Solar-driven integrated direct air carbon capture system based on cyclic amine

Abstract

The invention discloses a solar-driven integrated direct air carbon capture system based on cyclic amine, which belongs to the technical field of carbon capture and comprises an absorption-desorption core unit, a solar energy supply unit and a resource circulation module. The absorption-desorption core unit comprises a double-layer spherical reactor and a condensing device, and cyclic amine composite absorption liquid is added into the double-layer spherical reactor; and the resource circulation module comprises a CO2 graded collection device and an agricultural facility. According to the invention, the reaction energy barrier is reduced, the desorption temperature is reduced, the energy consumption required by the reaction is reduced, a large amount of low-price desorption liquid amine solution is provided for the DAC technology, the application cost of the DAC technology is reduced, and the comprehensive utilization efficiency of alkaline raw materials in the amine method carbon capture technology is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon capture, and particularly relates to a solar-driven integrated direct air carbon capture system based on cyclic amines. Background Art

[0002] Direct Air Capture (DAC) technology provides a systematic negative carbon solution for implementing the "dual carbon" goal by directly removing carbon dioxide (CO2) from the atmosphere, and has attracted much attention in the academic and industrial fields in recent years. The absorption method mainly uses an absorbent to contact with the mixed gas, and the components in the gas dissolve in the liquid, so that the components of the original mixed gas can be separated.

[0003] For absorption-based DAC, the existing technologies face the following core bottlenecks in practical applications: 1. The most prominent one is the excessively high energy consumption for CO2 capture. Among many capture technologies, the chemical absorption process using amine solutions as absorbents is the most widely used and mature, and it is found that its main energy consumption is for the regeneration of the absorbent. 2. Using polyethylene glycol dimethyl ether, methanol, N-methylpyrrolidone, propylene carbonate, etc. as absorbents, similarly, the absorbent has a high CO2 solubility only under high-pressure conditions, and the process requirements are harsh. 3. Low absorption efficiency at room temperature: Using alkaline liquids such as amino acid salt solutions and potassium carbonate solutions as absorbents, the reactants are unstable salts, and the cost of the absorbents used is high. The dynamic adsorption capacity of traditional adsorbents (such as aniline solution) is <0.8 mmol / g at a CO2 concentration of 400 ppm, resulting in a material cost exceeding $200 / t CO2. 5. High-temperature regeneration requirement: Although the liquid amine system (such as water-based 2,6-pyridine bisiminoguanidine solution) has a high CO2 absorption rate, the regeneration process needs to maintain a temperature close to 120 °C to achieve the regeneration of the amine solution, resulting in an energy consumption as high as 6.5 GJ / t CO2. Summary of the Invention

[0004] To solve the above technical problems, the present invention proposes a solar-driven integrated direct air carbon capture solution based on cyclic amines, which solves the problems of large consumption of adsorbents and low absorption efficiency in the normal-temperature adsorption process, as well as high energy consumption for adsorbent regeneration and short cycle period in the desorption process in the existing DAC technology at low CO2 concentrations.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A solar-driven integrated direct air carbon capture system based on cyclic amines, comprising an absorption-desorption core unit, a solar energy supply unit, and a resource recycling module;

[0007] The absorption-desorption core unit includes a double-layer spherical reactor and a condensation device, and a cyclic amine composite absorbent is added to the double-layer spherical reactor;

[0008] Preferably, the double-layer spherical reactor includes an inner shell and an outer shell;

[0009] The inner shell is used to contain the cyclic amine composite absorbent solution, and the outer shell is provided with a heating element, and the heating element is connected to the auxiliary heating device.

[0010] Preferably, the concentration of the cyclic amine composite absorbent solution is 0.5 - 1.5 mmol / mL.

[0011] Preferably, the solute in the cyclic amine composite absorbent solution includes cyclic amine or modified cyclic amine;

[0012] The cyclic amine includes one or more of 1,3 - cyclohexanediamine, norbornanediamine, and isophoronediamine;

[0013] The modified cyclic amine includes one or more of modified 1,3 - cyclohexanediamine, modified norbornanediamine, and modified isophoronediamine.

[0014] The modified 1,3 - cyclohexanediamine, modified norbornanediamine, and modified isophoronediamine are obtained by extending the carbon chain and introducing amino groups. In a weakly alkaline environment with a pH of 8 - 9, according to the reaction of active hydrogen compounds (usually carbonyl compounds) with formaldehyde and cyclic amines to form β - amino compounds, the proportion of primary amines and secondary amines in the structure of 1,3 - cyclohexanediamine, norbornanediamine, and isophoronediamine is increased for modification, so as to be used as a new type of carbon dioxide absorbent.

[0015] The resource recycling module includes a CO2 classification collection device and agricultural facilities;

[0016] Among them, the double - layer spherical reactor is connected in series with the condensation device, the solar energy supply unit is installed on the double - layer spherical reactor, and the water outlet of the condensation device is connected to the CO2 classification collection device and the agricultural facilities through a three - way valve.

[0017] Beneficial effects: The present invention modifies the cyclic amine to further enhance the activity and quantity of amino functional groups, uses a liquid amine solution to absorb carbon dioxide in ambient air, and improves the CO2 capture efficiency; by designing a double - layer spherical reactor, coupling the high - efficiency coordination of the adsorption - desorption process, and using solar energy to drive the absorption - desorption process to supply energy for the desorption process, the energy utilization efficiency is improved. Through material system innovation, energy coupling optimization, and intelligent control strategies, the core problems existing in traditional absorption - type DAC, such as low absorption efficiency, high regeneration energy consumption, and poor cycle stability, are systematically solved.

[0018] Preferably, the solar energy supply unit includes a solar photovoltaic reactor and an auxiliary heating device, and the solar photovoltaic reactor is electrically connected to the auxiliary heating device;

[0019] Preferably, the cyclic amine-based solar-driven integrated direct air carbon capture system further includes an intelligent control unit, which includes an integrated dual CO2 concentration sensor and a real-time display module;

[0020] The real-time display module is internally equipped with a temperature and humidity sensing device, and the sensing probe part of the temperature and humidity sensing device extends into the double-layer spherical reactor;

[0021] The integrated dual CO2 concentration sensor includes a first CO2 concentration sensor and a second CO2 concentration sensor;

[0022] Air is transmitted to the double-layer spherical reactor through an air pump, and a rotameter and a first CO2 concentration sensor are connected in series between the air pump and the double-layer spherical reactor;

[0023] A second CO2 concentration sensor is connected in series between the condensation device and the resource recycling module.

[0024] Preferably, the auxiliary heating device adopts a water bath circulation heating method, and the desorption temperature is controlled at 60-80 °C through a PID algorithm.

[0025] Preferably, the solar photovoltaic reactor is a monocrystalline silicon module with a conversion efficiency of ≥22%;

[0026] The auxiliary heating device is a semiconductor diode array with a wavelength of 800-1200 nm and a photothermal efficiency of ≥85%.

[0027] Preferably, the intelligent control unit dynamically adjusts the air flow rate and desorption cycle based on the adsorption kinetic model;

[0028] The air flow rate is 100-500 mL / min ± 5%, and the desorption cycle is triggered when the adsorption saturation reaches 90%.

[0029] Preferably, in the resource recycling module, the condensation device is equipped with a recycled water collection bottle (recovery rate ≥ 55%), and the recycled water is used to supplement the amine liquid solvent; the desorbed CO2 is output through a CO2 multi-stage collection device, and the CO2 with a purity > 90% is used for gas fertilizer supply in agricultural facilities.

[0030] Application of a cyclic amine-based solar-driven integrated direct air carbon capture system in agricultural planting.

[0031] Compared with the prior art, the present invention has the following advantages and technical effects:

[0032] The present invention utilizes innovative adsorption materials to achieve carbon capture, ensuring a desorption efficiency exceeding 50%, while reducing the reaction energy barrier, enabling the desorption temperature to be lowered, thereby reducing the energy consumption required for the reaction. This measure provides a large amount of low-cost desorbed liquid amine solution for direct air capture (DAC) technology, significantly reducing the application cost of DAC technology and improving the comprehensive utilization efficiency of alkaline raw materials in amine-based carbon capture technology. In addition, the present invention adopts a double-layer spherical reactor and combines an auxiliary heating device for uniform heating control, so as to be able to continuously complete multiple absorption-desorption cycles. This design overcomes the problems of large adsorbent consumption and low absorption efficiency faced by existing DAC technologies, and also solves the problems of high energy consumption for adsorbent regeneration and short cycle period during desorption. This effectively extends the service life of the amine absorption solution, reduces the maintenance frequency, and further enhances the stability of the continuous operation of the system. Moreover, in response to the problems of existing carbon capture equipment relying on the external power grid and high desorption energy consumption, the present invention proposes a solar-driven integrated direct air carbon capture system based on cyclic amines. This system heats the reactor through solar energy, reduces the dependence on the traditional power grid, significantly reduces the energy consumption, and thus improves the environmental friendliness and economic efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0034] Figure 1 is a schematic structural diagram of the air carbon capture system in Embodiment 1 of the present invention;

[0035] Where the reference numerals are: 1, air pump; 2, first CO2 concentration sensor; 3, second CO2 concentration sensor; 4, double-layer spherical reactor; 5, condensation device; 6, auxiliary heating device; 7, CO2 fractional collection device; 8, air duct; 9, real-time display module; 10, solar photovoltaic reactor; 11, rotameter; 12, temperature and humidity sensor; 13, agricultural facility;

[0036] Figure 2 is a schematic diagram of the working principle of the air carbon capture system in Embodiment 1 of the present invention;

[0037] Figure 3 is a schematic structural diagram of the double-layer spherical reactor in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Unless otherwise specified, the raw materials in the embodiments of the present invention are all obtained through commercial channels;

[0041] Among them, the cyclic amine composite absorbent solution is prepared by mixing cyclic amines (1,3-cyclohexanediamine, norbornanediamine, isophoronediamine), dimethyl sulfoxide, and water according to a volume ratio.

[0042] Unless otherwise specified, the room temperature or normal temperature in the embodiments of the present invention refers to 25 ± 3°C.

[0043] Example 1

[0044] A solar-driven integrated direct air carbon capture system (DAC system) based on cyclic amines, refer to Figure 1 , including an absorption-desorption core unit, a solar energy supply unit, an intelligent control unit, and a resource recycling module.

[0045] The absorption-desorption core unit includes a double-layer spherical reactor 4 and a condensation device 5;

[0046] The solar energy supply unit includes a solar photovoltaic reactor (photovoltaic module) 10 and an auxiliary heating device (photothermal module) 6;

[0047] The intelligent control unit includes an integrated dual CO2 concentration sensor, namely a first CO2 concentration sensor 2 and a second CO2 concentration sensor 3, and also includes an embedded temperature and humidity sensor 12 and a real-time display module 9;

[0048] The resource recycling module includes a CO2 classification collection device 7 and an agricultural facility 13.

[0049] Among them, the air pump 1, the rotameter 11, the first CO2 concentration sensor 2, and the double-layer spherical reactor 4 are connected in series through the air duct 8, and then connected in series with the condensation device 5. The auxiliary heating device 6 and the solar photovoltaic reactor 10 are connected in parallel with the double-layer spherical reactor 4. The water outlet of the condensation device 5 is respectively connected to the CO2 fractional collection device 7 and the agricultural facility 13. At the same time, in the resource recycling module, the condensation device 5 is equipped with a recycled water collection bottle (recovery rate ≥ 55%), and is connected to the double-layer spherical reactor 4 to supplement the amine liquid solvent, forming a circulating reflux structure.

[0050] Reference Figure 3 , the double-layer spherical reactor 4 (reference Figure 3 ) is composed of an inner and an outer shell. The outer layer is a silica aerogel thermal insulation layer (thickness 10 ± 2 mm, thermal conductivity ≤ 0.02 W / m·K), and the inner layer is a polytetrafluoroethylene anti-corrosion cavity (temperature resistance 50 - 260 °C). The inner shell is filled with a solution (liquid cyclic amine composite absorbent solution, absorbent concentration 1.0 ± 0.1 mmol / mL). The outer shell is equipped with heating elements, and the heating elements are connected to the auxiliary heating device 6 to ensure heat supply. The reactor is designed with gas inlets and outlets at the top and solution inlets and outlets at the bottom. Insulating materials are filled between the two shells to improve the heat transfer efficiency. The overall seal of the reactor is good, effectively preventing gas leakage. By optimizing the gas path design and reactor structure, this reactor can improve the CO2 adsorption efficiency, reduce energy consumption, and ensure the long-term stable operation of the system.

[0051] The auxiliary heating device 6 adopts a water bath circulation heating method, and the desorption temperature is controlled at 60 - 80 °C through the PID algorithm.

[0052] Photovoltaic module (monocrystalline silicon module, conversion efficiency ≥ 22%);

[0053] Photothermal module (semiconductor diode array, wavelength 800 - 1200 nm, photothermal efficiency ≥ 85%);

[0054] The solar photovoltaic reactor (photovoltaic module) 10 supplies power to the air pump 1 and the controller, and the auxiliary heating device (photothermal module) 6 provides heat energy for the heating elements of the double-layer spherical reactor;

[0055] The intelligent control unit dynamically adjusts the air flow rate (100 - 500 mL / min ± 5%) and the desorption cycle (desorption is triggered when the adsorption saturation reaches 90%) based on the adsorption kinetic model;

[0056] In the resource recycling module, the condensation device 5 is equipped with a recycled water collection bottle (recovery rate ≥ 55%), and the recycled water is used to supplement the amine liquid solvent; the desorbed CO2 is output through the CO2 multi-stage collection device 7, and the CO2 with purity > 90% is used for gas fertilizer supply in the agricultural facility 13.

[0057] The working principle is as follows: Refer to Figure 2 , the rotor flowmeter 11 monitors that the air pump 1 introduces ambient air into the DAC system through the air duct 8 at a stable intake rate of 50 - 100 L / min. First, the first CO2 concentration sensor 11 measures the CO2 concentration in the environment (usually between 360 - 460 ppm). Subsequently, the air enters the double-layer spherical reactor 4 filled with isophorone diamine liquid amine composite solution (obtained by dissolving isophorone diamine liquid amine in water, with a concentration of 1 mmol / mL), and undergoes a CO2 adsorption process for 6 - 8 hours.

[0058] After the adsorption is completed, the auxiliary heating device 6 heats the double-layer spherical reactor to 60 - 80 °C and maintains it for more than 50 minutes to desorb and discharge CO2. The energy of the auxiliary heating device 6 completely comes from the solar photovoltaic reactor 10. The solar photovoltaic reactor 10 converts solar energy into electrical energy to supply energy to the auxiliary heating device 6. The solar photovoltaic reactor 10 is composed of 6 - 8 monocrystalline silicon modules with a conversion efficiency of 20.5% and has an energy storage function to ensure power supply even in bad weather.

[0059] During the desorption process, relying on the gas pressure change, CO2 is discharged from the double-layer spherical reactor 4, and the water vapor in the air is recovered through the condensation device 5. After the water vapor liquefies, it forms liquid water and is reused. Subsequently, the second CO2 concentration sensor 3 monitors the CO2 concentration after treatment. When the concentration reaches 1000 ppm, it meets the collection standard, and the CO2 is collected through the CO2 grading collection device 7 composed of 1 - 4 500 mL syringes and several gas collection bags. The agricultural facility 13 is connected to the gas path after being processed by the DAC system, so that the high-concentration CO2 directly enters the agricultural facility 13 to promote plant photosynthesis and increase crop yield.

[0060] Examples 2 - 4

[0061] A solar-driven integrated direct air carbon capture system (DAC system) based on cyclic amines, which is different from Example 1 only in that the absorption liquids in the double-layer spherical reactor 4 are respectively equal amounts and equal concentrations of modified 1,3-cyclohexanediamine solution, modified norbornanediamine solution, and modified isophorone diamine solution. Other system structures, working principles, and parameters are the same as those in Example 1.

[0062] Among them, the modified 1,3-cyclohexanediamine, modified norbornanediamine, and modified isophorone diamine are respectively obtained by the step-by-step reaction of cyclic amines, phenols, and aldehydes, specifically including the following steps:

[0063] Add a certain amount of phenol into the reactor, and add 1 - 2 mL of ammonia water. Maintain the pH between 8 - 9, stir and heat up, and control the temperature within the range of 50 - 60 °C. Subsequently, add 1,3 - cyclohexanediamine, norbornanediamine or isophoronediamine respectively, stir and dropwise add a certain amount of formaldehyde solution, control the reaction temperature range at 50 - 60 °C. After the formaldehyde is added dropwise, maintain the reaction for a period of time within this temperature range. Slightly increase the reaction temperature, control the reaction time within 2 hours, and during the reaction process, observe the reaction situation, test the amine value of the reaction product at regular intervals, determine that the amine value increases significantly and remains stable, then end the reaction process to obtain the modified cyclic amine.

[0064] Through the innovative DAC adsorption technology, the present invention provides a large amount of highly efficient absorbing liquid amine solution for it, reduces the application cost of the technology, and improves the comprehensive utilization efficiency of raw materials in the amine - based carbon capture technology. During the implementation process of the present invention, ambient air is used as the capture inlet gas of the DAC system to achieve low - concentration CO2 cyclic capture, and compared with the conventional DAC for capturing low - concentration CO2 from the air, the CO2 capture efficiency is increased by 20 - 30%.

[0065] Comparative Example 1

[0066] A solar - driven integrated direct air carbon capture system (DAC system) based on cyclic amine, which is different from Example 1 only in that the absorbent liquid in the double - layer spherical reactor 4 is a monoethanolamine solution with the same amount and concentration. Other system structures, working principles and parameters are the same as those in Example 1.

[0067] This comparative example compares the absorption capacities of isophoronediamine solution and monoethanolamine solution at the same concentration. The carbon dioxide absorption content is nearly 2 times, and the absorption efficiency of isophoronediamine solution is also much higher than that of monoethanolamine solution. During the desorption process, the desorption temperature of monoethanolamine solution exceeds 100 °C, the desorption temperature is higher, it is not easy to regenerate, and the energy consumption is high.

[0068] Comparative Example 2

[0069] A solar - driven integrated direct air carbon capture system (DAC system) based on cyclic amine, which is different from Example 1 only in that the double - layer spherical reactor 4 is replaced by a straight - tube reactor. Among them, the straight - tube reactor is made of 316L stainless steel and contains the same volume of isophoronediamine solution.

[0070] Other system structures, working principles and parameters are the same as those in Example 1.

[0071] During the experiment of this comparative example, the surface heat dissipation area of the straight-tube reactor increased significantly, and the measured heat energy loss during the desorption stage reached 22%. At the same time, compared with the double-layer spherical reactor, the straight-tube structure led to a significant axial velocity gradient of the gas flow, a reduction in the gas-liquid contact area, and a significant decrease in the mass transfer coefficient. Compared with the double-layer spherical reactor, the temperature uniformity of the straight-tube reactor was poor (ΔT≥8.5°C), and the high-temperature area (>95°C) caused thermal degradation of the amine solution.

[0072] Comparative Example 3

[0073] A solar-driven integrated direct air carbon capture system (DAC system) based on cyclic amines, which is different from Example 1 only in that it does not include a solar energy supply unit. Other system structures, working principles, and parameters are the same as those in Example 1.

[0074] The auxiliary heating device in this comparative example relies on electric heating (efficiency≈95%), and the desorption energy consumption increases by 20-30% compared with Example 1. The power consumption of the air pump during the adsorption stage depends entirely on the power grid without photovoltaic supplementation. Compared with the present invention, the regulation of the auxiliary heating power lags behind during grid power supply (response time>30s), and the desorption temperature fluctuates>±5°C, resulting in an accelerated thermal degradation of the amine solution.

[0075] Example 2

[0076] Using the DAC system in Example 1, the schematic diagram of the system structure is as Figure 1 shown. It was implemented in the tomato planting base of Duguitala in Inner Mongolia. The planted crop was yellow tomatoes (variety: Wuyuan yellow persimmons). The dual promotion effect of CO2 gas fertilizer on crop yield and nutritional quality was mainly verified. The specific data is as follows:

[0077] Yellow tomatoes belong to an excellent vegetable variety with indeterminate growth type and excellent production performance. Through on-site yield measurement and indoor analysis, the single fruit weight of randomly picked yellow tomatoes in each greenhouse in Duguitala was between 212 and 345 g. Among them, the average single fruit weight of large yellow tomatoes in the greenhouse treated with gas fertilizer was 278.44 g (2 trays of fruits, 10 means), which was 18.84% higher than the single fruit weight of 232.35 g in the control greenhouse, and the yield increase effect was significant. Thus, it can be seen that the gas fertilizer has a very obvious yield increase effect.

[0078] Table 1 Comparison table of nutrient contents of yellow tomatoes in the gas fertilizer treatment shed and the control shed (per 100 g)

[0079]

[0080]

[0081] As can be seen from Table 1, after the addition of carbon dioxide gas fertilizer obtained by the system of Example 1, in addition to increasing the tomato yield, various nutritional indicators of tomatoes have also undergone significant changes. Among them, the sugar content after gas fertilizer treatment increased from 4.2 to 5.5, an increase of 30.95%, and its sweetness and taste were significantly improved; its vitamin C content also increased from 15.6μg in conventional greenhouse planting to 16.5μg, an increase of 5.77%; its lycopene content increased from 0.0213mg / g to 0.0278mg / g, an increase of 30.52%. As can be seen from Table 1, except for vitamin B1, zinc and copper, most of the indicators showed an upward trend. It can be seen that the CO2 gas fertilizer obtained by the present invention has a great effect on improving the taste and nutritional quality of tomatoes.

[0082] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A solar-driven integrated direct air carbon capture system based on cyclic amines, characterized in that: It includes an absorption-desorption core unit, a solar energy supply unit and a resource recycling module; The absorption-desorption core unit comprises a double-layer spherical reactor and a condensing device, and a cyclic amine composite absorption liquid is added to the double-layer spherical reactor; The resource recycling module includes a CO2 classification collection device and agricultural facilities; The double-layer spherical reactor is connected in series with a condensing device, the solar energy supply unit is installed on the double-layer spherical reactor, and the water outlet of the condensing device is connected to the CO2 grading collection device and the agricultural facility through a three-way valve.

2. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 1, characterized in that: The double-layer spherical reactor comprises an inner shell and an outer shell; The inner shell is used to contain the cyclic amine composite absorption liquid, and the outer shell is provided with a heating element, which is connected to the auxiliary heating device.

3. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 2, characterized in that: The concentration of the cyclic amine composite absorption liquid is 0.5-1.5 mmol / mL.

4. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 3, characterized in that: The solute in the cyclic amine composite absorption liquid includes cyclic amine or modified cyclic amine; The cyclic amine includes one or more of 1,3-cyclohexanediamine, norbornanediamine, and isophoronediamine; The modified cyclic amine includes one or more of modified 1,3-cyclohexanediamine, modified norbornanediamine, and modified isophoronediamine.

5. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 1, characterized in that: The solar energy supply unit comprises a solar photovoltaic reactor and an auxiliary heating device, and the solar photovoltaic reactor is electrically connected to the auxiliary heating device.

6. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 1, characterized in that: Also included is an intelligent control unit, which includes an integrated dual CO2 concentration sensor and a real-time display module; The real-time display module is internally provided with a temperature and humidity sensor, and the sensing probe of the temperature and humidity sensor extends into the double-layer spherical reactor; The integrated dual CO2 concentration sensor comprises a first CO2 concentration sensor and a second CO2 concentration sensor, wherein the first sensor is located at the inlet end of the double-layer spherical reactor to monitor the inlet components, and the second sensor is located at the outlet end of the double-layer spherical reactor to detect the CO2 concentration in the tail gas; Air is transmitted to the double-layer spherical reactor through an air pump, and a rotor flowmeter and a first CO2 concentration sensor are connected in series between the air pump and the double-layer spherical reactor; A second CO2 concentration sensor is connected in series between the condensing device and the resource circulation module.

7. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 1, characterized in that: The auxiliary heating device adopts a water bath circulation heating method, and the desorption temperature is controlled to be 60-80°C through a PID algorithm.

8. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 1, characterized in that: The solar photovoltaic reactor is a single crystal silicon component with a conversion efficiency of ≥22%; The auxiliary heat device is a semiconductor diode array with a wavelength of 800-1200nm and a photothermal efficiency of ≥85%.

9. A solar-driven integrated direct air carbon capture system based on cyclic amines according to claim 1, characterized in that: The intelligent control unit dynamically adjusts the air flow rate and desorption cycle based on the adsorption kinetics model; The air flow rate is 100-500 mL / min±5%, and the desorption cycle is triggered when the adsorption saturation reaches 90%.

10. Application of a solar-driven integrated direct air carbon capture system based on cyclic amines as claimed in claim 1 in agricultural planting.

Images