WO2009127741A1 - Four tubulaire rotatif doté d'un habillage réfractaire et garnissage pour un tel four tubulaire rotatif - Google Patents

Four tubulaire rotatif doté d'un habillage réfractaire et garnissage pour un tel four tubulaire rotatif Download PDF

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Publication number
WO2009127741A1
WO2009127741A1 PCT/EP2009/054679 EP2009054679W WO2009127741A1 WO 2009127741 A1 WO2009127741 A1 WO 2009127741A1 EP 2009054679 W EP2009054679 W EP 2009054679W WO 2009127741 A1 WO2009127741 A1 WO 2009127741A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotary kiln
region
lining
refractory lining
furnace
Prior art date
Application number
PCT/EP2009/054679
Other languages
German (de)
English (en)
Inventor
Dirk Schmiedel
Johannes Hartenstein
Original Assignee
Lwb Refractories 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 Lwb Refractories Gmbh filed Critical Lwb Refractories Gmbh
Publication of WO2009127741A1 publication Critical patent/WO2009127741A1/fr

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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
    • F27B7/28—Arrangements of linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls

Definitions

  • the invention relates to a rotary kiln with a metallic housing, with a refractory lining for the protection of the metallic housing, wherein the refractory lining comprises a first region of furnace bricks and at least a second region of kiln bricks having a stronger necking affinity than the kiln stones of the first region and a delivery of refractory material for such a rotary kiln.
  • a rotary kiln is a long, refractory lined rotary kiln, in which a continuous production of desired products by a thermal treatment of the supplied
  • Rotary kiln have long been known from practice in a variety of designs.
  • a rotary kiln is an expensive capital equipment that is operated continuously. Usually this is called 24
  • the heat supply can be done in rotary kilns in two different ways. Here, a distinction is made between directly and indirectly heated rotary kilns. In directly heated rotary kilns, the heat is within the
  • Rotary tube for example, by a burner, wherein the reaction mixture comes into direct contact with the resulting flue gas.
  • indirectly heated rotary kilns the heat is transferred from outside the reaction chamber via the rotary kiln wall. In this method, a more specific specified product room atmosphere is possible.
  • an indirectly heated heat treatment device with a rotatable, cylindrical chamber is known.
  • a pair of helical strips are attached to the inner surface of the chamber.
  • a conveyor screw is positioned floating between the strips and held by them on the inner surface of the chamber. The feed screw, along with the rotational movement of the chamber, ensures that the feed material is continuously conveyed through the chamber.
  • the surface of the chamber is heated from the outside by an enclosing this heat chamber.
  • the attachment of the feed screw and the strip is associated with a certain assembly effort.
  • the strips are first tack-welded to the opposite sides attached to the screw and then permanently connected by continuous welding with the chamber jacket. Weldable material is thus required for the inner surface of the chamber as well as for the feed screw.
  • the surfaces of the conveyor screw running perpendicular to the chamber jacket provide a large attack surface for the conveyed material to be transported, so that the conveyor screw is exposed to great thermal, mechanical and chemical stresses during operation.
  • WO 87/03672 A1 describes an indirectly heated rotary kiln, which in its interior has a feed screw and stripper screw which can be independently driven by the rotary kiln and which scrapes off the reaction material adhering to the screw conveyor.
  • the rotary tube is surrounded by furnace windings, through which it is heated from the outside. Again, the assembly work is great due to the two intermeshing screws.
  • Unsatisfactory with this rotary kiln is that in case of major damage of the screws, the operation of the rotary kiln needs to be adjusted, which is associated with high costs.
  • the invention relates primarily to directly heated rotary kilns, for example for cement production, lime burning, waste incineration or
  • the refractory lining of the rotary kiln consists of a refractory brickwork of furnace bricks (lining) or unshaped refractory materials and is high during the operation of the rotary kiln, thermal and chemical exposed to mechanical stresses that often arise from the interactions between fuel, kiln and furnace housing. As a result of these loads occurring during operation, the refractory lining only has a relatively short service life.
  • the suspension of kiln operation caused by massive damage leads to very high costs such as material, personnel and repair costs, and above all costs due to lost production time.
  • a rotary kiln may be subdivided into various cylindrical zones in which different conditions, such as thermal conditions, prevail. Accordingly, different types of oven bricks are used for each zone. These are usually refractory bricks with different contents of MgO or CaO, for example magnesia spinel stones or dolomite-based bricks. These stones are characterized by their good refractory properties, their chemical resistance and their good thermal shock resistance. In addition, point
  • Dolomite-based refractory bricks have a high batch affinity and are therefore commonly used in the sintering zone of a rotary kiln.
  • the approach offers an additional protection against extreme stresses that can occur in this zone, for example due to chemo-thermal attacks of a cement clinker melt.
  • Oven stones of a rear zone in the rotary kiln a stronger approach behavior than the furnace stones of the previously arranged zone exhibit.
  • the projection acts as a "dam wall" tapering the inner clear cross-section, which holds the reaction material flowing through the rotary tube, such as clinker etc. Since the reaction material is difficult to overcome the transition region between the zones mentioned above, it rolls continuously in front of the zone of kiln stones with a strong batch affinity, thus creating reaction clusters in the transition areas which cause additional thermal, mechanical and chemical stresses and shorten the life of the kilns in these areas.
  • the residence time of the reaction material of a batch in the rotary kiln varies.
  • the parts of a batch are thus exposed to different mechanical, chemical and thermal influences and therefore often have different qualities.
  • a rotary kiln in such a design and further that a continuous flow of the reaction mixture can be ensured by the rotary tube and that the loads occurring, as explained above, are reduced.
  • a special delivery of refractory furnace bricks is desired.
  • the refractory lining has a lining pattern which is formed at least from the first and second region is and wherein the at least one contour of the second region extends obliquely to the longitudinal direction of the rotary kiln.
  • a substantially helical extension forms on the second region.
  • reaction material through the rotary tube.
  • reaction material is also transported over any obstacles on the inner surface of the refractory lining.
  • the lining pattern is repeated in the circumferential direction of the rotary kiln.
  • the transport of the reaction mixture is improved by the fact that several areas with furnace bricks of a strong batch affinity are available for transporting the reaction mixture.
  • a further embodiment of the invention provides that the lining patterns arranged in the circumferential direction of the rotary kiln form a strip-like overall pattern.
  • the lining patterns arranged in the circumferential direction of the rotary kiln form a strip-like overall pattern.
  • furnace stones of a further material are present in the boundary region of abutting regions.
  • the boundary areas which are often subject to greater voltages than the other areas during operation of the rotary kiln with
  • Furnace stones are made of a special, for example, a high-strength, lined material.
  • schaufei- or helical mold sections are formed obliquely to the longitudinal direction of the rotary kiln on the inner surface of the refractory lining. With these, the reaction mixture can be transported through the rotary kiln and lifted over any obstacles.
  • the furnace stones of the first region are essentially MgO-containing, for example magnesia spinel stones, and those of the second region essentially CaO-containing, for example kiln stones based on dolomite.
  • the greater batch affinity of the dolomite stones is utilized to achieve a desirable buildup in the second area during operation of the rotary kiln.
  • a step-like shoulder between the two areas, which promotes a driving of the reaction mixture through the rotary kiln forms.
  • the inner circumference of the rotary tube in the region of the schaufei- or helical shape sections on a wave-shaped cross-section. This improves the entrainment of the reaction material at a rotating in operation about its longitudinal axis rotary tube.
  • the mold sections for conveying the reaction product can be designed in different ways.
  • the mold sections are formed by coating. This forms in areas with the furnace stones of a strong batch affinity.
  • the coating is formed from the reaction mixture.
  • the mold sections can also be formed from projecting Ofenstein Letn. These may be, for example, areas in which the furnace stones have a greater height than the furnace stones of the adjacent areas. With this step-like paragraph between the areas a propulsion of the reaction material is supported by the rotary kiln.
  • the mold section may be formed according to a further teaching of the invention from a refractory guide element.
  • This is preferably made of a refractory material to withstand the thermal conditions in the rotary kiln.
  • the refractory guide element is another way to convey the reaction mixture through the rotary kiln.
  • FIG. 1 shows a section of a refractory lining of a rotary kiln according to the invention in longitudinal section;
  • FIG. 2 shows the object from FIG. 1 in a view onto the plane of the section line II - II in FIG. 1;
  • FIG. Fig. 3 shows a part of a refractory lining of a second embodiment of the rotary kiln in plan view of a part of a settlement and
  • Fig. 4 shows a part of a refractory lining of a third embodiment of the rotary kiln in plan view of a part of a settlement.
  • the refractory lining 1 of a (not shown) rotary kiln is formed from many furnace bricks 2 and 3, which are arranged in parallel juxtaposed rings 4. Likewise, a subdivision of the furnace stones 2 and 3 of the refractory lining 1 in rows 5 is possible, which extend in the longitudinal direction of the rotary kiln.
  • a sufficiently large inner diameter of the refractory lining 1 is formed to convey the reaction mixture through the rotary tube.
  • the inner circumference of the refractory lining 1 is therefore designed so large enough so that the areas of the refractory lining 1 are not continuously exposed to the loads by the reaction mixture.
  • the substantially parallel to the longitudinal axis of the rotary kiln surfaces of the furnace blocks 2 and 3 are preferably rectangular. Due to the radial course of the refractory lining 1, the visible decreases
  • Fig. 2 is a longitudinal half of a refractory lining 1 of a first embodiment of an inventive
  • the refractory lining 1 now has a first region 6 of furnace stones 2 and a second region 7 of furnace stones 3, the furnace stones 3 of the second
  • Region 7 have a stronger approach affinity than the furnace stones 2 of the first region 6.
  • the first region 6 and the second region 7 engage each other substantially in the longitudinal direction of the refractory lining 1 like a finger. They together form a lining pattern 8.
  • the lining pattern 8 is repeated over the circumference of the refractory lining 1 and thus forms a strip-like overall pattern 9, wherein in Fig. 1, only a part of the overall pattern 9 can be seen.
  • the lining pattern 8 is arranged at regular intervals over the circumference of the refractory lining 1. It can be seen a finger-like portion 10 of the second region 7, which extends substantially obliquely to the longitudinal direction of the refractory lining 1 of the rotary kiln.
  • the overall pattern formed from the lining pattern 8 acts as a propulsion device during operation of the rotary kiln according to the invention.
  • a deposit called "coating" is formed on the furnace stones 3 with a strong attack affinity of the second area 7.
  • the resulting heel on the contours 10 of the second area reliably ensures propulsion of the reaction material.
  • the second region 7 is delimited by an upper contour 11 and by a lower contour 12 and by a lateral contour 13.
  • Fig. 3 shows a refractory lining in a second embodiment, which is unwound for simplicity.
  • the lining pattern 8 ' is similar to that of Fig. 1.
  • the embodiment of Fig. 3 further furnace stones 20 in the boundary region between the first region 6' and the second region 7 '.
  • the second area 7 ' is delimited by a lower contour 11' and by an upper contour 12 'and by a lateral contour 13'.
  • the first boundary region 14 adjoins the lower contour 11 'and the second boundary region 15 adjoins the upper contour 13' of the second region 7 '.
  • the third boundary region 16 is arranged on the lateral contour 13 'of the second region 7' and in the illustrated embodiment has a further variety of furnace bricks 20 '.
  • the furnace stones 20, 20 'of all border areas 14 to 16 are preferably provided with a high-strength material, since they are exposed during operation of the rotary kiln greater loads than the other furnace stones 3.
  • the lining pattern 8 'of the refractory lining 1 of the rotary kiln according to the invention can be designed in many ways to achieve the desired effect of propulsion of the reaction material during operation.
  • FIG. 4 a developed part of a refractory lining 1 of a third embodiment is shown in FIG. 4.
  • the lining pattern 8 formed essentially of furnace blocks of the first region 6" and of the second region 1 "is configured in a different manner than in the exemplary embodiments described above.
  • the second regions 7 "represent island-like individual patterns.
  • the upper contour 12 "and lower contour H" of the second area 1 extendend essentially parallel to one another, the second area 1" in the illustrated lining pattern 8 "for each ring 4 having five oven blocks 3.
  • the lining pattern 8 '' is repeated over the circumference of the refractory lining 1. Due to the higher loads occurring during operation of the rotary kiln 1, also in this embodiment in the boundary region 19 between the first region 6 '' and the second region 1 '' 20 arranged from a high strength material.

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

Abstract

L'invention concerne un four tubulaire rotatif doté d'un caisson métallique, d'un habillage réfractaire (1) qui protège le caisson métallique, l'habillage réfractaire (1) présentant une première partie (6) en briques de four (2) et au moins une deuxième partie (7) en briques de four (3) qui présentent une plus forte affinité pour les dépôts que les briques de four (2) de la première partie (6), ainsi qu'un garnissage en habillage réfractaire (1) pour un tel four tubulaire rotatif. Pour garantir un écoulement continu du produit de réaction dans le tube rotatif et pour diminuer les sollicitations imposées par le produit de réaction, l'invention propose que l'habillage réfractaire (1) présente un motif (8) d'habillage qui est formé au moins de la première partie (6) et de la deuxième partie (7) et dans lequel au moins un contour (10) de la deuxième partie (7) s'étend obliquement par rapport au sens de la longueur du four tubulaire rotatif.
PCT/EP2009/054679 2008-04-19 2009-04-20 Four tubulaire rotatif doté d'un habillage réfractaire et garnissage pour un tel four tubulaire rotatif WO2009127741A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008019835.8 2008-04-19
DE102008019835A DE102008019835A1 (de) 2008-04-19 2008-04-19 Drehrohrofen mit einer feuerfesten Auskleidung und Zustellung für einen solchen Drehrohrofen

Publications (1)

Publication Number Publication Date
WO2009127741A1 true WO2009127741A1 (fr) 2009-10-22

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PCT/EP2009/054679 WO2009127741A1 (fr) 2008-04-19 2009-04-20 Four tubulaire rotatif doté d'un habillage réfractaire et garnissage pour un tel four tubulaire rotatif

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DE (1) DE102008019835A1 (fr)
WO (1) WO2009127741A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8967998B2 (en) 2011-05-05 2015-03-03 Magnesita Refractories Company Rotary kiln lining and method
CN113758271A (zh) * 2021-09-30 2021-12-07 华润水泥技术研发（广西）有限公司 一种旋迴炉耐火砖的砌筑方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2577662C1 (ru) * 2014-11-25 2016-03-20 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Футеровка вращающейся печи

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2538356A1 (de) 1974-09-06 1976-03-25 Pacific Scientific Co Waermebehandlungsvorrichtung mit sich frei bewegender foerderschraube und verfahren zur anordnung der foerderschraube in der vorrichtung
SU1191712A1 (ru) * 1984-01-03 1985-11-15 Всесоюзный Ордена Октябрьской Революции Научно-Исследовательский И Проектный Институт Алюминиевой,Магниевой И Электродной Промышленности Футеровка вращающейс печи
SU1234712A1 (ru) * 1984-07-30 1986-05-30 Всесоюзный Ордена Октябрьской Революции Научно-Исследовательский И Проектный Институт Алюминиевой,Магниевой И Электродной Промышленности Футеровка вращающейс печи
WO1987003672A1 (fr) 1985-12-03 1987-06-18 Devender Dhingra Four tubulaire tournant
SU1471039A1 (ru) * 1987-04-03 1989-04-07 Всесоюзный Научно-Исследовательский И Проектный Институт Алюминиевой,Магниевой И Электродной Промышленности Футеровка вращающейс печи
RU2049971C1 (ru) * 1992-12-10 1995-12-10 "Акционерное общество Всероссийский алюминиево-магниевый институт" Футеровка вращающейся печи
EP1262568A1 (fr) * 2001-05-31 2002-12-04 Corus Aluminium Voerde GmbH Four rotatif avec garnissage de protection à base d'aluminate d'un alcalin de terre
JP2003194317A (ja) * 2001-12-27 2003-07-09 Meidensha Corp 回転燃焼装置と加熱処理施設

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE114911C (fr) *
DE806226C (de) * 1948-05-10 1951-06-11 Oesterr Amerikan Magnesit Innenausmauerung fuer Drehrohroefen zum Brennen von basischem Gut
DE914831C (de) * 1952-02-15 1954-12-13 Didier Werke Ag Ausmauerung von Drehrohroefen
JPH01278469A (ja) * 1988-04-28 1989-11-08 Kawasaki Refract Co Ltd マグネシア−カルシア質耐火物
JP2881682B2 (ja) * 1995-05-17 1999-04-12 品川白煉瓦株式会社 ロータリーキルン焼成帯の内張り構造

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2538356A1 (de) 1974-09-06 1976-03-25 Pacific Scientific Co Waermebehandlungsvorrichtung mit sich frei bewegender foerderschraube und verfahren zur anordnung der foerderschraube in der vorrichtung
SU1191712A1 (ru) * 1984-01-03 1985-11-15 Всесоюзный Ордена Октябрьской Революции Научно-Исследовательский И Проектный Институт Алюминиевой,Магниевой И Электродной Промышленности Футеровка вращающейс печи
SU1234712A1 (ru) * 1984-07-30 1986-05-30 Всесоюзный Ордена Октябрьской Революции Научно-Исследовательский И Проектный Институт Алюминиевой,Магниевой И Электродной Промышленности Футеровка вращающейс печи
WO1987003672A1 (fr) 1985-12-03 1987-06-18 Devender Dhingra Four tubulaire tournant
SU1471039A1 (ru) * 1987-04-03 1989-04-07 Всесоюзный Научно-Исследовательский И Проектный Институт Алюминиевой,Магниевой И Электродной Промышленности Футеровка вращающейс печи
RU2049971C1 (ru) * 1992-12-10 1995-12-10 "Акционерное общество Всероссийский алюминиево-магниевый институт" Футеровка вращающейся печи
EP1262568A1 (fr) * 2001-05-31 2002-12-04 Corus Aluminium Voerde GmbH Four rotatif avec garnissage de protection à base d'aluminate d'un alcalin de terre
JP2003194317A (ja) * 2001-12-27 2003-07-09 Meidensha Corp 回転燃焼装置と加熱処理施設

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8967998B2 (en) 2011-05-05 2015-03-03 Magnesita Refractories Company Rotary kiln lining and method
CN113758271A (zh) * 2021-09-30 2021-12-07 华润水泥技术研发（广西）有限公司 一种旋迴炉耐火砖的砌筑方法

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