EP1453936B1 - Coke oven door with a membrane made of at least two flexible layers - Google Patents

Abstract

A coke oven door (1) comprises a gas channel (5) completely surrounding the oven door and a membrane (3) fixed on the oven door and pressed in a spring-mounted manner against the chamber frame. The gas channel is fixed on a membrane consisting of at least two layers. An Independent claim is also included for an alternative coke oven door. Preferred Features: The membrane comprises two sheets, especially four thin sheets. The sheets (3', 3'', 3''') have different thicknesses. At least one sheet is made of heat- and corrosion-resistant material, and at least one sheet is a spring.

Description

The invention relates to a coke oven door with membrane, a coke oven door with circulating gas channel and membrane, and their use.

Such a door is out of the WO 01/30939 A2 known. The gas channel on the coke oven door creates a sealing system for preventing emissions and air inlets on coke oven chambers that reliably prevents both the escape of raw gases from the coke oven chamber and the air inlet into the coke oven chamber.

With the gas duct, it is important that the door sealing strips or door seal cutters of the gas duct lie over the entire area.

It is known that the chamber frame suffers a deformation in the sense of a deflection due to the effect of temperature in the vertical direction. There are numerous proposals to adapt the sealing strips of coke oven doors to these deformations. All of these solutions have the disadvantage that the spring travel is not sufficient to adapt to these deformations.

So will in the DE 41 03 504 C2 discloses a coke oven door in which a diaphragm with springs is pressed against the chamber frame. The problem with this arrangement is that the membrane must have sufficient material strength to withstand the contact forces to be able to record, ie the membrane must have a high mechanical strength. The membrane must not be damaged or destroyed during cleaning processes. On the other hand, the membrane must have sufficient deflection in the elastic region. These two conflicting requirements could not be met so far, so that the spring travel with appropriate mechanical strength of the membrane was not sufficient and had an unsatisfactory seal.

The invention has for its object to provide a coke oven available, the sealing strips have such a large spring deflection that they can adapt to all occurring deformations, so that at any time a complete seal is guaranteed. In addition, the sealing system should be retrofitted to existing coke oven doors even in tight spaces. The object of the invention is also to show the use of a coke oven door.

This object is solved by the features of claim 1 or 2. With regard to the use of the solution of the problem by claim 32.

Further developments take place according to the features of the subclaims.

The invention is based on two essential principles. On the one hand, the spring travel for the contact pressure of the gas channel as large as possible and the contact pressure in the longitudinal direction should be as uniform as possible, on the other hand, the springs on the gas channel to act such that the contact pressure of the outer door sealing strip greater or at least equal to the contact pressure, on the inner door sealing strip is, is. The seal between the gas channel and the coke oven door is ensured by a membrane which has such a large deflection capacity with sufficient mechanical strength to accommodate all deformations. The gas channel must be made so flexible that at each support point in about the same contact pressure of the outer door sealing strip of the gas channel is given.

Due to the flexibility of the membrane, it is possible to carry out a large deflection in the smallest space. Because of this property existing coke oven doors, which have very tight space in the area of the seal, can be retrofitted using the existing mounting options.

The design of the diaphragm in combination with the spring element and the resulting large travel is an invention in itself, i. this embodiment can be used without the gas channel with the known from the prior art sealing systems.

If e.g. an arrangement of the gas channel is not possible by the geometric conditions, the seal according to the invention can be made with all sealing systems known from the prior art. Due to the membrane with its high deflection capacity, a better sealing is ensured even with conventional sealing systems.

By sealing the invention, it is possible to compensate for all deformations of the chamber frame and the coke oven door, so that at any time a complete seal is guaranteed. When using the gas channel, the sealing system also has the in the WO 01/30939 A2 named advantages, ie a gas pressure equalization between the gas channel and the coke oven chamber and thereby causes a reduction in the raw gas pressure prevailing on the outer sealing strip.

According to the invention, the membrane consists of at least two directly superimposed layers. This embodiment has the advantage that the deflection capacity of the membrane in the elastic region is improved compared to a membrane which has the same total material thickness. Due to the elastic behavior of the diaphragm, the diaphragm returns to the starting position when the contact pressure is reduced by the spring element.

The membrane according to an embodiment of the invention is sandwiched from a plurality of materials. In this case, the membrane plate arranged towards the gas duct can be made corrosion-resistant, while the middle membrane sheet assumes the spring effect (eg spring steel) and the upper reinforces the spring pressure.

According to a further embodiment, the membrane consists of two sheets. The individual sheets have a higher elasticity than a single sheet, which corresponds in its wall thickness of the wall thickness of the two sheets and can move during deformation by the spring pressure against each other.

The membrane can also be designed in composite construction. In the simplest case, the two sheets are connected together in the sense of a composite system. This can e.g. by webs or by other materials, such. Plastics and / or adhesives take place. For these composite construction methods, the tar produced in the coking plant can also be used.

The individual sheets of the membrane may have a different material thickness. As a result, the membrane can be varied in its bending behavior in a wide range and optimally adapted to the respective requirements.

The individual sheets of the membrane can even be designed with a material thickness in the tenth of a millimeter range. In this embodiment, the membrane consists of many individual layers that can move against each other. This creates slip planes on the contact surfaces of the individual layers. The membrane thus becomes more flexible overall and has a larger elastic range. As a result, a greater spring travel is possible. This embodiment has the advantage that any damage to the individual membrane sheets due to the adhesive effect of the condensates (tar) are automatically sealed.

It is also possible that the door opening to perform sealing sheet of the membrane made of heat and corrosion resistant material and to perform the other sheets of the membrane accordingly so that the adequate deflection capacity of the membrane is ensured.

According to a further embodiment of the invention, at least one sheet of the membrane is formed as a spring. By this measure, the membrane contributes to the contact pressure of the spring elements.

The sheets forming the membrane may also be formed as molded parts. In this case, any known from the prior art Ausfihrungsformen of springs or membrane sheets are possible.

It is of course also possible to combine the individual sheets of the membrane with the aforementioned properties.

The membrane according to the invention can be combined with all known from the prior art spring elements. Due to its large deflection behavior, it adapts to all preset suspension travel.

It is also possible to carry out the membrane as a spring element. For this purpose, only one or more sheets of the membrane must be performed as a spring.

According to one embodiment, the spring element consists of a plurality of superimposed leaf springs, which are fastened together on the door plate above the membrane and press on the gas channel. So that the sealing edges can better adapt to the deformations, the leaf springs are designed segment by segment as individual springs.

Another possibility is to arrange on the door plate a holding element for receiving a push rod, which presses on the gas channel. The push rod may e.g. Pressed by disc springs, coil springs or hydraulically / pneumatically against the gas channel.

Another way to exert a contact pressure on the gas duct is to attach a spring plate resiliently to the door panel. In this embodiment, the spring plate itself can also be designed as a rigid element with low elastic properties and the actual spring travel are mainly caused by the resilient support.

The resilient holder can, for. B. by disc springs which are clamped to a screw executed. Another possibility is the attachment of a spring element on a spring bar. It is also possible to design a spring element such that it assumes the spring function of the plate springs or of the spring rod. This design has the advantage that only a single spring component that can perform both spring functions must be made.

By this arrangement, it is ensured that the gas channel is arranged in a spring system with a relatively large spring travel. The spring travel is composed of the spring travel of the spring element and the spring travel resulting from the resilient support of the spring element.

The membrane must be designed so that the membrane can follow this spring travel. On the other hand, the membrane must also have such a great spring action that it springs back into its original position. This of course applies to all spring components of the spring system.

According to the invention, it is now possible to bring a rigid "double seal" (gas duct) with a large spring travel to the door frame to the plant, the contact pressure over the entire length is the same.

With the spring systems described above, it is possible to generate any contact pressure with any distribution and spring characteristic, i.e., any desired spring pressure. On the outer and inner sealing strip of the gas channel any different or equal pressures can be provided. So z. B. different leaf springs are combined with each other such that the spring action increases with increasing spring travel; This can be adjusted either by a different shape or length of the leaf springs or by providing distances to the respective point of application of the spring.

The same possibilities are also available with the other spring systems. When using the systems with plungers, it must be ensured that the pressure applied by a corresponding pressure distribution bar is made uniform. In this case, the pressure distribution bar must be designed so flexible that an adaptation of the gas channel to the unevenness of the chamber frame is still possible.

The springs can have a desired adjustable bias by different clamping.

The springs can also be designed in composite construction. In this case, all known techniques can be used. Since the requirements of the composite construction in the membranes and springs in terms of flexibility match, the composite structures can be used for both the diaphragm and the spring elements accordingly.

The composite construction can also be carried out such that channels between the individual elements of the springs or the membrane arise. The channels can be carried out by introducing a corresponding medium as a cooling or heating channel. It is also possible to design the channels with an insulating material as an insulating layer.

The gas channel must be designed so that it can adapt to the bumps and deformations of the chamber frame. On the other hand, the gas channel must have such a large cross-section that the raw gas can be discharged without pressure accumulation. In any case, the gas channel is designed with an inner and an outer sealing strip. In the area of door seal cutting, the gas channel must be as flexible as possible. This is z. B. thereby possible that one carries out the wall of the gas channel in lesser material thickness or notches or bends in the region of the door seal and thereby increases the deflection capability in this area.

It is also possible to mount a door seal on the inner and outer sealing strip of the gas channel.

The gas channel can also consist of correspondingly shaped elements of the membrane or the springs (leaf springs).

A particular problem for the tightness of coke oven doors is the corners of the door. According to the invention it is proposed to make the membrane in the corner area in one piece, i. the individual layers of the membrane are made in one piece for the upper and lower regions, so that each results in a U-shape. The membrane, which seals the longitudinal sides of the coke oven door, is adapted to this U-shape. By this arrangement, the permanent gas-tightness of the membrane is ensured because the seams are located outside of the heavily loaded corner area.

The connection of the individual membrane parts can be done by welding. Due to the structure of the membrane of individual layers, the membrane can be connected such that the individual layers are arranged offset with their seams. Due to the overlap of the individual membrane layers in this area, a gas-tightness is achieved. Thus, in this connection region, the membrane has the same material thickness, the individual membrane sheets must be arranged "on impact". This collision can be carried out in different ways. In the simplest case, the individual membrane layers are cut at right angles and arranged abutting one another. It is also possible to push the individual membrane sheets diagonally toward one another. In addition, the edges of the individual membrane sheets can be made beveled, so that there is a so-called sharpened impact. Due to the diagonal design of the abutting edges, the sealing edge length is increased, while the bevel (sharpening) of the membrane layers increases the sealing surface.

Due to the membrane according to the invention with its layer structure, it is even possible to carry out the connection of the membrane in the corner region. In this embodiment, the individual membrane layers must have in their overlap region in the material thickness be mutually reduced such that the two overlapping layers together give the layer thickness of the single layer. This can be z. B. be made by beveling (sharpening) or by appropriate cutouts (step formations).

These compounds are additionally sealed by the tar contained in the crude gas, which settles in the cracks or gaps in case of gas intrusion, sealed. According to one development, tar can also be used in the production of the membrane as adhesive and sealant for the connection of the individual membrane layers.

In the embodiment of the membrane with plates in the tenth of a millimeter range, the individual membrane layers can be arranged overlapping in the connection area without further measures. It is sufficient to arrange the individual membrane sheets offset in the connection area.

Since the profile of the gas channel rests on the chamber frame and does not participate in any deformations on the travel, resulting in this area no or only low voltages. In the case of the gas duct, a miter can be provided in the area of the door corners. Since in this area the welds are exposed to only low voltages, any other type of connection can be selected. It is also possible to run the gas duct in the corner as a plug connection. A possible connector is shown in the drawing. The arrangement of connectors can also be provided at any point of the gas channel.

The sealing system according to the invention with membrane, gas channel and spring element is outstandingly suitable for retrofitting leaking coke oven doors. All existing kosmoforte doors on the market can be retrofitted. Also for retrofitting membrane of the invention can be used with the spring element with all known from the prior art sealing systems.

The abovementioned and the claimed components to be used according to the invention described in the exemplary embodiment are not subject to special conditions in terms of their size, shape, material selection and technical design, so that the selection criteria known in the field of application can be used without restriction.

Further details, features and advantages of the subject matter of the invention will become apparent from the following description of the accompanying drawings in which - preferred embodiments of the invention Koksofentüren are shown.

Figur 1

eine Teilansicht einer Koksofentür mit Gaskanal, Membrane und Blattfe- dern,

Figur 2

eine Ausführungsform mit Druckstößel und Tellerfedern,

Figur 3

eine Ausführungsform mit einem federnd gehaltenen Federelement,

Figur 4a u.

eine Ausführungsform mit einem Federelement, das aus einem Bauteil

Figur 4b

besteht,

Figur 5

eine Ausführungsform der Membrane in Verbundbauweise,

Figur 6

eine Ausführungsform, bei der das Federelement, die Membrane und der Gaskanal als ein Bauteil ausgeführt sind.

Figur 7

eine Ausführungsform des Gaskanals mit flexibler Türdichtschneide,

Figur 8

eine Ausführungsform der Figur 1, bei der eine Federkraft im Bereich der äußeren Türdichtleiste des Gaskanals vorliegt,

Figur 9

eine Ausführungsform des Eckbereichs des Gaskanals mit einer Steckverbindung,

Figur 10

eine Ausführungsform mit einem sehr großen Federweg.

In the drawing show:

FIG. 1

a partial view of a coke oven door with gas channel, membrane and leaf springs,

FIG. 2

an embodiment with plunger and disc springs,

FIG. 3

an embodiment with a resiliently held spring element,

FIG. 4a and FIG.

an embodiment with a spring element, which consists of a component

FIG. 4b

consists,

FIG. 5

an embodiment of the membrane in composite construction,

FIG. 6

an embodiment in which the spring element, the membrane and the gas channel are designed as one component.

FIG. 7

an embodiment of the gas channel with flexible door seal cutting edge,

FIG. 8

an embodiment of the FIG. 1 in which there is a spring force in the area of the outer door sealing strip of the gas channel,

FIG. 9

an embodiment of the corner region of the gas channel with a plug connection,

FIG. 10

an embodiment with a very large travel.

The FIG. 1 shows a partial view of a coke oven door 1 in the region of the circulating gas channel 5. On the door panel 2 of the coke oven door 1, a membrane 3 is fixed with a holding element 4. The holding element 4 has a chamfer 4a. The membrane 3 is made of three stacked sheets 3 ', 3 "and 3"'. At the outer region of the diaphragm 3, the gas passage 5 is arranged with an outer door seal blade 5a and an inner door seal blade 5b. The gas channel 5 has on the inner door sealing strip 5b on a chamfer 5c. On the holding element 4 are leaf springs 6, which are held by a holding element 7, respectively. The holding element 7 also has a bevel 7a. The leaf springs 6 press on a bar 8, which is attached to the membrane 3 in the region of the gas channel 5. The gas channel 5 is pressed by the leaf springs 6 against the chamber frame 9 of a coke oven chamber, not shown. As a result, the gas channel 5 is sealingly against the chamber frame 9. Movements by deformations of the chamber frame 9 and / or the coke oven door 1 are compensated by the leaf springs 6 such that the gas channel 5 is always pressed sealingly against the chamber frame 9. In this case, only a slight resistance to the leaf springs 6 is generated by the flexible membrane 3. The membrane 3 is able by the bevels 4a and 5c of the holding element 4 and the gas channel 5 able to follow the predetermined by the leaf springs 6 spring travel. The possible movements of the coke oven door 1 are indicated by the arrows A and B. The bevel 7a of the holding element 7 causes a larger lever arm and thus a greater spring travel of the leaf springs. 6

In the FIG. 2 another embodiment of the sealing system according to the invention is shown. On the door panel 2 with the diaphragm 3 and the holding element 4, a holder 11 for a push rod 10 is attached. On the plunger 10 disc spring columns 12 are provided which press the plunger 10 on the bar 8 as a pressure distribution bar and thus on the diaphragm 3 and the gas channel 5 and thus press the gas channel 5 against the chamber frame 9. The disc springs 12 are biased by self-locking nuts 13.

From the FIG. 3 shows that the gas channel 5 is pressed with a leaf spring 15 against the chamber frame 9. The leaf spring 15 is resiliently clamped to a screw 16, which is arranged on the holding element 4, with disc spring columns 17. Due to this resilient support a larger spring travel of the leaf spring 15 is possible.

The FIG. 4a shows a further embodiment of the sealing system according to the invention of the coke oven door 1 with a spring element, which is designed as a spring member 20. The spring member 20 presses on the bar 8 and the diaphragm 3 on the gas channel 5, which is thereby pressed against the chamber frame 9. By different depth clamping of the spring member 20 in a holding element 21 - according to double arrow A - can be the spring travel and the spring characteristic vary.

In FIG. 4b the same embodiment of the spring element is shown. By a screw 22, a bias voltage can be generated on the spring member 20 in addition.

In the FIG. 5 a membrane 25 is shown in composite construction. The membrane 25 consists of membrane sheets 26, 27, 28 and 29. The membrane sheets 27 and 28 are interconnected by webs 30. By the webs 30, the gap between the membrane plates 27 and 28 is designed as channels 31. Through the channels 31, a medium can be guided, so that the channels 31 are used as cooling or heating channels. It is also possible to provide the channels 31 and / or the interstices between the membrane sheets 26 and 27 and 28 and 29 with insulating material, so that the membrane 25 or at least a part of the membrane 25 acts as an insulating layer.

The FIG. 6 shows a membrane 40 with membrane plates 41 and 42. The membrane plates 41 and 42 are bent at right angles at its front end and clamped at its other end in such a way that the gas channel 5 results between the two right-angled bends. In the lower region of the right-angled bends, the membrane sheets 41 and 42 have bends 43. By these bends 43 creates a density cutting edge 43 ', which seals the gas channel 5 against the chamber frame 9. On the diaphragm 40 press leaf springs 44, 45, and 46. The leaf springs 44, 45 and 46 are of different lengths. By this measure increases with increasing deflection, the spring force.

From the FIG. 7 is the gas channel 5 with an outer door sealing strip 50 and an inner door sealing strip 51 can be seen. The inner door sealing strip 51 has at its lower end a Groove 52 on. Below the groove 52, the inner door sealing strip 51 is provided with a slope 54, so that there is a door seal cutting edge 56. The outer door sealing strip 50 has correspondingly at its lower end a groove 53 and a slope 55. The slope 55 extends beyond the wall thickness of the door sealing strip 50. This makes it possible to press with a spring force F directly on the door seal blade 57 and thus to achieve a more flexible adaptation to the chamber frame 9.

From the FIG. 8 shows that the membrane 3 and the leaf springs 6 are fixed to the holding element 4 on the door panel 2. The lowermost leaf spring of the leaf springs 6 is angled at its non-clamped end and presses punctiform or linear on the membrane 3 and the outer door sealing strip of the gas channel 5. The punctual or linear contact pressure of the leaf spring 6 can be increased adjustable that a Clamping wedge 60 is pushed between the individual leaf springs of the leaf springs 6.

In the FIG. 9 a corner region of the gas channel 5 is shown. The gas channel 5 is connected by nesting in the direction of arrow A in the corner. For this purpose, the right part of the gas channel 5 is inserted into an opening 64 of the left part of the gas channel 5. Through an opening 65 in the right part of the gas channel 5, an unhindered gas passage in the corner region of the gas channel 5 is possible. In accordance with exactly fitting design, an additional connection of the two parts of the gas channel 5 is unnecessary, since any gas leaks are remedied by the tar. It is also possible to use tar or another adhesive for the connection of the two gas channel parts.

Out FIG. 10 shows that a leaf spring 70 presses with a sliding surface 71 on the bar 8 and thus on the membrane 3 and the gas channel 5. In deformations of the coke oven door 1 and / or the chamber frame 9 in the direction of arrows A and B, the leaf spring 70 moves with its sliding surface 71 along the edge of the bar 8. The spring travel is composed of the spring travel of the leaf spring 70 and the spring travel itself by compressing the angle formed by the sliding surface 71 and the leaf spring 70 results as well as from the sliding path of the strip 8 on the Leitfläche71. The sum of these three spring travel results in a large total spring travel. On the inner door sealing strip 5b of the gas channel 5, a gap 72 is provided. During a movement of the coke oven door 1 in First, the outer door sealing strip 5a of the gas channel 5 comes to rest on the chamber frame 9. With further movement in this direction, the inner door sealing strip 5b of the gas channel 5 is brought into abutment and the gap 72 closes. As a result, the already large travel of this system is still increased. In an opposite movement of the coke oven door 1 in the direction of arrow A, the inner door sealing strip 5b of the gas channel 5 lifts off the chamber frame 9, while the outer door sealing strip 5a of the gas channel 5 still seals reliably.

LIST OF REFERENCE NUMBERS

1

Coke oven door

2

door panel

3

membrane

3 '

sheet

3 '

sheet

3 ''

sheet

4

retaining element

5

gas channel

5a

Door sealing strip

5b

Door sealing strip

5c

bevel

6

leaf springs

7

retaining element

8th

strip

9

Chamber frame 10 pushrod

11

bracket

12

Disc spring stacks

13

nuts

15

leaf spring

16

screw

17

Disc spring stacks

20

spring member

21

retaining element

22

screw

25

membrane

26

membrane sheet

27

membrane sheet

28

membrane sheet

29

membrane sheet

30

Stege

31

channels

40

membrane

41

membrane sheet

42

membrane sheet

43

angulation

43

seal edge

44

leaf spring

45

leaf spring

46

leaf spring

50

outer door sealing strip

51

inner door sealing strip

52

groove

53

groove

54

slope

55

slope

56

Door seal edge

57

Door seal edge

60

clamping wedge

64

opening

65

opening

70

leaf spring

71

sliding surface

72

gap

A

arrow

B

arrow

Claims (32)

1. A coke oven door (1) with a membrane which is fastened to the coke oven door (1) and can be pressed in sealing manner against the chamber frame with a spring element, characterised in that the membrane (3) consists of at least two flexible layers which lie directly one on the other and are displaceable relative to one another.
2. A coke oven door (1) according to Claim 1, characterised in that a gas duct (5) which substantially completely surrounds the oven door is fastened to the membrane (3) consisting of at least two flexible layers which are displaceable relative to one another and the gas duct is designed to be flexible such that it can adapt to the unevenness and deformations of the chamber frame.
3. A coke oven door (1) according to Claim 1 or 2, characterised in that the membrane (3) consists of two metal sheets.
4. A coke oven door (1) according to Claim 1 to 3, characterised in that the membrane (3) consists of at least four thin metal sheets with a material thickness in the range of tenths of millimetres.
5. A coke oven door (1) according to Claim 1 to 4, characterised in that the membrane (25) is made of a composite construction.
6. A coke oven door (1) according to Claim 1 to 5, characterised in that the metal sheets (3', 3" and 3"') have different material thicknesses.
7. A coke oven door (1) according to Claim 1 to 6, characterised in that at least one metal sheet consists of heat-resistant and corrosion-resistant material.
8. A coke oven door (1) according to Claim 1 to 7, characterised in that at least one metal sheet is formed as a spring.
9. A coke oven door (1) according to Claim 1 to 8, characterised in that the metal sheets are formed as shaped parts.
10. A coke oven door (1) according to Claim 1 to 9, characterised in that at least three metal sheets with properties in accordance with the preceding claims are combined together.
11. A coke oven door (1) according to Claim 1 to 10, characterised in that the gas duct (5) with membrane (3) can be pressed against the chamber frame (9) with known spring elements.
12. A coke oven door (1) according to Claim 1 to 11, characterised in that the spring element consists of leaf springs (6).
13. A coke oven door (1) according to Claim 12, characterised in that the leaf springs (6) are made of different lengths.
14. A coke oven door (1) according to Claim 12, characterised in that at least one space is provided between the leaf springs (6).
15. A coke oven door (1) according to Claim 12, characterised in that an angled section (43) is provided on at least one leaf spring in the front region.
16. A coke oven door (1) according to Claim 12, characterised in that a displaceable clamping wedge (60) is provided between the leaf springs (6).
17. A coke oven door (1) according to Claim 12, characterised in that set screws are provided on at least one leaf spring.
18. A coke oven door (1) according to Claim 1 to 11, characterised in that the spring element consists of pressure tappets (10) on which spring forces act.
19. A coke oven door (1) according to Claim 18, characterised in that a pressure distribution bar (8) is arranged beneath the pressure tappets (10).
20. A coke oven door (1) according to Claim 1 to 10, characterised in that the spring element consists of at least one plate spring column.
21. A coke oven door (1) according to Claim 1 to 11, characterised in that the spring element consists of a spring component (20) which is fastened to the door.
22. A coke oven door (1) according to Claim 21, characterised in that the spring component (20) is designed to be adjustable by a screw (22).
23. A coke oven door (1) according to Claim 1 to 11, characterised in that the spring element consists of a leaf spring (15) which is arranged resiliently on a screw (16).
24. A coke oven door (1) according to Claim 1 to 11, characterised in that a leaf spring (15) is fastened to a spring rod which is attached to the door.
25. A coke oven door (1) according to Claim 12, characterised in that individual ones of the leaf springs (6) are connected together by crosspieces.
26. A coke oven door (1) according to Claim 1 to 25, characterised in that cooling or heating ducts or insulating layers are provided on the membrane (3) and/or the spring elements.
27. A coke oven door (1) according to Claim 1 to 26, characterised in that the gas duct (5) is formed by the membrane (40) with the membrane sheets (41, 42).
28. A coke oven door (1) according to Claim 1 to 27, characterised in that grooves (52, 53) with inclines (54, 55) are provided on the gas duct (5) and the incline (55) with the door sealing edge (57) is designed to be able to be pressed against the chamber frame (9) by a spring force F.
29. A coke oven door (1) according to Claim 1 to 28, characterised in that the gas duct (5) in the corner region and externally is designed as a plug-in connection.
30. A coke oven door (1) according to Claim 1 to 29, characterised in that seals by means of tar are provided on the sealing surfaces of the membrane (3) and/or of the gas duct (5).
31. A coke oven door (1) according to Claim 1 to 30, characterised in that a sliding surface (71) is provided on a leaf spring (70) and the gas duct (5) has a gap (72) on its inner door sealing strip (5b).
32. Use of the coke oven door (1) according to Claim 1 to 31 for retrofitting existing coke oven doors.

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