A direct air mineralization system and method

Abstract

The application relates to the field of carbon dioxide emission reduction technology, in particular to a direct air mineralization system and method, which comprises an air control device and a CO2 absorption mineralization device, wherein the air control device is used for adjusting the flow direction and flow rate of air entering the CO2 absorption mineralization device, and the CO2 absorption mineralization device is used for the reaction of CO2 in the air and mineralization raw materials. The system can effectively adjust the flow direction and flow rate of the air about to react with the mineralization raw materials, thereby realizing the full use of natural wind and avoiding the high energy consumption problem caused by using a mechanical fan to guide the wind. Meanwhile, a plurality of rotatable raw material spreading plates are arranged in a staggered manner from top to bottom, the automatic and controllable feeding and discharging of the mineralization raw materials are realized, the surface of the material can be continuously updated in the moving process of the mineralization raw materials, the residence time of the raw materials can be controlled in real time, the effective contact area of the air and the mineralization raw materials is increased, and the conversion rate of CO2 and the utilization rate of the mineralization raw materials are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide emission reduction, and in particular to a direct air mineralization system and method. Background Art

[0002] Excessive carbon dioxide (CO2) emissions have become a serious global challenge. As a major greenhouse gas, rising atmospheric concentrations of CO2 are a key factor in global warming. This climate change has profound impacts on Earth's ecosystems, including increased extreme weather events, rising sea levels, biodiversity loss, and unstable crop yields.

[0003] Mineralization in CCUS carbon capture and utilization technology refers to the process of reacting CO2 with ores and solid waste containing alkaline and alkaline earth metal oxides (primarily calcium magnesium silicate ores) to produce carbonates. Related industrial practices have already begun. Direct Air Capture (DAC) technology is an innovative approach to addressing climate change. It involves using specific adsorbent materials to directly remove carbon dioxide from the atmosphere and separating the CO2 from the adsorbent material by heating or reducing pressure for compression and storage or utilization. Although DAC technology is conceptually attractive and can be implemented anywhere without relying on a specific type of power plant or industrial emission source, it still faces the challenges of high cost and high energy consumption.

[0004] Direct Air Mineralization (DAM) combines DAC technology with CO2 from the air and natural or artificially accelerated mineralization processes to convert captured CO2 into stable mineral forms, such as carbonates. This method not only provides a long-term and safe means of carbon sequestration, but also has the potential to provide additional economic incentives, and the resulting mineralized products have certain commercial value.

[0005] Chinese invention patent CN117839419A discloses a mineralization system for directly mineralizing CO2 in air. The system comprises: an absorption mineralization reactor for reacting CO2 in air with a mineralizing feedstock to form carbonates, and then discharging a first CO2-depleted air; a humidity control system for regulating the humidity of air entering the absorption mineralization reactor, thereby controlling the absolute humidity of the first CO2-depleted air after decarbonization; and a mineralizing feedstock delivery system for supplying the mineralizing feedstock to the absorption mineralization reactor and reacting the delivered mineralizing feedstock with the CO2 in the first CO2-depleted air to further form carbonates. This system utilizes a cascaded CO2 absorption process, achieving a high CO2 absorption rate. It also fully utilizes wet decarbonized air to facilitate the delivery of mineralizing feedstock and humidify fresh mineralizing feedstock, reducing atomization water consumption. While this system can directly mineralize CO2 in air into a stable carbonate structure, achieving stable carbon sequestration from the air, it cannot utilize natural wind; air must be drawn by a mechanical fan before entering the absorption mineralization reactor, resulting in high energy consumption.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The object of the present invention is to provide a direct air mineralization system and method, which promotes the conversion of CO2 in the air, improves the conversion rate of CO2 and the utilization rate of mineralization raw materials.

[0008] In a first aspect, the present invention provides a direct air mineralization system, comprising an air control device and a CO2 absorption mineralization device, wherein the CO2 absorption mineralization device is independently rotatably disposed inside the air control device;

[0009] Wherein, the air control device is used to adjust the flow direction and flow rate of the air entering the CO2 absorption mineralization device;

[0010] The interior of the CO2 absorption and mineralization device is staggered with multiple rotatable raw material spreading plates from top to bottom, and the CO2 in the air reacts with the mineralized raw materials on the raw material spreading plates to generate carbonate.

[0011] As a preferred embodiment of the present technical solution, the air control device includes a first frame and angle-adjustable louvers, the first frame includes at least three side surfaces, and each side surface of the first frame is provided with the angle-adjustable louvers.

[0012] As a preferred embodiment of this technical solution, the angle-adjustable louvers include an upper beam, a plurality of blades arranged in parallel from top to bottom below the upper beam, and a blade angle adjustment unit, which is disposed on the upper beam and is used to adjust the blade angle. The blade opening range is 0-180°. The angle-adjustable louvers can effectively regulate the speed and volume of air entering the CO2 absorption and mineralization device, significantly improving the stability and efficiency of the mineralization reaction.

[0013] As a preferred embodiment of the present technical solution, the CO2 absorption and mineralization device further includes a second frame and a rotation adjustment portion, and all the raw material spreading plates are rotatably connected to the second frame via the rotation adjustment portion.

[0014] As a preferred embodiment of the present technical solution, a rotating turntable is provided at the bottom of the CO2 absorption and mineralization device, and the rotating turntable is used to drive the second frame to drive the raw material spreading plate to rotate along the axial direction of the second frame.

[0015] As a preferred embodiment of the present technical solution, a feed port is provided above the second frame, and a discharge port is provided below the second frame.

[0016] As a preferred embodiment of this technical solution, to prevent the mineralized material on the raw material spreading board from spilling from both sides of the raw material spreading board, a shielding net can be installed on both sides of the raw material spreading board to achieve the effect of air permeability but material impermeability. The specific aperture of the shielding net can be selected according to the particle size of the mineral material.

[0017] In a second aspect, the present invention further provides a method for fixing CO2 in the above-mentioned direct air mineralization system, which should also fall within the scope of protection of the present invention. The method specifically comprises the following steps:

[0018] The mineralized raw materials enter the CO2 absorption mineralization device through the feed inlet and fall step by step from the first raw material spreading plate to the last raw material spreading plate;

[0019] Air enters the CO2 absorption and mineralization device through the angle-adjustable blades and reacts with the mineralized raw materials to generate carbonates;

[0020] Among them, by rotating the CO2 absorption and mineralization device, the material placement surface of the raw material spreading plate faces the air flow direction, and by adjusting the inclination angle of the raw material spreading plate, the descending speed of the material on the raw material spreading plate is controlled. By adjusting the angle, the opening of the leaf window can be adjusted to adjust the angle between the air flow direction and the raw material spreading plate.

[0021] As a preferred embodiment of this technical solution, the flow rate of the air is 0.5-5m / s.

[0022] As a preferred embodiment of the present technical solution, the angle between the plane where the air flows and the raw material spreading plate is 45-90°.

[0023] As a preferred embodiment of this technical solution, the particle size of the mineralized raw material is 0.05-2 cm.

[0024] The direct air mineralization system of the present invention has at least the following beneficial effects:

[0025] 1. The direct air mineralization system of the present invention includes an air control device and a CO2 absorption mineralization device independently rotatably arranged inside the air control device, wherein the air control device is used to adjust the flow direction and flow rate of air entering the CO2 absorption mineralization device, and the CO2 absorption mineralization device is used to react CO2 in the air with the mineralized raw materials to form carbonates. Through the setting of the air control device, the system can effectively adjust the flow direction and flow rate of the air that is about to react with the mineralized raw materials, thereby fully utilizing natural wind and avoiding the high energy consumption problem caused by the use of mechanical fans to induce wind. At the same time, multiple rotatable raw material spreading plates are staggered from top to bottom, realizing automatic and controllable feeding and discharging of solid mineralized raw materials. At the same time, the surface of the material can be continuously updated during the movement of the mineralized raw materials, and the residence time of the raw materials can be controlled in real time, thereby increasing the effective contact area between the air and the mineralized raw materials, facilitating the full contact between the mineralized raw materials and the air and generating stable carbonates, thereby promoting the conversion of CO2 in the air and improving the conversion rate of CO2 and the utilization rate of the mineralized raw materials.

[0026] 2. The direct air mineralization system of the present invention has a simple structure, an easily controllable operation process, and is convenient for engineering scale-up and industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic structural diagram of the direct air mineralization system of the present invention;

[0029] Figure 2 This is a cross-sectional view of the CO2 absorption and mineralization device of the present invention;

[0030] Figure 3 A top view of the CO2 absorption and mineralization device of the present invention;

[0031] Figure 4 A bottom view of the CO2 absorption and mineralization device of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the air control device of the present invention.

[0033] Description of reference numerals:

[0034] 1: Air control device; 2: CO2 absorption and mineralization device; 3: Raw material spreading plate; 4: First frame; 5: Blades; 6: Blade angle adjustment unit; 7: Second frame; 8: Rotating turntable; 9: Feed inlet; 10: Discharge outlet. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular also includes the plural. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1

[0039] This embodiment provides a direct air mineralization system, including an air control device 1 and a CO2 absorption mineralization device 2, wherein the CO2 absorption mineralization device 2 is independently rotatably arranged inside the air control device 1; wherein the air control device 1 is used to adjust the flow direction and flow rate of air entering the CO2 absorption mineralization device 2; the interior of the CO2 absorption mineralization device 2 is staggered from top to bottom with multiple rotatable raw material spreading plates 3, and the CO2 in the air reacts with the mineralized raw materials on the raw material spreading plates 3 to generate carbonates.

[0040] The direct air mineralization system in this embodiment includes an air control device 1 and a CO2 absorption mineralization device 2 that is independently rotatably arranged inside the air control device 1, wherein the air control device 1 is used to adjust the flow direction and flow rate of air entering the CO2 absorption mineralization device 2, and the CO2 absorption mineralization device 2 is rotatably arranged inside the air control device 1. When in use, the direction of the CO2 absorption mineralization device 2 can be adjusted according to the flow direction of the air so that the mineralized raw materials on the raw material spreading plate 3 in the CO2 absorption mineralization device 2 face the air flow direction, thereby increasing the contact area between the mineralized raw materials and the air.

[0041] Therefore, the system can effectively adjust the flow direction, flow rate and flow of the air that is about to react with the mineralized raw materials through the setting of the air control device 1, thereby realizing the full utilization of natural wind and avoiding the high energy consumption problem caused by the use of mechanical fans to induce wind; at the same time, multiple rotatable raw material spreading plates 3 are staggered from top to bottom, realizing the automatic and controllable feeding and discharging of solid mineralized raw materials. At the same time, the surface of the material can be continuously updated during the movement of the mineralized raw materials, and the residence time of the raw materials can be controlled in real time, thereby increasing the effective contact area between the air and the mineralized raw materials, facilitating the full contact between the mineralized raw materials and the air and generating stable carbonates, thereby promoting the conversion of CO2 in the air, and improving the conversion rate of CO2 and the utilization rate of the mineralized raw materials.

[0042] In this embodiment, the air control device 1 includes a first frame 4 and angle-adjustable louvers. The first frame 4 includes at least three side surfaces, each of which is provided with the angle-adjustable louvers. After the air passes through the angle-adjustable louvers and has its direction, velocity, and flow rate adjusted, it enters the CO2 absorption and mineralization device 2, where it reacts with the mineralized raw materials on the raw material spreading plate 3 to form carbonates. The angle-adjustable louvers fully utilize natural wind and avoid the high energy consumption associated with using mechanical fans to induce air.

[0043] Based on the above technical solution, it is further preferred that the angle-adjustable louver include an upper beam, a plurality of blades 5 arranged in parallel from top to bottom below the upper beam, and a blade angle adjustment unit 6. The blade angle adjustment unit 6 is disposed on the upper beam and is used to adjust the inclination angle of the blades 5. The blade angle adjustment unit 6 can adjust the direction, velocity, and volume of air flow by adjusting the inclination angle of each blade 5. The arrangement of the upper beam, the plurality of blades 5, and the blade angle adjustment unit 6 can refer to the structure of a Venetian blind in the prior art, wherein the blade angle adjustment unit 6 can be a pull cord or a rotating rod. In addition, to improve the structural stability of the angle-adjustable louver and prevent excessive natural wind from affecting the stability of the blade 5 angle adjustment, a frame can be provided around the blades 5.

[0044] In this embodiment, the CO2 absorption and mineralization device 2 further includes a second frame 7 and a rotation adjustment unit. The raw material spreading plates 3 are staggered and arranged on the second frame 7 from top to bottom, and all of the raw material spreading plates 3 are rotationally connected to the second frame 7 via the rotation adjustment unit. The rotation adjustment unit can be used to drive all of the raw material spreading plates 3 to rotate. On the one hand, the tilt angle of the raw material spreading plates 3 must take into account the automated spreading process of the mineralized raw materials on the raw material spreading plates 3, as well as the thickness adjustment of the materials to achieve continuous production. On the other hand, after the angle of the raw material spreading plates 3 is adjusted, the tilt angle of the blades 5 on the louvers can be adjusted by adjusting the angle, thereby adjusting the air flow direction, and then adjusting the angle between the air flow direction and the raw material spreading plates 3, so as to facilitate full contact between the mineralized raw materials and the air and generate stable carbonates.

[0045] Specifically, the rotation adjustment unit includes a rotation control mechanism, a linkage mechanism, a control mechanism, and a control source. The rotation control mechanism includes a shaft, a motor, a main shaft, a drive shaft, and a drive rod. The shaft serves as the central axis of rotation, around which the other components rotate. The motor is connected to one end of the shaft, providing power for rotation. The main shaft is sleeved onto the shaft through an axial hole and externally fixedly connected to the raw material spreading plate 3. The drive shaft and drive rod interact with the shaft and main shaft, controlling the rotation and stopping of the raw material spreading plate 3 through springs and guide grooves. The linkage mechanism includes couplings, gears, and bearings. The couplings are used to connect different main shafts to achieve simultaneous rotation and are the core components of the linkage mechanism. The gears convert the rotation of one shaft into the rotation of another. The bearings, as key components supporting the shafts, ensure smooth rotation. The control mechanism includes a controller and sensors. The controller is used to send commands and unify the rotational state of the control device, including manual and automatic control functions. The sensors monitor information such as the rotational state and position and provide feedback to the controller for precise control. The control source includes a battery or power supply to provide power to the motor or electric motor.

[0046] Based on the above technical solution, it is further preferred that the CO2 absorption and mineralization device 2 is independently rotatably disposed within the air control device 1. This rotation can be achieved by providing a rotating turntable 8 at the bottom of the CO2 absorption and mineralization device 2. The rotating turntable 8 can be used to drive the second frame 7 to drive the raw material spreading plate 3 to rotate along the axial direction of the second frame 7. The CO2 absorption and mineralization device 2 is rotated by rotating the turntable 8 so that the material placement surface of the raw material spreading plate 3 faces the direction of air flow.

[0047] Specifically, the rotating turntable 8 can be designed with reference to the existing technology, for example, it includes a base, bearings, a turntable, a drive device, a sensor and a controller, wherein the base serves as a stable foundation for the entire rotating turntable 8, which not only bears the weight of the turntable, but also ensures the stability of the turntable during rotation; the bearing is located inside the base, and its main function is to support the turntable and reduce its friction during rotation; the turntable is connected to the base through the bearing, and can achieve smooth rotation under the action of the drive device. The size and material of the turntable are selected according to the specific application scenario to withstand the corresponding load and stress; the drive device can be a stepper motor or a servo motor, which mainly provides rotation power for the turntable; the sensor is used to detect key parameters such as the position, speed and rotation direction of the turntable; based on the feedback signal of the sensor, the controller can accurately adjust the speed and direction of the drive device, thereby achieving precise control of the turntable.

[0048] On the basis of the above technical solution, it is further preferred that a feed port 9 is provided above the second frame 7, and materials are added to the uppermost raw material spreading plate 3 through the feed port 9. A discharge port 10 is provided below the second frame 7, and finally the materials after the mineralization reaction are completed are discharged through the discharge port 10. Specifically, the discharge port 10 is provided below the lowermost raw material spreading plate 3, so that the materials after the reaction can be discharged smoothly from the discharge port 10.

[0049] Based on the above technical solution, it is further preferred that, in order to prevent the mineralized material on the raw material spreading plate 3 from spilling from the sides of the raw material spreading plate 3, shielding nets can be installed on both sides of the raw material spreading plate 3 to achieve the effect of air permeability but material impermeability. The specific aperture of the shielding net can be selected according to the particle size of the mineral material.

[0050] Example 2

[0051] This embodiment provides a method for fixing CO2 in the direct air mineralization system, which specifically includes the following steps:

[0052] The mineralized raw material enters the CO2 absorption mineralization device 2 through the feed port 9 and falls step by step from the first raw material spreading plate 3 to the last raw material spreading plate 3;

[0053] Air enters the CO2 absorption and mineralization device 2 through the angle-adjustable blades and reacts with the mineralized raw materials to form carbonates;

[0054] Among them, by rotating the CO2 absorption mineralization device 2, the material placement surface of the raw material spreading plate 3 faces the air flow direction, and by adjusting the inclination angle of the raw material spreading plate 3, the descending speed of the material on the raw material spreading plate 3 is controlled. By adjusting the angle, the opening of the leaf window can be adjusted to adjust the angle between the air flow direction and the raw material spreading plate 3.

[0055] With the angle-adjustable louvers of the present application, the air flow rate can be adjusted to 0.5-5m / s.

[0056] By adjusting the rotation angle of the rotating turntable 8, the inclination angle of the raw material spreading plate 3 and the angle-adjustable louver opening, the angle between the plane where the air flow is located and the raw material spreading plate 3 is finally adjusted to 45-90°. The air flow is blown toward the raw material spreading plate 3 at this angle, which increases the effective contact area between the air and the mineralized raw material, facilitates the full contact between the mineralized raw material and the air and generates stable carbonates, thereby promoting the conversion of CO2 in the air, and improving the conversion rate of CO2 and the utilization rate of the mineralized raw material.

[0057] In this embodiment, the particle size of the mineralized raw material is not strictly limited and can be any value between 0.05-2 cm.

[0058] Example 3

[0059] The direct air mineralization system of this embodiment includes an air control device 1 and a CO2 absorption mineralization device 2, wherein the air control device 1 includes a first frame 4 and angle-adjustable blades; the CO2 absorption mineralization device 2 includes a feed port 9, multiple raw material spreading plates 3, a rotation adjustment part, a discharge port 10 and a rotating turntable 8.

[0060] Specifically, the first frame 4 in the air control device 1 is a four-sided frame structure, 0.2m above the ground, 1m high, and 1m wide. Ten blades 5 are provided on each side of the first frame 4, with 0.1m spacing between the blades 5. The CO2 absorption and mineralization device 2 is 0.75m long, 0.55m wide, and 1m high. The feed port 9 is 0.2m from the top of the topmost raw material spreading plate 3 and 0.5m long. Five raw material spreading plates 3 are provided within the CO2 absorption and mineralization device 2, alternating left and right, with 0.2m spacing, a width of 0.55m, and a length of 0.45m. The discharge port 10 is 0.2m from the bottom of the bottommost raw material spreading plate 3 and 0.55m long. The rotating turntable 8 is located at the bottom center of the CO2 absorption and mineralization device 2 and has a circular diameter of 0.4m.

[0061] The calcic alkaline material of the present embodiment is selected carbide slag as mineralized raw material. The content of calcium oxide is 75% in the carbide slag. The particle size of the carbide slag is controlled at 100 orders. Adopting air is unstripped gas, and records CO in the unstripped gas. The volume concentration is 412ppm. The gas velocity of unstripped gas is controlled at 3.5m / s, and the flow rate of fresh carbide slag is 5kg / h. By adjusting the rotating part, making the flow velocity of the carbide slag is 2m / h.

[0062] The air flow direction was perpendicular to the plane of the first frame 4. During the experiment, air was blown into the system from four directions. By adjusting the inclination angle of the raw material spreading plate 3, the material's descent rate on the raw material spreading plate 3 was controlled to 2 m / h. The opening of the louvers was adjusted by adjusting the angle, adjusting the angle between the plane of the air flow and the raw material spreading plate 3 to 60°, and the air flow rate to 1.5 m / s. When the CO2 in the raw gas reacted with the calcium hydroxide in the carbide slag to form calcium carbonate, the carbide slag was discharged from the discharge port 10.

[0063] The mineralization capacity A of the mineralized raw material per unit time is calculated according to the following formula:

[0064]

[0065] in:

[0066] m out is the mass of CaCO3 in the exported mineralized raw materials, g;

[0067] m in is the mass of CaCO3 in the imported mineralized raw materials, g;

[0068] h is the time from import to export of mineralized raw materials, h;

[0069] is the molar mass of CO2, g / mol;

[0070] is the molar mass of CaCO3, g / mol.

[0071] Through measurement and calculation, it was found that the mineralization capacity A of the mineralized raw material per unit time was 220g / h.

[0072] In this embodiment, the ratio of calcium oxide in the mineralized raw material carbide slag converted into calcium carbonate (ie, the utilization rate of calcium) is 70%.

[0073] Example 4

[0074] This embodiment is basically the same as embodiment 3, except that when the raw gas in this embodiment enters the CO2 absorption and mineralization device 2, the angle of the blade 5 is not adjusted as the wind direction changes, so that the opening angle of the blade is controlled at 30°.

[0075] Through measurement and calculation, it was found that the mineralization capacity A of the mineralized raw material in this example per unit time was 180 g / h.

[0076] In this embodiment, the ratio of calcium oxide in the mineralized raw material carbide slag converted into calcium carbonate (ie, the utilization rate of calcium) is 58%.

[0077] Example 5

[0078] This embodiment is basically the same as embodiment 3, except that the flow rate of fresh carbide slag in this embodiment is 5 kg / h, and the flow rate of the carbide slag is set to 3 m / h by adjusting the rotating regulating part.

[0079] Through measurement and calculation, it was found that the mineralization capacity A of the mineralized raw material in this example per unit time was 192 g / h.

[0080] In this embodiment, the ratio of calcium oxide in the mineralized raw material carbide slag converted into calcium carbonate (ie, the utilization rate of calcium) is 62%.

[0081] Example 6

[0082] This embodiment is basically the same as embodiment 3, except that: in this embodiment, when the raw gas contacts the raw material spreading plate 3 through the angle-adjustable blades, the rotating turntable 8 is not adjusted as the wind direction changes, so that the direction of the CO2 absorption mineralization device 2 remains unchanged.

[0083] Through measurement and calculation, it was found that the mineralization capacity A of the mineralized raw material in this example per unit time was 157 g / h.

[0084] In this embodiment, the ratio of calcium oxide in the mineralized raw material carbide slag converted into calcium carbonate (ie, the utilization rate of calcium) is 50%.

[0085] Comparative Example 1

[0086] The raw gas (air), mineralized raw material (carbide slag), gas velocity and gas direction of the raw gas used in this control example are the same as those in Example 3. The difference is that the direct air mineralization system in Example 3 is not used in this control example. When the raw gas is in direct contact with the mineralized raw material, the flow direction, flow rate and flow rate of the air are not adjusted by the direct air mineralization system, and the surface of the mineralized raw material is not updated.

[0087] Through measurement and calculation, it was found that the mineralization capacity A of the mineralized raw material in this comparative example per unit time was 98 g / h.

[0088] The ratio of calcium oxide in the mineralized raw material carbide slag converted into calcium carbonate (i.e., the utilization rate of calcium) in this comparative example is 32%.

[0089] Comparative Example 2

[0090] This embodiment is basically the same as embodiment 3, except that in this comparative example, the angle between the plane where the air flows and the raw material spreading plate 3 is always 25°.

[0091] Through measurement and calculation, it was found that the mineralization capacity A of the mineralized raw material in this comparative example per unit time was 143 g / h.

[0092] The ratio of calcium oxide in the mineralized raw material carbide slag converted into calcium carbonate (i.e., the utilization rate of calcium) in this comparative example is 44%.

[0093] Comparative Example 3

[0094] This embodiment is basically the same as embodiment 3, except that in this comparative example, the angle between the plane where the air flows and the raw material spreading plate 3 is always 15°.

[0095] Through measurement and calculation, it was found that the mineralization capacity A of the mineralized raw material in this comparative example per unit time was 132 g / h.

[0096] The ratio of calcium oxide in the mineralized raw material carbide slag converted into calcium carbonate (i.e., the utilization rate of calcium) in this comparative example is 38%.

[0097] Table 1 is the test results of the above embodiments and comparative examples.

[0098] Table 1 Test results

[0099] Serial number Mineralization capacity A (g / h) Calcium utilization (%) Example 3 220 70 Example 4 180 58 Example 5 192 62 Example 6 157 50 Comparative Example 1 98 32 Comparative Example 2 143 44 Comparative Example 3 132 38

[0100] As can be seen from Table 1, the direct air mineralization system of the present invention greatly improves the efficiency of contact between gas and solid medium by accurately adjusting the moving speed, air flow direction, air flow rate and air speed of the mineralized raw material, so that the mineralized raw material can fully contact with CO2 in the air and directly mineralize, which not only achieves the purpose of permanently fixing CO2 in the air, but also greatly improves the mineralization efficiency. In addition, the surface of the wet alkaline solid mineralized material can be continuously updated during the entire process from entering the system to leaving the system, and its moving speed can be controlled in real time, which effectively increases the reaction contact area and contact time, and promotes the effective conversion of CO2 in the air. Therefore, under this system, the gaseous and solid phases can be fully contacted, which not only significantly improves the absorption and utilization rate of carbon dioxide and the overall processing efficiency, but also supports a continuous production process. This system and method not only provides a highly efficient technical means for solving the problem of global climate change, but also opens up new possibilities for achieving sustainable development goals.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A direct air mineralization system, characterized in that: It comprises an air control device (1) and a CO2 absorption mineralization device (2), wherein the CO2 absorption mineralization device (2) is independently rotatably arranged inside the air control device (1); Wherein, the air control device (1) is used to adjust the flow direction and flow rate of the air entering the CO2 absorption mineralization device (2); The CO2 absorption and mineralization device (2) is provided with a plurality of rotatable raw material spreading plates (3) arranged in an interlaced manner from top to bottom, and CO2 in the air reacts with the mineralized raw materials on the raw material spreading plates (3) to generate carbonate; The air control device (1) comprises a first frame (4) and an angle-adjustable louver, wherein the first frame (4) comprises at least three side surfaces, and each side surface of the first frame (4) is provided with the angle-adjustable louver; The CO2 absorption and mineralization device (2) further comprises a second frame (7) and a rotation adjustment portion, and all the raw material spreading plates (3) are rotationally connected to the second frame (7) via the rotation adjustment portion.

2. The direct air mineralization system according to claim 1, characterized in that The angle-adjustable louver comprises an upper beam, a plurality of blades (5) arranged in parallel below the upper beam from top to bottom, and a blade angle adjustment portion (6); the blade angle adjustment portion (6) is arranged on the upper beam and is used to adjust the inclination angle of the blade (5).

3. The direct air mineralization system according to claim 1, characterized in that A rotating turntable (8) is provided at the bottom of the CO2 absorption mineralization device (2), and the rotating turntable (8) is used to drive the second frame (7) to drive the raw material spreading plate (3) to rotate along the axial direction of the second frame (7).

4. The direct air mineralization system according to claim 1, characterized in that The top of the second frame (7) is provided with a feed port (9), and the bottom of the second frame (7) is provided with a discharge port (10).

5. The method for fixing CO2 by a direct air mineralization system according to any one of claims 1 to 4, characterized in that: The following steps are involved: The mineralized raw material enters the CO2 absorption mineralization device (2) through the feed port (9) and falls step by step from the first raw material spreading plate (3) to the last raw material spreading plate (3); Air enters the CO2 absorption and mineralization device (2) through the angle-adjustable blades and reacts with the mineralized raw materials to generate carbonates; The CO2 absorption and mineralization device (2) is rotated so that the material placement surface of the raw material spreading plate (3) faces the direction of air flow. The descending speed of the material on the raw material spreading plate (3) is controlled by adjusting the inclination angle of the raw material spreading plate (3). The opening of the leaf window can be adjusted by adjusting the angle, thereby adjusting the angle between the air flow direction and the raw material spreading plate (3).

6. The method for fixing CO2 according to claim 5, characterized in that The flow rate of the air is 0.5-5 m / s.

7. The method for fixing CO2 according to claim 5, characterized in that The angle between the plane where the air flows and the raw material spreading plate (3) is 45-90 degrees.

8. The method for fixing CO2 according to claim 5, characterized in that The particle size of the mineralized raw material is 0.05-2 cm.

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