WO1987003672A1 - Four tubulaire tournant - Google Patents

Four tubulaire tournant Download PDF

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Publication number
WO1987003672A1
WO1987003672A1 PCT/DE1986/000492 DE8600492W WO8703672A1 WO 1987003672 A1 WO1987003672 A1 WO 1987003672A1 DE 8600492 W DE8600492 W DE 8600492W WO 8703672 A1 WO8703672 A1 WO 8703672A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
rotary tube
conveyor
rotary
stripping
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.)
Ceased
Application number
PCT/DE1986/000492
Other languages
German (de)
English (en)
Inventor
Devender Dhingra
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1987003672A1 publication Critical patent/WO1987003672A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
    • F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
    • F26B11/0481—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum the elements having a screw- or auger-like shape, or form screw- or auger-like channels
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
    • C10B47/28—Other processes
    • C10B47/30—Other processes in rotary ovens or retorts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
    • C10B47/28—Other processes
    • C10B47/32—Other processes in ovens with mechanical conveying means
    • C10B47/44—Other processes in ovens with mechanical conveying means with conveyor-screws
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
    • F27B7/18—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being movable within the drum

Definitions

  • the invention relates to a rotary kiln or drum oven with conveying devices arranged in the interior of the rotary tube or in the interior of the drum.
  • Rotary tube furnaces are used in particular in the cement industry and for metallurgical processes and enable the continuous production of the desired products by solid reactions in a targeted gas atmosphere, which is generally conducted in countercurrent to the reaction material to be treated.
  • the rotary tube is arranged inclined with respect to the horizontal, so that the reaction material is gradually conveyed to the lower outlet end of the rotary tube under the influence of gravity and the rotary movement of the rotary tube.
  • DE-OS 29 44 693 describes a garbage pyrolysis rotary kiln, which is provided in the interior of the rotary tube with reversible fittings which are firmly connected to the rotary tube, so that it is possible even with the rotary tube in a horizontal position to effect the desired conveyance of the reaction material through the rotary tube, since the helical fittings firmly connected to the inside of the rotary tube form a transport spiral.
  • changes in the conveying speed can only be achieved by corresponding changes in the rotational speed of the rotating tube, so that there is still room for improvement.
  • baking of materials cannot be avoided in the case of the helical internals fixedly connected to the rotary tube, so that problems also arise in this regard.
  • DE-OS 26 42 294 describes a rotating vessel furnace, i. H. a rotary kiln, which is also provided with a transport spiral inside, which is fixedly connected to the rotary tube. This results in disadvantages similar to those already mentioned above.
  • the subject of DE-OS 25 38 356 is a heat treatment device with a cylindrical chamber, i. H. a rotary kiln, on the inner surface of the rotary tube a screw for material conveyance is arranged.
  • This screw can be moved freely on the fastening device relative to the inner surface of the rotary tube in order to avoid damage to the screw or the chamber due to the existing temperature differences. But it is determined by the fastening devices so that it can only be moved together with the rotary tube.
  • the heat treatment device designed in this way thus also recognizes the disadvantages mentioned above.
  • DE-OS 30 25 716 also describes a rotary kiln in which the material is conveyed along a spiral path during the heat treatment.
  • This path is formed by a rotatable, helical reaction tube which is arranged in the actual furnace. In this case, it is therefore a rotary kiln with a helical rotary tube.
  • This device too, is unsatisfactory due to the difficulties in the reaction material possibly sticking to the inner wall of the helical reaction tube and the fact that here too the reaction material cannot be conveyed independently of the speed of the rotary tube.
  • DE-OS 33 05 249 describes a device for carrying out the pyrolysis of a mixture of waste and coal in the form of a fixed tunnel kiln, the bottom surfaces of which are formed from a plurality of conveyor conveyors lying next to one another, in which screw conveyors are stored, which are stored convey the material through the tunnel oven and mix at the same time.
  • This device has the disadvantage that it is structurally very complex and does not allow the advantages of controlling the temperature distribution and the gas atmosphere of a rotary kiln.
  • the object of the present invention is now to overcome the disadvantages of the prior art mentioned above and to improve a rotary tube or drum oven of the type specified at the outset in such a way that a targeted passage of the reaction material through the rotary tube, an exact setting of the residence time , Any control of the speed of the rotary tube and the delivery rate as well as the treatment of sticky, pasty and also crusting masses is possible.
  • the invention thus relates to a rotary kiln with conveyor devices arranged in the interior of the rotary tube, which is characterized in that a conveyor screw which can be driven independently of the rotary tube is provided as the conveyor device.
  • This screw conveyor is preferably combined with a stripping screw which engages with the screw conveyor and strips off the reaction substance adhering to it and is driven together with the screw conveyor.
  • the screw conveyor and stripping screw have identical dimensions with regard to the ratio of length to diameter and the pitch of the screw winding as well as the cross-sectional shape of the individual screw flights.
  • the stripping screw is advantageously designed in such a way that it rests on the shape of the screw conveyor in order to ensure that the reaction material possibly adhering to the screw conveyor is completely stripped off.
  • the outer sides of these screws facing away from the area of engagement between the screw conveyor and stripping screw each rest on the inner wall of the rotary tube, in order in this way to keep the inner wall free of any adhering reaction material and to significantly improve the mixing and conveying of the To cause reaction goods.
  • the scraper screw can be arranged anywhere in relation to the screw conveyor, although it is preferred to provide it vertically above the screw conveyor, since this results in constructive advantages in terms of driving the two screws and a further improvement in mixing and conveying of the reaction material is effected in that the material stripped by means of the stripping screw from the inner wall of the rotary tube or from the surface of the conveyor screw falls back onto the conveyor screw and is further circulated and conveyed through the rotary tube.
  • the rotary kiln according to the invention is also preferably provided with devices with which the rotary tube can be driven independently of the screw conveyor and the screw conveyor, the rotary speeds of the rotary tube on the one hand or the conveyor screw and the screw conveyor on the other hand, so that it can be controlled independently is possible according to the invention, a targeted movement of the reaction material through the rotary tube with a corresponding. ' To effect residence time in the rotary kiln.
  • the material throughput through the rotary tube furnace can vary in a much broader range than was previously possible.
  • it is possible to divide the two screws into areas with different pitches in order to specifically influence the dwell times of the reaction mixture so that when using heating zones of different temperatures arranged outside the rotary tube, this becomes possible. to subject the material to targeted temperature / time cycles.
  • the arrangement according to the invention of a screw conveyor which can be driven independently of the rotary tube also enables the treatment of sticky, pasty or crusty material which could not previously be treated in rotary tube ovens.
  • the arrangement of the conveyor screw within the rotary tube also enables a substantially higher degree of filling of the rotary tube furnace, which enables a higher throughput with a shorter rotary tube length or drum length.
  • the screw conveyor in the form of a double screw with a stripping screw that can be driven together, a targeted transport of the material through the rotary kiln is also possible in the case of sticky, pasty. or viscous masses possible.
  • the design of the surfaces of the screw conveyor and stripping screw can further improve the mixing of the material and prevent the material from sticking to the screw conveyor, which means that tighter process parameters can be maintained.
  • the screw conveyor and the stripping screw from a heat-resistant material which is inert to the reaction participants to be treated in the rotary tube furnace, for example from a ceramic material, a heat-resistant inert metal or a corresponding metal alloy or the like.
  • FIG. 1 shows a schematic longitudinal section through a preferred embodiment of the rotary kiln according to the invention.
  • FIG. 2 is a sectional view of the rotary kiln shown in FIG. 1 along the line A-A.
  • the rotary kiln shown in FIG. 1 comprises a continuous rotary tube 1 which is surrounded by furnace windings 23 which are arranged within the furnace shell 15.
  • the furnace windings 23 can extend uniformly over the inner wall of the furnace shell 15, but can also be constructed differently or separately in order to enable reaction zones with different temperature conditions in the rotary tube 1.
  • a screw conveyor 2 and a stripping screw 3 are provided, which mesh with one another in the engagement area 4. In this way it is achieved that the eventual Any reaction material adhering to the screw conveyor 2 is stripped off the stripping screw 3 and can fall down.
  • the conveyor screw 2 and the stripping screw 3 are geometrically of the same design so that they can - if only partially shown - mesh with one another over the entire length in the furnace area.
  • the rotary kiln according to the invention has a screw conveyor 2 for the specific conveyance of the reaction material, it is not necessary to arrange the rotary tube inclined relative to the horizontal, so that a favorable horizontal arrangement of the entire device is possible.
  • the stripping screw 3 is arranged vertically above the screw conveyor 2, which has the advantage that the stripped in the engagement area 4 by the screw conveyor Reaction material can fall vertically downwards and is conveyed and circulated.
  • the screw conveyor 2, on the one hand, and the stripping screw 3, on the other hand, rest with their outer sides 5, 6 facing away from the engagement region 4 on the inner wall 7 of the rotary tube 1, so that the material possibly adhering there is also stripped off and moved further through the rotary tube.
  • the rotary kiln is provided with devices 8, 9, 10, 11, 12, 13 and 14 for independently driving rotary kiln 1 on the one hand and conveyor screw 2 and stripping screw 3 on the other.
  • the conveyor screw 2 is driven, which is coupled via the gear 12 to the stripping screw 3, so that both screws are connected turn at the same speed.
  • the chain 10 is also guided over the sprocket 21, with which the feed screw (not shown in more detail) is driven, which ensures that the reaction material to be treated is metered from the feed hopper 19 into the rotary tube 1.
  • the conveyor screw 2 and the stripping screw 3 are supported at their ends outside the furnace region in the shaft bearings 18, while the rotary tube 1 is supported in the rotary tube bearings 13 and 14 and is driven with the aid of a drive device, not shown.
  • the screw conveyor 2 and the stripping screw are designed in such a way that worm shafts 16 and 17 are arranged on the worm shafts 16 and 17, which run around the shafts and which are advantageously rolled onto a correspondingly shaped strip material Be produced outside of the shaft surfaces.
  • the reaction material introduced into the rotary tube 1 from the feed hopper 19 via the feed screw 20 is guided through the rotary tube with the aid of the screw conveyor 2 and the rotary movement of the rotary tube 1, any reaction material adhering to the rotary tube 1 or the screw conveyor 2 being stripped off by the stripping screw 3 becomes.
  • a targeted and freely controllable conveying speed of the reaction material through the rotary tube to the application device 22 is made possible.
  • the atmosphere required for the reaction is generated in the interior of the rotary tube, for example by blowing in an inert gas or a reaction gas in counterflow to the direction in which the reaction mixture is conveyed through the rotary tube.
  • the rotary kiln With the design of the rotary kiln according to the invention, it becomes possible to generate higher temperatures in the rotary tube, the outer tube being able to be rotated more quickly in order to avoid excessive temperature differences and / or damage to the rotary tube. Furthermore, by arranging the screw conveyor in the rotary tube, larger diameters of the rotary tube 1 are possible, which enables a higher throughput with consistently good reaction conditions. Finally, it is also possible to move the reaction material backwards or in a mitage step through the rotary tube by switching the conveyor screw, wherein specific movement conditions of the reaction material and thus targeted reaction conditions can also be set by reversing the direction of rotation of the rotary tube.
  • the arrangement of the stripping screw meshing with the screw conveyor 2 prevents the material from sticking to the conveyor device and the inside of the rotary tube, which in turn enables targeted reaction conditions and thus more uniform products.
  • the arrangement of differently designed and separately regulated furnace windings 23 enables reaction zones of different temperatures to be formed, with the corresponding operation of the conveyor screw 2 or the stripping screw 3 allowing targeted dwell times in the reaction zones concerned are.
  • the rotary kiln according to the invention is particularly suitable for the thermal treatment of sludge-like or pasty waste materials, for example tank residues, by thermal decomposition of these materials with the exclusion of air at temperatures in the range between approximately 350 ° C. and 650 ° C. for the recovery of energy or valuable Raw materials and to minimize residues and pollutants.
  • An essential feature of the teaching according to the invention is that the inevitable hindrance to transport through the furnace with such substances is achieved by adhesive phases which form with the aid of the screw conveyor and by the self-cleaning effect of the twin screw via the positive contact between the screw conveyor and the stripping screw becomes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

Un four tubulaire tournant comprend à l'intérieur du cylindre tournant des dispositifs convoyeurs. Une vis sans fin (2) peut être entraînée indépendamment du cylindre tournant (1) et est en prise de préférence avec une vis râcleuse (3) susceptible d'être entraînée en même temps qu'elle.
PCT/DE1986/000492 1985-12-03 1986-12-02 Four tubulaire tournant Ceased WO1987003672A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853542699 DE3542699A1 (de) 1985-12-03 1985-12-03 Drehrohrofen
DEP3542699.3 1985-12-03

Publications (1)

Publication Number Publication Date
WO1987003672A1 true WO1987003672A1 (fr) 1987-06-18

Family

ID=6287483

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1986/000492 Ceased WO1987003672A1 (fr) 1985-12-03 1986-12-02 Four tubulaire tournant

Country Status (3)

Country Link
EP (1) EP0248852A1 (fr)
DE (1) DE3542699A1 (fr)
WO (1) WO1987003672A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365851A1 (fr) * 1988-09-27 1990-05-02 Bison-Werke Bähre & Greten GmbH & Co. KG Séchoir à tambour à position horizontale pour matériau granulé
WO1994021977A1 (fr) * 1993-03-17 1994-09-29 Teles De Menezes Junior Antoni Four pour le traitement et le profit de la matiere organique et inorganique, par un procede a sec, et le procede respectif
WO2009127741A1 (fr) 2008-04-19 2009-10-22 Lwb Refractories Gmbh Four tubulaire rotatif doté d'un habillage réfractaire et garnissage pour un tel four tubulaire rotatif
WO2017004727A1 (fr) * 2015-07-09 2017-01-12 Ammann Schweiz Ag Tambour pour un sécheur à tambour pour la production d'asphalte

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3641731A1 (de) * 1986-12-06 1988-06-16 Babcock Anlagen Ag Vorrichtung zum waermebehandeln von zum anbacken neigenden guetern
US9624439B2 (en) * 2014-08-10 2017-04-18 PK Clean Technologies Conversion of polymer containing materials to petroleum products
CN118376052B (zh) * 2024-06-21 2024-08-30 山西达进活性炭科技有限公司 一种烘干转炉

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311824A (en) * 1941-04-30 1943-02-23 Arthur G Gautreau Drying apparatus
US2636284A (en) * 1948-07-12 1953-04-28 Miami Boiler & Machine Company Handling of materials and apparatus therefor
FR1540824A (fr) * 1966-10-18 1968-09-27 Handelsonderneming Ploum Fa Nv Procédé et installation pour le séchage thermique de substances à grain fin ou de boues, en particulier de boues très collantes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311824A (en) * 1941-04-30 1943-02-23 Arthur G Gautreau Drying apparatus
US2636284A (en) * 1948-07-12 1953-04-28 Miami Boiler & Machine Company Handling of materials and apparatus therefor
FR1540824A (fr) * 1966-10-18 1968-09-27 Handelsonderneming Ploum Fa Nv Procédé et installation pour le séchage thermique de substances à grain fin ou de boues, en particulier de boues très collantes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365851A1 (fr) * 1988-09-27 1990-05-02 Bison-Werke Bähre & Greten GmbH & Co. KG Séchoir à tambour à position horizontale pour matériau granulé
WO1994021977A1 (fr) * 1993-03-17 1994-09-29 Teles De Menezes Junior Antoni Four pour le traitement et le profit de la matiere organique et inorganique, par un procede a sec, et le procede respectif
WO2009127741A1 (fr) 2008-04-19 2009-10-22 Lwb Refractories Gmbh Four tubulaire rotatif doté d'un habillage réfractaire et garnissage pour un tel four tubulaire rotatif
DE102008019835A1 (de) 2008-04-19 2009-10-29 Lwb Refractories Gmbh Drehrohrofen mit einer feuerfesten Auskleidung und Zustellung für einen solchen Drehrohrofen
WO2017004727A1 (fr) * 2015-07-09 2017-01-12 Ammann Schweiz Ag Tambour pour un sécheur à tambour pour la production d'asphalte

Also Published As

Publication number Publication date
DE3542699A1 (de) 1987-06-04
EP0248852A1 (fr) 1987-12-16

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