A system and method for mineralizing carbon dioxide in air

Abstract

The present invention relates to a system and method for mineralizing carbon dioxide in air, comprising: an air intake system, an absorption channel, a plurality of absorption modules, an absorption module conveying system, and a humidification system; the air intake system can make air flow from the air inlet end to the air outlet end of the absorption channel; an absorption module outlet is provided on one side of the absorption channel close to its air inlet end, and an absorption module inlet is provided on one side of the absorption channel close to its air outlet end; the absorption modules are placed in the absorption channel, and an absorbent is contained in the absorption modules, and the absorbent is in granular form; the absorption module conveying system is located in the absorption channel and is used for conveying the absorption modules between the absorption module inlet and the absorption module outlet; the humidification system is located at the air inlet end of the absorption channel. The present invention adopts a channel-type gas-solid countercurrent contact cascade absorption, uses granular absorbents, improves the absorption efficiency of CO2, greatly reduces the water consumption for capturing CO2, and is suitable for large-scale popularization and use in areas rich in alkaline solids and with low air humidity.

Description

Technical Field

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

[0002] As the concentration of CO2 in the earth's atmosphere reaches a new high, the average temperature of the earth has also broken through the historical high. Direct air capture (DAC) is one of the few technologies that can directly remove carbon dioxide from the atmosphere. Although the concentration of CO2 has reached a new high, it is still relatively low compared to point sources. Therefore, chemical adsorbents with strong binding properties have become the most studied for air capture, and the capture cost is much higher than that of point capture of CO2 (CDR) in areas with higher concentrations.

[0003] Carbon engineering company has developed a liquid-solid precipitation double cycle method. This method uses potassium hydroxide solution as an absorbent to absorb CO2 in the air. The obtained absorbent solution reacts with calcium hydroxide to regenerate potassium hydroxide and is reused in the absorption reactor. At the same time, calcium carbonate precipitates from the solution. The solid calcium carbonate obtained after solid-liquid separation is decomposed into calcium oxide at a high temperature of about 900 °C in a calciner and pure CO2 is released. Because potassium hydroxide solution is used as an absorbent, the water content will reach saturation after the air comes into full contact with the absorbent. Therefore, this process consumes a large amount of water. To reduce water consumption, this process needs to be built in areas with high humidity. If built in dry areas, an additional 19.9 t / t-CO2 of water needs to be replenished. Heirloom carbon company has developed a calcium hydroxide single cycle method. This method uses calcium hydroxide as an absorbent to absorb CO2 in the air to obtain the mineralization product calcium carbonate. Then, the calcium carbonate is decomposed into calcium oxide at a high temperature of about 900 °C in a calciner and pure CO2 is released. Because solid calcium hydroxide needs to maintain sufficient water content in the air to react with CO2 in the air, this process needs to be built in areas with higher humidity. If built in dry areas, an additional 8.6 t / t-CO2 of water needs to be replenished. In addition, this process uses a flat-laying method to disperse calcium hydroxide in a tray, and the optimal loading amount is 1248 g, with a converted thickness of about 1.5 mm, which greatly increases the workload of loading and unloading the absorbent. This is because as the stacking thickness of the absorbent in powder state increases, the mass transfer resistance also increases, so the conversion rate of calcium hydroxide will be reduced.

[0004] Both of the above two processes require a humid air environment, so it is determined that only alkaline solids can be used as the intermediate circulation medium in these processes. Therefore, after mineralization, the alkaline solids need to be calcined to release CO2 again and then transferred to the area for in-situ mineralization of CO2 for storage. Therefore, in order to reduce costs, not only the device needs to be built in an area with humid air, but also resources for in-situ mineralization and storage of CO2 are required. This will greatly limit the implementation of this process.

[0005] In areas rich in alkaline solids, after the alkaline solids directly react with CO2 in the air for mineralization, they can be directly landfilled and stored without the calcination and release process, saving costs. However, the air humidity in areas rich in alkaline solids is usually low. Therefore, developing a DAC system suitable for the environmental characteristics of these areas is a feasible solution to the high cost of current DAC.

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

[0007] The purpose of the present invention is to provide a system and method for mineralizing carbon dioxide in the air, which can directly mineralize CO2 in the air, with high CO2 absorption efficiency and low water consumption.

[0008] In the first aspect of the present invention, a system for mineralizing carbon dioxide in the air is provided, including: an air intake system, an absorption channel, a plurality of absorption modules, an absorption module conveying system, and a humidification system; the air intake system can make air flow from the intake end to the outlet end of the absorption channel; an absorption module outlet is arranged on one side of the absorption channel close to its intake end, and an absorption module inlet is arranged on one side of the absorption channel close to its outlet end; the absorption module is placed in the absorption channel, and an absorbent is contained in the absorption module, and the absorbent is in granular form; the absorption module conveying system is located in the absorption channel and is used to convey the absorption module between the absorption module inlet and the absorption module outlet; the humidification system is located at the intake end of the absorption channel.

[0009] Preferably, several layers of absorbent bearing trays are arranged at intervals on both sides inside the absorption module, with a spacing of 2 - 30 cm between each layer, preferably 5 - 20 cm.

[0010] Preferably, the absorbent bearing tray is of a square plate structure.

[0011] Preferably, the absorbent bearing tray is inclined.

[0012] Preferably, openings are arranged at the bottom and side of the absorbent bearing tray to increase the air permeability.

[0013] Preferably, it further includes: an absorbent feeding system; the absorbent feeding system is arranged on the absorption channel and above the inlet of the absorption module. More preferably, the absorbent feeding system can rotate the absorption module by an angle at both ends, facilitating the uniform distribution of the absorbent onto each absorbent carrier plate.

[0014] Preferably, the absorbent feeding system stores absorbent, and the loading amount of the absorbent is determined by the structure of the absorption module.

[0015] Preferably, the air inlet system includes: an air inlet channel and an air outlet channel; the air inlet channel is connected to the air inlet end of the absorption channel, and the air outlet channel is connected to the air outlet end of the absorption channel.

[0016] Preferably, a blower is arranged in the air inlet channel, and an induced draft fan is arranged in the air outlet channel.

[0017] Preferably, a humidification system is arranged in the air inlet channel, and a dust removal system is arranged in the air outlet channel.

[0018] Specifically, the structure of the absorption module has many forms. For example: a cubic frame structure, and several absorbent carrier plates can be suspended or welded on the multi-layer frames of the frame. Air can pass through the frame and fully contact and react with the absorbent. The upper part of the frame is an open structure for adding absorbent.

[0019] Preferably, the absorbent is granular, more preferably spherical, such as spherical carbide slag.

[0020] Preferably, the content of calcium hydroxide and total calcium in the absorbent is determined by the method of EDTA complexometric titration.

[0021] Preferably, the particle size of the absorbent is 1 - 6 mm, more preferably 2 - 4 mm.

[0022] Preferably, the number of the absorption modules is 6 - 10, more preferably 8.

[0023] Preferably, the length of the absorption channel is 1 - 30 m, more preferably 2 - 20 m.

[0024] In the second aspect of the present invention, a method for mineralizing carbon dioxide in the air is provided, including the following steps:

[0025] S1. Add the absorbent into the absorption module.

[0026] Preferably, step S1 includes:

[0027] S11. Crush the alkaline solid absorbent and use a granulator to make it into 1-6 mm particles (preferably spherical) by the rolling granulation method, preferably 1-3 mm. Granulation can increase the absorption area of the absorbent and reduce the mass transfer resistance.

[0028] Preferably, the wetting agent used for granulation is water.

[0029] Optionally, the binder added during granulation is one or more of starch, gelatin, carrageenan, gum arabic, ethyl cellulose, sodium carboxymethyl cellulose, methyl cellulose, PVA, polyacrylamide, etc.

[0030] S12. Add the granular absorbent to the absorbent carrier tray of the absorption module through the absorbent feeding system. The filling thickness in each absorbent carrier tray is 1-30 mm, preferably 3-20 mm.

[0031] S2. After being transported by the absorption module conveying system, several absorption modules are distributed in the absorption channel.

[0032] S3. After being humidified by the humidification system, air is transported into the absorption channel. CO2 in the air comes into contact with the absorbent in the absorption module in the absorption channel, and a mineralization reaction occurs.

[0033] Preferably, step S3 includes: air enters the intake channel under the action of a blower and an induced draft fan, is humidified by the humidification system and then transported into the absorption channel. CO2 in the air comes into contact with the absorbent in the absorption module in the absorption channel for 36-320 hours, and a mineralization reaction occurs.

[0034] Control the air velocity in the channel by the air flow. Preferably, the empty tube air velocity of the air is 0.1-5 m / s, preferably 0.5-3 m / s.

[0035] Preferably, control the water content in the air by the humidification system to be not less than 2 g / kg (air). More preferably, control the water content in the air to be not less than 3 g / kg (air). If the water content is higher than the set value, there is no need to turn on the humidification system to replenish water.

[0036] S4. Carry out a sealing treatment on the absorbent after the mineralization reaction (for use as mine backfill, roadbed, etc.).

[0037] Preferably, the following steps are further included: Remove an absorption module from the outlet of the absorption module at regular intervals. At the same time, move a distance of one absorption module through the absorption module conveying system to the outlet of the absorption module, then add an empty absorption module at the inlet of the absorption module, and add absorbent through the feeding system.

[0038] Specifically, the moving mode of the absorption module conveying system can be slow movement or intermittent movement.

[0039] Beneficial effects:

[0040] (1) In the present invention, a number of absorption modules are placed in the absorption channel, and the absorption modules are transported through the absorption module conveying system, enabling a channel-type gas-solid countercurrent contact cascade absorption method between the absorption modules and the air, greatly improving the absorption efficiency of CO2.

[0041] (2) The absorbent of the present invention is granular (preferably spherical). Compared with the powdered absorbent, it has a larger external surface area, reduces the internal diffusion mass transfer resistance, enhances the loading capacity of the absorption module, thereby improving the absorption efficiency of CO2 and reducing the workload of loading and unloading the absorbent.

[0042] (3) The water consumption for capturing and storing CO2 in the present invention is reduced to 3 - 5 t / t-CO2, greatly reducing the water consumption, and is suitable for large-scale popularization and use in areas rich in alkaline solids and with low air humidity. Description of the drawings

[0043] 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 drawings in the following description 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.

[0044] Figure 1 It is a schematic structural diagram of the system for mineralizing carbon dioxide in the air provided by the present invention.

[0045] Figure 2 It is a cross-sectional view of the absorption module provided by the present invention.

[0046] Description of the reference numerals: 1, intake channel; 2, absorption module outlet; 3, absorbent feeding system; 4, dust removal system; 5, induced draft fan; 6, absorption module inlet; 7, absorption module; 8, absorption module conveying system; 9, humidification system; 10, absorbent bearing tray. Specific embodiments

[0047] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined. In addition, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Embodiment 1

[0051] Such as Figures 1 to 2As shown in the figure, this embodiment provides a system for mineralizing carbon dioxide in the air, including: an intake system, an absorption channel, eight absorption modules 7, an absorption module conveying system 8, and a humidification system 9; the intake system can make air flow from the intake end to the outlet end of the absorption channel; an absorption module outlet 2 is provided on one side of the absorption channel close to its intake end, and an absorption module inlet 6 is provided on one side of the absorption channel close to its outlet end; the absorption modules 7 are placed in the absorption channel, and an absorbent is contained in the absorption modules 7, and the absorbent is spherical; the absorption module conveying system 8 is located in the lower part of the absorption channel and is used to transfer the absorption modules 7 between the absorption module inlet 6 and the absorption module outlet 2; the humidification system 9 is located at the intake end of the absorption channel. By placing a number of absorption modules in the absorption channel and transporting the absorption modules through the absorption module conveying system, a channel-type gas-solid countercurrent contact cascade absorption method is adopted between the absorption modules and the air, greatly improving the absorption efficiency of CO2; the absorbent is spherical, which has a larger external surface area compared with the powdered absorbent, reduces the internal diffusion mass transfer resistance, enhances the loading capacity of the absorption module, thereby improving the absorption efficiency of CO2 and reducing the workload of loading and unloading the absorbent; the water consumption for capturing and storing CO2 is reduced to 3 - 5 t / t-CO2, greatly reducing the water consumption, and is suitable for large-scale popularization and use in areas rich in alkaline solids and with low air humidity.

[0052] In this embodiment, it further includes: an absorbent feeding system 3; the absorbent feeding system 3 is arranged on the absorption channel and is located above the absorption module inlet 6 for filling the absorption modules 7 with absorbent.

[0053] In this embodiment, the absorbent feeding system 3 stores an absorbent, and the absorbent is spherical carbide slag, and the calcium hydroxide content in the carbide slag is 80.43 wt%.

[0054] In this embodiment, the intake system includes: an intake channel 1 and an outlet channel; the intake channel 1 is connected to the intake end of the absorption channel to promote the uniform distribution of air in the intake channel 1, and the outlet channel is connected to the outlet end of the absorption channel.

[0055] In this embodiment, a humidification system 9 is arranged in the intake channel 1 to humidify the air and promote the mineralization reaction.

[0056] In this embodiment, a dust removal system 4 is arranged in the outlet channel to filter the dust in the tail gas.

[0057] In this embodiment, a blower is arranged in the intake channel 1 and an induced draft fan 5 is arranged in the outlet channel to make the air and the absorption modules 7 in gas-solid countercurrent contact.

[0058] In this embodiment, 10 layers of square-tray absorbent carrier trays 10 are arranged at intervals on both inner sides of the absorption module 7, with a spacing of 5 - 20 cm between each layer. It has a strong loading capacity, high CO2 absorption efficiency, and reduces the workload of loading and unloading absorbents.

[0059] In this embodiment, the absorbent carrier tray 10 is inclined so that the absorbent feeding system 3 can add absorbents layer by layer from top to bottom into the absorbent carrier tray 10.

[0060] In this embodiment, openings are provided at the bottom and sides of the absorbent carrier tray 10 to increase the air permeability.

[0061] In this embodiment, the air temperature is 11 - 20 °C, the relative humidity is 10% - 25%, and the water content in the air is maintained at 3.3 - 4 g / kg (air) through the humidification system 9; the volume concentration of CO2 in the air is 420 ppm.

[0062] In this embodiment, the CO2 content in the tail gas can be quantified by an on-line CO2 detector, and the detector model is KERNO MOT500 - CO2 - LH.

[0063] In this embodiment, the internal size of the absorption channel is 1.6 m * 1.6 m * 14 m.

[0064] In this embodiment, the size of the absorption module 7 is 1.5 m * 1.5 m * 1.5 m.

[0065] In this embodiment, the absorption module conveying system 8 is a belt conveyor.

[0066] This embodiment also provides a method for mineralizing carbon dioxide in air, including the following steps:

[0067] S1. Mash the carbide slag and make it into spherical particles with a diameter of 1 - 3 mm through a disk granulator, and only add water during the granulation process; add the spherical carbide slag into the absorbent carrier tray 10 of the absorption module 7 through the absorbent feeding system 3, with a loading thickness of 10 mm and a total of 10 layers loaded;

[0068] S2. Eight absorption modules 7 are distributed in the absorption channel after being transported by the absorption module conveying system 8;

[0069] S3. Pass air at a flow rate of 8.76 km 3 / h. The air is humidified by the humidification system 9 in the intake channel 1 and then transported into the absorption channel. The CO2 in the air comes into contact with the absorbent in the absorption module 7 in the absorption channel, and a mineralization reaction occurs; after absorption reaches the balance of new and old replacement, the residence time of each absorption module 7 in the channel is 70 hours, the CO2 absorption rate in the air reaches 82%, and the conversion rate of calcium hydroxide in the carbide slag is 81%;

[0070] S4. Seal the absorbent after the mineralization reaction (for use in mine backfill, roadbeds, etc.).

[0071] In this embodiment, the following steps are further included: Remove an absorption module 7 from the outlet 2 of the absorption module at regular intervals. At the same time, move an absorption module 7 distance through the absorption module conveying system 8 to the outlet 2 of the absorption module, then supplement an empty absorption module 7 at the inlet 6 of the absorption module, and add the absorbent through the feeding system 3.

[0072] In this embodiment, the moving mode of the absorption module conveying system can be slow movement or intermittent movement.

[0073] Embodiment 2

[0074] This embodiment is basically the same as Embodiment 1, except for steps S1 - S3:

[0075] S1. Mash the carbide slag and make it into spherical particles with a diameter of 1 - 3 mm through a disk granulator, and only add water during the granulation process; Add the spherical carbide slag into the absorbent carrier tray 10 of the absorption module 7 through the absorbent feeding system 3, with a filling thickness of 15 mm, and a total of 10 layers are filled;

[0076] S2. Eight absorption modules 7 are distributed in the absorption channel after being transported through the absorption module conveying system 8;

[0077] S3. Pass air at a flow rate of 11.2 km 3 / h. The air is humidified by the humidification system 9 in the intake channel 1 and then transported into the absorption channel. CO2 in the air contacts the absorbent in the absorption module 7 in the absorption channel, and a mineralization reaction occurs; After absorption reaches the balance of new and old replacement, the residence time of each module in the channel is 82 hours, the CO2 absorption rate in the air reaches 90%, and the conversion rate of calcium hydroxide in the carbide slag is 89%.

[0078] Embodiment 3

[0079] This embodiment is basically the same as Embodiment 1, except for steps S1 - S3:

[0080] S1. Mash the carbide slag and make it into spherical particles with a diameter of 2 - 4 mm through a disk granulator, and use a polyacrylamide aqueous solution of one ten-thousandth as a wetting agent during the granulation process; Add the granular carbide slag into the absorbent carrier tray 10 of the absorption module 7 through the absorbent feeding system 3, with a filling thickness of 20 mm, and a total of 10 layers are filled;

[0081] S2. Eight absorption modules 7 are distributed in the absorption channel after being transported through the absorption module conveying system 8;

[0082] S3. At a flow rate of 11.4 km3 Air is introduced at a flow rate of / h. After being humidified by the humidification system 9 in the intake passage 1, the air is transported into the absorption passage. The CO2 in the air comes into contact with the absorbent in the absorption module 7 in the absorption passage, and a mineralization reaction occurs. After absorption reaches the balance of new and old replacement, the residence time of each module in the passage is 108 hours, the CO2 absorption rate in the air reaches 79%, and the total conversion rate of calcium hydroxide in the carbide slag is 78%.

[0083] Example 4

[0084] This example is basically the same as Example 1, except for steps S1 - S3:

[0085] S1. The carbide slag is crushed and made into spherical particles with a diameter of 2 - 4 mm by a disk granulator. During the granulation process, an aqueous solution of ethyl cellulose at a concentration of two ten-thousandths is used as a wetting agent. The granular carbide slag is added to the absorbent carrier tray 10 of the absorption module 7 through the absorbent feeding system 3, with a filling thickness of 25 mm and a total of 10 layers filled.

[0086] S2. Eight absorption modules 7 are distributed in the absorption passage after being transported by the absorption module conveying system 8.

[0087] S3. Air is introduced at a flow rate of 12.3 km 3 / h. After being humidified by the humidification system 9 in the intake passage 1, the air is transported into the absorption passage. The CO2 in the air comes into contact with the absorbent in the absorption module 7 in the absorption passage, and a mineralization reaction occurs. After absorption reaches the balance of new and old replacement, the residence time of each module in the passage is 130 hours, the CO2 absorption rate in the air reaches 70%, and the conversion rate of calcium hydroxide in the carbide slag is 72%.

[0088] It can be seen from Examples 1 - 4 that: when using the system of the present invention to mineralize the CO2 in the air, after absorbing the CO2 in the air for 70 - 110 hours, the CO2 absorption rate in the air can reach 90%, and the mineralization rate of the absorbent can reach 89%.

[0089] Comparative Example 1

[0090] This comparative example is basically the same as Example 1, except for steps S1 - S3:

[0091] S1. The carbide slag is crushed and directly spread on the horizontally arranged carrier tray in the absorption module 7, with a filling thickness of 1.5 mm and a total of 40 layers filled.

[0092] S2. Eight absorption modules 7 are distributed in the absorption passage after being transported by the absorption module conveying system 8.

[0093] S3. Air is introduced at a flow rate of 8.6 km 3Air is introduced at a flow rate of / h. After being humidified by the humidification system 9 in the intake channel 1, the air is transported into the absorption channel. The CO2 in the air comes into contact with the absorbent in the absorption module 7 in the absorption channel, and a mineralization reaction occurs. After absorption reaches the balance of new and old replacement, the residence time of each module in the channel is 40 hours, the CO2 absorption rate in the air reaches 70%, and the conversion of calcium hydroxide in the carbide slag is 82%.

[0094] Comparative Example 2

[0095] This comparative example is basically the same as Example 1, with the differences in steps S1 - S3 as follows:

[0096] S1. The crushed carbide slag is directly spread on the horizontally arranged carrier plate in the absorption module 7, with a filling thickness of 5 mm and a total of 40 layers filled.

[0097] S2. Eight absorption modules 7 are distributed in the absorption channel after being transported by the absorption module conveying system 8.

[0098] S3. Air is introduced at a flow rate of 6.7 km 3 / h. After being humidified by the humidification system 9 in the intake channel 1, the air is transported into the absorption channel. The CO2 in the air comes into contact with the absorbent in the absorption module 7 in the absorption channel, and a mineralization reaction occurs. After absorption reaches the balance of new and old replacement, the residence time of each module in the channel is 201 hours, the CO2 absorption rate in the air reaches 67%, and the conversion of calcium hydroxide in the carbide slag is 73%.

[0099] When the carbide slag is spread flat in a powder state, the conversion rate of the carbide slag is determined by the carbide slag at the bottom layer. The thicknesses of 1.5 mm with the least influence and 5 mm with a greater influence are selected for comparison. Combining the results of Comparative Examples 1 - 2, it can be seen that when the filling thickness exceeds 1.5 mm, the conversion rate of the bottom layer becomes lower and lower, resulting in more time required to mineralize the same amount of carbide slag.

[0100] Comparative Example 3

[0101] The crushed carbide slag is directly spread on the horizontally arranged carrier plate in the absorption module 7, with a filling thickness of 1.5 mm and a total of 20 layers filled. Twenty-four absorption modules are combined into a 9m * 6m * 1.5m array and directly placed in the factory building. The factory building is a 10m * 8m * 15m space, equipped with two axial fans to replace the air in the factory building to keep enough CO2 in the factory building to mineralize the carbide slag in the bearing module. A water mist cannon is installed at the air inlet of the factory building to humidify the air, so that the water content in the air reaches 3.3 - 4 g / kg (air). The power of the axial fan is 0.75 kW, and each axial fan can provide 8.7 km 3 / h air volume, and a total of 17.4 km 3 / h air volume. After 48 hours of absorption, the conversion of calcium hydroxide in carbide slag is 85%.

[0102] It can be seen from Comparative Example 3 that for the mineralization treatment with the absorption module 7 placed in the natural ventilation state in the plant building, when the carbide slag is laid flat with a thickness of 1.5 mm (the least affected by thickness), 24 absorption modules 7 need to be equipped to achieve a conversion of 85% of calcium hydroxide. The amount of absorbent used is large, and the water consumption for capturing and storing CO2 is greatly increased.

[0103] 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 make the essence of the corresponding technical solutions 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, Comprising: An intake system, an absorption channel, a plurality of absorption modules (7), an absorption module conveying system (8), and a humidification system (9); The intake system can make air flow from the intake end of the absorption channel to the outlet end; An absorption module outlet (2) is provided on one side of the absorption channel near its intake end, and an absorption module inlet (6) is provided on one side of the absorption channel near its outlet end; The absorption module (7) is placed in the absorption channel. The absorption module (7) is filled with an absorbent. The absorbent is spherical particles made by crushing carbide slag and then granulating. The particle size of the absorbent is 1 - 6 mm; binders and wetting agents are added during granulation; the binder is one or more of starch, gelatin, carrageenan, gum arabic, ethyl cellulose, sodium carboxymethyl cellulose, methyl cellulose, PVA, polyacrylamide; the wetting agent is one of water, ethyl cellulose aqueous solution, and polyacrylamide aqueous solution; The absorption module conveying system (8) is located in the absorption channel and is used to convey the absorption module (7) between the absorption module inlet (6) and the absorption module outlet (2); a plurality of absorbent bearing trays (10) are spaced apart on both inner sides of the absorption module (7), and the absorbent bearing trays (10) are inclined; The humidification system (9) is located at the intake end of the absorption channel.

2. The system for mineralizing carbon dioxide in air according to claim 1, wherein Also comprising: An absorbent feeding system (3); The absorbent feeding system (3) is arranged on the absorption channel and is located above the absorption module inlet (6).

3. The system for mineralizing carbon dioxide in air according to claim 2, wherein, The absorbent feeding system (3) stores an absorbent, and the absorbent is spherical carbide slag.

4. The system for mineralizing carbon dioxide in air according to claim 1, wherein The intake system comprises: an intake channel (1) and an outlet channel; the intake channel (1) is connected to the intake end of the absorption channel, and the outlet channel is connected to the outlet end of the absorption channel.

5. The system for mineralizing carbon dioxide in air according to claim 4, characterized in that, A blower is provided in the intake channel (1), and an induced draft fan (5) is provided in the outlet channel.

6. The system for mineralizing carbon dioxide in air according to claim 4, wherein A humidification system (9) is provided in the intake channel (1), and a dust removal system (4) is provided in the outlet channel.

7. A method for mineralizing carbon dioxide in air using the system according to any one of claims 1-6, characterized in that, Comprising the following steps: S1. Add the absorbent to the absorption module (7); S2. A plurality of absorption modules (7) are distributed in the absorption channel after being conveyed by the absorption module conveying system (8); S3. Air is humidified by the humidification system (9) and then conveyed into the absorption channel. CO2 in the air comes into contact with the absorbent in the absorption module (7) in the absorption channel, and a mineralization reaction occurs; S4. The absorbent after the mineralization reaction is subjected to a sequestration treatment.

8. The method for mineralizing carbon dioxide in air by the system according to claim 7, characterized in that, Also comprising the following steps: Remove an absorption module (7) from the absorption module outlet (2) every once in a while, and at the same time, move a distance of one absorption module (7) through the absorption module conveying system (8) towards the absorption module outlet (2), then supplement an empty absorption module (7) at the absorption module inlet (6), and add the absorbent through the feeding system (3).

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