EP0310509B2 - Verfahren zur Umgestaltung eines Drehrohrofens, insbesondere für die Zementproduktion - Google Patents

Verfahren zur Umgestaltung eines Drehrohrofens, insbesondere für die Zementproduktion Download PDF

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Publication number
EP0310509B2
EP0310509B2 EP88402457A EP88402457A EP0310509B2 EP 0310509 B2 EP0310509 B2 EP 0310509B2 EP 88402457 A EP88402457 A EP 88402457A EP 88402457 A EP88402457 A EP 88402457A EP 0310509 B2 EP0310509 B2 EP 0310509B2
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EP
European Patent Office
Prior art keywords
tube
cooler
kiln
oven
section
Prior art date
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Expired - Lifetime
Application number
EP88402457A
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English (en)
French (fr)
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EP0310509B1 (de
EP0310509A1 (de
Inventor
Michel Champonnois
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.)
Technip Energies France SAS
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Technip SA
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Publication date
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Application filed by Technip SA filed Critical Technip SA
Publication of EP0310509A1 publication Critical patent/EP0310509A1/de
Publication of EP0310509B1 publication Critical patent/EP0310509B1/de
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Classifications

    • 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 present invention essentially relates to a process for transforming a rotary kiln intended for example for the manufacture of cement and of the type consisting of a tube which is supported by bearing bearings and is provided at one of its ends with '' a planetary or balloon type cooler.
  • these ovens consist of an inclined sheet metal tube which has an interior refractory lining in bricks and which is rotated by appropriate means (WH DUDA, Cement Data Book, Vol. 1, Bauverlag GmbH, 1985, pages 312, 383, 389).
  • the crusting which occurs on the brick coating during firing and which is moreover essential, is relatively thin compared to an oven of smaller diameter, because the effect of vault is less. As a result, the crusting deteriorates all the more as In large diameter ovens, brickwork is highly stressed by the thermal load, and this much more than in the case of smaller diameter ovens.
  • this kind of rotary oven generally comprises bandages bearing on rollers or the like allowing the rotation of the oven.
  • the tires supported by the rollers tend to ovalize, so that the briquetting and crusting assembly is subjected to alternating mechanical forces which are all the more significant. that the oven is bigger.
  • the deformations or premature wear of the mechanical connections, and in particular of the bandage-tube connection contribute to reinforcing the ovalization of the oven at the level of the bandages, which consequently weakens the refractory lining of the oven.
  • the object of the present invention is to remedy these drawbacks by proposing a process for transforming a rotary kiln which makes it possible to achieve a kiln whose mechanical and briquetting strength and regularity of operation as well as its operation are clearly better and the ovalization of which in the cooking zone is greatly reduced if not eliminated.
  • connection of the section of tube of reduced diameter to the remaining and preserved part of the tube is effected by means of a conical part.
  • the aforementioned tube section forming the downstream part of the oven constitutes a zone for baking the material, while the remaining part of the tube forming the upstream part of the oven constitutes a preparation or precalcination zone.
  • a cooler and a precalcination system respectively at the downstream end and the upstream end of this oven and, according to yet another characteristic of this process, this cooler is grilled.
  • the reduction in the diameter of the cooking zone will advantageously stabilize the briquetting by reinforcing the vault effect which, associated with the increase in the speed of rotation of the oven, will promote the formation of crusting and better resistance over time. this, so that the brickwork will be, ultimately, better protected.
  • connection of the section of tube of reduced diameter to the remaining and preserved part of the tube is effected by means of a conical part.
  • the aforementioned tube section forming the downstream part of the oven constitutes a zone for cooking the material, while the remaining part of the tube forming the upstream part of the furnace constitutes a preparation zone.
  • a grid cooler and a precalcination system are installed, without integrating it in the oven, respectively at the downstream end and the upstream end of this oven.
  • the reduction in the diameter of the cooking zone will advantageously stabilize the briquetting by reinforcing the vault effect which, associated with the increase in the speed of rotation of the oven, will promote the formation of crusting and better resistance over time. this, so that the brickwork will be, ultimately, better protected.
  • an oven essentially constituted by an inclined rotary tube T in which the material flows in the direction of arrow F and which is internally heated downstream by a flame materialized by arrow G.
  • the tube T comprises a cooking or clinkering zone 1 forming the downstream section of the oven, which is of a smaller diameter than the upstream tube or section 2 constituting the zone for preparing or precalcinating the material.
  • the diameter of the downstream zone or section 1 can be between 4 and 5.1 meters, and its length can be between 20 and 60 meters.
  • downstream 1 and upstream 2 sections are connected by a conical part 3 having a half-angle at the top which can be between 4 and 7 degrees so as to allow briquetting with standard bricks.
  • Bandages 4, 5 and 6 have been shown surrounding the tube T and bearing respectively on rollers 7 thus allowing the rotation of the tube T which is driven in rotation by a motor M whose output shaft drives at least one pinion 8 meshing with a ring gear 9 secured to the upstream section 2.
  • the bandages 4 and 5 are arranged around the downstream section or cooking zone 1 while the bandage 6 is arranged around the upstream section or preparation area 2. It will be noted here that the middle part of the oven constituted by the connection part 3 is located in an area where the bending moment is minimum.
  • FIG. 1 There is shown diagrammatically at 10 in FIG. 1 a precalcination or preheater system which is not integrated into the furnace or tube T.
  • the precalcination of the material upstream of the oven the reduction of the diameter of the clinkering or cooking zone 1 to an internal diameter less than or equal to 5.1 m, and also the increase in the speed of rotation of the oven. will allow an increase in production.
  • This oven A with integrated cooler 11 can be part of a clinker cooking line with a nominal capacity of 3800 tonnes / day and have a total length of around 115 m and an internal diameter of 5.6 m.
  • the speed of rotation of furnace A before transformation was 2 revolutions / minute.
  • the cooler 11 is removed from the oven A, which cooler makes the operation of this oven very critical, and also removes the tube portion of oven A that is associated with the cooler.
  • a lightened oven B is thus obtained visible in FIG. 2, but whose load supported by the support located at the level of the central part of the oven is considerably increased, as shown by the arrows 12a and 12b in FIG. 2.
  • the curves represented under each oven A, B and T represent the intensity of the bending moment at several points distributed over the length of the ovens, it being understood that the arrows under the three curves have a proportional dimension the importance of the loads at each support point.
  • the oven B is sectioned substantially at its central part, and the sectioned downstream part, that is to say the left part in FIG. 2, is replaced, and it is replaced by a section of tube, which is section 1 of the oven T, which section is of a smaller diameter than that of the remaining part of the tube which is kept and which is connected to section 1.
  • the load on the central or central support of the oven T of the invention remains substantially identical to what it was on the corresponding support of the oven A, as shown by arrows 12a and 12c.
  • the load supported by the support of the reduced diameter section 1 at the level of the central part of the furnace has been reduced to a value much more low than for furnace B and substantially identical to the initial value of the load supported by the support at the level of the central part of furnace A used to carry out the transformation.
  • the downstream section 1 of the oven T corresponds to a reduction in the diameter of the downstream section of the oven A to a diameter of 5 m over a length of 43 m, the total length of the transformed oven obtained then being 90 m about.
  • connection cone 3 between the downstream section 1 of 5 m in diameter and the upstream section 2, the diameter of which is kept (5.6 m), has a half-angle at the top of 4.8 ° and a length of 3, 5 m.
  • this cone 3 is well located in an area where the bending moment is canceled (see curve at the bottom of Figure 2).
  • the rotation speed of the oven T is increased compared to that of the oven A from 2 revolutions / minute to 3.1 revolutions / minute, and the gear / crown drive train is not changed.
  • the speed of rotation of the oven which is increased compared to what it would be without modifying the diameter of the clinkering zone. or cooking, improves heat exchange in the upstream preparation area 2, while the material residence time is significantly reduced.
  • the thermal power available in the downstream clinkering zone is lower and the rate of precalcination of the material at the inlet of the furnace is therefore greater than it would be without modification of the diameter of the clinkerization zone.
  • the three bandages or supports 4, 5, 6 of the oven T are located respectively at 5 m, 34 m and 73.5 m from the downstream end of the section 1.
  • the loads on these supports, before the processing, were 1485 tonnes, 805 tonnes and 585 tonnes respectively. After transformation, these loads became respectively 494 tonnes, 813 tonnes and 625 tonnes, which made it possible to keep the civil engineering and the rollers or undercarriage of these supports.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)

Claims (4)

  1. Verfahren zum Umbau eines insbesondere für die Herstellung von Zement bestimmten und durch ein von Rollenabstützlagern (7) gebildeten und an einem seiner Enden mit einem Kühler (11) z.B. der planetarischen Bauart versehenen Drehofens (A), wobei dieses Verfahren derjenigen Gattung ist, die darin besteht, das Rohr zu verkürzen, indem man den Kühler (11) an dem Ende des Rohres und den ihm zugeordneten Rohrteil wegschafft, dadurch gekennzeichnet, dass es darin besteht :
    - dieses Wegschaffen durch wesentliches Erhöhen der durch das in der Höhe des Mittelteiles des Rohres gelegene Abstützlager (7) getragenen Last (12b) und durch wesentliches Beibehalten derselben mechanischen Ausrüstungen zum Tragen (7) und zum Drehantrieb (M, 8, 9) des Ofens durchzuführen,
    - das besagte Rohr (B) etwa in der Höhe seines Mittelteiles durchzuschneiden und
    - einen der Abschnitte des derart getrennten Rohres (B) durch wenigstens ein Rohrstück (1) kleineren Durchmessers als derjenige des verbleibenden Abschnittes (2) des Rohres (T), welchen man beibehält und der an das besagte Stück (1) angeschlossen ist, zu ersetzen, in der Weise, dass die durch das Abstützlager (7) des besagten Stückes (1) in der Höhe des besagten Mittelteiles getragene Last (12b) auf einen schwächeren Wert herabgesetzt wird, der etwa dem ursprünglichen Wert (12a) der durch das Abstützlager (7) in der Höhe des für den Umbau verwendeten Mittelteiles des mit dem Kühler (11) versehenen Ofens (A) getragenen Last (12a) gleich ist.
  2. Verfahren nach Anspruch 1 dadurch gekennzeichnet, dass die Verbindung des Rohrstückes (1) verminderten Durchmessers mit dem übrigen und beibehaltenen Teil (2) des Rohres (T) über einen kegelförmigen Teil (3) erfolgt.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das vorgenannte, den unterstromigen Teil des Ofens (T) bildende Rohrstück (1) einen Bereich zum Brennen des Materials bildet, während der übrige, den oberstromigen Teil des Ofens bildende Abschnitt (2) des Rohres (T) einen Vorbereitungs- bzw. Vorbrennungsbereich bildet.
  4. Verfahren nach einem der Ansprüche 1 bis 3, das darin besteht, dem Ofen (T) ohne sie in den Ofen einzuverleiben, einen Kühler und ein Vorbrennungssystem jeweils in der Höhe des unterstromigen Endes und des oberstromigen Endes dieses Ofens zuzuordnen, dadurch gekennzeichnet, dass der Kühler ein Kühler mit Gitter ist.
EP88402457A 1987-09-30 1988-09-28 Verfahren zur Umgestaltung eines Drehrohrofens, insbesondere für die Zementproduktion Expired - Lifetime EP0310509B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8713529A FR2621993B1 (fr) 1987-09-30 1987-09-30 Procede de transformation d'un four rotatif destine en particulier a la fabrication du ciment, four obtenu par ce procede et ligne de cuisson equipee de ce four
FR8713529 1987-09-30

Publications (3)

Publication Number Publication Date
EP0310509A1 EP0310509A1 (de) 1989-04-05
EP0310509B1 EP0310509B1 (de) 1992-01-15
EP0310509B2 true EP0310509B2 (de) 1995-12-13

Family

ID=9355386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402457A Expired - Lifetime EP0310509B2 (de) 1987-09-30 1988-09-28 Verfahren zur Umgestaltung eines Drehrohrofens, insbesondere für die Zementproduktion

Country Status (7)

Country Link
US (1) US4880379A (de)
EP (1) EP0310509B2 (de)
CA (1) CA1315095C (de)
DE (1) DE3867787D1 (de)
ES (1) ES2029722T5 (de)
FR (1) FR2621993B1 (de)
PT (1) PT88619B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934563A1 (de) * 1999-07-22 2001-01-25 Krupp Polysius Ag Verfahren zum Umbau einer aus Drehrohrofen und Planetenkühler bestehenden Anlage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996035092A1 (en) * 1995-05-01 1996-11-07 Conoco Inc. Apparatus for calcining petroleum coke

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR28679E (de) * 1925-03-18
US1727217A (en) * 1926-03-17 1929-09-03 Menno S Price Kiln
US2503686A (en) * 1946-06-05 1950-04-11 Overmander Machine Inc Aggregate drier
DE1783005A1 (de) * 1968-09-14 1971-03-18 Kanics Andreas Dipl Ing Verfahren und Vorrichtung zur Behandlung von kleinkoernigem oder pulverfoermigem Gut in einem Ofen
GB1414879A (en) * 1973-07-31 1975-11-19 Smidth & Co As F L Methods of and apparatus for burning pulverulent materials
DE2519458A1 (de) * 1975-05-02 1976-11-11 Polysius Ag Drehrohrofen
JPS6086374A (ja) * 1983-10-17 1985-05-15 株式会社神戸製鋼所 セメント原料焼成用ロ−タリキルン

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934563A1 (de) * 1999-07-22 2001-01-25 Krupp Polysius Ag Verfahren zum Umbau einer aus Drehrohrofen und Planetenkühler bestehenden Anlage
DE19934563B4 (de) * 1999-07-22 2008-02-21 Polysius Ag Verfahren zum Umbau einer aus Drehrohrofen und Planetenkühler bestehenden Anlage

Also Published As

Publication number Publication date
US4880379A (en) 1989-11-14
ES2029722T5 (es) 1996-05-16
PT88619A (pt) 1989-07-31
EP0310509B1 (de) 1992-01-15
PT88619B (pt) 1993-10-29
FR2621993B1 (fr) 1990-03-23
FR2621993A1 (fr) 1989-04-21
ES2029722T3 (es) 1992-09-01
DE3867787D1 (de) 1992-02-27
EP0310509A1 (de) 1989-04-05
CA1315095C (en) 1993-03-30

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