EP0056931B1 - Four à tambour rotatif - Google Patents

Four à tambour rotatif Download PDF

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Publication number
EP0056931B1
EP0056931B1 EP19810890207 EP81890207A EP0056931B1 EP 0056931 B1 EP0056931 B1 EP 0056931B1 EP 19810890207 EP19810890207 EP 19810890207 EP 81890207 A EP81890207 A EP 81890207A EP 0056931 B1 EP0056931 B1 EP 0056931B1
Authority
EP
European Patent Office
Prior art keywords
inner tube
tube
rotary kiln
burner
heat
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.)
Expired
Application number
EP19810890207
Other languages
German (de)
English (en)
Other versions
EP0056931A1 (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 peculiar to rotary-drum furnaces

Definitions

  • the invention relates to a rotary kiln with a rotatable outer tube, which encloses an inner tube at a radial distance and bears driving blades protruding against the inner tube for the material to be treated, and with a burner arranged on the front side of the furnace opposite the object to be fed, which is inserted into the counter to the object open inner tube opens.
  • driver blades are arranged in the area of the inner tube on the outer tube, which convey the bulk material up in the annular space between the inner and outer tubes, so that it can trickle again along the outer jacket of the inner tube. 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 then already cooled accordingly.
  • the invention is therefore based on the object to avoid these deficiencies and to improve a rotary kiln of the type described in such a way that the heat available from the hot gases flowing through the inner tube can be better utilized without the risk of overheating of the material to be treated through direct heat exchange between the hot gases and the kiln.
  • the invention achieves the stated object 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 can be achieved over the circumference of the tube in accordance with the uneven distribution of the bulk material layer.
  • 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 any contact of the flue gases with the bulk material.
  • 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 mounted, the guide device can be connected directly 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 which 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 longitudinal beams results in an advantageous transfer 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, a lower temperature difference occurring 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 used to a large extent, especially if the heat exchanger is in the region of dead zones with regard to the heat transfer to the bulk material.
  • the heat exchanger can be arranged in the area of the inner tube quadrant which is arranged upstream of the lower tube crown in the direction of rotation of the outer tube.
  • the bulk material guidance along the outer wall of the inner tube must inevitably 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 when the inner pipe is shortened compared 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 against 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 a radial distance on all sides.
  • this inner tube 3 is non-rotatable through the outer tube 2 guided, supported on the inner wall of the inner tube 3 side members 4. Because of the connection of these longitudinal beams 4 to the jacket of the inner tube 3, a stiffening results for the inner tube 3, 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 fins 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 tubes, where it is gripped by driving vanes 11 of the outer tube 2 and conveyed up along the inner jacket of the outer tube until it is carried by the driving blades 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 as possible over the circumference, which is indirectly heated by the hot gas stream through the inner tube 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. Due to 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 members according to FIG.
  • the longitudinal beams 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 easily be 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 part of the rotating outer tube 2, so that the drying and calcining process takes place through the direct heat transfer between the hot gases, which have already cooled in some cases, 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 a driver show.
  • 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 heat utilization, this is easily 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Claims (8)

1. Four tubulaire tournant comportant un tube extérieur tournant (2) qui entoure avec espacement radial un tube intérieur (3) et porte des pâles d'entraînement (11) destinées à la matière (10) à traiter et faisant saillie en direction du tube intérieur (3), ainsi qu'un brûleur (7) disposé sur le côté frontal du four qui est opposé à l'amenée (5) de matière et qui débouche dans le tube intérieur (3) ouvert en direction de l'amenée (5) de matière, caractérisé par le fait que le tube intérieur (3), ouvert d'un côté, est monté sans pouvoir tourner et porte le brûleur (7) sur sa paroi frontale (6).
2. Four tubulaire tournant selon la revendication 1, caractérisé par le fait que le tube intérieur (3) présente un dispositif directeur de l'écoulement de gaz chauds.
3. Four tubulaire tournant selon la revendication 1 ou 2, caractérisé par le fait que le tube intérieur (3) est appuyé sur des longerons (4) passant axialement à travers le tube extérieur (2) et, de préférence, refroidis par eau.
4. Four tubulaire selon l'une des revendications 1 à 3, caractérisé par le fait que dans le tube intérieur (3) est prévu un échangeur thermique pour l'air comburant ou pour le combustible du brûleur (7).
5. Four tubulaire selon la revendication 4, caractérisé par le fait que l'échangeur thermique est situé dans la région de celui des quadrants du tube intérieur qui est placé avant le sommet inférieur du tube dans le sens de rotation du tube extérieur (2).
6. Four tubulaire selon la revendication 4 ou 5, caractérisé par le fait que l'échangeur thermique est formé par le tuyau d'alimentation (8) du brûleur (7) en air comburant ou en combustible, qui passe à travers le four en direction longitudinale.
7. Four tubulaire selon la revendication 6, caractérisé par le fait que le tuyau d'alimentation (8) servant d'échangeur thermique est placé contre le tube intérieur (3), qui forme une partie de la paroi du tuyau.
8. Four tubulaire selon la revendication 6 ou 7, caractérisé par le fait que le tuyau d'alimentation (8) présente des ailettes radiales (9) dirigeant la chaleur.
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
AT33181A AT384100B (de) 1981-01-27 1981-01-27 Drehrohrofen
AT331/81 1981-01-27

Publications (2)

Publication Number Publication Date
EP0056931A1 EP0056931A1 (fr) 1982-08-04
EP0056931B1 true 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019218690A1 (de) * 2019-12-02 2021-06-02 Ibu-Tec Advanced Materials Ag Vorrichtung zur Herstellung von Partikeln

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5822881A (ja) * 1981-08-03 1983-02-10 川崎重工業株式会社 ロータリキルン
FR2720487B1 (fr) * 1994-05-30 1996-07-12 Inst Francais Du Petrole Four tournant de pyrolyse de déchets avec chauffage interne.
AT407671B (de) 1999-08-25 2001-05-25 Ragailler Franz Drehofen
DE102010063116A1 (de) * 2010-12-15 2012-06-21 Deutsches Zentrum für Luft- und Raumfahrt e.V. Solarstrahlungsempfängervorrichtung
CN102818449B (zh) * 2012-09-13 2014-05-21 伍耀明 一种真空回转窑及其应用工艺
CN111804021B (zh) * 2020-09-02 2020-12-08 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

Family Cites Families (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
DE2949479A1 (de) * 1979-12-08 1981-06-11 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zum trocknen und kalzinieren von schuettguetern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019218690A1 (de) * 2019-12-02 2021-06-02 Ibu-Tec Advanced Materials Ag Vorrichtung zur Herstellung von Partikeln

Also Published As

Publication number Publication date
DE3162540D1 (en) 1984-04-12
EP0056931A1 (fr) 1982-08-04
JPS57148177A (en) 1982-09-13
AT384100B (de) 1987-09-25
ATA33181A (de) 1987-02-15

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