Two-phase absorbent proportioning tank and carbon capture system

Abstract

The application discloses a two-phase absorbent proportioning storage tank and a carbon capture system. The two-phase absorbent proportioning storage tank comprises a first cylinder, a second cylinder, a plurality of partitions, a liquid supply assembly and a stirring assembly. The first cylinder is sleeved outside the second cylinder. The second cylinder has a first cavity. The first cylinder and the second cylinder define a second cavity. The plurality of partitions are arranged in the second cavity and divide the second cavity into a first chamber, a second chamber and a plurality of third chambers. The first chamber is used for storing lean phase solution separated by a phase separation device. The second chamber is used for storing lean liquid obtained after regeneration by a regeneration tower. The plurality of third chambers are used for respectively storing different components of the absorbent. The liquid supply assembly is arranged between each chamber in the second cavity and the first cavity. The stirring assembly is arranged in the first cavity. The application can store and proportionally adjust the absorbent before entering the absorption tower, optimize the proportioning of each component in the two-phase absorbent, and improve the efficiency and effect of carbon capture in the subsequent absorption tower.

Description

Technical Field

[0001] This invention belongs to the field of carbon capture technology, specifically relating to a two-phase absorbent ratio storage tank and a carbon capture system. Background Technology

[0002] In the phase change carbon dioxide capture process, the absorbent, after absorbing carbon dioxide, automatically separates into a rich phase liquid and a lean phase liquid in the phase separation device, realizing the redistribution of the absorbent after carbon dioxide absorption. The rich phase liquid, enriched with carbon dioxide, is pumped to a regeneration tower for heating and regeneration (the lean liquid after regeneration is then returned to the absorption tower for reuse); the lean phase liquid is directly pumped back to the absorption tower for reuse, reducing the amount of liquid flowing into the regeneration tower.

[0003] In two-phase absorbents, there exists an optimal ratio among the components (such as organic amines, phase-separating agents, and water). However, in related technologies, the two streams of lean liquid and lean phase liquid after regeneration are directly returned to the absorber tower. Due to the different compositions of the lean liquid and lean phase liquid after regeneration, the two streams are not mixed evenly. Furthermore, during system operation, solvent degradation, amine escape, and water evaporation can lead to a decrease in amine and water content in the solvent, resulting in a possible deviation between the absorbent composition returned to the top of the absorber tower and the optimal values. Summary of the Invention

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

[0005] Therefore, embodiments of the present invention propose a two-phase absorbent ratio storage tank, which can store and adjust the ratio of absorbent before it enters the absorption tower, optimize the ratio of each component in the two-phase absorbent, and improve the efficiency and effect of carbon capture in the subsequent absorption tower.

[0006] Embodiments of the present invention also propose a two-phase absorbent carbon capture system.

[0007] A two-phase absorbent mixing tank according to an embodiment of the present invention includes:

[0008] A first cylindrical body and a second cylindrical body, wherein the first cylindrical body is sleeved on the outside of the second cylindrical body, the second cylindrical body has a first cavity, and a second cavity is defined between the first cylindrical body and the second cylindrical body;

[0009] Multiple partitions are disposed in the second cavity, dividing the second cavity into a first chamber, a second chamber, and multiple third chambers. The first chamber is used to store the lean phase solution separated by the phase separation device, the second chamber is used to store the lean liquid obtained after regeneration by the regeneration tower, and the multiple third chambers are used to store different components of the absorbent respectively.

[0010] A liquid supply assembly is disposed between each chamber in the second cavity and the first cavity, through which the solution in each chamber of the second cavity is supplied into the first cavity;

[0011] A stirring assembly is disposed in the first cavity and is used to mix and stir the solution delivered into the first cavity.

[0012] In this embodiment of the invention, the arrangement of the first cylinder, the second cylinder, and the partition plate forms multiple relatively independent chambers, which facilitates the storage of different solutions and the stirring of the mixed solutions. It also facilitates the adjustment of the components in the solution before the absorbent enters the absorption tower, ensuring that each component in the absorbent is within the optimal ratio range and improving the carbon dioxide capture effect of the absorbent entering the absorption tower. Compared with the prior art, which increases the flow rate of the absorbent to meet the carbon dioxide capture effect, this embodiment of the invention improves the capture effect by reasonably adjusting the component ratio of the absorbent and reducing the amount of absorbent introduced into the absorption tower.

[0013] In some embodiments, the two-phase absorbent mixing tank further includes a component monitoring component connected to the first chamber, the second chamber, and the first cavity. The component monitoring component is used to monitor the solution components in the first chamber and the second chamber, as well as the solution components at the outlet of the first cavity.

[0014] The component monitoring component of this invention can monitor the solution composition ratio in the first and second chambers, thereby enabling the mixing of the lean phase solution separated by the phase separation device and the lean liquid obtained after regeneration in a certain proportion. Based on the monitoring data of the solution composition at the outlet of the first chamber, the component that needs to be added is determined, and the flow rate of the component in the corresponding third chamber into the first chamber is adjusted to control the solution composition at the outlet of the first chamber within the optimal composition ratio range, thereby improving the application effect of the absorbent.

[0015] In some embodiments, the two-phase absorbent mixing tank further includes a control system connected to the component monitoring component and the liquid supply component, for controlling the flow rate of the solution delivered to the first chamber by each of the liquid supply components, so as to adjust the solution composition at the outlet of the first chamber.

[0016] The control system of this invention can convert the data monitored by the component monitoring component into control signals, control the operation of each liquid supply component, adjust the flow rate of the solution delivered to the first chamber by each liquid supply component, realize automated control, improve practicality, and contribute to the long-term stable operation of the carbon capture system.

[0017] In some embodiments, each chamber in the first cavity and the second cavity is provided with a breathing valve and a temperature detection component;

[0018] And / or, it also includes a cooling assembly disposed on the outer wall of the first cylinder, or the cooling assembly disposed in at least a portion of the chamber of the second cavity, or the cooling assembly disposed at the outlet of the first cavity.

[0019] By incorporating a breather valve and a temperature detection component, this invention enables better control of the pressure and temperature within each chamber, ensuring internal pressure and temperature stability, making the liquid supply assembly operate more stably, and preventing the solvent in each chamber from being contaminated by the external environment. Simultaneously, by adjusting the temperature of the absorbent, the temperature of the absorbent entering the absorption tower can be kept within the effective absorption reaction range, thereby improving the carbon capture effect.

[0020] The two-phase absorbent carbon capture system of this invention includes an absorption tower, a regeneration tower, and a proportioning tank, wherein the proportioning tank is a two-phase absorbent proportioning tank as described in any of the above embodiments.

[0021] The absorption tower has an absorption chamber and a phase separation chamber arranged sequentially from top to bottom inside the tower body. The side wall of the tower body is provided with a rich phase solution outlet and a poor phase solution outlet. The rich phase solution outlet and the poor phase solution outlet are connected to the phase separation chamber. The rich phase solution outlet is used to pump out the rich phase solution separated from the phase separation chamber, and the poor phase solution outlet is used to pump out the poor phase solution separated from the phase separation chamber.

[0022] The outlet of the lean phase solution is connected to the first chamber of the proportioning tank, the outlet of the rich phase solution is connected to the solution inlet of the regeneration tower, the solution outlet of the regeneration tower is connected to the second chamber of the proportioning tank, and the outlet of the first chamber of the proportioning tank is connected to the absorbent inlet of the absorption tower.

[0023] The two-phase absorbent carbon capture system of this invention can mix different streams of material in a mixing tank, so that the absorbent entering the absorption tower is within the optimal composition ratio range, thereby improving the absorption effect of the absorption tower, reducing the amount of absorbent entering the absorption tower, and ensuring the carbon capture effect of the flue gas.

[0024] In some embodiments, a first pump is provided between the outlet of the lean phase solution and the first chamber of the proportioning tank, a second pump is provided between the outlet of the rich phase solution and the solution inlet of the regeneration tower, a third pump is provided between the solution outlet of the regeneration tower and the second chamber of the proportioning tank, and a fourth pump is provided between the outlet of the first chamber of the proportioning tank and the absorbent inlet of the absorption tower.

[0025] And / or, it also includes a lean-rich solution heat exchanger having a first flow channel and a second flow channel, the first flow channel being connected in series in a pipe between the outlet of the rich phase solution and the inlet of the regeneration tower, and the second flow channel being connected in series in a pipe between the outlet of the regeneration tower and the second chamber of the proportioning tank, and the solution flowing through the first flow channel and the second flow channel undergoes indirect heat exchange.

[0026] In this embodiment of the invention, the use of multiple pumps enables the solution to circulate effectively between different devices, thereby forming a stable carbon capture system. The lean-rich liquid heat exchanger allows the rich-phase solution discharged from the outlet to exchange heat with the lean liquid after regeneration in the regeneration tower, increasing the temperature of the rich-phase solution entering the regeneration tower and decreasing the temperature of the lean liquid, thus improving energy utilization.

[0027] In some embodiments, the absorption tower further includes a liquid collection assembly and a first flow stabilizing assembly. The liquid collection assembly is located at the top of the phase separation chamber and has a first drain port located in the middle of the phase separation chamber. The liquid collection assembly is used to collect the absorbent falling from the absorption chamber and transport it to the middle of the phase separation chamber.

[0028] The first flow stabilizing component is located in the middle of the phase separation cavity. The first flow stabilizing component includes a first flow stabilizing element and a second flow stabilizing element. The first flow stabilizing element is located below the first drain port, and the second flow stabilizing element is located above the first drain port. The first flow stabilizing element and the second flow stabilizing element are arranged vertically opposite each other to guide the absorbent entering the phase separation cavity to diffuse in the horizontal direction.

[0029] The rich phase solution outlet is located below the first flow stabilizing component, and the lean phase solution outlet is located above the first flow stabilizing component.

[0030] The absorption tower of this invention integrates a phase separation function, reducing the floor space required for a separate phase separator. It allows the rich liquid after carbon dioxide absorption to directly separate into phases within the phase separation chamber, enabling the separated rich phase solution to flow to the regeneration tower for regeneration, and the separated lean phase solution to flow to the proportioning tank. This avoids the rich liquid needing to be transferred between the absorption tower and the phase separator, reducing energy consumption. Furthermore, the liquid collection assembly in this embodiment allows the collected rich liquid to be directly transported to the center of the phase separation chamber. The first and second flow stabilizers of the first flow stabilizing assembly stabilize the flow of the rich liquid into the phase separation chamber, preventing significant vertical disturbances. This allows the rich liquid entering the phase separation chamber to diffuse horizontally in the center and gradually separate into phases and strata, thereby reducing the proportion of the rich phase solution and lowering energy consumption during the regeneration stage.

[0031] In some embodiments, the liquid collection assembly includes a first plate and a first pipe connected to each other. The circumferential edge of the first plate is connected to the inner wall of the tower body and a liquid collection cavity is formed above the first plate. One end of the first pipe is connected to the liquid collection cavity, and the other end of the first pipe is a first drain port. The absorbent in the liquid collection cavity flows into the phase separation cavity along the first pipe.

[0032] In this embodiment of the invention, the first plate can separate the absorption chamber and the phase separation chamber, preventing the rich liquid falling from the absorption chamber from directly landing on the surface of the solution in the phase separation chamber, which would lead to a decrease in the quality of the separated lean phase solution. In addition, the solution in the phase separation chamber is divided into lean phase solution, mixed solution and rich phase solution in the vertical direction. In this embodiment of the invention, the first tube can guide the rich liquid in the collection chamber to flow to the middle of the phase separation chamber, so that the rich liquid diffuses in the middle region of the phase separation chamber (the region where the mixed solution is located), reducing the disturbance to the regions where the lean phase solution is located and the regions where the rich phase solution is located, and improving the phase separation effect and efficiency.

[0033] In some embodiments, the first flow stabilizer includes a second plate, the middle portion of which corresponds to the first drain port, and the circumferential edge of the second plate extends away from the first pipe and is inclined upward.

[0034] The second flow stabilizer includes a third plate, which is vertically opposite to the second plate. The third plate is sleeved on the first tube, and the circumferential edge of the third plate extends away from the first tube. The horizontal distance between the circumferential edge of the third plate and the first tube is greater than the horizontal distance between the circumferential edge of the second plate and the first tube.

[0035] In this embodiment of the invention, the second plate blocks and guides the rich liquid entering the phase separation chamber through the first drain port, reducing the disturbance intensity to the solution below the second plate. At the same time, it guides the rich liquid away from the first tube and causes the rich liquid to flow upward at an angle. In this embodiment of the invention, the third plate further guides and stabilizes the flow of the rich liquid after it has been guided and redirected by the second plate, reducing the kinetic energy of the rich liquid and allowing the rich liquid between the second and third plates to gradually become stable and diffuse in a roughly horizontal direction, thereby improving the phase separation effect and efficiency.

[0036] In some embodiments, the absorption tower further includes a second flow stabilizing component, the second flow stabilizing component comprising:

[0037] The fourth plate is disposed in the phase separation cavity and is located below the first current stabilizing component. The fourth plate divides the phase separation cavity into a fourth chamber located above the fourth plate and a fifth chamber located below the fourth plate. The rich phase solution outlet is connected to the fifth chamber.

[0038] Multiple second tubes are connected to the fourth plate. One end of each second tube is connected to the fourth chamber, and the other end of each second tube is a second drain outlet located in the fifth chamber. The vertical height of the second drain outlet is lower than that of the rich phase solution outlet.

[0039] The second flow stabilizing component in this embodiment of the invention allows the rich phase solution to flow into the fifth chamber first and then be pumped out through the rich phase solution outlet. At the same time, it makes the rich phase solution at the bottom of the fourth chamber, which is on the same horizontal plane, enter the fifth chamber more uniformly and consistently. This avoids large disturbances in areas close to the rich phase solution outlet due to the pumping out of the rich phase solution, and also prevents the rich phase solution in areas far from the rich phase solution outlet from failing to converge to the outlet in time, thus affecting the uniformity of the distribution of the rich phase solution in the phase separation chamber and the pumping effect. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the two-phase absorbent ratio storage tank according to an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of the connection structure between the first cylinder and the second cylinder in an embodiment of the present invention.

[0042] Figure 3 This is a schematic diagram of the structure of the two-phase absorbent carbon capture system according to an embodiment of the present invention.

[0043] Figure 4 This is a schematic diagram of the absorption tower in an embodiment of the present invention.

[0044] Figure 5 This is a schematic diagram of the structure of the first current stabilizing component in an embodiment of the present invention.

[0045] Figure label:

[0046] 100. Two-phase absorbent mixing tank;

[0047] 11. First cylinder; 12. Second cylinder; 13. Partition; 14. First cavity; 15. Second cavity; 151. First chamber; 152. Second chamber; 153. Third chamber; 154. Sampling port;

[0048] 2. Liquid supply assembly; 21. Solution pump; 22. First valve;

[0049] 3. Stirring assembly; 31. First actuator; 32. Stirring shaft; 33. Stirring blades;

[0050] 41. Component monitoring components; 42. Control system; 43. Cooling components;

[0051] 200. Two-phase absorbent carbon capture system;

[0052] 5. Absorption tower;

[0053] 51. Tower body; 511. Absorption chamber; 512. Phase separation chamber; 5121. Fourth chamber; 5122. Fifth chamber; 513. Rich phase solution outlet; 514. Lean phase solution outlet;

[0054] 52. Liquid collection assembly; 521. First plate; 522. First pipe; 523. Liquid collection chamber; 524. First drain port;

[0055] 53. First flow stabilizing component; 531. First flow stabilizing element; 5311. First flow diverter; 532. Second flow stabilizing element; 5321. First annular section; 5322. Second annular section; 5323. Third annular section; 5324. Second flow diverter; 533. First frame;

[0056] 54. Overflow channel;

[0057] 55. Second flow stabilizing component; 551. Fourth plate; 552. Second pipe; 5521. Second drain port;

[0058] 6. Regeneration tower;

[0059] 71. First pump; 72. Second pump; 73. Third pump; 74. Fourth pump; 75. Lean / rich liquid heat exchanger. Detailed Implementation

[0060] 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.

[0061] The carbon capture system of the two-phase absorbent ratio storage tank 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0062] According to an embodiment of the present invention, a two-phase absorbent mixing tank 100 includes a first cylinder 11 and a second cylinder 12. The first cylinder 11 is sleeved on the outside of the second cylinder 12, the second cylinder 12 has a first cavity 14, and a second cavity 15 is defined between the first cylinder 11 and the second cylinder 12.

[0063] Multiple partitions 13 are provided in the second chamber 15, dividing the second chamber 15 into a first chamber 151, a second chamber 152, and multiple third chambers 153. The first chamber 151, the second chamber 152, and the multiple third chambers 153 are arranged circumferentially in the second chamber 15. The first chamber 151 is used to store the lean phase solution separated by the phase separation device, the second chamber 152 is used to store the lean liquid obtained after regeneration by the regeneration tower 6, and the multiple third chambers 153 are used to store different components of the absorbent respectively. The volume of the first chamber 151 and the second chamber 152 is larger than that of the third chamber 153, ensuring that there is enough volume to store the lean phase solution and the regenerated lean liquid.

[0064] This embodiment of the invention also includes a liquid supply assembly 2 and a stirring assembly 3. The liquid supply assembly 2 is disposed between each chamber in the second cavity 15 and the first cavity 14. The solution in each chamber of the second cavity 15 is transported into the first cavity 14 through the liquid supply assembly 2. The stirring assembly 3 is disposed in the first cavity 14 and is used to mix and stir the solution transported into the first cavity 14.

[0065] In this embodiment of the invention, the arrangement of the first cylinder 11, the second cylinder 12 and the partition 13 can form multiple relatively independent chambers, which facilitates the storage of different solutions and the stirring of the mixed solutions. It also facilitates the adjustment of the components in the solution before the absorbent enters the absorption tower 5, ensuring that each component in the absorbent is within the optimal ratio range, and improving the carbon dioxide capture effect of the absorbent entering the absorption tower 5.

[0066] Compared to existing technologies, due to the unreasonable composition ratio of the absorbent, it is necessary to increase the flow rate of the absorbent to meet the carbon dioxide capture effect in the absorption tower 5. This embodiment of the invention improves the capture effect by reasonably adjusting the composition ratio of the absorbent, reducing the amount of absorbent introduced into the absorption tower 5.

[0067] In some embodiments, the two-phase absorbent mixing tank 100 further includes a component monitoring component 41, which is connected to the first chamber 151, the second chamber 152 and the first cavity 14. The component monitoring component 41 is used to monitor the solution components in the first chamber 151 and the second chamber 152, as well as the solution components at the outlet of the first cavity 14.

[0068] The component monitoring component 41 of this invention can monitor the solution composition ratio in the first chamber 151 and the second chamber 152, thereby enabling the mixing of the lean phase solution separated by the phase separation device and the lean liquid obtained after regeneration in a certain proportion. Based on the monitoring data of the solution composition at the outlet of the first chamber 14, the component that needs to be added is determined, and the flow rate of the component in the corresponding third chamber 153 into the first chamber 14 is adjusted to control the solution composition at the outlet of the first chamber 14 to be within the optimal composition ratio range, thereby improving the application effect of the absorbent.

[0069] Optionally, sampling ports 154 are provided at the outlets of the first chamber 151, the second chamber 152, and the first cavity 14. The sampling ports 154 are connected to the component monitoring components 41. There can be one or more component monitoring components 41. When there are multiple component monitoring components 41, the first chamber 151, the second chamber 152, and the first cavity 14 are each connected to a component monitoring component 41. When there is only one component monitoring component 41, they can share one component monitoring component 41. During detection, the component ratio of the solution in the corresponding chamber is obtained by intermittent alternating detection.

[0070] Furthermore, multiple third chambers 153 are also connected to component monitoring components 41 to obtain information such as the corresponding component concentrations, ensuring that the absorbent ratio is more accurate after the solutions in multiple chambers are mixed.

[0071] The component monitoring component 41 can be monitored using liquid chromatography.

[0072] In some embodiments, the two-phase absorbent ratio storage tank 100 further includes a control system 42, which is connected to the component monitoring component 41 and the liquid supply component 2, and is used to control the flow rate of the solution delivered to the first chamber 14 by each liquid supply component 2, so as to adjust the solution composition at the outlet of the first chamber 14.

[0073] The control system 42 of this embodiment can convert the data monitored by the component monitoring component 41 into control signals, control the operation of each liquid supply component 2, and adjust the flow rate of the solution delivered by each liquid supply component 2 to the first chamber 14, thereby achieving automated control, improving practicality, and contributing to the long-term stable operation of the carbon capture system.

[0074] Optionally, the liquid supply assembly 2 includes a solution pump 21 and a first valve 22. The inlet of the solution pump 21 is connected to a chamber in the second cavity 15, and the outlet of the solution pump 21 is connected to the first cavity 14. The first valve 22 is located between the outlet of the solution pump 21 and the first cavity 14, or between the inlet of the solution pump 21 and a chamber (first chamber 151, second chamber 152, third chamber 153) in the second cavity 15 to regulate the flow rate of the solution delivered into the first cavity 14 by the solution pump 21.

[0075] The first valve 22 is an electromagnetic flow regulating valve.

[0076] When a component of the absorbent supplied to the absorption tower 5 is deficient, the solution containing the corresponding component in the third chamber 153 is meteredly pumped into the first chamber 14 via the liquid supply assembly 2. Since the consumption of different components varies during system operation, and the system load also varies, the carbon capture efficiency can be improved by real-time adjustment of the absorbent components within the optimal ratio range.

[0077] In some embodiments, each chamber in the first cavity 14 and the second cavity 15 is equipped with a breather valve and a temperature detection component. By incorporating the breather valve and temperature detection component, this embodiment of the invention can better control the pressure and temperature within each chamber, ensuring stable internal pressure and temperature, making the liquid supply assembly 2 operate more stably, and also preventing the solvent in each chamber from being contaminated by the external environment.

[0078] Furthermore, the two-phase absorbent mixing tank 100 also includes a cooling assembly 43, which is disposed on the outer wall of the first cylinder 11, or disposed in at least a portion of the chamber in the second cavity 15, or disposed at the outlet of the first cavity 14.

[0079] In this embodiment of the invention, the temperature of the absorbent flowing into the absorption tower 5 is adjusted by the cooling component 43, so that the temperature of the absorbent entering the absorption tower 5 is within the effective absorption reaction range, thereby improving the carbon capture effect.

[0080] In this embodiment of the invention, a cooling component 43 can be provided on the outer wall of the first cylinder 11 to cool the solution. For example, a heat exchange tube can be provided on the outer wall of the first cylinder 11, and a cold medium can be introduced into the heat exchange tube to cool the solution inside the second cavity 15.

[0081] Alternatively, the cooling assembly 43 can be installed in the first chamber 151, and / or the second chamber 152, and / or the third chamber 153. For example, cooling coils can be installed in the first chamber 151 and the second chamber 152, and a cooling medium can be introduced into the cooling coils to cool the lean phase solution in the first chamber 151 and the regenerated lean solution in the second chamber 152.

[0082] Alternatively, the cooling component 43 is located at the outlet of the first chamber 14 to cool the absorbent before it is fed into the absorption tower 5. The cooling component 43 is a liquid-liquid heat exchanger, which cools the absorbent flowing through the heat exchanger by introducing a cold medium into the heat exchanger.

[0083] The stirring assembly 3 of this embodiment includes a first driver 31, a stirring shaft 32, and stirring blades 33. The stirring blades 33 are disposed on the stirring shaft 32 and arranged in the first cavity 14. The first driver 31 is connected to the stirring shaft 32. During operation, the first driver 31 drives the stirring shaft 32 and the stirring blades 33 to rotate, thereby stirring the solution in the first cavity 14. The first driver 31 is a motor.

[0084] The two-phase absorbent carbon capture system 200 of this invention includes an absorption tower 5, a regeneration tower 6, and a proportioning tank, wherein the proportioning tank is the two-phase absorbent proportioning tank 100 as described in any of the above embodiments.

[0085] The absorption tower 5 has an absorption chamber 51 and a phase separation chamber 512 arranged sequentially from top to bottom inside the tower body 51. The rich phase solution outlet 513 and the lean phase solution outlet 514 are provided on the side wall of the tower body 51. The rich phase solution outlet 513 and the lean phase solution outlet 514 are connected to the phase separation chamber 512. The rich phase solution outlet 513 is used to pump out the rich phase solution separated from the phase separation chamber 512, and the lean phase solution outlet 514 is used to pump out the lean phase solution separated from the phase separation chamber 512.

[0086] The lean phase solution outlet 514 is connected to the first chamber 151 of the proportioning tank, the rich phase solution outlet 513 is connected to the solution inlet of the regeneration tower 6, the solution outlet of the regeneration tower 6 is connected to the second chamber 152 of the proportioning tank, and the outlet of the first chamber 14 of the proportioning tank is connected to the absorbent inlet of the absorption tower 5.

[0087] The two-phase absorbent carbon capture system 200 of this invention can mix different streams of material in a mixing tank, so that the absorbent entering the absorption tower 5 is within the optimal composition ratio range, thereby improving the absorption effect of the absorption tower 5, reducing the amount of absorbent entering the absorption tower 5, and ensuring the carbon capture effect on the flue gas.

[0088] The absorption tower 5 of this invention integrates a phase separation function, which can avoid the need for a separate phase separation device, reducing the floor space. At the same time, it can directly separate the rich liquid after absorbing carbon dioxide in the phase separation chamber 512, so that the rich phase solution after phase separation flows to the regeneration tower 6 for regeneration, and the lean phase solution after phase separation flows to the proportioning tank, avoiding the rich liquid to be transferred between the absorption tower 5 and the phase separator, thus reducing energy consumption.

[0089] In some embodiments, a first pump 71 is provided between the lean phase solution outlet 514 and the first chamber 151 of the proportioning tank; a second pump 72 is provided between the rich phase solution outlet 513 and the solution inlet of the regeneration tower 6; a third pump 73 is provided between the solution outlet of the regeneration tower 6 and the second chamber 152 of the proportioning tank; and a fourth pump 74 is provided between the outlet of the first chamber 14 of the proportioning tank and the absorbent inlet of the absorption tower 5. By using multiple pumps in this embodiment, the solution can be effectively circulated between different devices, thereby forming a stable carbon capture system.

[0090] The two-phase absorbent carbon capture system 200 also includes a lean-rich liquid heat exchanger 75, which has a first flow channel and a second flow channel. The first flow channel is connected in series in the pipe between the rich phase solution outlet 513 and the solution inlet of the regeneration tower 6, and the second flow channel is connected in series in the pipe between the solution outlet of the regeneration tower 6 and the second chamber 152 of the proportioning tank. The solution flowing through the first flow channel and the second flow channel exchanges heat indirectly.

[0091] The rich-lean liquid heat exchanger 75 enables the rich phase solution discharged from the rich phase solution outlet 513 to exchange heat with the lean liquid after regeneration in the regeneration tower 6, thereby increasing the temperature of the rich phase solution entering the regeneration tower 6 and decreasing the temperature of the lean liquid, thus improving energy utilization.

[0092] Since the regeneration of the rich phase solution requires a temperature of around 120°C, which consumes a large amount of energy, the rich phase solution absorbs the temperature of the lean solution discharged from the regeneration tower 6 through the setting of the lean-rich solution heat exchanger 75, thereby increasing the temperature of the rich phase solution and reducing the energy consumption of the rich phase solution during the regeneration process. At the same time, since the absorbent in the absorption tower 5 requires a temperature of around 40°C for carbon capture, the temperature of the lean solution discharged from the regeneration tower 6 can be reduced after exchanging heat with the rich phase solution, thereby reducing the energy consumed in the subsequent cooling of the lean solution and improving the energy utilization rate of the system.

[0093] In some embodiments, the absorption tower 5 further includes a liquid collection assembly 52 and a first flow stabilizing assembly 53. The liquid collection assembly 52 is located at the top of the phase separation chamber 512 and has a first drain port 524 located in the middle of the phase separation chamber 512. The liquid collection assembly 52 is used to collect the absorbent falling from the absorption chamber 511 and transport it to the middle of the phase separation chamber 512.

[0094] The first flow stabilizing component 53 is located in the middle of the phase separation chamber 512. The first flow stabilizing component 53 includes a first flow stabilizing element 531 and a second flow stabilizing element 532. The first flow stabilizing element 531 is located below the first drain port 524, and the second flow stabilizing element 532 is located above the first drain port 524. The first flow stabilizing element 531 and the second flow stabilizing element 532 are arranged opposite each other to guide the absorbent entering the phase separation chamber 512 to diffuse in the horizontal direction.

[0095] The rich phase solution outlet 513 is located below the first flow stabilizing component 53, and the lean phase solution outlet 514 is located above the first flow stabilizing component 53.

[0096] In this embodiment of the invention, the liquid collection component 52 is configured to directly transport the rich liquid collected by the liquid collection component 52 to the middle of the phase separation chamber 512. The first flow stabilizer 531 and the second flow stabilizer 532 of the first flow stabilizing component 53 can stabilize the flow of the rich liquid flowing into the phase separation chamber 512, avoiding large disturbances in the vertical direction of the rich liquid in the phase separation chamber 512. This allows the rich liquid entering the phase separation chamber 512 to diffuse horizontally in the middle of the phase separation chamber 512 and gradually separate into phases and layers, thereby reducing the proportion of the rich phase solution and reducing the energy consumption in the regeneration stage.

[0097] In some embodiments, the liquid collection assembly 52 includes a first plate 521 and a first pipe 522 connected to each other. The circumferential edge of the first plate 521 is connected to the inner wall of the tower body 51, and a liquid collection cavity 523 is formed above the first plate 521. One end of the first pipe 522 is connected to the liquid collection cavity 523, and the other end of the first pipe 522 is a first drain port 524. The absorbent in the liquid collection cavity 523 flows into the phase separation cavity 512 along the first pipe 522.

[0098] In this embodiment of the invention, the first plate 521 can separate the absorption chamber 511 and the phase separation chamber 512, preventing the rich liquid falling from the absorption chamber 511 from directly landing on the liquid surface of the solution in the phase separation chamber 512, which would lead to a decrease in the quality of the separated lean phase solution. In addition, the solution in the phase separation chamber 512 is divided into lean phase solution, mixed solution and rich phase solution in the vertical direction. In this embodiment of the invention, the first tube 522 can guide the rich liquid in the collection chamber 523 to flow to the middle of the phase separation chamber 512, so that the rich liquid diffuses in the middle region of the phase separation chamber 512 (the region where the mixed solution is located), reducing the disturbance to the region where the lean phase solution is located and the region where the rich phase solution is located, and improving the phase separation effect and efficiency.

[0099] Furthermore, there are multiple first tubes 522, which are arranged in parallel and spaced apart in the phase separation cavity 512. Each first tube 522 has a corresponding first flow stabilizing component 53 at its first drain port 524.

[0100] The number of first tubes 522 can be 2-20, specifically 2, 4, 5, 7, 10, 15, 18, or 20. The flow area of ​​a single first tube 522 and the number of first tubes 522 are determined based on the cross-sectional dimensions of the tower body 51 and the rich liquid flow rate.

[0101] Optionally, the inner cavity of the tower body 51 has a rectangular cross-section, and the cross-sections of the absorption cavity 511 and the phase separation cavity 512 are also rectangular. The length of the absorption cavity 511 and the phase separation cavity 512 can reach 16000mm and the width can reach 12000mm. At this time, 4-16 first tubes 522 can be set, and the diameter of a single first tube 522 is 300mm to 1000mm. For example, when the number of first tubes 522 is 4, the diameter of the first tube 522 can be 800mm, 850mm, 900mm, 984mm or 1000mm. For another example, when the number of first tubes 522 is 10, the diameter of the first tube 522 is 400mm, 450mm or 500mm.

[0102] In this embodiment of the invention, the phase separation cavity 512 has a large cross-sectional size. By arranging multiple first tubes 522, the liquid flow rate of a single first tube 522 can be reduced, thereby reducing the disturbance intensity of the solution at the corresponding position. This allows the rich liquid in the liquid collection cavity 523 to be dispersed at different positions in the middle region of the phase separation cavity 512 through multiple first tubes 522, thereby improving the stability of the phase separation and stratification of the solution in the phase separation cavity 512.

[0103] In some embodiments, the first flow stabilizer 531 includes a second plate, the middle portion of which corresponds to the first drain port 524, and the circumferential edge of the second plate extends away from the first pipe 522 and is inclined upward; the second flow stabilizer 532 includes a third plate, which is disposed opposite to the second plate in the vertical direction, and the third plate is sleeved on the first pipe 522, the circumferential edge of the third plate extends away from the first pipe 522, and the distance between the circumferential edge of the third plate and the first pipe 522 in the horizontal direction is greater than the distance between the circumferential edge of the second plate and the first pipe 522 in the horizontal direction.

[0104] In this embodiment of the invention, the second plate blocks and guides the rich liquid entering the phase separation chamber 512 through the first drain port 524, reducing the disturbance intensity to the solution below the second plate. At the same time, it guides the rich liquid away from the first pipe 522 and causes the rich liquid to flow upward at an angle. In this embodiment of the invention, the third plate further guides and stabilizes the flow of the rich liquid after it has been guided and redirected by the second plate, reducing the kinetic energy of the rich liquid and allowing the rich liquid between the second and third plates to gradually become stable and diffuse in a roughly horizontal direction, thereby improving the phase separation effect and efficiency.

[0105] Optionally, the circumferential edge of the second plate is annular, and the circumferential edge of the second plate is coaxially arranged with the first tube 522. When the rich liquid flowing out of the first tube 522 falls onto the second plate, it can be blocked by the second plate to reduce its kinetic energy. At this time, the rich liquid is in the middle region of the solution in the phase separation chamber 512, and its kinetic energy can be reduced by the existing solution in the phase separation chamber 512.

[0106] Optionally, the second plate is approximately hemispherical or approximately frustum-shaped, forming an approximately hemispherical shell structure or an approximately frustum-shaped shell structure.

[0107] Furthermore, the third plate has a first annular section 5321, a second annular section 5322, and a third annular section 5323 arranged sequentially in a direction away from the first pipe 522. The first annular section 5321 is inclined upward from the side closer to the first pipe 522 to the side away from the first pipe 522, and the third annular section 5323 is inclined downward from the side closer to the first pipe 522 to the side away from the first pipe 522.

[0108] In this embodiment of the invention, by segmenting the third plate, the first annular section 5321 can reduce the flow resistance of the rich liquid, allowing the rich liquid flowing into the phase separation cavity 512 to spread horizontally as quickly as possible. The second annular section 5322 smoothly transitions between the first annular section 5321 and the third annular section 5323, guiding the rich liquid to flow downward. At this time, the kinetic energy of the rich liquid in the vertical direction is reduced, and the rich liquid can spread as much as possible in the middle region of the phase separation cavity 512 when it spreads horizontally, causing the liquid level in the middle region to rise steadily as a whole. This can reduce the disturbance to the upper lean phase solution of the phase separation cavity 512 and prevent the upper lean phase solution of the phase separation cavity 512 from boiling.

[0109] Both the first annular segment 5321 and the third annular segment 5323 are frustoconical in shape.

[0110] Optionally, the angle between the first annular section 5321 and the horizontal plane is 30° to 60°, for example, 30°, 33°, 42°, 45°, 47°, 51°, 53.8°, 58.3° or 60°. When the angle between the first annular section 5321 and the horizontal plane is less than 30°, it is easy to cause the overall structure of the third plate to be too large, and the distance between the circumferential edge of the third plate and the first pipe 522 to be too large, which affects the distribution of the rich liquid and is not conducive to the diffusion of the rich liquid to the top of the third plate. When the angle between the first annular section 5321 and the horizontal plane is greater than 60°, it is easy to cause the flow resistance of the rich liquid to be too large, which is not conducive to the diffusion of the rich liquid and makes it difficult for the rich liquid to flow in the first pipe 522.

[0111] The angle between the third annular section 5323 and the horizontal plane is 10° to 25°. For example, the angle between the third annular section 5323 and the horizontal plane is 10°, 11°, 13°, 17°, 20°, 24.6° or 25°. When the angle between the third annular section 5323 and the horizontal plane is less than 10°, the rich liquid diffused to the outer side of the third plate in the horizontal direction tends to surge upward, which can easily cause a large disturbance to the upper layer solution of the phase separation chamber 512. When the angle between the third annular section 5323 and the horizontal plane is greater than 25°, it affects the diffusion of the rich liquid in the horizontal direction, which can easily cause a disturbance to the lower layer solution of the phase separation chamber 512, which is not conducive to the phase separation of the rich liquid.

[0112] Furthermore, the second plate has a plurality of first diversion grooves 5311, which are arranged at intervals along the circumference of the second plate. The first diversion grooves 5311 extend in a direction away from the first pipe 522, and the cross-sectional dimensions of the first diversion grooves 5311 gradually increase from the end closer to the first pipe 522 to the end away from the first pipe 522.

[0113] The third plate has a plurality of second diversion channels 5324, which are arranged at intervals along the circumference of the third plate. The second diversion channels 5324 extend in a direction away from the first pipe 522, and the cross-sectional dimensions of the second diversion channels 5324 gradually increase from the end closer to the first pipe 522 to the end away from the first pipe 522.

[0114] The arrangement of the first diversion groove 5311 and the second diversion groove 5324 on the second and third plates in this embodiment of the invention enables the diversion of the rich liquid between the second and third plates, allowing some of the rich liquid to flow out through the first diversion groove 5311 and the second diversion groove 5324. Furthermore, during the flow of the rich liquid between the second and third plates, the solution with a predominantly rich phase can flow down to the second plate through the first diversion groove 5311, while the solution with a predominantly poor phase can flow up to the third plate through the second diversion groove 5324. In this embodiment of the invention, the rich liquid entering the phase separation cavity 512 can diffuse and separate more quickly, reducing the amount of rich liquid after being guided by the third plate and improving the uniformity of the distribution of the rich liquid in the middle region of the phase separation cavity 512.

[0115] In some embodiments, the first flow stabilizing assembly 53 further includes a first frame 533, which is connected to the tower body 51. The first flow stabilizer 531 and the second flow stabilizer 532 are connected to the first frame 533. It should be understood that both the first flow stabilizer 531 and the second flow stabilizer 532 will be subjected to a certain impact force from the rich liquid. Therefore, by arranging the first frame 533 inside the tower body 51 and fixing the first flow stabilizer 531 and the second flow stabilizer 532 to the first frame 533, the impact force borne by the first flow stabilizer 531 and the second flow stabilizer 532 can be transferred to the tower body 51, thereby improving the structural stability of the first flow stabilizing assembly 53.

[0116] For example, the first frame 533 includes multiple support beams, the two ends of which are connected and fixed to support seats provided on the inner wall of the phase separation cavity 512. The first current stabilizer 531 and the second current stabilizer 532 are welded and fixed to the support beams or fixed by bolts.

[0117] In some embodiments, the absorption tower 5 further includes a second flow stabilizing component 55, which includes a fourth plate 551. The fourth plate 551 is disposed in the phase separation chamber 512 and is located below the first flow stabilizing component 53. The fourth plate 551 divides the phase separation chamber 512 into a fourth chamber 5121 located above the fourth plate 551 and a fifth chamber 5122 located below the fourth plate 551. The rich phase solution outlet 513 is connected to the fifth chamber 5122.

[0118] Multiple second tubes 552 are connected to the fourth plate 551. One end of the second tube 552 is connected to the fourth chamber 5121, and the other end of the second tube 552 is the second drain port 5521. The second drain port 5521 is located in the fifth chamber 5122, and the height of the second drain port 5521 in the vertical direction is lower than that of the rich phase solution outlet 513.

[0119] It should be understood that most or all of the rich phase solution flowing into the fifth chamber 5122 originates from the fourth chamber 5121 and flows into the fifth chamber 5122 through the second pipe 552. Since the rich phase solution outlet 513 is located above the second drain port 5521, the pumping out of the rich phase solution in the fifth chamber 5122 will not disturb the solution in the fourth chamber 5121. This solves the problem of draining the rich phase solution in the ultra-large cross-section phase separation chamber 512, making the solution in the phase separation chamber 512 more stable and improving the phase separation effect and efficiency.

[0120] The number of second tubes 552 can be 4 to 40. Specifically, the number of second tubes 552 can be 4, 7, 10, 13, 19, 21, 24, 28, 36 or 40.

[0121] Multiple second tubes 552 are arranged in a rectangular array or a circular array.

[0122] The second flow stabilizing component 55 in this embodiment of the invention allows the rich phase solution to flow into the fifth chamber 5122 first, and then be discharged from the rich phase solution outlet 513. At the same time, it makes the rich phase solution at the bottom of the fourth chamber 5121, which is on the same horizontal plane, enter the fifth chamber 5122 more uniformly and consistently. This avoids large disturbances in the area close to the rich phase solution outlet due to the discharge of the rich phase solution, and also prevents the rich phase solution in the area far from the rich phase solution outlet from failing to converge to the rich phase solution outlet in time, thus affecting the uniformity of the distribution of the rich phase solution in the phase separation chamber 512 and the effect of the discharge.

[0123] Furthermore, the fourth plate 551 is provided with a connecting hole, which is used to connect the fourth chamber 5121 and the fifth chamber 5122.

[0124] The connecting holes in this embodiment of the invention can connect the fourth chamber 5121 and the fifth chamber 5122, preventing the rich phase solution from failing to fill the fifth chamber 5122 and improving the pumping effect. Furthermore, the main function of the connecting holes is not to allow the rich phase solution in the fourth chamber 5121 to flow into the fifth chamber 5122 through the connecting holes. Therefore, the number and diameter of the connecting holes should not be too large to avoid causing significant disturbance to the solution in the fourth chamber 5121 during the pumping of the rich phase solution.

[0125] The connecting hole is located in the region of the fourth plate 551 away from the outlet 513 of the rich phase solution. It should be understood that the solution flowing into the fifth chamber 5122 through the connecting hole accounts for a very small proportion of the total amount of solution flowing into the fifth chamber 5122 from the fourth chamber 5121, and the solution flowing directly into the fifth chamber 5122 through the connecting hole will not cause significant disturbance to the solution in the fourth chamber 5121, nor will it affect the phase separation of the solution in the fourth chamber 5121.

[0126] Optionally, the sum of the flow areas of the connecting holes on the fourth plate 551 is less than 1 / 50 of the sum of the flow areas of all the second pipes 552. For example, the sum of the flow areas of the connecting holes on the fourth plate 551 is 1 / 50, 1 / 65, 1 / 76, 1 / 85, 1 / 91, 1 / 100, or 1 / 200 of the sum of the flow areas of all the second pipes 552. This ensures that the gas in the fifth chamber 5122 can enter the fourth chamber 5121 through the connecting holes, allowing the fifth chamber 5122 to be filled with the rich-phase solution as much as possible, thereby improving the pumping efficiency.

[0127] There is a gap between the circumferential edge of the fourth plate 551 and the inner wall of the phase separation chamber 512. This gap can be used to fill the fifth chamber 5122 with the rich liquid as much as possible. When the rich phase solution of the fourth chamber 5121 flows to the fifth chamber 5122 through the gap between the circumferential edge of the fourth plate 551 and the inner wall of the phase separation chamber 512, the disturbance to the solution in the phase separation chamber 512 is small because it is close to the side wall of the phase separation chamber 512.

[0128] When assembling the fourth plate 551, it is not necessary to seal the circumferential edge of the fourth plate 551 with the inner wall of the phase separation cavity 512, which reduces the difficulty and cost of installation.

[0129] By configuring the above-described structure, this embodiment of the invention enables a higher proportion of lean phase solution in the rich solution, increasing the proportion of lean phase solution separated by the phase separator in related technologies by 5-15%. This reduces the amount of rich phase solution flowing to the regeneration stage, thus reducing energy consumption. At the same time, the phase separation efficiency of this embodiment of the invention is further improved. Combined with the design of the proportioning tank, the optimal ratio of absorbent entering the absorption tower 5 can be optimized, improving the efficiency and effect of the carbon capture system, reducing the absorbent input flow rate in the absorption tower 5, and reducing the total amount of absorbent solution circulating in the entire carbon capture system.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A two-phase absorbent carbon capture system, characterized in that, It includes an absorption tower, a regeneration tower, and a proportioning tank, wherein the proportioning tank is a two-phase absorbent proportioning tank, and the two-phase absorbent proportioning tank includes: A first cylindrical body and a second cylindrical body, wherein the first cylindrical body is sleeved on the outside of the second cylindrical body, the second cylindrical body has a first cavity, and a second cavity is defined between the first cylindrical body and the second cylindrical body; Multiple partitions are disposed in the second cavity, dividing the second cavity into a first chamber, a second chamber, and multiple third chambers. The first chamber is used to store the lean phase solution separated by the phase separation device, the second chamber is used to store the lean liquid obtained after regeneration by the regeneration tower, and the multiple third chambers are used to store different components of the absorbent respectively. A liquid supply assembly is disposed between each chamber in the second cavity and the first cavity, through which the solution in each chamber of the second cavity is supplied into the first cavity; A stirring assembly is disposed in the first cavity and is used to mix and stir the solution delivered into the first cavity. The absorption tower has an absorption chamber and a phase separation chamber arranged sequentially from top to bottom inside the tower body. The side wall of the tower body is provided with a rich phase solution outlet and a poor phase solution outlet. The rich phase solution outlet and the poor phase solution outlet are connected to the phase separation chamber. The rich phase solution outlet is used to pump out the rich phase solution separated from the phase separation chamber, and the poor phase solution outlet is used to pump out the poor phase solution separated from the phase separation chamber. The outlet of the lean phase solution is connected to the first chamber of the proportioning tank, the outlet of the rich phase solution is connected to the solution inlet of the regeneration tower, the solution outlet of the regeneration tower is connected to the second chamber of the proportioning tank, and the outlet of the first chamber of the proportioning tank is connected to the absorbent inlet of the absorption tower. The absorption tower further includes a liquid collection assembly, a first flow stabilizing assembly, and a second flow stabilizing assembly. The liquid collection assembly is located at the top of the phase separation chamber and has a first drain port located in the middle of the phase separation chamber. The liquid collection assembly is used to collect the absorbent falling from the absorption chamber and transport it to the middle of the phase separation chamber. The first flow stabilizing component is located in the middle of the phase separation cavity. The first flow stabilizing component includes a first flow stabilizing element and a second flow stabilizing element. The first flow stabilizing element is located below the first drain port, and the second flow stabilizing element is located above the first drain port. The first flow stabilizing element and the second flow stabilizing element are arranged vertically opposite each other to guide the absorbent entering the phase separation cavity to diffuse in the horizontal direction. The rich phase solution outlet is located below the first flow stabilizing component, and the lean phase solution outlet is located above the first flow stabilizing component. The second flow stabilizing component includes a fourth plate and a plurality of second tubes. The fourth plate is disposed within the phase separation cavity and is located below the first flow stabilizing component. The fourth plate divides the phase separation cavity into a fourth chamber located above the fourth plate and a fifth chamber located below the fourth plate. The rich phase solution outlet communicates with the fifth chamber. The plurality of second tubes are connected to the fourth plate. One end of the second tube communicates with the fourth chamber, and the other end of the second tube is a second drain outlet located within the fifth chamber. The vertical height of the second drain outlet is lower than that of the rich phase solution outlet.

2. The two-phase absorbent carbon capture system according to claim 1, characterized in that, It also includes a component monitoring component, which is connected to the first chamber, the second chamber and the first cavity, and is used to monitor the solution components in the first chamber and the second chamber, as well as the solution components at the outlet of the first cavity.

3. The two-phase absorbent carbon capture system according to claim 2, characterized in that, It also includes a control system connected to the component monitoring component and the liquid supply component, for controlling the flow rate of the solution delivered to the first cavity by each of the liquid supply components, so as to adjust the solution composition at the outlet of the first cavity.

4. The two-phase absorbent carbon capture system according to claim 1, characterized in that, Each chamber in the first and second cavities is equipped with a breathing valve and a temperature detection component; And / or, it also includes a cooling assembly disposed on the outer wall of the first cylinder, or the cooling assembly disposed in at least a portion of the chamber of the second cavity, or the cooling assembly disposed at the outlet of the first cavity.

5. The two-phase absorbent carbon capture system according to claim 1, characterized in that, A first pump is provided between the outlet of the lean phase solution and the first chamber of the proportioning tank; a second pump is provided between the outlet of the rich phase solution and the solution inlet of the regeneration tower; a third pump is provided between the solution outlet of the regeneration tower and the second chamber of the proportioning tank; and a fourth pump is provided between the outlet of the first chamber of the proportioning tank and the absorbent inlet of the absorption tower. And / or, it also includes a lean-rich solution heat exchanger having a first flow channel and a second flow channel, the first flow channel being connected in series in a pipe between the outlet of the rich phase solution and the inlet of the regeneration tower, and the second flow channel being connected in series in a pipe between the outlet of the regeneration tower and the second chamber of the proportioning tank, and the solution flowing through the first flow channel and the second flow channel undergoes indirect heat exchange.

6. The two-phase absorbent carbon capture system according to claim 1, characterized in that, The liquid collection assembly includes a first plate and a first pipe connected to each other. The circumferential edge of the first plate is connected to the inner wall of the tower body and a liquid collection cavity is formed above the first plate. One end of the first pipe is connected to the liquid collection cavity, and the other end of the first pipe is a first drain port. The absorbent in the liquid collection cavity flows into the phase separation cavity along the first pipe.

7. The two-phase absorbent carbon capture system according to claim 6, characterized in that, The first flow stabilizer includes a second plate, the middle part of which corresponds to the first drain port, and the circumferential edge of the second plate extends away from the first pipe and is inclined upward. The second flow stabilizer includes a third plate, which is vertically opposite to the second plate. The third plate is sleeved on the first tube, and the circumferential edge of the third plate extends away from the first tube. The horizontal distance between the circumferential edge of the third plate and the first tube is greater than the horizontal distance between the circumferential edge of the second plate and the first tube.

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