PAINT SYSTEM WITH CO2 SEPARATOR

Abstract

The invention relates to a painting system (2) with a filter device (14), wherein the painting system (2) comprises: a painting booth (4), an air supply device (6) for supplying air (Z) to the painting booth (4), an exhaust air device (8) for removing exhaust air (A) from the painting booth (4), and a blower device (10) for generating an airflow through the air supply device (6), the painting booth (4), and the exhaust air device (8). The filter device (14) removes at least CO2 from the airflow and is arranged in the air supply device (6) and / or the exhaust air device (8).

Description

The invention relates to a painting system with a filter device. In paint booths, such as those used in automotive paint shops, a high airflow with laminar flow is required to ensure a uniform paint finish. The exhaust air contains not only aerosols but also CO2, which is released through energy consumption and chemical processes within the booth. Conventional filter systems for paint systems only remove the paint aerosols from the exhaust air of the paint booth to reduce aerosol emissions. The object of the invention is to provide a painting system in which the ecological footprint is reduced. This problem is solved by the features of claim 1. Specific embodiments are the subject of the dependent claims. According to claim 1, a painting system with a filter device is provided. The painting system comprises a painting booth, an air supply device for supplying fresh air to the painting booth, an exhaust device for removing exhaust air from the painting booth, and a blower device for generating an airflow through the air supply device, the painting booth, and the exhaust device. The filter device separates at least CO2 from the airflow (i.e., filters CO2 out of the airflow) and is arranged in the air supply device and / or preferably in the exhaust device. The filter system filters out the CO2 present in the airflow, thereby reducing the CO2 emissions of the paint shop, which in turn leads to a reduction in the ecological footprint of the paint shop. Supply air is the air flowing into the paint booth, and exhaust air is the air flowing out of the paint booth. In one embodiment, particularly during a painting process in the paint booth, the supply air is preferably outside air from outside the paint booth (i.e., the supply air corresponds to the ambient air outside the paint booth). The outside air typically contains approximately 420 ppm CO2, which can be separated or filtered out of the air by the filter system. In this case, the exhaust air from the paint booth is preferably completely removed and not supplied to the paint booth as supply air. In a further embodiment, particularly during a drying process in the paint booth, the exhaust air system is connected to the supply air system, and the supply air can be outside air to which a portion of the exhaust air is mixed (i.e., the supply air in this case is a mixture of outside air (from the environment) and exhaust air (from the paint booth)). For example, the exhaust air from the exhaust air system can be recirculated by the fan system and partially fed back into the supply air system (preferably by mixing it with outside air). Preferably, the paint system has an outside air supply device that is connected to the supply air device and is designed to supply outside air (ambient air) from outside the paint booth to the supply air device. The exhaust air device can be connected to the outside air supply device by means of an outside air / exhaust air mixing device. Preferably, the outside air / exhaust air mixing device can assume at least two operating states. In a first (closed) operating state of the outside air / exhaust air mixing device, the exhaust air system is separated from the outside air supply system by the outside air / exhaust air mixing device, so that no exhaust air from the paint booth can flow from the exhaust air system into the outside air supply system. In this case, the supply air in the supply air system corresponds to the outside air, and all the exhaust air from the paint booth is extracted from the paint system; that is, no portion of the exhaust air is supplied as supply air (no recirculation). Preferably, the first operating state is used during a painting process in the paint booth, during which painters may be present inside the paint booth. In a second operating state of the outside air / exhaust air mixing device, the exhaust air system is connected to the outside air supply system via the mixing device, allowing at least a portion of the exhaust air to flow from the exhaust air system into the outside air supply system (this is recirculation or partial recirculation operation). In this case, the supply air in the supply air system is a mixture of outside air and exhaust air; that is, only a portion of the exhaust air from the paint booth is removed from the paint system. Preferably, the second operating state is used during a drying process in the paint booth, with a portion of the exhaust air mixed into the supply air. For example, 15% of the exhaust air from the paint booth can be removed, and 85% of the exhaust air from the paint booth can be mixed with outside air, and the mixture of both can be supplied to the paint booth as supply air.The mixing ratio of outside air from the environment to the exhaust air from the paint booth, which is then supplied to the paint booth, can be in the range of 0% (pure recirculation operation) to 50%, preferably in the range of 10% - 40%, 20 - 30%. In one embodiment, the outside air-exhaust air mixing device is designed as a flap element which, in the first operating state, closes an opening between the exhaust air device and the outside air supply device, so that no exhaust air can flow from the exhaust air device into the outside air supply device, and in (at least) the second operating state, opens or releases the opening between the exhaust air device and the outside air supply device, so that exhaust air can flow from the exhaust air device into the outside air supply device. Preferably, the paint booth has a heating element for heating the air in the airflow, particularly during a drying process. The heating element can be, for example, a gas burner, such as a gas surface burner, wherein the gas preferably burns freely (e.g., without a heat exchanger) in the supplied or recirculated air that enters the paint booth. The heating element is preferably arranged in the supply air system (preferably downstream of the outside air / exhaust air mixing unit). Preferably, the heating element is in operation during a drying process in the paint booth to heat the supply air and thereby accelerate the drying process within the paint booth. The filter system generally removes CO2 from the airflow through the paint shop, and in particular both the CO2 present in the outside air and the CO2 produced by the operation of the gas burner. This means that in both operating states of the outside air / exhaust air mixing system, the filter system reduces the CO2 emissions from the paint shop, even in an operating mode where the paint shop itself does not produce CO2. The filter device is preferably arranged in the exhaust air system. In particular, the filter device in the exhaust air system can be arranged upstream of the outside air / exhaust air mixing device or downstream of the outside air / exhaust air mixing device. If the filter device in the exhaust air system is arranged upstream of the outside air / exhaust air mixing device, the CO2 is filtered out of the entire exhaust air from the paint booth, including the portion of the exhaust air that is supplied as supply air. If the filter device in the exhaust air system is arranged downstream of the outside air / exhaust air mixing device, the CO2 is filtered out only from the portion of the exhaust air from the paint booth that is exhausted and not supplied as supply air. Amine filtration Preferably, the filter device comprises at least one filter element containing a CO2 absorbent that binds CO2. The filter element can, for example, be designed as a flat and / or planar filter element. Alternatively or additionally, the filter device or the filter element can include a gas scrubber filled with the CO2 absorbent or be designed as such. Preferably, the CO2 absorbent is a CO2 chemisorption agent, wherein the CO2 absorbent is or comprises amines and / or amine mixtures. When the airflow passes through the filter element, chemical reactions take place on the surface of the filter element, in particular chemisorption or amine sorption, which bind the CO2 in the absorbent within the filter element and thus reduce the CO2 content of the airflow. Preferably, the at least one filter element comprises a carrier material that is coated with the CO2 absorbent and / or in which the CO2 absorbent is incorporated and / or which is impregnated with the CO2 absorbent. The carrier material can, for example, be an aerosol filter element. Preferably, the filter element filters both aerosols or dust and CO2 from the airflow. Filter with humidification Preferably, the filter device includes a spray device (or a wetting device) that applies the CO2 absorbent to the at least one filter element. The spray device is preferably a humidification device that moistens the at least one filter element with the CO2 absorbent. Alternatively or additionally, the filter device or the filter element can include a gas scrubber partially filled with the CO2 absorbent or be designed as such. The filter element can be arranged within the gas scrubber. During CO2 filtration, the CO2 absorbent on the filter element reaches a saturation point after a certain period, reducing the efficiency of the CO2 filtration process. Re-wetting the filter element with fresh CO2 absorbent using the application device ensures consistently effective CO2 filtration. Furthermore, the application device eliminates the need to remove the filter element for humidification with the CO2 absorbant, thus improving the work efficiency of the painting system and minimizing disruption to its operation. Preferably, the at least one filter element comprises the carrier material that is actuated by the actuation device. Preferably, the application device is a humidification device that moistens the at least one filter element with the CO2 absorbent by means of at least one spray nozzle. Alternatively or additionally, the application device is a humidification device that includes a container with CO2 absorbent. Advantageously, at least part of the at least one filter element is immersed in the CO2 absorbent in the container, so that, for example, the CO2 absorbent is distributed over the surface of the filter element due to capillary action. Preferably, the CO2 absorbent is in the form of a liquid, in particular a solution, for example an aqueous solution of the CO2 absorbent. The humidification by means of at least one spray nozzle is carried out, for example, over a large area of ​​at least a large proportion of the surface of the filter element or by humidifying the upper area of ​​the filter element, so that the CO2 absorbent flows down over the entire surface of the filter element by gravity. By moistening the filter element with a spray nozzle or immersing it in the container with CO2 absorbant, the filter element can be repeatedly supplied with fresh CO2 absorbant, thus reducing the frequency of removing the filter element to replenish the CO2 absorbant. This saves time and increases the efficiency of the paint shop. Circulation system Preferably, the application device comprises a circulation device with a collection device associated with the filter element for collecting liquid CO2 absorbent, a pump and a return system, wherein the pump is designed to draw the liquid CO2 absorbent from the collection device and return it via the return system to at least a part of the surface of the filter element. The recirculation system captures excess CO2 absorbene, allowing it to be reused and thus saving on material costs. Furthermore, the CO2 absorbene in the paint shop lasts for a longer period, reducing the need for frequent refills. The filter device can also have several filter elements arranged in series for CO2 filtration. In this case, the application device is preferably designed such that it can apply or moisten each filter element with the CO2 absorbent. If multiple filter elements are used for CO2 filtration, the collection device is preferably assigned to all filter elements. The collection device can, for example, be designed as a collection tray located below the filter element(s). Saturation measurement Preferably, a measuring device is associated with the filter device, which is designed to measure the saturation state of the CO2 absorbent with CO2, and / or to measure the CO2 content in the airflow behind the at least one filter element and optionally additionally in front of the at least one filter element. Preferably, the CO2 absorbent is in liquid form and the measuring device includes a conductivity sensor or a pH sensor. Alternatively or additionally, the measuring device includes an optical sensor designed to detect the optical state and thus preferably the CO2 saturation level of the CO2 absorbent. Preferably, the measuring device is connected to a display device that informs a user about the saturation state of the CO2 absorbent. By detecting and monitoring the saturation level of the CO2 absorber with CO2 and / or the CO2 content in the airflow, it is possible to ensure that the CO2 absorber or the filter element containing the CO2 absorber is only replaced when necessary due to decreasing CO2 filtration. This reduces material costs for the CO2 absorber and avoids downtime of the paint shop caused by unnecessary replacement or renewal of the filter element. Preferably, the measuring device includes a control unit configured to control the application device such that, upon reaching a predefined saturation state of the CO2 absorbent and / or a predefined CO2 concentration in the airflow, the filter element for CO2 filtration is supplied with new CO2 absorbent. This eliminates the need for active user intervention in the process. Filter system Preferably, the filter device has at least one aerosol filter element for filtering aerosols and / or dust, which is arranged in the direction of flow upstream of the CO2 filter element, and / or the CO2 filter element is further designed to filter aerosols and / or dust. Preferably, the aerosol filter element and the CO2 filter element are arranged in the exhaust air system, particularly preferably downstream of the outside air / exhaust air mixing device. Furthermore, a further aerosol filter element is preferably arranged in the supply air system, preferably upstream of the heating element and / or downstream of the outside air supply device. The aerosol filter element, located upstream of the CO2 filter element, filters aerosols and dust from the airflow, thus preventing or reducing contact between the CO2 filter element and aerosols and / or dust. This ensures that the efficiency of the CO2 filter element is not, or not significantly, negatively affected by aerosols and / or dust, allowing the filter element to guarantee reliable CO2 filtration. Furthermore, this allows the CO2 filter element to be regenerated and reused. Preferably, the filter device has a filter holder, in particular a slide-in holder, for each of the filter elements, wherein the filter surface of the filter element is oriented perpendicular to the direction of airflow through the filter device or at an angle of 45° to 90° to the direction of airflow. For example, the filter holder for a filter element can have two opposing U-profiles into which the filter element is inserted or can be inserted laterally. The filter holder allows for easy and quick removal and cleaning of the existing filter element and replacement of the existing filter element with a new filter element. Partial recirculation / heat exchanger Preferably, the supply air system and the exhaust air system are connected by an outside air / exhaust air mixing device, and this mixing device, preferably with selectability and / or an adjustable mixing ratio, supplies a portion of the exhaust air to the supply air system as supply air. Alternatively or additionally, the supply air system and the exhaust air system are connected by a heat exchanger that transfers heat from the exhaust air to the supply air. Regeneration / Recycling The filter device described above is advantageous, and / or the filter element described above and / or the filter element of a paint system is regenerable or recyclable in a recycling or regeneration facility. In particular, a CO2-saturated filter element can be removed from the paint system, regenerated to an unsaturated filter element in the recycling or regeneration facility, and then reintroduced into the paint system, preferably a paint system as described above or below. This further reduces material consumption. Furthermore, a method for regenerating a filter element of a paint system, in particular a paint system as described above or below, is provided.The process involves: removing a CO2-saturated filter element from one or the filter holder of the paint shop, transferring the filter element to a recycling or regeneration facility, recycling or regenerating the filter element in the recycling or regeneration facility, returning the recycled or regenerated filter element to the paint shop, and installing the filter element into the filter holder in the paint shop. Furthermore, a method for regenerating a CO2 absorbent, in particular a CO2 absorbent at least partially saturated with CO2, in a paint shop, especially a paint shop as described above or below, is provided. The method comprises: removing a CO2 absorbent from a receptacle in the paint shop, transferring the CO2 absorbent to a recycling or regeneration unit, recycling or regenerating the CO2 absorbent in the recycling or regeneration unit, returning the recycled or regenerated CO2 absorbent to the paint shop, and installing or filling the CO2 absorbent into the receptacle in the paint shop. Individual features disclosed above or below in this description or in the claims may be claimed in any combination or subcombination with one another. Features of the painting system and the methods may be combined with one another as a single feature or in any subcombination of features. When the conjunction "and / or" is used here, all logical elements and combinations are disclosed individually; e.g., a, b and / or c discloses the elements / combinations a, b, c, ab, ac, bc and abc. Embodiments of the invention are explained in more detail with reference to the figures. They show: Fig. 1 a schematic side cross-section of a painting system in a first operating state, Fig. 2 a schematic side cross-section of the painting system from Fig. 1 in a second operating state, and Fig. 3 a schematic side cross-section of the filter device from Fig. 1. Fig. 1 shows a schematic side cross-section of a paint shop 2 in a first operating state. The paint shop 2 comprises a paint booth 4, an air supply unit 6 for supplying fresh air Z into the paint booth 4, an exhaust air unit 8 for removing exhaust air A from the paint booth 4 via an exhaust air outlet 13, and a blower unit 10 for generating an airflow through the air supply unit 6, the paint booth 4, and the exhaust air unit 8. In Figs. 1, 2 to 3, the direction of airflow is indicated by arrows. The paint booth 4 has one or more inlets for supplying fresh air into the paint booth 4 via the air supply unit 6 and one or more outlets for removing exhaust air from the paint booth 4 via the exhaust air unit 6. Furthermore, the paint shop has a filter device 14, which is arranged in the exhaust air system 8 and is designed to separate or filter out at least CO2 from the airflow. In an alternative embodiment, the filter device 14 can be arranged in the supply air system 6. The filter unit 14 filters out the CO2 present in the airflow, thereby reducing the CO2 emissions of the paint shop 2, which in turn leads to a reduction in the ecological footprint of the paint shop. Preferably, the painting system 2 has a heating element 44 for heating the air in the airflow. The heating element 44 can, for example, be a gas burner. The heating element 44 is preferably arranged in the supply air device. Preferably, the heating element 44 is in operation during a drying process in the painting booth 4 in order to heat the supply air and thereby accelerate the drying process within the painting booth 4. The air supply unit 6 can have at least one aerosol filter element 41 for filtering aerosols and / or dust. The aerosol filter element 41 is preferably arranged upstream of the heating element 44 and / or the blower unit 10. The paint system 2 can have an outside air supply device 7, which is connected to the supply air device 6 and is configured to supply outside air L from outside the paint booth 4 via an outside air inlet of the supply air device 6. The exhaust air device 8 can be connected to the supply air device 6 or the outside air supply device 7 by means of an outside air / exhaust air mixing device 20, and the outside air / exhaust air mixing device 20 can, preferably optionally and / or with an adjustable mixing ratio, supply a portion of the exhaust air A as supply air Z to the supply air device 6. As shown in Fig. 1, the outside air / exhaust air mixing device 20 can, for example, be designed as a damper element. Preferably, the outside air / exhaust air mixing device 20 can assume two operating states. As shown in Fig. 1, in a first operating state of the outside air / exhaust air mixing device 20 (i.e., damper element open), the exhaust air device 8 is connected to the outside air supply device 7 via the outside air / exhaust air mixing device 20, so that at least a portion of the exhaust air A can flow from the exhaust air device 8 into the outside air supply device 7. In this case, the supply air Z in the supply air device 6 corresponds to a mixture of outside air L and exhaust air A, i.e., only a portion of the exhaust air A from the paint booth 4 is discharged from the paint system 2. Preferably, the first operating state is used during a drying process in the paint booth, in which the air flowing through the paint booth 4 is heated by the heating element 44.For example, 15% of the exhaust air A from the paint booth 4 can be extracted and 85% of the exhaust air A from the paint booth 4 can be mixed with outside air L using the outside air-exhaust air mixing device 20 and the mixture of both can be supplied as supply air Z to the paint booth 4. As shown in Fig. 2, in a second operating state of the outside air / exhaust air mixing device 20 (i.e., damper element closed), the exhaust air device 8 is separated from the supply air device 6 or the outside air supply device 7 by the outside air / exhaust air mixing device 20, so that no exhaust air A from the paint booth 4 can be supplied by the exhaust air device 8 as supply air Z. In this case, the supply air Z in the supply air device 6 corresponds to the outside air L, and all the exhaust air A from the paint booth 4 is discharged from the paint system 2; that is, in contrast to the first operating state in Fig. 1, no portion of the exhaust air A is supplied as supply air Z in Fig. 2. Preferably, the second operating state is used during a painting process in the paint booth 4, when painters are present inside the paint booth (and the heating element is preferably not in operation). As shown in Figs. 1 and 2, the blower unit 10 is preferably arranged in the supply air unit 6 and is designed to draw in the supply air and convey it through the paint booth 4. Furthermore, another blower unit 11 can be provided in the exhaust air unit 8 for removing the exhaust air. The blower unit 11 is preferably arranged in the exhaust air unit 8 downstream of the outside air / exhaust air mixing unit 20. As shown in Fig. 1 and Fig. 2, the filter device 14 in the exhaust air device 8 is preferably arranged downstream of the outside air / exhaust air mixing device 20. Alternatively, the filter device 14 in the exhaust air device 8 can be arranged upstream of the outside air / exhaust air mixing device 20 (see dashed filter device 14 in Fig. 1). Fig. 3 shows a schematic side cross-section of the filter device 14 from Fig. 1. The filter device 14 preferably has at least one filter element 16 comprising a CO2 absorbent 17 that binds CO2. The filter element 16 can have a support material 18 that is coated or moistened with the CO2 absorbent 17. The support material 18 can, for example, be an aerosol filter element. The CO2 absorbent 17 is preferably a CO2 chemical sorbent, wherein, in particular, the CO2 absorbent is or comprises amines and / or amine mixtures. The filter device 14 can have at least one aerosol filter element 40 for filtering aerosols and / or dust, which is arranged in the direction of flow upstream of the filter element 16 for CO2 filtration. The filter assembly 14 preferably has a filter holder 42, in particular a slide-in holder, for receiving each of the filter elements 16, 40. The filter holder 42 can, for example, be designed as opposing U-profiles between which the filter element 16 can be inserted. This simplifies the disassembly and replacement of the filter element 16. In the assembled state, the filter surface of the filter elements 16, 40 can be oriented at an angle of 45° to 90° to the direction of flow of the airflow or exhaust air A. Alternatively, the filter elements 16, 40 can be oriented perpendicular to the direction of flow of the airflow or exhaust air A through the filter assembly 14 in the assembled state. The filter assembly 14 can include a spray device 22 that sprays the filter element 16, and in particular the support material 18, with the CO2 absorbent 17. The spray device 22 is preferably a humidification device that moistens or sprays the at least one filter element with the CO2 absorbent. As shown in Fig. 3, the spray device 22 can be a humidification device that moistens or wets the filter element 16 with the CO2 absorbent 17 by means of at least one spray nozzle 24. The spray nozzle 24 is preferably arranged above the filter element 16 or in an upper region of the filter element 16. The application device 22 can include a circulation device 26 with a collection device 30 associated with the filter element 16, a pump 28, and a return line 32. The collection device 30 can, for example, be a drip tray located below the filter element 16 and designed to collect excess CO2 absorbent that drips downwards. The pump 28 can draw the liquid CO2 absorbent from the collection device 30 and return it via the return line 32 to at least part of the surface of the filter element 16. The circulation device 26 makes it possible to collect and reuse excess CO2 absorbent, thereby saving material costs. The paint shop 2 can have a measuring device 34 associated with the filter unit 14. As shown in Fig. 3, the measuring device 34 is preferably configured to measure the saturation state of the CO2 absorbent 17 with CO2 by means of sensors 35a, 35b. For example, a sensor 35a can be provided that measures the saturation state of the CO2 absorbent 17 with CO2 at the filter element 16 and / or a sensor 35b can be provided that measures the saturation state of the CO2 absorbent 17 with CO2 in the collection unit 30. The measurement of the saturation state can be carried out, for example, by an optical sensor designed to detect the optical state of the CO2 absorbent (see sensor 35a). If the CO2 absorbent 17 is in liquid form, the saturation state can be measured by a conductivity sensor or a pH sensor (see sensor 35b in collection device 30). Alternatively or additionally to measuring the saturation state of the CO2 absorbent 17 with CO2, the measuring device 34 can measure the CO2 content in the airflow downstream of the filter element 16 and optionally also upstream of the filter element 16. Based on the measurement of the CO2 content in the airflow, the saturation state of the CO2 absorbent 17 with CO2 can be assessed. The measuring device 34 preferably includes a controller 36 that receives and processes the measurement data from sensors 35a, 35b. The controller 36 is preferably connected to a display device 37 that informs a user about the saturation state of the CO2 absorbent. The application device 22 can be controlled based on the measurement data from sensors 35a, 35b. For example, if the saturation state of the CO2 absorbent exceeds a predefined value, the controller can inform the user that a replacement of the filter element 16 or a renewal of the CO2 absorbent is necessary, or it can cause the application device 22 to apply or spray the filter element 16 with new CO2 absorbent 17. Reference symbol list: 2 Paint system 4 Paint booth 6 Supply air system 7 Outdoor air supply system 8 Exhaust system 10, 11 Blower system 12 Outdoor air inlet 13 Exhaust outlet 14 Filter system 16 Filter element for CO2 filtration 17 CO2 absorber 18 Carrier material 20 Outdoor air / exhaust air mixing system (flap element) 22 Spraying system (wetting system) 24 Spray nozzle 26 Circulation system 28 Pump 30 Collection system 32 Recirculation 34 Measuring system 35a, 35b Sensor 36 Control unit 37 Display system 40, 41 Aerosol filter element 42 Filter holder 44 Heating element (gas burner) L Outdoor air Z Supply air A Exhaust air

Claims

Painting system (2) with a filter device (14), wherein the painting system (2) comprises: a painting booth (4), a supply air device (6) for supplying supply air (Z) into the painting booth (4), an exhaust air device (8) for removing exhaust air (A) from the painting booth (4), and a blower device (10) for generating an airflow through the supply air device (6), the painting booth (4) and the exhaust air device (8), wherein the filter device (14) separates at least CO2 from the airflow and is arranged in the supply air device (6) and / or the exhaust air device (8). Paint system according to claim 1, wherein the filter device (14) has at least one filter element (16) which has a CO2 absorbent (17) that binds CO2. Painting system according to claim 2, wherein the CO2 absorbent (17) is a CO2 chemisorbent, wherein in particular the CO2 absorbent is or comprises amines and / or amine mixtures. Paint system according to claim 2 or 3, wherein the at least one filter element (16) has a carrier material (18) which is coated with the CO2 absorbent (17) and / or which is incorporated into the CO2 absorbent (17) and / or which is impregnated with the CO2 absorbent. Paint system according to one of claims 2 to 4, wherein the filter device (14) has an application device (22) which applies the CO2 absorbent (17) to the at least one filter element (16), wherein in particular the application device (22) is a humidification device which humidifies the at least one filter element with the CO2 absorbent, and / or wherein the at least one filter element (16) has a carrier material (18) which is applied by the application device (22). Painting system according to claim 5, wherein the application device (22) is a humidification device which: humidifies the at least one filter element (16) by means of at least one spray nozzle (24) with the CO2 absorbent (17), and / or has a container with CO2 absorbent contained therein and wherein at least a part of the filter device (14) is immersed in the CO2 absorbent in the container, so that the CO2 absorbent is distributed over the surface of the filter device due to capillary action. Paint coating system according to claim 5 or 6, wherein the application device (22) has a circulation device (26) with a collection device (30) associated with the filter element (16) for collecting liquid CO2 absorbent, a pump (28) and a return (32), wherein the pump (28) is configured to draw the liquid CO2 absorbent from the collection device (30) and return it via the return (32) to at least a part of the surface of the filter element (16). Paint system according to one of claims 2 to 7, wherein the filter device (14) is associated with a measuring device (34) which is designed to: measure the CO2 content in the airflow downstream of the at least one filter element (16) and optionally additionally upstream of the at least one filter element (16), and / or measure the saturation state of the CO2 absorbent (17) with CO2, wherein in particular the CO2 absorbent (17) is in liquid form and the measuring device (34) has a conductivity sensor or a pH sensor, and / or wherein the measuring device (34) has an optical sensor designed to detect the optical state of the CO2 absorbent. Painting system according to claim 8, wherein the measuring device (34) is connected to a display device (37) which informs a user about the saturation state of the CO2 absorbent. Paint system according to one of claims 2 to 9, wherein the filter device (14) has at least one aerosol filter element (40) for filtering aerosols and / or dust, which is arranged in the direction of flow upstream of the filter element (16) for CO2 filtration, and / or wherein the filter element (16) for CO2 filtration is further configured for filtering aerosols and / or dust. Paint system according to one of claims 2 to 10, wherein the filter device (14) has a filter holder (42), in particular a slide-in holder, for each of the filter elements (16, 40), wherein the filter surface of the filter element (16, 40) is oriented perpendicular to the direction of flow of the airflow through the filter device (14) or is oriented at an angle in the range of 45° to 90° to the direction of flow. Paint shop according to a preceding claim, wherein the supply air device (6) and the exhaust air device (8) are connected to each other by an outside air-exhaust air mixing device (20) and the outside air-exhaust air mixing device (20), preferably adjustable, supplies a portion of the exhaust air as supply air to the supply air device, and / or wherein the supply air device (6) and the exhaust air device (8) are connected to each other by a heat exchanger device which transfers heat from the exhaust air to the supply air. Paint shop according to one of the preceding claims, wherein the filter element (16) is regenerable or recyclable in a recycling or regeneration facility, wherein a CO2-saturated filter element (16) can be removed from the paint shop (2), and wherein the filter element (16) can be regenerated or recyclable in the recycling or regeneration facility to become an unsaturated filter element and can then be reintroduced into the paint shop (2). A method for regenerating a filter element (16) or a CO2 absorbent (17) of a painting system (2), in particular a painting system according to one of the preceding claims, wherein the method comprises: removing a CO2-saturated filter element (16) or a CO2 absorbent (17) from a receptacle of the painting system (2), transferring the filter element (16) or the CO2 absorbent (17) to a recycling or regeneration unit, recycling or regenerating the filter element (16) or the CO2 absorbent (17) in the recycling or regeneration unit, returning the recycled or regenerated filter element (16) or the CO2 absorbent (17) to the painting system, and installing or filling the filter element (16) or the CO2 absorbent into the receptacle in the painting system.

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