EP0056931A1 - Four à tambour rotatif - Google Patents

Four à tambour rotatif Download PDF

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Publication number
EP0056931A1
EP0056931A1 EP19810890207 EP81890207A EP0056931A1 EP 0056931 A1 EP0056931 A1 EP 0056931A1 EP 19810890207 EP19810890207 EP 19810890207 EP 81890207 A EP81890207 A EP 81890207A EP 0056931 A1 EP0056931 A1 EP 0056931A1
Authority
EP
European Patent Office
Prior art keywords
inner tube
tube
burner
furnace according
rotary
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.)
Granted
Application number
EP19810890207
Other languages
German (de)
English (en)
Other versions
EP0056931B1 (fr
Inventor
Werner L. Dipl.-Ing. Kepplinger
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0056931A1 publication Critical patent/EP0056931A1/fr
Application granted granted Critical
Publication of EP0056931B1 publication Critical patent/EP0056931B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • 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
    • F26B11/028—Arrangements 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
    • 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
    • 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
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces

Definitions

  • the invention relates to a rotary kiln with a rotating outer tube, which encloses an inner tube at a radial distance and carries driving blades projecting against the inner tube for the material to be treated, as well as with a burner arranged on the furnace front side opposite the object to be placed, which burner in the against the object open inner tube opens.
  • the treatment times and treatment temperatures required must be observed, with the risk that the bulk goods in the calcining zone will overheat if the bulk goods to be treated have to be exposed to comparatively high drying temperatures beforehand.
  • the heat exchange between the hot gases and the countercurrent through the ring Space between the inner and outer tubes of the bulk material must be conveyed through the inner tube, whereby a good distribution of the bulk material over the outer jacket of the inner tube should be aimed at, so that the entire outer surface of the inner tube can be used for heat transfer of the inner tube arranged on the outer tube driver blades, which promote the bulk material in the annular space between the inner and the outer tube, so that it can trickle along the outer jacket of the inner tube again. Due to this heat transfer via the inner tube, overheating of the bulk material is avoided because the hot gas only comes into contact with the bulk material after it has emerged from the inner tube and has already cooled accordingly.
  • a rotary kiln with a fixed inner tube and a rotatably mounted outer tube is already known (DE-PS 112 045), but the purpose of the inner tube used is only to: restrict the combustion chamber so that the hot gases cannot flow unused through a combustion chamber that remains free. For this reason, the firing material is conveyed from one side into the annular space between the inner and the outer tube, while the hot gases flow into the annular space from the other side. Since there is an immediate heat transfer from the hot gas to the firing material, there is still a risk of the firing material overheating.
  • this known rotary kiln does not provide any suggestion of how to proceed in order to be able to take advantage of the uniform supply of heat from hot gases flowing through an inner tube due to a non-uniform heat requirement over the outer jacket of the inner tube.
  • the invention is therefore based on the object to avoid these deficiencies and to improve a rotary kiln of the type described above so that the heat supply of the hot gases flowing through the inner tube can be better utilized without the risk of overheating of the material to be treated have to accept an immediate heat exchange between the hot gases and the firing material.
  • the invention solves this problem in that the inner tube, which is open on one side, is non-rotatably mounted and carries the burner on its end wall.
  • the stationary inner tube makes it possible to adapt the heat supply to the heat requirement. Because certain areas of the inner tube can be subjected to the hot gas flow to a greater extent, so that an uneven heat distribution corresponding to the uneven distribution of the bulk material layer can be achieved over the circumference of the tube.
  • there is an improved utilization of the sensible waste heat of the hot gases it being possible to provide the inner tube over the entire length of the outer tube in order to avoid contact of the flue gases with the bulk material at all.
  • a stationary inner tube and a rotating outer tube according to the invention, special, surprising effects are achieved compared to the prior art.
  • there is a simple construction because the burner can be provided on the end wall of the inner tube which is open on one side and there are no connection difficulties between rotatable and non-rotatably held parts.
  • the inner tube has a guide device for the hot gas flow, the supply of heat can be ensured by simple means in accordance with the bulk material coating on the outer jacket of the inner tube. Since the inner tube is non-rotatably, the Leiteinrich tion directly connected to the inner tube. Baffles can be used to advantage for this purpose.
  • the inner tube can be mounted non-rotatably with respect to the rotating outer tube, a support that is independent of the outer tube must of course be provided. Particularly favorable conditions result when the inner tube is supported on longitudinal members guided axially through the outer tube, the zones that are dead with regard to heat transfer being particularly recommended for the longitudinal member guidance within the inner tube.
  • the inner tube can also be stiffened via these side members. The support and stiffening of the inner tube by the side members results in an advantageous removal of the forces that occur, so that the inner tube can be made comparatively thin-walled. This thin wall in turn supports the heat transfer through the tube wall, with a smaller temperature difference between the inner and outer wall. In order to keep the heat load on the side members low, these side members can advantageously be cooled with water which is conducted through pipes inside the members.
  • the non-rotatably mounted inner tube is given by the possibility of providing a heat exchanger for the combustion air or for the fuel of the burner in the inner tube.
  • the cable routing is easily ensured without constructive difficulties because there is no relative movement between the inner tube and the lines.
  • the sensible waste heat of the hot gases can be largely eliminated be used, especially if the heat exchanger is in the region of dead zones with respect to the heat transfer to the bulk material.
  • the heat exchanger can be arranged in the area of the inner tube quadrant that is arranged upstream of the lower tube crown in the direction of rotation of the outer tube.
  • the bulk material guide along the outer wall of the inner tube must be interrupted, so that the heat available in this area can be used by the hot gases to preheat the combustion air or the fuel for the burner.
  • the quadrant adjoining the lower apex of the inner tube in the direction of rotation of the outer tube is less suitable for accommodating the heat exchanger because the bulk material is carried along by the outer drum in this area and rests against the inner tube with a corresponding layer height.
  • the heat exchanger is formed by the burner's supply line for the combustion air or the fuel, which is led through the furnace in the longitudinal direction.
  • the supply line can be straight or helical. Since the supply line is also flowed around by the hot gases in the area of the outer pipe in the case of an inner pipe which is shortened in relation to the outer pipe, good preheating of the combustion air or the fuel can be ensured even in the case of a straight pipe run.
  • the supply line serving as a heat exchanger can rest on the inner tube, the inner tube being able to form part of the line wall.
  • the supply line therefore results in additional pipe stiffening, which in turn permits a thinner-walled construction.
  • radial heat-conducting fins can be provided on the supply line.
  • the rotary tube furnace shown in FIGS. 1 to 3 consists essentially of a rotating outer tube 2, which is mounted on rollers 1 and which encloses an inner tube 3 with radial spacing on all sides.
  • the inner tube 3 is non-rotatably supported on longitudinal beams 4 guided through the outer tube 2 and abutting against the inner wall of the inner tube 3.
  • the inner tube 3 has a stiffening which allows a special thin-walledness for the inner tube.
  • the inner tube, which is open towards the feed 5, has on its opposite end wall 6 a burner 7 which opens into the inner tube and whose supply line 8 for the combustion air is guided through the inner tube 3 and forms a heat exchanger.
  • heat-conducting ribs 9 are provided in the supply line, which protrude radially from the supply line 8 against the hot gas flow originating from the burner 7.
  • the bulk material 10 to be dried and calcined is conveyed inside the outer tube 2 into the ring area between the inner and outer tube, where it is gripped by driving vanes 11 of the outer tube 2 and is conveyed up along the inner jacket of the outer tube until it is carried by the driving vanes 11 onto the outer jacket of the inner tube 3 slips off and trickles down to the bottom of the outer tube again.
  • the arrangement is such that there is a layer of bulk material of the same thickness over the circumference, which is indirectly heated by the hot gas flow through the inner tube 3 and brought to the required treatment temperature. After the calcining process has been achieved, the calcined bulk material is discharged from the outer tube.
  • the supply line 8 serving as a heat exchanger can rest against the inner tube 3, which can also form part of the line wall, as can be seen in particular from FIG. 7. Because of the non-rotatably supported inner tube 3 on the longitudinal beams 4, different circumferential areas of the inner tube can be acted upon with the hot gases to different extents, which allows the heat supply to be adapted to the heat requirement in accordance with the distribution of the bulk material layer over the circumference of the inner tube.
  • the longitudinal members 4 are advantageously laid in zones which do not have any special requirements with regard to heat transfer. The heat load on the side members can be reduced by appropriate cooling. For this purpose, the longitudinal beams according to FIG.
  • the side members 4 are therefore provided with an insulating cover 14.
  • the desired hot gas flow can be forced in the area of the inner tube 3 by a guide device which can be easily accommodated in the stationary inner tube 3.
  • guide ribs should be sufficient to obtain an appropriate flow distribution.
  • the inner tube 3 extends only over a part of the rotating outer tube 2, so that the drying and calcining process takes place due to the direct heat transfer between the partially cooled hot gases and the bulk material 10.
  • the outer tube 2 is therefore also provided with a refractory lining 15 in this area.
  • the heat exchanger can also extend in this area of the direct heat transfer in which the outer tube 2 does not carry any driving vanes.
  • the bulk material therefore remains in a crescent-shaped area, as indicated in FIG. 2.
  • the inner tube 3 according to FIG. 4 has a length corresponding to the outer tube 2, so that the hot gas cannot come into contact with the bulk material. Because of the good use of heat, this is readily possible, with the advantage that the flue gases have no influence on the calcining process. In addition, the discharge of bulk particles by the hot gas flow is excluded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP19810890207 1981-01-27 1981-12-22 Four à tambour rotatif Expired EP0056931B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT331/81 1981-01-27
AT33181A AT384100B (de) 1981-01-27 1981-01-27 Drehrohrofen

Publications (2)

Publication Number Publication Date
EP0056931A1 true EP0056931A1 (fr) 1982-08-04
EP0056931B1 EP0056931B1 (fr) 1984-03-07

Family

ID=3487749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810890207 Expired EP0056931B1 (fr) 1981-01-27 1981-12-22 Four à tambour rotatif

Country Status (4)

Country Link
EP (1) EP0056931B1 (fr)
JP (1) JPS57148177A (fr)
AT (1) AT384100B (fr)
DE (1) DE3162540D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4462793A (en) * 1981-08-03 1984-07-31 Kawasaki Jukogyo Kabushiki Kaisha Rotary kiln and method of using such a kiln
FR2720487A1 (fr) * 1994-05-30 1995-12-01 Inst Francais Du Petrole Four tournant de pyrolyse de déchets avec chauffage interne.
AT407671B (de) * 1999-08-25 2001-05-25 Ragailler Franz Drehofen
CN102818449A (zh) * 2012-09-13 2012-12-12 伍耀明 一种真空回转窑及其应用工艺
CN111804021A (zh) * 2020-09-02 2020-10-23 广州初曲科技有限公司 一种混凝土环保污水渣液分离处理设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010063116A1 (de) * 2010-12-15 2012-06-21 Deutsches Zentrum für Luft- und Raumfahrt e.V. Solarstrahlungsempfängervorrichtung
DE102019218690A1 (de) * 2019-12-02 2021-06-02 Ibu-Tec Advanced Materials Ag Vorrichtung zur Herstellung von Partikeln

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB275222A (en) * 1926-07-27 1928-01-12 Albert Fritz Meyerhofer Improvements in and relating to furnaces
DE490799C (de) * 1929-03-20 1930-02-03 Albin Nilsson Drehrohrofen, bei dem mehr als die Haelfte des Ofenquerschnitts durch das Gut ausgefuellt ist
FR52791E (fr) * 1943-03-12 1945-06-01 Four pour traitements thermiques tels que grillage, torréfaction, cuisson, calcination ou carbonisation
FR1212037A (fr) * 1957-12-26 1960-03-21 Procédé et installation pour la fabrication du plâtre et produits de cuisson analogues
FR1256011A (fr) * 1960-02-01 1961-03-17 Procédé et installation pour la fabrication du plâtre
US4014106A (en) * 1975-06-20 1977-03-29 Bearce Wendell E Dryer
EP0030403A1 (fr) * 1979-12-08 1981-06-17 Metallgesellschaft Ag Procédé de séchage et de calcination de matériaux en vrac

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB275222A (en) * 1926-07-27 1928-01-12 Albert Fritz Meyerhofer Improvements in and relating to furnaces
DE490799C (de) * 1929-03-20 1930-02-03 Albin Nilsson Drehrohrofen, bei dem mehr als die Haelfte des Ofenquerschnitts durch das Gut ausgefuellt ist
FR52791E (fr) * 1943-03-12 1945-06-01 Four pour traitements thermiques tels que grillage, torréfaction, cuisson, calcination ou carbonisation
FR1212037A (fr) * 1957-12-26 1960-03-21 Procédé et installation pour la fabrication du plâtre et produits de cuisson analogues
FR1256011A (fr) * 1960-02-01 1961-03-17 Procédé et installation pour la fabrication du plâtre
US4014106A (en) * 1975-06-20 1977-03-29 Bearce Wendell E Dryer
EP0030403A1 (fr) * 1979-12-08 1981-06-17 Metallgesellschaft Ag Procédé de séchage et de calcination de matériaux en vrac

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4462793A (en) * 1981-08-03 1984-07-31 Kawasaki Jukogyo Kabushiki Kaisha Rotary kiln and method of using such a kiln
FR2720487A1 (fr) * 1994-05-30 1995-12-01 Inst Francais Du Petrole Four tournant de pyrolyse de déchets avec chauffage interne.
EP0685551A1 (fr) * 1994-05-30 1995-12-06 Institut Français du Pétrole Four tournant de pyrolyse de déchets avec chauffage interne
US5644997A (en) * 1994-05-30 1997-07-08 Institut Francais Du Petrole Waste pyrolysis rotary furnace with internal heating
AT407671B (de) * 1999-08-25 2001-05-25 Ragailler Franz Drehofen
US6244859B1 (en) 1999-08-25 2001-06-12 Franz Ragailler Rotary kiln
CN102818449A (zh) * 2012-09-13 2012-12-12 伍耀明 一种真空回转窑及其应用工艺
CN102818449B (zh) * 2012-09-13 2014-05-21 伍耀明 一种真空回转窑及其应用工艺
CN111804021A (zh) * 2020-09-02 2020-10-23 广州初曲科技有限公司 一种混凝土环保污水渣液分离处理设备

Also Published As

Publication number Publication date
DE3162540D1 (en) 1984-04-12
EP0056931B1 (fr) 1984-03-07
AT384100B (de) 1987-09-25
JPS57148177A (en) 1982-09-13
ATA33181A (de) 1987-02-15

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