CO2 separation device for separating CO2 from a supplied air stream

Abstract

A CO2 separation device for separating CO2 from a supplied air stream (104) by means of a CO2 release process is presented, comprising a separation chamber (15) for receiving a CO2 separation agent (107) and a water vapor generation unit (12) for providing water vapor in the separation chamber (15) for the CO2 release process, wherein the water vapor generation unit (12) for providing the water vapor has at least one heating surface (16) arranged in the separation chamber (15) for evaporating water arranged thereon and at least one cooling surface (20) arranged in the separation chamber (15) for condensing water evaporated in the separation chamber (15) for re-evaporation.

Description

State of the art

[0001] The invention relates to a CO2 separation device for separating CO2 (carbon dioxide) from a supplied air stream by means of a CO2 release process, comprising a separation chamber for receiving a CO2 separation agent and a water vapor generation unit for providing water vapor in the separation chamber for the CO2 release process. The invention further relates to a method for separating CO2 from a supplied air stream by means of a CO2 separation device, comprising a separation chamber for receiving a CO2 separation agent and a water vapor generation unit for providing water vapor in the separation chamber for a CO2 release process.

[0002] In order to limit the warming of the Earth's atmosphere, so-called DAC systems (Direct Air Capture) are used to separate or remove CO2 (carbon dioxide) from the air.

[0003] Since the binding of CO2 and possibly water to an adsorbent material depends on temperature, pressure, concentration, humidity, etc., all adsorption and desorption systems cyclically adjust different conditions to capture CO2 through the resulting hysteresis. To adjust the desorption conditions, the adsorbent material must be temporarily sealed off from the environment and is therefore located in a chamber.

[0004] The chamber usually goes through the following steps cyclically: (1) Adsorption of ambient air with the chamber open; (2) Closing the chamber and heating the adsorber material and inevitably also the metallic chamber structure; (3) Desorption of CO2 and bound water by supplying heat at reduced pressure (e.g. 200 to 400 mbar) and pumping out the CO2 and the vaporous water by means of a vacuum pump; (4) Cooling the adsorber material and the chamber and optionally drying the adsorber material to below a critical temperature below which contact with ambient air no longer leads to increased degeneration of the adsorber material by atmospheric oxygen; (5) Opening the chamber to the environment, cooling to ambient temperature and thus resuming adsorption of CO2 and water from the ambient air.

[0005] Even cold, dry air contains more water molecules than CO2 molecules, so water is always adsorbed. During desorption under negative pressure, approximately three water molecules are released in the form of water vapor for every one molecule of CO2 gas. Thus, three out of four volume fractions are water vapor.

[0006] WO 2020 / 212146 A1 discloses a DAC (Direct Air Capture) system with a container solution, wherein six separation chambers arranged in series and operable in parallel are provided inside the container.

[0007] WO 2021 / 239747 A1 discloses a process for the adsorption and desorption of a sorbent used in cyclic adsorption-desorption to capture CO2 directly from atmospheric ambient air or highly diluted sources. After the adsorption chamber is sealed, steam is injected to displace residual oxygen, which would lead to adsorbent material degradation at elevated temperatures. Furthermore, the steam is used to directly heat the adsorbent material and provide the energy for desorption. Finally, the steam serves as an inert gas with which the CO2 is pumped out of the chamber.

[0008] Since heat transfer through the air-permeable adsorber material is poor in a vacuum, heating energy is provided outside the chamber in the form of superheated steam, and the vaporous water is condensed out before the vacuum pump. Since both the heating and cooling systems are located outside the CO2 adsorption / desorption chamber, the following disadvantages arise, leading to unnecessarily high investment and energy requirements: - Since at temperatures of 80°C to 120°C desorption temperature, the water from the desorption process is always in vapor form under negative pressure, cooling is required upstream of the vacuum pump in technical designs to relieve the vacuum pump through water condensation beforehand, i.e., upstream of the vacuum pump. A cost-effective vacuum pump design is the water ring pump, which, due to the saturation vapor pressure, can only achieve a low ultimate pressure if the temperature inside the pump is as low as possible. Typical pump temperatures are between 5°C and 20°C; - Cooling is achieved according to the state of the art using a condenser outside the chamber. After leaving the chamber, the CO2 to be pumped out is passed through a cold trap to precipitate as much desorbed water as possible before reaching the vacuum pump. This requires a significantly larger pipe cross-section for 1 mol CO2 + 3 mol water, rather than 1 mol CO2. - In large systems, a vacuum-resistant steam condenser for water is installed upstream of the vacuum pump. This condenser is cooled by cooling water or cold water. Like the chamber itself, the condenser is constructed of corrosion-resistant material, e.g., expensive special stainless steel such as nickel-based steel. The condensation enthalpy must still be used to desorb the water, but is usually "disposed of" via the cooling water, since the desired low cooling water temperatures mean that the residual energy cannot be used economically. - The lowest possible cooling temperatures are technically desired in order to precipitate as much desorbed water as possible via the lowest possible dew point right at the beginning of the CO2 process chain, thus minimizing conditioning effort for subsequent process steps. Furthermore, since CO2 leads to low pH values ​​in humid environments (acidic condensate), strong dehumidification is desired in order to be able to use at least standard stainless steels (typically: precipitate the water to at least 18 bar pressure at 25 °C = first compression stage). Compression, filling, transport, or further use generally require anhydrous residual water content of around 210 ppm in the CO2. Disclosure of the invention

[0009] The present invention relates to a CO2 separation device according to independent claim 1, wherein the water vapor generation unit for providing the water vapor has at least one heating surface arranged in the separation chamber for evaporating water arranged thereon and at least one cooling surface arranged in the separation chamber for condensing water evaporated in the separation chamber for re-evaporation.

[0010] The present invention further relates to a method according to independent claim 12, wherein water arranged on the separation chamber is evaporated by means of a heating surface arranged therein in order to provide the water vapor in the separation chamber, and water evaporated in the separation chamber is condensed for re-evaporation by means of at least one cooling surface arranged in the separation chamber.

[0011] The proposed approach overcomes the disadvantages of the prior art by providing a steam generation unit with a simple and cost-effective design, which is arranged in or within the separation chamber and also includes a condensation function. This allows the steam condenser upstream of the vacuum pump to be significantly smaller or, if an inexpensive water ring pump is used, even eliminated entirely. Furthermore, the investment required for the system hardware, as well as the on-site assembly and piping costs, are significantly reduced. The overall energy requirement for operating the CO2 separation device is also significantly lower, since the condensation energy can easily be used as evaporation energy for the CO2 release process, for example, using a heat exchanger.

[0012] In addition, the modularity of the overall system can be further simplified.

[0013] The CO2 separation device is designed to separate CO2 from a supplied air stream using a CO2 separation process. Within the scope of the present invention, the term "separation" encompasses any reasonable method of separating or capturing CO2 (carbon dioxide) from the air, whereby CO2 molecules bind and / or adhere and / or are stored and / or absorbed by a CO2 separation agent.

[0014] In this case, the CO2 separation device can be designed, in particular, to separate the CO2 from the supplied air stream using a CO2 separation process, in which the separation occurs with the release of energy or heat to the air stream. The CO2 separation process is preferably a sorption process, in particular an adsorption process and / or an absorption process. Accordingly, the CO2 separation can be carried out, in particular, using at least one of the following processes or combinations thereof: - chemical adsorption process - physical adsorption process - chemical absorption process - physical absorption process

[0015] The CO2 separation device is further configured to release CO2 from the CO2 separation medium using a CO2 release process. Within the context of the present invention, the term "release" encompasses any reasonable method of releasing or expelling CO2 (carbon dioxide) from the CO2 separation medium, whereby a dissolution and / or release and / or discharge of CO2 molecules from the CO2 separation medium occurs.

[0016] In this case, the CO2 separation device is particularly designed to release or dissolve the CO2 from the CO2 separation agent by means of a CO2 release process in which the CO2 is released from the CO2 separation agent by introducing energy or heat into the latter.

[0017] The CO2 separation process is preferably a desorption process. Accordingly, the CO2 can be released using at least one of the following processes or combinations thereof: - chemical desorption process - physical desorption process

[0018] Preferably, the CO2 separation device is designed to perform the CO2 separation process and the CO2 release process cyclically. In this case, the CO2 separation device is particularly designed to perform the sorption process and the desorption process cyclically. The basic functionality of the CO2 separation device can be implemented, for example, analogously to the aforementioned WO 2020 / 212146 A1.

[0019] Within the scope of the present invention, the term "supply" or "supplied" primarily encompasses an actively performed or initiated, and thus technically controlled or regulated, supply of the air flow by means of a blower unit or fan unit of the CO2 separation device. However, the term "supply" or "supplied" can also encompass a passively performed or initiated supply of the air flow without departing from the scope of the present invention. Consequently, the air flow can be supplied in any desired manner, for example, naturally (as wind).

[0020] The CO2 separation agent can be arranged in the separation chamber. The CO2 separation agent is preferably solid. The CO2 separation agent can, in particular, comprise a solid (appropriately functionalized) sorbent, e.g., a solid adsorbent and / or a solid absorbent. Accordingly, the CO2 separation agent can, for example, comprise a fibrous or nonwoven solid as a carrier structure with a base material selected from the group consisting of: resins, polymers, ceramics, zeolites, silicates, organometallic compounds, organic materials such as cellulose or activated carbon, and combinations thereof. The base material can, in turn, be specifically functionalized with amines, potassium carbonate, or other components designed to chemically or physically bind CO2.

[0021] The CO2 separation agent can also be designed to be air-permeable. The CO2 separation agent can also be designed to be pourable.

[0022] An example is the CO2 adsorption / absorption on amine compounds, e.g. Lewatit VP OC 1065, in which CO2 and water initially adhere to molecules and then CO2 forms a strong bond through chemical reaction with the participation of water in order to be effective even at low CO2 concentrations.

[0023] The CO2 separation device has (at least) one separation chamber. The CO2 separation device preferably has a plurality of separation chambers arranged adjacently in series, which are in particular each separated from one another by a common partition wall. The adjacent separation chambers can be operated in parallel in a CO2 separation process and a CO2 release process. In other words, if one of the separation chambers is operated in the CO2 separation process, the other separation chamber can be operated in the CO2 release process, and vice versa.

[0024] The CO2 separation device can have a valve unit with a plurality of, in particular controllable, valves to close the separation chamber for the CO2 release process. The valve unit can have an inlet valve, which is arranged in an inlet channel for the supplied or sucked-in air flow and is designed to close the inlet channel and to isolate the separation chamber upstream. The valve unit can further have an outlet valve, which is arranged in an outlet channel for the CO2-reduced air flow and is designed to close the outlet channel and to isolate the separation chamber downstream. The valve unit can also have a CO2 valve, which is arranged in a CO2 discharge channel for discharging separated CO2 and is designed to open the CO2 discharge channel in order to specifically discharge the separated / bound and released CO2 from the separation chamber.

[0025] The CO2 separation device comprises a water vapor generation unit for providing water vapor in the separation chamber for the CO2 release process.

[0026] According to the invention, the steam generation unit has at least one heating surface arranged in the separation chamber for evaporating water arranged thereon. The heating surface can be arranged within the separation chamber or can be formed as part of the separation chamber facing inward. The heating surface can therefore also be designed as a heating wall. Thus, the heating surface provides the energy for CO2 release or desorption of the CO2 and the water under negative pressure, or the heating surface is designed to provide the energy for CO2 release or desorption of the CO2 and the water under negative pressure.

[0027] It is advantageous if the heating surface is arranged below the CO2 separation medium. It is particularly advantageous if the heating surface is arranged on a chamber floor of the separation chamber, in particular, if it is formed as part of the chamber floor of the separation chamber. Accordingly, the heating surface can be designed as a heated chamber floor. This allows the CO2 separation medium located above it to be very efficiently heated for the CO2 release process using the generated rising steam – with only minimal structural effort.

[0028] Preferably, the heating surface is designed to be actively heated. For this purpose, the CO2 separation device can, for example, comprise a heating unit with heating coils and / or electrical heating elements (e.g., resistance heating elements, Peltier elements, etc.).

[0029] It is also advantageous if the heating surface is designed in such a way that the water arranged on it is distributed over a large area. This can be achieved in particular by the heating surface being inclined or at least having an incline and / or being structured or having a structuring so that the largest possible surface area for the water to evaporate is achieved. In this case, the structuring can be achieved using ribs or fins, for example, whereby superheating of the water vapor can also be achieved via the part of the heating surface that protrudes from the wetted surface. Superheating can also be achieved after the water has completely evaporated using a separate heating unit.

[0030] According to the invention, the steam generation unit has at least one cooling surface arranged in the separation chamber for condensing water evaporated in the separation chamber for further or subsequent evaporation. The cooling surface can be arranged within the separation chamber or formed as a part of the separation chamber facing inward. The cooling surface can therefore also be designed as a cooling wall.

[0031] It is advantageous if the cooling surface is arranged above the CO2 separation means and / or to the side of the CO2 separation means. In this case, it is particularly advantageous if the cooling surface is arranged on a chamber side wall and / or a chamber ceiling of the separation chamber, in particular is formed as part of the chamber side wall and / or the chamber ceiling of the separation chamber. Accordingly, the cooling surface can be designed as a cooled chamber side wall and / or cooled chamber ceiling. Alternatively or additionally, the cooling surface can also be arranged in the CO2 discharge channel for discharging the separated CO2 from the separation chamber, in particular be formed as part of a channel wall of the CO2 discharge channel. Accordingly, the cooling surface can be designed as a cooled CO2 discharge channel wall.This allows - with only minimal structural effort - the part of the water vapor not condensed on the CO2 separation agent as well as desorbed water to be cooled very efficiently on the way to the vacuum pump and condensed for re-evaporation.

[0032] Preferably, the cooling surface is designed to be actively cooled. For this purpose, the CO2 separation device can, for example, comprise a cooling unit with cooling coils.

[0033] Furthermore, it is advantageous if the heating surface and the cooling surface are designed and arranged relative to one another in such a way that water condensed on the cooling surface collects, in particular over a large area, on the heating surface due to gravity for re-evaporation. In other words, the water condensed on the cooling surface flows off the cooling surface, in particular the cooled chamber side wall, under gravity and collects on the heating surface, in particular the heated chamber floor.

[0034] It is also advantageous if the heating surface and the cooling surface can be thermally coupled, particularly by means of a heat pump and / or a heat pipe system. This measure allows the condensation heat or condensation energy to be transferred, for example, to a cooling medium, where it can then advantageously be used for the evaporation of the water, i.e., as CO2 desorption energy.

[0035] Furthermore, it is advantageous if a receiving unit for the CO2 separation agent is arranged in the separation chamber, which is thermally decoupled from the heating surface and / or the cooling surface. The CO2 separation agent can, of course, be arranged in the receiving unit of the separation chamber. Preferably, the heating surface and / or the cooling surface is / are arranged at a distance from the receiving unit, in particular from the CO2 separation agent in the receiving unit.

[0036] Thus, the CO2 separation medium is preferably arranged such that water evaporating on the heated chamber floor must first flow through it, with the water vapor preferably being guided through the CO2 separation medium from the channel outlet side. The water vapor then passes through the CO2 separation medium, heating the CO2 separation medium and largely condensing, before exiting it again at the channel inlet side. The remaining water vapor is then guided over or along a nearby cooled chamber wall in such a way that the cooling surface is optimally utilized.

[0037] The CO2 separation device may further comprise at least one of the following units: - Blower unit, in particular with a plurality of fans for supplying the air flow; - Pump unit or vacuum pump for providing overpressure and / or negative pressure for the CO2 release process or desorption process; - electric heating unit for additional heating of the separation agent for the CO2 release process or desorption process; - Sensor unit for the separation and release process; - Control unit for controlling and / or regulating the separation and release process.

[0038] The control unit can be designed to be connected to other control units and / or a central control unit of the CO2 separation device or a higher-level system by means of radio transmission such as Wi-Fi, Bluetooth, near-field communication, etc.

[0039] The CO2 separation device is preferably designed to be stationary. In particular, the CO2 separation device can be part of a building's air conditioning system, particularly integrated into an air conditioning system within a building. The separation chamber of the CO2 separation device can be integrated into the building's air conditioning circuit.

[0040] According to the invention, water arranged on the separation chamber is evaporated by means of a heating surface arranged therein in order to provide the water vapor in the separation chamber, and water evaporated in the separation chamber is condensed for re-evaporation by means of at least one cooling surface arranged in the separation chamber.

[0041] This can result in the following process flow, for example: 1) Introduction of a quantity of water which is suitable to fill the chamber volume as water vapor, if no quantity of water is stored or present, e.g. at the chamber bottom from the condensation of the previous process cycle. 2) Heat the water via the heating surface, which is preferably heated by a heating medium (the CO2 capture agent is still cold). At this point, the capture chamber is sealed against ambient air, the water is evaporated (displacing air and residual oxygen so that no degradation of the CO2 capture agent occurs during heating), and the residual air is blown off with steam at atmospheric pressure upstream of the vacuum pump. 3) Create a vacuum, pump out the air (oxygen). The water continues to evaporate via the heating surface, but the heat input prevents cooling. (Steps 2 and 3 can optionally be interchanged.) 4) Continuous CO2 release or desorption, whereby the heating surface provides the energy for the desorption of CO2 and water at negative pressure. 5) Condensation of the water vapor not condensed on the CO2 separation agent and the desorbed water on the way to the vacuum pump by means of the cooling surface, whereby the condensation heat is transferred to a cooling medium of the cooling surface to be reused for desorption. Drawings

[0042] The invention is explained in more detail below with reference to the accompanying drawings. They show: Fig. 1 shows a basic structure of a CO2 separation device according to the prior art; Fig. 2 a schematic representation of a CO2 separation device according to the invention; and Fig. 3 a sectional view AA of the CO2 separation device from Fig. 2.

[0043] In the following description of the prior art and preferred embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and having a similar effect, whereby a repeated description of the elements is omitted.

[0044] Fig. Figure 1 shows a basic structure of a CO2 separation device 100 according to the prior art. The CO2 separation device 100 is designed to separate CO2 (carbon dioxide) from an air stream 104 supplied by a blower unit 102 using a cyclic adsorption-desorption process.

[0045] For this purpose, the CO2 separation device 100 has a separation chamber 106 for accommodating a CO2 separation agent 107 or sorbent 107. The separation chamber 106 has an inlet valve 108 on an inlet channel 110 for the sucked-in air stream 104, which is designed to close the inlet channel 110 and to isolate the separation chamber 106 upstream. The separation chamber 106 further has an outlet valve 112 on an outlet channel 114 for the CO2-reduced air stream 104', which is designed to close the outlet channel 114 and to isolate the separation chamber 106 downstream. The separation chamber 106 also has a CO2 valve 116 which is arranged in a CO2 discharge channel 118 and is designed to open the CO2 discharge channel 118 in order to discharge adsorbed, ie bound / filtered and desorbed, ie released, CO2 and vaporous water from the separation chamber 106.

[0046] The separated CO2 and vaporous water are pumped out of the separation chamber 106 by means of a pump unit 120 or vacuum pump 120, wherein a water vapor condenser 122 arranged outside the separation chamber 106 is connected upstream of the vacuum pump 120.

[0047] The CO2 separation device 100 also has a heating unit 124 for additional heating of the sorbent 107 and a water vapor generation unit 126 arranged outside the separation chamber 106 for providing water vapor for the CO2 release process or desorption process.

[0048] In Fig. 2 and Fig. 3 shows a CO2 separation device 10 according to the invention schematically and in a sectional view AA. The CO2 separation device 10 is basically analogous to the CO2 separation device 100 according to Fig. 1 installed and operational.

[0049] However, the CO2 separation device 10 has, in contrast to the CO2 separation device 100 of Fig. 1 a steam generation unit 12 for providing steam 14, which is arranged in or within a separation chamber 15. The steam generation unit 12 has a heating surface 16 arranged in the separation chamber 15 for evaporating water 18 arranged thereon and a cooling surface 20 arranged in the separation chamber 15 for condensing water 14' evaporated in the separation chamber 15 for re-evaporation. Since the steam generation unit 12 also includes a condensation function, the steam condenser 122 is Fig. 1 will be omitted. The heating surface 16 is arranged below the sorbent 107 and is formed as part of a heated chamber floor 22 of the separation chamber 15.

[0050] The cooling surface 20 is arranged laterally of the sorbent 107 and is formed as part of a cooled chamber side wall 24. The cooling surface 20 is simultaneously formed as part of a channel wall 26 of the CO2 discharge channel 118 for discharging the separated CO2 from the separation chamber 15.

[0051] The heating surface 16 or the heated chamber floor 22 and the cooling surface 20 or the cooled chamber side wall 24 are arranged at a distance from the sorption agent 107, which is accommodated in a receiving unit 28 that is thermally decoupled from the heating surface 16 and the cooling surface 22.

[0052] The heating surface 16 and the cooling surface 20 are further designed and arranged relative to one another in such a way that water 18' condensed on the cooling surface 20 collects on the heating surface 16 due to gravity for re-evaporation.

[0053] The heating surface 16 is actively heated via heating coils 30, and the cooling surface 20 is actively cooled via cooling coils 32. The heating surface 16 and the cooling surface 20 are thermally coupled to one another by means of a heat pump 34, so that the condensation heat or condensation energy obtained at the cooling surface 20 can advantageously be used for the evaporation of the water 18, i.e., as CO2 desorption energy.

[0054] If an embodiment includes an “and / or” link between a first feature and a second feature, this should be read as meaning that the embodiment according to one embodiment includes both the first feature and the second feature and according to another embodiment includes either only the first feature or only the second feature. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2020 / 212146 A1 [0006, 0018] WO 2021 / 239747 A1

[0007]

Claims

[1] CO2 separation device (10) for separating CO2 from a supplied air stream (104) by means of a CO2 release process, comprising a separation chamber (15) for receiving a CO2 separation agent (107) and a water vapor generation unit (12) for providing water vapor (14) in the separation chamber (15) for the CO2 release process, characterized by that the steam generation unit (12) for providing the steam (14) has at least one heating surface (16) arranged in the separation chamber (15) for evaporating water (18) arranged thereon and at least one cooling surface (20) arranged in the separation chamber (15) for condensing water (14') evaporated in the separation chamber (15) for re-evaporation. [2] CO2 separation device (10) according to claim 1, characterized by that the heating surface (16) is arranged below the CO2 separation means (107). [3] CO2 separation device (10) according to claim 1 or 2, characterized by that the heating surface (16) is arranged on a chamber floor (22) of the separation chamber (15), in particular is formed as part of the chamber floor (22) of the separation chamber (15). [4] CO2 separation device (10) according to one of the preceding claims, characterized by that the heating surface (16) is designed in such a way, in particular inclined and / or structured, that a flat distribution of the water (18) arranged on it takes place. [5] CO2 separation device (10) according to one of the preceding claims, characterized by that the cooling surface (20) is arranged above the CO2 separation means (107) and / or laterally of the CO2 separation means (107). [6] CO2 separation device (10) according to one of the preceding claims, characterized bythat the cooling surface (20) is arranged on a chamber side wall (24) and / or a chamber ceiling of the separation chamber (15), in particular is formed as part of the chamber side wall (24) and / or the chamber ceiling of the separation chamber (15). [7] CO2 separation device (10) according to one of the preceding claims, characterized by that the cooling surface (20) is arranged in a CO2 discharge channel (118) for discharging the separated CO2 from the separation chamber (15), in particular is formed as part of a channel wall (26) of the CO2 discharge channel (118). [8] CO2 separation device (10) according to one of the preceding claims, characterized by that the heating surface (16) and the cooling surface (20) are designed and arranged relative to one another in such a way that water (18') condensed on the cooling surface (20) collects, in particular over a large area, on the heating surface (16) due to gravity for re-evaporation. [9] CO2 separation device (10) according to one of the preceding claims, characterized by that the heating surface (16) is / are actively heatable and / or the cooling surface (20) is / are actively coolable. [10] CO2 separation device (10) according to one of the preceding claims, characterized by that the heating surface (16) and the cooling surface (20) can be or are coupled to one another thermally, in particular by means of a heat pump (34) and / or a heat pipe system. [11] CO2 separation device (10) according to one of the preceding claims, characterized by that a receiving unit (28) for the CO2 separation agent (107) is arranged in the separation chamber (15), which is thermally decoupled from the heating surface (16) and / or the cooling surface (20). [12] CO2 separation device (10) according to one of the preceding claims, characterized bythat the CO2 separation means (107) is arranged in the separation chamber (15), in particular in the receiving unit (28) of the separation chamber (15). [13] CO2 separation device (10) according to claim 11 or 12, characterized by that the heating surface (16) and / or the cooling surface (20) is / are arranged at a distance from the receiving unit (28), in particular from the CO2 separation means (107) in the receiving unit (28). [14] Method (100) for separating CO2 from a supplied air stream (104) by means of a CO2 separation device (10) with a separation chamber (15; 106) for receiving a CO2 separation agent (107) and a water vapor generation unit (12) for providing water vapor (24) in the separation chamber (15) for a CO2 release process, characterized bythat by means of a heating surface (16) arranged in the separation chamber (15), water (18) arranged on this is evaporated in order to provide the water vapor (24) in the separation chamber (15), and by means of at least one cooling surface (20) arranged in the separation chamber (15), water (14') evaporated in the separation chamber (15) is condensed for further evaporation.

Images