Carbon dioxide capture system

Abstract

The invention provides a carbon dioxide trapping system which comprises a filter, a heat exchanger, a rotating wheel assembly, a first storage tank, a second storage tank, a cooling pipe and a power emission assembly. The rotating wheel assembly is provided with a rotating adsorption rotating wheel, a cooling gas inlet, a desorption steam inlet, a decarburized gas outlet and a carbon dioxide outlet, the adsorption rotating wheel is provided with a composite modified adsorbent made of a porous hybrid material, and the cooling gas inlet is connected with the heat exchanger; desorption steam enters the rotating wheel assembly through the desorption steam inlet to desorb and adsorb carbon dioxide on the rotating wheel, the decarburized gas outlet is connected with the power discharge assembly to discharge gas, the carbon dioxide outlet is connected with the first storage tank, the first storage tank is connected with the second storage tank, and a cooling pipe is wound on the first storage tank. The system can improve the carbon dioxide trapping efficiency by using the composite modified adsorbent.

Description

Technical Field

[0001] This invention relates to the field of carbon capture, and in particular to a carbon dioxide capture system. Background Technology

[0002] Carbon dioxide capture, utilization, and storage (CO2 capture, utilization, and storage) technology is considered one of the important ways to achieve carbon emission reduction targets. Currently, CO2 capture technologies mainly include chemical absorption, physical adsorption, membrane separation, and cryogenic condensation.

[0003] Existing technologies for carbon dioxide capture generally suffer from the following problems: High energy consumption: The capture process requires a large amount of energy, resulting in low overall energy efficiency; Large equipment footprint: Traditional capture equipment is bulky, making it unsuitable for application in space-constrained industrial sites; High equipment investment and maintenance costs: High-performance adsorbents and complex system designs increase equipment investment and maintenance costs; Complex operation: Existing capture systems require frequent operation switching, making it difficult to achieve stable operation over long periods; Environmental impact: Some capture methods may generate secondary pollution during the emission process, affecting environmental safety. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned related technologies, the purpose of the present invention is to provide a carbon dioxide capture system.

[0005] To achieve the above and other related objectives, the present invention provides a carbon dioxide capture system, comprising a filter, a heat exchanger, a rotary assembly, a first storage tank, a second storage tank, a cooling pipe, and a power emission assembly. The filter is connected to the heat exchanger, and flue gas enters the heat exchanger for cooling after being filtered by the filter. The rotary assembly is provided with a rotating adsorption rotor, a cooling gas inlet, a desorption steam inlet, a decarbonization gas outlet, and a carbon dioxide outlet. The adsorption rotor is provided with a composite modified adsorbent made of porous hybrid material. The cooling gas inlet is connected to the heat exchanger, and the cooled flue gas... Gas enters the rotary drum assembly, where carbon dioxide in the flue gas is adsorbed by the adsorption rotary drum. Desorption steam enters the rotary drum assembly through the desorption steam inlet to desorb the carbon dioxide on the adsorption rotary drum. The decarbonized gas outlet is connected to the power emission assembly to discharge the gas. The carbon dioxide outlet is connected to the first storage tank to transport the desorbed carbon dioxide to the first storage tank. The first storage tank and the second storage tank are connected, and the cooling pipe is coiled around the first storage tank. The cooling pipe is used to cool the carbon dioxide in the first storage tank to remove water vapor from the carbon dioxide. The second storage tank is used to store carbon dioxide.

[0006] Optionally, the adsorption wheel has a honeycomb-shaped micro / nanoporous structure.

[0007] Optionally, the cooling pipe is double-wound around the first storage tank, starting from the gas inlet end of the first storage tank and winding to the gas outlet end, and then winding back from the gas outlet end to the gas inlet end, or winding from the gas outlet end to the gas inlet end and then winding back from the gas inlet end to the gas outlet end.

[0008] Optionally, the composite modified adsorbent is a mixture of metal-organic framework-derived micro / nano composite materials and lithium-based adsorbents, or the composite modified adsorbent is a mixture of metal-organic framework-derived micro / nano composite materials and calcium oxide-based adsorbents.

[0009] Optionally, the mixing ratio of the metal-organic framework-derived material to the lithium-based adsorbent is 30%:70%.

[0010] Optionally, the metal-organic framework-derived material and the calcium oxide-based adsorbent are mixed in a ratio of 40% to 60%.

[0011] Optionally, the adsorption temperature is 20–100°C, and the adsorption pressure is 0–0.2 MPa.

[0012] Optionally, the desorption temperature is 100-150°C and the desorption pressure is 0-0.2 MPa.

[0013] Optionally, the rotational speed of the adsorption wheel is 1 to 5 r / h.

[0014] Optionally, the rotating wheel assembly further includes a drive unit, which includes a motor, a gearbox, and a drive gear. The outer circumferential surface of the adsorption rotating wheel is provided with a toothed ring. The output end of the motor is connected to the input end of the gearbox, and the output end of the gearbox is connected to the drive gear. The drive gear meshes with the toothed ring.

[0015] As described above, the carbon dioxide capture system of the present invention has the following beneficial effects: the adsorbent used in the present invention is a porous hybrid material, which has a large adsorption capacity, a fast adsorption rate and good cycle stability, and has lower regeneration energy consumption and simpler operation process. The carbon dioxide capture system of the present invention can improve the adsorption efficiency of carbon dioxide and help reduce costs by using this composite modified adsorbent.

[0016] This invention utilizes a carbon dioxide rotor assembly to achieve carbon dioxide adsorption and desorption within a single device, greatly reducing the footprint of the carbon dioxide capture system, saving equipment investment costs, and achieving energy-saving goals. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic of a carbon dioxide capture system in an embodiment of the present invention.

[0018] Figure 2 The diagram shown is a schematic representation of the rotary wheel assembly in an embodiment of the present invention.

[0019] Component designation explanation

[0020] 1. Filter; 101. Flue gas inlet; 102. Filter outlet; 2. Heat exchanger; 201. Filtered gas inlet; 202. Cooling gas outlet; 203. Desorption steam outlet; 204. Recovery inlet; 3. First storage tank; 301. Gas input end; 302. Gas output end; 303. Liquid output end; 4. Second storage tank; 5. Circulating water tank; 6. Cooling pipe; 7. Adsorption rotor; 701. Support shaft; 702. Adsorption zone; 703. Desorption zone; 704. Cooling zone; 705. Cooling gas inlet; 706. Desorption steam inlet; 707. Decarbonized gas outlet; 708. Carbon dioxide outlet; 8. Motor; 801. Gearbox; 802. Drive gear; 803. Gear ring; 9. Exhaust fan; 901. Decarbonized gas inlet; 10. Chimney. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0022] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0023] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0024] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0025] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0026] like Figure 1 As shown, this embodiment provides a carbon dioxide capture system. The carbon dioxide capture system includes a filter 1, a heat exchanger 2, a rotor assembly, a first storage tank 3, a second storage tank 4, a circulating water tank 5, a cooling pipe 6, and a power emission assembly.

[0027] Filter 1 is a multi-stage filter, equipped with a flue gas inlet 101 and a filter outlet 102. Filter 1 includes a primary filtration unit, a secondary filtration unit, and a tertiary filtration unit. The primary filtration unit uses electrostatic dust removal technology to remove large particles; the secondary filtration unit uses a nanofiber filter to filter fine particles; and the tertiary filtration unit uses activated carbon or zeolite materials to adsorb harmful gases and heavy metal ions. When treating flue gas, the flue gas enters filter 1 through the flue gas inlet 101, at which point filter 1 removes solid particles, harmful gases, and heavy metal impurities from the flue gas.

[0028] Heat exchanger 2 is a gas heat exchanger. Heat exchanger 2 is equipped with a filtered gas inlet 201, a cooling gas outlet 202, a desorbed steam outlet 203, and a recovery inlet 204, wherein the filtered outlet 102 is connected to the filtered gas inlet 201. The carbon dioxide-rich gas, after being filtered by filter 1, enters the heat exchanger 2 through the filtered gas inlet 201 and is cooled inside the heat exchanger 2.

[0029] In this embodiment, the heat exchange medium of the heat exchanger 2 is cooling water from the circulating water tank 5. Cooling pipes 6 are arranged around the surface of the first storage tank 3. The inlet of the cooling pipes 6 is connected to the outlet of the circulating water tank 5, and the outlet of the cooling pipes 6 is connected to the recovery inlet 204. The cooling water first passes through the cooling pipes 6 before entering the heat exchanger 2. It is understood that a water pump is provided between the outlet of the circulating water tank 5 and the recovery inlet 204 to transport the cooling water to the heat exchanger 2.

[0030] An electromagnetic switch valve is installed between the inlet of the cooling pipe 6 and the outlet of the circulating water tank 5, and another electromagnetic switch valve is installed between the outlet of the cooling pipe 6 and the recovery inlet 204. The cooling pipe 6 is spirally coiled around the outside of the first storage tank 3, with its overall coiling following the direction of water vapor flow inside the first storage tank 3, i.e., from the inlet to the outlet of the cooling pipe 6. The cooling pipe 6 is double-coiled outside the first storage tank 3, starting from the gas inlet end 301 of the first storage tank 3 and winding to the gas outlet end 302, and then winding back from the gas outlet end 302 to the gas inlet end 301, or first winding from the gas outlet end 302 to the gas inlet end 301, and then winding back from the gas inlet end 301 to the gas outlet end 302, to ensure the efficiency of steam recovery.

[0031] like Figure 1 and Figure 2 As shown, the rotating wheel assembly includes an adsorption rotating wheel 7, an adsorption fan (not shown in the attached diagram), a desorption fan (not shown in the attached diagram), and a drive unit. The adsorption rotating wheel 7 adopts a honeycomb micro-nanoporous structure and is loaded with a high-performance adsorbent (a composite modified adsorbent using porous hybrid materials) on its surface. A support shaft 701 is concentrically inserted on the adsorption rotating wheel 7. Three partitions are provided on the adsorption rotating wheel 7, which divide the adsorption rotating wheel 7 into an adsorption zone 702, a desorption zone 703, and a cooling zone 704. The drive unit drives the adsorption rotating wheel 7 to rotate. The area of ​​the adsorption zone 702 generally exceeds 3 / 4 of the total area of ​​the adsorption rotating wheel 7. The area of ​​the desorption zone 703 is equal to the area of ​​the cooling zone 704. The adsorption zone 702 has a large area and a good adsorption effect.

[0032] The rotor assembly is provided with a cooling gas inlet 705, a desorption steam inlet 706, a decarbonization gas outlet 707, and a carbon dioxide outlet 708. The cooling gas inlet 705 is connected to the cooling gas outlet 202, and the desorption steam inlet 706 is connected to the desorption steam outlet 203.

[0033] During the operation of the rotor assembly, this embodiment employs an intelligent control system, integrated sensor network, Internet of Things technology, and machine learning algorithms to achieve real-time monitoring and optimized control of the adsorption and desorption processes.

[0034] The drive unit includes a motor 8 (variable frequency motor), a gearbox 801, and a drive gear 802. A gear ring 803 is provided on the outer circumference of the adsorption wheel 7. The output end of the motor 8 is connected to the input end of the gearbox 801, and the output end of the gearbox 801 is connected to the drive gear 802. The drive gear 802 meshes with the gear ring 803. The drive unit uses the gearbox 801 for transmission, resulting in high transmission power, high efficiency, and stable operation. The gear ring 803 on the outer circumference of the adsorption wheel 7, in conjunction with the drive gear 802, ensures more precise operation and better stability. Furthermore, the support shaft 701 on the adsorption wheel 7 further enhances rotational stability. The operation of the drive unit is controlled by a digital controller.

[0035] The first storage tank 3 is equipped with a gas input end 301, a gas output end 302 and a liquid output end 303. The gas input end 301 is connected to the carbon dioxide outlet 708 of the rotor assembly, and the gas output end 302 is connected to the second storage tank 4. The gas output end 302 on the first storage tank 3 is used to transport carbon dioxide to the second storage tank 4. The second storage tank 4 is used for the storage and subsequent processing of high-purity carbon dioxide.

[0036] The inlet of the circulating water tank 5 is connected to the liquid outlet 303. The cooled water in the first storage tank 3 is discharged from the liquid outlet 303 to the circulating water tank 5 for recycling. The circulating water tank 5 is equipped with a water quality monitoring and treatment device. A water pump is also installed between the liquid outlet 303 and the circulating water tank 5, which can quickly draw water into the circulating water tank 5.

[0037] The power emission assembly includes an induced draft fan 9 and a chimney 10. The induced draft fan 9 is equipped with a decarbonized gas inlet 901, which is connected to a decarbonized gas outlet 707. The outlet of the induced draft fan 9 is connected to the inlet of the chimney 10. The induced draft fan 9 adopts an aerodynamically optimized design to reduce energy consumption and noise. The chimney 10 is equipped with exhaust gas treatment and online monitoring devices to ensure that emissions meet environmental protection standards.

[0038] The power emission components also include a waste heat recovery module, which uses organic Rankine cycle technology to convert waste heat into electrical or mechanical energy for use within the system.

[0039] During the implementation of the gas capture system, flue gas is passed through a multi-stage filter 1 to remove solid particles, harmful gases, and heavy metal impurities, resulting in clean gas rich in carbon dioxide. Heat exchange cooling: The carbon dioxide-rich gas is introduced into a heat exchanger 2 to exchange heat with the heat exchange medium, forming a cooling gas, while the heat exchange medium is heated. Intelligent adsorption decarbonization: The cooled carbon dioxide-rich gas, under the action of an adsorption fan, enters the adsorption zone 702 of the rotor assembly through the cooling gas inlet 705. Under suitable adsorption temperature and pressure, it contacts the high-performance solid adsorbent, selectively adsorbing carbon dioxide to generate decarbonized gas, which is discharged through the power emission assembly. High-efficiency desorption and recovery: The adsorbent saturated with adsorption enters the desorption zone 703 along with the rotor. The heated heat exchange medium is then introduced into the desorption zone 703. Under suitable desorption temperature and pressure, efficient desorption of carbon dioxide is achieved. The desorbed high-purity carbon dioxide then enters the first storage tank 3 (the desorbed high-purity carbon dioxide enters the first storage tank 3 through a desorption fan); Adsorbent cooling and regeneration: After being cooled in the cooling zone 704, the adsorbent re-enters the adsorption zone 702 for recycling. The cooling process can adopt a combination of circulating water and air cooling to improve cooling efficiency; Carbon dioxide purification and storage: The carbon dioxide in the first storage tank 3 is cooled through the cooling pipe 6 and then enters the second storage tank 4 for storage. The cooling water is recycled, and the water quality monitoring and treatment device ensures the stable operation of the water circulation system; Energy recovery and resource utilization: The waste heat recovery module converts the waste heat from the heat exchanger 2 and the desorption process into electrical energy through the ORC system, which is used by the internal equipment of the system to reduce overall energy consumption.

[0040] The rotary assembly occupies a small area, thus greatly increasing the space utilization rate of the carbon dioxide capture system and saving equipment investment costs. The flue gas temperature is 200-350℃. The heat exchange medium is heated by the heat of the flue gas itself to obtain steam for desorption, improving the thermal energy utilization rate. The carbon dioxide formed after desorption by the rotary assembly has a temperature of 100-110℃ and contains a small amount of steam. Therefore, after the desorbed carbon dioxide is introduced into the first storage tank 3, the cooling pipe 6 cools the steam in the first storage tank 3. After the steam in the first storage tank is cooled into water, the carbon dioxide enters the second storage tank 4 for further capture. In this way, the purity of carbon dioxide is high. The water in the first storage tank 3 enters the circulating water tank 5 for recycling. The water in the cooling pipe 6 is introduced into the heat exchanger 2. After heat exchange and evaporation in the heat exchanger 2, it becomes desorption steam. This realizes water circulation, reduces resource waste, improves resource utilization, achieves energy-saving goals, and greatly improves the purity of carbon dioxide. After the steam in the first storage tank 3 is cooled into water, a small amount of carbon dioxide will dissolve into the water. The water with a small amount of dissolved carbon dioxide enters the circulating water tank 5, and then enters the heat exchanger 2 through the cooling pipe 6 for heat exchange and evaporation as desorption steam. In this way, when the desorption steam mixed with a small amount of carbon dioxide is used for desorption, the purity of carbon dioxide is higher, and the waste of carbon dioxide is avoided, thus improving the carbon dioxide recovery efficiency.

[0041] In some specific embodiments, the adsorption temperature is 20–100°C, preferably 75°C, and the adsorption pressure is 0–0.2 MPa, preferably 0.1 MPa. Suitable adsorption temperature and adsorption pressure can improve the adsorption effect.

[0042] In some specific embodiments, the desorption temperature is 100-150°C, preferably 110°C, and the desorption pressure is 0-0.2 MPa, preferably 0.1 MPa. Suitable desorption temperature and desorption pressure can improve desorption efficiency.

[0043] In some specific embodiments, the rotational speed of the adsorption rotor 7 is 1 to 5 r / h, preferably 3 r / h. Within this range, the laminar flow of carbon dioxide in the microchannel is more stable and controllable.

[0044] In some specific embodiments, the temperature of the heat exchange medium after heating is 100-150°C, preferably 120°C. The temperature of the heat exchange medium after heating should not be higher than 150°C to prevent damage to the solid adsorbent, avoid affecting the capture effect, and prevent carbon dioxide from reacting. If the temperature is lower than 100°C, the desorption effect will be poor.

[0045] In this embodiment, the adsorbent is selected from composite modified adsorbents of novel materials such as metal-organic frameworks, covalent organic frameworks, porous organic polymers, and functionalized graphene aerogels. For example, the adsorbent in this embodiment is a mixture of metal-organic framework-derived materials and lithium-based adsorbents, wherein the optimal mass mixing ratio is 30%:70%, or a mixture of metal-organic framework-derived materials and calcium oxide-based adsorbents, wherein the optimal mass mixing ratio is 40%:60%. This ratio can maximize the advantages of the high adsorption active sites of metal-organic framework-derived materials while ensuring adsorption stability.

[0046] In the preparation process, the pretreatment step involves ultrasonically dispersing the metal-organic framework-derived micro / nano composite material to ensure uniform dispersion in a dispersion medium (such as anhydrous ethanol) and prevent agglomeration. Simultaneously, the lithium-based and calcium oxide-based adsorbents are pulverized to achieve particle sizes similar to the metal-organic framework-derived material, facilitating subsequent homogeneous mixing. The mechanical mixing step involves using a high-speed stirrer to add the pretreated metal-organic framework-derived material dispersion and lithium-based or calcium oxide-based adsorbent powder to a stirring container in a predetermined ratio. Stirring is performed at high speed (1000-1500 rpm) for 30-60 minutes to ensure thorough mixing. After stirring, the dispersion medium is removed by centrifugation or vacuum distillation to obtain a uniformly mixed adsorbent. The molding process involves pressing or granulating the mixed adsorbent to achieve a suitable shape and size for easy loading into the adsorption rotor 7. For example, forming the adsorbent into spherical particles with a diameter of 3-5 mm ensures sufficient mechanical strength while increasing the contact area between the gas and the adsorbent.

[0047] Compared to traditional adsorbents, the adsorbent in this embodiment improves adsorption performance. Using a mixed adsorbent, the adsorption capacity for carbon dioxide is increased by 30%-50% within the same adsorption time compared to single lithium-based or calcium oxide-based adsorbents. For example, a single lithium-based adsorbent might adsorb 10 mg / g of carbon dioxide in one hour, while using the mixed adsorbent, this can increase to 13-15 mg / g in one hour. The adsorption rate is also significantly improved. Based on previous experimental data and theoretical analysis, the time for the mixed adsorbent to reach adsorption equilibrium is shortened by 20%-30%. This means that in actual operation, the carbon dioxide capture system can reach a stable working state more quickly, improving efficiency. Furthermore, because it retains the main components of lithium-based and calcium oxide-based adsorbents, the mixed adsorbent maintains good stability under different temperature, humidity, and other operating conditions. Under high temperature (80-120℃) and high humidity (60%-80% relative humidity) conditions, after more than 100 adsorption-desorption cycle tests, the adsorption performance of the mixed adsorbent is controlled to within 10%, ensuring the long-term stable operation of the carbon dioxide capture system.

[0048] The capture system of this embodiment was used to conduct a capture test on a certain flue gas to be treated, and its capture effect on carbon dioxide in the flue gas was calculated. The material balance results are shown in Table 1.

[0049] Table 1

[0050]

[0051] Comparative Example

[0052] A capture test was conducted on the same flue gas to be treated in the embodiment to determine the capture effect of a membrane separation carbon dioxide capture device on carbon dioxide in flue gas. The material balance results are shown in Table 2.

[0053] Table 2

[0054]

[0055] Meanwhile, a techno-economic analysis was conducted on the embodiments and comparative examples, and the results are shown in Table 3.

[0056] Table 3

[0057]

[0058]

[0059] In summary, the capture system using the adsorbent in this embodiment not only has strong adsorption capacity and can capture more carbon dioxide, but also has lower cost.

[0060] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A carbon dioxide capture system, characterized in that: The system includes a filter, a heat exchanger, a rotor assembly, a first storage tank, a second storage tank, a cooling pipe, and a power emission assembly. The filter is connected to the heat exchanger, and flue gas enters the heat exchanger for cooling after being filtered by the filter. The rotor assembly is equipped with a rotating adsorption rotor, a cooling gas inlet, a desorption steam inlet, a decarbonized gas outlet, and a carbon dioxide outlet. The adsorption rotor is equipped with a composite modified adsorbent made of porous hybrid material. The cooling gas inlet is connected to the heat exchanger, and the cooled flue gas enters the rotor assembly. The adsorption rotor adsorbs carbon dioxide from the flue gas. Desorption steam enters the rotor assembly through the desorption steam inlet to desorb the carbon dioxide on the adsorption rotor. The decarbonized gas outlet is connected to the power emission assembly to discharge gas. The carbon dioxide outlet is connected to the first storage tank to transport the desorbed carbon dioxide to the first storage tank. The first and second storage tanks are connected, and the cooling pipe is coiled around the first storage tank. The cooling pipe is used to cool the carbon dioxide in the first storage tank to remove water vapor from the carbon dioxide. The second storage tank is used to store carbon dioxide.

2. The carbon dioxide capture system according to claim 1, characterized in that: The adsorption wheel has a honeycomb-shaped micro / nanoporous structure.

3. The carbon dioxide capture system according to claim 1, characterized in that: The cooling pipe is double-coiled around the outside of the first storage tank, starting from the gas inlet end of the first storage tank and winding to the gas outlet end, and then winding back from the gas outlet end to the gas inlet end, or winding back from the gas outlet end to the gas inlet end and then winding back from the gas inlet end to the gas outlet end.

4. The carbon dioxide capture system according to claim 1, characterized in that, include: The composite modified adsorbent is a mixture of metal-organic framework-derived micro / nano composite materials and lithium-based adsorbents, or the composite modified adsorbent is a mixture of metal-organic framework-derived micro / nano composite materials and calcium oxide-based adsorbents.

5. The carbon dioxide capture system according to claim 4, characterized in that: The mixing ratio of the metal-organic framework-derived material to the lithium-based adsorbent is 30%:70%.

6. The carbon dioxide capture system according to claim 4, characterized in that: The metal-organic framework-derived material and the calcium oxide-based adsorbent are mixed in a ratio of 40% to 60%.

7. The carbon dioxide capture system according to claim 1, characterized in that: The adsorption temperature is 20–100℃, and the adsorption pressure is 0–0.2 MPa.

8. The carbon dioxide capture system according to claim 1, characterized in that: The desorption temperature is 100–150°C, and the desorption pressure is 0–0.2 MPa.

9. The carbon dioxide capture system according to claim 1, characterized in that: The rotational speed of the adsorption wheel is 1 to 5 r / h.

10. The carbon dioxide capture system according to claim 1, characterized in that: The rotating wheel assembly also includes a drive unit, which includes a motor, a gearbox, and a drive gear. The outer circumferential surface of the adsorption rotating wheel is provided with a toothed ring. The output end of the motor is connected to the input end of the gearbox, and the output end of the gearbox is connected to the drive gear. The drive gear meshes with the toothed ring.

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