DCA system integration device and carbon capture method

Abstract

The invention provides a DCA system integration device and a carbon capture method, and is characterized in that the device comprises a carbon capture module, a mineralization treatment module and an automatic control module, and also comprises a carbon capture solution regeneration module, a hydration reaction module, a pure CO2 acquisition module and a waste heat recovery module; after the DCA system integration device and the carbon capture method are used for capturing the carbon dioxide in the air, the captured carbon dioxide can be recovered in a mineralizer form or a pure carbon dioxide form; meanwhile, in the carbon capture and follow-up treatment process, low-energy-consumption regeneration and cyclic utilization of renewable energy sources are achieved, and heat energy generated in the carbon capture and follow-up treatment process can be recycled and applied. The whole efficiency of the DCA system is greatly improved, and the DCA system is energy-saving, environment-friendly and worthy of popularization and application.

Description

Technical Field

[0001] The present invention belongs to the technical field of air treatment, and particularly relates to a DAC (Direct Air Capture) system integration device for directly capturing and storing carbon in the air and a carbon capture method. Background Art

[0003] Currently, the internationally recognized carbon capture technologies are two approaches: CCS (Carbon Capture and Storage), CCUS (Carbon Capture, Utilization and Storage), and DAC (Direct Air Capture). Among them, CCS / CCUS (carbon capture and storage) refers to the technology of collecting carbon dioxide generated by fossil fuels and storing it by various methods to prevent it from entering the atmosphere. It is carbon captured during the consumption of fossil energy, such as carbon capture during the flue gas emissions of power plants or steelmaking furnaces.

[0004] DAC (direct air carbon capture and storage) is one of the few technologies that can directly remove carbon dioxide from the atmosphere. Absorbing carbon dioxide through vegetation (BEDAC) also belongs to this category. The methods other than BEDAC filter a huge amount of air through special equipment and capture carbon dioxide from the air by absorption or adsorption to achieve negative carbon dioxide emissions. The absorption and adsorption methods are further divided into physical and chemical methods. The main technical solution of the chemical absorption method is to use sodium hydroxide to absorb carbon dioxide to form sodium carbonate, and then use the causticization process of adding calcium salts to regenerate sodium hydroxide.

[0005] The defects of the existing DAC technology are as follows: (1) Since the content ratio of carbon dioxide in outdoor air is extremely low, taking medium-concentration emission sources (petrochemical, steelmaking) as an example, the CO2 concentration in the air treated by CCS is about 20%, while the CO2 concentration in outdoor air is 0.04%. Therefore, the DAC system needs to process a huge amount of air to capture sufficient carbon dioxide, resulting in extremely high air-driven energy consumption and high equipment investment costs.

[0006] (2) After capturing carbon dioxide by the absorption method, the calcium salts used to regenerate sodium hydroxide also need to be regenerated again to obtain the carbon dioxide captured from the air and then processed into a packaging form suitable for long-distance transportation and long-term storage. The process of regenerating calcium salts in traditional DAC technology requires extremely high temperatures (≫900°C) for calcination, which requires extremely high energy consumption.

[0007] If the investment cost of the DAC system is high and the operating energy consumption is high, then DAC often becomes a showy project with little actual effect. As a carbon capture project, its purpose is to remedy the problem of excessive outdoor air CO2 content caused by the combustion of fossil fuels. However, achieving this purpose with excessive energy consumption goes against the original intention of the technology. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a novel-structured, strong carbon capture-capable, low-energy-consuming DCA system integration device and a carbon capture method. Carbon dioxide in the air is captured by a carbon capture solution and then, through chemical treatment, the carbon dioxide in the air is recovered in the form of mineralized substances or in the form of pure CO2. During the carbon capture and subsequent chemical treatment processes, renewable energy is regenerated with low energy consumption and recycled.

[0009] To achieve the invention purpose, the technical solutions adopted by the present invention are as follows: The present invention provides a DAC system integration device, including a carbon capture module, a mineralization treatment module, and an automatic control module; The carbon capture module includes a carbon capture tower 1 and an externally placed carbon capture solution storage tank 8; an air inlet 107 is provided in the middle and lower part of the tower body of the carbon capture tower 1, an air outlet and an exhaust device 101 are provided at the top of the tower body, and a liquid distributor 103, a heat and humidity exchange device, a liquid guiding member 108, and a tower bottom solution tank are provided at intervals from top to bottom in the tower body; the heat and humidity exchange device is composed of a heat and humidity exchange core 106 and a first heat exchanger 105 embedded therein, the tower bottom solution tank is composed of a first solution tank 110 in the middle and second solution tanks 109 on both sides or around the first solution tank 110, and the liquid guiding member 108 covers the first solution tank 110; the carbon capture solution storage tank 8 transports the carbon capture solution (strong base) to the first solution tank 110 through a pipeline, the carbon capture solution (strong base) stored in the first solution tank 110 is pumped to the liquid distributor 103 through an internal circulation pipeline, and when the downwardly sprayed carbon capture solution (strong base) flows through the heat and humidity exchange device, it absorbs CO2 in the upwardly flowing air, and the generated C-containing solution is all introduced into the second solution tank 109 by the liquid guiding member 108; The mineralization treatment module includes a flocculation reaction tank 3 and a solid-liquid separation device 4. Two feed ports are provided at the upper part of the flocculation reaction tank 3, which are respectively connected to the discharge ports of the second solution tank 109 and the dilute flocculant solution storage tank 9 through pipelines. The C-containing solution and the dilute flocculant (chloride) solution transported into the flocculation reaction tank 3 undergo a flocculation reaction to generate flocculated carbonate and a first intermediate reactant solution. Two discharge ports are provided at the lower part of the flocculation reaction tank 3, which are respectively connected to the solid-liquid separation device 4 and the feed port of the first intermediate reactant solution storage tank 17 through pipelines. The generated first intermediate reactant solution is transported to the first intermediate reactant solution storage tank 17, and the generated flocculated carbonate is transported to the solid-liquid separation device 4. After solid-liquid separation, the separated water is transported to the water storage tank 14, and the dehydrated carbonate is discharged to the mineralized substance container 18 for storage.

[0010] Furthermore, a DAC system integration device provided by the present invention further includes a carbon capture solution regeneration module, a hydration reaction module, and a pure CO2 acquisition module. The carbon capture solution regeneration module includes an electrolytic cell 5. The feed ports of the electrolytic cell 5 are respectively connected to the discharge ports of the water storage tank 14 and the first intermediate reactant solution storage tank 17 through pipelines. The water and the first intermediate reactant solution transported into the electrolytic cell 5 undergo an electrolytic reaction to generate a carbon capture solution (strong base), anodic electrolytic gas (H2), and cathodic electrolytic gas (CL2). The generated carbon capture solution (strong base) is transported to the carbon capture solution storage tank 8 through a pipeline. The hydration reaction module includes a scrubbing tower 6. The upper feed port of the scrubbing tower 6 is connected to the discharge port of the water storage tank 14 through a pipeline, and the lower feed port of the scrubbing tower 6 is connected to the cathodic exhaust port of the electrolytic cell 5 through a pipeline. The water and the cathodic electrolytic gas (CL2) entering the scrubbing tower 6 from the upper and lower feed ports of the scrubbing tower undergo a hydration reaction to generate a second intermediate reactant (HCl) solution, which is transported to the second intermediate reactant solution storage tank 19 through a pipeline. The pure CO2 acquisition module includes a metathesis reaction tank 7. The feed ports of the metathesis reaction tank 7 are respectively connected to the discharge ports of the second intermediate reactant solution storage tank 19 and the mineralized substance container 18 through pipelines. The second intermediate reactant (HCl) solution and the carbonate added to the metathesis reaction tank 7 undergo a metathesis reaction to generate a concentrated flocculant (chloride) solution, water, and pure CO2. The products are respectively transported to the concentrated flocculant solution storage tank 10, the water storage tank 14, and the CO2 storage tank 13 for storage.

[0011] Furthermore, the DAC system integration device provided by the present invention also includes a waste heat recovery module, which includes an absorption heat pump and corresponding fluid pipelines. The flocculation reaction tank 3 and the metathesis reaction tank 7 are respectively provided with a second and a third heat exchanger. The absorption heat pump is respectively connected to the first heat exchanger in the carbon capture tower 1, the second heat exchanger in the flocculation reaction tank 3, and the third heat exchanger in the metathesis reaction tank 7 through fluid pipelines. The heat energy generated in the carbon capture tower 1, the flocculation reaction tank 3, and the metathesis reaction tank 7 is transported to the absorption heat pump.

[0012] The concentrated solution inlet of the absorption heat pump is connected to the discharge port of the flocculant concentrated solution storage tank 10, and the dilute solution outlet of the absorption heat pump is connected to the feed port of the flocculant dilute solution storage tank 9. The flocculant (chloride) concentrated solution is the working medium of the absorption heat pump. The flocculant (chloride) concentrated solution enters the absorption heat pump and generates a dilute flocculant (chloride) solution after absorbing the refrigerant water, which is stored in the dilute flocculant solution storage tank 9.

[0013] The heat and moisture exchange device is composed of a heat and moisture exchange core 106 and a first heat exchanger 105 embedded therein. The first heat exchanger is composed of multiple layers of capillaries arranged up and down, and each layer of capillaries is attached to the heat and moisture exchange core. The heat and moisture exchange core is covered with gas-liquid channels running through it from top to bottom.

[0014] When the second solution tank 109 is located on both sides of the first solution tank 110, the liquid guiding member 108 is an inverted V-shaped structure having two liquid guiding planes; when the second solution tank 109 is located around the first solution tank 110, the liquid guiding member 108 is a cone structure; a siphon is provided between the first and second solution tanks, and a solution channel is provided on the upper part of the two solution tanks. The control module automatically controls the liquid level in the first and second solution tanks, so that the solution at the bottom of the second solution tank 109 flows into the first solution tank 110 through the siphon, or the solution at the upper part of the second solution tank 109 flows into the first solution tank 110 through the solution channel.

[0015] The C-containing solution in the second solution tank 109 is composed of a carbon capture solution (strong base) and a carbonate solution. Due to the different specific gravities of the components, the solutions are stratified. The control module automatically controls the liquid levels in the first and second solution tanks to allow the carbon capture solution (strong base) concentrated in the upper or lower layer of the C-containing solution to flow from the second solution tank 109 into the first solution tank 110, thereby fully utilizing the carbon capture solution (strong base).

[0016] A liquid baffle is provided at the air outlet of the carbon capture tower to prevent the carbon capture solution sprayed by the liquid distributor 103 from being sucked out of the carbon capture tower by the exhaust device.

[0017] The present invention provides a carbon capture method for a DCA system integrated device, which is characterized by comprising the following steps: S1. Capture carbon dioxide in the air in the carbon capture tower: The carbon capture solution storage tank 8 transports the carbon capture solution (strong base) to the first solution tank 110 in the carbon capture tower 1. The carbon capture solution (strong base) stored in the first solution tank 110 is pumped to the liquid distributor 103 through the internal circulation pipeline. When the downwardly sprayed carbon capture solution (strong base) flows through the heat and humidity exchange device, it absorbs CO2 in the upward flowing air, and the resulting C-containing solution is all introduced into the second solution tank 109 by the liquid guide member 108; the C-containing solution is composed of carbonate solution and carbon capture solution (strong base). The automatic control module controls the liquid levels in the first and second solution tanks, so that the carbon capture solution concentrated on the upper or lower layer of the C-containing solution flows from the second solution tank 109 into the first solution tank 110. S2. Mineralize the captured carbon dioxide: Transport the C-containing solution in the second solution tank 109 and the dilute solution of the flocculant (chloride) in the flocculant dilute solution storage tank 9 to the flocculation reaction tank 3. The C-containing solution reacts with the dilute solution of the flocculant (chloride) to generate flocculated carbonate and the first intermediate reactant solution. The generated first intermediate reactant solution is transported to the first intermediate reactant solution storage tank 17 for storage, and the generated flocculated carbonate is transported to the solid-liquid separation device 4. After solid-liquid separation, the separated water is transported to the water storage tank 14 for storage, and the dehydrated carbonate is discharged to the mineralized container 18 for storage.

[0018] Furthermore, the present invention provides a carbon capture method for a DCA system integration device, which is characterized in that, in addition to the operation steps S1 and S2, it further includes the following operation steps: S3. Regenerate the carbon capture solution: Transport the water and the first intermediate reactant solution stored in the water storage tank 14 and the first intermediate reactant solution storage tank 17 to the electrolytic cell 5 for electrolysis reaction to generate carbon capture solution (strong base), anodic electrolysis gas (H2), and cathodic electrolysis gas (CL2). The generated carbon capture solution (strong base) is transported through a pipeline to the carbon capture solution storage tank 8 and continues to be used for carbon capture reaction; S4. Carry out a hydration reaction: The water storage tank 14 and the electrolytic cell 5 respectively transport water and cathodic electrolysis gas (CL2) to the scrubber 6. The water added from the upper end of the scrubber and the cathodic electrolysis gas (CL2) added from the lower end of the scrubber undergo a hydration reaction in the scrubber 6, and the generated second intermediate reactant (HCL) solution is transported through a pipeline to the second intermediate reactant solution storage tank 19; S5. Obtain pure CO2: The second intermediate reactant (HCl) solution generated in the scrubbing tower 6 and the carbonate dehydrated by the solid-liquid separation device are transported into the double decomposition reaction tank 7. The second intermediate reactant (HCl) solution and the carbonate undergo a double decomposition reaction in the double decomposition reaction tank 7 to generate a concentrated solution of the flocculant (chloride), water, and pure CO2. The products are respectively transported through pipelines to the concentrated flocculant solution storage tank 10, the water storage tank 14, and the CO2 storage tank 13 for storage. The generated pure CO2 is the result of air carbon capture.

[0019] The concentrated flocculant solution storage tank 10 is connected to the dilute flocculant solution storage tank 9 through a pipeline. The concentrated flocculant solution storage tank 10 replenishes the dilute flocculant solution storage tank 9 with the flocculant (chloride) solution, realizing the reuse of the flocculant (chloride) solution.

[0020] Alternatively, the discharge port of the concentrated flocculant solution storage tank 10 is connected to the concentrated solution inlet of the absorption heat pump, and the dilute solution outlet of the absorption heat pump is connected to the feed inlet of the dilute flocculant solution storage tank 9. The concentrated flocculant (chloride) solution serves as the working medium of the absorption heat pump. The concentrated flocculant (chloride) solution provided by the concentrated flocculant solution storage tank 10 enters the absorption heat pump, generates a dilute flocculant (chloride) solution after absorbing the coolant, is stored in the dilute flocculant solution storage tank 9, and then is transported to the flocculation reaction tank 3 to participate in the flocculation reaction; the concentrated flocculant (chloride) solution is regenerated in the double decomposition reaction tank 7 and stored in the concentrated flocculant solution storage tank 10, realizing the regeneration and recycling of the flocculant (chloride).

[0021] The carbon capture method of the DCA system integration device of the present invention provides two carbon capture and recovery forms. One is the recovery in the form of mineralized substances (carbonates), and the other is the recovery in the form of pure CO2. The provided operation steps specifically include the process of capturing and mineralizing carbon dioxide in the air, the process of regenerating the chemical substances used in the chemical treatment process, and the process of converting carbon dioxide in the air into pure CO2.

[0022] Capture carbon dioxide in the air through the carbon capture solution (strong base), and then through chemical treatment, realize the recovery of carbon dioxide in the air in the form of mineralized substances (carbonates) or in the form of pure CO2. The carbon capture and recovery form can be selected as needed.

[0023] The beneficial effects of the present invention: The present invention provides a DAC system integration device, including a carbon capture module and a mineralization treatment module, which can capture carbon dioxide in the air and recover it in the form of mineralization; further including a carbon capture solution regeneration module, a hydration reaction module, and a pure CO2 acquisition module, which can regenerate the carbon capture solution, regenerate the flocculant (chloride) solution, and recover the carbon dioxide captured in the air in the form of pure carbon dioxide. The entire DAC system device of the present invention has a reasonable layout, a streamlined and compact system composition, and the carbon capture process and subsequent chemical treatment process are energy-saving and environmentally friendly, realizing the regeneration and recycling of renewable materials.

[0024] Correspondingly, a carbon capture method for the DCA system integration device provided by the present invention uses a carbon capture tower as a capturer for capturing carbon dioxide in the air. In the carbon capture tower, the circulating spray of the carbon capture solution (strong base) combines with CO2 in the air to form carbonate, and then through chemical treatment, the carbon dioxide in the air is recovered in the form of mineralization or in the form of pure CO2, and the renewable materials used in the chemical treatment process are regenerated and recycled.

[0025] Furthermore, the present invention is also provided with a waste heat recovery module, which can recover and utilize the low-level heat energy generated in the carbon capture tower 1, the first and double decomposition reaction tanks in the DAC system, adding new performance to the DAC system.

[0026] The carbon capture tower 1 provided by the present invention has the characteristics of novel structure and strong carbon capture ability. A heat and moisture exchange device with an independently developed structure is provided in the carbon capture tower 1, which not only has the function of heat and moisture exchange, but also improves the full contact between the carbon capture solution and the air, enhancing the carbon capture effect; the solution tank at the bottom of the carbon capture tower 1 is divided into a first solution tank 110 for storing the carbon capture solution (strong base) and a second solution tank 109 for collecting the C-containing solution. The first solution tank 110 is equivalent to a carbon capture solution storage tank, which can ensure the cyclic operation of the carbon capture solution (strong base) and its carbon capture efficiency. The carbon capture solution (strong base) absorbs CO2 in the air to form a C-containing solution, which is all introduced into the second solution tank 109 by a liquid guiding member. At the same time, a siphon tube is provided between the first and second solution tanks, and a solution channel is provided at the upper part of the two solution tanks. The automatic control module automatically controls the liquid levels in the first and second solution tanks, so that the bottom solution of the second solution tank 109 flows into the first solution tank 110 through the siphon tube, or the upper solution of the second solution tank 109 flows into the first solution tank 110 through the solution channel. The C-containing solution in the second solution tank 109 is stratified due to different component specific gravities. The automatic control module controls the liquid levels in the first and second solution tanks, so that the carbon capture solution concentrated in the upper or lower layer of the C-containing solution flows from the second solution tank 109 into the first solution tank 110, enabling the full utilization of the carbon capture solution (strong base).

[0027] The carbon capture tower provided by the present invention, in addition to having the function of capturing CO2 from the air, can also output cold and heat energy through the first heat exchanger. Therefore, it has a cooling function similar to that of the cooling towers used in air conditioning systems and temperature control systems in the manufacturing industry, as well as a heating function of a heat source tower (energy tower) that has attracted attention as a new type of renewable energy. On this basis, the cooling towers currently used in existing air conditioning systems and temperature control systems in the manufacturing industry can be adapted and transformed into the carbon capture tower of the present invention, and while not affecting their original heat exchange function, the carbon capture function of the present invention for air can be realized at the same time. For example, by using the function of heat exchange between the liquid and air in a closed cooling tower and replacing the sprayed water with a carbon capture solution, the heat exchange function of the cooling tower is not affected, and at the same time, the sprayed carbon capture solution absorbs carbon dioxide in the air to generate a carbon-containing solution, thus realizing the carbon capture function. Cooling towers are widely used in the industrial and refrigeration and air conditioning fields. By implanting the air capture function into existing cooling towers, the existing widely distributed cooling towers can be combined with the DAC system of the present invention, which can reduce the equipment investment of the DAC system integration device, realize the carbon capture function by sharing the driving energy consumption with the existing air conditioning system or temperature control system in the manufacturing industry, and can also greatly reduce the overall operating energy consumption of the DAC system, making it easier to be popularized and used.

[0028] Compared with the technologies that have been published currently, the present invention realizes energy conservation and utilization of renewable energy in three high-energy-consuming links: a) The energy consumption of driving air is shared with the functions of the cooling tower / heat source tower that provides cold and heat energy, so that the energy consumption is no longer solely borne by the CO2 recovery amount, and the direct energy consumption of DAC is greatly reduced; b) In the regeneration process of the absorbent and flocculant (chloride), high-temperature roasting is no longer used, but electrolysis (photovoltaic) and hydration (light irradiation) are adopted, so that the air capture makes full use of the existing energy consumption and renewable energy that have occurred; c) The heat energy generated in the DAC process is fully collected and used as a low-grade heat source (≤60 °C), such as for building heating in winter or the preparation of domestic hot water, achieving the goals of low cost, low energy consumption, and low pollution for carbon capture. Description of the Drawings: Figure 1 It is a schematic structural and technological process diagram of the DAC system integration device and the carbon capture method of the present invention in Embodiment 1; Figure 2 It is a schematic structural and technological process diagram of the DAC system integration device and the carbon capture method of the present invention in Embodiment 2; Figure 3 It is a simplified technological process diagram of the carbon capture method in Embodiment 2; Figure 4 It is a schematic structural diagram of the carbon capture tower of the present invention; Figure 5 It is a schematic diagram of a matching structure of the liquid guiding member and the first and second solution tanks of the present invention; Figure 6Schematic diagram of another matching structure of the liquid guiding member and the first and second solution tanks of the present invention; Figure 7 Schematic diagram of the structure of the heat and moisture exchange device in the carbon capture tower of the present invention; Figure 8 Schematic diagram of the structure of the first heat exchanger of the present invention.

[0030] Description of main reference numerals: 1 Carbon capture tower, 3 Flocculation reaction tank, 4 Solid-liquid separation device, 5 Electrolytic cell, ⑥ Scrubbing tower,⑦ Double decomposition reaction tank 8 Carbon capture solution storage tank, 9 Flocculant dilute solution storage tank, 10 Flocculant concentrated solution storage tank, 11 Anodic electrolytic gas storage tank, 13 CO2 storage tank, 14 Water storage tank, 15 Second heat exchanger 16 Third heat exchanger 17 First intermediate reactant solution storage tank 18 Mineralizer container; <19> Second intermediate reactant solution storage tank; 101 Exhaust device 102 Baffle plate 103 Liquid distributor 104 Tower body 105 First heat exchanger 106 Heat and moisture exchange core 107 Air inlet 108 Liquid guiding member 109 Second solution tank 110 First solution tank 111 Liquid supply pipeline 112 Solution circulation pump 113 Internal circulation pipeline 114 Carbon-containing solution discharge pipe 115 Solution tank partition 116 Siphon 117 Fluid pipeline. Detailed implementation manners

[0031] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0032] In the embodiments of the present invention, the carbon capture solution involved is described by taking NaOH as an example, and the flocculant (chloride) involved is described by taking CaCl2 as an example. Embodiment 1

[0033] As Figure 1 shown, a DAC system integration device provided by the present invention includes a carbon capture module, a mineralization treatment module, and an automatic control module; As Figure 4As shown, the carbon capture module includes a carbon capture tower 1 and an external carbon capture solution storage tank 8; an air inlet 107 is provided in the middle and lower part of the tower body of the carbon capture tower 1, an air outlet and an exhaust device 101 are provided at the top of the tower body, and a liquid distributor 103, a heat and humidity exchange device, a liquid guiding member 108, and a bottom solution tank are arranged at intervals from top to bottom in the tower body; the heat and humidity exchange device is composed of a heat and humidity exchange core 106 and a first heat exchanger 105 embedded therein, the bottom solution tank is composed of a first solution tank 110 in the middle and second solution tanks 109 on both sides or around the first solution tank 110, and the liquid guiding member 108 covers the first solution tank 110; the carbon capture solution storage tank 8 transports carbon capture solution (strong base) to the first solution tank 110 through a liquid supply pipeline 111, and the carbon capture solution (strong base) stored in the first solution tank 110 is transported to the liquid distributor 103 through a solution circulation pump 112 and an internal circulation pipeline 113. After the carbon capture solution (strong base) sprayed downward by the liquid distributor 103 flows through the heat and humidity exchange device, it is all introduced into the second solution tank 109 by the liquid guiding member 108. The carbon capture solution (strong base) flowing in the carbon capture tower absorbs CO2 in the upward flowing air, and the generated C-containing solution flows into the second solution tank 109; The mineralization treatment module includes a flocculation reaction tank 3 and a solid-liquid separation device 4; two feeding ports are provided in the upper part of the flocculation reaction tank 3, which are respectively connected to the discharge ports of the second solution tank 109 and the flocculant dilute solution storage tank 9 through pipelines. The C-containing solution and the flocculant (chloride) dilute solution transported into the flocculation reaction tank 3 undergo a flocculation reaction to generate flocculated carbonate and a first intermediate reactant solution; two discharge ports are provided in the lower part of the flocculation reaction tank 3, which are respectively connected to the solid-liquid separation device 4 and the feeding port pipeline of the first intermediate reactant solution storage tank 17; the generated first intermediate reactant solution is transported to the first intermediate reactant solution storage tank 17, and the generated flocculated carbonate is transported to the solid-liquid separation device 4. After solid-liquid separation, the separated water is transported to the water storage tank 14, and the dehydrated carbonate is discharged to the mineralized material container 18 for storage.

[0034] As Figure 4 shown, a liquid baffle 102 is provided at the air outlet of the carbon capture tower 1 to prevent the carbon capture solution (strong base) sprayed by the liquid distributor 103 from being sucked outside the carbon capture tower by the exhaust device 101.

[0035] As Figure 6 shown, when the second solution tank 109 is located on both sides of the first solution tank 110, the liquid guiding member 108 is an inverted V-shaped structure with two liquid guiding planes.

[0036] As Figure 5 shown, when the second solution tank 109 is located around the first solution tank 110, the liquid guiding member 108 is a cone structure.

[0037] As Figure 5 、Figure 6 As shown, a siphon is provided between the first and second solution tanks. Solution channels are provided at the upper parts of the two solution tanks. The control module automatically controls the liquid levels in the first and second solution tanks, so that the bottom solution of the second solution tank 109 flows into the first solution tank 110 through the siphon, or the upper solution of the second solution tank 109 flows into the first solution tank 110 through the solution channel. The C-containing solution in the second solution tank 109 is stratified due to different component specific gravities. The control module automatically controls the liquid levels in the first and second solution tanks, so that the carbon capture solution concentrated in the upper or lower layer of the C-containing solution flows from the second solution tank 109 into the first solution tank 110, enabling the carbon capture solution (strong base) to be fully utilized.

[0038] As Figure 7 , Figure 8 As shown, the heat and moisture exchange device is composed of a heat and moisture exchange core 106 and a first heat exchanger 105 embedded therein. The first heat exchanger 105 is composed of multiple layers of capillaries arranged vertically, and each layer of capillaries is in contact with the heat and moisture exchange core 106. The heat and moisture exchange core 106 is provided with gas-liquid channels that penetrate up and down.

[0039] Referring to Figure 4 , the specific working process of the carbon capture tower 1 of the present invention is as follows (the carbon capture solution involved is preferably NaOH): (1) Air flow: Ambient air flows through the inlet 107 into the tower body 104. When flowing upward through the heat and moisture exchange core 106 from the bottom, it contacts the carbon capture solution sprayed by the liquid distributor 103 and simultaneously contacts the first heat exchanger 105. After completing the heat and moisture exchange and the carbon capture chemical reaction, the air that is high-temperature, high-humidity and has lost CO2 through the chemical reaction flows through the baffle 102 and is driven by the exhaust device 101 and sent back into the environment again.

[0040] (2) Carbon capture solution flow: The carbon capture solution input through the liquid supply pipeline 111 enters the first solution tank 110 in a liquid supply manner, and is further transported to the liquid distributor 103 by the solution circulation pump 112 and the internal circulation pipeline 113, and then evenly sprayed onto the heat and moisture exchange core 106. It flows downward naturally through the core distribution, undergoes heat and moisture exchange with the air flowing upward through the heat and moisture exchange core, and the CO2 in the air reacts with the carbon capture chemical components in the solution to generate a carbonate solution, and further flows out of the core downward. The solution containing carbonate flowing out of the core flows downward to both sides (or all four directions) through the liquid guide plate 108 and enters the second solution tank 109.

[0041] The carbon-containing solution will be stratified in the solution tank 109 due to density reasons: (2-1) If the carbonate solution has a high specific gravity, the lower concentrated solution will be discharged through the carbonaceous solution discharge pipe 114 and enter the subsequent chemical process. The upper dilute solution / water will flow over the solution tank partition 115 and enter the first solution tank 110, where it will mix with the remaining carbon capture solution and continue to be distributed to the heat and moisture exchange core 106 through the solution pump 112, internal circulation pipeline 113, and liquid distributor 103.

[0042] (2-2) If the carbonate solution has a low specific gravity, the lower carbon capture solution will flow through siphon 115 into carbon capture solution tank 110, where it will mix with the remaining carbon capture solution and continue to be distributed into heat and moisture exchange core 106 through solution pump 112, internal circulation pipeline 113, and liquid distributor 103. The remaining upper concentrated solution will be discharged through carbon solution discharge pipe 114 and enter the subsequent chemical process.

[0043] (3) Heat and moisture exchange process: When the ambient air and the spray liquid come into contact in the heat and moisture exchange core 106, the following heat and moisture and chemical exchange processes will occur: When the liquid distributor 103 flows out of a chemical component (such as NaOH) that reacts with CO2, the heat of reaction is released into the surrounding liquid and the core. The first heat exchanger 105 absorbs this heat and carries it out of the device through the fluid conduit 117. The water (H2O) flowing out of the liquid distributor 103 evaporates in the heat and moisture exchange core 106 and absorbs the surrounding heat. At this time, the circulating water in the first heat exchanger 105 is cooled and taken out of the equipment in the form of cold energy through the fluid pipe 117; The circulating water temperature in the first heat exchanger 105 is lower than the ambient dew point temperature but higher than the freezing point of the carbon capture solution. At this time, the water vapor in the air will condense in the above circulation, releasing latent heat of vaporization. This latent heat will be carried out of the equipment in the form of heat through the fluid pipeline 117.

[0044] During the operation of the carbon capture tower, the following different operating conditions may occur depending on the different choices of the circulating spray solution and the circulating medium in the heat exchange capillary network: (3-1) Carbon capture conditions: When the carbon capture solution comes into contact with the ambient air flowing through the carbon capture tower, the following heat and moisture exchange and chemical reactions occur: The chemical components in the solution react chemically with CO2 in the air to produce carbonates and generate reaction heat (chemical reaction, exothermic process); The evaporation of water in the solution absorbs the surrounding heat, cooling the air and solution (evaporation process, endothermic process); The above two phenomena partially offset each other, resulting in an overall overheating state, which has no impact on carbon capture; (3-2) Heating condition: In the above process, the reaction heat is carried away from the carbon capture tower through the medium circulation in the heat exchange capillary network to meet the heat demand of the surrounding area; further, by circulating a medium with a temperature lower than the ambient air temperature in the heat exchange capillary network, more heat can be obtained. At this time, in addition to obtaining thermal energy from the ambient air, more thermal energy can also be obtained through the condensation of water vapor in the air (condensation process, heat release process); (3-3) Cooling condition: If a water circulation spray without chemical components is adopted, a large amount of water evaporation cools the surrounding environment, and then it is carried away from the carbon capture tower through the heat exchange capillary network to achieve a cooling effect.

[0045] In practical applications, according to the cooling, heating, and carbon capture requirements of the equipment, in different seasons and different application scenarios, the corresponding operating conditions can be selected or switched among the above operating modes, and cooling capacity, heat, and CO2 can be captured simultaneously through the operation of the equipment.

[0046] Refer to Figure 5 、 Figure 6 In the carbon capture tower of the present invention, the solution diversion process after carbon capture is as follows: 1. The carbon capture solution will first be stored in the first solution tank 110, and enter the liquid distributor 103 through the solution circulation pump 112 and the internal circulation pipeline 113; 2. The carbon capture solution is sprayed into the heat and moisture exchange core 106 through the liquid distributor, and contacts the ambient air in the core and reacts with CO2 therein to generate carbonate, water, and the remaining carbon capture solution that has not participated in the reaction; 3. The above liquid leaving the heat and moisture exchange core will first drip above the liquid guide member 108 and be guided by the liquid guide member to the second solution tank 109; The liquid guide member is square conical (pyramid-shaped) or conical, and its purpose is to distribute the carbon-containing solution to the second solution tank 109 located around the bottom; The liquid guide member is two-sided slope-shaped (inverted V-shaped), and its purpose is to distribute the carbon-containing solution to the second solution tanks 109 located on both sides of the bottom; 4. Since the carbon-containing solution is mixed with the unreacted carbon capture solution and water, there is still unreacted carbon capture solution in the carbon-containing solution tank. If there is a large density difference between the carbon-containing solution and the carbon capture solution, the two solutions will show a layering phenomenon, which can be used to distinguish the two solutions. To recover the carbon capture solution into the first solution tank 110, the following methods can be selected according to the density difference and layering phenomenon to distinguish: If the density of the carbon capture solution is lower than that of the carbon-containing solution, the characteristic that it floats above the solution tank 109 can be utilized, and the low-density carbon capture solution can be made to overflow the partition 115 through a partition 115 with an appropriate height of the solution tank and enter the first solution tank 110; If the density of the carbon capture solution is higher than that of the carbon-containing solution, a siphon water pipe installed between the two solution tanks can be used to discharge the concentrated solution at the bottom in the second solution tank 109 into the carbon capture solution tank 110 when the liquid level in the second solution tank 109 is higher than that in the first solution tank 110; 5. The solution in the carbon capture solution tank 110 will be maintained at no less than the set liquid level by a liquid level monitor, and newly prepared (regenerated) concentrated solution will be replenished through the liquid replenishment pipeline 111; 6. The solution in the carbon-containing solution tank 109 will also be maintained at a liquid level by a liquid level monitor, and the carbon-containing solution will be discharged from the second solution tank 109 through the discharge pipe 114.

[0047] This Embodiment 1 also provides a carbon capture method for a DCA system integration device, which is characterized by including the following operation steps: S1. Capture carbon dioxide in the air in the carbon capture tower: The carbon capture solution storage tank 8 transports the carbon capture solution (NaOH) to the first solution tank 110 in the carbon capture tower 1. The carbon capture solution (NaOH) stored in the first solution tank 110 is pumped to the liquid distributor 103 through the internal circulation pipeline 113. When the downwardly sprayed carbon capture solution (NaOH) flows through the heat and humidity exchange device, after absorbing CO2 in the upward flowing air, the generated carbon-containing solution is all introduced into the second solution tank 109 by the liquid guiding member 108; the carbon-containing solution is composed of carbonate solution (Na2CO3) and carbon capture solution (NaOH). The automatic control module controls the liquid levels in the first and second solution tanks, so that the carbon capture solution (NaOH) concentrated in the upper or lower layer of the carbon-containing solution flows from the second solution tank 109 into the first solution tank 110; S2. Mineralize the captured carbon dioxide: The carbon-containing solution in the second solution tank 109 and the dilute solution of the flocculant (CaCl2) in the dilute flocculant solution storage tank 9 are added to the flocculation reaction tank 3. The two solutions undergo a flocculation reaction in the flocculation reaction tank 3 to generate flocculated carbonate (CaCO3) and the first intermediate reactant (NaCl) solution. The first intermediate reactant (NaCl) solution is transported to the first intermediate reactant solution storage tank 17 for storage. The flocculated carbonate (CaCO3) is transported to the solid-liquid separation device 4. After solid-liquid separation, the separated liquid is transported through a pipeline to the water storage tank 14 for storage, and the dehydrated carbonate (CaCO3) is discharged to the mineral container 18 for storage, realizing the recovery of the captured carbon dioxide in the form of mineralized substances.

[0048] Embodiment 2 As Figure 2 shown, a DAC system integration device provided in this Embodiment 2 further adds a carbon capture solution regeneration module, a hydration reaction module, and a pure CO2 acquisition module on the basis of Example 1; The carbon capture solution regeneration module includes an electrolytic cell 5. The feed inlets of the electrolytic cell 5 are respectively connected to the outlets of a water storage tank 14 and a first intermediate reactant solution storage tank 17 through pipelines. Water and the first intermediate reactant (NaCl) solution transported into the electrolytic cell 5 undergo an electrolysis reaction to generate a carbon capture solution (NaOH), anodic electrolysis gas (hydrogen), and cathodic electrolysis gas (chlorine). The generated carbon capture solution (NaOH) is transported to a carbon capture solution storage tank 8 through a pipeline. The hydration reaction module includes a scrubbing tower 6. The upper feed inlet of the scrubbing tower 6 is connected to the outlet of the water storage tank 14 through a pipeline, and the lower feed inlet of the scrubbing tower 6 is connected to the cathodic exhaust port of the electrolytic cell 5 through a pipeline. Water and the cathodic electrolysis gas (chlorine) entering the scrubbing tower 6 from the upper and lower feed inlets of the scrubbing tower 6 undergo a hydration reaction to generate oxygen and a second intermediate reactant (HCl) solution. The second intermediate reactant (HCl) solution is transported to a second intermediate reactant solution storage tank 19 through a pipeline. The pure CO2 acquisition module includes a double decomposition reaction tank 7. The feed inlets of the double decomposition reaction tank 7 are respectively connected to the discharge outlets of a second intermediate reactant solution storage tank 19 and a mineral compound container 18 through pipelines. After the second intermediate reactant (HCl) solution and carbonate (CaCO3) are added to the double decomposition reaction tank 7, a double decomposition reaction occurs to generate a concentrated flocculant (CaCl2) solution, water, and pure CO2. The products are respectively transported to a concentrated flocculant solution storage tank 10, a water storage tank 14, and a CO2 storage tank 13 for storage.

[0049] Furthermore, a DAC system integration device provided by the present invention further includes a waste heat recovery module. The waste heat recovery module includes an absorption heat pump and corresponding fluid pipelines. Second and third heat exchangers are respectively arranged in a flocculation reaction tank 3 and a double decomposition reaction tank 7. The absorption heat pump is respectively connected to a first heat exchanger in a carbon capture tower 1, a second heat exchanger in the flocculation reaction tank 3, and a third heat exchanger in the double decomposition reaction tank 7 through fluid pipelines. The heat energy generated in the carbon capture tower 1, the flocculation reaction tank 3, and the double decomposition reaction tank 7 is transported to the absorption heat pump.

[0050] The absorption heat pump uses a flocculant (CaCl2) solution as a working medium. The concentrated solution inlet of the absorption heat pump is connected to the discharge outlet of the concentrated flocculant solution storage tank 10, and the dilute solution outlet of the absorption heat pump is connected to the feed inlet of a dilute flocculant solution storage tank 9. The concentrated flocculant (CaCl2) solution provided by the concentrated flocculant solution storage tank 10 enters the absorber of the absorption heat pump, absorbs refrigerant water, and then generates a dilute flocculant (CaCl2) solution, which is stored in the dilute flocculant solution storage tank 9 and then transported to the flocculation reaction tank 3 to participate in the flocculation reaction. The concentrated flocculant (CaCl2) solution is regenerated in the double decomposition reaction tank 7 and stored in the concentrated flocculant solution storage tank 10, realizing the regeneration and recycling of the flocculant (CaCl2).

[0051] A DAC system integration device provided by the present invention automatically controls the operation of a carbon capture module, a mineralization treatment module, a carbon capture solution regeneration module, a hydration reaction module, a pure CO2 acquisition module, and a waste heat recovery module by a control module.

[0052] Embodiment 2 of the present invention provides a carbon capture method for a DCA system integration device, which is characterized in that, in addition to steps S1 and S2 provided in Embodiment 1, the following operating steps are further included: S3. Carbon capture solution regeneration: The water stored in the water storage tank 14 and the first intermediate reactant solution (NaCl) stored in the first intermediate reactant solution storage tank 17 are transported into the electrolytic cell 5 for electrolytic reaction to generate a carbon capture solution (NaOH), an anodic electrolytic gas (hydrogen), and a cathodic electrolytic gas (chlorine). The generated carbon capture solution (NaOH) is transported through a pipeline to the carbon capture solution storage tank 8 and continues to be used for carbon capture reaction; S4. Perform hydration reaction: The water storage tank 14 and the electrolytic cell 5 respectively transport water and the cathodic electrolytic gas (chlorine) to the scrubber 6. The water added from the upper end of the scrubber 6 and the cathodic electrolytic gas (chlorine) added from the lower end of the scrubber 6 undergo a hydration reaction in the scrubber 6 to generate oxygen (O2) and a second intermediate reactant (HCl) solution. The products are respectively transported to the oxygen storage tank 12 and the second intermediate reactant solution storage tank 19; S5. Obtain pure CO2: The second intermediate reactant (HCl) solution generated in the scrubber 6 and the carbonate (CaCO3) dehydrated by a solid-liquid separation device are transported into the double decomposition reaction tank 7. The second intermediate reactant (HCl) solution and the carbonate (CaCO3) undergo a double decomposition reaction in the double decomposition reaction tank 7 to generate a concentrated flocculant (CaCl2) solution, water, and pure CO2. The products are respectively transported through pipelines to the concentrated flocculant solution storage tank 10, the water storage tank 14, and the CO2 storage tank 13 for storage. The generated pure CO2 is the result of air carbon capture.

[0053] The concentrated flocculant solution storage tank 10 and the dilute flocculant solution storage tank 9 are connected by a pipeline. The concentrated flocculant solution storage tank 10 replenishes the dilute flocculant solution storage tank 9 with a flocculant (chloride) solution to achieve the reuse of the flocculant (chloride) solution.

[0054] Alternatively, the discharge port of the flocculant concentrated solution storage tank 10 is connected to the concentrated solution inlet of the absorption heat pump, and the dilute solution outlet of the absorption heat pump is connected to the feed inlet of the flocculant dilute solution storage tank 9. The concentrated solution of the flocculant (CaCl2) serves as the working medium of the absorption heat pump. The concentrated solution of the flocculant (CaCl2) provided by the flocculant concentrated solution storage tank 10 enters the absorption heat pump. After absorbing the cooling agent, a dilute solution of the flocculant (CaCl2) is generated and stored in the flocculant dilute solution storage tank 9, and then transported to the flocculation reaction tank 3 to participate in the flocculation reaction; the concentrated solution of the flocculant (CaCl2) is regenerated in the double decomposition reaction tank 7 and stored in the flocculant concentrated solution storage tank 10, realizing the regeneration and recycling of the flocculant (CaCl2).

[0055] The CO2 generated in the double decomposition reaction tank 7 is the result of carbon capture and can be used as a pure carbon dioxide product, or buried or used for enhanced oil recovery through professional means to complete the subsequent treatment of carbon capture.

[0056] In the above step S4, for the hydration reaction occurring in the scrubbing tower 6, light is used to promote hydration. The light source is natural light, or an artificial light source driven by photovoltaic is set in the scrubbing tower 6 to provide light energy for the hydration reaction.

[0057] As a buffer for each link of the system, the first intermediate reactant solution storage tank 17 can store and supplement the chloride (NaCl) solution, and the water storage tank 14 can adjust the total water volume in the system by adding and draining water.

[0058] The hydrogen (H2) generated at the anode 5 of the electrolytic cell and the oxygen (O2) produced in the scrubbing tower 6 are both by-products, which are collected by the anode electrolytic gas storage tank 11 and the oxygen storage tank 12 respectively and can be used for sales or other purposes. Among them, hydrogen can be used to supply fuel cell power generation to provide the energy required for the electrolysis process (step S3) or other solution transfer pumps (such as 112).

[0059] The electrolytic cell can use ion exchange membrane technology; the electrolytic cell is driven by a solar photovoltaic cell device.

[0060] In the specific implementation and application of Embodiments 1 and 2 provided by the present invention, preferably, the carbon capture tower 1 uses an existing cooling tower for heat exchange in an air conditioning system or a manufacturing temperature control system, and only needs to be adaptively modified inside. Similarly, the carbon capture tower 1 (carbon capture container) provided by the DAC system integration device of the present invention can also be used as the cooling tower of a newly installed air conditioning system or a manufacturing temperature control system. Connect the water inlet a and the water outlet b of the first heat exchanger 105 in the carbon capture tower 1 (carbon capture container) of the present invention to the cooling water of the air conditioning system or the manufacturing temperature control system to release heat to the circulating air (summer condition) or obtain the heat generated during the carbon capture process (winter).

[0061] The second and third heat exchangers are respectively arranged in the flocculation reaction tank 3 and the metathesis reaction tank 7. The heat energy generated during the chemical reactions occurring in the flocculation reaction tank 3 and the metathesis reaction tank is output outward after being replaced by the second and third heat exchangers to cool down the reaction process. The reaction heat can be converted into high-level heat energy by an absorption heat pump to provide heat sources for the air conditioning system or the temperature control system in the manufacturing industry, or sent to the building hot water system for use as domestic hot water or heating heat source, adding new performance to the DAC system.

[0062] The DAC system integration device provided by the present invention can also be provided with solar photovoltaic cell devices, storage batteries, voltage regulating devices, and corresponding control devices as needed, which will not be specifically described herein.

Claims

1. A DAC system integration device, characterized in that, It includes a carbon capture module, a mineralization treatment module, and an automatic control module; The carbon capture module includes a carbon capture tower (1) and an external carbon capture solution storage tank (8); an air inlet is provided in the middle and lower part of the tower body of the carbon capture tower, an air outlet and an exhaust device are provided at the top of the tower body, and a liquid distributor (103), a heat and humidity exchange device, a liquid guiding member (108), and a bottom solution tank are arranged at intervals from top to bottom in the tower body; the heat and humidity exchange device is composed of a heat and humidity exchange core 106 and a first heat exchanger 105 embedded therein, the bottom solution tank is composed of a first solution tank (110) in the middle and second solution tanks (109) on both sides or around the first solution tank, and the liquid guiding member (108) covers the first solution tank (110); The carbon capture solution storage tank (8) transports the carbon capture solution (strong base) to the first solution tank 110 through a pipeline. The carbon capture solution (strong base) in the first solution tank (110) is pumped to the liquid distributor (103) through an internal circulation pipeline. When the downwardly sprayed carbon capture solution (strong base) flows through the heat and humidity exchange device, it absorbs CO2 in the upward flowing air, and the generated C-containing solution is all introduced into the second solution tank (109) by the liquid guiding member (108); The mineralization treatment module includes a flocculation reaction tank (3) and a solid-liquid separation device (4); two feed ports are provided in the upper part of the flocculation reaction tank (3), which are respectively connected to the discharge ports of the second solution tank (109) and the flocculant dilute solution storage tank (9) through pipelines. The C-containing solution and the flocculant (chloride) dilute solution transported into the flocculation reaction tank (3) undergo a flocculation reaction to generate flocculated carbonate and a first intermediate reactant solution; Two discharge ports are provided in the lower part of the flocculation reaction tank (3), which are respectively connected to the solid-liquid separation device (4) and the feed port of the first intermediate reactant solution storage tank (17) through pipelines; the generated first intermediate reactant solution is transported to the first intermediate reactant solution storage tank (17), the generated flocculated carbonate is transported to the solid-liquid separation device (4), after solid-liquid separation, the separated water is transported to the water storage tank (14), and the dehydrated carbonate is discharged to the mineral container (18) for storage.

2. The integrated device of a DAC system according to claim 1, characterized in that It also includes a carbon capture solution regeneration module, a hydration reaction module, and a pure CO2 acquisition module; The carbon capture solution regeneration module includes an electrolytic cell (5), and the feed ports of the electrolytic cell (5) are respectively connected to the discharge ports of the water storage tank (14) and the first intermediate reactant solution storage tank (17) through pipelines. The water and the first intermediate reactant solution transported into the electrolytic cell (5) undergo an electrolytic reaction to generate a carbon capture solution (strong base), anodic electrolytic gas (H2), and cathodic electrolytic gas (CL2). The generated carbon capture solution (strong base) is transported to the carbon capture solution storage tank (8) through a pipeline; The hydration reaction module includes a scrubbing tower (6). The upper feed inlet of the scrubbing tower (6) is connected to the discharge outlet of a water storage tank (14) through a pipeline. The lower feed inlet of the scrubbing tower (6) is connected to the cathode exhaust port of an electrolytic cell (5) through a pipeline. Water and cathode electrolytic gas (CL2) entering the scrubbing tower (6) from the upper and lower feed inlets of the scrubbing tower undergo a hydration reaction, and the resulting second intermediate reactant (HCL) solution is transported to a second intermediate reactant solution storage tank (19) through a pipeline. The pure CO2 acquisition module includes a metathesis reaction tank (7). The feed inlets of the metathesis reaction tank (7) are respectively connected to the discharge outlets of a second intermediate reactant solution storage tank (19) and a mineralizer container (18) through pipelines. The second intermediate reactant (HCL) solution and carbonate added into the metathesis reaction tank (7) undergo a metathesis reaction to generate a concentrated solution of a flocculant (chloride), water, and pure CO2. The products are respectively transported to a concentrated flocculant solution storage tank (10), a water storage tank (14), and a CO2 storage tank 13 for storage through pipelines.

3. A DAC system integration device according to claim 2, characterized in that, It further includes a waste heat recovery module. The waste heat recovery module includes an absorption heat pump and corresponding fluid pipelines. Second and third heat exchangers are respectively arranged in a flocculation reaction tank (3) and a metathesis reaction tank (7). The absorption heat pump is respectively connected to a first heat exchanger in a carbon capture tower (1), a second heat exchanger in the flocculation reaction tank (3), and a third heat exchanger in the metathesis reaction tank (7) through fluid pipelines. The heat energy generated in the carbon capture tower, the flocculation reaction tank, and the metathesis reaction tank is transported to the absorption heat pump.

4. A DAC system integration device according to claim 2, characterized in that, The concentrated solution inlet of the absorption heat pump is connected to the discharge outlet of a concentrated flocculant solution storage tank (10), and the dilute solution outlet of the absorption heat pump is connected to the feed inlet of a dilute flocculant solution storage tank (9). The absorption heat pump uses a concentrated solution of a flocculant (chloride) as a working medium. The concentrated solution of the flocculant (chloride) enters the absorption heat pump to absorb refrigerant water, and the resulting dilute solution of the flocculant (chloride) is stored in the dilute flocculant solution storage tank (9).

5. A DAC system integration device according to claim 1, characterized in that, The heat and moisture exchange device is composed of a heat and moisture exchange core (106) and a first heat exchanger (105) embedded therein. The first heat exchanger is composed of multiple layers of capillaries arranged vertically, and each layer of capillaries is attached to the heat and moisture exchange core. The heat and moisture exchange core is provided with gas-liquid channels that penetrate up and down.

6. A DAC system integration device according to claim 1, characterized in that, When the second solution tank (109) is located on both sides of the first solution tank (110), the liquid guiding member (108) is an inverted V-shaped structure with two liquid guiding planes; when the second solution tank (109) is located around the first solution tank (110), the liquid guiding member (108) is a conical structure. A siphon tube is arranged between the first and second solution tanks, and a solution channel is arranged at the upper parts of the two solution tanks. The control module automatically controls the liquid levels in the first and second solution tanks, so that the bottom solution of the second solution tank (109) flows into the first solution tank (110) through the siphon tube, or the upper solution of the second solution tank (109) flows into the first solution tank (110) through the solution channel.

7. A carbon capture method for a DCA system integration device, characterized in that, It includes the following operating steps: S1. Capture carbon dioxide in the air in the carbon capture tower: The carbon capture solution storage tank (8) transports the carbon capture solution (strong base) to the first solution tank (110) inside the carbon capture tower. The carbon capture solution (strong base) stored in the first solution tank (110) is pumped to the liquid distributor (103) through the internal circulation pipeline. When the downward-sprayed carbon capture solution (strong base) flows through the heat and humidity exchange device and absorbs CO2 in the upward-flowing air, the generated C-containing solution is all introduced into the second solution tank 109 by the liquid guiding member 108; The C-containing solution is composed of a carbonate solution and a carbon capture solution (strong base). The automatic control module controls the liquid levels in the first and second solution tanks, enabling the carbon capture solution concentrated in the upper or lower layer of the C-containing solution to flow from the second solution tank 109 into the first solution tank 110; S2. Mineralization treatment of the captured carbon dioxide: The C-containing solution in the second solution tank (109) and the dilute solution of the flocculant (chloride) in the flocculant dilute solution storage tank (9) are transported to the flocculation reaction tank (3). The C-containing solution and the dilute solution of the flocculant (chloride) undergo a flocculation reaction to generate flocculated carbonate and a first intermediate reactant solution. The generated first intermediate reactant solution is transported to the first intermediate reactant solution storage tank (17) for storage, and the generated flocculated carbonate is transported to the solid-liquid separation device (4). After solid-liquid separation, the separated water is transported to the water storage tank (14) for storage, and the dehydrated carbonate is discharged to the mineralized material container (18) for storage.

8. A carbon capture method for a DCA system integration device according to claim 6, characterized in that, In addition to the operation steps S1 and S2, the following operation steps are also included: S3. Regeneration of the carbon capture solution: The water and the first intermediate reactant solution stored in the water storage tank (14) and the first intermediate reactant solution storage tank (17) are transported into the electrolytic cell (5) for electrolysis reaction, generating a carbon capture solution (strong base), anodic electrolysis gas (H2), and cathodic electrolysis gas (CL2). The generated carbon capture solution (strong base) is transported to the carbon capture solution storage tank (8) through a pipeline and continues to be used for carbon capture reaction; S4. Carry out a hydration reaction: The water storage tank (14) and the electrolytic cell (5) respectively transport water and cathodic electrolysis gas (CL2) to the scrubber (6). The water added from the upper end of the scrubber and the cathodic electrolysis gas (CL2) added from the lower end of the scrubber undergo a hydration reaction in the scrubber (6), and the generated second intermediate reactant (HCL) solution is transported to the second intermediate reactant solution storage tank (19) through a pipeline; S5. Obtain pure CO2: The second intermediate reactant (HCL) solution generated in the scrubber 6 and the carbonate dehydrated by the solid-liquid separation device are transported into the double decomposition reaction tank (7). The second intermediate reactant (HCL) solution and the carbonate undergo a double decomposition reaction in the double decomposition reaction tank (7), generating a concentrated solution of the flocculant (chloride), water, and pure CO2. The products are respectively transported to the concentrated flocculant solution storage tank (10), the water storage tank (14), and the CO2 storage tank (13) for storage. The generated pure CO2 is the result of air carbon capture.

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