Pocket type system and method for mineralizing carbon dioxide in air

Abstract

The invention relates to the technical field of CO2 trapping, in particular to a pocket type system and method for mineralizing carbon dioxide in air, the pocket type system comprises one or more layers of reaction mechanisms, each reaction mechanism comprises a supporting plate, a lifting plate, a mixing part and a plurality of net bags, a plurality of holes are evenly formed in the supporting plate, and all the net bags are correspondingly hung below the holes; the lifting plate is arranged below the supporting plate in parallel, and the lifting plate can move in the direction close to or away from the supporting plate. The material mixing part is arranged above the supporting plate and is used for turning over, mixing and uniformly distributing the mineralized absorbent on the supporting plate. The downward extending three-dimensional structure design of the net bag enables more outer surfaces of the mineralized absorbent to be exposed in unit system area to be in contact reaction with air, so that the reaction rate is obviously improved. In addition, the material mixing part can turn over, mix and re-uniformly distribute the mineralization absorbent, so that the problem that the mineralization absorption rate is attenuated along with time due to different mineralization absorption rates inside and outside the mineralization absorbent material layer can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of CO2 capture, and in particular to a system and method for pocket mineralization of carbon dioxide in the air. Background Art

[0002] With the acceleration of the global industrialization process, the concentration of carbon dioxide (CO2) in the Earth's atmosphere has been continuously rising and has reached an unprecedented high level. This phenomenon has directly led to a significant increase in the global average temperature, posing a severe challenge to the natural ecosystem and human society. To address this global environmental problem, direct air carbon capture (DAC) technology has emerged. As an effective means of directly removing CO2 from the atmosphere, it has great potential in mitigating climate change.

[0003] However, despite several years of research and development of DAC technology and significant progress, its high cost remains one of the key factors restricting its widespread application. The main challenge faced by DAC technology is that the concentration of CO2 in the atmosphere is extremely low, only about 410 ppm, which requires the absorbent used to have extremely high selectivity and efficiency. In addition, to capture 1 ton of CO2, usually thousands of tons of air need to be processed, which poses extremely high requirements for the mass transfer efficiency between the absorbent and air.

[0004] Currently, commercially available DAC absorbents on the market mainly include several categories such as inorganic bases, supported solid amines, and alkaline polymers. Among them, inorganic bases, due to their high activity, large absorption capacity, and easy availability, have become an important part of DAC technology. According to different absorption processes, the application of inorganic bases can be divided into two forms: solution absorption and solid absorption.

[0005] Taking the solid inorganic base absorption process as an example, Heirloom Carbon Company has developed a DAC process using calcium hydroxide as the absorbent. This process reacts calcium hydroxide with CO2 in the air to form calcium carbonate, and then calcines calcium carbonate at high temperature to release pure CO2 and recycle calcium oxide as the regenerated absorbent. To increase the gas-solid contact area, this process uses a paving method to disperse calcium hydroxide in trays, achieving a relatively high mineralization rate and CO2 absorption rate per unit area. However, this method also exposes some problems, such as the need for a large number of trays, an increase in the handling workload, and a significant decrease in the absorption rate as the surface layer of the absorbent gradually mineralizes.

[0006] When the calcium hydroxide filling thickness is increased, a higher absorption rate can be obtained in the initial stage, but as the mineralization process proceeds, the internal unreacted absorbent is difficult to fully contact with the external air, resulting in a sharp drop in the absorption rate. When the calcium hydroxide layer reaches a certain thickness, the time required to achieve the same mineralization rate will be greatly extended, seriously affecting the economy and efficiency of DAC technology.

[0007] Therefore, how to achieve a higher CO2 absorption rate on a limited absorption area while maintaining the high activity of the absorbent has become a key issue that needs to be urgently solved in current DAC technology.

[0008] In view of this, the present invention is proposed. Summary of the invention

[0009] The object of the present invention is to provide a system and method for mineralizing carbon dioxide in air in a pocket-type manner, which effectively improves the efficiency of directly mineralizing carbon dioxide in air.

[0010] In a first aspect, the present invention provides a bag-type system for mineralizing carbon dioxide in air, comprising one or more layers of reaction mechanisms, each of which comprises a support plate, a lifting plate, a mixing portion and a plurality of net bags,

[0011] The support plate is evenly provided with a plurality of holes, and all the net bags are hung correspondingly below the holes;

[0012] The lifting plate is arranged parallel to and below the supporting plate, and the lifting plate can move in a direction close to or away from the supporting plate;

[0013] The mixing part is arranged above the support plate and is used for mixing and evenly distributing the mineralized absorbent on the support plate.

[0014] As a preferred embodiment of the present technical solution, it further comprises an air distribution mechanism, which is arranged in parallel on one side of the long side direction of the reaction mechanism, and the plane where the wind direction of the air distribution mechanism is located is located at the center between the lifting plate and the support plate.

[0015] As a preferred embodiment of the present technical solution, the mixing section comprises a material turning plowshare and a material distribution scraper, and the material turning plowshare and the material distribution scraper are respectively arranged on the support plate and can reciprocate along the length direction of the support plate.

[0016] As a preferred embodiment of the present technical solution, baffle plates are respectively provided on both sides of the support plate perpendicular to the mixing part.

[0017] As a preferred embodiment of the present technical solution, the opening end of the net bag is round or square, and the bottom of the net bag is square, spherical or hemispherical.

[0018] As a preferred embodiment of the present technical solution, the net bag is composed of a single layer or multiple layers of mesh cloth, and the aperture of each layer of mesh cloth is 20-200 meshes;

[0019] The mesh cloth is made of any one of cotton, polypropylene, polyester, aramid, polyamide fiber, polyacrylonitrile fiber, viscose fiber and elastic nylon.

[0020] As a preferred embodiment of the present technical solution, the lifting plate is any one of a flat plate, a corrugated plate or a wire mesh.

[0021] In a second aspect, the present invention also discloses a method for mineralizing carbon dioxide in air using the above-mentioned system for mineralizing carbon dioxide in air, characterized in that it comprises the following steps:

[0022] S1. Keep the support plate in a lifting state and evenly distribute the mineralized absorbent on the support plate;

[0023] S2, move the lifting plate downward, the mineralized absorbent above the net bag enters the net bag as the net bag is unfolded, and the position without holes on the support plate forms a three-dimensional accumulation structure of the mineralized absorbent;

[0024] S3, open the system ventilation and air distribution mechanism to allow the air to contact with the mineralized absorbent and cause mineralization reaction for 1-24 hours;

[0025] S4, stop the system ventilation and air distribution mechanism, move the lifting plate upward to lift the mineralized absorbent in the net bag onto the support plate;

[0026] S5, plowing the turning plow blade through the mineralized absorbent material layer, and then using the material scraper to evenly distribute the mineralized absorbent again;

[0027] S6. Repeat steps S3-S5 until the mineralization rate of the mineralized absorbent reaches 70%-90%, and then move all the mineralized absorbent and load new materials.

[0028] As a preferred embodiment of the present technical solution, the particle size of the mineralized absorbent is 20-100 mesh, and the distribution thickness of the mineralized absorbent is 1-10 cm, and preferably 2-5 cm;

[0029] The mineralized absorbent includes any one or more of carbide slag, calcium hydroxide, calcium oxide, steel slag and red mud.

[0030] As a preferred embodiment of the present technical solution, the wind direction of the system ventilation is the same as the movement direction of the material turning plow blade and the material spreading scraper, and the wind speed of the system ventilation is 0.1-3m / s;

[0031] The wind direction of the air distribution mechanism is 1-15° upward horizontally, and the wind speed of the air distribution mechanism is 0.5-2m / s;

[0032] The volume concentration of carbon dioxide in the air is 300 - 500 ppm, and the absolute humidity of the air is 3 - 30 g / kg.

[0033] The system for pocket mineralization of carbon dioxide in the air of the present invention has at least the following beneficial effects:

[0034] The system for pocket mineralization of carbon dioxide in the air of the present invention includes one or more reaction mechanisms, and each reaction mechanism includes a support plate, a lifting plate, a mixing part, and a plurality of mesh pockets. Among them, the support plate is used to carry the mineralization absorbent, and a plurality of holes are evenly opened on the support plate. Below each hole, a mesh pocket for loading the mineralization absorbent is suspended. The lifting plate is movably arranged parallel below the support plate, mainly used to push out the mineralization absorbent in the mesh pocket from the support plate. The mixing part arranged above the support plate is used to turn over and evenly distribute the mineralization absorbent on the support plate. When using the system for pocket mineralization of carbon dioxide in the air of the present invention to mineralize carbon dioxide in the air, part of the mineralization absorbent is located in the mesh pocket, and part is evenly distributed at the non - perforated positions on the support plate. Therefore, the three - dimensional structure design of the downward extension of the mesh pocket in the present invention enables more outer surfaces of the mineralization absorbent to be exposed to contact and react with the air per unit system area, significantly improving the reaction rate. In addition, after mineralization absorption for a period of time, the lifting plate is moved upward, and the mineralization absorbent in the mesh pocket will be lifted onto the support plate. At this time, starting the mixing part to turn over and redistribute the mineralization absorbent evenly can effectively solve the problem that the mineralization absorption rate decays with time due to different mineralization absorption rates inside and outside the mineralization absorbent layer. Therefore, the system for pocket mineralization of carbon dioxide in the air of the present invention can efficiently mineralize carbon dioxide in the air directly. Description of the Drawings

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the system for pocket mineralization of carbon dioxide in the air of the present invention;

[0037] Figure 2 It is the front view of the structure of the system for pocket mineralization of carbon dioxide in the air of the present invention.

[0038] Reference Numerals:

[0039] 1: Support plate; 2: Lifting plate; 3: Mesh pocket; 4: Air distribution mechanism; 5: Turning plow blade; 6: Cloth scraping plate; 7: Baffle plate. Detailed Embodiments

[0040] It should be noted that the following detailed description is exemplary and is 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 one of ordinary skill in the technical field to which this application belongs.

[0041] 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 form also includes the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment 1

[0044] As Figure 1-2 shown, this embodiment provides a system for pocket-style mineralizing carbon dioxide in air, including one or more reaction mechanisms. Each reaction mechanism includes a support plate 1, a lifting plate 2, a mixing part, and a plurality of mesh pockets 3. A plurality of holes are evenly formed in the support plate 1, and all the mesh pockets 3 are respectively hung and arranged below the holes; the lifting plate 2 is arranged parallel to the lower part of the support plate 1, and the lifting plate 2 can move in a direction close to or away from the support plate 1; the mixing part is arranged above the support plate 1 and is used for turning and evenly distributing the mineralization absorbent on the support plate 1.

[0045] The system for pocket-style mineralizing carbon dioxide in air in this embodiment includes one or more reaction mechanisms. The one or more reaction mechanisms are fixedly connected through a three-dimensional framework. The arrangement of multiple reaction mechanisms can effectively save ground space and improve the absorption efficiency.

[0046] Each reaction mechanism includes a support plate 1, a lifting plate 2, a mixing part and a plurality of net bags 3, wherein the support plate 1 is used to carry the mineralized absorbent, and a plurality of holes are evenly opened on the support plate 1, and a net bag 3 for loading the mineralized absorbent is suspended below each hole, and the lifting plate 2 is movably arranged parallel to the support plate 1 below, and is mainly used to push the mineralized absorbent in the net bag 3 out of the support plate 1, and the mixing part arranged above the support plate 1 is used to turn over and evenly distribute the mineralized absorbent on the support plate 1. When the system for mineralizing carbon dioxide in air using the bag-type mineralization of carbon dioxide in air of the present invention is used to mineralize carbon dioxide in air, a part of the mineralized absorbent is located in the net bag 3, and a part is evenly distributed at the position without holes on the support plate 1, therefore, the three-dimensional structure design of the net bag 3 extending downward of the present invention allows more outer surfaces of the mineralized absorbent to be exposed to react with air per unit system area, which significantly improves the reaction rate. In addition, after a period of mineralization absorption, the lifting plate 2 is moved upward, and the mineralized absorbent in the net bag 3 will be lifted onto the support plate 1. At this time, starting the mixing part to mix the mineralized absorbent and redistribute it evenly can effectively solve the problem of different mineralization absorption rates inside and outside the mineralized absorbent layer causing the mineralization absorption rate to decay over time.

[0047] Therefore, the system for mineralizing carbon dioxide in air of the present invention can directly mineralize carbon dioxide in air with high efficiency.

[0048] On the basis of the above technical solution, it is further preferred that the system for mineralizing carbon dioxide in air in a bag type also includes an air distribution mechanism 4, which is arranged in parallel on one side of the long side direction of the reaction mechanism, and the plane where the wind direction of the air distribution mechanism 4 is located is located at the center between the lifting plate 2 and the support plate 1. The wind direction of the air distribution mechanism is 1-15° upward horizontally, perpendicular to the system wind direction, so as to give an upward wind vector to the air flow between the lifting plate and the support plate on the basis of sufficient ventilation, so as to overcome the wind resistance between the net bag 3, thereby allowing the air to contact the outer surface of the net bag 3 more fully.

[0049] In a specific embodiment of the present invention, the air distribution mechanism 4 may directly use an air distribution fan, or may use an air duct or a porous plate for air distribution.

[0050] On the basis of the above technical solution, it is further preferred that the mixing part includes a turning plow 5 and a distribution scraper 6, and the turning plow 5 and the distribution scraper 6 are respectively arranged on the support plate 1, and can reciprocate along the length direction of the support plate 1, wherein the turning plow 5 has a turning and mixing function, which can fully turn and mix the material on the support plate 1, and the distribution scraper 6 has the function of redistributing the material on the support plate 1 evenly, and specifically the distance between it and the support plate 1 can be adjusted according to the loading amount of the material.

[0051] Specifically, the reciprocating movement of the material turning plow blade 5 and the cloth scraping plate 6 on the support plate 1 can be achieved by means of motor drive, hydraulic drive, pneumatic or electric push rod.

[0052] For example, when the reciprocating movement of the material turning plow blade 5 and the cloth scraping plate 6 is achieved by means of motor drive:

[0053] First, a suitable motor is selected as the power source, and the output shaft of the motor is connected to the transmission shafts of the material turning plow blade 5 and the cloth scraping plate 6 through transmission devices such as gears, chains or belts.

[0054] At the same time, a motor controller is set up to control the start, stop and forward and reverse rotation of the motor. In addition, the controller can also receive signals from other parts of the system (such as sensor signals or operator instructions) and control the movement of the motor according to the signals.

[0055] When the material turning plow blade 5 needs to perform the turning and mixing operation, the motor controller starts the motor, and the motor drives the material turning plow blade 5 to reciprocate along the length direction on the support plate 1 through the transmission device.

[0056] When the cloth scraping plate 6 needs to perform the cloth spreading operation, the motor controller also starts the motor, but at this time the motor drives the cloth scraping plate 6 to reciprocate through the transmission device.

[0057] In addition, limit switches or sensors can be set to detect the positions of the material turning plow blade 5 and the cloth scraping plate 6 to prevent them from exceeding the set movement range.

[0058] In addition, an overload protection device can be set on the motor and the transmission device to prevent damage to the equipment due to overload.

[0059] To further prevent the material from scattering outside the system during the turning and mixing and redispersion processes, baffle plates 7 are respectively arranged on both sides of the support plate 1 perpendicular to the mixing part. Specifically, the height of the baffle plate 7 is any value between 3 - 10 cm, and can be specifically selected according to the cloth spreading thickness of the mineralizing absorbent.

[0060] On the basis of the above technical solution, further preferably, the open end of the mesh bag 3 is circular or square, and is preferably circular. When the open end of the mesh bag 3 is circular, its diameter is preferably 3 - 12 cm. The bottom of the mesh bag 3 is square, spherical crown-shaped or hemispherical, and the depth of the mesh bag 3 is 1 - 10 cm, and is preferably 2 - 6 cm.

[0061] Among them, when the opening end of the mesh bag 3 is designed to be circular, it can distribute the air flow more evenly, reduce the dead corners of the air flow, so that more surfaces of the mineralized absorbent can be exposed to the air, thereby increasing the contact opportunity with carbon dioxide. In addition, the mesh bag 3 with a circular opening can form a certain three-dimensional space when hanging, and this spatial structure helps the air to form vortices or turbulences inside the mesh bag 3, further improving the mixing degree and contact efficiency between the mineralized absorbent and the air.

[0062] The bottom of the mesh bag 3 is designed in shapes such as square, spherical crown or hemispherical, etc. These shapes can ensure the uniform distribution of the mineralized absorbent in the mesh bag 3, avoid local accumulation or vacancy, and thus improve the uniformity of the mineralization reaction.

[0063] When remixing the mineralized absorbent on the support plate 1 in the mixing section, the mesh bag 3 with a reasonable bottom shape can more easily cooperate with the remixing action, so that the mineralized absorbent can be more fully remixed and redistributed, thereby extending the effective service life of the mineralized absorbent.

[0064] In addition, the mesh bag 3 with a circular opening can reduce wind resistance and vibration when hanging, and reduce the noise and energy consumption during the operation of the system. The depth of the mesh bag 3 is set at 1 - 10 cm, which can not only ensure a sufficient loading amount of the mineralized absorbent, but also avoid problems such as complex system structure and difficult maintenance caused by too deep a mesh bag 3.

[0065] On the basis of the above technical solutions, more preferably, the mesh bag 3 is composed of single-layer or multi-layer mesh fabrics, and the aperture of each layer of mesh fabric is 20 - 200 meshes; and the material of the mesh fabric is any one of cotton cloth, polypropylene, polyester, aramid, polyamide fiber, polyacrylonitrile fiber, viscose fiber and elastic nylon.

[0066] The holes on the single-layer mesh fabric allow air to pass through, which can already increase the exposed area of the mineralized absorbent, so that the mineralized absorbent located in the mesh bag 3 can be in full contact with the air. The design of the multi-layer mesh fabric further expands the exposed area because each layer of mesh fabric provides an additional contact surface. Therefore, the design of the multi-layer mesh fabric can expose more outer surfaces of the mineralized absorbent per unit system area, thus significantly improving the reaction rate and reaction efficiency.

[0067] The material and aperture size of the mesh bag 3 can be adjusted according to different mineralized absorbents. For example, for mineralized absorbents with larger particles, mesh fabrics with larger apertures can be selected; for mineralized absorbents that require higher strength support, the design of multi-layer mesh fabrics can be selected.

[0068] On the basis of the above technical solutions, further preferably, the lifting plate 2 is any one of a flat plate, a corrugated plate or a wire mesh.

[0069] Among them, the flat plate structure is strong and not easy to deform, which can ensure stability during the lifting and lowering process, and can evenly push out the mineralized absorbent in the net bag 3 to avoid scattering or uneven accumulation of the mineralized absorbent;

[0070] The design of the corrugated plate increases the surface area and air permeability, which helps the air to circulate in the mineralized absorbent layer and improves the contact opportunity between carbon dioxide and the mineralized absorbent; in addition, the corrugated structure can form tiny air flow channels, which promotes the diffusion and mixing of air in the mineralized absorbent, thereby increasing the reaction rate.

[0071] The wire mesh is lightweight and high-strength, which can reduce the overall weight of the system while maintaining sufficient strength and stability. In addition, the wire mesh has an open structure and excellent air permeability, which helps the free circulation of air and improves the contact efficiency between carbon dioxide and mineralized absorbent.

[0072] The method for mineralizing carbon dioxide in air using the above-mentioned system as the most preferred pocket-type mineralization of carbon dioxide in air is as follows. Specifically, the overall frame size of the pocket-type mineralization of carbon dioxide in air system used in the following embodiments is 3.5m*1m, and is equipped with a 3.5m*1m support plate 1 and a lifting plate 2, the support plate 1 is equipped with a 1m long material turning plow 5 and a material spreading scraper 6, and both sides of the support plate 1 are equipped with a 3.5m long and 7cm high material blocking plate 7. The material laying range is 3m*1m.

[0073] In addition, in the following examples, the content of calcium hydroxide in the mineralized absorbent carbide slag is 80.43wt%, and the water content is 5.08wt%.

[0074] The quantification of carbonate in the sample adopts the hydrochloric acid method. Specifically, the absorption amount of CO2 in the sample is determined by the difference in the amount of CO2 released in the sample before and after absorption.

[0075] The conversion rate C% of calcium hydroxide in the sample is:

[0076] C%=74*(C2-C1) / C0(100-26C2)

[0077] Where: C1 is the mass fraction of dry calcium carbonate in the raw material, wt%;

[0078] C2 is the mass fraction of dry calcium carbonate in the mineralized product, wt%;

[0079] C0 is the mass fraction of calcium hydroxide on a dry basis in the raw material, wt.

[0080] Example 2

[0081] In this embodiment, the opening end of the net bag 3 on the support plate 1 is a circle with a diameter of 5 cm, the depth of the net bag 3 is 4 cm, the material of the net bag 3 is polyamide fiber, and the mesh number of the net bag 3 is 50 meshes. The steps of mineralizing carbon dioxide in the air are as follows:

[0082] S1, keep the lifting plate 2 in the lifting state, and under the condition of closing the ventilation, place 58.7kg, 20-50 mesh carbide slag mineralized absorbent on one end of the support plate 1 close to the distribution scraper 6, and evenly distribute the mineralized absorbent through the distribution scraper 6;

[0083] S2, the lifting plate 2 is moved downward, and the mineralized absorbent above the net bag 3 enters the net bag 3 as the net bag 3 is unfolded, and the position without holes on the support plate 1 forms a three-dimensional stacking structure of the mineralized absorbent;

[0084] S3, turn on the system ventilation and the air distribution mechanism 4, so that the air contacts the mineralized absorbent and a mineralization reaction occurs, wherein the wind direction of the system ventilation is the same as the movement direction of the material turning plow blade 5 and the material distribution scraper 6, and the wind speed of the system ventilation is 2m / s; the wind direction of the air distribution mechanism 4 is 10° upward horizontally, and the wind speed of the air distribution mechanism 4 is 1.5m / s, and the absolute humidity of the air is 9-12g / kg;

[0085] S4, after 2 hours of absorption, stop the system ventilation and air distribution mechanism 4, move the lifting plate 2 upward to lift the mineralized absorbent in the net bag 3 onto the support plate 1;

[0086] S5, plowing the material turning plow blade 5 through the mineralized absorbent material layer, and then using the material spreading scraper 6 to evenly distribute the mineralized absorbent again;

[0087] S6. Repeat steps S3-S5 every 2 hours.

[0088] During the mixing process, a small amount of mineralized absorbent will fall from the mesh of the net bag 3 onto the lifting plate 2, which does not affect the operation process. Finally, the mineralized absorbent on the lifting plate 2 is combined with the mineralized absorbent in the support plate 1 and the net bag 3 for further analysis.

[0089] After 170 hours, the conversion rate of carbide slag was measured to be 81.1% (calculated as calcium hydroxide conversion rate).

[0090] Example 3

[0091] In this embodiment, the opening end of the net bag 3 on the support plate 1 is a circle with a diameter of 5 cm, the depth of the net bag 3 is 3 cm, the material of the net bag 3 is polypropylene, and the mesh number of the net bag 3 is 60 meshes. The steps of mineralizing carbon dioxide in the air are as follows:

[0092] S1, keep the lifting plate 2 in the lifting state, and under the condition of closing the ventilation, place 49kg, 20-60 mesh carbide slag mineralized absorbent on one end of the support plate 1 close to the distribution scraper 6, and evenly distribute the mineralized absorbent through the distribution scraper 6;

[0093] S2, the lifting plate 2 is moved downward, and the mineralized absorbent above the net bag 3 enters the net bag 3 as the net bag 3 is unfolded, and the position without holes on the support plate 1 forms a three-dimensional stacking structure of the mineralized absorbent;

[0094] S3, open the system ventilation and air distribution mechanism 4, so that the air contacts the mineralized absorbent and a mineralization reaction occurs, wherein the wind direction of the system ventilation is the same as the movement direction of the material turning plow blade 5 and the material distribution scraper 6, and the wind speed of the system ventilation is 1.8m / s; the wind direction of the air distribution mechanism 4 is 10° upward horizontally, and the wind speed of the air distribution mechanism 4 is 1.3m / s, and the absolute humidity of the air is 9-12g / kg (dry air);

[0095] S4, after 2 hours of absorption, stop the system ventilation and air distribution mechanism 4, move the lifting plate 2 upward to lift the mineralized absorbent in the net bag 3 onto the support plate 1;

[0096] S5, plowing the material turning plow blade 5 through the mineralized absorbent material layer, and then using the material spreading scraper 6 to evenly distribute the mineralized absorbent again;

[0097] S6. Repeat steps S3-S5 every 2 hours.

[0098] During the mixing process, a small amount of mineralized absorbent will fall from the mesh of the net bag 3 onto the lifting plate 2, which does not affect the operation process. Finally, the mineralized absorbent on the lifting plate 2 is combined with the mineralized absorbent in the support plate 1 and the net bag 3 for further analysis.

[0099] After 150 hours, the conversion rate of carbide slag was measured to be 82.3% (calculated as calcium hydroxide conversion rate).

[0100] Example 4

[0101] In this embodiment, the opening end of the net bag 3 on the support plate 1 is a circle with a diameter of 5 cm, the depth of the net bag 3 is 5 cm, the material of the net bag 3 is elastic nylon, and the mesh number of the net bag 3 is 40-50 meshes. The steps of mineralizing carbon dioxide in the air are as follows:

[0102] S1, keep the lifting plate 2 in the lifting state, and under the condition of closing the ventilation, place 78.4kg, 20-50 mesh carbide slag mineralized absorbent on one end of the support plate 1 close to the distribution scraper 6, and evenly distribute the mineralized absorbent through the distribution scraper 6;

[0103] S2. Lower the lifting plate 2. The mineralized absorbent above the mesh bag 3 enters the mesh bag 3 as the mesh bag 3 unfolds, and a three-dimensional stacking structure of the mineralized absorbent is formed at the unperforated positions on the support plate 1.

[0104] S3. Turn on the system ventilation and the air distribution mechanism 4 to make the air contact with the mineralized absorbent and carry out the mineralization reaction. Among them, the wind direction of the system ventilation is the same as the movement directions of the turning plow blade 5 and the cloth scraping plate 6, and the wind speed of the system ventilation is 1.5 m / s; the wind direction of the air distribution mechanism 4 is 10° upward horizontally, and the wind speed of the air distribution mechanism 4 is 1.2 m / s, and the absolute humidity of the air is 9 - 12 g / kg (dry air).

[0105] S4. After 2 hours of absorption, stop the system ventilation and the air distribution mechanism 4, and move the lifting plate 2 upward to lift the mineralized absorbent in the mesh bag 3 onto the support plate 1.

[0106] S5. Plow the turning plow blade 5 over the mineralized absorbent layer, and then use the cloth scraping plate 6 to redistribute the mineralized absorbent evenly.

[0107] S6. Repeat steps S3 - S5 every 2 hours.

[0108] During the turning and mixing process, a very small part of the mineralized absorbent will fall from the mesh holes of the mesh bag 3 onto the lifting plate 2, which does not affect the operation process. Finally, the mineralized absorbent on the lifting plate 2 is combined with the mineralized absorbent on the support plate 1 and in the mesh bag 3 and then analyzed.

[0109] After 200 hours, the conversion rate of carbide slag is measured to be 81.7% (calculated based on the conversion rate of calcium hydroxide).

[0110] Example 5

[0111] In this example, the opening end of the mesh bag 3 on the support plate 1 is a circle with a diameter of 6 cm, the depth of the mesh bag 3 is 5 cm, the material of the mesh bag 3 is polyamide fiber, and the mesh number of the mesh bag 3 is 60 mesh. The steps for mineralizing carbon dioxide in the air are as follows:

[0112] S1. Keep the lifting plate 2 in the lifting state. Under the condition of closing the ventilation, place 98 kg of carbide slag mineralized absorbent with a particle size of 20 - 60 mesh at one end of the support plate 1 close to the cloth scraping plate 6, and distribute the mineralized absorbent evenly through the cloth scraping plate 6.

[0113] S2. Lower the lifting plate 2. The mineralized absorbent above the mesh bag 3 enters the mesh bag 3 as the mesh bag 3 unfolds, and a three-dimensional stacking structure of the mineralized absorbent is formed at the unperforated positions on the support plate 1.

[0114] S3. Turn on the system ventilation and the air distribution mechanism 4 to make the air contact with the mineralized absorbent and carry out the mineralization reaction. Among them, the wind direction of the system ventilation is the same as the movement directions of the turning plow blade 5 and the cloth scraping plate 6, and the wind speed of the system ventilation is 2 m / s; the wind direction of the air distribution mechanism 4 is 10° upward horizontally, and the wind speed of the air distribution mechanism 4 is 1.5 m / s, and the absolute humidity of the air is 9 - 12 g / kg (dry air).

[0115] S4. After 2 hours of absorption, stop the system ventilation and the air distribution mechanism 4, and move the lifting plate 2 upward to lift the mineralized absorbent in the mesh bag 3 onto the support plate 1.

[0116] S5. Plow the turning plow blade 5 over the mineralized absorbent layer, and then use the cloth scraping plate 6 to make the mineralized absorbent evenly distributed again.

[0117] S6. Repeat steps S3 - S5 every 2 hours.

[0118] During the turning and mixing process, a very small part of the mineralized absorbent will fall from the mesh holes of the mesh bag 3 onto the lifting plate 2, which does not affect the operation process. Finally, the mineralized absorbent on the lifting plate 2 is combined with the mineralized absorbent on the support plate 1 and in the mesh bag 3 and then analyzed.

[0119] After 250 hours, the conversion rate of carbide slag is measured to be 77.4% (calculated based on the conversion rate of calcium hydroxide).

[0120] Control Example 1

[0121] This control example is basically the same as Example 2, except that: there are no holes opened on the support plate 1 in this control example, and the mesh bag 3 is not provided. The specific steps are as follows:

[0122] Lay 58.7 kg of carbide slag flat on the flat plate, and use the cloth scraping plate 6 to distribute the carbide slag into a rectangular carbide slag layer of 3 m * 1 m, with a thickness of about 3 cm.

[0123] Turn on the system ventilation, with a wind speed of 2 m / s and an air humidity of 9 - 12 g / kg (dry air).

[0124] After 2 hours of absorption, stop the ventilation, use the turning plow blade 5 to turn over and mix the carbide slag once, and then use the cloth scraping plate 6 to redistribute the material evenly again.

[0125] After that, turn over and mix the material every 2 hours.

[0126] After 170 hours, the conversion rate of carbide slag is measured to be 38.9% (calculated based on the conversion rate of calcium hydroxide).

[0127] Control Example 2

[0128] This comparative example is basically the same as Example 2, except that: the support plate 1 is composed of a 60-mesh sieve and a support skeleton, and there is no mesh pocket 3 on the support plate 1. The specific steps are as follows:

[0129] Spread 58.7 kg of carbide slag evenly on the sieve, and use the cloth scraper 6 to distribute the carbide slag into a rectangular carbide slag layer of 3 m * 1 m, with a thickness of about 3 cm;

[0130] Start the system ventilation, with a wind speed of 2 m / s and an air humidity of 9 - 12 g / kg (dry air);

[0131] After 2 hours of absorption, stop the ventilation, use the turning plow knife 5 to turn and mix the carbide slag once, and then use the cloth scraper 6 to redistribute the material evenly;

[0132] After that, turn and mix the material every 2 hours.

[0133] After 170 hours, the conversion rate of carbide slag was measured to be 63.2% (calculated based on the conversion rate of calcium hydroxide).

[0134] Comparative Example 3

[0135] On the basis of Comparative Example 2, this comparative example adds a groove and ridge shape to the carbide slag layer to increase the external contact surface area between the carbide slag and the air in space. The specific steps are as follows:

[0136] Spread 58.7 kg of carbide slag evenly on the sieve, and use the cloth scraper 6 to distribute the carbide slag into a rectangular carbide slag layer of 3 m * 1 m, with a thickness of about 3 cm;

[0137] Use a straight plow knife to cut out a neat groove and ridge structure, with a distance of 7 cm between any two adjacent grooves and a groove depth of 1.5 cm

[0138] Start the system ventilation, with a wind speed of 2 m / s and an air humidity of 9 - 12 g / kg (dry air);

[0139] After 2 hours of absorption, stop the ventilation, use the turning plow knife 5 to turn and mix the carbide slag once, and then use the straight plow knife to cut out a neat groove and ridge structure;

[0140] After that, turn and mix the material every 2 hours.

[0141] After 170 hours, the conversion rate of carbide slag was measured to be 65.2% (calculated based on the conversion rate of calcium hydroxide).

[0142] Table 1 shows the conversion rates of carbide slag in Examples 2 - 5 and Comparative Examples 1 - 3

[0143] Serial number Conversion rate of carbide slag % Example 2 81.1 Example 3 82.3 Example 4 81.7 Example 5 77.4 Control example 1 38.9 Control example 2 63.2 Control example 3 65.2

[0144] As can be seen from Table 1, when using the system for mineralizing carbon dioxide in air of the present invention to mineralize carbon dioxide in air, compared with Comparative Examples 1-3, the conversion rate of the mineralizing absorbent has been significantly improved, further indicating that the outer surface area of the mineralizing absorbent in direct contact with air directly affects the carbon dioxide absorption rate. The three-dimensional structure design of the present invention that extends downward through the mesh bag 3 significantly increases the contact area between the mineralizing absorbent and air, and the mixing part solves the problem that the mineralization absorption rate decays with time due to different mineralization rates in the inner and outer layers of the material layer.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and 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 system for mineralizing carbon dioxide in air, characterized in that: It comprises one or more layers of reaction mechanisms, each of which comprises a support plate (1), a lifting plate (2), a mixing portion and a plurality of net bags (3). The support plate (1) is evenly provided with a plurality of holes, and all the net bags (3) are suspended and arranged below the holes respectively; The lifting plate (2) is arranged parallel to and below the supporting plate (1), and the lifting plate (2) can move in a direction approaching or moving away from the supporting plate (1); The mixing section is arranged above the support plate (1) and is used for mixing and evenly distributing the mineralized absorbent on the support plate (1).

2. The system for mineralizing carbon dioxide in air according to claim 1, characterized in that: It also includes an air distribution mechanism (4), which is arranged parallel to one side of the long side of the reaction mechanism, and the plane where the wind direction of the air distribution mechanism (4) is located is located at the center between the lifting plate (2) and the support plate (1).

3. The system for mineralizing carbon dioxide in air according to claim 1, characterized in that: The mixing section comprises a material turning plowshare (5) and a material distribution scraper (6); the material turning plowshare (5) and the material distribution scraper (6) are respectively arranged on the support plate (1) and can both reciprocate along the length direction of the support plate (1).

4. The system for mineralizing carbon dioxide in air according to claim 1, characterized in that: Material blocking plates (7) are respectively arranged on two sides of the support plate (1) perpendicular to the material mixing portion.

5. The system for mineralizing carbon dioxide in air according to claim 1, characterized in that: The opening end of the net bag (3) is circular or square, and the bottom of the net bag (3) is square, spherical or hemispherical.

6. The system for mineralizing carbon dioxide in air according to claim 1, characterized in that: The net bag (3) is composed of a single layer or multiple layers of mesh cloth, and the aperture of each layer of mesh cloth is 20-200 meshes; The mesh cloth is made of any one of cotton, polypropylene, polyester, aramid, polyamide fiber, polyacrylonitrile fiber, viscose fiber and elastic nylon.

7. The system for mineralizing carbon dioxide in air according to claim 1, characterized in that: The lifting plate (2) is any one of a flat plate, a corrugated plate or a wire mesh.

8. A method for mineralizing carbon dioxide in air using the system for mineralizing carbon dioxide in air as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, keeping the lifting plate (2) in a lifting state, and evenly distributing the mineralized absorbent on the support plate (1); S2, the lifting plate (2) is moved downward, and the mineralized absorbent above the net bag (3) enters the net bag (3) as the net bag (3) is unfolded, and a three-dimensional stacking structure of the mineralized absorbent is formed at the position where the hole is not opened on the support plate (1); S3, opening the system ventilation and air distribution mechanism (4) to allow air to contact the mineralizing absorbent and cause a mineralization reaction; S4, stopping the system ventilation and air distribution mechanism (4), moving the lifting plate (2) upward to lift the mineralized absorbent in the net bag (3) onto the support plate (1); S5, plowing the mineralized absorbent layer with a plowshare (5), and then using a material distribution scraper (6) to evenly distribute the mineralized absorbent again; S6. Repeat steps S3-S5 until the mineralization rate of the mineralized absorbent reaches 70%-90%, and then move all the mineralized absorbent and load new materials.

9. The method according to claim 8, characterized in that The particle size of the mineralized absorbent is 20-100 mesh, and the distribution thickness of the mineralized absorbent is 1-10 cm; The mineralized absorbent includes any one or more of carbide slag, calcium hydroxide, calcium oxide, steel slag and red mud.

10. The method according to claim 8, characterized in that The wind direction of the system ventilation is the same as the movement direction of the material turning plow blade (5) and the material distribution scraper (6), and the wind speed of the system ventilation is 0.1-3m / s; The wind direction of the wind distribution mechanism (4) is 1-15° upward horizontally, and the wind speed of the wind distribution mechanism (4) is 0.5-2 m / s; The volume concentration of carbon dioxide in the air is 300-500 ppm, and the absolute humidity of the air is 3-30 g / kg.

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