Equipment and process for producing hydrogen and synthesizing methanol by solar energy
By using a symmetrical modular dual-reactor structure and a trough-type concentrator optimized with secondary reflectors, CO2 was efficiently captured and converted to produce economically valuable methanol, thus solving the problems of high energy consumption and mismatched conversion rates in direct air capture technology.
Patent Information
- Application Number
- CN202511369582.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2025-12-19
AI Technical Summary
Existing direct air capture technology is energy-intensive and cannot produce economically valuable products. High-concentration CO2 feedstock or CO2 utilization technology under high-temperature conditions is difficult to integrate efficiently with direct air capture technology, and the CO2 capture and conversion rates are mismatched.
It adopts a symmetrical, modular dual-reactor structure, and realizes the alternation of day and night roles through a rotating mechanism. Combined with a secondary reflector to optimize the trough concentrator, it ensures efficient utilization of solar thermal energy and directional continuous flow of reactants. It utilizes catalytic composite materials to achieve efficient capture, desorption and conversion of CO2 in the flow reactor.
It achieves efficient CO2 capture and conversion, solves the problem of mismatch between capture and conversion rates, improves system efficiency and reliability, and generates economically valuable methanol products.
Smart Images
Figure CN121155489A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of carbon capture and utilization technology, specifically a device and process for solar-powered hydrogen production to synthesize methanol. Background Technology
[0002] Direct air capture (DAC) of carbon dioxide is a potential technology for actively removing CO2 from the atmosphere and addressing the climate crisis. Although the technology has made progress and achieved pilot-scale applications, DAC remains an energy-intensive process, resulting in high CO2 removal costs and the absence of any economically valuable byproducts. This limitation restricts its application to localized regions with access to inexpensive energy sources. Some of the most advanced DAC technologies employ a "carbon capture and storage" (CFS) model, storing captured CO2 within geological structures. However, the long-term effects of storing large amounts of CO2 underground for decades remain unclear.
[0003] Another approach is to use captured CO2 to produce renewable fuels and chemicals, creating economic value while achieving carbon neutrality and recycling. However, the problem is that most existing CO2 utilization technologies require high-concentration CO2 feedstocks or high-temperature conditions, making them difficult to integrate efficiently with direct air capture technology.
[0004] Therefore, it is necessary to provide a solar-powered hydrogen production and methanol synthesis equipment and process to solve the problems mentioned in the background art. Summary of the Invention
[0005] To achieve the above objectives, the present invention provides the following technical solution: a solar-powered hydrogen production and methanol synthesis device, comprising a base fixed to the ground, a first motor, a first reducer, and a rotary encoder disposed on one side of the base; two support plates symmetrically disposed on the base, the support plate closer to the rotary encoder being fixedly connected to the output end of the rotary encoder, and the support plate farther from the rotary encoder being rotatably connected to the base, and a multi-way valve array disposed in the middle of the support plate; flow reactors symmetrically disposed between the two support plates at both ends of the support plates; and a secondary reflector disposed on the side of each flow reactor near the middle of the support plate.
[0006] A trough-type concentrator is arranged parallel to the flow reactor on the outside of the base.
[0007] Furthermore, as a preferred embodiment, the multi-way valve array is a combined system consisting of multiple two-position three-way solenoid valves integrated into a common valve block according to fluid logic, including an air intake valve, a carrier air intake valve, a water inlet valve, a water outlet valve, and a product air guide valve.
[0008] Furthermore, as a preferred embodiment, the flow reactor includes a collection module, a utilization module, and a recovery module arranged sequentially along a straight line; an electromagnetic three-way valve is provided between the collection module and the utilization module.
[0009] Furthermore, as a preferred embodiment, the collection module includes a collection tube, one end of which has an air inlet connected to both the air inlet valve and the carrier gas inlet valve of the multi-way valve array; the other end of the collection module is connected to an electromagnetic three-way valve; and a solid adsorbent is disposed inside the collection tube.
[0010] Furthermore, as a preferred embodiment, the utilization module includes a utilization pipe, one end of which is connected to an electromagnetic three-way valve, and the other end of which is connected to a recovery module; the utilization pipe is internally provided with a catalytic composite material; a water jacket is fitted around the utilization pipe, and the water jacket has an inlet and an outlet along its outer circumferential sidewall; the inlet and outlet are respectively connected to the inlet valve and outlet valve of the multi-way valve array.
[0011] Furthermore, as a preferred embodiment, the recycling module includes a recycling pipe, one end of which has a second air outlet, and the other end of which is connected to the utilization pipe; the recycling pipe is provided with a recycling composite material; and the second air outlet is connected to the product air guide valve of the multi-way valve array.
[0012] Furthermore, as a preferred embodiment, the trough-type concentrator includes two symmetrically arranged support frames on the ground, with a rotating disk rotatably arranged on one side of each of the two support frames; a second motor, a second reducer, and a belt drive device are arranged inside one of the support frames; the rotating disk near the second motor is fixed to the output end of the belt drive device; a reflector is arranged between the two rotating disks, with both ends of the reflector fixed to the rotating disk.
[0013] Furthermore, as a preferred embodiment, the parabolic profile of the reflector is optically optimized to precisely focus sunlight onto the surface of the flow reactor.
[0014] A process for synthesizing methanol from hydrogen using solar energy, employing the equipment for synthesizing methanol from hydrogen using solar energy as described in any one of claims 1-8, includes the following steps:
[0015] Let module A and module B be the two flow reactors described above;
[0016] S1. Before the start of work, the air intake valve of the multi-way valve array introduces air into the collection tube of module A. The solid adsorbent efficiently captures CO2 in the air, and the gas without CO2 is discharged into the outside through the electromagnetic three-way valve (10).
[0017] S2. After the operation begins, the first motor drives the support plate to rotate forward via the first reducer and rotary encoder, sending module A to the designated reaction position. Module A: The carrier gas inlet valve of the multi-way valve array introduces N2 into the collection tube of module A. The trough-type concentrator and the secondary reflector work together to heat the adsorbent to 80-100℃, achieving efficient desorption of captured CO2 and forming a concentrated CO2 stream. The concentrated CO2 stream is sent into the utilization tube through the electromagnetic three-way valve, where the catalytic composite material reduces CO2 to CO and H2. At the same time, the water inlet valve of the multi-way valve array introduces water into the water jacket of module A, keeping the temperature inside the utilization tube constant. The generated CO and H2 are sent into the recovery tube, where the recovery composite material recovers the residual CO2. The treated CO and H2 are sent into the methanol preparation unit by the product gas guide valve of the multi-way valve array.
[0018] Module B: The air intake valve of the multi-way valve array introduces air into the collection tube of Module B. The solid adsorbent efficiently captures CO2 in the air, and the CO2-free gas is discharged to the outside through the electromagnetic three-way valve.
[0019] S3. After the reaction is completed, the first motor drives the support plate to rotate 180° in the opposite direction via the first reducer and the rotary encoder, sending module B to the designated reaction position; Module A: performs the operation of module B in S2 above;
[0020] Module B: The air intake valve of the multi-way valve array introduces air into the collection tube of Module B. The solid adsorbent efficiently captures CO2 in the air, and the CO2-free gas is discharged to the outside through the electromagnetic three-way valve. After the sun rises the next day, the operation of Module A in S2 above will be executed.
[0021] S4. Module A and Module B repeat the operation process of S2-S3 above.
[0022] Compared with the prior art, the beneficial effects of the present invention are:
[0023] This invention employs a symmetrical, modular dual-reactor structure. Two flow reactors with identical "capture-desorption-conversion" functions alternate roles day and night via a rotating mechanism, achieving both efficient utilization of solar thermal energy and ensuring the directional and continuous flow of reactants. The entire system functions like a "breathing" and "digesting" organism: converting CO2 during the day and capturing CO2 at night, successfully solving the problem of mismatched CO2 capture and conversion rates through a cyclical operation.
[0024] This invention employs a secondary reflector to address the problem of uneven solar flux distribution in parabolic trough concentrators, which leads to a large temperature gradient on the surface of the absorber tube, thereby reducing system efficiency and potentially causing equipment damage. The addition of a secondary reflector significantly improves the uniformity of heat flux distribution on the surface of the absorber tube. Furthermore, by optimizing the arrangement of the flow reactor, the heat flux on the upper and lower surfaces of the absorber tube is effectively balanced, thereby enhancing the photothermal performance and operational reliability of the trough concentrator. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0026] Figure 2 This is a schematic diagram of the secondary reflector in this invention;
[0027] Figure 3 This is a schematic diagram of the trough-type concentrator in the present invention;
[0028] Figure 4 This is a schematic diagram of the working process of the slotted concentrator and secondary reflector in this invention;
[0029] Figure 5 This is a schematic diagram of the flow reactor in this invention;
[0030] Figure 6 This is a diagram showing the working process of a flow reactor at different time points;
[0031] In the diagram: 1. Base; 2. First motor; 3. First reducer; 4. Rotary encoder; 5. Support plate; 6. Flow reactor; 61. Collection module; 611. Collection tube; 612. Air inlet; 613. Solid adsorbent; 62. Utilization module; 621. Utilization tube; 622. Water jacket; 623. Water inlet; 624. Water outlet; 625. Catalytic composite material; 63. Recovery module; 631. Recovery tube; 632. Second air outlet; 633. Recovery composite material; 7. Secondary reflector; 8. Multi-way valve array; 9. Trough concentrator; 91. Support frame; 92. Second motor; 93. Second reducer; 94. Belt drive device; 95. Rotary disk; 96. Reflector; 10. Three-way solenoid valve; 101. First air outlet. Detailed Implementation
[0032] Please see Figures 1-6In this embodiment of the invention, a solar-powered hydrogen production and methanol synthesis device includes a base 1 fixed to the ground. A first motor 2, a first reducer 3, and a rotary encoder 4 are arranged on one side of the base 1. Two support plates 5 are symmetrically arranged on the base 1. The support plate 5 closer to the rotary encoder 4 is fixedly connected to the output end of the rotary encoder 4, while the support plate 5 further away from the rotary encoder 4 is rotatably connected to the base 1. A multi-port valve array 8 is arranged in the middle of the support plate 5. Flow reactors 6 are symmetrically arranged between the two support plates 5 at both ends. Each flow reactor 6 has a secondary reflector 7 arranged on the side closest to the middle of the support plate 5. The first motor 2 drives the support plate 5 to rotate via the reducer 3 and the rotary encoder 4, causing the two flow reactors 6, each with the same "capture-desorption-conversion" function, to alternate roles day and night. This achieves efficient utilization of solar thermal energy and ensures the directional and continuous flow of reactants. The entire system is like a "breathing" and "digesting" organism: converting CO2 during the day and capturing CO2 at night, successfully solving the problem of mismatched CO2 capture and conversion rates through a cyclical operation mode.
[0033] A trough-type concentrator 9 is arranged parallel to the flow reactor 6 on the outside of the base 1.
[0034] In this embodiment, the multi-way valve array 8 is a combination system of multiple two-position three-way solenoid valves integrated on a common valve block according to fluid logic. It includes an air intake valve, a carrier gas intake valve, a water inlet valve, a water outlet valve, and a product gas guide valve. Each valve is responsible for controlling the opening or closing or flow direction of a gas path.
[0035] In a preferred embodiment, the flow reactor 6 includes a capture module 61, a utilization module 62, and a recovery module 63 arranged sequentially along a straight line; the capture module 61 is used to capture CO2 during the non-focused illumination period and for photothermal desorption during the focused illumination period; the utilization module 62 is used for catalytic conversion, where concentrated CO2 and carrier gas enter the utilization module 62 together for catalytic reaction to reduce and produce a mixed gas of CO and H2; the recovery module 63 is used to absorb unreacted CO2 in the utilization module 62; an electromagnetic three-way valve 10 is provided between the capture module 61 and the utilization module 62.
[0036] In this embodiment, the capture module 61 includes a capture tube 611, which is a heat-absorbing tube made of a material with high infrared absorption rate. The sunlight focused by the trough concentrator 9 directly irradiates this heat-absorbing tube, rapidly heating it to 80-100°C, thereby achieving CO2 desorption. During non-focused light periods, the capture tube 611 serves as an air circulation channel for capturing CO2. One end of the collection tube 611 has an air inlet 612, which is connected to the air inlet valve and the carrier gas inlet valve of the multi-way valve array 8 (not shown in the figure); the other end of the collection module 61 is connected to the electromagnetic three-way valve 10; the air inlet valve connects to the atmosphere and the air inlet 612 of the collection tube 611, allowing air to enter the collection tube 611; the carrier gas inlet valve connects to the N2 cylinder and the air inlet 612 of the collection tube 611, allowing N2 to enter the collection tube 611; the collection tube 611 is equipped with a solid adsorbent 613, which is used to capture CO2 in the air. Using 600 mg of SBA-15 PEI adsorbent, and running continuously at a flow rate of 90 ml / min, CO2 in the outflowing gas can be completely removed in about 9 hours. After 18 hours, the adsorbent is saturated, and each gram of adsorbent captures about 87 mg of CO2.
[0037] In this embodiment, the utilization module 62 includes a utilization tube 621, one end of which is connected to an electromagnetic three-way valve 10, and the other end is connected to a recovery module 63. The utilization tube 621 contains a catalytic composite material 625. During the conversion process, titanium dioxide is used as a low-cost photocatalyst, while a chemically fixed cobalt-based molecular catalyst is used as a CO2 reduction co-catalyst. A water jacket 622 is fitted around the utilization tube 621. The water jacket 622 has an inlet 623 and an outlet 624 along its outer circumferential sidewall. The inlet 623 and outlet 624 are respectively connected to the inlet valve and outlet valve of the multi-way valve array 8 (not shown in the figure). The concentrated light causes the internal temperature of the utilization tube 621 to rise, resulting in partial deactivation of the catalytic composite material 625. To solve this problem, a water jacket 622 is added to the outside of the utilization tube 621 to stably control the temperature at 25°C. After the improvement, the CO and H2 generation amounts remain at a high level with good stability.
[0038] In this embodiment, the recovery module 63 includes a recovery pipe 631, one end of which has a second gas outlet 632, and the other end is connected to the utilization pipe 621. The recovery pipe 631 is provided with a recovery composite material 633, which is used to absorb unconverted CO2 in the utilization pipe 621. The second gas outlet 632 is connected to the product gas guide valve of the multi-way valve array 8 (not shown in the figure), and the treated CO and H2 are sent to the methanol preparation device through the product gas guide valve.
[0039] In a preferred embodiment, the trough-type concentrator 9 includes two symmetrically arranged support frames 91 on the ground, with a rotating disk 95 rotatably mounted on one side of each support frame 91; a second motor 92, a second reducer 93, and a belt drive device 94 are disposed inside one of the support frames 91; the rotating disk 95 near the second motor 92 is fixed to the output end of the belt drive device 94; a reflector 96 is disposed between the two rotating disks 95, with both ends of the reflector 96 fixed to the rotating disk 95; the second motor 92 drives the rotating disk 95 to rotate via the second reducer 93 and the belt drive device 94, thereby driving the reflector 96 to rotate, so that it can always track and focus sunlight.
[0040] In this embodiment, the parabolic profile of the reflector 96 is optically optimized to precisely focus sunlight onto the surface of the flow reactor 6. When sunlight (1 solar intensity, 100 mW / cm²) irradiates the collection tube 611 at atmospheric pressure and an air flow rate of 1 ml / min, the temperature of the collection tube 611 under illumination is only 35°C, which is insufficient for CO2 desorption. A trough concentrator 9 is used to focus the sunlight (increasing the intensity to 3 solar intensities), enabling CO2 desorption. However, the uneven distribution of solar flux in the trough concentrator 9 leads to a large temperature gradient on the surface of the absorption tube, reducing system efficiency and potentially causing equipment damage. The addition of a secondary reflector 7 significantly improves the uniformity of heat flux distribution on the surface of the collection tube 611. Furthermore, by optimizing the arrangement of the flow reactor 6, the heat flux on the upper and lower surfaces of the collection tube 611 is effectively balanced, thereby improving the photothermal performance and operational reliability of the trough concentrator 9.
[0041] A process for synthesizing methanol from hydrogen using solar energy includes the following steps:
[0042] Let the two flow reactors be module A and module B, respectively;
[0043] S1. Before operation, air is introduced into the collection tube 611 of module A through the air inlet valve of the multi-way valve array 8. The solid adsorbent 613 efficiently captures CO2 in the air. Using 600 mg of SBA-15 PEI adsorbent, the system operates continuously at a flow rate of 90 ml / min. CO2 in the outflowing gas can be completely removed in about 9 hours. After 18 hours, the adsorbent is saturated, and each gram of adsorbent captures about 87 mg of CO2. The CO2-free gas is discharged to the outside through the electromagnetic three-way valve 10.
[0044] S2. After the operation begins, the first motor 2, via the reducer 3 and rotary encoder 4, drives the support plate 5 to rotate in the forward direction, sending module A to the designated reaction position; Module A: The carrier gas inlet valve of the multi-way valve array 8 introduces N2 into the collection pipe 611 of module A; the second motor 92 in the trough concentrator 9, via the second reducer 93 and belt drive device 94, drives the rotating disk 95 to rotate, thereby driving the reflector 96 to rotate, so that it can always track and focus sunlight (increasing the light intensity to 3). (Based on solar intensity), the adsorbent is heated to 80-100℃ to achieve efficient desorption of captured CO2, forming a concentrated CO2 stream. To address the problem of uneven solar flux distribution in the parabolic trough concentrator 9, which leads to a large temperature gradient on the surface of the absorption tube, thereby reducing system efficiency and potentially causing equipment damage, a secondary reflector 7 is added. This structure significantly improves the uniformity of heat flux distribution on the surface of the collection tube 611. By optimizing the arrangement of the flow reactor 6, the heat flux on the upper and lower surfaces of the collection tube 611 is effectively balanced, thereby improving the photothermal performance and operational reliability of the trough concentrator 9. Concentrated CO2 flows through the electromagnetic three-way valve 10 and is sent into the utilization pipe 621. The catalytic composite material 625 reduces the CO2 to produce CO and H2. At the same time, the water inlet valve of the multi-way valve array 8 introduces water into the water jacket 622 of module A to maintain a constant temperature in the utilization pipe 621. The generated CO and H2 are sent into the recovery pipe 631, and the recovery composite material 633 recovers the residual CO2. The treated CO and H2 are sent into the methanol preparation unit by the product gas guide valve of the multi-way valve array 8.
[0045] Module B: The air intake valve of the multi-way valve array 8 introduces air into the collection tube 611 of module B. The solid adsorbent 613 efficiently captures CO2 in the air, and the CO2-free gas is discharged to the outside through the electromagnetic three-way valve 10.
[0046] S3. After module A completes the reaction (reaction time is 10-12 hours, the specific time depends on the local light intensity), the first motor 2 drives the support plate 5 to rotate 180° in the opposite direction via the reducer 3 and the rotary encoder 4, sending module B to the designated reaction position; Module A: performs the operation of module B in S2 above;
[0047] Module B: The air intake valve of the multi-way valve array 8 introduces air into the collection pipe 611 of module B. The solid adsorbent 613 efficiently captures CO2 in the air, and the CO2-free gas is discharged into the outside through the electromagnetic three-way valve 10. After the sun rises the next day, the operation of module A in S2 above will be performed.
[0048] S4. Modules A and B repeat the operations described in S2-S3, allowing the two flow reactors 6, each with the same "capture-desorption-conversion" function, to alternate roles day and night via a rotating mechanism. This achieves efficient utilization of solar thermal energy while ensuring the directional and continuous flow of reactants. The entire system functions like a "breathing" and "digesting" organism: converting CO2 during the day and capturing CO2 at night, successfully solving the problem of mismatched CO2 capture and conversion rates through a cyclical operation.
[0049] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. An apparatus for the solar production of hydrogen to synthesize methanol, characterized in that: It includes the base (1) fixed to the ground, one side of the base (1) is provided with first motor (2), first speed reducer (3) and rotary encoder (4); the base (1) is provided with two support plates (5) symmetrically, the support plate (5) near the rotary encoder (4) side is fixedly connected with the output end of rotary encoder (4), the support plate (5) away from the rotary encoder (4) side is rotatably connected with the base (1), and the support plate (5) is provided with a multi-way valve array (8) in the middle position; two support plates (5) are provided with flow reactor (6) symmetrically between the two ends of the support plate (5); each flow reactor (6) is provided with a secondary mirror (7) near the middle position of the support plate (5). The base (1) is provided with a groove condenser (9) arranged in parallel with the flow reactor (6).
2. The apparatus for hydrogen production and methanol synthesis from solar energy according to claim 1, characterized in that: The multi-way valve array (8) is a combined system integrated by a plurality of two-position three-way electromagnetic valves according to fluid logic on a common valve block, which includes air inlet valve, carrier gas inlet valve, water inlet valve, water outlet valve and product gas guiding valve.
3. The apparatus for hydrogen production and methanol synthesis from solar energy according to claim 1, characterized in that: The flow reactor (6) includes capture module (61), utilization module (62) and recovery module (63) distributed in a straight line direction; the capture module (61) and the utilization module (62) are provided with an electromagnetic three-way valve (10).
4. The apparatus for hydrogen production and methanol synthesis from solar energy according to claim 3, characterized in that: The capture module (61) includes a capture tube (611), one end of the capture tube (611) is provided with an air inlet (612), the air inlet (612) is connected with the air inlet valve and the carrier gas inlet valve of the multi-way valve array (8); the other end of the capture module (61) is connected with the electromagnetic three-way valve (10); the capture tube (611) is provided with a solid adsorbent (613) inside.
5. The apparatus for hydrogen production and methanol synthesis from solar energy according to claim 4, characterized in that: The utilization module (62) includes a utilization tube (621), one end of the utilization tube (621) is connected with the electromagnetic three-way valve (10), and the other end is connected with the recovery module (63); the utilization tube (621) is provided with a catalytic composite material (625) inside; the utilization tube (621) is provided with a water jacket (622) outside, the water jacket (622) is provided with a water inlet (623) and a water outlet (624) along the outer circumferential side wall; the water inlet (623) and the water outlet (624) are connected with the water inlet valve and the water outlet valve of the multi-way valve array (8) respectively.
6. The apparatus for hydrogen production and methanol synthesis from solar energy according to claim 5, characterized in that: The recovery module (63) includes a recovery tube (631), one end of the recovery tube (631) is provided with a second air outlet (632), and the other end is connected with the utilization tube (621); the recovery tube (631) is provided with a recovery composite material (633) inside; the second air outlet (632) is connected with the product gas guiding valve of the multi-way valve array (8).
7. The apparatus for hydrogen production and methanol synthesis from solar energy according to claim 1, characterized in that: The trough-type concentrator (9) includes two symmetrically arranged support frames (91) on the ground, and a rotating disk (95) is rotatably arranged on one side of each of the two support frames (91); a second motor (92), a second reducer (93) and a belt drive device (94) are arranged inside one of the support frames (91); the rotating disk (95) near the second motor (92) is fixed to the output end of the belt drive device (94); a reflector (96) is arranged between the two rotating disks (95), and both ends of the reflector (96) are fixed to the rotating disk (95).
8. The apparatus for hydrogen production and methanol synthesis from solar energy according to claim 7, characterized in that: The parabolic profile of the reflector (96) is optically optimized to precisely focus sunlight onto the surface of the flow reactor (6).
9. A process for the synthesis of methanol from hydrogen produced by solar energy, using a plant for the synthesis of methanol from hydrogen produced by solar energy according to any one of claims 1 to 8, characterized in that, It includes the following steps: Let the two flow reactors (6) be module A and module B, respectively; S1. Before the start of work, the air intake valve of the multi-way valve array (8) introduces air into the collection pipe (611) of module A. The solid adsorbent (613) efficiently captures CO2 in the air, and the gas without CO2 is discharged into the outside through the electromagnetic three-way valve (10). S2. After the start of work, the first motor (2) drives the support plate (5) to rotate in the forward direction via the first reducer (3) and the rotary encoder (4), sending module A to the designated reaction position; Module A: The carrier gas inlet valve of the multi-way valve array (8) introduces N2 into the collection pipe (611) of module A, and the slotted concentrator (9) and the secondary reflector (7) work together to heat the adsorbent to 80-100℃, achieving efficient desorption of captured CO2 and forming a concentrated CO2 flow; the concentrated CO2 flow passes through the electromagnetic three-way valve ( 10) The CO2 is fed into the utilization pipe (621) and the catalytic composite material (625) is used to reduce CO2 to generate CO and H2. At the same time, the water inlet valve of the multi-way valve array (8) introduces water into the water jacket (622) of module A to keep the temperature inside the utilization pipe (621) constant. The generated CO and H2 are sent into the recovery pipe (631) and the recovery composite material (633) recovers the residual CO2. The treated CO and H2 are sent into the methanol preparation unit by the product gas guide valve of the multi-way valve array (8). Module B: The air intake valve of the multi-way valve array (8) introduces air into the collection tube (611) of module B. The solid adsorbent (613) efficiently captures CO2 in the air, and the CO2-free gas is discharged into the outside through the electromagnetic three-way valve (10). S3. After the reaction is completed, the first motor (2) drives the support plate (5) to rotate 180° in the opposite direction via the first reducer (3) and the rotary encoder (4), and sends module B to the designated reaction position; Module A: performs the operation of module B in S2 above; Module B: The air intake valve of the multi-way valve array (8) introduces air into the collection tube (611) of module B. The solid adsorbent (613) efficiently captures CO2 in the air, and the CO2-free gas is discharged into the outside through the electromagnetic three-way valve (10). After the sun appears the next day, the operation of module A in S2 above is performed. S4. Module A and Module B repeat the operation process of S2-S3 above.