A solution purification recovery system and carbon capture system

Abstract

The present application provides a solution purification recovery system and a carbon capture system, the solution purification recovery system comprising: a filtering unit for passing in amine solution, a buffer unit, a reaction unit and a purification unit, the inlet and the liquid outlet of the buffer unit being connected by a pipeline, the reaction unit comprising an electrodialysis reactor, the electrodialysis reactor having a concentrated water chamber and a dilute water chamber, the dilute water chamber being communicated with the outlet of the buffer unit, the purification unit comprising a purification assembly and a flushing assembly, the purification assembly comprising a resin tank, the resin tank being communicated with the dilute water chamber, the flushing assembly being connected with the resin tank, the resin tank having a lye outlet, the lye outlet being connected with the pipeline between the inlet and the liquid outlet of the buffer unit through a lye conveying pipeline, the flushing assembly passing in regeneration solution into the resin tank, and passing in the lye generated by the resin tank into the pipeline between the inlet and the liquid outlet of the buffer unit. The solution purification recovery system of the present application has simple processing flow, convenient cleaning and regeneration, and high solution purification degree.

Description

Technical Field

[0001] This invention relates to the field of amine liquid purification technology, specifically to a solution purification and recovery system and a carbon capture system. Background Technology

[0002] Using organic amine solutions to remove acidic gases (H2S, CO2, SO2, etc.) is a common method in the oil and gas industry. However, as absorption proceeds, the continuous accumulation of impurities, degradation products, and heat-stabilized salts in the amine solution alters the composition of the absorbent, reduces the amine content, and affects the removal efficiency. Furthermore, high levels of heat-stabilized salts accelerate amine foaming, increase scaling on equipment, reduce amine absorption and desorption efficiency, result in high residual acid gas in the lean solution, and decrease the unit's processing capacity. Scale and salt formation also clog system pipelines, causing equipment corrosion and increased energy consumption.

[0003] Related technologies typically employ one or more of the following methods for impurity removal: filtration (activated carbon filters, mechanical filters), ion exchange, and electrodialysis. For example, in a purification process involving ion exchange followed by electrodialysis: while ion exchange resins can remove ions and organic matter from water, they are not suitable for deep desalination. Furthermore, the adsorption of large amounts of impurity ions can accelerate resin saturation, necessitating regeneration and cleaning of the ion exchange resin, thus complicating the system process. In addition, once the ion exchange resin becomes saturated, it requires regenerants (such as brine, acid, or alkali) for removal. This purification process uses more chemicals and generates more wastewater, resulting in additional operating costs. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a solution purification and recovery system, which features a simple process, convenient cleaning and regeneration, and a high degree of solution purification.

[0005] The solution purification and recovery system of this invention includes:

[0006] A filtration unit having an inlet and an outlet, the inlet being used to introduce amine solution;

[0007] A buffer unit, wherein the inlet of the buffer unit is connected to the drain outlet via a pipe;

[0008] The reaction unit includes an electrodialysis reactor, an electrode liquid circulation assembly, and a waste liquid circulation assembly. The electrodialysis reactor has a concentrate chamber and a desalination chamber. The desalination chamber is connected to the outlet of the buffer unit. The electrode liquid circulation assembly is connected to the desalination chamber to circulate the amine solution introduced into the desalination chamber between the desalination chamber and the electrode liquid circulation assembly. The waste liquid circulation assembly is connected to the concentrate chamber to circulate the amine solution introduced into the concentrate chamber between the concentrate chamber and the waste liquid circulation assembly.

[0009] The purification unit includes a purification component and a rinsing component. The purification component includes a resin tank connected to the freshwater chamber for purifying the amine solution introduced into the resin tank. The rinsing component is connected to the resin tank. The resin tank has an alkali outlet connected to one end of an alkali delivery pipeline. The other end of the alkali delivery pipeline is connected to a pipeline between the inlet of the buffer unit and the drain outlet.

[0010] The rinsing assembly is used to introduce regenerative liquid into the resin tank to rinse the resin tank and generate alkaline solution. The alkaline solution generated after rinsing the resin tank is introduced into the pipeline between the inlet of the buffer unit and the drain port through the alkaline solution outlet and the alkaline conveying pipeline.

[0011] The solution purification and recovery system of this invention first adjusts the ion concentration in the solution through a reaction unit to remove the mixture of charged ions and heat-stable salts and other impurities in the solution, and then uses a purification unit for deep purification. Thus, while improving the solution purification efficiency, it can also reduce the burden of purification unit, thereby avoiding premature saturation of the resin tank in the purification unit.

[0012] In some embodiments, the solution purification and recovery system of the present invention further includes an alkali storage unit, the alkali storage unit including an alkali storage tank and a regeneration pipeline, the flushing assembly being connected to the alkali storage tank for introducing regeneration liquid into the alkali storage tank, one end of the regeneration pipeline being connected to the alkali storage tank, and the other end of the regeneration pipeline being connected to the resin tank.

[0013] The alkali storage tank is used to store alkaline solutions. Once the resin tank reaches saturation, the alkaline solution in the storage tank is introduced into the resin tank through a regeneration pipeline to flush it and restore its exchange capacity. Furthermore, the flushing assembly can directly introduce regenerant into the alkali storage tank, mixing it with the alkaline solution there. This alters the concentration of the alkaline solution in the storage tank, allowing for backflushing of resin tanks at different saturation levels and ensuring effective flushing.

[0014] In some embodiments, the alkali storage unit further includes an alkali circulation pipeline connected to the alkali storage tank, so that a portion of the alkali solution in the alkali storage tank can circulate between the alkali circulation pipeline and the alkali storage tank.

[0015] The alkali circulation pipeline can extract alkaline liquid from the alkali storage tank and discharge the extracted alkaline liquid back into the alkali storage tank, thereby realizing the circulation of alkaline liquid between the alkali storage tank and the alkali circulation pipeline, which accelerates the mixing of alkaline solution and regenerated liquid in the alkali storage tank.

[0016] In some embodiments, the purification assembly further includes a pressurizing element connected to the resin tank for introducing pressurized gas into the resin tank.

[0017] The pressurizing component can introduce gas with a certain pressure into the resin tank, so that the pressure inside the resin tank can be maintained, thereby ensuring the physical state of the resin and the filtration effect.

[0018] In some embodiments, there are multiple resin tanks, which are arranged in parallel.

[0019] In some embodiments, the flushing assembly includes a flushing outlet, which is connected to the regeneration pipeline and the alkali storage tank via pipes.

[0020] The flushing outlet of the flushing assembly is connected to the regeneration pipeline, enabling the flushing assembly to pass the regeneration liquid into the regeneration pipeline and mix it with the alkaline liquid in the regeneration pipeline before passing it into the resin tank, thereby further ensuring the concentration of the alkaline liquid entering the resin tank.

[0021] In some embodiments, the buffer unit includes a plurality of amine liquid storage tanks arranged in parallel, the inlet of the amine liquid storage tanks being connected to the drain outlet, and the outlet of the amine liquid storage tanks being connected to the freshwater chamber.

[0022] Arranging multiple amine storage tanks in parallel increases the overall storage space for amines. Furthermore, the parallel arrangement of amine storage tanks ensures that the function of a single amine storage tank is not affected by the status of other amine storage tanks. Even if one amine storage tank experiences an accident such as leakage or blockage, the other amine storage tanks can still remain safe and operate normally, thereby reducing the risk to the entire system due to a single point of failure.

[0023] In some embodiments, the reaction unit further includes an amine liquid circulation pipeline, one end of which is connected to the fresh water chamber, and the other end of which is connected to at least one of the plurality of amine liquid storage tanks, so as to allow the liquid in the fresh water chamber to be introduced into the amine liquid storage tank through the amine liquid circulation pipeline.

[0024] The desalinated amine solution in the freshwater chamber can be passed into the amine solution storage tank to prepare for the next passage into the electrodialysis reactor. This process can be repeated multiple times to ensure the removal of impurities from the amine solution.

[0025] In some embodiments, the polar liquid circulation assembly includes an polar liquid tank and a first pump, the polar liquid tank, the first pump, and the freshwater chamber are connected by a pipeline, the polar liquid tank has a first water inlet for injecting water into the polar liquid tank, and the polar liquid circulation assembly is connected to the freshwater chamber for circulating the amine solution introduced into the freshwater chamber between the freshwater chamber and the polar liquid circulation assembly.

[0026] The waste liquid circulation assembly includes a waste liquid tank and a second pump. The waste liquid tank, the second pump, and the concentrate chamber are connected by a pipeline. The waste liquid tank has a second water inlet for injecting water into the waste liquid tank. The waste liquid circulation assembly is connected to the concentrate chamber for circulating the amine solution that enters the concentrate chamber between the concentrate chamber and the waste liquid circulation assembly.

[0027] The carbon capture system of this invention includes:

[0028] An absorption tower containing an absorbent for capturing carbon dioxide from flue gas flowing within the absorption tower;

[0029] A purification system is provided, which is connected to the absorption tower to allow the absorbent to circulate between the purification system and the absorption tower. The purification system is used to reduce the salt content in the absorbent. The purification system is a solution purification and recovery system according to any one of the above embodiments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the solution purification and recovery system according to an embodiment of the present invention.

[0031] Figure label:

[0032] 1. Filter unit; 11. Activated carbon filter; 111. Liquid inlet; 12. Microporous filter; 121. Liquid outlet.

[0033] 2. Buffer unit; 21. Amine liquid storage tank;

[0034] 3. Reaction unit; 31. Electrodialysis reactor; 32. Electrode liquid circulation assembly; 321. Electrode liquid tank; 3211. First water inlet; 322. First pump; 33. Waste liquid circulation assembly; 331. Waste liquid tank; 3311. Second water inlet; 332. Second pump; 34. Amine liquid circulation pipeline.

[0035] 41. Purification assembly; 411. Resin tank; 42. Flushing assembly; 421. Flushing outlet; 43. Pressurization component; 44. Alkali conveying pipeline.

[0036] 5. Alkali storage unit; 51. Alkali storage tank; 52. Regeneration pipeline; 53. Alkali circulation pipeline. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] like Figure 1 As shown, the solution purification and recovery system of this embodiment includes: a filtration unit 1, a buffer unit 2, a reaction unit 3, and a purification unit.

[0039] The filtration unit 1 has an inlet 111 and an outlet 121, with the inlet 111 used to introduce amine solution. The inlet of the buffer unit 2 is connected to the outlet 121 via a pipe. The reaction unit 3 includes an electrodialysis reactor 31, an electrolytic liquid circulation assembly 32, and a waste liquid circulation assembly 33. The electrodialysis reactor 31 has a concentrate chamber and a desalination chamber, with the desalination chamber connected to the outlet of the buffer unit 2.

[0040] Specifically, such as Figure 1 As shown, the amine solution enters the filtration unit 1 through the inlet 111 to remove some organic matter, particulate impurities, and solid particulate impurities from the amine solution. After filtration, the amine solution is discharged through the outlet 121 into the buffer unit 2 for buffering. The buffer unit 2 is connected to the electrodialysis reactor 31 by a pipeline, and a solution pump is installed on the pipeline to draw the amine solution in the buffer unit 2 and introduce it into the desalination chamber of the electrodialysis reactor 31.

[0041] Optionally, the filter unit 1 can be a combination of one or more filters, for example, such as Figure 1 As shown, the filtration unit 1 consists of an activated carbon filter 11 and a microporous filter 12 connected in sequence. The activated carbon filter 11 can remove organic matter, odor, pigments and some heavy metal ions from the amine solution, while the microporous filter 12 can remove solid particles and suspended matter from the amine solution, so as to avoid the impurities in the amine solution from polluting the ion membrane in the electrodialysis reactor 31. This not only extends the service life of the ion membrane, but also improves the desalination efficiency and water quality.

[0042] The purification unit includes a purification component 41 and a rinsing component 42. The purification component 41 includes a resin tank 411, which is connected to a fresh water chamber for purifying the amine solution introduced into the resin tank 411. The rinsing component 42 is connected to the resin tank 411. The resin tank 411 has an alkali outlet, which is connected to one end of an alkali conveying pipe 44. The other end of the alkali conveying pipe 44 is connected to a pipe between the inlet and the outlet 121 of the buffer unit 2. The rinsing component 42 is used to introduce regenerative liquid into the resin tank 411 to rinse the resin tank 411 and generate alkali solution. The alkali solution generated after rinsing the resin tank 411 is introduced into the pipe between the inlet and the outlet 121 of the buffer unit 2 through the alkali outlet and the alkali conveying pipe 44.

[0043] Specifically, such as Figure 1 As shown, the amine solution discharged from the electrodialysis reactor 31 is fed into the resin tank 411. The amine solution can remove the remaining ions in the ion exchange resin in the resin tank 411, thereby achieving a second purification of the amine solution.

[0044] Understandably, during the purification of the amine solution using resin tank 411, the ion exchange resin in resin tank 411 gradually becomes saturated. By introducing regeneration solution into resin tank 411 using rinsing assembly 42, the resin activity can be restored through ion exchange, and impurities on the resin can also be removed.

[0045] It should be noted that the regenerated solution can be a mixture of demineralized water and an alkaline solution (such as sodium hydroxide solution), thus containing a small amount of ions, such as sodium ions or hydrogen ions. When the regenerated solution is introduced into resin tank 411, the ions in the regenerated solution exchange with the ions on the resin, thereby restoring the resin's exchange capacity. In other words, demineralized water is used to clean the resin to remove surface impurities and loose particles; the ions in the alkaline solution exchange with the ions in the resin to achieve resin regeneration.

[0046] Furthermore, the inventors discovered that bound amine ions exist in the organic amine solution, and these bound amine ions are removed when passing through the ion exchange resin. This not only causes a loss of amine solution but also accelerates the saturation rate of the ion exchange resin, which is detrimental to the purification and recovery of the amine solution. Therefore, taking MDEA organic amine solution (methyldiethanolamine) as an example, the following reaction occurs during its operation:

[0047] H + X - +MEDA→MEDAH + X -

[0048] Among them, MEDAH + X - MEDAH is a thermally stable salt. +X is a bound amine cation. - It is a thermally stable salt anion.

[0049] In this embodiment of the solution purification and recovery system, an alkaline solution (sodium hydroxide solution) is added before the organic amine solution is introduced into the electrodialysis reactor 31. This converts the bound amine cations into neutral free amine molecules. When the amine solution enters the electrodialysis module, most of the thermally stable salt anions and sodium ions in the amine solution are rapidly removed by the electrodialysis device. The remaining small amount of thermally stable salt anions and sodium ions are further purified by anion / cation exchange resin method, achieving efficient and deep removal of impurities from the organic amine solution. Furthermore, the amount of sodium hydroxide solution used for ion exchange resin regeneration is reduced, and the generated waste sodium hydroxide solution can be used to release the bound amine ions from the amine solution, realizing the recovery and recycling of waste liquid.

[0050] Therefore, the solution purification and recovery system of this embodiment first adjusts the ion concentration in the solution through the reaction unit 3 to remove the mixture of charged ions and heat-stable salts and other impurities in the solution, and then uses the purification unit for deep purification. Thus, while improving the solution purification efficiency, it can also reduce the burden of purification unit, thereby avoiding premature saturation of the resin tank 411 in the purification unit.

[0051] In some embodiments, the solution purification and recovery system of the present invention further includes an alkali storage unit 5, which includes an alkali storage tank 51 and a regeneration pipeline 52. A flushing assembly 42 is connected to the alkali storage tank 51 to introduce regeneration liquid into the alkali storage tank 51. One end of the regeneration pipeline 52 is connected to the alkali storage tank 51, and the other end of the regeneration pipeline 52 is connected to the resin tank 411.

[0052] Specifically, such as Figure 1 As shown, the alkali storage tank 51 is used to store alkaline solutions, such as sodium hydroxide solution. The flushing assembly 42 is connected to the alkali storage tank 51 via a pipe to allow the regenerated solution to be introduced into the alkali storage tank 51 and to mix the regenerated solution with the sodium hydroxide solution, thereby achieving the function of adjusting the sodium hydroxide concentration.

[0053] Understandably, the alkaline solution in the alkali storage tank 51, through mixing with the regenerated liquid, allows for adjustable concentration, enabling thorough cleaning of resins at different saturation levels. This better removes impurities and contaminants from the resin, ensuring the rinsing effect meets expectations. Furthermore, different concentrations of alkaline solution prevent excessive resin expansion, avoiding deformation or detachment due to expansion.

[0054] In other words, the alkali storage tank 51 is used to store alkaline solutions. Once the resin tank 411 reaches saturation, the alkaline solution in the alkali storage tank 51 is introduced into the resin tank 411 through the regeneration pipeline 52 to flush the resin tank 411 and restore its exchange capacity. Furthermore, the flushing assembly 42 can directly introduce regenerated liquid into the alkali storage tank 51, mixing it with the alkaline liquid inside. This alters the concentration of the alkaline solution in the alkali storage tank 51, allowing backflushing of resin tanks 411 at different saturation levels and ensuring effective flushing.

[0055] Preferably, the alkali storage unit 5 further includes an alkali circulation pipeline 53, which is connected to the alkali storage tank 51 so that a portion of the alkali solution in the alkali storage tank 51 can circulate between the alkali circulation pipeline 53 and the alkali storage tank 51.

[0056] Specifically, such as Figure 1 As shown, a pump is installed on the alkali circulation pipeline 53. One end of the alkali circulation pipeline 53 is connected to the bottom of the alkali storage tank 51, and the other end of the alkali circulation pipeline 53 is connected to the top of the alkali storage tank 51. The pump can be used to extract the alkaline solution near the bottom of the alkali storage tank 51 and introduce it from the top of the alkali storage tank 51. This ensures that the alkaline solution can be more fully mixed under the circulation of the pipeline, making the alkaline solution and the regenerated liquid more uniformly mixed.

[0057] In other words, the alkali circulation pipeline 53 can extract alkaline liquid from the alkali storage tank 51 and discharge the extracted alkaline liquid back into the alkali storage tank 51, so as to realize the circulation of alkaline liquid between the alkali storage tank 51 and the alkali circulation pipeline 53, thereby accelerating the full mixing of alkaline solution and regenerated liquid in the alkali storage tank 51.

[0058] In some embodiments, the purification assembly 41 further includes a pressurizing member 43, which is connected to the resin tank 411 for introducing pressurized gas into the resin tank 411. The pressurizing member 43 can introduce gas with a certain pressure into the resin tank 411, so that a certain pressure can be maintained inside the resin tank 411, thereby ensuring the physical state and filtration effect of the resin.

[0059] It should be noted that the pressurized gas introduced into the resin tank 411 by the pressurizing component 43 can be an inert gas such as nitrogen, and the gas pressure range is 0.1MPa to 0.5MPa. In other words, when selecting the pressurized gas, an appropriate gas and pressure can be selected based on factors such as the type of resin, the specific requirements of the system, and safety.

[0060] Preferably, there are multiple resin tanks 411, and the multiple resin tanks 411 are arranged in parallel. It is understood that, as... Figure 1As shown, multiple resin tanks 411 connected in parallel are configured to ensure the reliability and efficient operation of the amine treatment system. This means that the multiple parallel resin tanks 411 can process amine simultaneously. When one resin tank 411 fails or requires maintenance, the other parallel resin tanks 411 can continue operating, ensuring continuous operation of the water treatment system and reducing downtime. Furthermore, the parallel resin tanks 411 can distribute the amine treatment load, preventing overload of any single resin tank 411 and helping to extend the service life of the resin.

[0061] In some embodiments, the flushing assembly 42 includes a flushing outlet 421, which is connected to the regeneration pipeline 52 and the alkali storage tank 51 via pipes.

[0062] Specifically, such as Figure 1 As shown, the pipeline to the flushing outlet 421 is divided into two branches. One branch is connected to the alkali storage tank 51 so that the regenerated liquid can be directly introduced into the alkali storage tank 51. The other branch is connected to the regeneration pipeline 52 so that the regenerated liquid discharged from the flushing outlet 421 can be introduced into the regeneration pipeline 52 and mixed with the liquid in the regeneration pipeline 52 before being introduced into the resin tank 411. A control valve is installed on this branch so that when the solution concentration adjusted by the alkali storage tank 51 does not meet the requirements, the control valve can be opened to introduce the regenerated liquid into the regeneration pipeline 52 to be directly mixed with the solution, thereby accelerating the adjustment of the alkaline solution concentration.

[0063] In other words, the flushing outlet 421 of the flushing assembly 42 is connected to the regeneration pipeline 52, so that the flushing assembly 42 can pass the regeneration liquid into the regeneration pipeline 52 and mix it with the alkaline liquid in the regeneration pipeline 52 before passing it into the resin tank 411, thereby further ensuring the concentration of the alkaline liquid passing into the resin tank 411.

[0064] Preferably, the buffer unit 2 includes multiple amine liquid storage tanks 21, which are arranged in parallel. The inlet of the amine liquid storage tank 21 is connected to the outlet 121, and the outlet of the amine liquid storage tank 21 is connected to the fresh water chamber.

[0065] It is understandable that arranging multiple amine storage tanks 21 in parallel can increase the overall storage space of amine liquid. Furthermore, the parallel arrangement of amine storage tanks 21 ensures that the function of a single amine storage tank 21 is not affected by the status of other amine storage tanks 21. Even if one amine storage tank experiences an accident such as leakage or blockage, the other amine storage tanks can still remain safe and operate normally, thereby reducing the risk of the entire system being shut down due to a single point of failure.

[0066] In some embodiments, the reaction unit 3 further includes an amine liquid circulation pipeline 34, one end of which is connected to a fresh water chamber and the other end of which is connected to at least one of a plurality of amine liquid storage tanks 21, so that the liquid in the fresh water chamber can be introduced into the amine liquid storage tank 21 through the amine liquid circulation pipeline 34.

[0067] Specifically, such as Figure 1 As shown, a pump is installed on the amine solution circulation pipeline 34. Starting the pump draws the liquid from the desalination chamber and feeds it into an amine solution storage tank 21 for storage. It is understood that the desalinated amine solution from the desalination chamber can be fed into the amine solution storage tank 21 to prepare for the next feeding into the electrodialysis reactor 31. This repeated process allows for multiple treatments of the amine solution, ensuring the effective removal of impurities from the amine solution.

[0068] In other words, the solution purification and recovery system of this embodiment of the invention is equipped with multiple amine solution storage tanks 21, and stores amine solutions with different treatment levels separately to prepare for subsequent multiple purification processes. For example: Figure 1 As shown, two amine liquid storage tanks 21 are installed downstream of the filtration unit 1. A valve is opened between one of the amine liquid storage tanks 21 and the filtration unit 1, allowing the filtered amine liquid from the filtration unit 1 to flow into this amine liquid storage tank 21. The electrodialysis reactor 31 can then extract the amine liquid from this storage tank 21 for purification. When the pump on the amine liquid circulation pipeline 34 is started, the purified amine liquid from the electrodialysis reactor 31 is extracted and fed into the other amine liquid storage tank 21. At this time, the two tanks store amine liquid with different treatment levels. Thus, if the amine liquid after the reaction is extracted for electrodialysis, multiple purification functions of the amine liquid are achieved. Correspondingly, the other amine liquid storage tank 21 can continuously store the amine liquid discharged from the filtration unit 1, meaning that the multiple ammonia liquid storage tanks can operate independently.

[0069] In some embodiments, the polar liquid circulation assembly 32 includes a polar liquid tank 321 and a first pump 322. The polar liquid tank 321, the first pump 322, and the desalination chamber are connected by a pipeline. The polar liquid tank 321 has a first water inlet 3211 for injecting water into the polar liquid tank 321. The polar liquid circulation assembly 32 is connected to the desalination chamber for circulating the amine solution introduced into the desalination chamber between the desalination chamber and the polar liquid circulation assembly 32. The waste liquid circulation assembly 33 includes a waste liquid tank 331 and a second pump 332. The waste liquid tank 331, the second pump 332, and the concentrate chamber are connected by a pipeline. The waste liquid tank 331 has a second water inlet 3311 for injecting water into the waste liquid tank 331. The waste liquid circulation assembly 33 is connected to the concentrate chamber for circulating the amine solution introduced into the concentrate chamber between the concentrate chamber and the waste liquid circulation assembly 33.

[0070] It is understandable that water is introduced into the electrodialysis tank 321 and the waste tank 331 to provide the necessary solution for the migration of amine ions, while also carrying away ions that have migrated from the concentrate chamber to the desalination chamber, thus ensuring the water quality in the desalination chamber. The concentrate chamber, on the other hand, is for ion recovery, re-concentrating the ions that have migrated there to provide the solution for the next electrodialysis process.

[0071] In other words, the polar liquid circulation component 32 and the waste liquid circulation component 33 can respectively use the first pump 322 and the second pump 332 to circulate the liquid in the desalination chamber and the concentrate chamber, thereby maintaining the performance and efficiency of the system.

[0072] The carbon capture system of this invention is described below according to an embodiment of the present invention.

[0073] The carbon capture system of this invention includes an absorption tower and a purification system.

[0074] The absorption tower contains an absorbent used to capture carbon dioxide from the flue gas flowing within it. A purification system is connected to the absorption tower to circulate the absorbent between the purification system and the absorption tower. The purification system is used to reduce the salt content in the absorbent and is a solution purification and recovery system according to any of the above embodiments.

[0075] Understandably, the absorbent in the absorption tower can be extracted through the absorbent circulation pipeline and integrated into the purification system for purification. The purified absorbent can then be reintroduced into the absorption tower for reuse, ensuring its absorption efficiency. The absorption tower can be used in coal-fired flue gas treatment systems, and the absorbent can be amine liquid, which comes into contact with the flue gas inside the tower. This allows the carbon dioxide in the flue gas to react chemically with the amine liquid, producing carbamates or carbonates.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0078] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0079] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0080] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A solution purification and recovery system, characterized by, include: A filtration unit having an inlet and an outlet, the inlet being used to introduce amine solution; A buffer unit, wherein the inlet of the buffer unit is connected to the drain outlet via a pipe; The reaction unit includes an electrodialysis reactor, an electrode liquid circulation assembly, and a waste liquid circulation assembly. The electrodialysis reactor has a concentrate chamber and a desalination chamber. The desalination chamber is connected to the outlet of the buffer unit. The electrode liquid circulation assembly is connected to the desalination chamber to circulate the amine solution introduced into the desalination chamber between the desalination chamber and the electrode liquid circulation assembly. The waste liquid circulation assembly is connected to the concentrate chamber to circulate the amine solution introduced into the concentrate chamber between the concentrate chamber and the waste liquid circulation assembly. The purification unit includes a purification component and a rinsing component. The purification component includes a resin tank connected to the freshwater chamber for purifying the amine solution introduced into the resin tank. The rinsing component is connected to the resin tank. The resin tank has an alkali outlet connected to one end of an alkali delivery pipeline. The other end of the alkali delivery pipeline is connected to a pipeline between the inlet of the buffer unit and the drain outlet. The flushing assembly is used to introduce regenerative liquid into the resin tank to flush the resin tank. The alkaline solution generated after the resin tank is flushed is introduced into the pipeline between the inlet of the buffer unit and the outlet through the alkaline solution outlet and the alkaline conveying pipeline. The amine solution discharged from the electrodialysis reactor is passed into a resin tank. The ion exchange resin in the resin tank removes the remaining ions from the amine solution, thus achieving a second purification of the amine solution. Before the organic amine solution is passed into the electrodialysis reactor, an alkaline solution is added to convert the bound amine cations into neutral free amine molecules. When the amine solution enters the electrodialysis reactor module, most of the thermally stable salt anions and sodium ions in the amine solution are rapidly removed through the electrodialysis reactor. The remaining small amount of thermally stable salt anions and sodium ions are further purified by the anion / cation exchange resin method.

2. The solution purification recovery system of claim 1, wherein, It also includes an alkali storage unit, which includes an alkali storage tank and a regeneration pipeline. The flushing assembly is connected to the alkali storage tank to introduce regeneration liquid into the alkali storage tank. One end of the regeneration pipeline is connected to the alkali storage tank, and the other end of the regeneration pipeline is connected to the resin tank.

3. The solution purification and recovery system according to claim 2, characterized in that, The alkali storage unit also includes an alkali circulation pipeline connected to the alkali storage tank, so that a portion of the alkali solution in the alkali storage tank can circulate between the alkali circulation pipeline and the alkali storage tank.

4. The solution purification and recovery system according to claim 3, characterized in that, The purification assembly also includes a pressurizing component connected to the resin tank for introducing pressurized gas into the resin tank.

5. The solution purification and recovery system according to claim 4, characterized in that, There are multiple resin tanks, which are arranged in parallel.

6. The solution purification and recovery system according to claim 5, characterized in that, The flushing assembly includes a flushing outlet, which is connected to the regeneration pipeline and the alkali storage tank via pipes.

7. The solution purification and recovery system according to claim 1, characterized in that, The buffer unit includes multiple amine liquid storage tanks, which are arranged in parallel. The inlet of each amine liquid storage tank is connected to the outlet, and the outlet of each amine liquid storage tank is connected to the freshwater chamber.

8. The solution purification and recovery system according to claim 7, characterized in that, The reaction unit further includes an amine liquid circulation pipeline, one end of which is connected to the fresh water chamber, and the other end of which is connected to at least one of the plurality of amine liquid storage tanks, so that the liquid in the fresh water chamber can be introduced into the amine liquid storage tank through the amine liquid circulation pipeline.

9. The solution purification and recovery system according to claim 8, characterized in that, The polar liquid circulation assembly includes an polar liquid tank and a first pump. The polar liquid tank, the first pump, and the fresh water chamber are connected by a pipeline. The polar liquid tank has a first water inlet for injecting water into the polar liquid tank. The polar liquid circulation assembly is connected to the fresh water chamber for circulating the amine solution introduced into the fresh water chamber between the fresh water chamber and the polar liquid circulation assembly. The waste liquid circulation assembly includes a waste liquid tank and a second pump. The waste liquid tank, the second pump, and the concentrate chamber are connected by a pipeline. The waste liquid tank has a second water inlet for injecting water into the waste liquid tank. The waste liquid circulation assembly is connected to the concentrate chamber for circulating the amine solution that enters the concentrate chamber between the concentrate chamber and the waste liquid circulation assembly.

10. A carbon capture system, characterized in that, include: An absorption tower containing an absorbent for capturing carbon dioxide from flue gas flowing within the absorption tower; A purification system connected to the absorption tower to allow the absorbent to circulate between the purification system and the absorption tower, the purification system being used to reduce the salt content in the absorbent, the purification system being a solution purification and recovery system according to any one of claims 1-9.

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