, can be oriented transversely and in particular perpendicularly to the central longitudinal axis and can be detachably attached to the throwing plate in this orientation. A bracket is particularly L-shaped, in particular as an angle profile with holes for a screw connection.

Eine Flammenschutzvorrichtung gemäß Anspruch 6 ermöglicht eine unkomplizierte Ausbildung eines Materialaufnahmekanals, der sich insbesondere entlang mehrerer, insbesondere entlang der Mittellängsachse hintereinander angeordneter, Wurfbleche erstreckt. Der Materialaufnahmekanal ermöglicht die zuverlässige Materialförderung entlang der Materialförderrichtung durch die Trockentrommel. Die Wurfbleche sind insbesondere fluchtend bezüglich der Mittelängsachse zueinander angeordnet.A flame protection device according to claim 6 enables an uncomplicated formation of a material receiving channel which extends in particular along several throwing plates, in particular arranged one behind the other along the central longitudinal axis. The material receiving channel enables reliable material conveyance along the material conveying direction through the drying drum. The throwing plates are arranged in particular in alignment with one another with respect to the central longitudinal axis.

Ein Deckelelement gemäß Anspruch 7 verhindert ein unbeabsichtigtes, insbesondere stirnseitiges, Austreten des erhitzten Materials aus dem Materialaufnahmekanal. Das Material wird insbesondere über die Wurfbleche an einen Materialaustritt aus der Trockentrommel abgegeben. Ein Deckelelement ist insbesondere stirnseitig an dem Wurfblech angebracht, insbesondere senkrecht zur Mittellängsachse orientiert. Das Deckelelement ist insbesondere mit dem Wurfblech verschweißt.A cover element according to claim 7 prevents the heated material from accidentally escaping from the material receiving channel, in particular from the front. The material is released in particular via the throwing plates to a material outlet from the drying drum. A cover element is attached in particular to the front of the throwing plate, in particular oriented perpendicular to the central longitudinal axis. The cover element is in particular welded to the throwing plate.

Ein Wurfblech gemäß Anspruch 8 ermöglicht die Vorteile der Flammenschutzvorrichtung selbst.A throwing plate according to claim 8 enables the advantages of the flame protection device itself.

Eine Trockentrommel gemäß Anspruch 9 ermöglicht die vorteilhafte Durchführung des Verbrennungsprozesses mit erhöhter Effizienz und/oder reduziertem Abgasausstoß. Insbesondere ermöglicht die Trockentrommel die Verwendung erhöhter Altasphaltgranulat-Anteile bei der Asphaltherstellung. Der Austausch verschlissener Lamellen mittels der an den Wurfblechen lösbar befestigten Lamellenhaltern ist vereinfacht.A drying drum according to claim 9 enables the advantageous implementation of the combustion process with increased efficiency and/or reduced exhaust emissions. In particular, the drying drum enables the use of increased amounts of old asphalt granulate in asphalt production. The replacement of worn lamellae is simplified by means of the lamella holders detachably attached to the throwing plates.

Sowohl die in den Patentansprüchen angegebenen Merkmale als auch die in den nachfolgenden Ausführungsbeispielen der erfindungsgemäßen Flammenschutzvorrichtung angegebenen Merkmale sind jeweils für sich allein oder in Kombination miteinander geeignet, den erfindungsgemäßen Gegenstand weiterzubilden. Die jeweiligen Merkmalskombinationen stellen hinsichtlich der Weiterbildungen des Erfindungsgegenstandes keine Einschränkung dar, sondern weisen im Wesentlichen lediglich beispielshaften Charakter auf.Both the features specified in the patent claims and the features specified in the following embodiments of the flame protection device according to the invention are suitable, either alone or in combination with one another, for further developing the subject matter of the invention. The respective combinations of features do not represent any restriction with regard to the further developments of the subject matter of the invention, but essentially only have an exemplary character.

Weitere vorteilhafte Ausgestaltungen, zusätzliche Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung. Es zeigen:

Fig. 1
eine schematische Schnittansicht einer Anordnung mit einem an einer Trockentrommel angebrachten Brenner und einer in der Trockentrommel angeordneten Flammenschutzvorrichtung gemäß der Erfindung,
Fig. 2
einen Längsschnitt durch die Trockentrommel gemäß Fig. 1,
Fig. 3
eine Ansicht der Trockentrommel gemäß Pfeil III in Fig. 1,
Fig. 4
eine vergrößerte Teil-Schnittdarstellung gemäß Schnittlinie V-V in Fig. 2,
Fig. 5
eine perspektivische Ansicht eines stirnseitigen Endes der Trockentrommel gemäß Fig. 2,
Fig. 6
eine vergrößerte Detailansicht des Details VI in Fig. 5
Fig. 7
eine abweichende Ansicht der Trockentrommel gemäß Fig. 5,
Fig. 8
eine vergrößerte Detailansicht des Details VIII in Fig. 7,
Fig. 9
eine perspektivische Einzelansicht einer Lamelle gemäß Fig. 8.
Further advantageous embodiments, additional features and details of the invention emerge from the following description of an embodiment with reference to the drawing. They show:
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 to Fig.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 a front end of the drying drum according to Fig.2 ,
Fig.6
an enlarged detailed 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 view of a slat according to Fig.8 .

Eine in Fig. 1 als Ganzes mit 1 bezeichnete Anordnung umfasst eine Trockentrommel 2, an der stirnseitig ein Brenner 3 angeordnet ist. Die Anordnung 1 ist insbesondere Teil einer Aspaltanlage, in der Asphaltmaterial hergestellt wird.One in Fig.1 The arrangement, designated as a whole by 1, comprises a drying drum 2, on the front of which a burner 3 is arranged. The arrangement 1 is in particular part of an asphalt plant in which asphalt material is produced.

In der Trockentrommel 2 wird insbesondere Weißmineral im Gegenstromverfahren erhitzt. Das bedeutet, dass eine Materialströmungsrichtung 4 und eine Wärmeausbreitungsrichtung 5 einander entgegengesetzt orientiert sind. Die Trockentrommel 2 kann auch im Gleichstromverfahren betrieben werden. Insbesondere können in der Trockentrommel 2 auch andere Materialien, insbesondere Gestein und/oder Altasphaltmaterial erwärmt werden.In the drying drum 2, white mineral in particular is heated in a countercurrent process. This means that a material flow direction 4 and a heat propagation direction 5 are oriented opposite to one another. The drying drum 2 can also be operated in a cocurrent process. In particular, other materials, in particular rock and/or old asphalt material, can also be heated in the drying drum 2.

Der Brenner 3 erzeugt eine Brennerflamme 6, die zumindest anteilig in die Trockentrommel 2 hineinragt.The burner 3 generates a burner flame 6 which extends at least partially into the drying drum 2.

In der Trockentrommel 2 ist, insbesondere im Bereich der Brennerflamme 6, eine Flammenschutzvorrichtung angeordnet. Die Flammenschutzvorrichtung weist eine Mittellängsachse 7 auf, die mit einer Drehachse 8 der Trockentrommel 2 zusammenfällt.A flame protection device is arranged in the drying drum 2, in particular in the area of the burner flame 6. The flame protection device has a central longitudinal axis 7 which coincides with an axis of rotation 8 of the drying drum 2.

Die Flammenschutzvorrichtung weist mehrere Lamellen 9 auf, die in Umfangsrichtung 10 bezüglich der Mittellängsachse 7 angeordnet sind. Die Lamellen 9 garantieren, dass thermisch aufgeheizte Luft innerhalb der Umfangsanordnung 10 verbleibt und nicht unbeabsichtigt nach außen strömt, insbesondere in radialer Richtung bezogen auf die Mittellängsachse 7. Die Lamellen 9 verhindern, dass in der Trockentrommel 2 erhitztes Material unbeabsichtigt in Brennerflamme 6 fällt und damit den Brennvorgang nachteilig beeinträchtigt.The flame protection device has several lamellae 9, which are arranged in the circumferential direction 10 with respect to the central longitudinal axis 7. The Slats 9 ensure that thermally heated air remains within the peripheral arrangement 10 and does not inadvertently flow outwards, in particular in a radial direction relative to the central longitudinal axis 7. The slats 9 prevent material heated in the drying drum 2 from inadvertently falling into the burner flame 6 and thus adversely affecting the burning process.

Die Flammenschutzvorrichtung weist Wurfbleche 11 auf. Die Wurfbleche 11 sind konzentrisch bezüglich der Mittellängsachse 7, insbesondere bezüglich der Lamellen 9 in der Trockentrommel 2 angeordnet. Die Wurfbleche 11 sind im Flammbereich der Trockentrommel 2 angeordnet. Die Wurfbleche 11 ermöglichen bei einer Drehung der Trockentrommel 2 eine Mitnahme des zu trocknenden Materials, also eine Materialförderung entlang der Materialförderrichtung 4. Die Wurfbleche 11 sind insbesondere derart ausgeführt, dass bei der Materialmitnahme ein Materialschleier in der Trockentrommel 2 verhindert ist. Das bedeutet, dass das Material bei der Drehung der Trockentrommel 2 um die Drehachse 8 in den Wurfblechen 11 in radialer Richtung gehalten ist und insbesondere ausschließlich eine axiale Materialförderung entlang der Materialförderrichtung 4 erfolgt. Insbesondere ist mit den Wurfblechen 11 zuverlässig verhindert, dass das Material schwerkraftbedingt in der Trockentrommel 2 von oben nach unten rieselt und einen Materialschleier bildet.The flame protection device has throwing plates 11. The throwing plates 11 are arranged concentrically with respect to the central longitudinal axis 7, in particular with respect to the slats 9 in the drying drum 2. The throwing plates 11 are arranged in the flame area of the drying drum 2. When the drying drum 2 rotates, the throwing plates 11 enable the material to be dried to be entrained, i.e. material to be conveyed along the material conveying direction 4. The throwing plates 11 are designed in particular in such a way that a material veil in the drying drum 2 is prevented when the material is entrained. This means that when the drying drum 2 rotates about the axis of rotation 8, the material is held in the throwing plates 11 in the radial direction and in particular only an axial material conveyance takes place along the material conveying direction 4. 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 material veil.

Durch die Mitnahme des Materials in den Wurfblechen 11 werden sowohl die Wurfbleche 11 selbst als auch die Trockentrommel 2 thermisch vor der Brennerflamme 6 und/oder der von der Brennerflamme 6 abgegebenen Wärmestrahlung geschützt. Dadurch kühlt das Material die Einbauten und die Trockentrommel 2.By entraining 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. As a result, the material cools the internals and the drying drum 2.

An den Wurfblechen 11 sind Lamellenhalter 12 befestigt, die zum Halten der Lamellen 9 dienen. Die Lamellenhalter 12 sind an den Wurfblechen 11 befestigt. Die Lamellenhalter 12 erstrecken sich insbesondere senkrecht zur Mittellängsachse 7 und insbesondere radial.Slat holders 12 are attached to the throwing plates 11 and serve to hold the slats 9. The slat holders 12 are attached to the throwing plates 11. The slat holders 12 extend in particular perpendicular to the central longitudinal axis 7 and in particular radially.

Die Flammenschutzvorrichtung weist eine Prallwand 13 auf. Die Prallwand 13 ist entlang der Mittellängsachse 7 axial beabstandet zu den Lamellen 9 angeordnet. Die Prallwand 13 ist scheibenartig und insbesondere im Wesentlichen kreisförmig ausgeführt und mit mindestens einem Prallwand-Befestigungselement 14 in der Trockentrommel 2 befestigt. Die Prallwand 13 verhindert, dass die Brennerflamme 6 unbeabsichtigt in einen hinter der Prallwand 13 angeordneten weiteren Wurfblechbereich der Trockentrommel 2 durchschlägt. In diesem weiteren Wurfblechbereich wird gezielt ein Materialschleier erzeugt. Mit der Prallwand 13 wird eine Materialschädigung verhindert.The flame protection device has a baffle 13. The baffle 13 is arranged along the central longitudinal axis 7 at an axial distance from the slats 9. The baffle 13 is disk-like and in particular essentially circular and is fastened in the drying drum 2 with at least one baffle fastening element 14. The baffle 13 prevents the burner flame 6 from accidentally breaking through into another throwing plate area of the drying drum 2 arranged behind the baffle 13. A material veil is deliberately created in this other throwing plate area. The baffle 13 prevents material damage.

Nachfolgend wird anhand von Fig. 2 bis Fig. 9 die Flammenschutzvorrichtung näher erläutert.The following is based on Fig. 2 to Fig. 9 the flame protection device is explained in more detail.

Eine Umfangsanordnung der Lamellen 9 umfasst achtzehn einzelne Lamellen 9. Die Lamellen 9 sind funktional identisch ausgeführt und weisen insbesondere identische Abmessungen auf. In Abhängigkeit der zu bildenden Größe, also der lichten Weite der Umfangsanordnung können auch mehr oder weniger als achtzehn Lamellen 9 für die Bildung einer Umfangsanordnung verwendet werden.A circumferential arrangement of the slats 9 comprises eighteen individual slats 9. The slats 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 slats 9 can be used to form a circumferential arrangement.

Entlang der Mittellängsachse 7 sind gemäß dem gezeigten Ausführungsbeispiel vier Umfangsanordnungen hintereinander angeordnet. Es können auch mehr oder weniger als vier Umfangsordnungen hintereinander angeordnet sein. Die einzelnen Umfangsanordnungen sind insbesondere identisch ausgeführt. Es ist auch denkbar, dass die Umfangsanordnungen unterschiedliche Durchmesser aufweisen und/oder zumindest abschnittsweise konisch ausgeführt sind.According to the embodiment shown, four circumferential arrangements are arranged one behind the other along the central longitudinal axis 7. more or less than four circumferential orders can be arranged one behind the other. The individual circumferential arrangements are in particular designed identically. It is also conceivable that the circumferential arrangements have different diameters and/or are designed conically at least in sections.

Die Lamellen 9 weisen jeweils einen nach innen, also der Brennerflamme 6 zugewandten Flammenschutzabschnitt 15 auf. Der Flammenschutzabschnitt 15 weist eine rechteckige Kontur auf mit einer Länge L und einer Breite B. Gemäß dem gezeigten Ausführungsbeispiel ist die Länge L der Lamelle 9 größer als deren Breite B. Insbesondere gilt L >= 1,2 x B, insbesondere L > = 1,5 x B, insbesondere L > = 2,0 x B, insbesondere L > = 2,5 x B und insbesondere L < = 10 x B. Die Lamellen 9 sind in der Umfangsanordnung bezüglich ihrer Längsrichtung nebeneinander angeordnet. In der Umfangsanordnung sind die Lamellen 9 mit ihrer Längsrichtung parallel zur Mittellängsachse 7 orientiert. Das bedeutet, dass eine von den Lamellen 9 in einer Ebene senkrecht zur Mittellängsachse 7 gebildete Kontur entlang der Mittellängsachse 7 konstant ist. Dadurch, dass die Flammenschutzabschnitte 15 eben ausgeführt sind, weist die Umfangsanordnung in einer Ebene senkrecht zur Mittellängsachse 7 eine Innenkontur auf, die im Wesentlichen polygonartig ausgeführt ist.The slats 9 each have a flame protection section 15 facing inwards, i.e. towards the burner flame 6. The flame protection section 15 has a rectangular contour with a length L and a width B. According to the exemplary embodiment shown, the length L of the slat 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 slats 9 are arranged next to one another in the circumferential arrangement with respect to their longitudinal direction. In the circumferential arrangement, the slats 9 are oriented with their longitudinal direction parallel to the central longitudinal axis 7. This means that a contour formed by the slats 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 flat, the peripheral arrangement has an inner contour in a plane perpendicular to the central longitudinal axis 7 which is essentially polygonal.

Die Lamellen 9 sind aus dem Werkstoff mit der Nummer 1.4841 aus einem Blechzuschnitt hergestellt. Die Blechdicke s liegt insbesondere in einem Bereich von 3 mm bis 10 mm und insbesondere zwischen 5 mm und 7 mm.The slats 9 are made from a sheet metal blank made of material with the number 1.4841. The sheet thickness s is in particular in a range from 3 mm to 10 mm and in particular between 5 mm and 7 mm.

Die Lamelle 9 weist an ihren Längskanten einteilig angeformte Dichtelemente 16, 17 auf. Die Dichtelemente 16, 17 sind als Abkantungen ausgeführt. Die Dichtelemente 16, 17 sind einander korrespondierend ausgeführt.The slat 9 has sealing elements 16, 17 formed in one piece on its longitudinal edges. The sealing elements 16, 17 are designed as bevels. The sealing elements 16, 17 are designed to correspond to one another.

Die Dichtelemente 16, 17 bilden seitliche Dichtelemente an den Lamellen 9. Die Dichtelemente 16, 17 bilden Dichtleisten. Die Dichtelemente 16, 17 sind derart ausgeführt, dass die Lamellen 9 in der Umfangsordnung mit den Dichtelementen 16, 17 abwechselnd angeordnet sind.The sealing elements 16, 17 form lateral sealing elements on the slats 9. The sealing elements 16, 17 form sealing strips. The sealing elements 16, 17 are designed such that the slats 9 are arranged alternately with the sealing elements 16, 17 in the circumferential order.

Ein erstes Dichtelement 16 weist im Wesentlichen eine S-Kontur auf. Die S-Kontur erstreckt sich insbesondere ausgehend von dem Flammenschutzabschnitt 15 in einer der Brennerflamme 6 abgewandten Richtung. Das erste Dichtelement 16 bildet eine konkav ausgebildete Aufnahme.A first sealing element 16 essentially has an S-contour. The S-contour extends in particular from the flame protection section 15 in a direction facing away from the burner flame 6. The first sealing element 16 forms a concave receptacle.

Das zweite Dichtelement 17 weist eine Kontur auf, die einer abgerundeten Pfeilspitze entspricht. Das zweite Dichtelement 17 bildet einen konvex geformten Vorsprung.The second sealing element 17 has a contour that corresponds to a rounded arrowhead. The second sealing element 17 forms a convex-shaped projection.

Die konvexe Außenkontur des zweiten Dichtelements 17 entspricht der konkaven Innenkontur des ersten Dichtelements 16. Insbesondere kann das zweite Dichtelement 17 einer Lamelle 9 an dem ersten Dichtelement 16 einer benachbarten Lamelle 9 angeordnet werden. Diese Anordnung benachbarter Lamellen 9 mit den ineinander angeordneten Dichtelementen 16, 17 ist insbesondere in Fig. 4 und 6 dargestellt. Korrespondierende Dichtelemente 16, 17 benachbarter Lamellen 9 greifen ineinander, so dass allenfalls ein dünner Luftspalt verbleibt, der jedenfalls kleiner ist als die Blechdicke s der Lamellen 9. Insbesondere beträgt die maximale Spaltbreite höchstens 0,5 x s, insbesondere höchstens 0,3 x s, insbesondere höchstens 0,2 x s und insbesondere 0,1 x s.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 lamellas 9 with the sealing elements 16, 17 arranged one inside the other is particularly Fig.4 and 6 Corresponding sealing elements 16, 17 of adjacent lamellae 9 engage with one another, 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.

Aufgrund dieses dünnen Spalts zwischen den benachbarten Lamellen 9 wird eine Umfangs-Spaltdichtung gebildet. Infolge der thermischen Ausdehnung der Lamellen 9 im Betrieb der Trockentrommel 2 nimmt die Spaltbreite weiterhin ab.Due to this thin gap between the adjacent lamellae 9, a circumferential gap seal is formed. As a result of the thermal expansion of the lamellae 9 during operation of the drying drum 2, the gap width continues to decrease.

Dadurch, dass die Lamellen 9 einer Umfangsanordnung mit den jeweils benachbarten Dichtelementen 16, 17 ineinander greifen, ist die Umfangsanordnung selbsttragend ausgeführt. Es ist verhindert, dass sich die Lamellen 9 unbeabsichtigt voneinander lösen. Durch die Dichtelemente 16, 17 hintergreifen sich die benachbarten Lamellen 9 derart, dass die Umfangsanordnung in radialer Richtung bezogen auf die Mittellängsachse 7 stabil ausgeführt ist.Because the lamellae 9 of a circumferential arrangement engage with the adjacent sealing elements 16, 17, the circumferential arrangement is designed to be self-supporting. The lamellae 9 are prevented from accidentally separating from one another. The sealing elements 16, 17 engage behind one another in such a way that the circumferential arrangement is designed to be stable in the radial direction relative to the central longitudinal axis 7.

An einer Querkante, die in Breitenrichtung orientiert ist, weisen die Lamellen 9 eine vordere Abkantung 18 auf. Die vordere Abkantung 18 ist gegenüber der von dem Flammenschutzabschnitt 15 gebildeten Ebene um einen Neigungswinkel nach unten geneigt. Dieser Neigungswinkel beträgt höchstens 30°, insbesondere höchstens 20°, insbesondere höchstens 15° und insbesondere höchstens 10°. Die Abkantung 18 fungiert als Einstecklasche, die insbesondere in die jeweils davor angeordnete Umfangsanordnung einsteckbar ist.The slats 9 have a front bevel 18 on a transverse edge that is oriented in the width direction. The front bevel 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 bevel 18 functions as an insertion tab that can be inserted in particular into the peripheral arrangement arranged in front of it.

Wenn mehrere Umfangsanordnungen entlang der Mittellängsachse 7 hintereinander angeordnet sind, werden die Lamellen 9 der jeweils hinteren Umfangsanordnung mit der Abkantung 18 unter die jeweilige Lamelle 9 der davor angeordneten Umfangsanordnung geschoben. Das bedeutet, dass die Abkantung 18 an der der Brennerflamme 6 zugewandten Innenseite der Umfangsanordnung angeordnet ist. Durch die Abkantung 18 ist zwischen den entlang der Mittellängsachse 7 hintereinander angeordneten Umfangsanordnungen eine Axial-Spaltdichtung ausgebildet. Die Dichtigkeit der Umfangsanordnungen ist hoch.If several circumferential arrangements are arranged one behind the other along the central longitudinal axis 7, the slats 9 of the respective rear circumferential arrangement are pushed with the bevel 18 under the respective slat 9 of the circumferential arrangement arranged in front of it. This means that the bevel 18 is arranged on the inside of the circumferential arrangement facing the burner flame 6. The bevel 18 is between An axial gap seal is formed in the circumferential arrangements arranged one behind the other along the central longitudinal axis 7. The tightness of the circumferential arrangements is high.

Die entlang der Mittellängsachse 7 hintereinander angeordneten Lamellen 9 sind fluchtend angeordnet.The slats 9 arranged one behind the other along the central longitudinal axis 7 are aligned.

Jede Lamelle 9 wird von mindestens einem Lamellenhalter 19 und gemäß dem gezeigten Ausführungsbeispiel von zwei Lamellenhaltern 19 gehalten. Der Lamellenhalter 19 ist aus einem ebenen Blechzuschnitt hergestellt und weist insbesondere eine leistenartige Kontur auf. Der Lamellenhalter 19 ist insbesondere aus demselben Material wie die Lamelle 9 hergestellt. Die Blechdicke des Lamellenhalters beträgt insbesondere zwischen 8 mm und 15 mm und insbesondere zwischen 10 mm und 12 mm.Each slat 9 is held by at least one slat holder 19 and, according to the embodiment shown, by two slat holders 19. The slat holder 19 is made from a flat sheet metal blank and in particular has a strip-like contour. The slat holder 19 is in particular made from the same material as the slat 9. The sheet metal thickness of the slat holder is in particular between 8 mm and 15 mm and in particular between 10 mm and 12 mm.

Gemäß dem gezeigten Ausführungsbeispiel weist der Lamellenhalter 19 Vorsprünge, insbesondere zwei Haltestifte, auf, die insbesondere stirnseitig angeordnet sind. Die Haltestifte können in Ausnehmungen 20 eingreifen, die am Flammenschutzabschnitt 15 angeordnet sind. Die Ausnehmungen 20 sind insbesondere als Durchstanzungen ausgeführt. Die Lamelle 9 ist insbesondere auf dem Lamellenhalter 19 abgestützt oder aufgelegt. Die Ausnehmungen 20 dienen als Montagehilfe für den Lamellenhalter 19 der Lamelle 9. Insbesondere ist die Lamelle 9 am Lamellenhalter 19 lösbar befestigt. Die Montage der Umfangsanordnung ist dadurch vereinfacht. Zusätzlich oder alternativ können die Lamellenhalter 19 an der Lamelle 9 auch unlösbar befestigt sein, insbesondere angeschweißt.According to the embodiment shown, the slat holder 19 has projections, in particular two retaining pins, which are arranged in particular on the front side. The retaining pins can engage in recesses 20 which are arranged on the flame protection section 15. The recesses 20 are designed in particular as punched-through holes. The slat 9 is in particular supported or placed on the slat holder 19. The recesses 20 serve as an assembly aid for the slat holder 19 of the slat 9. In particular, the slat 9 is detachably attached to the slat holder 19. The assembly of the peripheral arrangement is thereby simplified. Additionally or alternatively, the slat holders 19 can also be permanently attached to the slat 9, in particular welded on.

Jeweils mindestens eine Lamelle 31 je Umfangsanordnung ist bezüglich der Ausnehmungen 20 verschieden ausgeführt. Diese Lamelle wird als Abschluss-Lamelle 31 bezeichnet. Entsprechend weisen die zugehörigen Abschluss-Lamellenhalter 32 für die Abschluss-Lamelle 31 keine vorstehenden Haltestifte, sondern eine umgebogene Aufliegelasche 21 auf, die insbesondere in Fig. 5 dargestellt ist.At least one lamella 31 per 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 any protruding retaining pins, but rather a bent support tab 21, which is particularly in Fig.5 is shown.

Die Umfangsanordnung wird dadurch gebildet, dass in Umfangsrichtung 10 der Reihe nach Lamellen 9 benachbart zueinander angeordnet und an den jeweiligen Lamellenhaltern 19 aufgelegt werden. Dabei werden die Lamellen 19 durch die ineinandergreifenden Dichtelemente 16, 17 einerseits und durch das Eingreifen der Haltestifte in die Ausnehmungen 20 andererseits stabilisiert. Als letzte Lamelle wird die Abschluss-Lamelle 31 axial, also in einer Richtung parallel zur Mittellängsachse 7 eingeschoben und kommt dabei mit den beiden jeweils benachbarten Lamellen 9 in Eingriff. Durch die Dichtelemente 16, 17 ist ein Hinterschnitt in radialer Richtung zwischen benachbarten Lamellen 9 bzw. 9, 31 gewährleistet. Die zuletzt montierte Abschluss-Lamelle 31 wird an den Aufliegelaschen 21 befestigt, insbesondere verschweißt.The circumferential arrangement is formed by arranging slats 9 in a row adjacent to one another in the circumferential direction 10 and placing them on the respective slat holders 19. The slats 19 are stabilized by the interlocking sealing elements 16, 17 on the one hand and by the engagement of the retaining pins in the recesses 20 on the other. The final slat, the closing slat 31, is inserted axially, i.e. in a direction parallel to the central longitudinal axis 7, and in doing so comes into engagement with the two adjacent slats 9. The sealing elements 16, 17 ensure an undercut in the radial direction between adjacent slats 9 and 9, 31. The last-mounted closing slat 31 is attached to the support tabs 21, in particular welded.

Durch die Verwendung der Lamellenhalter 19 ist es möglich, dass die Lamellen 9 mit einem Radialabstand bezüglich einer Innenwand 22 der Trockentrommel 2 in der Trockentrommel 2 angeordnet sind. Die Lamellen 9 bilden einen von der Innenwand 22 beabstandet angeordneten und konzentrisch zur Mittellängsachse 7 ausgerichteten Einbau. Die Umfangsanordnung ist im Wesentlichen ringartig ausgeführt mit der polygonen Innenkontur. Die Umfangsanordnung ist fest mit der Trockentrommel 2 verbunden. Bei der Drehung der Trockentrommel 2 dreht die Umfangsanordnung mit.By using the slat holders 19, it is possible for the slats 9 to be arranged in the drying drum 2 at a radial distance from an inner wall 22 of the drying drum 2. The slats 9 form an installation that is arranged at a distance from the inner wall 22 and is aligned concentrically to the central longitudinal axis 7. The peripheral arrangement is essentially ring-shaped with the polygonal inner contour. The peripheral arrangement is firmly connected to the drying drum 2. When the drying drum 2 rotates, the peripheral arrangement rotates with it.

Bezüglich der Lamellen 9 sind die Wurfbleche 11 in radialer Richtung bezogen auf die Drehachse 8 radial nach außen versetzt angeordnet. Insbesondere sind die Wurfbleche 11 an der Innenwand 22 der Trockentrommel 2 angeordnet.With respect to the slats 9, the throwing plates 11 are arranged offset radially outwards in the radial direction relative to the axis of rotation 8. In particular, the throwing plates 11 are arranged on the inner wall 22 of the drying drum 2.

Dazu können unmittelbar an der Innenwand 22 Haltelaschen 23 befestigt, insbesondere angeschweißt sein. An den Haltelaschen 23 ist jeweils eine Befestigungsleiste 24 lösbar befestigt, insbesondere angeschraubt. Insbesondere ist jedes Wurfblech 11 mit mehreren, insbesondere drei, Befestigungsleisten 24 gehalten, wobei die Befestigungsleisten 24 identisch ausgeführt und entlang der Mittellängsachse 7 beabstandet zueinander angeordnet sind.For this purpose, retaining tabs 23 can be attached, in particular welded, directly to the inner wall 22. A fastening strip 24 is detachably attached, in particular screwed, to each of the retaining tabs 23. In particular, each throwing plate 11 is held by several, in particular three, fastening strips 24, the fastening strips 24 being identical and arranged at a distance from one another along the central longitudinal axis 7.

Die Befestigungsleisten 24 weisen jeweils eine schlitzförmige Aufnahme 25 auf, in die die Wurfbleche 11 eingeschoben werden.The fastening strips 24 each have a slot-shaped receptacle 25 into which the throwing plates 11 are inserted.

Das Wurfblech 11 ist schaufelartig ausgeführt und weist in einer senkrecht zur Mittellängsachse 7 orientierten Ebene eine L-förmige Kontur auf. Das Wurfblech 11 ist an der Innenwand 22 der Trockentrommel 2 derart angeordnet, dass der kurze Steg des "L" sich im Wesentlichen parallel zur Innenwand 22 der Trockentrommel 2 erstreckt. Im Wesentlichen bedeutet, dass das Wurfblech 11 an das als die Innenwand 22 der Trockentrommel 2 keine Krümmung aufweist. Zur Erhöhung der Steifigkeit kann das Wurfblech 11 mit Abkantungen ausgeführt sein. Zwischen dem Wurfblech 11 und der Innenwand 22 der Trockentrommel 2 wird eine Materialaufnahmekammer gebildet, die in einer Ebene senkrecht zur Mittellängsachse 7 eine offene Rechteckkontur aufweist. Das Rechteck ist an ein dem kurzen Steg des "L" gegenüberliegenden Seite offen. Die Materialaufnahmekammer ist insbesondere auch entlang der Mittellängsachse 7 offen. Es ist möglich, dass diese Stirnseiten der Materialaufnahmekammer durch separate Deckelelemente 26 verschlossen sind. Insbesondere ist die dem Materialauslauf der Trockentrommel 2 zugewandte Stirnseite der Materialaufnahmekammer durch das Deckelelement 26 verschlossen. Das Deckelelement 26 ist an dem Wurfblech 11 befestigt, insbesondere angeschweißt.The throwing plate 11 is designed like a shovel 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 in such a way that the short web of the "L" extends essentially parallel to the inner wall 22 of the drying drum 2. Essentially means that the throwing plate 11 has no curvature on the inner wall 22 of the drying drum 2. To increase the rigidity, the throwing plate 11 can be designed with bevels. 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 a side opposite the short web of the "L". The material receiving chamber is also open in particular along the central longitudinal axis 7. It is possible, that these front sides of the material receiving chamber are closed by separate cover elements 26. In particular, the front side 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 throwing plate 11, in particular welded thereto.

Die entlang der Mittellängsachse 7 hintereinander angeordneten Wurfbleche 11 sind insofern durchgängig zueinander angeordnet, also stirnseitig aneinander anstoßend. Durch die Wurfbleche 11 bildet sich der über mehrere Wurfbleche 11 erstreckende Materialaufnahmekanal.The throwing plates 11 arranged one behind the other along the central longitudinal axis 7 are arranged in a continuous manner to one another, i.e. they abut one another at the front. The throwing plates 11 form the material receiving channel extending over several throwing plates 11.

Durch die Ausführung der Wurfbleche 11 ist gewährleistet, dass das zu erhitzende Material in der Trockentrommel 2 zuverlässig mitgenommen wird, aber kein Materialschleier im Bereich der Lamellen 9 gebildet wird.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 veil is formed in the area of the slats 9.

Der kurze Steg des "L" bildet eine Rückwand 27 des Wurfblechs 11. An der Rückwand 27 sind jeweils die Lamellenhalter 19 der Lamellen 9 lösbar befestigt. Gemäß dem gezeigten Ausführungsbeispiel dient dazu insbesondere jeweils ein Haltewinkel 28, der insbesondere als L-Profil ausgeführt ist und eine Verschraubung um 90° zueinander orientierten Blechabschnitte ermöglicht.The short web of the "L" forms a rear wall 27 of the throwing plate 11. The slat holders 19 of the slats 9 are detachably attached to the rear wall 27. According to the embodiment shown, a holding bracket 28 is used for this purpose, which is designed in particular as an L-profile and enables sheet metal sections oriented at 90° to one another to be screwed together.

Besonders vorteilhaft ist, dass die Lamellenhalter 19 lösbar an den Wurfblechen 11 befestigt sind. Das Nachrüsten der Lamellenhalter 19 und/oder der daran gehaltenen Lamellen 9 ist vereinfacht. Insbesondere ist es nicht erforderlich, dass die Lamellen 9 mit den Lamellenhaltern 19 an der Innenwand selbst befestigt werden. Der Montageaufwand und Demontageaufwand sind reduziert.It is particularly advantageous that the slat holders 19 are detachably attached to the throwing plates 11. Retrofitting the slat holders 19 and/or the slats 9 held thereon is simplified. In particular, it is not necessary for the slats 9 to be attached to the inner wall itself using the slat holders 19. The assembly and disassembly effort is reduced.

Insbesondere ist für jede Lamelle 9 mindestens ein Wurfblech 11 vorhanden. Korrespondierende Lamellen 9 und Wurfbleche 11 sind in radialer Richtung bezogen auf die Mittellängsachse 7 fluchtend angeordnet.In particular, there is at least one throwing plate 11 for each lamella 9. Corresponding lamellas 9 and throwing plates 11 are arranged in alignment in the radial direction with respect to the central longitudinal axis 7.

Gemäß dem gezeigten Ausführungsbeispiel sind zusätzlich zu den vier Wurfblechanordnungen, die konzentrisch zu den jeweiligen Umfangsanordnungen der Lamellen 9 angeordnet sind, zwei weitere Reihen an Wurfblechen 11 vorhanden. An diesen Wurfblechen 11 sind keine Lamellen 9 befestigt. Diese Wurfbleche sind insofern freiliegend angeordnet.According to the embodiment shown, in addition to the four throwing plate arrangements, which are arranged concentrically to the respective circumferential arrangements of the slats 9, there are two further rows of throwing plates 11. No slats 9 are attached to these throwing plates 11. These throwing plates are therefore arranged in an exposed manner.

Axial beabstandet zu den Lamellen 9 ist die Prallwand 13 angeordnet, die insbesondere in Fig. 3 dargestellt ist. Die Prallwand 13 ist aus mehreren, gemäß dem gezeigten Ausführungsbeispiel drei, identischen Prallwandsegmenten 29 ausgeführt. Die Prallwandsegmente 29 weisen jeweils einen Scheibenabschnitt und ein einteilig daran befestigtes Prallwand-Befestigungselement 14 auf. Die Scheibenabschnitte sind jeweils entsprechend einer Drittel-Kreisscheibe ausgeführt, also mit einem Öffnungswinkel von 120° bezogen auf die Mittellängsachse 7. Zur Verbindung der Prallwandsegmente 29 sind Flanschleisten an den Parallelwandsegmenten 29 abgekantet und miteinander verschraubt. Die Prallwandsegmente 29 sind mittels der Prallwand-Befestigungselemente 14 und mittels einer dafür vorgesehenen Haltelasche 30 an korrespondierenden Wurfblechen 11 befestigt.The baffle wall 13 is arranged axially spaced from the slats 9, which is particularly Fig.3 is shown. The impact wall 13 is made up of several identical impact wall segments 29, three according to the embodiment shown. The impact wall segments 29 each have a disk section and a one-piece impact wall fastening element 14 attached to it. The disk sections are each designed like a third of a circular disk, i.e. with an opening angle of 120° in relation to the central longitudinal axis 7. To connect the impact wall segments 29, flange strips are bent on the parallel wall segments 29 and screwed together. The impact wall segments 29 are attached to corresponding throwing plates 11 by means of the impact wall fastening elements 14 and by means of a retaining tab 30 provided for this purpose.

Claims (9)

Flammenschutzvorrichtung für einen Brenner (3), insbesondere in einer Trockentrommel (2), insbesondere einer Asphaltanlage, wobei die Flammenschutzvorrichtung eine Mittellängsachse (7) und mehrere Wurfbleche (11) aufweist, die in Umfangsrichtung (10) bezüglich der Mittellängsachse (7) angeordnet sind, wobei an den Wurfblechen (11) jeweils mindestens ein Lamellenhalter (19) zum Halten einer Lamelle (9) lösbar befestigt ist.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). Flammenschutzvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Wurfbleche (11) schaufelartig aufgeführt sind.Flame protection device according to claim 1, characterized in that the throwing plates (11) are arranged in a shovel-like manner. Flammenschutzvorrichtung gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass an jedem Wurfblech (11) mindestens eine Befestigungsleiste (24) angebracht ist, die zur Befestigung des Wurfblechs (11), insbesondere an einer Innenwand (22) der Trockentrommel (2) dient.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). Flammenschutzvorrichtung gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der mindestens eine Lamellenhalter (19) an einer Rückwand (27) des Wurfblechs (11) lösbar befestigt ist, wobei die Rückwand (27) insbesondere sich quer zu der Innenwand (22) der Trockentrommel (2) erstreckt und insbesondere in einer die Mittellängsachse (7) enthaltenden Ebene angeordnet ist.Flame protection device according to one of the preceding claims, characterized in that the 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). Flammenschutzvorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, dass der mindestens eine Lamellenhalter (19) mittels eines Haltewinkels (28) an der Rückwand (27) befestigt ist.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 angle (28). Flammenschutzvorrichtung gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass entlang der Mittellängsachse (7) mehrere Wurfbleche (11) hintereinander angeordnet sind, insbesondere fluchtend.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. Flammenschutzvorrichtung gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass ein Deckelelement (26) stirnseitig an einem Wurfblech (11) angebracht ist.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). Wurfblech für eine Flammenschutzvorrichtung gemäß einem der vorstehenden Ansprüche.Throwing plate for a flame protection device according to one of the preceding claims. Trockentrommel mit einer Flammenschutzvorrichtung gemäß einem der vorstehenden Ansprüche.Drying drum with a flame protection device according to one of the preceding claims.
EP23202571.8A 2022-10-20 2023-10-10 Flame protection device for a burner, flight for such a flame protection device and drying drum with such a flame protection device Pending EP4357524A1 (en)

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DE102022211109.5A DE102022211109A1 (en) 2022-10-20 2022-10-20 Flame protection device for a burner, throwing plate for such a flame protection device and drying drum with such a flame protection device

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DE102022211109A1 (en) 2022-10-20 2024-04-25 Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies Gmbh Flame protection device for a burner, throwing plate for such a flame protection device and drying drum with such a flame protection device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293228A (en) * 1979-10-29 1981-10-06 Cmi Corporation Drum for an asphalt mixing apparatus
US5083382A (en) * 1990-12-11 1992-01-28 Gencor Industries Inc. Adjustable flights with dams for rotary dryers
DE4243264A1 (en) * 1992-12-19 1994-06-23 Deutag Ag Continuous rotary furnace
US5515620A (en) * 1994-11-10 1996-05-14 Gencor Industries, Inc. Method and apparatus of rotatable drum dryer with flights releasably secured in different orientations
DE102017212046A1 (en) 2016-09-16 2018-03-22 Benninghoven GmbH & Co. KG Mülheim Plant and method for producing asphalt
US20220307205A1 (en) * 2021-03-25 2022-09-29 e5 Engineers, LLC Flight for Asphalt Rotary Dryer
DE102022211109A1 (en) 2022-10-20 2024-04-25 Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies Gmbh Flame protection device for a burner, throwing plate for such a flame protection device and drying drum with such a flame protection device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293228A (en) * 1979-10-29 1981-10-06 Cmi Corporation Drum for an asphalt mixing apparatus
US5083382A (en) * 1990-12-11 1992-01-28 Gencor Industries Inc. Adjustable flights with dams for rotary dryers
DE4243264A1 (en) * 1992-12-19 1994-06-23 Deutag Ag Continuous rotary furnace
US5515620A (en) * 1994-11-10 1996-05-14 Gencor Industries, Inc. Method and apparatus of rotatable drum dryer with flights releasably secured in different orientations
DE102017212046A1 (en) 2016-09-16 2018-03-22 Benninghoven GmbH & Co. KG Mülheim Plant and method for producing asphalt
US20220307205A1 (en) * 2021-03-25 2022-09-29 e5 Engineers, LLC Flight for Asphalt Rotary Dryer
DE102022211109A1 (en) 2022-10-20 2024-04-25 Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies Gmbh Flame protection device for a burner, throwing plate for such a flame protection device and drying drum with such a flame protection device

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