Acid soil improvement system and method based on carbon dioxide capture

Abstract

The invention relates to the field of carbon gas fertilizers, and provides an acid soil improvement system and improvement method based on carbon dioxide capture by carbon, the improvement system comprises: a carbon capture device for capturing carbon dioxide discharged by industrial production; the carbonate synthesis device is filled with an alkaline solution, and the alkaline solution is used for synthesizing a carbonate solution with carbon dioxide; the drainage device is used for releasing the carbonate solution into the acid soil, so that the carbonate solution reacts with acid radical ions in the acid soil to generate neutral salt and carbon dioxide. The drainage device releases the carbonate solution into the acid soil, so that the carbonate solution reacts with acid radical ions in the acid soil to generate neutral salt and carbon dioxide needed by plant growth, plant growth can be promoted, the yield of agricultural products is increased, and the quality of the agricultural products is improved; in addition, carbon dioxide generated in the industrial production process is effectively utilized, carbon dioxide discharged from the industry can be consumed, and carbon reduction in the true sense is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon gas fertilizer, and in particular to an acidic soil improvement system and improvement method based on carbon capture of carbon dioxide. Background Art

[0002] As we all know, excessive carbon dioxide emissions are the main factor causing climate change. Although everyone is working hard to reduce carbon emissions, carbon dioxide emissions continue to grow due to the serious imbalance between carbon emissions and carbon sinks. Carbon capture is the process of collecting carbon dioxide produced by large power plants and storing it in various ways to avoid its release into the atmosphere.

[0003] In the prior art, most of the acidic soils are distributed in areas rich in water and heat resources, which have great potential for growing agricultural products. However, due to the common characteristics of acidic soils such as acid-toxicity-poorness, its potential for growing crops cannot be realized. Acidity and alkalinity are the inherent properties of the soil itself. It is a comprehensive reflection of the various chemical properties occurring in the soil. The pH value is usually used to represent the acidity and alkalinity of the soil. Soil acidification refers to the phenomenon that the pH value of the soil decreases under natural or artificial conditions, which is an important manifestation of soil degradation. The concentration of hydrogen ions in the soil solution determines the acidity of the soil. When the soil pH value is less than 6.5, it can be considered as acidic soil, among which the soil pH value between 5.5 and 6.5 is weakly acidic soil, the soil in the range of 5.0 to 5.5 is acidic soil, and the soil with a pH value of <5.0 is strongly acidic soil. Soil acidification will lead to the loss of beneficial elements in the soil that are beneficial to the growth and development of crops, increase the solubility of harmful heavy metal compounds, and make them more easily absorbed by crops, deteriorate the soil structure, and reduce fertility, which seriously restricts local food security, food safety and sustainable development of agriculture.

[0004] As we all know, the basic elements for the growth of green plants are water and carbon dioxide. Under light conditions, they synthesize carbohydrates through photosynthesis in plant chloroplasts and release oxygen. Carbon dioxide is an important raw material for plant photosynthesis. According to measurements, each gram of organic matter synthesized by green plants needs to absorb 1.6 grams of carbon dioxide, which is 40 times that of other substances. 90% of the dry matter accumulated by plants comes from photosynthetic products, which shows the importance of carbon dioxide to plants.

[0005] However, since carbon dioxide is a colorless, odorless gas, it is often ignored when it cannot be seen or touched in the air, especially for crops grown in plant factories. For crops grown in plant factories, if it is winter, in order to keep warm, the doors and windows are closed and airtight. After the sun comes out, due to the enhanced photosynthesis of crops, the concentration of carbon dioxide in the greenhouse drops rapidly, and fresh air cannot enter the outdoors. When the concentration of carbon dioxide in the greenhouse drops to about 100PPm, although there is sufficient sunlight and the roots of the plants absorb enough water, there is not enough carbon dioxide. Plants cannot carry out photosynthesis, and they suffer from carbon dioxide "starvation", which seriously affects their growth and development, resulting in reduced yield and quality. Therefore, it is particularly important to supplement carbon during plant growth.

[0006] In order to solve the problem of carbon supplementation during plant growth, natural ventilation and traditional application of carbon dioxide fertilizer are currently used to supplement carbon. However, natural ventilation cannot achieve accurate application of carbon dioxide fertilizer through control and regulation; traditional application of carbon dioxide fertilizer mainly involves chemical method, combustion method, biological decomposition method, etc., which cannot achieve real carbon reduction. Summary of the invention

[0007] The present invention provides an acidic soil improvement system and improvement method based on carbon capture of carbon dioxide, which is used to solve the defect in the prior art that acidic soil is not conducive to plant growth, realizes the use of carbon capture of carbon dioxide to synthesize carbonate to improve acidic soil, and releases carbon dioxide as carbon gas fertilizer required for plant growth, which can not only promote plant production, but also effectively utilize the carbon dioxide generated in the industrial production process.

[0008] The present invention provides an acidic soil improvement system for carbon capture of carbon dioxide, comprising:

[0009] Carbon capture devices, used to capture carbon dioxide emitted by industrial production;

[0010] A carbonate synthesis device, containing an alkaline solution, wherein the alkaline solution is used to synthesize a carbonate solution with the carbon dioxide;

[0011] The drainage device is used to release the carbonate solution into the acidic soil so that the carbonate solution reacts with the acid radical ions in the acidic soil to generate neutral salt and carbon dioxide.

[0012] According to the present invention, an acidic soil improvement system for carbon capture of carbon dioxide also includes:

[0013] A storage device is arranged between the carbonate synthesis device and the drainage device, and is used to store the carbonate solution.

[0014] According to an acidic soil improvement system for carbon capture of carbon dioxide provided by the present invention, the carbon capture device comprises:

[0015] Desulfurization and denitrification equipment, used for desulfurization and denitrification of carbon dioxide emitted from industrial production;

[0016] A first flue gas cooler is arranged downstream of the desulfurization and denitration equipment, and the flue gas cooler is used to cool the carbon dioxide after desulfurization and denitration;

[0017] an absorption device, disposed downstream of the first flue gas cooler, and the absorption device is used to absorb the cooled carbon dioxide;

[0018] a second flue gas cooler, disposed downstream of the absorption device, and used for cooling the absorbed carbon dioxide again;

[0019] The gas-liquid separator is arranged downstream of the second flue gas cooler and is used to perform gas-liquid separation on the carbon dioxide after re-cooling to obtain pure carbon dioxide gas.

[0020] According to an acidic soil improvement system for carbon capture of carbon dioxide provided by the present invention, the absorption device comprises:

[0021] an absorption tower, disposed downstream of the first flue gas cooler, the absorption tower being used for preliminary absorption of the cooled carbon dioxide;

[0022] a heat exchanger disposed downstream of the absorption tower, the absorption tower being used to perform heat exchange on the initially absorbed carbon dioxide;

[0023] A regeneration tower is arranged downstream of the heat exchanger, and is used to absorb the carbon dioxide after the heat exchange again; and the second flue gas cooler is arranged downstream of the regeneration tower.

[0024] According to the acidic soil improvement system for carbon capture of carbon dioxide provided by the present invention, the alkaline solution includes at least one of sodium hydroxide solution, potassium hydroxide solution or ammonia water.

[0025] According to the acidic soil improvement system for carbon capture of carbon dioxide provided by the present invention, a flow regulating valve is provided on the drainage device, and the flow regulating valve is used to adjust the speed at which the carbonate solution flows into the acidic soil.

[0026] According to the acidic soil improvement system for carbon capture of carbon dioxide provided by the present invention, the drainage device includes a sprinkler or a drip irrigation belt.

[0027] The present invention also provides an acidic soil improvement method for carbon capture of carbon dioxide, comprising:

[0028] Using carbon capture devices to capture carbon dioxide emitted by industrial production;

[0029] Passing the captured carbon dioxide into an alkaline solution to generate a carbonate solution;

[0030] Determine whether the soil pH is too acidic;

[0031] If so, draining the carbonate solution into the soil;

[0032] If not, then end.

[0033] According to a method for improving acidic soil for carbon capture of carbon dioxide provided by the present invention, the carbonate solution is drained into the soil, comprising:

[0034] The carbonate solution is applied to the soil around the roots of the plants by drip irrigation or spraying.

[0035] According to a method for improving acidic soil by capturing carbon dioxide provided by the present invention, the carbon capture device is used to capture carbon dioxide emitted from industrial production, comprising:

[0036] The carbon dioxide gas emitted from industrial production is desulfurized and denitrified, then cooled in the flue gas cooler and enters the absorption tower;

[0037] The carbon dioxide is absorbed by an absorbent in an absorption tower, and the carbon dioxide absorbed by the absorbent in the absorption tower is reabsorbed by a heat exchanger and a regeneration tower;

[0038] The reabsorbed carbon dioxide is cooled by a cooler and sent through a gas-liquid separator to obtain pure carbon dioxide gas.

[0039] The acidic soil improvement system and improvement method based on carbon capture of carbon dioxide provided by the present invention captures carbon dioxide emitted by industrial production through a carbon capture device, an alkaline solution is contained in a carbonate synthesis device, the alkaline solution and carbon dioxide are combined to synthesize a carbonate solution, and a drainage device releases the carbonate solution into the acidic soil, so that the carbonate solution reacts with acid radical ions in the acidic soil to generate neutral salt and carbon dioxide required for plant growth. This can not only promote plant growth and improve the yield and quality of agricultural products, but also effectively utilize the carbon dioxide generated in the industrial production process, and can consume the carbon dioxide emitted by the industry, thereby achieving carbon reduction in a true sense. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0041] Figure 1 is a schematic structural diagram of an acidic soil improvement system based on carbon capture of carbon dioxide according to an embodiment of the present invention;

[0042] Figure 2 is a schematic diagram of the specific structure of the carbon capture device according to an embodiment of the present invention;

[0043] Figure 3 is a flow chart of an acidic soil improvement method based on carbon capture of carbon dioxide according to an embodiment of the present invention;

[0044] Reference numerals:

[0045] 1. Carbon capture device; 2. Carbonate synthesis device; 3. Drainage device; 4. Storage device; 11. First flue gas cooler; 12. Absorption equipment; 13. Second flue gas cooler; 14. Gas-liquid separator; 121. Absorption tower; 122. Heat exchanger; 123. Regeneration tower; 124. Rich liquid pump; 125. Lean liquid pump; 126. Steam refilter. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0048] Combine the following Figure 1 and Figure 2 The acidic soil improvement system based on carbon capture of carbon dioxide of the present invention is described, which comprises a carbon capture device 1, a carbonate synthesis device 2 and a drainage device 3.

[0049] The carbon capture device 1 is used to capture carbon dioxide emitted by industrial production, mainly by capturing carbon dioxide from the emission source and converting it into a harmless or storable form to avoid or reduce greenhouse gas emissions. The carbonate synthesis device 2 contains an alkaline solution, and the alkaline solution reacts with carbon dioxide to synthesize a carbonate solution; the drainage device 3 is used to release the carbonate solution into the acidic soil, so that the carbonate solution reacts with the acid ions in the acidic soil to generate neutral salts and carbon dioxide, which can improve the acidic soil, not only promote plant production, improve the yield and quality of agricultural products, but also effectively utilize the carbon dioxide generated in the industrial production process, and can absorb the carbon dioxide emitted by the industry, achieving real emission reduction.

[0050] It should be noted that the acidic soil may be the acidic soil known per se, or may be the acidic soil detected by any instrument or device.

[0051] In a feasible embodiment of the present invention, a storage device 4 is further included. The storage device 4 is arranged between the carbonate synthesis device 2 and the drainage device 3. The storage device 4 is used to store carbonate solution. When the output of carbon dioxide is greater than the demand for carbon dioxide, the storage device 4 can temporarily store the carbonate solution. The storage device 4 can be manufactured by selecting suitable materials according to the characteristics and application scenarios of the carbonate solution. The size and capacity of the storage device 4 are determined according to the production capacity and application scenarios of the carbonate synthesis device 2. The storage device 4 should be large enough to accommodate enough carbonate solution, and the transportation and installation restrictions of the storage device 4 should also be considered.

[0052] like Figure 2 As shown, in one embodiment of the present invention, the carbon capture device 1 includes a desulfurization and denitrification device, a first flue gas cooler 11, an absorption device 12, a second flue gas cooler 13 and a gas-liquid separator 14. The desulfurization and denitrification device is used to desulfurize and denitrify carbon dioxide emitted from industrial production. The desulfurization and denitrification device mainly uses chemical or physical methods to convert sulfur dioxide and nitrogen oxides in flue gas into harmless or storable forms. This device can be applied to various emission sources. The first flue gas cooler 11 is arranged downstream of the desulfurization and denitrification device, and the first flue gas cooler 11 is used to cool the carbon dioxide after desulfurization and denitrification. The absorption device 12 is arranged downstream of the first flue gas cooler 11, and the absorption device 12 is used to absorb the cooled carbon dioxide. The second flue gas cooler 13 is arranged downstream of the absorption device 12, and the second flue gas cooler 13 is used to cool the absorbed carbon dioxide again; the gas-liquid separator 14 is arranged downstream of the second flue gas cooler 13, and is used to separate the carbon dioxide after recooling into gas and liquid to obtain pure carbon dioxide gas, thereby realizing carbon capture.

[0053] See again Figure 2As shown, in one embodiment of the present invention, the absorption equipment 12 may include an absorption tower 121, a heat exchanger 122 and a regeneration tower 123. The absorption tower 121 is arranged downstream of the first flue gas cooler 11, and the absorption tower 121 is used for the preliminary absorption of the cooled carbon dioxide; the heat exchanger 122 is arranged downstream of the absorption tower 121, and the absorption tower 121 is used for heat exchange of the preliminarily absorbed carbon dioxide; the regeneration tower 123 is arranged downstream of the heat exchanger 122, and the regeneration tower 123 is used for re-absorbing the carbon dioxide after the heat exchange; and a second flue gas cooler 13 is arranged downstream of the regeneration tower 123.

[0054] In addition, a rich liquid pump 124 may be further included. The rich liquid pump 124 is disposed between the absorption tower 121 and the heat exchanger 122. The rich liquid pump 124 pumps the carbon dioxide-rich solution at the outlet of the absorption tower 121 to the heat exchanger 122 for cooling.

[0055] A lean liquid pump 125 may also be included. The lean liquid pump 125 is arranged between the regeneration tower 123 and the heat exchanger 122 to pump the desorbed carbon dioxide flowing out of the regeneration tower 123 to the heat exchanger 122 through the lean liquid pump 125 for heating and thermal decomposition to release carbon dioxide, which is then returned to the absorption tower 121 for reuse.

[0056] A low-pressure steam refilter 126 may also be included, which is connected to the regeneration tower 123. The low-pressure steam refilter 126 uses low-pressure steam to heat the melt in the regeneration tower 123 to release carbon dioxide through pyrolysis.

[0057] In one embodiment of the present invention, the alkaline solution may include one of a sodium hydroxide solution, a potassium hydroxide solution or an ammonia solution. When the alkaline solution includes a sodium hydroxide solution, the carbonate generated by the reaction of carbon dioxide and the sodium hydroxide solution is a sodium carbonate solution; when the alkaline solution includes a potassium hydroxide solution, the carbonate generated by the reaction of carbon dioxide and the potassium hydroxide solution is a potassium carbonate solution; when the alkaline solution is an ammonia solution, the carbonate generated by the reaction of carbon dioxide and the ammonia solution is an ammonium carbonate solution.

[0058] In another embodiment, the alkaline solution may also include two or three of sodium hydroxide solution, potassium hydroxide solution and ammonia water. When the alkaline solution is a mixture of sodium hydroxide solution and potassium hydroxide solution, the corresponding carbonate solution generated is a mixture of sodium carbonate solution and potassium carbonate solution. Similarly, when the alkaline solution is a mixture of sodium hydroxide solution and ammonia water, the corresponding carbonate solution generated is sodium carbonate solution and ammonium carbonate solution. When the alkaline solution is a mixture of potassium hydroxide solution and ammonia water, the corresponding carbonate solution generated is potassium carbonate solution and ammonium carbonate solution. When the alkaline solution is a mixture of sodium hydroxide solution, potassium hydroxide solution and ammonia solution, the corresponding carbonate solution generated is sodium carbonate solution, potassium carbonate solution and ammonium carbonate solution.

[0059] In one embodiment of the present invention, a flow regulating valve is provided on the drainage device 3, and the flow regulating valve is used to adjust the speed at which the carbonate solution flows into the acidic soil. The flow regulating valve can be used to control the flow of the carbonate solution to accurately improve the acidity of the acidic soil and increase the application of carbon dioxide gas fertilizer during the improvement process, thereby promoting plant growth and improving the yield and quality of agricultural products.

[0060] In one embodiment of the present invention, the drainage device 3 includes a sprinkler or a drip irrigation belt, and the carbonate solution is introduced into the acidic soil through the sprinkler or drip irrigation.

[0061] Combine the following Figure 3 The acidic soil improvement method based on carbon capture of carbon dioxide provided by the present invention is described. The acidic soil improvement method based on carbon capture of carbon dioxide described below and the acidic soil improvement device based on carbon capture of carbon dioxide described above can correspond to each other.

[0062] like Figure 3 As shown, the second embodiment of the present invention is to protect a soil improvement method based on carbon capture of carbon dioxide, using the soil improvement system based on carbon capture of carbon dioxide as described in any of the above embodiments, comprising:

[0063] S110, Carbon capture of carbon dioxide emitted from industrial production;

[0064] S120, passing the captured carbon dioxide into an alkaline solution to generate a carbonate solution;

[0065] S130, determining whether the soil pH value is too acidic;

[0066] S131. If yes, drain the carbonate solution into the soil;

[0067] S132: If no, then end.

[0068] In step S120, step S121 may also be included, storing the prepared carbonate solution, which may be stored in a storage device.

[0069] In a feasible embodiment of the present invention, in step S131, draining the carbonate solution into the soil includes:

[0070] The carbonate solution is dripped or sprayed on the soil at the roots of plants to ensure a more uniform improvement effect on acidic soil.

[0071] In a feasible embodiment of the present invention, in step S110, carbon capture of carbon dioxide emitted from industrial production includes:

[0072] The carbon dioxide gas emitted from industrial production is desulfurized and denitrified, then cooled in the flue gas cooler and enters the absorption tower;

[0073] The carbon dioxide is absorbed by an absorbent in an absorption tower, and the carbon dioxide absorbed by the absorbent in the absorption tower is reabsorbed by a heat exchanger and a regeneration tower;

[0074] The reabsorbed carbon dioxide is cooled by a cooler and sent through a gas-liquid separator to obtain pure carbon dioxide gas.

[0075] The acid soil improvement method based on carbon capture of carbon dioxide provided by the present invention uses a carbon capture device to capture carbon dioxide released by industrial production, and the captured carbon dioxide is passed into sodium hydroxide, potassium hydroxide, ammonia water or a mixed solution of two or three thereof to generate sodium carbonate, potassium carbonate, ammonium salt or a mixed solution of sodium carbonate, potassium carbonate and ammonium salt, and stored in a storage tank. It is judged whether the soil where the plant grows is too acidic. If the acidity of the soil needs to be improved, the mixed solution of carbonates in the storage tank is released by drip irrigation or spraying technology, and reacts with the acid radical ions in the soil to generate neutral sodium salts and potassium salts, while releasing carbon dioxide to supplement carbon in the growth process of the plant. Compared with the traditional method of improving acidic soil with organic fertilizers or chemical fertilizers, on the one hand, the acidity of the soil is accurately improved by controlling its flow rate, and carbon dioxide gas fertilizer is added during the improvement process to promote plant growth and improve the yield and quality of agricultural products; on the other hand, the carbon dioxide generated in the industrial production process is effectively utilized, and industrial carbon dioxide emissions can be consumed to achieve carbon reduction in the true sense.

[0076] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0078] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for improving acidic soils based on carbon capture of carbon dioxide, It is characterized in that include: A carbon capture device (1) for capturing carbon dioxide emitted from industrial production; A carbonate synthesis device (2) containing an alkaline solution, wherein the alkaline solution is used to synthesize a carbonate solution with the carbon dioxide; The drainage device (3) is used to release the carbonate solution into the acidic soil, so that the carbonate solution reacts with the acid radical ions in the acidic soil to generate neutral salt and carbon dioxide.

2. The acidic soil improvement system based on carbon capture of carbon dioxide according to claim 1, It is characterized in that Also includes: A storage device (4) is arranged between the carbonate synthesis device (2) and the drainage device (3), and the storage device (4) is used to store the carbonate solution.

3. The acidic soil improvement system based on carbon capture of carbon dioxide according to claim 1, It is characterized in that The carbon capture device (1) comprises: Desulfurization and denitrification equipment, used for desulfurization and denitrification of carbon dioxide emitted from industrial production; A first flue gas cooler (11) is arranged downstream of the desulfurization and denitration equipment, and the first flue gas cooler (11) is used to cool the carbon dioxide after desulfurization and denitration; an absorption device (12), arranged downstream of the first flue gas cooler (11), and the absorption device (12) is used to absorb the cooled carbon dioxide; A second flue gas cooler (13) is arranged downstream of the absorption device (12), and the second flue gas cooler (13) is used to cool the absorbed carbon dioxide again; The gas-liquid separator (14) is arranged downstream of the second flue gas cooler (13) and is used to perform gas-liquid separation on the carbon dioxide after re-cooling to obtain pure carbon dioxide gas.

4. The acidic soil improvement system based on carbon capture of carbon dioxide according to claim 3, It is characterized in that The absorption device (12) comprises: an absorption tower (121), disposed downstream of the first flue gas cooler (11), the absorption tower (121) being used for preliminary absorption of the cooled carbon dioxide; a heat exchanger (122), disposed downstream of the absorption tower (121), wherein the absorption tower (121) is used to perform heat exchange on the initially absorbed carbon dioxide; A regeneration tower (123) is arranged downstream of the heat exchanger (122), and the regeneration tower (123) is used to absorb the carbon dioxide after the heat exchange again; and the second flue gas cooler (13) is arranged downstream of the regeneration tower (123).

5. The acidic soil improvement system based on carbon capture of carbon dioxide according to claim 1, It is characterized in that The alkaline solution includes at least one of sodium hydroxide solution, potassium hydroxide solution or ammonia solution.

6. The acidic soil improvement system based on carbon capture of carbon dioxide according to claim 1, It is characterized in that The drainage device (3) is provided with a flow regulating valve, and the flow regulating valve is used to adjust the speed at which the carbonate solution flows into the acidic soil.

7. The acidic soil improvement system based on carbon capture of carbon dioxide according to claim 1, It is characterized in that The drainage device (3) comprises a nozzle or a drip irrigation belt.

8. A method for improving acidic soil based on carbon capture of carbon dioxide, using the improvement system according to any one of claims 1 to 7, It is characterized in that include: Carbon capture of carbon dioxide emitted from industrial production; Passing the captured carbon dioxide into an alkaline solution to generate a carbonate solution; Determine whether the soil pH is too acidic; If so, draining the carbonate solution into the soil; If not, then end.

9. The method for improving acidic soil based on carbon capture of carbon dioxide according to claim 8, It is characterized in that Directing the carbonate solution into the soil comprises: The carbonate solution is applied to the soil around the roots of the plants by drip irrigation or spraying.

10. The method for improving acidic soil based on carbon capture of carbon dioxide according to claim 8, It is characterized in that The carbon dioxide emitted by the carbon capture industry includes: The carbon dioxide gas emitted from industrial production is desulfurized and denitrified, then cooled in the flue gas cooler and enters the absorption tower; The carbon dioxide is absorbed by an absorbent in an absorption tower, and the carbon dioxide absorbed by the absorbent in the absorption tower is reabsorbed by a heat exchanger and a regeneration tower; The reabsorbed carbon dioxide is cooled by a cooler and sent through a gas-liquid separator to obtain pure carbon dioxide gas.

Images