Carbon capture system for purifying and circulating organic amine solution

Abstract

The invention discloses a carbon capture system for purification and circulation of an organic amine solution, the carbon capture system comprises an absorption tower, a regeneration tower and a purification assembly, the absorption tower is used for capturing carbon dioxide in flue gas by using the organic amine solution, and the regeneration tower is connected with the absorption tower through a pipeline; the regeneration assembly comprises a multi-stage filter and an electrodialyzer, the regeneration tower is connected with the absorption tower through a pipeline and sequentially passes through the multi-stage filter and the electrodialyzer, and the regeneration tower is connected with the absorption tower through a pipeline and sequentially passes through the multi-stage filter and the electrodialyzer. And part of barren liquor flows back to the absorption tower after being filtered and desalted by the multi-stage filter and the electrodialyzer. According to the invention, heat-stable salts, high-molecular-weight degradation products and other impurity pollutants in the system are removed through the multi-stage filter and the electrodialyzer, meanwhile, the problem that alkaline wastewater is generated by amine liquid purification through an ion exchange method is avoided, cyclic utilization of resources is realized, and the efficiency and economical efficiency of the system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of carbon capture, and in particular to a carbon capture system for purification circulation of an organic amine solution. Background Art

[0002] As energy consumption demand continues to grow, fossil energy still dominates primary energy consumption, and the continued growth of thermal power installed capacity has led to high levels of carbon dioxide emissions. In order to achieve carbon peak and carbon neutrality and reduce greenhouse gas emissions, carbon dioxide capture, utilization and storage (CCUS) technology has become a key technical option.

[0003] Among the related technologies, the carbon dioxide capture technology based on organic amine solution is an effective means widely used in CCUS demonstration projects. However, during the regeneration process of the organic amine solution, due to problems such as oxidation and thermal degradation, external introduction and pipeline corrosion, heat-stable salts, high molecular weight degradation products and other pollutants will be generated, posing a major threat to the carbon capture system, causing equipment corrosion, system foaming, flooding, low utilization of effective amine solution, unstable operation, and leading to unplanned failures and shutdowns. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a carbon capture system with an organic amine solution purification cycle, which has the advantages of continuous, efficient and stable operation.

[0006] The carbon capture system of the organic amine solution purification cycle of the embodiment of the present invention comprises:

[0007] An absorption tower, wherein the absorption tower is used to capture carbon dioxide in the flue gas using an organic amine solution;

[0008] A regeneration tower, the regeneration tower is connected to the absorption tower via a pipeline, so that the rich liquid capturing carbon dioxide in the absorption tower flows into the regeneration tower for heating and regeneration, and the lean liquid after regeneration in the regeneration tower flows back to the absorption tower for recycling;

[0009] A purification component, wherein the purification component includes a multi-stage filter and an electrodialyzer, and the regeneration tower is also connected to the absorption tower through a pipeline and sequentially through the multi-stage filter and the electrodialyzer, so that part of the lean liquid is filtered and desalted by the multi-stage filter and the electrodialyzer and then flows back to the absorption tower;

[0010] A control component, the control component includes a PLC module and a monitoring unit, the monitoring unit is arranged on the pipeline between the absorption tower and the regeneration tower to monitor the content of heat-stable salt in the organic amine solution, the monitoring unit is connected to the PLC module to transmit monitoring data to the PLC module, and the PLC module is used to adjust the operating parameters of the organic amine solution filtration and desalination operation according to the monitoring data.

[0011] The carbon capture system with organic amine solution purification cycle in the embodiment of the present invention removes heat-stable salts, high molecular weight degradation products and other impurities and pollutants in the system through multi-stage filters and electrodialyzers, while avoiding the problem of alkaline wastewater generated by ion exchange amine solution purification, realizing resource recycling and improving the efficiency and economy of the system. In addition, the control component is used for real-time monitoring and automatic regulation, so that the system can respond to changes in the content of heat-stable salts in the solution in a timely manner, thereby avoiding system instability caused by accumulation of heat-stable salts.

[0012] In some embodiments, the multi-stage filter includes a pre-filter, a molecular sieve filter and a post-filter, and the pre-filter, the molecular sieve filter and the post-filter are sequentially connected from upstream to downstream in the solution flow direction.

[0013] In some embodiments, the filtering accuracy of the pre-filter is 10 μm, the filtering accuracy of the post-filter is 5 μm, and the filtering accuracy of the molecular sieve filter is 0.51-0.56 nm.

[0014] In some embodiments, a heat exchanger is provided on the pipeline between the absorption tower and the regeneration tower so that the rich liquid flowing out of the absorption tower and the lean liquid flowing out of the regeneration tower can exchange heat with each other.

[0015] In some embodiments, a lean liquid pump is provided on the pipeline on the lean liquid outlet side of the heat exchanger, and a rich liquid pump is provided on the pipeline on the rich liquid outlet side of the heat exchanger.

[0016] In some embodiments, a cooler is provided on the downstream pipeline of the lean liquid pump in the solution flow direction, so that the lean liquid after heat exchange through the heat exchanger flows through the cooler and is cooled to a preset temperature.

[0017] In some embodiments, the cooler is directly connected to the absorption tower via a pipeline, and the cooler is also connected to the absorption tower via a pipeline and through the multi-stage filter and the electrodialyzer.

[0018] In some embodiments, a circulating water replenishment pipeline and an organic amine solution replenishment pipeline are also provided on the pipeline on the lean liquid inlet side of the absorption tower.

[0019] In some embodiments, a reboiler is provided at the bottom of the regeneration tower, and the reboiler is used to heat and regenerate the rich liquid in the regeneration tower.

[0020] In some embodiments, a water washing tower is further included, and the water washing tower is connected to the absorption tower via a pipeline, so that the flue gas is washed by the water washing tower and then flows into the absorption tower to capture carbon dioxide in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a carbon capture system for purification cycle of an organic amine solution according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] 1-absorption tower, 2-regeneration tower, 3-pre-filter, 4-molecular sieve filter, 5-post-filter, 6-electrodialyzer, 7-heat exchanger, 8-lean liquid pump, 9-rich liquid pump, 10-cooler, 11-circulating water replenishment pipeline, 12-organic amine solution replenishment pipeline, 13-reboiler, 14-water washing tower. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] The carbon capture system for purification circulation of organic amine solution according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the carbon capture system for purification circulation of organic amine solution according to the embodiment of the present invention comprises: an absorption tower 1, a regeneration tower 2, a purification component and a control component (not shown in the figure).

[0027] The absorption tower 1 is one of the core components of the system, and its main function is to capture carbon dioxide in the flue gas using an organic amine solution. The flue gas passes through the absorption tower 1, and the carbon dioxide in the flue gas is absorbed by the organic amine solution to form a rich liquid rich in carbon dioxide.

[0028] The regeneration tower 2 is connected to the absorption tower 1 through a pipeline, and is used to heat and regenerate the rich liquid that captures carbon dioxide in the absorption tower 1. In the regeneration tower 2, the carbon dioxide in the rich liquid is further processed (sealed and reused) as regeneration gas, and the regenerated lean liquid is returned to the absorption tower 1 through a pipeline for recycling.

[0029] The purification component includes a multi-stage filter and an electrodialyzer 6. The regeneration tower 2 is also connected to the absorption tower 1 through a pipeline and sequentially through the multi-stage filter and the electrodialyzer 6. The main function of the purification component is to remove thermally stable salts, high molecular weight degradation products and other impurities and pollutants in the system, thereby ensuring the stable operation of the system.

[0030] The multi-stage filter is used to filter out solid particles and suspended matter in the lean liquid to prevent these impurities from entering the electrodialyzer 6, thereby protecting the electrodialyzer 6 from contamination.

[0031] The electrodialyzer 6 utilizes electric field to remove ions in the lean solution, such as heat-stable salts, etc., to reduce the problem of ion pollution in the system. Compared with the ion exchange method, the electrodialyzer 6 does not produce alkaline wastewater and alkaline residue, thereby avoiding additional environmental problems.

[0032] Thus, in the carbon capture system with organic amine solution purification cycle of the embodiment of the present invention, the lean liquid in the system can be recycled through the filtering and desalination of the purification component, thereby improving the utilization efficiency of resources. The purified lean liquid can more effectively participate in the capture of carbon dioxide, thereby improving the overall capture efficiency of the system. The optimized design of the system reduces maintenance costs and operating costs, while avoiding the treatment costs of alkaline wastewater.

[0033] Further, the control component includes a PLC (Programmable Logic Controller) module and a monitoring unit.

[0034] The monitoring unit is installed on the pipeline between the absorption tower 1 and the regeneration tower 2 to monitor the content of heat-stable salts in the organic amine solution in real time. The accumulation of heat-stable salts will affect the efficiency and stability of the system, and may cause equipment corrosion, system foaming and other problems. Through the monitoring unit, the concentration of heat-stable salts in the system can be understood in real time to ensure that measures are taken before reaching the critical value.

[0035] The monitoring unit is connected to the PLC module and can transmit the real-time monitored data to the PLC module. The PLC module has data processing capabilities and can quickly process and analyze the monitoring data to provide a basis for the automatic control of the system.

[0036] The PLC module automatically controls the operating parameters of the organic amine solution filtration and desalination operation according to the data transmitted by the monitoring unit. These parameters include filtration speed, voltage and current of the electrodialyzer 6, flow rate of the solution, etc. Automatic control can ensure that the system operates in the optimal state, improve the capture efficiency, and reduce damage to the equipment.

[0037] Therefore, the carbon capture system of the organic amine solution purification cycle of the embodiment of the present invention can respond to the changes in the content of heat-stable salts in the solution in a timely manner through real-time monitoring and automatic regulation, thereby avoiding system instability caused by the accumulation of heat-stable salts, such as corrosion, foaming, etc.

[0038] The PLC module can adjust system operating parameters based on real-time data, optimize operating procedures, ensure that the system can operate under optimal conditions, and improve carbon dioxide capture efficiency. Since the system can adjust automatically, it reduces dependence on manual intervention, thereby reducing maintenance costs and downtime.

[0039] The automatic monitoring and control function of the system improves the safety of the system and avoids potential dangers caused by operational errors or untimely monitoring. The automatic control system can adjust operating parameters as needed, reduce energy consumption, improve resource utilization efficiency, and thus enhance overall economic benefits.

[0040] In some embodiments, Figure 1 As shown, the multi-stage filter includes a pre-filter 3, a molecular sieve filter 4 and a post-filter 5, and the pre-filter 3, the molecular sieve filter 4 and the post-filter 5 are sequentially connected from upstream to downstream in the solution flow direction.

[0041] The pre-filter 3 is used to remove larger particles, suspended matter and insoluble matter in the solution. It prevents large particles from entering the molecular sieve filter 4 and the post-filter 5, thereby protecting these components from physical damage and extending their service life. It reduces the suspended matter in the solution and its impact on the system operation efficiency, provides preliminary purification for the solution, and lays the foundation for subsequent fine processing.

[0042] The molecular sieve filter 4 is a material with a microporous structure that can be screened according to the size and shape of molecules. The molecular sieve filter 4 can effectively remove tiny insoluble particles in the solution, which may not be removed by the pre-filter 3. The molecular sieve filter 4 also has adsorption properties and can adsorb some organic substances and pigments in the solution to further purify the solution. Through the fine filtration of the molecular sieve filter 4, the purity of the solution is improved, which is conducive to improving the desalination efficiency of the subsequent electrodialyzer 6.

[0043] The post-filter 5 is used for the final stage of filtration. After the solution passes through the molecular sieve filter 4, the post-filter 5 further ensures that all impurities that have not been removed are removed to prevent these impurities from entering the electrodialyzer 6. The post-filter 5 can protect the electrodialyzer 6 from being contaminated by tiny particles and organic matter, and extend the service life of the electrodialyzer 6. Through the final filtration, the stability of the entire system is ensured to avoid problems caused by impurities.

[0044] Optionally, the multi-stage filter uses a honeycomb wire-wound filter element filter, the filtering accuracy of the pre-filter 3 is 10μm, the filtering accuracy of the post-filter 5 is 5μm, the molecular sieve filter 4 uses 5A hydrophilic pure phase dense ZSM-5 zeolite, and the filtering accuracy of the molecular sieve filter 4 is 0.51~0.56nm.

[0045] In some embodiments, Figure 1 As shown, a heat exchanger 7 is provided on the pipeline between the absorption tower 1 and the regeneration tower 2 so that the rich liquid flowing out of the absorption tower 1 and the lean liquid flowing out of the regeneration tower 2 can exchange heat with each other.

[0046] It can be understood that the heat exchanger 7 realizes heat exchange between the rich liquid and the lean liquid. The temperature of the rich liquid flowing out of the absorption tower 1 is higher because it has just completed the absorption process of carbon dioxide, while the temperature of the lean liquid flowing out of the regeneration tower 2 is lower because it has just completed the release and regeneration process of carbon dioxide. Through the heat exchanger 7, the heat in the rich liquid can be transferred to the lean liquid, so that the lean liquid is preheated before entering the regeneration tower 2, thereby reducing the heating energy required in the regeneration process, realizing energy recovery and utilization, and reducing the energy consumption of the entire system.

[0047] Preheating the lean liquid helps improve the efficiency of the regeneration tower 2. Because the temperature of the lean liquid has increased when it enters the regeneration tower 2, the heat input required in the regeneration process can be reduced, thereby improving the regeneration efficiency and accelerating the release rate of carbon dioxide. Since the lean liquid has been preheated before entering the regeneration tower 2, the corrosion phenomenon caused by excessive temperature gradient in the regeneration tower 2 can be reduced. In addition, the heat exchanger 7 can also reduce the dissolved oxygen in the lean liquid, further reducing the corrosion rate.

[0048] In some embodiments, Figure 1 As shown, a lean liquid pump 8 is provided on the pipeline on the lean liquid outlet side of the heat exchanger 7 , and a rich liquid pump 9 is provided on the pipeline on the rich liquid outlet side of the heat exchanger 7 .

[0049] The lean liquid pump 8 and the rich liquid pump 9 provide the necessary fluid power for the system to ensure that the lean liquid and the rich liquid can circulate in the system. The function of the pump is to overcome the resistance in the system, including pipeline friction, valve loss, heat exchanger 7 resistance, etc., so as to maintain a stable flow and pressure.

[0050] The flow rates of the lean liquid and the rich liquid can be adjusted by the lean liquid pump 8 and the rich liquid pump 9 to suit different operating conditions and requirements. The operating speed of the pump can be adjusted to change the flow rate and pressure of the fluid to meet the design requirements of the system.

[0051] Thus, the setting of the pump helps to ensure that the lean liquid and the rich liquid stay in the heat exchanger 7 for a sufficient time to achieve sufficient heat exchange. This can improve thermal efficiency and reduce system energy consumption. In addition, the setting of the pump also increases the flexibility and adjustability of the system. During the operation of the system, the flow of the lean liquid and the rich liquid needs to be adjusted according to actual conditions to optimize the system performance. The presence of the pump makes this adjustment possible.

[0052] In addition, pumps can help maintain the stable operation of the system. When the system is started, stopped or running, the pump can respond quickly and adjust the fluid flow state to prevent the system from becoming unstable due to flow fluctuations.

[0053] For example, when the system is started, the lean liquid pump 8 and the rich liquid pump 9 can help quickly establish fluid circulation, shorten the system warm-up time, and improve the system startup performance. When the system load changes, the pump can adjust the flow and pressure to adapt to the new load conditions to ensure efficient operation of the system.

[0054] In some embodiments, Figure 1 As shown, a cooler 10 is provided on the downstream pipeline of the lean liquid pump 8 in the solution flow direction, so that the lean liquid after heat exchange in the heat exchanger 7 flows through the cooler 10 and is cooled to a preset temperature.

[0055] It should be noted that after the lean liquid passes through the heat exchanger 7, although heat exchange has been performed, its temperature is still relatively high. The temperature of the lean liquid has an important influence on the capture efficiency of carbon dioxide, and a suitable temperature is conducive to improving the absorption efficiency of the organic amine solution for carbon dioxide.

[0056] The design and operating conditions of the absorption tower 1 are usually based on a specific temperature range. The cooler 10 can ensure that the temperature of the lean liquid meets the optimal operating conditions of the absorption tower 1, so that the absorption tower 1 can operate in the best state and ensure a stable capture effect.

[0057] In some embodiments, Figure 1 As shown, the cooler 10 is directly connected to the absorption tower 1 via a pipeline, and the cooler 10 is also connected to the absorption tower 1 via a pipeline and through a multi-stage filter and an electrodialyzer 6.

[0058] In other words, there are two pipelines between the cooler 10 and the absorption tower 1, one of which is used to directly transport the lean liquid flowing out of the cooler 10 back to the absorption tower 1, and the other is used to filter, desalinate and purify the lean liquid flowing out of the cooler 10 before transporting it back to the absorption tower 1.

[0059] It is understandable that the design of two parallel pipelines allows the system to flexibly select the treatment process of the lean liquid according to the changes in the heat-stable salt content monitored in real time. When the heat-stable salt content is low, the lean liquid can be directly transported back to the absorption tower 1; when the heat-stable salt content is high, the lean liquid needs to be filtered, desalted and purified before being transported back to the absorption tower 1.

[0060] Therefore, by monitoring the content of heat-stable salt in the solution, the flow rates of the two pipelines can be accurately controlled, so as to ensure that the lean solution reaches the best treatment state before entering the absorption tower 1, thereby ensuring the capture efficiency, avoiding unnecessary purification treatment, and saving energy and cost.

[0061] In some embodiments, Figure 1 As shown, the pipeline on the lean liquid inlet side of the absorption tower 1 is also provided with a circulating water replenishment pipeline 11 and an organic amine solution replenishment pipeline 12, and these pipelines are designed to ensure the stability of the concentration of the organic amine solution in the system.

[0062] The circulating water replenishment pipeline 11 is used to replenish the circulating water loss caused by evaporation or leakage in the system and maintain a stable liquid level. The replenished circulating water can adjust the temperature as needed to ensure the carbon dioxide capture efficiency.

[0063] The organic amine solution replenishment pipeline 12 is used to replenish the organic amine solution to maintain the concentration of the organic amine in the absorption tower 1. This is the key to ensuring the carbon dioxide capture effect. By replenishing fresh organic amine solution, the composition of the amine in the solution can be adjusted to optimize the capture performance. Since the organic amine solution may be lost during the capture process, the replenishment pipeline can replenish the lost part in time to maintain the stable operation of the system.

[0064] Therefore, the design of two pipelines helps to maintain the stable circulation of organic amine solution and ensure the stable operation of the system. By adjusting the flow of water replenishment and liquid replenishment pipelines, operators can flexibly adjust the working state of the system to adapt to different working conditions and needs. By accurately controlling the amount of water replenishment and liquid replenishment, unnecessary waste can be reduced, resource utilization efficiency can be improved, and operating costs can be reduced.

[0065] In some embodiments, Figure 1 As shown, a reboiler 13 is provided at the bottom of the regeneration tower 2. The reboiler 13 is used to heat the rich liquid in the regeneration tower 2 to promote the release of carbon dioxide from the rich liquid and convert it into lean liquid for recycling in the system.

[0066] It is understandable that the main function of the reboiler 13 is to heat the rich liquid in the regeneration tower 2. The rich liquid contains carbon dioxide captured from the absorption tower 1, and heating can reduce the solubility of carbon dioxide in the solution, thereby promoting the release of carbon dioxide from the rich liquid.

[0067] like Figure 1 As shown, the carbon capture system for purification circulation of organic amine solution according to the embodiment of the present invention further includes a water washing tower 14, which is connected to the absorption tower 1 via a pipeline.

[0068] It is understandable that the water washing tower 14 pre-treats the flue gas entering the absorption tower 1, and removes dust, acidic gases (such as sulfur dioxide, etc.) and other impurities in the flue gas by water washing. This helps to reduce the contamination of these impurities to the organic amine solution in the absorption tower 1 and improve the capture efficiency of carbon dioxide.

[0069] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0073] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0074] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A carbon capture system for purification circulation of organic amine solution, characterized in that: include: An absorption tower, wherein the absorption tower is used to capture carbon dioxide in the flue gas using an organic amine solution; A regeneration tower, the regeneration tower is connected to the absorption tower via a pipeline, so that the rich liquid capturing carbon dioxide in the absorption tower flows into the regeneration tower for heating and regeneration, and the lean liquid after regeneration in the regeneration tower flows back to the absorption tower for recycling; A purification component, wherein the purification component includes a multi-stage filter and an electrodialyzer, and the regeneration tower is also connected to the absorption tower through a pipeline and sequentially through the multi-stage filter and the electrodialyzer, so that part of the lean liquid is filtered and desalted by the multi-stage filter and the electrodialyzer and then flows back to the absorption tower; A control component, the control component includes a PLC module and a monitoring unit, the monitoring unit is arranged on the pipeline between the absorption tower and the regeneration tower to monitor the content of heat-stable salt in the organic amine solution, the monitoring unit is connected to the PLC module to transmit monitoring data to the PLC module, and the PLC module is used to adjust the operating parameters of the organic amine solution filtration and desalination operation according to the monitoring data.

2. The carbon capture system for organic amine solution purification circulation according to claim 1, characterized in that: The multi-stage filter comprises a pre-filter, a molecular sieve filter and a post-filter, wherein the pre-filter, the molecular sieve filter and the post-filter are sequentially connected from upstream to downstream in the flow direction of the solution.

3. The carbon capture system for organic amine solution purification circulation according to claim 2, characterized in that: The filtering accuracy of the pre-filter is 10 μm, the filtering accuracy of the post-filter is 5 μm, and the filtering accuracy of the molecular sieve filter is 0.51-0.56 nm.

4. The carbon capture system for organic amine solution purification circulation according to claim 2, characterized in that: A heat exchanger is provided on the pipeline between the absorption tower and the regeneration tower so that the rich liquid flowing out of the absorption tower and the lean liquid flowing out of the regeneration tower can exchange heat with each other.

5. The carbon capture system for organic amine solution purification circulation according to claim 4, characterized in that: A lean liquid pump is provided on the pipeline on the lean liquid outlet side of the heat exchanger, and a rich liquid pump is provided on the pipeline on the rich liquid outlet side of the heat exchanger.

6. The carbon capture system for organic amine solution purification circulation according to claim 5, characterized in that: A cooler is provided on the downstream pipeline of the lean liquid pump in the solution flow direction, so that the lean liquid after heat exchange through the heat exchanger flows through the cooler and is cooled to a preset temperature.

7. The carbon capture system for organic amine solution purification circulation according to claim 6, characterized in that: The cooler is directly connected to the absorption tower via a pipeline, and the cooler is also connected to the absorption tower via a pipeline and through the multi-stage filter and the electrodialyzer.

8. The carbon capture system for organic amine solution purification circulation according to claim 7, characterized in that: A circulating water replenishment pipeline and an organic amine solution replenishment pipeline are also provided on the pipeline on the lean liquid inlet side of the absorption tower.

9. The carbon capture system for organic amine solution purification circulation according to claim 8, characterized in that: A reboiler is provided at the bottom of the regeneration tower, and the reboiler is used for heating and regenerating the rich liquid in the regeneration tower.

10. The carbon capture system for purification circulation of organic amine solution according to any one of claims 1 to 9, characterized in that: It also includes a water washing tower, which is connected to the absorption tower through a pipeline, so that the flue gas can be washed by the water washing tower and then flow into the absorption tower to capture carbon dioxide in the flue gas.

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