Method and device for introducing sewage sludge onto a drying surface of a sludge drying system

Abstract

The invention relates to a method for introducing sewage sludge (5) onto a drying surface (2) of a sludge drying system (1), wherein sludge (5) to be dried is conveyed along the drying surface (2) by means of a linear conveyor (11) and is discharged at specified points on the drying surface (2). The linear conveyor (11) interacts with a removal device (13) which can be moved along the linear conveyor (11). A corresponding device for introducing sewage sludge (5) onto a drying surface (2) of a sludge drying system comprises a linear conveyor (11) for conveying the sludge (5) to be dried along the drying surface (2) and for discharging the sludge (5) at specified points on the drying surface (2). The linear conveyor (11) is paired with a removal device (13) which can be moved along the linear conveyor (11).

Description

[0001] Method and device for introducing sewage sludge onto a drying surface of a sludge drying plant

[0002] The present invention relates to a method for introducing sewage sludge onto a drying surface of a sludge drying plant, wherein sludge to be dried is conveyed along the drying surface by means of a linear conveyor and is dropped onto the drying surface at predetermined locations, as well as to a device for introducing sewage sludge onto a drying surface of a sludge drying plant, which device comprises a linear conveyor for conveying the sludge to be dried along the drying surface and for dropping the sludge onto the drying surface at predetermined locations.

[0003] For large solar sewage sludge dryers, automatic sludge feeding is useful to reduce labor and the potential hazards caused by traffic. A typical machine in a solar sewage sludge drying plant is a so-called sludge turner. This is, for example, a movable bridge structure that spreads, turns, and transports the sludge on a drying surface. The sludge dries through solar radiation and convection heat. In large plants, several such bridge structures are required to achieve the necessary evaporation area. With automatic sludge feeding, fresh sewage sludge or the material to be dried is added to the drying surface of the solar sewage sludge dryer in several piles from a central point. Starting from these piles, the sewage sludge is distributed as evenly as possible across the drying surface with the help of the sludge turner.The piles are currently formed using linear conveyors, such as screw conveyors with closable openings, conveyor belts with scrapers, or pumps. As disclosed in EP 1 464 628 A1, the sewage sludge is conveyed upwards along the edge of the drying area, over the sludge turner, and deposited at predetermined locations. This has the disadvantage that transporting the sewage sludge upwards requires a lot of energy, and the discharge from a great height causes the sewage sludge to splash, contaminate the plant, and can only be deposited inaccurately.

[0004] The object of the present invention is therefore to provide a method and a device with which sewage sludge can be applied to the drying surface of a solar sewage sludge dryer in a targeted manner and with low energy and maintenance expenditure at predetermined locations.

[0005] The problem is solved by a method and / or a device having the features of the independent claims. Advantageous or preferred embodiments are each the subject of a corresponding dependent claim.

[0006] A method is proposed for introducing sewage sludge onto a drying area of ​​a sludge drying plant, wherein the sludge to be dried is conveyed by means of a linear conveyor, preferably above and along the drying area, and deposited at predetermined locations. Typically, the sludge is transported across the width of the drying area and deposited in heaps. During the drying process, the sewage sludge is distributed over the drying area and gradually transported along the length of the drying area. It is repeatedly turned so that it can dry thoroughly. Once the sewage sludge has dried sufficiently, it is removed from the drying area at the end of the drying area opposite where it was introduced and discharged from the sludge drying plant. The drying of the sludge is preferably carried out using solar energy.This means that, in an advantageous design, the sludge drying system can be covered with a transparent plastic or glass cover, similar to a greenhouse. A heating system designed like an underfloor heating system can be installed in the drying area to remove moisture from the sewage sludge. Depending on the typical weather conditions at the installation site, however, the cover and heating system can also be omitted.

[0007] According to the invention, the linear conveyor cooperates with a discharge device that can be moved along the linear conveyor. The linear conveyor transports the sewage sludge preferably across the width of the drying area. The discharge device, which can be moved along the linear conveyor, removes the sewage sludge from the linear conveyor at the location where the discharge device is currently located and deposits it onto the drying area at a predetermined point. By moving the discharge device, the sewage sludge can be deposited individually and as needed at the predetermined locations. The discharge points can be changed as needed, for example, to enable a particularly even distribution of the sewage sludge.

[0008] It is particularly advantageous if the movable removal device transports the sewage sludge from the linear conveyor via a cross conveyor, transversely to the linear conveyor, and only then discharges it. This has the advantage that the linear conveyor can be positioned outside the drying area and thus arranged significantly lower than a state-of-the-art linear conveyor. This means that the linear conveyor does not need to be higher than the sludge turner to allow the sludge turner to pass through smoothly. The movable removal device, which transports the sewage sludge transversely to the linear conveyor after removal and only then discharges it, allows the drying area to be supplied with fresh sewage sludge from outside the drying area.Before the sludge turner resumes turning and distributing the sewage sludge at the beginning of the drying area, the discharge device can be positioned outside the path of the sludge turner, for example, to the side of the drying area. Introducing the sewage sludge from a low height significantly reduces plant contamination and energy consumption, as the sewage sludge must be transported to a height above the sludge turner before being conveyed across the width of the drying area.

[0009] However, even if the sewage sludge is conveyed in the discharge device to a height above the sludge turner, it is advantageous to first discharge the sewage sludge onto the cross conveyor. The cross conveyor is located at a height between the highest conveying height of the discharge device and the drying area. By first discharging the sludge onto the cross conveyor and then from there onto the drying area, the respective discharge height is low, so little contamination from splashing sewage sludge is to be expected.

[0010] It is advantageous if the sludge to be dried is deposited onto the drying surface and / or a transport vehicle, in particular a sludge turner. Preferably, the sludge is deposited directly onto the drying surface. However, it is also possible for the sewage sludge to be deposited additionally or alternatively onto a transport vehicle, preferably a sludge turner, with which the sludge can then be advantageously, particularly evenly, distributed over the drying surface. Because the sludge can thus be spread in a uniformly thin layer on the drying surface from the outset, faster drying is possible.

[0011] It is also advantageous if the removal device is moved continuously and / or in sections, primarily discharging the sludge onto the drying surface. If the removal device is moved continuously and simultaneously discharges the sludge onto the drying surface, the sludge is deposited in a linear pattern, which can be picked up by the sludge turner and distributed evenly over the drying surface. If, on the other hand, the removal device is moved in sections, for example, only discharging the sludge when the removal device on the linear conveyor is stationary, the sludge is deposited in dots on the drying surface. The sludge turner then picks the sludge from the dot-shaped pile and gradually distributes it evenly over the drying surface.Depending on the prevailing conditions, such as the consistency or moisture content of the sludge or the available drying energy, linear or point-like deposition may be more advantageous. Linear or point-like deposition can also be achieved by operating the transverse conveyance of the sludge from the discharge device continuously or discontinuously, thereby achieving linear or point-like deposition of the sludge on the drying surface, particularly in conjunction with the linear conveyor.

[0012] It is also advantageous if the linear conveyor is only fed with sludge in sections, so that gaps arise between the sludge on the linear conveyor. If the sludge is fed discontinuously on the linear conveyor to the removal device, the sludge removal is also discontinuous if the removal device moves continuously. The sludge is therefore deposited on the drying area with gaps between the individual deposits. This allows the sludge to be distributed particularly quickly and evenly on the drying area by the sludge turner. It is also possible, in systems with several adjacent drying areas, to use gaps in the sludge on the linear conveyor to specifically feed individual drying areas with sewage sludge while leaving other drying areas unattended.

[0013] It is also advantageous if the sludge to be dried is dropped onto the drying surface close to the ground, particularly from a height of less than 3 meters above the drying surface. Dropping the sludge close to the ground reduces contamination of the system and allows for more targeted deposition. It is advantageous if the sludge to be dried is dropped at a lateral distance of at least 2 meters from the linear conveyor. This ensures that there is sufficient distance between the linear conveyor and the travel path of the sludge turner so that the sludge turner and the linear conveyor cannot collide with each other. This is particularly true if the removal device with its cross conveyor is arranged outside the travel path of the sludge turner, if the latter is located in the area of ​​the front edge of the drying surface, or if the cross conveyor of the removal device extending into the travel path of the sludge turner is slightly higher than the sludge turner.This ensures that there is no collision with either the linear conveyor or the removal device.

[0014] It is advantageous if the speed of the linear conveyor is variable, with the linear conveyor conveying faster, especially when the discharge device is moving forward than when it is moving backward. The variable speed of the linear conveyor makes it possible for the relative speed between the linear conveyor and the discharge device to remain essentially the same, regardless of whether the discharge device is currently moving in the direction of transport of the linear conveyor or against it. This allows the sewage sludge to be removed from the linear conveyor reliably and evenly.

[0015] A device according to the invention for introducing sewage sludge onto a drying surface of a sludge drying plant comprises a linear conveyor for conveying the sludge to be dried along the drying surface and for discharging the sludge at predetermined locations on the drying surface. The linear conveyor is preferably arranged in the region of an end face of the drying surface. At the beginning of the drying process, the sewage sludge is discharged onto the drying surface in the region of the linear conveyor. During the drying process, it is conveyed across the drying surface, preferably with a sludge turner, and removed from the drying surface as dried sewage sludge at the opposite end of the drying surface. According to the invention, a removal device movable along the linear conveyor is assigned to the linear conveyor.With the movable removal device, the sewage sludge can be removed from the linear conveyor at a predetermined location, where the removal device is currently located, and deposited. This also allows for various deposit configurations, which result from the movement pattern of the removal device and / or the linear conveyor. The removal device can be moved using a drive device, for example, a motor-driven gear that engages a rack arranged along the linear conveyor.

[0016] It is also advantageous if the removal device includes a cross conveyor arranged transversely to the linear conveyor. This makes it possible, in contrast to existing systems, for the linear conveyor to be installed outside the actual drying area and very low there. Because the removal device is movable, it can be moved out of the path of the sludge turner to avoid a collision with the sludge turner, for example. As soon as the sludge turner has left the area of ​​the removal device, the movable removal device can be moved back into the area of ​​the drying area to deposit more sewage sludge there. Alternatively, the cross conveyor can be arranged at a height that is above the overall height of the sludge turner. This also prevents a collision between the sludge turner and the removal device or the cross conveyor.

[0017] It is also advantageous if the linear conveyor and / or cross conveyor is a belt conveyor, a scraper conveyor, or a screw conveyor. However, the use of a belt conveyor is particularly advantageous because it is simple to set up and maintain, especially when it comes to cleaning. In a particularly advantageous embodiment, the sewage sludge is conveyed along the width of the drying area using a linear conveyor designed as a belt conveyor. The movable removal device, which is movable relative to the linear conveyor, has a cross conveyor, also designed as a belt conveyor, onto which the sewage sludge falls from the linear conveyor. By means of the cross conveyor, the sewage sludge is moved laterally away from the linear conveyor and towards the drying area. There it is then discharged, preferably onto the drying area.

[0018] It is also advantageous if the removal device includes a removal carriage, particularly a tripper car, for transferring the sludge from the linear conveyor to the cross conveyor. The removal carriage or tripper car makes it very easy to transfer the sewage sludge from the linear conveyor to the cross conveyor. The conveyor belt is guided in a looped manner, so that the material transported on the conveyor belt falls off the conveyor belt at an upper deflection point and lands on the cross conveyor located below.

[0019] It is advantageous if the cross conveyor is arranged below the removal carriage, preferably below a discharge edge of the removal carriage, in particular between the tripper car and the linear conveyor. The removal carriage guides the sewage sludge via an incline of the conveyor belt into a plane which is slightly, for example, 1 to 2 meters, above the cross conveyor. The conveyor belt is abruptly guided downwards in an S-shape over an upper deflection and then back a short distance, so that the sewage sludge transported on it is dropped from the conveyor belt in the removal carriage and lands on the cross conveyor arranged below the upper deflection. The cross conveyor is then able to transport the sewage sludge transversely to the linear conveyor, laterally away from it and towards the drying area. The transfer from the linear conveyor to the cross conveyor can therefore be carried out very easily and reliably.It is also advantageous if the discharge device has a travel speed of more than 0.2 m / s. This allows the discharge device to be moved very quickly from one deposit location to another or out of the travel range of the sludge turner.

[0020] It is also advantageous if the speed of the linear conveyor is variably adjustable, especially when moving forward, i.e., in the transport direction of the linear conveyor, the removal device conveys faster than when moving backward, i.e., opposite to the transport direction of the linear conveyor, the removal device. The adjustable speed of the linear conveyor allows the relative speed of the linear conveyor and the removal device to remain essentially constant, regardless of the direction of travel of the removal device. This ensures consistent removal of the sludge from the linear conveyor.

[0021] It is also advantageous if the linear conveyor and / or the take-off carriage, in particular the tripper car, and / or the cross conveyor have a scraper for removing residual sludge. Sludge residues on the equipment can be mechanically removed by the scraper, which scrapes the conveyor belts.

[0022] It is also advantageous if the linear conveyor and / or the discharge carriage, especially the tripper car, and / or the cross conveyor are made of corrosion-resistant material and / or are provided with corrosion protection. The sludge drying plant is subject to humid and humid ambient conditions. To prevent damage to the plant components due to corrosion, appropriate protection must be provided.

[0023] It is advantageous if the linear conveyor and / or the cross conveyor are aligned substantially horizontally, and / or the discharge carriage, in particular the tripper car, has a gradient of less than 20°. This ensures safe transport of the sewage sludge without any parts of it falling off the linear conveyor and / or the cross conveyor.

[0024] Furthermore, it is advantageous if the conveying capacity of the linear conveyor is more than 20 m 3 / h, preferably more than 30 m 3 / h. For correspondingly large sludge drying plants, the use of the device according to the invention is particularly advantageous.

[0025] A particularly preferred embodiment of the invention has the advantage that, when using a discharge carriage, the partially sticky sewage sludge is provided with a true drop edge, allowing the sludge to be removed more completely from the conveyor belt. Another advantage of the application is that a conveyor belt and a discharge carriage can cover a large number of adjacent drying areas with sludge turners. This allows for a very economical automation of the feeding of the drying areas with sewage sludge.

[0026] The conveyor belt with push-off carriage can also be installed close to the ground, as a cross conveyor below the discharge edge can place the sludge far enough into the drying area for the associated sludge turning machine, designed as a bridge structure, to collect it. When the bridge structure collects the sludge, the cross conveyor is preferably already at the next drying area.

[0027] Complex support structures and the need to lift the sludge to high heights are eliminated. The drop height of the sludge is much lower, and contamination from splashing sludge is reduced. The process can be carried out inside a dryer shell or outside without a dryer shell. The method and device are designed as described above, whereby the aforementioned features can be present individually or in any combination.

[0028] Further advantages of the invention are described in the following exemplary embodiments. It shows:

[0029] Figure 1 is a plan view of a sludge drying plant,

[0030] Figure 2 shows a side view of a linear conveyor and

[0031] Figure 3 is a side view of a cross conveyor.

[0032] In the following description of the illustrated embodiments, the same reference numerals are used for features that are identical and / or at least comparable in their design and / or mode of operation, even if they are shown in different embodiments. Unless explained again in detail, their design and / or mode of operation corresponds to the design and mode of operation of the features already described above.

[0033] Figure 1 shows a plan view of a sludge drying plant 1. The sludge drying plant 1 has several drying surfaces 2 arranged next to one another. The drying surfaces 2 can have a heating device (not shown) in order to dry the moist sludge lying on the drying surfaces 2 as quickly and efficiently as possible. A gap 3 is provided between each two adjacent drying surfaces 2. The drying surfaces 2 are essentially rectangular with a width B and a length L. On each drying surface 2 there is a sludge turner 4 that can be moved back and forth in the direction of movement S. The sludge turner 4 has rotating blades 20, shown in Figure 3, which distribute and turn sludge 5 on the drying surface 2 as evenly as possible.The sludge 5 is introduced onto the drying surface 2 as a point-shaped heap 6 or a linear heap 7 on a feed side 8 of the drying surface 2 and is then gradually turned by the sludge turner 4 for better drying and conveyed to the removal side 9 at the other end of the drying surface 2. There, it is removed from the drying surface 2 by devices not shown and transported away for further use.

[0034] To feed the sludge 5 to the drying surfaces 2, the sludge 5 is first applied from a central feed device 10 to a linear conveyor 11. The linear conveyor 11 interacts with a cross conveyor 12. The linear conveyor 11 and the cross conveyor 12 are connected to a movable removal device 13. The removal device 13 comprises a tripper car 14. The cross conveyor 12 is arranged on the removal device 13 and, together with the tripper car 14, can be moved back and forth along the linear conveyor 11 in the direction of movement A. For this purpose, the removal device 13 is provided with wheels 15, which are driven by a motor (not shown) and move the removal device 13 along the respective feed side 8 of the drying surfaces 2.Alternatively, for example, a drive with a driven gear on the removal device 13 is also possible, which engages with a rack arranged along the linear conveyor 11 and thereby displaces the removal device 13 in the direction of movement A. The speed when the removal device 13 travels in the transport direction of the linear conveyor 11 is preferably slower than against the transport direction of the linear conveyor 11 in order to obtain the same relative speeds of the linear conveyor 11 and the removal device 13.

[0035] In this embodiment, the linear conveyor 11 has a conveyor belt 16, which is moved in one direction in the direction of movement F. The conveyor belt 16 runs through the tripper car 14, in which it is moved upwards from a horizontal level via a ramp, abruptly deflected, and then guided back to the original level of the linear conveyor 11. Due to the abrupt deflection of the conveyor belt 16, the sludge 5 detaches from the conveyor belt 16 and falls onto the cross conveyor 12 arranged below. The cross conveyor 12 in this embodiment is also a belt conveyor with a direction of movement Q. The cross conveyor 12 thereby transports the sludge 5 that has landed on it sideways away from the linear conveyor 11 toward the drying area 2. At the end of the cross conveyor 12, the sludge 5 falls onto the drying area 2.Alternatively, the linear conveyor 11 and / or the cross conveyor 12 can also be designed in the form of a scraper conveyor or as a screw conveyor.

[0036] If the removal device 13 remains in one place for a longer period of time, the sludge 5 falls onto the same spot on the drying surface 2 and thereby forms point-shaped heaps 6 on the drying surface 2. If the removal device 13 is conveyed a little further and remains there again for a predetermined period of time, a neighboring point-shaped heap 6 is formed on the same or the neighboring drying surface 2. If, alternatively, the removal device 13 moves slowly in the direction of movement A while the cross conveyor 12 conveys the sludge 5 onto the drying surface 2, the sludge 5 is deposited on the drying surface 2 in the form of the linear heap 7. If individual drying surfaces 2 are not to be fed, i.e. are to be left out and no sludge 5 is to be deposited on them, it is advantageous if the linear conveyor is fed with sludge gaps from the feed device 10.This means that no or hardly any sludge is placed on the cross conveyor in the corresponding areas and, despite the continuous movement of the removal device, no sludge 5 is discharged.

[0037] In order to avoid a collision between the cross conveyor 12 and the sludge turner 4, the removal device 13 is preferably moved such that it is located outside the travel path of the sludge turner 4 when the sludge turner 4 is located on the feed side 8 of the drying area 2. This can be achieved, for example, by the removal device 13 conveying sludge 5 to an adjacent drying area 2 at this time or by the cross conveyor 12 being located in the intermediate space 3 between two drying areas 2. Alternatively, it is also possible that, during the feed of sludge 5 by the cross conveyor 2 to the drying area 2, the movement of the sludge turner 4 is restricted by an appropriate control system such that it cannot travel into the area of ​​the cross conveyor 12.Finally, it is also possible for the heights of the cross conveyor 12 and the sludge turner 4 to be coordinated such that the cross conveyor 12 is positioned so far above the sludge turner 4 that there is no risk of collision. In this case, it is also possible for the cross conveyor 12 to convey sludge not onto the drying surface 2, but directly onto the sludge turner 4, in particular its blade 20, whereby the sludge turner 4 is able to distribute the collected sludge 5 in a targeted manner over the entire drying surface 2.

[0038] Figure 2 shows a side view of the linear conveyor 11. The linear conveyor 11, together with the drying surfaces 2 arranged behind it, is arranged under a glass housing 17. This allows solar energy to be used to dry the moist sludge 5 cost-effectively. Of course, the system according to the invention can also be used without an enclosure.

[0039] The sludge 5 is applied to the conveyor belt 16 of the linear conveyor 11 via the feed device 10. The conveyor belt 16 transports the sludge 5 in the direction of movement F towards the removal device 13. The removal device 13 engages with its tripper car 14 in the conveyor belt 16 and forms a ramp on which the sludge 5 is conveyed to a level above the linear conveyor 11. The tripper car 14 forms the ramp for the conveyor belt 16 with an incline angle α of preferably less than 20°, so that the sludge 5 can be reliably conveyed upwards. The conveyor belt 16 is abruptly deflected via an upper deflection 18, whereby the sludge 5 is released from the conveyor belt 16 and falls downwards onto the cross conveyor 12. The sludge 5 is then conveyed by the cross conveyor 12 towards the drying area 2 and discharged there.Via further deflections 19, the conveyor belt 16 is guided back to the original level of the linear conveyor 11. The removal device 13, together with the tripper car 14 and the cross conveyor 12, is moved along the linear conveyor by means of the driven wheels 15.

[0040] 11 moves back and forth in the direction of movement A. This allows the sludge 5 to be delivered in a targeted manner at various points along the linear conveyor 11 at predetermined locations on the drying surface 2.

[0041] Figure 3 shows a side view of the cross conveyor 12. The cross conveyor

[0042] 12 is operatively connected to the linear conveyor 11. Sludge 5, which is transported upwards in the direction F by means of the linear conveyor 11 and the removal device 13 with its tripper car 14, falls onto the cross conveyor 12 and is moved in the direction Q towards the end of the cross conveyor 12. At the end of the cross conveyor 12, the sludge 5 detaches from the cross conveyor 12 and falls downwards. In the present exemplary embodiment, the sludge turner 4 is located below the end of the cross conveyor 12 and can thus collect the falling sludge 5 and transport and turn it along the drying surface 2. The turning of the sludge 5 takes place with rotatable blades 20 of the sludge turner 4, which distribute the sludge 5 evenly on the drying surface 2 as the sludge turner 4 moves in the direction of movement S and transport it towards the removal side 9 (Figure 1).Instead of the sludge turner 4, it is of course also possible to provide other types of transport and distribution devices to evenly distribute the sludge 5 on the drying surface 2 and transport it to the end of the drying surface 2 so that it can be removed from the drying surface 2 as dried sludge. In order to remove sludge residues that have not been detached from the cross conveyors 12, a scraper 21 is assigned to the cross conveyor 12. The scraper 21 scrapes the sludge residues from the conveyor belt of the cross conveyor 12 so that they ultimately fall onto the drying surface 2 or the sludge turner 4. Such scrapers 21 can also be arranged in a comparable manner in the area of ​​the upper deflection 18 of the tripper car 14 or at the end of the linear conveyor 11.

[0043] To prevent a collision between the cross conveyor 12 and the sludge turner 4, the cross conveyor 12 is arranged at a clear height HQ above the drying surface 2 that is higher than the height of the sludge turner 4. In an advantageous embodiment, the height HQ is at least 2 meters, but preferably less than 3 meters. It is particularly advantageous if this height HQ is not significantly higher than the sludge turner 4 in order to keep the fall height of the sludge 5 as low as possible. This ensures that the sludge 5 splashes as little as possible when it hits the drying surface 2 or the sludge turner 4 and contaminates the surrounding area.

[0044] It is also advantageous if the discharge height HL of the sludge 5 from the linear conveyor 11 or the tripper car 14 onto the cross conveyor 12 is as low as possible. Discharge heights HL between 2 and 4 meters have proven advantageous in order to avoid unnecessary contamination and, moreover, to keep the energy consumption for the vertical transport of the sludge 5 as low as possible.

[0045] So that the sludge 5 can be grasped by the sludge turner 4 on the drying surface 2 and, on the other hand, the sludge turner 4 does not collide with the linear conveyor 11, the cross conveyor 12 has a length LQ at the side of the linear conveyor 11, which extends sufficiently far into the drying surface 2. A length LQ of at least 2 meters, preferably more than 2.5 meters, has proven advantageous. To ensure that the travel path of the removal device 13 remains as free as possible from contamination, it is advantageous if the wheels 15 of the removal device 13 run on a platform 21 that is slightly higher than the drying surface 2 on which the sludge 5 is spread.

[0046] List of reference symbols

[0047] 1 sludge drying plant

[0048] 2 drying area

[0049] 3 space

[0050] 4 mud turners

[0051] 5 mud

[0052] 6 point-like clusters

[0053] 7 linear clusters

[0054] 8 Feed side

[0055] 9 Removal side

[0056] 10 Feeding device

[0057] 11 linear conveyors

[0058] 12 cross conveyors

[0059] 13 Acceptance device

[0060] 14 tripper cars

[0061] 15 wheels

[0062] 16 Conveyor belt

[0063] 17 housings

[0064] 18 upper deflection

[0065] 19 Deflection

[0066] 20 shovels

[0067] 21 scrapers

[0068] 22 Platform a Incline angle

[0069] A Direction of movement of the removal device

[0070] F Conveyor belt movement direction

[0071] Q Direction of movement of cross conveyor

[0072] S Direction of movement of mud turner

[0073] HQ height cross conveyor

[0074] HL discharge height linear conveyor

[0075] LQ Length of cross conveyor

Claims

Patent claims 1. Method for introducing sewage sludge (5) onto a drying surface (2) of a sludge drying plant (1), wherein sludge (5) to be dried is conveyed along the drying surface (2) by means of a linear conveyor (11) and is discharged at predetermined points on the drying surface (2), characterized in that the linear conveyor (11) cooperates with a removal device (13) which can be moved along the linear conveyor (11).

2. Method according to the preceding claim, characterized in that the movable removal device (13) conveys the sewage sludge (5) after removal from the linear conveyor (11) across to the linear conveyor (11) and only then discharges it.

3. Method according to one or more of the preceding claims, characterized in that the sludge to be dried (5) is thrown onto the drying surface (2) and / or a transport vehicle, in particular a sludge turner (4).

4. Method according to one or more of the preceding claims, characterized in that the removal device (13) is moved continuously or in sections and / or discharges sludge (5).

5. Method according to one or more of the preceding claims, characterized in that the sludge (5) to be dried is discharged in a point-like or linear manner.

6. Method according to one or more of the preceding claims, characterized in that the linear conveyor (11) only is fed with sludge (5) in sections so that gaps are created between the sludge (5) on the linear conveyor (11).

7. Method according to one or more of the preceding claims, characterized in that the sludge (5) to be dried is dropped onto the drying surface (2) close to the ground, in particular from a height (HQ) of less than 3 meters above the drying surface (2).

8. Method according to one or more of the preceding claims, characterized in that the sludge (5) to be dried is discharged at a lateral distance from the linear conveyor (11) of at least 2 meters.

9. Method according to one or more of the preceding claims, characterized in that the speed of the linear conveyor (11) is variable, wherein the linear conveyor (11) conveys faster in particular when the removal device (13) travels forwards than when the removal device (13) travels backwards.

10. Device for introducing sewage sludge (5) onto a drying surface (2) of a sludge drying plant, which comprises a linear conveyor (11), for conveying the sludge (5) to be dried along the drying surface (2) and for discarding the sludge (5) at predetermined points on the drying surface (2), characterized in that the linear conveyor (11) is assigned a removal device (13) which can be moved along the linear conveyor (11).

11. Device according to the preceding claim, characterized in that the removal device (13) comprises a transverse conveyor (12) arranged across the linear conveyor (11).

12. Device according to one or more of the preceding claims, characterized in that the linear conveyor (11) and / or transverse conveyor (12) is a belt conveyor, a scraper conveyor or a screw conveyor.

13. Device according to one or more of the preceding claims, characterized in that the removal device (13) comprises a removal carriage, in particular a tripper carriage (14), for transferring the sludge (5) from the linear conveyor (11) to the transverse conveyor (12).

14. Device according to one or more of the preceding claims, characterized in that the cross conveyor (12) is arranged below the removal carriage, preferably below an upper deflection (18) of the removal carriage, in particular between the linear conveyor (11) and the tripper carriage (14).

15. Device according to one or more of the preceding claims, characterized in that the removal device (13) has a travel speed of more than 0.2 m / s.

16. Device according to one or more of the preceding claims, characterized in that the speed of the linear conveyor (11) is variably adjustable, in particular when the removal device (13) moves forward it conveys faster than when the removal device (13) moves backward.

17. Device according to one or more of the preceding claims, characterized in that the linear conveyor (11) and / or the removal carriage, in particular the tripper carriage (14), and / or the cross conveyor (12) has a scraper (21) for removing residual sludge (5).

18. Device according to one or more of the preceding claims, characterized in that the linear conveyor (11) and / or the removal carriage, in particular the tripper carriage (14), and / or the cross conveyor (12) are made of corrosion-resistant material and / or are provided with corrosion protection.

19. Device according to one or more of the preceding claims, characterized in that the linear conveyor (11) and / or the transverse conveyor (12) are aligned substantially horizontally, and / or the take-off carriage, in particular the tripper carriage, has a gradient a of less than 20°.

20. Device according to one or more of the preceding claims, characterized in that a conveying capacity of the linear conveyor (11) is more than 20 m 3 / h, preferably more than 30 m 3 / h.

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