DE202021102132U1 - Device for drying material, in particular biomass, for example sewage sludge - Google Patents

Abstract

Device (1) for drying material, in particular biomass, for example sewage sludge,
with one or more pairs of drying surfaces (2), each pair of drying surfaces (2) having an upper drying surface (2a) and a lower drying surface (2b) over which the material can be conveyed for drying,
Each pair of drying surfaces (2) is assigned a conveyor device (3) with conveyor elements (4) running around the upper drying surface (2a) for conveying the material over the upper drying surface (2a) and the lower drying surface (2b),
wherein the upper drying surface (2a) and the lower drying surface (2b) as well as the conveying device (3) and its conveying elements (4) are designed and arranged to one another in such a way that the conveying elements (4) for conveying the material over the upper drying surface (2a) and moved in opposite directions to convey the material over the lower drying surface (2b),
wherein the upper drying surface (2a) is arranged relative to the lower drying surface (2b) in such a way that the material after being conveyed over the upper drying surface (2a) for subsequent conveyance over the lower drying surface (2b) from the upper drying surface (2a) to the lower drying surface (2b) falls,
characterized,
that the device (1) has one or more moisture sensors (9) for determining the moisture content of the material and / or one or more moisture sensors for determining the humidity in the device (1) and / or outside the device (1) and / or one or has a plurality of temperature sensors for determining the air temperature in the device (1) and / or outside the device (1), and
that the device has a control and / or regulating device (20) which is used for signal transmission with the moisture sensors (9) for the material and / or for the air and / or the temperature sensors and / or control and / or controllable components of the device (1), for example air supply heating devices (14) and / or air supply fans (15) for supplying air into the device (1) and / or air removal fans (16) for removing air from the device (1) and / or drying surface heating devices (8) and / or drive devices (7) of the conveying devices (3) and / or closing flaps (21) of the air supplies (12) and / or a supply device, in particular a height conveyor (22), for the material to be dried is connected.

Description

The invention relates to a device for drying material, in particular biomass, for example sewage sludge. The biomass can also be milk sludge, spent grains, fermentation residues, liquid manure, animal manure or biogas manure. The material can also be moistened or moisture-containing mass or sludge or moistened or moisture-containing parts or granulates, such as metal chips or wood chips.

Known devices bring, for example, sewage sludge to dry on a drying surface. These devices have conveying devices with which the sewage sludge is distributed over the drying area or conveyed over the drying area. It is also known to arrange several drying surfaces one above the other.

The invention is based on the object of specifying a new device for drying material. In particular, a device is to be proposed which enables the production of an end product of constant quality.

This object is achieved by a device with the features of claim 1. Advantageous configurations and developments are specified in the dependent claims.

The inventive device for drying material, in particular biomass, for example sewage sludge, has one or more pairs of drying surfaces, each pair of drying surfaces having an upper drying surface and a lower drying surface over which the material can be conveyed for drying. Each pair of drying surfaces is assigned a conveying device running around the upper drying surface with conveyor elements for conveying the material over the upper drying surface and the lower drying surface. The upper drying surface and the lower drying surface as well as the conveyor device and its conveyor elements are designed and arranged in relation to one another such that the conveyor elements are moved in opposite directions for conveying the material over the upper drying surface and for conveying the material over the lower drying surface. The upper drying surface is arranged relative to the lower drying surface in such a way that the material falls from the upper drying surface onto the lower drying surface after being conveyed over the upper drying surface for subsequent conveyance over the lower drying surface.

Furthermore, the device according to the invention has one or more moisture sensors for determining the moisture content of the material and / or one or more moisture sensors for determining the air humidity in the device and / or outside the device and / or one or more temperature sensors for determining the air temperature in the device and / or outside the device.

Furthermore, the device according to the invention has a control and / or regulating device which is used for signal transmission with the humidity sensors and / or the temperature sensors and / or controllable and / or regulatable components of the device, for example air supply heating devices and / or air supply fans for supplying of air into the device and / or air removal fans for removing air from the device and / or drying surface heating devices and / or drive devices of the conveying devices and / or closing flaps of the air supply and / or a supply device for the material to be dried.

The control and / or regulating device provided according to the invention can be used to produce high-quality dry granulate as a usable product from the material to be dried, in particular from biomass such as sewage sludge, whereby a crucial point is the constant quality of the product ensured by the control and / or regulating device Dry granulate is. The essential characteristics are the grain size, the degree of drying and the material throughput. By evaluating the measured values of the humidity and temperature sensors, the control and / or regulating device can react to changing conditions, for example external weather conditions or changing moisture content of the material in different drying stages when passing through the device, and for example the air flow, the temperature of the air and / or adjust the drying areas, the material addition and / or the conveying speed. For this purpose, appropriate software is stored in the control and / or regulating device.

The control and / or regulating device is expediently set up in such a way that incoming measured values from the humidity sensors and / or the temperature sensors can be or are processed by means of the signal transmission and, based on this processing, control signals by means of the signal transmission to the controllable and / or regulatable components of the device , for example to the air supply heating devices or to the air supply fan (s) and / or the air discharge fan (s) and / or the drying surface heating device (s) and / or the or the drive devices of the conveying devices and / or the closing flaps of the air supply devices and / or the supply device, in particular the height conveyor device, for the material to be dried can be or will be transferred.

For example, the control and / or regulating device checks the performance of the drying process for the material at various points on the device using the measured values of the moisture sensors provided there. If the result deviates from a desired target value and the drying performance is too low, i.e. the material is too moist, the temperature of the drying surface heating device can be increased in a first step, i.e. the energy input via the drying surface heating devices is increased elevated. If that is not enough, then the air supply heating devices in the air supply lines can be switched on or their temperature can be increased in order to heat the supply air and thereby introduce more energy into the device. It is also possible to switch on the air supply fans or to increase their output, which further increases the energy input into the device. If all of these measures are not sufficient and the material is still too moist, the control and / or regulating device can reduce the drive devices of the conveying devices and at the same time reduce the amount of material supplied. Although this reduces the amount of material processed per unit of time, the dwell time of the material in the device increases, which leads to greater drying.

If, on the other hand, the control and / or regulating device determines that the moisture in the material is too low, the aforementioned steps and measures can be withdrawn, typically in the reverse order, and the energy input into the device is reduced. If that is not enough because the outside conditions (high temperature and low humidity) are too good, additional closing flaps on the air inlets can throttle the supply air flow. For this purpose, each air supply can be equipped with a lockable shutter.

The control and / or regulating device can also be set up to predetermine a desired moisture content of the dried material. As a result, end products with different properties can be produced, i.e. different requirements of the customers of the products can be responded to. For example, the end product is in demand as fuel, with different furnaces making different demands on the moisture content of the fuel used and thus the end product of the device. Depending on this specification, the control and / or regulating device then controls and / or regulates the device, so that the specification is reliably adhered to and the end product, the dried material, has the desired quality.

One embodiment of the invention provides for the device to have one or more shredding devices, in particular choppers, for shredding the material during drying, in particular at the transition between two drying surfaces, for example from the upper drying surface to the lower drying surface, and / or at the end of drying, in particular before leaving the device, preferably for producing a defined grain size. The shredding device is driven by one of the conveying devices. Here, too, an adjustability of the comminution devices can be provided so that end products of different grain sizes can be produced, in accordance with the respective requirements.

According to a further development, the device according to the invention has a housing which encloses the pairs of drying surfaces with their associated conveying devices. The housing has one or more air inlets and one or more air outlets which are arranged in such a way that the air for drying the material is guided through the device. The air supply or the air supplies in turn have an air supply heating device, in particular an air supply heat exchanger, for heating the supplied air.

The air supply heating device enables, if required, an increased supply of energy in the form of additionally heated supplied air. This warmer air flows through the device and provides additional thermal energy for drying. This accelerates the drying process.

According to a further development, the air feed or the air feeds also have an air feed fan to support the air feed into the housing. The air supply fan can further accelerate the drying process by increasing the air flow through the device. Furthermore, the air supply fan supports the targeted air supply via the air supply heat exchanger, since this forced air supply ensures a reduction in the air otherwise flowing into the device through other openings, leaks and leaks in the housing. As a result, more air heated by the heat exchanger is conducted into the device and the energy input available for drying increases. This can increase the temperature in the device become. This is helpful, for example, when the outside temperature is comparatively low.

The air discharge of the device preferably has an air discharge fan to assist the air discharge from the housing. This air discharge fan ensures air currents in the device and for the discharge of the air enriched with moisture during drying, whereby the drying is accelerated.

A further development provides that the air discharge has a noise filter. The advantage of the noise filter is the noise reduction. An example of a strong source of noise is the exhaust fan. If a noise filter is provided on the air discharge, this acts as a silencer for the air discharge fan. In this way, for example, the noise level can be reduced by 15 dB.

Furthermore, it can be provided that the air discharge has an exhaust air filter system, in particular for filtering odors. Significant odors can develop in drying devices, especially at higher temperatures. To reduce this, air washers that are operated with chemicals can be provided. These are often not environmentally friendly, are expensive to purchase and maintain, among other things because of the disposal of chemicals such as acids.

As an alternative to these air washers, the exhaust air filter system expediently comprises one or more particle filters and / or an activated carbon filter. With one or more particle filters, in particular several particle filters for different particle sizes, odor-infected particles can be filtered out and odors can be significantly reduced. If this is not sufficient, an activated carbon filter is also useful, which absorbs at least a large part of the odors.

It is useful if the exhaust air filter system is a plug-in filter system with one or more, in particular one to five, for example three, replaceable filter plug-in units. The filter inserts can be equipped, for example, with particle filters, in particular for different particle sizes, and / or an activated carbon filter. This has the advantage of increased flexibility. As a result, the device can also be adapted with regard to its exhaust air at the respective installation site without effort and without high investment costs with regard to the specific filter requirements that arise, for example, in the context of a permit or acceptance, by replacing or retrofitting suitable filter inserts.

The upper drying surfaces and / or the lower drying surfaces can preferably be heated at least in sections, preferably completely, by means of a drying surface heating device. The drying surfaces can be heated in the manner of underfloor heating. For example, a hot water network can be provided in the device, the hot water pipes of which heat the drying surfaces. This hot water network can, for example, be flowed through by water that is heated to up to 80 ° C. The air supply heating devices can also be connected to this hot water network.

A further development of the invention provides that at least four or at least eight or at least sixteen pairs of drying surfaces are arranged one above the other in such a way that the material can be or is conveyed successively over all drying surfaces and in this case from the lower drying surface of the respective upper pair of drying surfaces to the The upper drying surface of the lower pair of drying surfaces falls until the lower drying surface of the lowermost pair of drying surfaces is reached.

It can also be provided that at least eight drying surface pairs are arranged one above the other and the device is therefore at least 6 meters high, or that at least sixteen drying surface pairs are arranged one above the other and the device is therefore at least 12 meters high.

By designing the device upwards in this way with a large number of drying areas arranged one above the other, an existing installation area can be used efficiently. This configuration also means that a comparatively small area is sufficient for setting up the device, which can nevertheless provide a high drying performance, since the available drying area is multiplied according to the number of drying areas arranged one above the other.

According to one embodiment, a thick matter pump is provided for feeding the material to be dried onto the upper drying surface of the uppermost pair of drying surfaces.

A discharge device for discharging the dried and possibly comminuted material from the device is expediently provided below the lower drying surface of the lowermost pair of drying surfaces.

• 1 ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zum Trocknen in einer schematischen Querschnittsdarstellung, und
• 2 ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zum Trocknen in einer schematischen Querschnittsdarstellung.

The invention is described below also with regard to further features and advantages with reference to the description of exemplary embodiments and below Explained in more detail with reference to the accompanying schematic drawings. Show it

• 1 an embodiment of a device according to the invention for drying in a schematic cross-sectional view, and
• 2 a further embodiment of a device according to the invention for drying in a schematic cross-sectional view.

Corresponding parts and components are provided with the same reference symbols in the figures.

1 shows an apparatus 1 for drying material, in particular biomass, for example sewage sludge. In the embodiment shown, the device 1 two pairs of drying surfaces arranged one above the other 2 on, also for example four or eight pairs of drying surfaces 2 could be arranged one above the other. Each pair of drying surfaces 2 again has an upper drying area 2a and a lower drying surface 2 B on. These drying areas 2a , 2 B is, as symbolically indicated by a dashed line, comparable to underfloor heating, a drying surface heating device 8th assigned, by means of which the respective drying area 2a , 2 B can be heated. For example, it can be a hot water network with hot water pipes.

To the material to be dried over the drying surfaces 2a , 2 B is to promote both pairs of drying surfaces 2 one around the upper drying area 2a rotating conveyor 3 with conveyor elements 4th for conveying the material over the upper drying surface 2a and the lower drying area 2 B assigned. The upper drying area 2a and the lower drying area 2 B as well as the conveyor 3 and their conveying elements 4th are designed and arranged to one another in such a way that the conveyor elements 4th for conveying the material over the upper drying surface 2a and for conveying the material over the lower drying surface 2 B be moved in opposite directions. The respective direction of movement of the conveyor elements 4th is in 1 shown by arrows.

Specifically, the funding facility includes 3 revolving traction means 5 , for example, a chain or rope that turns around two wheels 6th are guided, of which one of these wheels 6th a drive device 7th , for example a motor, in particular an electric motor, is assigned to the wheel 6th and thus the associated traction device 5 emotional. With the conveyor elements 4th For example, it can be transverse to the direction of movement and perpendicular to the plane of the drawing in 1 act extending crossbeams with conveyor hooks extending substantially perpendicular to the crossbeams. These conveyor hooks are arranged and / or aligned in such a way that they extend on both sides of the traction means, so that the material to be dried is transported through the conveyor device 3 with their conveying elements 4th both on the upper drying level 2a as well as on the lower drying level 2 B is promoted.

The upper drying area 2a is in each case so relative to the lower drying surface 2 B arranged that the material after conveying over the upper drying surface 2a for subsequent conveyance over the lower drying area 2 B from the upper drying area 2a on the lower drying surface 2 B falls. The two drying areas are concrete 2a , 2 B for this purpose arranged offset to one another in the horizontal direction. This also applies to the arrangement of the pairs of drying surfaces 2 to each other. This is done in such a way that the material from the lower drying area 2 B of the respective upper pair of drying surfaces 2 on the upper drying surface 2a of the lower pair of drying surfaces 2 falls. The direction of fall of the material between the drying surfaces 2a , 2 B is in 1 shown with dashed arrows. It can be seen here that between the upper drying area 2a and the lower drying area 2 B of each pair of drying surfaces 2 a shredding device 10 , for example a chopper, is arranged for shredding the material. This shredder 10 can by the drive device 7th the conveyor 3 be driven directly or indirectly. Another corresponding shredding device 10 is arranged below the lowest drying level of the device in such a way that material falling from the lowest drying level is crushed. The dried and comminuted material then emerges from the device 1 off or becomes out of the device 1 taken. The feeding of the material to be dried into the device 1 takes place from above in the example shown, the material falls onto the upper drying surface 2a of the top pair of drying surfaces 2 . This is shown by a dashed arrow. Alternatively, a side feed is also possible, in which case the material is also placed on the upper drying surface 2a of the top pair of drying surfaces 2 falls. As a rule, the material must be lifted to the required height in both cases. Suitable height conveying devices can be provided for this.

The device 1 has a housing 11 on the pairs of drying surfaces 2 with their associated conveyors 3 encloses. The case 11 has two air inlets 12th and an air vent 13th on. It's also just an air supply 12th or more than two air inlets 12th possible, as well as two or more air outlets 13th . The arrangement of the air supply 12th and air vents 13th should be done so that the air to dry the material through the device 1 to be led. The air should therefore expediently be guided over the item to be dried and / or provide for an exchange of air on the item to be dried. In the example shown in 1 the air enters the device from the left 1 and then through the inside of the case 11 , past the two pairs of drying surfaces 2 for air removal 13th guided. The air supply via the air supply 12th and the air discharge via the air discharge 13th are indicated by arrows in 1 shown.

In the air inlets 12th each is an air supply heater 14th , for example an air supply heat exchanger for heating the supplied air and an air supply fan 15th to support the air supply into the housing 11 built-in. The air supply fan 15th ensures that the air supplied via the air supply heater 14th is guided into the housing and thereby heated, so that a correspondingly increased energy input takes place. The air supply heat exchangers 14th can be connected to a common heating system with the drying surface heating devices 8th be connected, for example to a hot water network with hot water pipes. To get the supply air flow through the air inlets 12th To be able to reduce this if necessary, there is a lockable shutter on each air inlet 21 appropriate.

Also the air discharge 13th has an air evacuation fan 16 to support the evacuation of air from the housing 11 on. Next is the air discharge 13th an exhaust air filter system 17th , in particular for odor filtering, and / or a noise filter 18th on. The exhaust air filter system 17th is a slide-in filter system with five interchangeable filter racks 19th , with a different number, for example only one filter insert 19th or three filter inserts 18th can be provided. The filter inserts 19th can for example be equipped with different particle filters for different particle sizes or an activated carbon filter.

The device 1 has three moisture sensors in the example shown 9 to determine the moisture content of the material, two each on the lower drying surface 2 B , immediately after the material has fallen, and one in or on the shredding device 10 that is below the lower drying area 2 B of the lowest pair of drying surfaces 2 is arranged. Furthermore, one or more humidity sensors can be used to determine the air humidity in the device 1 and / or outside the device 1 and / or one or more temperature sensors for determining the air temperature in the device 1 and / or outside the device 1 be provided in 1 are not shown.

The device also has 1 a control and / or regulating device 20th on that in 1 symbolically on top of the case 11 is shown. As a rule, this is a control and / or regulating device 20th in a control cabinet of the device 1 arranged. The control and / or regulating device 20th is for signal transmission with the humidity sensors 9 for the material and the humidity sensors for the air and the temperature sensors and the air supply heating devices 14th and the air supply fans 15th for supplying air into the device 1 and the exhaust fan 16 for removing air from the device 1 and / or drying surface heating devices 8th and / or the drive devices 7th of the funding institutions 3 and / or the closing flaps of the air inlets 12th and the height conveyor or other feed devices for the material to be dried. The connection for signal transmission can be implemented by cable, but it can also be implemented wirelessly, for example by radio. The control and / or regulating device 20th is set up in such a way that incoming measured values from the humidity sensors and / or the temperature sensors can be or are processed by means of the signal transmission and, on the basis of this processing, for example using stored tables and / or algorithms, control signals by means of the signal transmission to the air supply heating devices 14th and to the air supply fans 15th and the exhaust fan 16 and the drying surface heaters 8th and the drive device or devices 7th of the funding institutions 3 and / or the closing flaps 21 the air supply 12th and the height conveyor device or other supply device for the material to be dried can be or will be transferred.

While 1 based on just two pairs of drying surfaces 2 the details of the device 1 clarifies, shows 2 the possibilities for building the device 1 upwards. The various details can be analogous to 1 be realized. The traction devices of the conveyors are in 2 Shown as dashed lines to distinguish it from the drying areas. Typically the device has at least four pairs of drying surfaces 2 , so eight drying areas 2a , 2 B on. A structure twice as high with eight pairs of drying surfaces 2 and thus sixteen drying areas 2a , 2 B knows how in 2 shown, typically a height H1 of 6 meters. In order to be able to provide twice the total drying area, there is also a construction twice as high with sixteen pairs of drying areas 2 and thirty-two drying areas 2a , 2 B possible, as in 2 shown. The height then increases by the height H2 of also 6 meters to the total height H of 12 meters. In all these configurations, the respective pairs of drying surfaces are arranged one above the other in such a way that the material is successively over all drying surfaces 2a , 2 B is or is being promoted and this from the lower drying area 2 B of the respective upper pair of drying surfaces 2 on the upper drying surface 2a of the lower pair of drying surfaces 2 falls until the lower drying surface 2 B of the lowest pair of drying surfaces 2 is reached. The path of the material through the device 1 , specifically the transition between the drying areas, is in 2 shown by arrows. The upper material feed and the lower material output are symbolized by dashed arrows.

In 2 is a height conveyor 22nd shown, by means of which the material to be dried in the for the height H of the device 1 required height can be conveyed so that the material on the upper drying surface 2a of the top pair of drying surfaces 2 can be applied. The height conveyor can be a thick matter pump.

List of reference symbols

1

contraption

2

Pair of drying surfaces

2a

upper drying area

2 B

lower drying area

3

Conveyor

4th

Conveying elements

5

Traction means

6th

wheel

7th

Drive device

8th

Drying surface heating device

9

Moisture sensor for the material

10

Shredding device

11

casing

12th

Air supply

13th

Air evacuation

14th

Air supply heater

15th

Air supply fan

16

Air exhaust fan

17th

Exhaust filter system

18th

Noise filter

19th

Filter insert

20th

Control and / or regulating device

21

Closing flaps

22nd

Elevator

Claims (14)

Device (1) for drying material, in particular biomass, for example sewage sludge, with one or more pairs of drying surfaces (2), each pair of drying surfaces (2) having an upper drying surface (2a) and a lower drying surface (2b) which the material can be conveyed for drying, with each pair of drying surfaces (2) having a conveyor device (3) running around the upper drying surface (2a) with conveyor elements (4) for conveying the material over the upper drying surface (2a) and the lower drying surface ( 2b), the upper drying surface (2a) and the lower drying surface (2b) as well as the conveying device (3) and its conveying elements (4) being designed and arranged to one another in such a way that the conveying elements (4) for conveying the material over the upper drying surface (2a) and for conveying the material over the lower drying surface (2b) are moved in opposite directions, whereby the upper drying surface (2a) is arranged relative to the lower drying surface (2b) in such a way that the material falls from the upper drying surface (2a) onto the lower drying surface (2b) after being conveyed over the upper drying surface (2a) for subsequent conveyance over the lower drying surface (2b), characterized in that the device (1) has one or more moisture sensors (9) for determining the moisture content of the material and / or one or more moisture sensors for determining the humidity in the device (1) and / or outside the device (1) and / or has one or more temperature sensors for determining the air temperature in the device (1) and / or outside the device (1), and that the device has a control and / or regulating device (20) which is used for signal transmission with the humidity sensors (9 ) for the material and / or for the air and / or the temperature sensors and / or controllable and / or regulatable components of the device (1), for example air supply heating devices (14) and / or air supply fans (15) for supplying air into the device (1) and / or air removal fans (16) for removing air from the device (1) and / or drying surface heating devices (8) and / or drive devices (7) of the conveying devices (3) and / or closing flaps (21) of the air supply devices (12) and / or a supply device, in particular a height conveyor (22) for the material to be dried is connected. Device (1) according to Claim 1 , characterized in that the control and / or regulating device (20) is set up in such a way that, by means of the signal transmission, incoming measured values of the moisture sensors (9) for the material and / or for the air and / or the temperature sensors can be or are processed and on the basis of this processing control signals by means of signal transmission to the controllable and / or regulatable components of the device (1), for example to the air supply heating device (s) (14) and / or to the air supply fan (s) (15) and / or the air discharge fan (s) (16) and / or the drying surface heating device (s) (8) and / or the drive device (s) (7) of the conveying devices (3) and / or the closing flaps (21) of the air inlets (12) and / or the feed device, in particular the height conveyor device (22), for the material to be dried can be or will be transferred. Device (1) according to Claim 1 or 2 , characterized in that the device (1) has one or more shredding devices (10), in particular choppers, for shredding the material during drying, in particular at the transition between two drying surfaces (2a, 2b), for example from the upper drying surface (2a) the lower drying surface (2b), and / or at the end of the drying, in particular before leaving the device (1), preferably for producing a defined grain size. Device (1) according to Claim 3 , characterized in that the shredding device (10) is driven by one of the conveying devices (3). Device (1) according to one of the preceding claims, characterized in that the device (1) has a housing (11) which encloses the pairs of drying surfaces (2) with their associated conveying devices (3), the housing (11) having a or a plurality of air inlets (12) and one or more air outlets (13) which are arranged in such a way that the air for drying the material is guided through the device (1), the air inlet (12) or the air inlets (12) being a Air supply heating device (14), in particular an air supply heat exchanger, for heating the supplied air. Device (1) according to Claim 5 , characterized in that the air supply (12) or the air supply (12) has an air supply fan (15) to support the air supply into the housing (11). Device (1) according to Claim 5 or 6th , characterized in that the air discharge (13) has an air discharge fan (16) to support the air discharge from the housing (11). Device (1) according to one of the preceding Claims 5 to 7th , characterized in that the air discharge (13) has an exhaust air filter system (17), in particular for odor filtering, and / or a noise filter (18). Device (1) according to Claim 8 , characterized in that the exhaust air filter system (17) comprises one or more particle filters and / or an activated carbon filter. Device (1) according to Claim 8 or 9 , characterized in that the exhaust air filter system (17) is a plug-in filter system with one or more, in particular one to five, for example three, replaceable filter inserts (19), the filter inserts (19) being equipped, for example, with particle filters and / or an activated carbon filter. Device (1) according to one of the preceding claims, characterized in that the upper drying surfaces (2a) and / or the lower drying surfaces (2b) can be heated at least in sections, preferably completely, by means of a drying surface heating device (8). Device (1) according to one of the preceding claims, characterized in that at least four or at least eight or at least sixteen pairs of drying surfaces (2) are arranged one above the other in such a way that the material can be or is conveyed successively over all drying surfaces (2a, 2b) and falls from the lower drying surface (2b) of the respective upper pair of drying surfaces (2) onto the upper drying surface (2a) of the respective lower pair of drying surfaces (2) until the lower drying surface (2b) of the lowest pair of drying surfaces (2 ) is reached. Device (1) according to one of the preceding claims, characterized in that at least eight pairs of drying surfaces (2) are arranged one above the other and the device (1) has a height (H1) of at least 6 meters, or that at least sixteen pairs of drying surfaces (2) are arranged one above the other and the device (1) has a height (H) of at least 12 meters. Device (1) according to one of the preceding claims, characterized in that for feeding the material to be dried to the upper drying surface (2a) of the uppermost pair of drying surfaces (2) a thick matter pump is provided.

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