Carbon dioxide enrichment system and carbon dioxide enrichment method

Abstract

A carbon dioxide enrichment system according to exemplary embodiments of the present invention can effectively collect carbon dioxide in the atmosphere to supply same to a plant cultivation facility. Accordingly, the efficiency of carbon dioxide enrichment can be improved.

Description

Carbon dioxide fertilization system and carbon dioxide fertilization method

[0001] The present invention relates to a carbon dioxide fertilization system and a carbon dioxide fertilization method.

[0002] More specifically, the present invention relates to a carbon dioxide fertilization system and a carbon dioxide fertilization method that can directly capture carbon dioxide in the atmosphere and supply it to horticultural facilities or agricultural facilities.

[0003] Carbon dioxide fertilization for crop production is mainly done by using liquid carbon dioxide or burning fossil fuels to supply carbon dioxide, thereby maintaining an appropriate carbon dioxide concentration for each crop type.

[0004] Liquefied carbon dioxide (LCCO) is used by capturing CO2 from byproduct gas or power plants, refining it, compressing and liquefying it, and transporting it for use. High costs, not only for capture but also for liquefaction and transport, are unavoidable.

[0005] Combusting fossil fuels to produce carbon dioxide is relatively economical during the winter months when heating is needed. However, heating is primarily needed at night, while carbon dioxide fertilization must primarily occur during the day, creating a time mismatch. Furthermore, while there are methods for storing the heat generated during combustion for use at night, these methods are still considered inefficient due to energy conversion issues.

[0006] To solve the above problems, research is ongoing on carbon dioxide fertilization systems that can directly capture carbon dioxide from the atmosphere and supply it to plant plants such as greenhouses or agricultural facilities.

[0007] (Patent Document 1) Republic of Korea Patent Publication No. 10-2013-0083217.

[0008] The technical idea of ​​the present invention is to provide a carbon dioxide fertilization system that can directly capture carbon dioxide from raw gas such as atmospheric air and supply it to a plant.

[0009]

[0010] The objectives of the present invention are not limited to the above-described content. Those skilled in the art will have no difficulty understanding the additional objectives of the present invention from the overall description of the present invention.

[0011] According to exemplary embodiments of the present invention, a carbon dioxide fertilization system is provided. The carbon dioxide fertilization system includes an electrodialysis device configured to separate a salt solution into an acid solution and a base solution, an absorption device configured to react the base solution with a raw material gas containing carbon dioxide and discharge an absorption solution that absorbs the carbon dioxide from the raw material gas, a separation device configured to react the absorption solution and the acid solution to separate and discharge carbon dioxide and a salt solution, and supply the separated and discharged carbon dioxide to a plant plant, a plant plant that receives the carbon dioxide from the separation device, and a control unit configured to control the separated and discharged carbon dioxide based on environmental conditions of the plant plant, wherein the salt solution discharged from the separation device is circulated to the electrodialysis device.

[0012] The above salt solution may include KCl, KNO3, K2SO4 or a combination thereof, and water (H2O).

[0013] The supply temperature of the above salt solution may be 20 to 50°C.

[0014] The acid solution may include HCl, HNO3, H2SO4 or a combination thereof.

[0015] The above base solution may include KOH.

[0016] The above electrodialysis device can discharge a diluted solution having a lower salt concentration than the salt solution and supply the diluted solution to the plant.

[0017] The above electrodialysis device discharges a diluted solution having a lower salt concentration than the salt solution, and the diluted solution can be circulated to the absorption device and the separation device.

[0018] The above electrodialysis device may be a bipolar electrodialysis device including a bipolar membrane.

[0019] The above control unit may be configured to determine whether to operate the electrodialysis device according to the environmental conditions of the plant.

[0020] The above control unit may be configured to compare the carbon dioxide concentration in the plant with a preset carbon dioxide concentration to determine whether to operate the electrodialysis device.

[0021] The above carbon dioxide fertilization system further includes an acid solution storage tank fluidly connected to the electrodialysis device and the separation device, and an on-off valve disposed between the acid solution storage tank and the separation device and configured to control the flow of the acid solution supplied to the separation device by an opening and closing operation, and the control unit may be configured to control the opening and closing operation of the on-off valve according to the environmental conditions of the plant.

[0022]

[0023] According to further exemplary embodiments of the present invention, a carbon dioxide fertilization method is provided. The carbon dioxide fertilization method comprises a step of separating carbon dioxide from an absorption solution formed by a reaction between a raw material gas containing carbon dioxide and a base solution and supplying the separated carbon dioxide to a plant plant, the step comprising: a step of determining whether to separate the carbon dioxide based on an environmental condition of the plant plant; a step of supplying the raw material gas and the base solution to an absorption device to form the absorption solution; a step of supplying an acid solution and the absorption solution to a separation device to separate a salt solution and the carbon dioxide from the absorption solution; a step of supplying the salt solution to an electrodialysis device to form the base solution and the acid solution, wherein the base solution is supplied to the absorption device and the acid solution is supplied to the separation device; and a step of supplying the separated carbon dioxide to the plant plant, wherein whether to separate the carbon dioxide can be controlled by the operation of the electrodialysis device or the supply of the acid solution to the separation device.

[0024] The carbon dioxide fertilization system according to exemplary embodiments of the present invention can effectively capture atmospheric carbon dioxide and supply it to plant growth. This can enhance the efficiency of carbon dioxide fertilization.

[0025]

[0026] The various advantageous and beneficial effects of the present invention are not limited to the above-described contents, and will be more easily understood in the course of explaining specific embodiments of the present invention.

[0027] Figure 1 is a process diagram illustrating a carbon dioxide fertilization system according to exemplary embodiments.

[0028] Figure 2 is a schematic diagram illustrating an electrodialysis device.

[0029] FIG. 3 is a process diagram illustrating a carbon dioxide fertilization system according to other exemplary embodiments.

[0030] FIG. 4 is a process diagram illustrating a carbon dioxide fertilization system according to other exemplary embodiments.

[0031] FIG. 5 is a process diagram illustrating a carbon dioxide fertilization system according to other exemplary embodiments.

[0032] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0033] Hereinafter, when explaining with reference to drawings, identical or corresponding components are given the same drawing reference numerals and redundant descriptions thereof are omitted.

[0034] In the examples below, the terms first, second, etc. are not used in a limiting sense, but are used for the purpose of distinguishing one component from another.

[0035] In the examples below, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0036] In the examples below, terms such as “include” or “have” mean that a feature or component described in the specification is present, and do not preclude the possibility that one or more other features or components may be added.

[0037] For convenience of explanation, the sizes of components in the drawings may be exaggerated or reduced. For example, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to what is shown.

[0038] In some embodiments, where implementations are otherwise feasible, specific process sequences may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0039] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0040]

[0041] Figure 1 is a process diagram illustrating a carbon dioxide fertilization system according to exemplary embodiments.

[0042] Referring to FIG. 1, the carbon dioxide fertilization system (1000) includes an electrodialysis device (100), an absorption device (200), a separation device (300), a plant plant (400), and a control unit (500).

[0043]

[0044] An electrodialysis device (100) may be configured to separate a salt solution into an acid solution and a base solution. In the present invention, the salt solution refers to a solution containing an ionic compound produced by an acid-base reaction, and a solution containing a salt having the properties of a strong electrolyte that is largely dissociated in water.

[0045] As a non-limiting example, the pH of a salt solution may be in the pH range of 3 to 5. The pH of a base solution may be greater than or equal to 13. The pH of an acid solution may be less than or equal to 1.

[0046]

[0047] Figure 2 is a schematic diagram for explaining an electrodialysis device (100).

[0048] Referring to FIG. 2, the electrodialysis device (100) may be a bipolar electrodialysis device including a bipolar membrane.

[0049] An electrodialysis device (100) may include a bipolar membrane (BPM), an anion-exchange membrane (AEM), a cation-exchange membrane (CEM), an anode (+), and a cathode (-). In addition, the electrodialysis device (100) may further include a power source (not shown) capable of supplying electricity to separate a salt solution.

[0050] As a non-limiting example, an anode (+) and a cathode (-) may be positioned at opposite ends of an electrodialysis device (100). A bipolar membrane (BPM) may be positioned adjacent to the anode (+) or the cathode (-). The bipolar membrane (BPM) may include a first bipolar membrane (BPM1) positioned adjacent to the anode (+) side and a second bipolar membrane (BPM2) positioned adjacent to the cathode (-) side. An anion exchange membrane (AEM) and a cation exchange membrane (CEM) may be positioned spaced apart from each other by a predetermined distance between the first bipolar membrane (BPM1) and the second bipolar membrane (BPM2). A power source may be electrically connected to the anode (+) and the cathode (-).

[0051] A salt solution may be supplied between an anion exchange membrane (AEM) and a cation exchange membrane (CEM). Water may be supplied between a first bipolar membrane (BPM1) and anion exchange membrane (AEM). Water (e.g., make-up water) may be supplied between a second bipolar membrane (BPM2) and a cation exchange membrane (CEM). As a non-limiting example, a diluted salt solution may be supplied between the first bipolar membrane (BPM1) and anion exchange membrane (AEM). A diluted salt solution may be supplied between the second bipolar membrane (BPM2) and a cation exchange membrane (CEM). At this time, the diluted salt solution may be a diluted salt solution having a relatively low salt concentration. The following description focuses on a case where water is supplied separately from the salt solution.

[0052] By supplying electricity to the electrodialysis device (100), the salt solution can be separated into an acid solution and a base solution. When electricity is supplied to the anode (+) and cathode (-) using a power source, the anions in the electrodialysis device (100) can move toward the anode (+). In addition, the cations in the electrodialysis device (100) can move toward the cathode (-). More specifically, when electricity is applied to the electrodialysis device (100), water (H2O) is converted to hydrogen ions (H) in the bipolar membrane. + ) and hydroxide ions (OH - ) can be decomposed into. The anions contained in the salt solution can pass through the anion exchange membrane (AEM) and combine with hydrogen ions (H+) to form an acid solution. The cations contained in the salt solution can pass through the cation exchange membrane (CEM) and combine with hydroxide ions (OH-) to form a base solution. By the movement of these ions, the salt concentration of the salt solution supplied between the anion exchange membrane (AEM) and the cation exchange membrane (CEM) can be lowered, thereby forming a diluted solution. As a non-limiting example, the salt concentration of the diluted solution can be at the level of 0.05 to 1% of the salt solution.

[0053]

[0054] The supply temperature of the salt solution can be 20 to 50°C.

[0055] If the supply temperature of the salt solution is below 20°C, salt may precipitate within the solution. Furthermore, the salt solution decomposition efficiency of the electrodialysis device (100) may be compromised. If the supply temperature of the salt solution exceeds 50°C, membrane deformation, changes in electrical conductivity, etc. may occur, causing local or overall rapid changes in the pH of the discharged solutions. In this case, stable electrodialysis control may become difficult.

[0056]

[0057] According to exemplary embodiments, the salt solution and the base solution contain potassium ions (K + ) may be included. As a non-limiting example, the salt solution may include KCl, KNO3, K2SO4, or a combination thereof, and water (H2O). The base solution may include KOH. The dilute solution may be composed substantially identically to the salt solution except for the salt concentration.

[0058] Carbon dioxide can be transported in the form of carbonate by reacting with a base solution. Carbonate is carbonate (CO3 2- ), and bicarbonate (HCO3 - ) can be one or more of the following. In the past, a base solution containing NaOH was mainly used as a base solution for direct carbon dioxide capture. Sodium (Na +) ions can be easily obtained through electrolysis of seawater, etc. When capturing carbon dioxide with NaOH, carbon dioxide is stored in the form of Na2CO3 or NaHCO3. However, due to the low solubility of NaHCO3, it was difficult to increase the salt concentration, which resulted in low carbon dioxide capture efficiency. This resulted in a problem where the amount of carbon dioxide that could be captured per weight of base solution was low, lowering the efficiency of the process. In addition, when used in regions with cold climates, the problem of precipitation in the form of crystals may occur.

[0059] When carbon dioxide is captured using a base solution according to exemplary embodiments of the present invention, the carbon dioxide can be absorbed in the form of K2CO3 or KHCO3. Since salts (K2CO3 or KHCO3) containing such potassium ions (K+) have higher solubility than NaHCO3, a greater amount of carbon dioxide can be captured per weight of the base solution.

[0060] According to exemplary embodiments, the base solution can react with carbon dioxide to absorb carbon dioxide from the raw material gas as shown in the following reaction formulas.

[0061] [Reaction Formula 1]

[0062] 2KOH + CO2→ K2CO3+ H2O

[0063] [Reaction Formula 2]

[0064] K2CO3+ CO2+ H2O → 2KHCO3

[0065]

[0066] The base solution may contain 5 to 25 wt% KOH based on the total weight of the base solution. If the KOH content in the base solution is less than 5 wt%, the carbon dioxide absorption efficiency may be poor. As the KOH efficiency of the base solution increases, the carbon dioxide absorption efficiency can be improved. However, if the KOH content in the base solution increases excessively, problems such as excessive formation of KHCO3 and the like and precipitation in the form of crystals may occur. The remainder of the base solution, excluding KOH, may contain water (H2O) and unavoidable impurities.

[0067]

[0068] According to exemplary embodiments, the acid solution may include HCl, HNO3, H2SO4, or a combination thereof.

[0069]

[0070] Through the above process, the electrodialysis device (100) can receive a salt solution and discharge a base solution, an acid solution, and a diluted solution.

[0071] According to exemplary embodiments, the electrodialysis device (100) can receive a salt solution from a separation device (300). The electrodialysis device (100) can supply a base solution to an absorption device (200). The electrodialysis device (100) can supply an acid solution to a separation device (300). In this way, by circulating the solutions used within the carbon dioxide fertilization system (1000), the carbon dioxide capture efficiency of the carbon dioxide fertilization system (1000) can be improved.

[0072]

[0073] The absorption device (200) can be configured to absorb carbon dioxide contained in the raw material gas with a base solution and discharge the absorption solution.

[0074] The raw material gas may include exhaust gases from factories surrounding the plant, atmospheric air, or a combination thereof, provided the plant is suitably installed. Non-limiting examples of the raw material gas include power generation exhaust gases, incinerator exhaust gases, steelmaking by-product gases, atmospheric air, or a combination thereof. More specifically, the raw material gas may be atmospheric air.

[0075] In exemplary embodiments, the source gas may include carbon dioxide, nitrogen, carbon monoxide, methane, oxygen, and hydrogen. In one embodiment, the source gas may include about 0.04 to about 30 vol% carbon dioxide based on the total volume of the source gas.

[0076] The absorption device (200) may include inlets (210, 220, 230) through which feeds for carbon dioxide absorption reaction are supplied and outlets (240, 250) through which reaction products are discharged.

[0077] The raw material gas can be supplied to the absorption device (200) through the first inlet (210). The first inlet (210) is not particularly limited as long as it is a means capable of supplying the raw material gas into the absorption device (200). As a non-limiting example, the first inlet (210) may include a blower or a fan.

[0078] A base solution can be supplied to the absorption device (200) through the second inlet (220). The second inlet (220) can be positioned above the first inlet (210). As a result, the base solution supplied to the second inlet (220) flows in the direction of gravity and can absorb carbon dioxide contained in the source gas by coming into contact with the source gas flowing upward from the first inlet (210). The carbon dioxide absorption reaction is as shown in the reaction formula described above. After the reaction between the source gas and the base solution, the absorption solution containing carbon dioxide in the form of a carbonate can flow to the bottom of the absorption device (200), and the exhaust gas from which carbon dioxide has been removed can flow to the top of the absorption device (200). As a non-limiting example, the second inlet (220) can be fluidly connected to a pipe and a spray nozzle extending into the interior of the absorption device (200). The second inlet (220) can be fluidly connected to the electrodialysis device (100) through a pipeline or the like.

[0079] A defoaming agent may be supplied into the absorption device (200) through the third inlet (230). As the raw material gas and the base solution react, foam may be generated inside the absorption device (200). To minimize the generation of such foam, a defoaming agent may be optionally supplied. The third inlet (230) may be located above the first inlet (210). The third inlet (230) may be fluidly connected to a pipe extending into the interior of the absorption device (200) and a spray nozzle. The third inlet (230) may be fluidly connected to an external defoaming agent storage tank (not shown) through a pipeline or the like. As a non-limiting example, the defoaming agent may be added in the middle of a base solution stream flowing from the electrodialysis device (100) to the second inlet (220). In this case, the third inlet (230) may be omitted.

[0080] The first outlet (240) may be configured to discharge the absorption solution. The first outlet (240) may be positioned at the lowermost end of the absorption device (200) to discharge the absorption solution to the outside of the absorption device (200). As a non-limiting example, the first outlet (240) may be a port fluidly connected to the separation device (300) through a pipeline or the like, including a valve or the like. As a non-limiting example, the pH of the absorption solution may be in the pH range of 9 to 11. The absorption solution may include one or more of K2CO3 or KHCO3.

[0081] The second outlet (250) may be configured to discharge the exhaust gas to the outside of the absorption device (200). The second outlet (250) may be positioned at the top of the absorption device (200) to discharge the exhaust gas to the outside of the absorption device (200). The second outlet (250) is not particularly limited as long as it can easily discharge the exhaust gas. As a non-limiting example, the second outlet (250) may include an induced draft fan.

[0082] As a non-limiting example, the absorption device (200) may be any one of a Packing Column, a Tray column, a Spray Column, a Bubble Column, and a combination thereof.

[0083]

[0084] As described above, the absorption device (200) can be supplied with a base solution and a raw material gas and discharge the absorption solution and exhaust gas. If necessary, a defoaming agent may also be supplied. As a non-limiting example, the absorption device (200) can absorb about 30 to about 90% of the carbon dioxide contained in the raw material gas.

[0085] According to exemplary embodiments, the absorption device (200) can receive a base solution from the electrodialysis device (100). The absorption device (200) can supply the absorption solution to the separation device (300).

[0086]

[0087] The separation device (300) can be configured to react the absorption solution and the acid solution to discharge carbon dioxide and a salt solution.

[0088] The absorption solution supplied to the separation device (300) can be supplied from the absorption device (200). The acid solution supplied to the separation device (300) can be supplied from the electrodialysis device (100). For this purpose, the separation device (300) can be fluidly connected to the electrodialysis device (100) and the absorption device (200) through a pipeline including a valve and a pump.

[0089] According to exemplary embodiments, carbon dioxide can be separated by reacting an absorption solution and an acid solution as shown in the following reaction formulas in a separation device (300). In addition, a salt solution can be formed.

[0090] [Reaction Formula 3]

[0091] KHCO3+ HNO3→ KNO3+ H2O + CO2

[0092] [Reaction Formula 4]

[0093] K2CO3+ 2HNO3→ 2KNO3+ 2H2O + CO2

[0094] [Reaction Formula 5]

[0095] KHCO3+ HCl → KCl + H2O + CO2

[0096] [Reaction Formula 6]

[0097] K2CO3+ 2HCl → 2KCl + 2H2O + CO2

[0098] [Reaction Formula 7]

[0099] 2KHCO3+ H2SO4→ K2SO4+ 2H2O + 2CO2

[0100] [Reaction Formula 8]

[0101] K2CO3+ H2SO4→ K2SO4+ H2O + CO2

[0102]

[0103] As described above, the separation device (300) can be supplied with an absorption solution and an acid solution and discharge carbon dioxide and a salt solution.

[0104] According to exemplary embodiments, the separation device (300) can separate at least about 90% of the carbon dioxide contained in the absorption solution. More specifically, the separation device (300) can separate at least about 99% of the carbon dioxide contained in the absorption solution. The carbon dioxide separated from the absorption solution can be discharged from the top of the separation device (300) in a gaseous state.

[0105] The separation device (300) may be configured to supply the separated and discharged carbon dioxide to the plant plant. To this end, the separation device (300) may be fluidly connected to the plant plant (400). As a non-limiting example, the separated and discharged carbon dioxide may be provided to the plant plant (400) using an air duct (not shown) and an air pump (not shown) configured to fluidly connect the separation device (300) and the plant plant (400).

[0106]

[0107] The plant plant (400) can receive carbon dioxide from the separation device (300). The plant plant (400) is not particularly limited as long as it can appropriately cultivate plants, such as crops, of a certain size. As a non-limiting example, the plant plant (400) may be a sealed structure capable of cultivating plants inside. Alternatively, the plant plant (400) may be a vinyl house or a glass greenhouse.

[0108] The plant plant (400) may include a plurality of sensors to sense the environmental conditions of the plant plant (400). The environmental conditions of the plant plant (400) may be one or more of the light intensity, time, and internal carbon dioxide concentration of the plant plant (400) irradiated to the plant plant (400). As an example, the environmental conditions of the plant plant (400) may be the internal carbon dioxide concentration of the plant plant (400).

[0109] As a non-limiting example, the plant plant (400) may include a carbon dioxide concentration sensor. The plant plant (400) may include a light intensity measurement sensor.

[0110]

[0111] The control unit (500) can be configured to control the separation and emission of carbon dioxide based on the environmental conditions of the plant (400).

[0112]

[0113] According to exemplary embodiments, the separation and discharge of carbon dioxide can be controlled by determining whether the electrodialysis device (100) is operating. To this end, the control unit (500) can be configured to determine whether the electrodialysis device (100) is operating based on the environmental conditions of the plant (400).

[0114] The electrodialysis device (100) can be electrically controlled, making it easier to control than the absorption device (200) and the separation device (300). In addition, a base solution for carbon dioxide absorption and an acid solution for carbon dioxide regeneration are produced from the electrodialysis device (100). Therefore, by controlling the electrodialysis device (100), the degree of carbon dioxide absorption by the absorption device (200) and the degree of carbon dioxide emission by the separation device (300) can be controlled, and further, the carbon dioxide concentration in the plant plant (400) can be easily controlled. In addition, the plant growth efficiency of the plant plant (400) can be improved by operating the electrodialysis device (100) only during a time period or under light conditions suitable for plant growth to supply carbon dioxide to the plant plant (400).

[0115]

[0116] According to exemplary embodiments, the control unit (500) may be configured to compare a preset carbon dioxide concentration with the carbon dioxide concentration within the plant (400) to determine whether to operate the electrodialysis device (100).

[0117] As an example, the control unit (500) may stop the operation of the electrodialysis device (100) when the carbon dioxide concentration within the plant (400) is higher than a preset carbon dioxide concentration. More specifically, the control unit (500) may cut off the electricity applied to the electrodialysis device (100) when the carbon dioxide concentration within the plant (400) is higher than a preset carbon dioxide concentration.

[0118] As another example, the control unit (500) may operate the electrodialysis device (100) when the carbon dioxide concentration within the plant (400) is lower than a preset carbon dioxide concentration. More specifically, the control unit (500) may apply electricity to the power source of the electrodialysis device (100) when the carbon dioxide concentration within the plant (400) is lower than a preset carbon dioxide concentration.

[0119] The preset carbon dioxide concentration may be appropriately set depending on the type of plant grown in the plant plant (400). As an example, the preset carbon dioxide concentration may be in the concentration range of 1000 to 2000 ppm.

[0120] The carbon dioxide fertilization system (1000) can operate the electrodialysis device (100) only when necessary. Therefore, a separate storage tank for storing the acid solution generated in the electrodialysis device (100) may not be required. This can increase the ease of management of the carbon dioxide fertilization system (1000) and simplify the design of connection lines between each device.

[0121]

[0122] FIG. 3 is a process diagram for explaining a carbon dioxide fertilization system (2000) according to other exemplary embodiments.

[0123] Referring to FIG. 3, the carbon dioxide fertilization system (2000) may include an acid solution storage tank (600) and an on-off valve (610).

[0124] The acid solution storage tank (600) may be fluidly connected to the electrodialysis device (100). The acid solution storage tank (600) may be fluidly connected to the separation device (300). The acid solution storage tank (600) may be configured to store the acid solution formed in the electrodialysis device (100).

[0125] The opening / closing valve (610) may be arranged between the acid solution storage tank (600) and the separation device (300) and configured to control the flow of the acid solution supplied to the separation device (300) by an opening / closing operation.

[0126] According to exemplary embodiments, the separation and discharge of carbon dioxide can be controlled by adjusting the opening and closing operation of the opening / closing valve (610). To this end, the control unit (501) can be configured to control the opening and closing operation of the opening / closing valve (610) according to the environmental conditions of the plant (400).

[0127] As one example, the control unit (501) can open the on-off valve (610) to supply an acid solution to the separation device (300) when the carbon dioxide concentration within the plant (400) is lower than a preset carbon dioxide concentration. As another example, the control unit (501) can close the on-off valve (610) to block the acid solution supplied to the separation device (300) when the carbon dioxide concentration within the plant (400) is higher than a preset carbon dioxide concentration.

[0128] In this way, the carbon dioxide fertilization system (2000) can utilize the stored acid solution, enabling immediate production of carbon dioxide. Furthermore, the electrodialysis device (100) can be operated only during times when electricity costs are low (e.g., late at night), thereby storing the acid solution in the acid solution storage tank (600). This reduces the overall operating costs of the carbon dioxide fertilization system (2000).

[0129] In addition, the description of the configuration substantially overlapping with the configuration of the carbon dioxide fertilization system according to FIGS. 1 and 2 can be equally applied to the carbon dioxide fertilization system according to FIG. 3, so a detailed description thereof will be omitted.

[0130]

[0131] FIG. 4 is a process diagram illustrating a carbon dioxide fertilization system (3000) according to other exemplary embodiments. The description of the carbon dioxide capture system, which substantially overlaps with the description of the carbon dioxide fertilization system of FIGS. 1 to 3, will be omitted.

[0132] Referring to FIG. 4, the electrodialysis device (100) can supply a diluted solution to a plant (400).

[0133] The diluted solution contains components belonging to the inorganic nutrients of the plant culture medium (e.g., KNO 3, K2SO 4, etc.) may be included. In addition, the pH of the diluted solution discharged from the electrodialysis device (100) may be 5 to 6.5. This pH range corresponds to a range that can be preferably used in plant culture solutions. Therefore, by supplying the diluted solution to the plant plant (400), the plant cultivation efficiency of the plant plant (400) can be improved. The diluted solution treatment process for discharging the diluted solution to the outside can be omitted, thereby simplifying the design of the carbon dioxide fertilization system (3000). In addition, the cost of treating the diluted solution can be reduced.

[0134]

[0135] FIG. 5 is a process diagram illustrating a carbon dioxide fertilization system (4000) according to other exemplary embodiments.

[0136] Referring to FIG. 5, the diluted solution can be circulated to the absorption device (200) and the separation device (300). This can reduce the amount of water lost during the operation of the carbon dioxide fertilization system (4000). Accordingly, the amount of water (e.g., make-up water) supplied to the electrodialysis device (100) can be reduced. Furthermore, by recycling the diluted solution, the cost of processing the diluted solution can be reduced. In this case, the overall operating cost of the carbon dioxide fertilization system (4000) can be reduced, and the unit cost of producing carbon dioxide supplied to the plant (400) can be saved.

[0137] In addition, the description of the configuration that substantially overlaps with the configuration of the carbon dioxide fertilization system according to FIGS. 1 to 4 can be equally applied to the carbon dioxide fertilization system according to FIG. 5, so a detailed description thereof will be omitted.

[0138]

[0139] According to further exemplary embodiments of the present invention, a carbon dioxide fertilization method is provided.

[0140] The carbon dioxide fertilization method may include a step of determining whether to separate carbon dioxide, a step of absorbing carbon dioxide, and a step of supplying carbon dioxide. This allows carbon dioxide to be separated from an absorption solution formed by the reaction of a raw gas containing carbon dioxide with a base solution and supplied to the plant.

[0141]

[0142] According to exemplary embodiments, the step of determining whether to separate carbon dioxide may be determined based on the environmental conditions of the plant. More specifically, if the environmental conditions of the plant are not suitable for plant growth (e.g., if carbon dioxide is insufficient), the decision to separate carbon dioxide from the absorption solution may be made.

[0143] Whether carbon dioxide is separated or not can be controlled by the operation of the electrodialysis device or by the supply of acid solution to the separation device.

[0144]

[0145] According to exemplary embodiments, the carbon dioxide absorption step may be performed using an electrodialysis device, an absorption device, and a separation device. More specifically, the raw material gas and the base solution may be supplied to the absorption device to form the absorption solution. In addition, the acid solution and the absorption solution may be supplied to the separation device to separate the salt solution and the carbon dioxide from the absorption solution. At this time, whether or not the carbon dioxide is separated may be determined according to the environmental conditions of the plant, as described above. Meanwhile, the base solution required for carbon dioxide absorption and the acid solution required for carbon dioxide separation may be obtained by supplying a salt solution to the electrodialysis device and electrolyzing the salt solution.

[0146] The electrodialysis device, absorption device, and separation device can circulate the solution required for carbon dioxide absorption and regeneration within the system as described above, thereby improving the efficiency of carbon dioxide absorption.

[0147]

[0148] According to exemplary embodiments, the carbon dioxide supply step may be a step of supplying separated carbon dioxide to a plant. This allows carbon dioxide to be directly captured from the raw gas and supplied to the plant. Furthermore, carbon dioxide can be supplied only when necessary, taking into account the environmental conditions of the plant, thereby improving the efficiency of the carbon dioxide fertilization method.

[0149]

[0150] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0151]

[0152] [Sasa]

[0153] The present invention was derived from research supported by the Industrial Technology Alchemist Project of the Ministry of Trade, Industry and Energy and the Korea Institute of Industrial Technology Evaluation and Planning (KEIT) in 2023.

[0154] (2023000762, Development of a small modular DAC system for CO2 supply to urban plant factories and a technology for producing blue-green hydrogen using microalgae)

[0155] This work was supported by the Alchemist Project (2023000762, Development of a compact modular DAC system for supplying CO2 to urban vertical farms and turquoise hydrogen production technology using micro algae) funded By the Ministry of Trade, Industry & Energy(MOTIE, Korea) and Korea Evaluation & Planning of Industrial Technology(KEIT)

[0156] 1000: Carbon dioxide fertilization system

[0157] 100: Electrodialysis device

[0158] 200: Absorber

[0159] 300: Separation device

[0160] 400: Plant Plant

[0161] 500: Control Unit

Claims

1. An electrodialysis device configured to separate a salt solution into an acid solution and a base solution; An absorption device configured to react the base solution and a raw material gas containing carbon dioxide and discharge an absorption solution that absorbs the carbon dioxide from the raw material gas; A separation device configured to react the above absorption solution and the above acid solution to separate and discharge carbon dioxide and a salt solution, and supply the separated and discharged carbon dioxide to a plant; and A control unit configured to control the separation and emission of carbon dioxide based on the environmental conditions of the plant, A carbon dioxide fertilization system in which the salt solution discharged from the above separation device is circulated to an electrodialysis device.

2. In paragraph 1, The above salt solution is, KCl, KNO 3 , K 2 SO 4 or a combination thereof, and water (H 2 A carbon dioxide fertilization system including O).

3. In paragraph 1, Carbon dioxide fertilization system with a supply temperature of the above salt solution of 20 to 50°C.

4. In paragraph 1, The above acid solution is, HCl, HNO 3 , H 2 SO 4 A carbon dioxide fertilization system comprising a combination thereof.

5. In paragraph 1, The above base solution is a carbon dioxide fertilization system containing KOH.

6. In paragraph 5, The above base solution is a carbon dioxide fertilization system containing 5 to 25 wt% of KOH.

7. In paragraph 1, The above electrodialysis device, Discharging a diluted solution having a lower salt concentration than the above salt solution, A carbon dioxide fertilization system that supplies the above diluted solution to the above plant.

8. In paragraph 1, The above electrodialysis device, Discharging a diluted solution having a lower salt concentration than the above salt solution, The above diluted solution is a carbon dioxide fertilization system circulated to the absorption device and the separation device.

9. In paragraph 1, The above electrodialysis device, A carbon dioxide fertilization system, which is a bipolar electrodialysis device containing a bipolar membrane.

10. In paragraph 1, The above absorption device, It includes a first inlet through which the raw material gas is supplied, and a second inlet located above the first inlet and through which the base solution is supplied. A carbon dioxide fertilization system comprising a first outlet positioned lower than the first inlet and configured to discharge the absorption solution.

11. In paragraph 10, The above absorption device, A carbon dioxide fertilization system further comprising a third inlet positioned above the first inlet and through which a defoaming agent is supplied.

12. In paragraph 1, The above control unit, A carbon dioxide fertilization system configured to determine whether to operate the electrodialysis device depending on the environmental conditions of the plant.

13. In paragraph 12, The above control unit, A carbon dioxide fertilization system configured to determine whether an electrodialysis device is operating by comparing the internal carbon dioxide concentration of the plant with a preset carbon dioxide concentration.

14. In paragraph 1, The above carbon dioxide fertilization system is, It further includes an acid solution storage tank fluidly connected to the electrodialysis device and the separation device, respectively, and an opening / closing valve arranged between the acid solution storage tank and the separation device and configured to control the flow of the acid solution supplied to the separation device by an opening / closing operation. The above control unit, A carbon dioxide fertilization system configured to control the opening and closing operation of the opening / closing valve according to the environmental conditions of the above plant.

15. A carbon dioxide fertilization method for separating carbon dioxide from an absorption solution formed by the reaction of a raw material gas containing carbon dioxide and a base solution and supplying it to a plant. A step of determining whether or not to separate the carbon dioxide based on the environmental conditions of the plant; A step of supplying the above raw material gas and the above base solution to an absorption device to form the above absorption solution; A step of supplying a salt solution and the absorption solution to a separation device to separate the salt solution and the carbon dioxide from the absorption solution; A step of supplying the salt solution to an electrodialysis device to form the base solution and the acid solution, wherein the base solution is supplied to the absorption device and the acid solution is supplied to the separation device; and Comprising a step of supplying the separated carbon dioxide to the plant, A carbon dioxide fertilization method in which the separation of the carbon dioxide is controlled by the operation of the electrodialysis device or the supply of an acid solution to the separation device.

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