Rotary kiln seal system

Abstract

The invention relates to a rotary kiln seal system, comprising a seal disc which is designed to be secured to the exterior of a rotary tube. The seal disc has a first product side in a first axial direction and an atmosphere side in a second axial direction. The rotary kiln seal system additionally comprises an annular housing which is arranged on the seal disc. A first slide ring which is segmented along the circumference and has at least two segments is arranged on the housing, said slide ring being designed to contact the seal disc. The housing is equipped with at least one first connection system between the segments of the first slide ring, said connection system being designed to convey fluid into or out of the housing.

Description

[0001] Applicant:

[0002] EagleBurgmann Germany GmbH & Co. KG Äussere Sauerlacher Str. 6-10

[0003] 82515 Wolfratshausen

[0004] Rotary kiln sealing system

[0005] Description

[0006] The invention relates to a rotary kiln sealing system and an associated control unit.

[0007] Rotary kilns are rotating cylindrical kilns for continuous processes in process engineering and are used, for example, in cement production. A rotating rotary tube, within which high temperatures are present, must be sealed to a stationary housing of the rotary kiln. Rotary kilns can have a diameter of several meters and reach internal temperatures of over 1000°C. The processes in the rotary kiln often take place in the absence of oxygen. To increase efficiency or enable new processes, industry is placing increasing demands on the temperature resistance and sealing properties of the rotary kiln.

[0008] It is an object of the invention to provide an improved rotary kiln sealing system and an associated control unit that can be manufactured simply and cost-effectively.

[0009] This object is achieved by a rotary kiln sealing system having the features of claim 1 and a control unit having the features of claim 13.

[0010] The rotary kiln sealing system according to the invention with the features of claim 1 comprises a sealing disk which is designed to be fastened to an outer side of a rotary kiln. The sealing disk has a product side in a first axial direction and an atmosphere side in a second axial direction. Furthermore, the rotary kiln sealing system comprises an annular housing which is arranged on the sealing disk. A circumferentially segmented first slide ring with at least two segments is arranged on the housing and is designed to contact the sealing disk. In this case, at least one first connection system is arranged in an intermediate region in the housing between the segments of the first slide ring, which connection system is designed to convey a fluid in or out. The housing with the first slide ring is radially rigid and does not rotate.The first seal ring preferably seals the product side of the rotary kiln via the sealing disc and absorbs axial forces from the rotary kiln. A segmented seal ring is defined as a seal ring that is divided by at least one radial plane, with the center axis of the seal ring lying on the radial plane. Thus, the segmented seal ring enables simple and cost-effective manufacture and assembly of the rotary kiln sealing system. At the same time, the arrangement of the first connection system with at least one connection in the housing in the circumferential direction between two segments of the seal ring enables the fluid to be conveyed into or out of a sealing gap between the sealing disc and the seal ring, which can improve the sealing properties of the rotary kiln sealing system.

[0011] The fluid can be gaseous or liquid and can be used for sealing, flushing, lubricating, and / or cooling the rotary kiln sealing system. Nitrogen, for example, can be used as a sealing fluid. The segmented seal ring is preferably a bronze seal ring.

[0012] The subclaims show further preferred developments of the invention.

[0013] The rotary kiln sealing system preferably comprises a first sealing ring and a second sealing ring. The first sealing ring, the second sealing ring, the housing, and the sealing disc form an annular first chamber, with the first sliding ring arranged in the first chamber. The first and second sealing rings enhance the sealing properties of the rotary kiln sealing system. The arrangement according to the invention creates the first annular chamber, into which a fluid can be conveyed or discharged via the first connections in the first segmented sliding ring. Thus, the first chamber prevents product from escaping from the product side to the atmosphere side.

[0014] The sealing rings are preferably PTFE-impregnated packing sealing rings. More preferably, the sealing rings are pressed against the sealing disc via pressure rings. The required contact pressure for the sealing rings is preferably achieved by springs.

[0015] Further preferably, the first chamber is arranged on the product side of the sealing disc, so that the first chamber is directed directly towards the product to be sealed.

[0016] The rotary kiln sealing system preferably comprises a circumferentially segmented second seal ring with at least two segments, which is arranged on the housing and configured to contact the sealing disc on the atmosphere side. At least one second connection system is arranged in the housing between the segments of the second seal ring, in an intermediate region located in the circumferential direction, which is configured to convey a fluid in or out. Thus, the sealing disc is contacted by a segmented seal ring from the product side and the atmosphere side. The second seal ring improves the sliding properties of the rotary kiln sealing system.The second connection system allows another fluid to be conveyed into or out of the sealing gap between the atmosphere side of the sealing disc and the second sliding ring, so that the sealing properties of the rotary kiln sealing system are further improved and the penetration of air from the atmosphere side to the product side is prevented.

[0017] The rotary kiln sealing system further preferably comprises a third sealing ring and a fourth sealing ring, which are arranged on the atmosphere side of the sealing disc on the housing. The third sealing ring, the fourth sealing ring, the housing, and the sealing disc form an annular second chamber, with the second sliding ring arranged in the second chamber. The arrangement according to the invention creates the second annular chamber, into which a fluid can be conveyed or removed via the second connection system in the second segmented sliding ring. Thus, the second chamber additionally prevents the escape of a gas or product from the product side to the atmosphere side.

[0018] The second sealing ring, the third sealing ring, the housing, and the sealing disc preferably form an annular third chamber at a radially outer end, wherein the housing has at least one third connection system configured to convey a fluid into or out of the third chamber. Thus, the rotary kiln sealing system preferably has three chambers into which a fluid can be introduced via respective connection systems, preventing mass transfer between the product side and the atmosphere side.

[0019] Preferably, the fluids in the first chamber and / or the second chamber and / or the third chamber have different temperatures. Thus, for example, a cooled fluid can be introduced into the third chamber to cool the rotary kiln sealing system, thereby improving its temperature resistance. For example, a non-cooled fluid can also be introduced into the first chamber to avoid negatively affecting the process temperature in the rotary kiln.

[0020] More preferably, the fluids in the first chamber and / or the second chamber and / or the third chamber have different pressures. Thus, for example, a fluid can be drawn from the first chamber, while an overpressure exists in the second and / or third chamber, which prevents mass transfer between the product side and the atmosphere side.

[0021] Particularly preferably, the fluids in the first chamber and / or the second chamber and / or the third chamber are different. Thus, for example, a fluid can be introduced into one chamber to improve the sliding properties of the rotary kiln sealing system, while a sealing gas can be introduced into another chamber to improve the sealing properties of the rotary kiln sealing system. For example, a flushing fluid can be introduced into another chamber to prevent product from penetrating the rotary kiln sealing system.

[0022] According to a further preferred embodiment of the invention, the rotary kiln sealing system comprises a compensator, which is fixedly arranged on the product side of the housing and is designed to be attached to a housing component of a rotary kiln. Axial changes in the rotary kiln due to thermal expansion can be absorbed by the compensator. This allows axial forces transmitted from the rotary kiln to the rotating disk and the rotary kiln sealing system to be reduced, which has a positive effect on the durability of the rotary kiln sealing system.

[0023] Preferably, the first connection system and the second connection system are located on a common axis parallel to a center axis of the rotary kiln sealing system. This symmetrical alignment results in even loading of the sealing rings and slide rings on the product and process sides, thus resulting in even wear and lower maintenance costs.

[0024] Further preferably, the housing is U-shaped in cross-section, with recesses for accommodating sliding rings and / or sealing rings. The opening of the U-shaped cross-section faces radially inward.

[0025] Furthermore, the invention comprises a control unit which is configured to control each chamber of a rotary kiln system according to one of the preceding claims with a different pressure and / or a different temperature and / or a different fluid via at least one first fluid system and a second fluid system.

[0026] Further details, advantages, and features of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawings. It shows:

[0027] Fig. 1 is a schematic representation of a rotary kiln sealing system according to a preferred embodiment,

[0028] Fig. 2 is a schematic representation of a circumferentially segmented first sliding ring according to the preferred embodiment, and

[0029] Fig. 3 is a schematic representation of a circumferentially segmented second seal ring according to the preferred embodiment. A rotary kiln sealing system 1 according to a preferred embodiment of the invention is described in detail below with reference to Figures 1 to 3.

[0030] Figure 1 shows a rotary kiln sealing system 1 with a sealing disc 20, which is attached to a rotary tube 21 via a mounting flange 22.

[0031] The rotary kiln sealing system 1 seals a product side 23 of a rotary kiln to an atmosphere side 24, wherein the product side 23 is located in a first axial direction R1 of the sealing disc 20 and the atmosphere side 24 is located in an opposite second axial direction R2 of the sealing disc 20.

[0032] An annular housing 10 is arranged around the sealing disc 20. The housing 10 has a U-shaped cross-section that opens radially inward. The sealing disc 20 is arranged floatingly in the opening of the U-shaped cross-section, so that the sealing disc 20 is configured to rotate within the housing 10. The housing 10 is shown as a single piece, but can also be composed of multiple components.

[0033] The housing 10 is connected to a housing component 26 of the rotary kiln on the product side 23 via a compensator 25 to compensate for axial and radial movements of the rotary kiln 21, for example, due to thermal expansion. The compensator 25 is preferably a fabric compensator.

[0034] The mounting flange 22 is preferably welded to the rotary tube 21. Further preferably, the mounting flange 22 has bores for detachably connecting the sealing disc 20 to the mounting flange 22 via a screw connection, so that the sealing disc 20 can be easily replaced when worn.

[0035] The sealing disc 20 is aligned coaxially with a central axis X - X of the rotary tube 21. Preferably, the sealing disc 20 is made of a metal and has a constant thickness.

[0036] The housing 10 has a U-shaped cross-section that opens radially inward. Furthermore, the housing 10 is also aligned substantially coaxially with the central axis X-X of the rotary tube 21, with the sealing disc 20 being movable radially with the rotary tube 21 relative to the housing 10.

[0037] A first sealing ring 31, a second sealing ring 32, and a circumferentially segmented first sliding ring 11 are arranged within recesses in the housing 10 on the product side 23 of the sealing disc 20. The first sealing ring 31 is arranged radially inside the second sealing ring 32. Furthermore, the first sliding ring 11 is arranged radially between the first sealing ring 31 and the second sealing ring 32. The first sealing ring 31, the second sealing ring 32, and the first sliding ring 11 are designed to contact the sealing disc 20. Thus, a radial first chamber 41 is formed between the first sealing ring 31, the housing 10, the second sealing ring 32, and the sealing disc 20, which is sealed to the outside by the first sealing ring 31 and the second sealing ring 32. The segmented first sliding ring 11 is arranged within the first chamber 41.

[0038] On the atmosphere side 24 of the sealing disc 20, a third sealing ring 33, a fourth sealing ring 34, and a second slide ring 12 are arranged in recesses in the housing 10. The fourth sealing ring 34 is arranged radially inside the third sealing ring 33. Furthermore, the second slide ring 12 is arranged radially between the third sealing ring 33 and the fourth sealing ring 34. The third sealing ring 33, the fourth sealing ring 34, and the second slide ring 12 are designed to contact the sealing disc 20 on the atmosphere side 24. Thus, a radial second chamber 42 is formed between the third sealing ring 33, the housing 10, the fourth sealing ring 34, and the sealing disc 20, which is sealed to the outside by the third sealing ring 33 and the fourth sealing ring 34. The segmented second slide ring 12 is arranged inside the second chamber 42.

[0039] Furthermore, the second sealing ring 32, the third sealing ring 33, the housing 10 and the sealing disc 20 form an annular third chamber 43 at the radially outer end of the sealing disc 20. Thus, the product from the product side 23 must pass through the first sealing ring 31, the first chamber 41 with the first sliding ring 11, the second sealing ring 32, the third chamber 43, the third sealing ring 33, the second chamber 42 with the second sliding ring 12 and the fourth sealing ring 34 in order to reach the atmosphere side 24.

[0040] The housing 10 has a first connection system 14 on the product side 23, which is placed circumferentially between two segments 11a, 11b of the first sliding ring 11 and is designed to convey a fluid into or out of the first chamber 41.

[0041] On the opposite side of the sealing disc 20, a second connection system 15 is circumferentially positioned between two segments of the second sliding ring 12 in the housing 10. The second connection system 15 enables a fluid to be conveyed into or out of the second chamber 42.

[0042] On the axially outer side of the housing 10, a third connection system 16 is attached, which is designed to convey a fluid into or out of the third chamber 43.

[0043] Peripherally, one connection 17 or a plurality of connections 17 can be placed in the housing 10 per connection system 14, 15, 16. A plurality of connections 17 per connection system 14, 15, 16 enables a fluid circuit in a chamber 41, 42, 43, wherein the fluid is introduced through at least one connection 17 and sucked out through at least one other connection 17 in the respective chamber 41, 42, 43.

[0044] The first connection system 14 is connected to a first fluid system F1, which is configured to supply the first chamber 41 with an individual fluid having an individual pressure and / or individual temperature. The second connection system 15 is connected to a second fluid system F2, which is configured to supply the second chamber 42 with an individual fluid having an individual pressure and / or individual temperature. Furthermore, the third connection system 16 is connected to a third fluid system F3, which is configured to supply the third chamber 43 with an individual fluid having an individual pressure and / or individual temperature.The fluid systems F1, F2, F3 are connected to a control unit S which is configured to control fluid systems F1, F2, F3 in such a way that the correct amount of fluid with the correct chemical and physical properties is conveyed into or out of the chambers 41, 42, 43 in order to enable optimal sealing of the rotary kiln by the rotary kiln sealing system 1.

[0045] Figure 2 schematically shows the circumferentially segmented first sliding ring 11 according to the preferred embodiment. The first sliding ring 11 is annular and divided into four equally sized segments, namely a first segment 11a, a second segment 11b, a third segment 11c, and a fourth segment 11d.

[0046] The first connection system 14 comprises four connections, which are positioned circumferentially between the segments 11a, 11b, 11c, 11d and are configured to convey a fluid into or out of the first chamber 41 and the sealing gap of the first sliding ring 11. In the housing 10, the first sliding ring 11 is arranged substantially coaxially with the central axis X-X of the rotary tube 21, wherein the rotary tube 21 is arranged in a radially floating manner in the housing 10 via the sealing disk 20.

[0047] Thus, connections 17 are arranged at all free intermediate areas 18 located in the circumferential direction of the sliding ring 11.

[0048] The first connection system 14 is connected to the first fluid system F1, which is controlled by the control unit S in order to achieve a defined pressure and / or a defined temperature and / or a defined fluid in the first chamber 41.

[0049] Figure 3 schematically shows the circumferentially segmented second slide ring 12 according to the preferred embodiment. The second slide ring 12 is annular and divided into two equally sized segments, namely the first segment 12a and the second segment 12b, which are separated by the intermediate region 18. The second connection system 15 comprises two connections 17, which are positioned circumferentially between the first segment 12a and the second segment 12b in the intermediate space 18 and are designed to convey a fluid into or out of the second chamber 42 and the sealing gap of the second slide ring 12. In the housing 10, the second slide ring 12 is arranged essentially coaxially to the central axis X-X of the rotary tube 21, wherein the rotary tube 21 is arranged radially floating in the housing 10 via the sealing disk 20.Thus, for example, a fluid can be conveyed into the second chamber 42 via the upper connection 17 and conveyed out of the lower connection 17, thus forming a fluid circuit between the upper connection 17 and the lower connection 18 in the second chamber 42.

[0050] The second connection system 15 is connected to the second fluid system F2, which is controlled by the control unit S in order to achieve a defined pressure and / or a defined temperature and / or a defined fluid in the second chamber 42.

[0051] In addition to the above written description of the invention, reference is hereby explicitly made to the graphic representation of the invention in the figures for its supplementary disclosure.

[0052] List of reference symbols

[0053] I Rotary kiln sealing system

[0054] 10 housings

[0055] II First sliding ring

[0056] 11a First Segment

[0057] 11b Second segment

[0058] 11c Third Segment

[0059] 11d Fourth Segment

[0060] 12 Second sliding ring

[0061] 12a first segment

[0062] 12b second segment

[0063] 14 First connection system

[0064] 15 Second connection system

[0065] 16 Third connection system

[0066] 17 Connection

[0067] 18 Intermediate area

[0068] 20 sealing washer

[0069] 21 rotary kiln

[0070] 22 Mounting flange

[0071] 23 Product page

[0072] 24 Atmosphere page

[0073] 25 Compensator

[0074] 26 Housing component

[0075] 31 First sealing ring

[0076] 32 Second sealing ring

[0077] 33 Third sealing ring

[0078] 34 Fourth sealing ring

[0079] 41 First Chamber

[0080] 42 Second Chamber

[0081] 43 Third Chamber

[0082] F1 First fluid system

[0083] F2 Second fluid system

[0084] F3 Third fluid system

[0085] R1 First axial direction

[0086] R2 Second axial direction

[0087] S control unit

[0088] X - X center axis

Claims

Claims 1. Rotary kiln sealing system (1), comprising . a sealing disc (20) which is designed to be attached to an outer side of a rotary tube (21), wherein the sealing disc (20) has a product side (23) in a first axial direction (R1) and an atmosphere side (24) in a second axial direction (R2), . an annular housing (10) which is arranged on the sealing disc (20), and . a circumferentially segmented first sliding ring (11) with at least two segments (11a, 11b), which is arranged on the housing (10) and is designed to contact the sealing disc (20), . wherein in the housing (10) between the segments (11a, 11b) of the first sliding ring (11) at least one first connection system (14) is arranged, which is designed to convey a fluid in or out.

2. Rotary kiln sealing system (1) according to claim 1, wherein the rotary kiln sealing system (1) comprises a first sealing ring (31) and a second sealing ring (32), wherein the first sealing ring (31), the second sealing ring (32), the housing (10) and the sealing disc (20) form an annular first chamber (41), wherein the first sliding ring (11) is arranged in the first chamber (41).

3. Rotary kiln sealing system (1) according to claim 2, wherein the first chamber (41) is arranged on the product side (23) of the sealing disc (20).

4. Rotary kiln sealing system (1) according to claim 3, comprising a circumferentially segmented second sliding ring (12) with at least two segments, which is arranged on the housing (10) and is designed to contact the sealing disc (20) on the atmosphere side (24), wherein in the housing (10) between the segments of the second sliding ring (12) at least one second connection system (15) is arranged, which is designed to convey a fluid in or out.

5. Rotary kiln sealing system (1) according to claim 4, wherein the rotary kiln sealing system (1) comprises a third sealing ring (33) and a fourth sealing ring (34) which are arranged on the atmosphere side (24) of the sealing disc (20) on the housing (10), wherein the third sealing ring (33), the fourth sealing ring (34), the housing (10) and the sealing disc (20) form an annular second chamber (42), wherein the second sliding ring (12) is arranged in the second chamber (42).

6. Rotary kiln sealing system (1) according to claim 5, wherein the second sealing ring (32), the third sealing ring (33), the housing (10) and the sealing disc (20) form an annular third chamber (43) at a radially outer end, wherein the housing (10) has at least one third connection system (16) which is designed to convey a fluid into or out of the third chamber (43).

7. Rotary kiln sealing system (1) according to one of claims 2 to 6, wherein the fluids in the first chamber (41) and / or the second chamber (42) and / or the third chamber (43) have different temperatures.

8. Rotary kiln sealing system (1) according to one of claims 2 to 7, wherein the fluids in the first chamber (41) and / or the second chamber (42) and / or the third chamber (43) have different pressures.

9. Rotary kiln sealing system (1) according to one of claims 2 to 8, wherein the fluids in the first chamber (41) and / or the second chamber (42) and / or the third chamber (43) are different.

10. Rotary kiln sealing system (1) according to one of the preceding claims, comprising a compensator (25) which is fixedly arranged on the product side (23) on the housing (10) and is designed to be fastened to a housing component (26) of a rotary kiln.

11. Rotary kiln sealing system (1) according to one of claims 4 to 10, wherein the first connection system (14) and the second connection system (15) lie on a common axis parallel to a central axis (X - X) of the rotary kiln sealing system (1).

12. Rotary kiln sealing system (1) according to one of the preceding claims, wherein the housing (10) is U-shaped in cross section, with recesses for sliding rings (11, 12) and / or sealing rings (31, 32, 33, 34).

13. Control unit (S) which is configured to control each chamber (41, 42, 43) of a rotary kiln system (1) according to one of the preceding claims with a different pressure and / or a different temperature and / or a different fluid via at least one first fluid system (F1) and a second fluid system (F2).

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