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EP4587771A1 - Joint pour four rotatif - Google Patents

Joint pour four rotatif

Info

Publication number
EP4587771A1
EP4587771A1 EP23768581.3A EP23768581A EP4587771A1 EP 4587771 A1 EP4587771 A1 EP 4587771A1 EP 23768581 A EP23768581 A EP 23768581A EP 4587771 A1 EP4587771 A1 EP 4587771A1
Authority
EP
European Patent Office
Prior art keywords
sealing surface
sealing
rotary tube
housing
seal
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.)
Pending
Application number
EP23768581.3A
Other languages
German (de)
English (en)
Inventor
Ralf Osburg
Jochen Altfeld
Constantin KIMMIG
Martin Uhde
Tommy SCHAFRAN
Peter RICKERT
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.)
ThyssenKrupp AG
Thyssenkrupp Polysius GmbH
Original Assignee
ThyssenKrupp AG
Thyssenkrupp Polysius 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
Priority claimed from LU103007A external-priority patent/LU103007B1/de
Application filed by ThyssenKrupp AG, Thyssenkrupp Polysius GmbH filed Critical ThyssenKrupp AG
Publication of EP4587771A1 publication Critical patent/EP4587771A1/fr
Pending legal-status Critical Current

Links

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 specially adapted for rotary-drum furnaces
    • F27B7/22—Rotary drums; Supports therefor
    • F27B7/24—Seals between rotary and stationary parts
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F27D2099/0078—Means to minimize the leakage of the furnace atmosphere during charging or discharging

Definitions

  • Rotary kilns are used, for example, in the cement industry.
  • the cement industry has high CCh emissions because, in addition to the CO2 from the fuel, CO2 from the starting material, such as lime, is also released during burning. Therefore, the current effort is to then separate the CO2 and not allow it to enter the environment.
  • One technology for this, the so-called oxyfuel technology relies on using oxygen that is as pure as possible for the process. The oxygen is converted into carbon dioxide, so that in the end the gas mixture would ideally consist of water and carbon dioxide. In practice, this cannot be achieved with this level of purity. However, every reduction of inert gas, for example nitrogen, ultimately reduces the effort required for separation. Therefore, any unwanted gas entry into the process is negative.
  • the housing includes the furnace head (or the furnace inlet).
  • the device can preferably also have two housings, one at each end of the rotary tube.
  • the rotary tube usually has a slight gradient of, for example, approx. 3 to 4%.
  • the rotary tube is rotatably connected to the housing in such a way that the flow of material is guaranteed.
  • the connection is usually very open (with a large compensation area, i.e. a loose connection) to compensate for movements of the rotary tube. It is essential that the solid stream and largely the gas stream are passed through the connection.
  • a rotary tube seal is arranged between the rotary tube and the housing.
  • the rotary tube seal conventionally means that as little of the cold ambient gases as possible can penetrate and thus cause cooling.
  • the rotary kiln seal is not part of the rotary kiln or the housing, but is simply its own separate component.
  • the rotary tube seal is arranged in a ring around the rotary kiln.
  • the first sealing surface is arranged opposite the third sealing surface and the second sealing surface is arranged opposite the fourth sealing surface.
  • the first sealing surface and the third sealing surface are ideally plane-parallel and the second sealing surface and the fourth sealing surface are ideally plane-parallel.
  • the ideal case therefore refers to the planned perfect optimal state.
  • the first sealing surface, the second sealing surface, the third sealing surface and the fourth sealing surface have the geometric shape of a circular ring, a truncated cone shell or a cylinder shell. For example, two have the shape of a circular ring and two have the shape of a cylindrical shell, or all four have the shape of a truncated cone.
  • Essentially perpendicular in the sense of the invention means that the angle is 90° ⁇ 7°, preferably 90° ⁇ 5°, particularly preferably 90° ⁇ 3°.
  • the rotary tube has a fifth sealing surface.
  • the rotary tube seal has a sixth sealing surface.
  • the first sealing surface and the fifth sealing surface are plane-parallel and the third sealing surface and the sixth sealing surface are plane-parallel.
  • the second sealing element is a sealing cord.
  • the device has force generating devices.
  • the force generating devices are arranged above the sealing elements in such a way that the sealing elements are pressed against the opposite sealing surface by the force generating devices.
  • each annular sealing element is in contact with a plurality of force generating devices.
  • a ring element can be arranged between the sealing element and the force generating device.
  • the ring element for example made of metal, ensures a flat distribution of the punctiform force generated by the force generating devices.
  • the ring element can be made in one piece, but also in several parts, in particular from two to 75 ring element components.
  • a force generating device can have a spring.
  • a force generating device can be screwably connected to the sealing surface, whereby, for example, wear of the sealing element can be compensated for by screwing it in. At the same time, the wear can then be observed via the position of the force generating device - the further the force generating device is positioned inwards, the more the sealing element is worn.
  • a control element can be arranged above the force generating devices, for example in Form of a rope or cable, which surrounds all force generating devices in a ring. The control element is designed to apply force to the force generating devices.
  • the third sealing surface and/or the fourth sealing surface has a first side element and a second side element.
  • the side elements are arranged in such a way that the sealing elements can be replaced after the side elements have been removed. This simplifies maintenance.
  • a removable side wall for example, can be viewed as a side element. This is particularly preferred for the sealing surface that runs coaxially to the rotary tube.
  • the side element is moved along the axis of rotation to release the sealing element so that it can be replaced. The side element is then brought back into position and thus fixes the sealing element.
  • the third sealing surface and/or the fourth sealing surface has a spacer element.
  • the spacer element can be designed, for example, as a ring, as a rope, as a pin, as a wear element or as balls.
  • the force is guided through the spacer element, which can reduce wear on the sealing elements.
  • centering can be achieved in relation to the spacer element and the sealing elements. The sealing element then only needs to be pressed with the force necessary for sealing.
  • the device has a pressing device.
  • the pressing device is firmly connected to the rotating tube.
  • the pressing device is connected via a force-generating pressing element to the third sealing surface or fourth sealing surface, which is essentially perpendicular to the axis of rotation of the rotary tube.
  • the device has a gas cooling device for cooling the third sealing surface and/or the fourth sealing surface.
  • the first sealing surface and/or the second sealing surface is preferably also cooled.
  • the temperature of the gases in the rotary tube typically exceeds 1000°C, so cooling can help improve sealing and reduce wear.
  • the cooling and the associated reduced temperatures also enable the use of other, less heat-resistant materials for the sealing elements.
  • the rotary tube seal is connected to counterweights via a cable.
  • the rotary tube seal is suspended and its weight is compensated for by the counterweight, so that the weight of the rotary kiln seal is at least not completely transferred to the rotary tube and/or the housing via the third sealing surface and/or fourth sealing surface.
  • the rotating tube direction can be connected to two counterweights via two cable pulls, preferably one each on the side of the rotating tube.
  • a dust outlet is arranged between the housing and the second sealing surface at the lowest position. This makes it possible to easily remove the dust discharged from the rotary tube.
  • the rotary tube seal has a dust outlet. This is preferred if the rotary tube seal encloses a very low-lying area. This makes it possible to easily remove the dust discharged from the rotary tube.
  • the device has an internal gas supply.
  • the internal gas supply is arranged in the area between the rotary tube, rotary tube seal and housing.
  • the internal gas supply serves in particular to stir up dust again and remove it from the area.
  • the internal gas supply can also only be operated in pulses, for example.
  • first sealing surface and/or the second sealing surface are designed to be screwed or welded in segments.
  • FIG. 2 shows a first example in which the first sealing surface 30 runs parallel to the furnace pipe 10 and the second sealing surface 40 runs perpendicular to the axis of rotation of the rotary pipe 10.
  • a fluid preferably a gas, for example air or carbon dioxide
  • the second sealing surface 40 is arranged at a distance from the housing 20. On the one hand, this allows the inclination of the rotary tube 10 (not shown here) to be compensated for.
  • the rotary tube seal 50 is arranged between the first sealing surface 30 and the second sealing surface 40.
  • the rotary tube seal 50 has a third sealing surface 60 which is arranged parallel to the first sealing surface 30 and a fourth sealing surface 70 which is arranged at right angles to the third sealing surface 60 and which in turn is arranged parallel to the second visible surface 40. If a wobbling movement of the rotary tube 10 now occurs, the third sealing surface 60 can move parallel to the first sealing surface 30, i.e. coaxially to the axis of rotation of the rotary tube 10, and at the same time the fourth sealing surface 70 can move perpendicular to the axis of rotation of the rotary tube parallel to the second sealing surface 40 .
  • the third sealing surface 60 has a spacer element 100, for example a steel cable.
  • the spacer element 100 can also serve for centering.
  • the spacer element 100 is therefore arranged in the example shown and preferably centrally in the third sealing surface 60.
  • Fig. 3 shows a second example, which differs from the first example in particular in that the first sealing surface 30 is placed as an annular disk on the rotary tube 10. Accordingly, the third sealing surface 60 is also arranged vertically.
  • the second sealing surface 40 is designed as a cylinder jacket and has a larger diameter than the rotary tube 10.
  • the pressing device 110 in this case can be designed, for example, as a compression spring or as a pneumatic cylinder in order to press the third sealing surface 60 against the first sealing surface 30.
  • the dust outlet is arranged in the rotary tube seal 50, preferably close to the lowest point of the interior space that is being formed.
  • FIG. 5 shows an example of a first sealing surface 30 and a third sealing surface 60 in detail, as shown in the first example in FIG. 2.
  • the fourth sealing surface 70 could also be constructed analogously in the second example shown in FIG.
  • a ring element 82 is arranged behind the sealing element 80, for example a metal band.
  • Force generating devices 84 for example springs, which can be screwed into the third sealing surface 60, press on the ring element 82. This punctual force is evened out via the ring element 82, so that the sealing element 80 is pressed evenly against the first sealing surface 30.
  • a gas supply 150 is shown, via which, for example, carbon dioxide or process gas can be introduced into the enclosed volume 140.
  • this creates an excess pressure in the enclosed volume 140 relative to the surroundings and to the furnace pipe 10, so that this introduced gas escapes in the event of a leak. This reliably prevents penetration, particularly of nitrogen, as far as possible.
  • a leak for example in the event of a defect in a sealing element, can be detected immediately based on the resulting gas flow through the gas supply 150.
  • FIG. 7 A fourth example is shown in FIG. 7, which differs in some points from the second example shown in FIG. 3.
  • the rotary tube seal 50 here has a very rough LI shape. While the third sealing surface 60 is designed as in the second example, the fourth sealing surface 70 only has one sealing element 80, the sealing element 80 being designed as a sealing cord. In order to prevent the sealing cord from sagging, especially on the underside, mineral wool 160 is arranged under the sealing cord.
  • a flexible surface element 170 is arranged between the fourth sealing surface 70 and the housing 20. This makes it possible to tilt the fourth sealing surface 70 against the second sealing surface 40 and at the same time creates a gas space through the combination of the sealing cord and the flexible surface element 170, which can be filled with a sealing gas, for example. At the same time, a good seal can also be achieved between the first sealing surface 30 and the third sealing surface 60 due to the U-shape in a compact design by the pressing device 110.

Landscapes

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

Abstract

L'invention concerne un dispositif comprenant un four rotatif. Le dispositif comprend un boîtier (20) et un tube rotatif (10), le tube rotatif (10) étant relié avec faculté de rotation au boîtier (20), et un joint de tube rotatif (50) étant disposé entre le tube rotatif (10) et le boîtier (20). L'invention est caractérisée en ce que le tube rotatif (10) présente une première surface d'étanchéité (30), et le boîtier (20) présente une deuxième surface d'étanchéité (40), ladite première surface d'étanchéité (30) et ladite deuxième surface d'étanchéité (40) étant agencées sensiblement perpendiculairement l'une par rapport à l'autre par rapport à une section transversale longitudinale à travers l'axe de rotation du tube rotatif (10). Le joint d'étanchéité de tube rotatif (50) est disposé entre la première surface d'étanchéité (30) et la deuxième surface d'étanchéité (40), et le joint d'étanchéité de tube rotatif (50) a une troisième surface d'étanchéité (60) et une quatrième surface d'étanchéité (70), la première surface d'étanchéité (30) étant disposée à l'opposé de la troisième surface d'étanchéité (60), et la deuxième surface d'étanchéité (40) étant disposée à l'opposé de la quatrième surface d'étanchéité (70).
EP23768581.3A 2022-09-16 2023-09-13 Joint pour four rotatif Pending EP4587771A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU103007A LU103007B1 (de) 2022-09-16 2022-09-16 Dichtung für einen Drehrohrofen
DE102022133988.2A DE102022133988A1 (de) 2022-09-16 2022-12-20 Dichtung für einen Drehrohrofen
PCT/EP2023/075123 WO2024056721A1 (fr) 2022-09-16 2023-09-13 Joint pour four rotatif

Publications (1)

Publication Number Publication Date
EP4587771A1 true EP4587771A1 (fr) 2025-07-23

Family

ID=88017978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23768581.3A Pending EP4587771A1 (fr) 2022-09-16 2023-09-13 Joint pour four rotatif

Country Status (2)

Country Link
EP (1) EP4587771A1 (fr)
WO (1) WO2024056721A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1192967B (de) 1961-08-26 1965-05-13 Beteiligungs & Patentverw Gmbh Abdichtung an Drehrohroefen
DE3114695A1 (de) 1981-04-10 1982-10-28 Krupp Polysius Ag, 4720 Beckum Vorrichtung zur abdichtung des spaltes zwischen drehrohrofen und einlaufgehaeuse
DE3644330A1 (de) 1986-12-23 1988-07-07 Burgmann Dichtungswerk Feodor Dichtung
DE3821517A1 (de) * 1988-06-25 1989-12-28 Basf Ag Vorrichtung zum andruecken eines den spalt zwischen zwei relativ zueinander sich bewegenden teilen abdichtenden dichtungsmaterials, beispielsweise bei einer drehtrommelanlage
DE3830678A1 (de) * 1988-09-09 1990-03-22 Veba Oel Entwicklungs Gmbh Drehrohr
DE4303298C1 (de) 1993-02-05 1994-02-10 Gutehoffnungshuette Man Sperrmediumdichtung für Drehrohröfen
DE19734381A1 (de) * 1997-08-08 1999-02-11 Hauni Maschinenbau Ag Dichtungsanordnung
DE102009058311A1 (de) 2009-12-15 2011-06-16 Polysius Ag Industrieofen mit einem Drehrohr
DE102018133566A1 (de) * 2018-12-21 2020-06-25 Eisenmann Se Drehrohrofen

Also Published As

Publication number Publication date
WO2024056721A1 (fr) 2024-03-21

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