Co2 separation apparatus for separating co2 from a supplied air stream

Abstract

The invention relates to a CO2 separation apparatus for separating CO2 from a supplied air stream (104) by means of a CO2 release process, the apparatus comprising: a separation chamber (15) for holding a CO2 separation agent (107); and a steam generation unit (12) for providing steam in the separation chamber (15) for the CO2 release process, wherein, in order to provide the steam, the steam generation unit (12) comprises: at least one heating surface (16), located in the separation chamber (15), for evaporating water located on the heating surface; and at least one cooling surface (20), located in the separation chamber (15), for condensing water evaporated in the separation chamber (15) so that it can be evaporated again.

Description

Title CO2 separation apparatus for separating CO2 from a supplied air stream Prior art The invention relates to a CO2 separation apparatus for separating CO2 (carbon dioxide) from a supplied air stream by means of a CO2 release process, comprising a separation chamber for holding a CO2 separation agent and a steam generation unit for providing steam in the separation chamber for the CO2 release process. The invention further relates to a process for separating CO2 from a supplied air stream by means of a CO2 separation apparatus, comprising a separation chamber for holding a CO2 separation agent and a steam generation unit for providing steam in the separation chamber for a CO2 release process. To limit global warming, so-called DAC (Direct Air Capture) systems are used to separate and / or remove CO2 (carbon dioxide) from the air. Since the binding of CO2 and, if applicable, water to an adsorbent material is dependent on temperature, pressure, concentration, humidity, etc., all adsorption and desorption systems cyclically change these conditions in order to separate CO2 through the resulting hysteresis. To set the desorption conditions, the adsorbent material must be temporarily isolated from the environment and is thus located in a chamber. The chamber here is usually subjected to the following steps in a cyclical manner: (1) adsorption of ambient air with the chamber open; (2) closing the chamber and heating the adsorbent material and, inevitably, also the metal chamber structure; (3) desorption of the CO2 and the bonded water by applying heat at reduced pressure (e.g., 200 to 400 mbar) and pumping out the CO2 and the vaporized water using a vacuum pump; (4) cooling the adsorbent material and the chamber, and optionally drying the adsorbent material to lower than a critical temperature, below which contact with ambient air no longer leads to increased degradation of the adsorbent material due to 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. Even cold dry air contains more water molecules than CO2 molecules, so water is always adsorbed as well. During vacuum desorption, about 3 molecules of water are released as steam for every molecule of CO2 gas. This means that 3 out of 4 parts by volume are steam. WO 2020 / 212146 A1 discloses a DAC (Direct Air Capture) system with a container solution, wherein six separation chambers arranged in series and capable of operating in parallel are provided inside the container. WO 2021 / 239747 A1 discloses a process for adsorption and desorption of a sorbent used during cyclic adsorption-desorption to capture CO2 directly from atmospheric ambient air or from highly diluted sources. After the adsorption chamber is closed, steam is injected to displace residual oxygen, which would cause the adsorbent material to degrade at elevated temperatures. Furthermore, the steam is used to directly heat the adsorbent material and provide the energy required for desorption. And ultimately, the steam is used as an inert gas to pump the CO2 out of the chamber. Since heat transfer through the air-permeable adsorbent material is poor under vacuum, heating energy in the form of superheated steam is provided outside the chamber, and the vaporized water is condensed upstream of the vacuum pump. Since both the heating and cooling systems are located outside the CO2 adsorption / desorption chamber, this results in the following disadvantages, which lead to unnecessarily high demand in terms of investment and energy: - Since, at desorption temperatures from 80 °C to 120 °C under vacuum, the desorbed water is always present in the form of steam, cooling in technical systems must also be performed upstream of the vacuum pump to relieve the vacuum pump by condensing the water beforehand, i.e., before reaching the vacuum pump. An economical design of a vacuum pump is the water ring pump, which, however, can only achieve a low ultimate pressure, due to the saturated steam pressure, when the temperature inside the pump is kept as low as possible. Typical pump temperatures range between 5 °C and 20 °C; - Cooling is performed according to the prior art by means of a condenser located outside the chamber. The CO2 to be pumped out is passed through a cold trap after leaving the chamber in order to precipitate as much desorbed water as possible before reaching the vacuum pump. As a result, the cross-section of the line must now be designed for 1 mol of CO2 + 3 mol of water, rather than just 1 mol of CO2, meaning it must be significantly larger; - In large-scale systems, a vacuum-resistant steam condenser for water, which is cooled using cooling water or cold water, is installed upstream of the vacuum pump. Like the chamber itself, the condenser is made of corrosion-resistant material, for example of expensive special stainless steel such as nickel-based steel. The enthalpy of condensation must still be kept up to desorb the water, but it is generally “disposed of” via the cooling water, since the desired low cooling water temperatures make it uneconomical to utilize the residual energy; - The technical goal is to achieve the lowest possible cooling temperatures in order to precipitate as much desorbed water as possible at the lowest possible dew point right at the start of the CO2 process chain, thereby minimizing the effort required for conditioning in subsequent process steps. Furthermore, since CO2 leads to low pH levels in humid environments (acidic condensate), significant dehumidification is desired in order to be able to use at least standard stainless steels (typically: precipitating the water to a pressure level of at least 18 bar at 25 °C = first compactor stage). Compaction, filling, transport, or further processing generally require a low water content in the order of 210 ppm residual water in the CO2. Disclosure of the invention The subject matter of the present invention is a CO2 separation apparatus according to independent claim 1, wherein the steam generation unit for providing the steam comprises at least one heating surface, located in the separation chamber, for evaporating water located thereon, and at least one cooling surface, located in the separation chamber, for condensing water evaporated in the separation chamber so that it can be evaporated again Furthermore, the subject matter of the present invention is a process according to independent claim 12, wherein by means of a heating surface located in the separation chamber, water located thereon is evaporated in order to provide the steam in the separation chamber, and by means of at least one cooling surface located in the separation chamber, water evaporated in the separation chamber is condensed so that it can be evaporated again The approach proposed herein eliminates the disadvantages of the prior art by providing a steam generation unit with a simple and cost-effective design, which is located in or within the separation chamber and further has a condensation function. This allows the steam condenser upstream of the vacuum pump to be dimensioned significantly smaller, or even omitted entirely when using an inexpensive water ring pump. Furthermore, the investment required for the system hardware as well as the effort for on-site installation and piping are significantly reduced. In addition, the total energy required to operate the CO2 separation apparatus is significantly lower, since the condensation energy can simply be used as evaporation energy for the CO2 release process, for example via a heat exchanger. Moreover, the modularity of the overall system may be further simplified. The CO2 separation apparatus is designed to separate CO2 from a supplied air stream using a CO2 separation process. In the context of the present invention, the term “separation” encompasses any sensible way of separating or removing CO2 (carbon dioxide) from the air, wherein CO2 molecules are bonded and / or adhered and / or stored and / or held by a CO2 separation agent. The CO2 separation apparatus may be designed, in particular, to separate the CO2 from the supplied air stream by a CO2 separation process in which the separation takes place with the release of energy or release of heat to the air stream. The CO2 separation process is preferably a sorption process, specifically an adsorption process and / or an absorption process. Accordingly, CO2 may be separated, in particular, using at least one of the following processes or mixed forms thereof: - chemical adsorption process - physical adsorption process - chemical absorption process - physical absorption process The CO2 separation apparatus is further configured to release CO2 from the CO2 separation agent by a CO2 release process. In the context of the present invention, the term “release” encompasses any sensible way of releasing or expelling CO2 (carbon dioxide) from the CO2 separation agent, wherein CO2 molecules are dissolved and / or released and / or discharged from the CO2 separation agent. The CO2 separation apparatus is specifically designed to release or extract the CO2 from the CO2 separation agent using a CO2 release process in which the CO2 is released from the CO2 separation agent by introducing energy and / or introducing heat into it. The CO2 separation process is preferably a desorption process. Accordingly, the release of CO2 may be performed, in particular, using at least one of the following processes or mixed forms thereof: - chemical desorption process - physical desorption process Preferably, the CO2 separation apparatus is configured to perform the CO2 separation process and the CO2 release process cyclically. The CO2 separation apparatus is specifically designed to perform the sorption process and the desorption processes cyclically. The basic operating principle of the CO2 separation apparatus may be analogous, for example, to that of WO 2020 / 212146 A1 as mentioned initially. In the context of the present invention, the term “supply” or “supplied” primarily refers to an actively performed or initiated, and thus technically controlled or regulated, supply of the air stream by means of a blower unit or fan unit of the CO2 separation apparatus. However, the term “supply” or “supplied” may also refer to a passively performed or initiated supply of the air stream without departing from the scope of the present invention. Consequently, the air stream may be supplied in any way, for example, in natural fashion (as wind). The CO2 separation agent may be located in the separation chamber. The CO2 separation agent is preferably present in solid form. The CO2 separation agent may, in particular, comprise a solid (appropriately functionalized) sorbent, such as a solid adsorbent and / or a solid absorbent. Accordingly, the CO2 separation agent may, for example, include 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 may, in turn, be specifically functionalized with amines, potassium carbonate or other components designed to chemically or physically bind CO2. The CO2 separation agent may further be designed to be permeable to air. The CO2 separation may also be designed to be free-flowing. One example is CO2 adsorption / absorption with amine compounds, such as Lewatit VP OC 1065, in which CO2 and water initially adhere to molecules and then CO2 forms a strong bond through a chemical reaction involving the water, guaranteeing effectiveness even at low CO2 concentrations. The CO2 separation apparatus includes (at least) one separation chamber. The CO2 separation apparatus preferably includes multiple separation chambers arranged in series adjacent to one another, wherein all of them are separated from one another in particular by a common separation wall. The adjacently arranged separation chambers may be operated in parallel in a CO2 separation process and a CO2 release process. In other words, this means that if one of the separation chambers is operational or operated in the CO2 separation process, the other separation chamber is operational or operated in the CO2 release process, and vice versa. The CO2 separation apparatus may include a valve unit having a plurality of valves, particularly controllable valves, to close the separation chamber for the CO2 release process. The valve unit may include an inlet valve that is arranged in an inlet channel for the supplied or drawn-in air stream and configured to close the inlet channel and isolate the separation chamber upstream. The valve unit may further include an outlet valve that is arranged in an outlet channel for the CO2-reduced air stream and configured to close the outlet channel and isolate the separation chamber downstream. The valve unit may also include a CO2 valve that is arranged in a CO2 discharge channel for discharging separations and configured to open the CO2 discharge channel in order to discharge the separated / bonded and re-released CO2 from the separation chamber in a targeted manner. The CO2 separation apparatus includes a steam generation unit for providing steam in the separation chamber for the CO2 release process. According to the invention, the steam generation unit includes at least one heating surface arranged in the separation chamber for evaporating water located thereon. The heating surface may be located within the separation chamber or may be formed as part of the separation chamber that faces inward. The heating surface may therefore also be formed as a heating wall. Thus, the heating surface provides the energy required for CO2 release or desorption of CO2 and water under vacuum, or the heating surface is designed to provide the energy required for CO2 release or desorption of CO2 and water under vacuum. It is advantageous for the heating surface to be located below the CO2 separation agent. It is particularly advantageous for the heating surface to be arranged at a chamber bottom of the separation chamber, in particular to be formed as part of the chamber bottom of the separation chamber. Accordingly, the heating surface may be designed as a heated chamber bottom. Using the generated rising steam, the CO2 separation agent located thereabove may be heated for the CO2 release process very efficiently, with minimal structural modifications. Preferably, the heating surface is designed to be actively heated. For this purpose, the CO2 separation apparatus may, for example, include a heating unit with heating coils and / or electric heating elements (such as resistance heating elements, Peltier elements, etc.) It is further advantageous for the heating surface to be designed in such a way that the water located thereon is distributed evenly over the surface area. This may be achieved, in particular, by having the heating surface inclined or at least featuring a slope and / or by having the heating surface textured or featuring a textured surface in order to obtain the largest possible surface area of the water for evaporation. For example, the texture may be achieved by using ribs or fins, wherein the portion of the heating surface that protrudes from the wetted surface may also be used to overheat the steam. Overheating may further be achieved using a separate heating unit after the water has completely evaporated. According to the invention, the steam generation unit has at least one cooling surface, located in the separation chamber, for condensing water evaporated in the separation chamber so that it can be evaporated again. The cooling surface may be located within the separation chamber or may be formed as part of the separation chamber that faces inward. The cooling surface may therefore also be formed as a cooling wall. It is advantageous for the cooling surface to be located above the CO2 separation agent and / or at a side of the CO2 separation agent. It is particularly advantageous for the cooling surface to be arranged at a chamber side wall and / or a chamber ceiling of the separation chamber, in particular to be formed as part of the chamber side wall and / or the chamber ceiling of the separation chamber. Accordingly, the cooling surface may be designed as a cooled chamber side wall and / or a cooled chamber ceiling. Alternatively or in addition, the cooling surface may also be located in the CO2 discharge channel used to discharge the separated CO2 from the separation chamber, and may in particular be formed as part of a channel wall of the CO2 discharge channel. Accordingly, the cooling surface may be designed as a cooled CO2 discharge channel wall. This allows the portion of steam that has 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 so that it can be evaporated again, with minimal structural modifications. Preferably, the cooling surface is designed to be actively cooled. For this purpose, the CO2 separation apparatus may, for example, include a cooling unit with cooling coils. Furthermore, it is advantageous for the heating surface and the cooling surface to be designed and arranged relative to one another in such a way that water condensed on the cooling surface accumulates on the heating surface under the force of gravity, in particular evenly over the surface area, so that it can be evaporated again. In other words, this means that the water condensed on the cooling surface flows down from the cooling surface, in particular from the cooled chamber side wall, under the force of gravity and accumulates on the heating surface, in particular on the heated chamber bottom. It is also advantageous if the heating surface and the cooling surface can be thermally coupled or are thermally coupled to one another, in particular 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, so that it may then be advantageously used for the evaporation of the water, i.e., as CO2 desorption energy. Furthermore, it is advantageous for the separation chamber to include a holding unit for the CO2 separation agent, which is designed to be thermally decoupled from the heating surface and / or the cooling surface. It will be understood that the CO2 separation agent may be located in the holding unit of the separation chamber. Preferably, the heating surface and / or the cooling surface are arranged at a distance from the holding unit, in particular from the CO2 separation agent in the holding unit. Thus, the CO2 separation agent is preferably arranged such that water evaporating on the heated chamber bottom must first flow through it, with the steam being guided through the CO2 separation agent, preferably from the channel outlet side. The steam then passes through the CO2 separation agent, heating the CO2 separation agent and being largely condensed, and leaves again on the channel inlet side. The remaining steam is then directed over or along a nearby cooled chamber wall in such a way as to ensure efficient use of the cooling surface. The CO2 separation apparatus may further include at least one of the following units: - blower unit, in particular having a plurality of fans for supplying the air stream; - pump unit or vacuum pump for providing positive pressure 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 processes; - control unit for controlling and / or regulating the separation and release processes. The control unit may be configured to connect to other control units and / or a central control unit of the CO2 separation apparatus or a higher-level system via radio transmission such as Wi-Fi, Bluetooth, Near Field Communication, etc. The CO2 separation apparatus is preferably designed to be stationary. In particular, the CO2 separation apparatus may be part of a building HVAC system, in particular integrated into an HVAC system within a building. In this case, the separation chamber of the CO2 separation apparatus may be integrated into the building's air conditioning system. According to the invention, by means of a heating surface located in the separation chamber, water located thereon is evaporated in order to provide the steam in the separation chamber, and by means of at least one cooling surface located in the separation chamber, water evaporated in the separation chamber is condensed so that it can be evaporated again This may result in the following process flow, for example: 1) Introducing a quantity of water sufficient to fill the chamber volume as steam, unless a quantity of water is retained or present, for example, at the chamber bottom due to condensation from the previous process cycle. 2) Heating the water via the heating surface, which is preferably heated by a heating medium (CO2 separation agent is still cold). At this point at the latest, closing the separation chamber from the ambient air, evaporating the water (displacing air and residual oxygen to prevent degradation of the CO2 separation agent during heating), and blowing off the residual air with steam at normal pressure upstream of the vacuum pump. 3) Creating a vacuum, pumping out air (oxygen in the air). The water continues to evaporate via the heating surface, with the heat input preventing it from cooling down. (Steps 2 and 3 may be done in either order as desired.) 4) Continuous CO2 release or desorption, wherein the heating surface provides the energy required for the desorption of CO2 and water under vacuum. 5) Condensing the steam that has not condensed on the CO2 separation agent and the desorbed water on the way to the vacuum pump using the cooling surface, wherein the condensation heat is transferred to a cooling medium of the cooling surface to be reused for desorption. Drawings The invention is described in more detail below by way of example with reference to the accompanying drawings. In the drawings: Fig. 1           shows a basic design of a CO2 separation apparatus according to the prior art; Fig. 2          shows a schematic representation of a CO2 separation apparatus according to the invention; and Fig. 3           shows a section view A-A of the CO2 separation apparatus of Fig. 2. In the following description of the prior art and preferred exemplary embodiments of the present invention, the same or similar reference numerals are used for the elements depicted in the various figures and having similar functions, and repeated description of the elements is omitted. Fig. 1 shows a basic design of a CO2 separation apparatus 100 according to the prior art. The CO2 separation apparatus 100 is designed to separate CO2 (carbon dioxide) from an air stream 104 supplied by a blower unit 102 by means of a cyclically performable adsorption-desorption operation. For this purpose, the CO2 separation apparatus 100 includes a separation chamber 106 for holding a CO2 separation agent 107 or sorbent 107. The separation chamber 106 includes an inlet valve 108 at an inlet channel 110 for the drawn-in air stream 104, which is configured to close the inlet channel 110 and isolate the separation chamber 106 upstream. The separation chamber 106 further includes an outlet valve 112 at an outlet channel 114 for the CO2-reduced air stream 104', which is configured to close the outlet channel 114 and isolate the separation chamber 106 downstream. The separation chamber 106 also includes a CO2 valve 116 that is arranged in a CO2 discharge channel 118 and configured to open the CO2 discharge channel 118 in order to discharge adsorbed, i.e., bonded / filtered, and re-desorbed, i.e., released, CO2 and vaporized water from the separation chamber 106. The separated CO2 and vaporized water are pumped out of the separation chamber 106 by a pump unit 120 or vacuum pump 120, with a steam condenser 122, located outside the separation chamber 106, being upstream of the vacuum pump 120. The CO2 separation apparatus 100 also includes a heating unit 124 for further heating the sorbent 107, as well as a steam generation unit 126 located outside the separation chamber 106 for providing steam for the CO2 release process or desorption process. Fig. 2 and Fig. 3 show a CO2 separation apparatus 10 according to the invention, depicted schematically and in a section view A-A. The CO2 separation apparatus 10 is basically constructed and operable in the same manner as the CO2 separation apparatus 100 according to Fig. 1. However, unlike the CO2 separation apparatus 100 of Fig. 1, the CO2 separation apparatus 10 includes a steam generation unit 12 for providing steam 14, which is located in or within a separation chamber 15. For this purpose, the steam generation unit 12 includes a heating surface 16, located in the separation chamber 15, for evaporating water 18 located thereon, and a cooling surface 20, located in the separation chamber 15, for condensing water 14’ evaporated in the separation chamber 15 so that it can be evaporated again. Since the steam generation unit 12 also has a condensation function, the steam condenser 122 is omitted compared to the CO2 separation apparatus 100 of Fig. 1. The heating surface 16 is located below the sorbent 107 and is formed as part of a heated chamber bottom 22 of the separation chamber 15. The cooling surface 20 is located at a side of the sorbent 107 and is formed as part of a cooled chamber side wall 24. At the same time, the cooling surface 20 is also formed as part of a channel wall 26 of the CO2 discharge channel 118 to discharge the separated CO2 from the separation chamber 15. The heating surface 16 or the heated chamber bottom 22 and the cooling surface 20 or the cooled chamber side wall 24 are arranged at a distance from the sorbent 107, which is held in a holding unit 28 that is thermally decoupled from the heating surface 16 and the cooling surface 22. The heating surface 16 and the cooling surface 20 are further designed and arranged relative to one another such that water 18’ condensed on the cooling surface 20 accumulates on the heating surface 16 under the force of gravity evenly over the surface area so that it can be evaporated again. The heating surface 16 is designed to be actively heated via heating coils 30, and the cooling surface 20 is designed to be actively cooled via cooling coils 32. The heating surface 16 and the cooling surface 20 can be thermally coupled or are coupled to one another via a heat pump 34, so that the condensation heat or condensation energy recovered at the cooling surface 20 may be advantageously used for the evaporation of the water 18, i.e., as CO2 desorption energy. Exemplary embodiments including an “and / or” relationship between a first feature and a second feature should be interpreted to mean that the exemplary embodiment includes both the first feature and the second feature according to one embodiment, and includes either only the first feature or only the second feature according to a further embodiment.

Claims

1. A CO2 separation apparatus (10) for separating CO2 from a supplied air stream (104) by means of a CO2 release process, with a separation chamber (15) for holding a CO2 separation agent (107) and a steam generation unit (12) for providing steam (14) in the separation chamber (15) for the CO2 release process, characterized in that, in order to provide the steam (14), the steam generation unit (12) includes at least one heating surface (16), located in the separation chamber (15), for evaporating water (18) located thereon, and at least one cooling surface (20), located in the separation chamber (15), for condensing water (14‘) evaporated in the separation chamber (15) so that it can be evaporated again.

2. The CO2 separation apparatus (10) according to claim 1, characterized in that the heating surface (16) is located below the CO2 separation agent (107).

3. The CO2 separation apparatus (10) according to claim 1 or 2, characterized in that the heating surface (16) is located on a chamber bottom (22) of the separation chamber (15) and is formed, in particular, as part of the chamber bottom (22) of the separation chamber (15).

4. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the heating surface (16) is designed in such a way, in particular inclined and / or textured, that the water (18) located thereon is distributed evenly over the surface area.

5. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the cooling surface (20) is located above the CO2 separation agent (107) and / or at a side of the CO2 separation agent (107).

6. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the cooling surface (20) is arranged at a chamber side wall (24) and / or a chamber ceiling of the separation chamber (15), and is formed in particular as part of the chamber side wall (24) and / or the chamber ceiling of the separation chamber (15).

7. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the cooling surface (20) is arranged in a CO2 discharge channel (118) for discharging the separated CO2 from the separation chamber (15), and is formed in particular as part of a channel wall (26) of the CO2 discharge channel (118).

8. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the heating surface (16) and the cooling surface (20) are designed and arranged relative to one another such that water (18') condensed on the cooling surface (20) accumulates on the heating surface (16) under the force of gravity evenly over the surface area so that it can be evaporated again.

9. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the heating surface (16) is designed to be actively heated and / or the cooling surface (20) is designed to be actively cooled.

10. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the heating surface (16) and the cooling surface (20) can be thermally coupled or are thermally coupled to one another, in particular by means of a heat pump (34) and / or a heat pipe system.

11. The CO2 separation apparatus (10) according to any of the preceding claims, characterized in that a holding unit (28) for the CO2 separation agent (107) is arranged in the separation chamber (15), which is designed to be thermally decoupled from the heating surface (16) and / or the cooling surface (20).

12. The CO2 separation apparatus (10) according to any one of the preceding claims, characterized in that the CO2 separation agent (107) is located in the separation chamber (15), in particular in the holding unit (28) of the separation chamber (15).

13. The CO2 separation apparatus (10) according to claim 11 or 12, characterized in that the heating surface (16) and / or the cooling surface (20) are arranged at a distance from the holding unit (28), in particular from the CO2 separation agent (107) in the holding unit (28).

14. A process (100) for separating CO2 from a supplied air stream (104) using a CO2 separation apparatus (10) with a separation chamber (15; 106) for holding a CO2 separation agent (107) and a steam generation unit (12) for providing steam (24) in the separation chamber (15) for a CO2 release process, characterized in that, by5               means of a heating surface (16), located in the separation chamber (15), water (18)located thereon is evaporated in order to provide the steam (24) in the separation chamber (15), and by means of at least one cooling surface (20), located in the separation chamber (15), water (14‘) evaporated in the separation chamber (15) is condensed so that it can be evaporated again.10

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