Oven system for the heat treatment of products and method for operating such an oven system

Abstract

The invention relates to an oven system for the heat treatment of products and a method for operating such an oven system.

Description

[0001] The invention relates to an oven system for the heat treatment of products and a method for operating such an oven system.

[0002] The present invention relates in particular to a furnace system for the heat treatment of products, comprising a tunnel furnace. Tunnel furnaces, also known as continuous furnaces, are well-known and widely used industrial furnaces. Tunnel furnaces have a tunnel-like furnace chamber extending from a first end to a second end. The products to be heat-treated in the tunnel furnace, the so-called material to be processed, are transported through the furnace chamber from the first end to the second end. The first end of the furnace chamber, where the material to be processed is fed into the tunnel furnace, is also referred to as the furnace inlet, and the second end of the furnace chamber, where the material to be processed is removed from the tunnel furnace, is also referred to as the furnace outlet. Since the transport of the material to be processed through the tunnel furnace is continuous, tunnel furnaces are continuously operated industrial furnaces.For transporting the material to be fired, it is moved through the furnace chamber on means of transport, in particular carts, rollers, or conveyor belts. Tunnel furnaces have heating elements to treat the material to be fired with heat or temperature within the furnace chamber. Such heating elements are known, in particular, in the form of electrically powered elements or those powered by the combustion of oil or gas.

[0003] To protect the material being fired during the firing process in the furnace chamber, particularly from direct contact with flames, smoke, furnace gases, or direct heat radiation from the heating elements, it is known to store the material in so-called "saggarn" (firing cradles) during its transport through the furnace chamber. A saggar is a firing aid in the form of a receiving device designed to hold the material being fired. In particular, a saggar can be designed in the form of a vessel into which the material being fired can be received. A saggar can, for example, be in the form of a cassette, a box, or a bowl.

[0004] After the material being smelted is transported in a saggar through the furnace chamber of the tunnel kiln, the saggar, with the material it contains, is removed from the tunnel kiln's transport system at the kiln outlet. The material is then removed from the saggar, and the saggar is transported back to the kiln inlet. There, the saggar is reloaded with material and placed back onto the tunnel kiln's transport system, allowing it to begin another journey through the kiln.

[0005] To transport saggar from the furnace outlet to the furnace inlet, transport devices are known.

[0006] In general, appropriately designed furnace systems have proven effective. However, the return transport of the sawdust from the furnace outlet back to the furnace inlet presents a challenge. Depending on the amount of sawdust generated at the outlet, a highly variable quantity must be transported back to the inlet. While it would be possible to regulate the transport speed of the return transport device based on the amount of sawdust generated at the outlet, this would require a complex control system for the transport device.

[0007] The invention is based on the objective of providing an oven system for the heat treatment of products, by which saggar can be easily transported back to the oven inlet even with a fluctuating number of saggar accumulating at the oven outlet. In particular, the saggar should be easily and continuously transported back to the oven inlet even with a fluctuating number of saggar accumulating at the oven outlet, without the need for accumulation or buffering at the oven outlet. Specifically, the saggar should be transported back by a transport device without requiring any control of the transport device, especially its transport speed, depending on the number of saggar accumulating at the oven outlet.

[0008] To solve this problem, the invention provides a furnace system for heat treatment of products, comprising the following features: a tunnel furnace comprising the following features: a tunnel-like furnace chamber extending from a first end of the furnace chamber to a second end of the furnace chamber; first means of transport by means of which saggar can be transported from the first end of the furnace chamber to the second end of the furnace chamber through the furnace chamber; a transport device for transporting saggar, comprising the following features: the transport device extends from a first end of the transport device to a second end of the transport device; wherein the first end of the transport device is adjacent to the second end of the furnace chamber and the second end of the transport device is arranged adjacent to the first end of the furnace chamber; second means of transport by means of which saggar can be transported from the first end of the transport device to the second end of the transport device;wherein the second means of transport comprise a transport track on which the Saggar can be transported from the first end of the transport device to the second end of the transport device; and wherein the transport track comprises multiple lanes, each of which can be used to transport Saggar from the first end of the transport device to the second end of the transport device.

[0009] The problem according to the invention is solved in particular by the fact that the furnace system comprises a transport device designed according to the invention. The transport device comprises second transport means by means of which saggar can be transported from the first end of the transport device to the second end of the transport device. The second transport means comprise a transport track on which saggar can be transported from the first end of the transport device to the second end of the transport device. The transport track comprises several tracks, with saggar being transported on each of the tracks from the first end of the transport device to the second end of the transport device. Depending on the quantity of saggar arriving at the furnace outlet, a suitable number of tracks can be loaded with saggar to transport it back from the furnace outlet to the furnace inlet. This avoids the need for a complicated control system for the transport device.Rather, the transport device can, for example, always be operated at the same speed, and the necessary number of tracks are supplied with sawdust depending on the number of sawdust strands arriving at the furnace outlet. It is advantageous to provide a number of tracks on the transport track that is adapted to the possible fluctuation range in the number of sawdust strands arriving at the furnace outlet. For example, the transport track of the transport device can be designed so that even with the maximum number of sawdust strands arriving at the furnace outlet, they can be transported back to the furnace inlet by the transport device, in which case all tracks of the transport track are advantageously supplied with sawdust strands.

[0010] Preferably, the transport device runs outside the furnace chamber. For example, the transport device can run parallel to the tunnel furnace, preferably directly next to it. This allows the furnace system to be particularly compact and space-saving. Preferably, the transport device runs on one side, especially next to the tunnel furnace. This has the particular advantage that the sawtooth can be transferred very easily between the first transport elements of the tunnel furnace and the second transport elements of the transport device.

[0011] The first end of the transport device is adjacent to the second end of the furnace chamber, and the second end of the transport device is adjacent to the first end of the furnace chamber. "Adjacent" in this context means spatial proximity, particularly immediate spatial proximity. This proximity of the first end of the transport device to the second end of the furnace chamber has the advantage that slag removed from the second end of the furnace chamber can be transported to the first end of the transport device via the shortest possible route and placed there. Similarly, this proximity of the second end of the transport device to the first end of the furnace chamber has the advantage that slag removed from the second end of the transport device can be transported to the first end of the furnace chamber via the shortest possible route and placed there.

[0012] In a preferred embodiment, the tracks of the transport system run parallel to each other. In particular, the tracks of the transport system preferably run laterally parallel to each other. This has the particular advantage that the sawdust can be transferred from the first transport means to any track of the transport system by means of a corresponding transfer step. By having tracks running parallel to each other, and especially laterally parallel to each other, the furnace system can therefore be operated particularly efficiently, especially by transfer robots.

[0013] In a preferred embodiment, the tracks run directly adjacent to each other. In other words, the tracks running side by side connect directly to one another. This has the particular advantage that the transport device can be made very compact and space-saving. In particular, this also has the advantage that the transport device can be made very space-saving even with a high transport capacity of saw yarn.

[0014] In a preferred embodiment, the tracks run parallel to each other. This has the particular advantage that the saggar transported on each track of the transport path requires the same transport time from the first end of the transport device to the second end. This makes it particularly easy to determine or adjust the number of saggars transported by the device.

[0015] In a preferred embodiment, the saggar can be transported by the second transport means along a straight transport direction. In other words, the transport device is designed such that the saggar can be transported linearly, i.e., along a straight path. Such linear transport of the saggar by the transport device is particularly advantageous when the tunnel kiln is linear, since in this case the transport device and the tunnel kiln can be arranged very compactly directly next to each other.

[0016] In a preferred embodiment, the Saggar can be transported on each track independently of the transport of Saggar on the other tracks. The tracks are thus configured so that the transport of Saggar on one track does not interfere with the transport of Saggar on the other tracks of the transport device. Such an embodiment offers the particular advantage of high flexibility and safety of the transport device. If, for example, the transport of Saggar on one track is blocked, perhaps because a Saggar has become wedged on that track, the other tracks of the transport system can still be used for the return transport of Saggar.

[0017] According to a particularly preferred embodiment, the transport track of the second transport means is designed as a roller conveyor. As is known, a roller conveyor, also referred to as a roller conveyor, is a track-like conveying device in which goods can be transported via an arrangement of rollers. The rollers of a roller conveyor are arranged one behind the other in the transport direction with a rotation axis extending transversely to the transport direction, so that products to be transported via the roller conveyor roll over the rollers in one transport direction. The rollers can be driven, in particular, by a motor-driven chain drive. A particular advantage of a transport device designed as a roller conveyor is that the Saggar can be transported particularly easily and safely using such a roller conveyor.This allows the Saggar to be transported back from the oven outlet to the oven inlet particularly easily and safely by simply adjusting the rotational speed of the rollers.

[0018] According to a particularly preferred embodiment, the second transport means can be configured as a single roller conveyor. In other words, the second transport means are provided in the form of a single roller conveyor, with the roller conveyor defining the transport path. The roller conveyor or transport path is designed such that, according to the invention, it comprises several tracks, wherein, according to the invention, saggar can be transported on each of the tracks from the first end of the transport device to the second end of the transport device. By means of appropriately designed second transport means, saggar can be transported back from the furnace outlet to the furnace inlet particularly easily and effectively, without the transport device, and in particular its transport speed, having to be controlled in any way depending on the number of saggars arriving at the furnace outlet.Rather, according to the invention, it may be particularly preferred that the single roller conveyor comprises the tracks of the transport conveyor or that several tracks are formed on the transport conveyor or single roller conveyor, wherein Saggar can be transported on each of the tracks from the first end of the transport device to the second end of the transport device.

[0019] According to a particularly preferred embodiment, the tracks of the transport system, especially if the transport system is designed as a roller conveyor as described above, can be separated from one another by separating elements. These separating elements are designed such that the tracks are separated in such a way as to prevent unintentional movement of the sag yarn between the tracks or a change of track for the sag yarn. This separation of the tracks by separating elements therefore has the particular advantage that it prevents unintentional movement of the sag yarn between the tracks during its transport by the transport device. This also makes it possible, for example, to ensure that the sag yarn, as described above, can be transported on each of the tracks independently of the transport of the sag yarn on the other tracks.Corresponding separating elements can, for example, be provided in the form of baffles that encompass the transport device and separate the individual tracks from one another. If the second transport means are designed in the form of a roller conveyor, particularly a single roller conveyor, a particularly preferred embodiment allows the rollers to encompass the separating elements. In this embodiment, the rollers of the conveyor have a dual function: firstly, transporting the saggar, and secondly, separating the tracks of the transport conveyor. Such an embodiment therefore has the particular advantage of simplicity and compactness, since the separating elements are provided with the rollers. According to one embodiment, the rollers can have separating elements in the form of projections, particularly projections on the roller surface.These projections thus serve as an obstacle, preventing the Saggar from leaving the track and thereby separating the tracks. According to a particularly preferred embodiment, the rollers have separating elements in the form of discs, especially discs that are rotationally symmetrical to the axis of rotation of the rollers. These discs form a projection on the surface of the rollers that is rotationally symmetrical to the axis of rotation of the rollers. Insofar as the rollers encompass the separating elements, these are particularly preferably arranged one behind the other in the direction of transport. In other words, in this embodiment, the separating elements are arranged on the rollers such that they run one behind the other in the direction of transport, i.e., in the direction in which the Saggar are transported by means of the second transport means. This creates very simple and effective separation of the tracks on the transport surface.

[0020] In a preferred embodiment, the tracks can be dimensioned identically. In particular, the tracks can have the same track width. This has the particular advantage that the same saggar can be transported on each track.

[0021] If the second means of transport are configured as a roller conveyor, and in particular if they are configured as a single roller conveyor, it is preferable that the roller conveyor includes rollers for transporting the saggar, with the rollers running across all of the tracks. In other words, the roller conveyor is formed by the same rollers across its entire width. This has the particular advantage of a very simple roller conveyor design, since the same rollers can be used for the entire roller conveyor and for all tracks.

[0022] In a preferred embodiment, the transport track can be arranged in a single housing. This is particularly possible if the transport track is in the form of a roller conveyor, especially a single roller conveyor.

[0023] The tunnel kiln of the kiln system according to the invention can be designed according to tunnel kilns known from the prior art. In particular, the tunnel kiln can be designed as described above. Preferably, the tunnel kiln of the kiln system according to the invention has first transport means in the form of rollers. The first transport means can preferably be designed as a roller conveyor. In this respect, the tunnel kiln can preferably be designed in the manner of a roller kiln.

[0024] The tunnel kiln can, in principle, be heated by any heating element known from the prior art. Preferably, the tunnel kiln is heated by electric heating elements.

[0025] As is known from the prior art, the tunnel kiln can preferably be designed such that the sawdust can be removed from the kiln chamber at its second end, i.e., at the kiln outlet. For this purpose, removal devices known from the prior art can be provided, for example, removal robots or roller conveyors.

[0026] The furnace system according to the invention can comprise first transfer means by means of which saggar can be transferred from the second end of the furnace chamber to the first end of the transport device. Such transfer means are known from the prior art, for example, in the form of robots or roller conveyors. By means of such first transfer means, saggar can be removed from the furnace chamber at the furnace outlet, transported to the first end of the transport device, and transferred there to the second transport means, so that they can subsequently be transported by means of the second transport means to the second end of the transport device and thus to the furnace inlet.

[0027] Similarly, the furnace system according to the invention can comprise second transfer means by means of which saggar can be transferred from the second end of the transport device to the first end of the furnace chamber. Such second transfer means can also be provided, as is known from the prior art, for example in the form of removal robots or roller conveyors. By means of the second transfer means, the saggar can therefore be removed from the second end of the transport device and transported to the first end of the furnace chamber, i.e., the furnace inlet, and placed there onto the first transport means so that the saggar can then begin a new journey through the furnace.

[0028] During the transport of the Saggar from the second end of the transport device to the first end of the furnace chamber, they can be loaded with products to be treated in the tunnel furnace, as is known from the prior art.

[0029] The invention also relates to a method for operating an oven system for the heat treatment of products, comprising the following steps: for providing an oven system according to the invention; for providing sag yarn; transporting the sag yarn by means of the first transport means from the first end of the oven chamber to the second end of the oven chamber through the oven chamber; transporting the sag yarn by means of the second transport means from the first end of the transport device to the second end of the transport device.

[0030] As explained herein, the Saggar transported in the furnace room can be loaded with material to be fired, which can be treated with heat in the furnace room of the tunnel kiln.

[0031] The Saggar transported through the furnace chamber can be transferred from the second end of the furnace chamber to the first end of the transport device using the first transfer devices.

[0032] Furthermore, the Saggar can be transferred from the second end of the transport device to the first end of the furnace chamber using the second transfer means.

[0033] The inventive method is preferably operated continuously, particularly preferably in a closed loop. Particularly preferably, the saggar are transported continuously in a closed loop according to the inventive method, i.e., through the furnace chamber from the first end of the furnace chamber to the second end of the furnace chamber and then back to the first end of the furnace chamber by the second transport means.

[0034] As explained herein, according to a particularly preferred embodiment, it may be provided that when transporting the saggar by means of the second means of transport, the saggar are transported simultaneously on different tracks of the transport railway.

[0035] According to the invention, it has been found that the furnace system and the method according to the invention are particularly suitable for the heat treatment of powdered products. According to a preferred embodiment, the furnace system according to the invention is therefore intended for the heat treatment of powdered products.

[0036] Such powdered products can be provided, in particular, in the form of powdered cathode material (cathode active materials, CAM) or powdered anode material (anode active materials, AAM). According to the invention, it has been found that such powdered products, in particular, can be treated with heat with particular advantage using the furnace system and the method according to the invention.

[0037] The invention also relates to the use of the furnace system according to the invention for the heat treatment of powdered products, in particular for the heat treatment of powdered products in the form of the aforementioned powdered cathode material and / or powdered anode material.

[0038] Further features of the invention can be found in the claims, the figures and the associated figure description.

[0039] An embodiment of the invention is explained in more detail with reference to the attached figures and the following, associated figure description.

[0040] This shows Figure 1, highly schematic and not to scale, shows an embodiment of an oven system according to the invention in a top view; and Figure 2 shows a perspective view from an oblique angle above a section of the transport device of the oven system. Figure 1 .

[0041] The entire furnace system is in Figure 1 marked with reference numeral 1.

[0042] The furnace system 1 comprises a tunnel furnace 100, a transport device 200, first conversion device 300 and second conversion device 400.

[0043] The tunnel kiln 100 comprises a tunnel-like kiln chamber 101 extending from a first end 102 of the kiln chamber 101 to a second end 103 of the kiln chamber 101. Furthermore, the tunnel kiln 100 includes first transport means 104 in the form of a roller conveyor, by means of which saggar 105 can be transported from the first end 102 of the kiln chamber 101 to the second end 103 of the kiln chamber 101. The tunnel kiln 100 is thus designed as a continuously operated industrial kiln in the form of a roller kiln. The tunnel kiln 100 also has electrically operated heating elements, not shown in detail in the figures, by which products transported in the kiln chamber 101 can be treated or heated. Products can be transported linearly through the kiln chamber 101 by means of the first transport means 104, as shown in Figure 1 through arrow T1.

[0044] The transport device 200 of the furnace system 1 extends from a first end 201 of the transport device 200 to a second end 202 of the transport device 200. The first end 201 is adjacent to the second end 103 of the furnace chamber 101, and the second end 202 is adjacent to the first end 102 of the furnace chamber 101. The transport device 200 comprises second transport means 203 in the form of a single roller conveyor. By means of the second transport means 203, Saggar 105 can be transported from the first end 201 of the transport device 200 to the second end 202 of the transport device 200. The transport direction from the first end 201 to the second end 202 is again linear in the direction of arrow T2. As in Figure 1 It is easy to see that the transport direction T1 in the tunnel furnace 100 and the transport direction T2 in the transport device 200 are parallel and opposite to each other.

[0045] The roller conveyor of the second transport means 203 comprises rollers 204, which define a transport track 205. The transport track 205 comprises several lanes, namely, according to the exemplary embodiment, three lanes 206, 207, and 208. On each of the three lanes 206, 207, 208, Saggar 105 can be transported from the first end 201 of the transport device 200 to the second end 202 of the transport device 200. The rollers 204 of the roller conveyor run over all of the lanes 206, 207, 208 and are rotatably mounted on the outside of the two outermost lanes 206, 208. The rollers 204 can be driven by a motor-driven chain drive. The chain drive is arranged on both sides of the transport device 200 and, as shown in Figure 2 Each is covered by a housing 209. The chains of the chain drive are driven by an electric motor 210. The transport device 200 comprises several modules, one of which is in Figure 2shown and marked with reference numeral 211. Several such modules, each designed according to module 211, can be connected in series via flanges 212 to form the transport device 200. The connected modules thus form a single, compact housing.

[0046] Each of the rollers 204 of the roller conveyor of the second transport means 203 has two separating elements in the form of two uniformly spaced discs 213, rotationally symmetrical to the axis of rotation of the respective roller 204. The discs 213 are arranged on the rollers 204 such that they form the three separate tracks 206, 207, 208. The discs 213 of adjacent rollers 204 are arranged such that they run one behind the other in the transport direction T2, i.e., in the direction in which the Saggar 105 are transported by means of the second transport means 203. This forms the three tracks 206, 207, 208, separated by the discs 213, which have the same track width.

[0047] By structurally separating the three tracks 206, 207, 208 by means of the discs 213 on a single roller track, this results in an extremely compact design of the second means of transport 203.

[0048] Due to the identical track width, each of the tracks 206, 207, and 208 is dimensioned identically, with the tracks 206, 207, and 208 running directly adjacent to each other. The separation of tracks 206, 207, and 208 by means of the disks 213 simultaneously ensures that the Saggar 105 can be transported on each of the tracks 206, 207, and 208 independently of the transport of Saggar 105 on the other tracks 206, 207, and 208.

[0049] The first transfer elements 300 of the furnace system 1 allow Saggar 105 to be removed from the second end 103 of the furnace chamber 101 and transferred to the first end 201 of the transport device 200. Due to the immediate proximity of the first end 201 of the transport device 200 to the second end 103 of the furnace chamber 101, the first transfer elements 300 can be dimensioned to be particularly small.

[0050] Similarly, the second transfer elements 400 Saggar 105 can be transferred from the second end 202 of the transport device 200 to the first end 102 of the furnace chamber 101. Again, due to the immediate proximity of the second end 202 of the transport device 200 to the first end 102 of the furnace chamber 101, the second transfer elements 400 can be dimensioned to be particularly compact.

[0051] The first transfer units 300 and second transfer units 400 are each designed as robots according to the state of the art, which allow the Saggar 105 to be transferred automatically.

[0052] According to one embodiment of the inventive method, Saggars are first loaded with products to be heat-treated in the tunnel furnace 100 (in this embodiment, powdered cathode material, not shown) and then placed onto the first transport means 104 at the first end 102 of the furnace chamber 101 via the second transfer means 400. The Saggars 105 are then transported through the furnace chamber 101 by means of the first transport means 104, whereby the products are heat-treated in the furnace chamber 101. The Saggars 105 are arranged in stacks on the first transport means 104. At the second end 103 of the furnace chamber 101, the Saggars are removed from the furnace chamber 101 and the products are taken from the Saggars 105. The now empty Saggar 105 are transferred by the first transfer devices 300 from the second end 103 of the furnace room 101 to the first end 201 of the transport device 200.Depending on the number of Saggar 105 arriving at the second end 103 of the furnace chamber 101, a necessary number of Saggar 105 is transferred to one or more of the tracks 206, 207, 208. Thus, for example, if only a small number of Saggar arrive at the second end 103 of the furnace chamber 101, only one of the tracks 206, 207, 208 can be filled with Saggar, and if a larger number arrive, two or three of these tracks 206, 207, 208, or even one of the tracks 206, 207, 208, can be filled with a smaller number of Saggar 105. Figure 1 The scenario depicted is one in which tracks 207 and 208 are completely occupied with Saggarn 105 and track 206 is only partially occupied with Saggarn 105.

[0053] The Saggar 105 units, placed on tracks 206, 207, and 208 of the roller conveyor of the second transport device 203, are then transported by the roller conveyor to the second end 202 of the transport device 200. There, the Saggar 105 units are transferred from the second end 202 of the transport device 200 to the first end 102 of the furnace chamber 101 by means of the second transfer device 400 and are loaded with products to be processed in the tunnel furnace 100. A new furnace journey for the Saggar 105 units can then begin.

Claims

1. Furnace system (1) for the heat treatment of products, comprising the following features: 1.1 a tunnel furnace (100), comprising the following features: 1.1.1 a tunnel-like furnace chamber (101) extending from a first end (102) of the furnace chamber (101) to a second end (102) of the furnace chamber (101); 1.1.2 first means of transport (104) by means of which saggar (105) can be transported from the first end (102) of the furnace chamber (101) to the second end (103) of the furnace chamber (101) through the furnace chamber (101); 1.2 a transport device (200) for transporting saggar (105), comprising the following features: 1.2.1 the transport device (200) extends from a first end (201) of the transport device (200) to a second end (202) of the transport device (200); where 1.2.2 the first end (201) of the transport device (200) is adjacent to the second end (103) of the furnace chamber (101) and the second end (202) of the transport device (200) is adjacent to the first end (102) of the furnace chamber (101); 1.2.3 second transport means (203) by means of which saggar (105) can be transported from the first end (201) of the transport device (200) to the second end (202) of the transport device (200); wherein the second transport means (203) 1.2.3.1 comprise a transport track (205) on which the saggar (105) can be transported from the first end (201) of the transport device (200) to the second end (202) of the transport device (200); and wherein 1.2.3.2 the transport track (205) comprises several tracks (206, 207, 208), wherein on each of the tracks (206, 207, 208) Saggar (105) can be transported from the first end (201) of the transport device (200) to the second end (202) of the transport device (200).

2. Oven system (1) according to claim 1, wherein the tracks (206, 207, 208) run side by side.

3. Oven system (1) according to at least one of the preceding claims, wherein the tracks (206, 207, 208) run directly adjacent to each other.

4. Oven system (1) according to at least one of the preceding claims, wherein the tracks (206, 207, 208) run parallel to each other.

5. Oven system (1) according to at least one of the preceding claims, wherein the Saggar (105) are transportable by the second transport means (203) along a straight transport direction (T2).

6. Oven system (1) according to at least one of the preceding claims, wherein the Saggar (105) on each of the tracks (206, 207, 208) can be transported independently of the transport of the Saggar (105) on the other tracks (206, 207, 208).

7. Oven system (1) according to at least one of the preceding claims, wherein the tracks (206, 207, 208) are dimensioned in the same way.

8. Oven system (1) according to at least one of the preceding claims, wherein the tracks (206, 207, 208) are separated from each other by separating elements (213).

9. Oven system (1) according to at least one of the preceding claims, wherein the second transport means (203) are arranged as a roller conveyor.

10. Oven system (1) according to claim 9, wherein the second transport means (203) are arranged as a single roller conveyor.

11. Oven system (1) according to at least one of claims 9 to 10, wherein the single roller conveyor comprises the tracks (206, 207, 208).

12. Oven system (1) according to at least one of claims 9 to 11, wherein the roller conveyor comprises rollers (204) for transporting the saggar (105) and wherein the rollers (204) extend over all of the tracks (206, 207, 208).

13. Oven system (1) according to at least one of the preceding claims, wherein the transport track (205) is arranged in a single housing.

14. Method for operating a furnace system (1) for the heat treatment of products, comprising the following steps: 14.1 providing a furnace system (1) according to at least one of the preceding claims; 14.2 providing sag yarn (105); 14.3 transporting the sag yarn (105) by means of the first transport means (104) from the first end (102) of the furnace chamber (101) to the second end (103) of the furnace chamber (101) through the furnace chamber (101); 14.4 transporting the sag yarn (105) by means of the second transport means (203) from the first end (201) of the transport device (200) to the second end (202) of the transport device (200).

15. Method according to claim 14, wherein when transporting the saggar (105) by means of the second transport means (203) the saggar (105) are transported simultaneously on different tracks (206, 207, 208) of the transport track (205).

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