Centrifugal phase separation device and phase change carbon dioxide capture system

Abstract

The application discloses a centrifugal phase separation device and a phase change type carbon dioxide capture system, and relates to the field of carbon dioxide capture technology.The centrifugal phase separation device comprises a first pipeline, a second pipeline, a centrifugal cylinder and an inner tube, the centrifugal cylinder is arranged between the first pipeline and the second pipeline and rotatably connected with the first pipeline and the second pipeline at both ends, and the inner tube is arranged in the second pipeline and coaxially arranged with the second pipeline, and an annular channel is defined between the inner tube and the second pipeline.The centrifugal phase separation device can realize efficient and complete separation of the rich liquid absorbent in real time under flow conditions, and can simultaneously transport the separated heavy phase absorbent and light phase absorbent into a regeneration tower and an absorption tower respectively, and can realize efficient and complete separation of the rich liquid absorbent under a high flow rate, effectively avoids the poor liquid from entering the regeneration tower, and thus reduces the required heat energy consumption in the CO2 desorption process and improves the overall efficiency and energy consumption of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and in particular to a centrifugal phase separation device and a phase-change carbon dioxide capture system. Background Art

[0002] In the phase change carbon dioxide capture system, the flue gas enters the absorption tower, and the CO2 in the flue gas will be absorbed by the absorbent in the absorption tower. The rich liquid absorbent that absorbs CO2 in the absorption tower will be transported to the phase separator, and the phase separator will separate the rich liquid that absorbs CO2 into a light phase with less CO2 and a heavy phase rich in CO2. The light phase returns to the absorption tower to continue to be circulated and absorbed, while the heavy phase is transported to the regeneration tower for CO2 desorption and regeneration. However, the phase separator in the related art relies on the density difference between the light phase and the heavy phase for separation, and it is often difficult to achieve efficient and complete separation under flow conditions. This causes part of the lean liquid to be carried into the regeneration tower, thereby increasing the heat energy consumption required in the CO2 desorption process and reducing the overall efficiency and energy consumption of the system. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, embodiments of the present invention provide a centrifugal phase separation device and a phase change carbon dioxide capture system.

[0004] The centrifugal phase separation device of an embodiment of the present invention includes a first pipe, a second pipe, a centrifugal cylinder, and an inner pipe. The first pipe and the second pipe are coaxially spaced and extend horizontally. The centrifugal cylinder is disposed between the first pipe and the second pipe, and its two ends are rotatably connected to the first pipe and the second pipe, respectively. The first pipe is used to communicate with the absorption tower to transport the rich liquid absorbent discharged from the absorption tower into the centrifugal cylinder. The centrifugal cylinder is used to centrifuge the rich liquid absorbent to centrifuge the rich liquid absorbent into a light phase absorbent and a heavy phase absorbent distributed in the radial direction of the centrifugal cylinder.

[0005] The inner tube is arranged in the second pipeline and is coaxially arranged with the second pipeline. An annular channel is defined between the inner tube and the second pipeline. The inner tube is used to transport the light phase absorbent centrifuged by the centrifuge cylinder to the absorption tower, and the annular channel is used to transport the heavy phase absorbent centrifuged by the centrifuge cylinder to the regeneration tower.

[0006] In some embodiments, the centrifugal phase separation device of the embodiment of the present invention includes a motor, a gear and a ring gear. The motor is arranged on one of the first pipe and the second pipe. A gear is sleeved on the output shaft of the motor. The ring gear is sleeved on the centrifugal cylinder and meshes with the gear.

[0007] In some embodiments, a first groove is formed on the outer wall of the first pipe, the first groove is arranged around the first pipe, and a first sealing ring is provided between the first groove and the inner wall of the centrifugal cylinder; and / or

[0008] A second groove is provided on the outer wall of the second pipe. The second groove surrounds the second pipe. A second sealing ring is provided between the second groove and the inner wall of the centrifugal cylinder.

[0009] In some embodiments, an inner cylinder is coaxially provided in the centrifugal cylinder, a plurality of spaced-apart through holes are provided on the inner cylinder, a fixed bracket is provided between the inner cylinder and the centrifugal cylinder, a heavy phase channel for conveying a heavy phase absorbent is defined between the inner cylinder and the centrifugal cylinder, the heavy phase channel is connected to the annular channel, and the inner cylinder is connected to the inner tube for conveying a light phase absorbent.

[0010] In some embodiments, the inner cylinder includes a first section and a second section arranged along its axial direction, the first section is disposed adjacent to the first pipe, and the through hole is disposed on the second section.

[0011] In some embodiments, the length of the first segment is L1, and the length of the second segment is L2, wherein 1 / 3≤L1 / L2≤2 / 3.

[0012] In some embodiments, the first section of the inner cylinder includes a first conical section and a first straight section, the first conical section is arranged adjacent to the first pipe, and the cross-sectional area of ​​the first conical section gradually decreases along the direction from the first pipe to the second pipe, wherein the inner diameter of the opening of the first conical section is larger than the inner diameter of the first pipe.

[0013] In some embodiments, the second section of the inner cylinder includes a second conical section and a second straight section, the second straight section is connected to the first straight section, the second conical section is arranged adjacent to the second pipe, the cross-sectional area of ​​the second conical section gradually increases from the first pipe to the second pipe, and one end of the inner tube is suitable for extending into the second conical section.

[0014] In some embodiments, the vias are provided on the second straight line segment and are arranged in an array on the second segment.

[0015] The phase-change carbon dioxide capture system of the embodiment of the present invention comprises an absorption tower, a regeneration tower and a centrifugal phase separation device, wherein the absorption tower has a lean liquid inlet and a rich liquid outlet, and the regeneration tower has a rich liquid inlet;

[0016] The centrifugal phase separation device is the centrifugal phase separation device described in any of the above embodiments, the first pipe is connected to the rich liquid outlet, the annular channel is connected to the rich liquid inlet, so as to transport the heavy phase absorbent separated by the centrifugal phase separation device to the regeneration tower, and the inner tube is connected to the lean liquid inlet to transport the light phase absorbent separated by the centrifugal phase separation device to the absorption tower.

[0017] The centrifugal phase-splitting device of the present invention can efficiently and completely separate the rich liquid absorbent in real time under flow conditions, and simultaneously transport the separated heavy and light phase absorbents to the regeneration and absorption towers, respectively. Compared with related technologies, the centrifugal phase-splitting device of the present invention can achieve efficient and complete separation of the rich liquid absorbent at higher flow rates, effectively preventing the carryover of lean liquid into the regeneration tower, thereby reducing the heat energy consumption required during the CO2 desorption process and improving the overall efficiency and energy consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a phase change carbon dioxide capture system according to an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of a centrifugal phase separation device according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 100. Centrifugal phase separation device; 200. Phase-change carbon dioxide capture system; 1. First pipeline; 101. First groove; 2. Second pipeline; 201. Second groove; 3. Centrifugal cylinder; 4. Absorption tower; 401. Lean liquid inlet; 402. Rich liquid outlet; 5. Inner tube; 6. Annular channel; 7. Regeneration tower; 701. Rich liquid inlet; 8. First sealing ring; 9. Second sealing ring; 10. Inner cylinder; 1001. Through hole; 1002. First section; 10021. First conical section; 10021. First straight section; 1003. Second section; 10031. Second conical section; 10032. Second straight section; 11. Fixed bracket; 12. Heavy phase channel. DETAILED DESCRIPTION

[0022] The 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.

[0023] like Figures 1 to 2As shown, a centrifugal phase separation device 100 according to an embodiment of the present invention includes a first pipe 1, a second pipe 2, a centrifugal drum 3, and an inner tube 5. The first pipe 1 and the second pipe 2 are coaxially spaced and extend horizontally. The centrifugal drum 3 is disposed between the first pipe 1 and the second pipe 2, with both ends rotatably connected to the first pipe 1 and the second pipe 2. The first pipe 1 is used to communicate with the absorption tower 4 to transport the rich liquid absorbent discharged from the absorption tower 4 into the centrifugal drum 3. The centrifugal drum 3 is used to centrifuge the rich liquid absorbent to separate the rich liquid absorbent into a light phase absorbent and a heavy phase absorbent distributed radially in the centrifugal drum 3.

[0024] The inner tube 5 is disposed within the second pipe 2 and is coaxially arranged with the second pipe 2. An annular channel 6 is defined between the inner tube 5 and the second pipe 2. The inner tube 5 is used to transport the light phase absorbent centrifuged by the centrifuge cylinder 3 to the absorption tower 4, and the annular channel 6 is used to transport the heavy phase absorbent centrifuged by the centrifuge cylinder 3 to the regeneration tower 7.

[0025] When the centrifugal phase separation device 100 of the embodiment of the present invention is in use, the rich liquid absorbent discharged from the absorption tower 4 is transported to the first pipe 1, and the rich liquid absorbent entering the first pipe 1 is transported to the centrifuge cylinder 3, and then the centrifuge cylinder 3 is rotated. Under the centrifugal action of the centrifuge cylinder 3, the rich liquid absorbent is centrifuged into heavy phase absorbent and light phase absorbent. Since the heavy phase absorbent is rich in CO2 and has a higher density, while the light phase absorbent contains less CO2 and has a lower density, the heavy phase absorbent is centrifuged to the outside of the light phase absorbent. After the centrifuge cylinder 3 completes the centrifugation of the rich liquid absorbent, the heavy phase absorbent is transported to the regeneration tower 7 through the annular channel 6 for heating, desorption and regeneration, while the light phase absorbent is transported back to the absorption tower 4 through the inner tube 5 to continue absorbing carbon dioxide in the flue gas.

[0026] The centrifugal phase separation device 100 of the embodiment of the present invention can efficiently and completely separate the rich liquid absorbent in real time under flow conditions, and can simultaneously transport the separated heavy phase absorbent and light phase absorbent to the regeneration tower 7 and absorption tower 4, respectively. Compared with the related art, the centrifugal phase separation device 100 of the embodiment of the present invention can achieve efficient and complete separation of the rich liquid absorbent at a higher flow rate, effectively preventing the carryover of lean liquid into the regeneration tower 7, thereby reducing the heat energy consumption required during the CO2 desorption process and improving the overall efficiency and energy consumption of the system.

[0027] In some embodiments, the centrifugal phase separation device 100 of the present invention includes a motor (not shown), a gear (not shown), and a ring gear (not shown). The motor is mounted on one of the first pipe 1 and the second pipe 2. The motor output shaft is provided with a gear, and the ring gear is mounted on the centrifugal cylinder 3 and meshes with the gear.

[0028] Specifically, the motor is the power source of the centrifugal phase separation device 100. It rotates to drive the gears. Because the ring gear is mounted on the centrifuge cylinder 3 and meshes with the gears, when the gears rotate, the ring gear rotates with it, thereby driving the centrifuge cylinder 3 to rotate. The centrifuge cylinder 3 rotates to centrifuge the rich liquid absorbent flowing through the centrifuge cylinder 3. The structure of the gears and ring gears can efficiently transmit the rotational power generated by the motor, ensuring that the centrifuge cylinder 3 can operate smoothly and efficiently. By adjusting the speed of the motor, the rotation speed of the centrifuge cylinder 3 can be adjusted to meet different process requirements.

[0029] In some embodiments, a first groove 101 is provided on the outer wall of the first pipe 1 . The first groove 101 surrounds the first pipe 1 . A first sealing ring 8 is provided between the first groove 101 and the inner wall of the centrifugal cylinder 3 .

[0030] First groove 101 surrounds first pipe 1, forming an additional sealing layer between first pipe 1 and centrifuge cylinder 3. A first sealing ring 8 is positioned between first groove 101 and the inner wall of centrifuge cylinder 3. This first sealing ring 8 forms a tight seal between centrifuge cylinder 3 and first pipe 1, preventing leakage of the rich liquid absorbent during high-speed rotation. First sealing ring 8 can be made of rubber, silicone, or other suitable materials to ensure a good sealing performance.

[0031] In some embodiments, a second groove 201 is formed on the outer wall of the second pipe 2 , and the second groove 201 surrounds the second pipe 2 . A second sealing ring 9 is provided between the second groove 201 and the inner wall of the centrifugal cylinder 3 .

[0032] Second groove 201 surrounds second pipe 2, forming an additional sealing layer between second pipe 2 and centrifuge cylinder 3. A second sealing ring 9 is positioned between second groove 201 and the inner wall of centrifuge cylinder 3. This second sealing ring 9 forms a tight seal between centrifuge cylinder 3 and second pipe 2, preventing leakage of the rich liquid absorbent during high-speed rotation. Second sealing ring 9 can be made of rubber, silicone, or other suitable materials to ensure a good sealing performance.

[0033] In some embodiments, an inner cylinder 10 is coaxially disposed within the centrifuge cylinder 3. The inner cylinder 10 is provided with a plurality of spaced-apart through-holes 1001. A fixing bracket 11 is disposed between the inner cylinder 10 and the centrifuge cylinder 3. A heavy phase channel 12 for conveying a heavy phase absorbent is defined between the inner cylinder 10 and the centrifuge cylinder 3. The heavy phase channel 12 communicates with the annular channel 6. The inner cylinder 10 communicates with the inner tube 5 for conveying a light phase absorbent.

[0034] The function of the inner cylinder 10 is to enhance the centrifugal separation effect. It is provided with a plurality of spaced-apart through-holes 1001. These through-holes 1001 allow the heavy phase absorbent to pass through under the action of centrifugation, thereby achieving separation. The setting of the through-holes 1001 is to allow the rich liquid absorbent to form effective fluid dynamic conditions inside the centrifugal cylinder 3 and promote the separation process. The spaced arrangement of the through-holes 1001 helps to form different velocity fields in the radial and axial directions of the centrifugal cylinder 3, thereby more effectively separating the heavy phase and the light phase. A fixed bracket 11 is provided between the inner cylinder 10 and the centrifugal cylinder 3, which helps to maintain the position of the inner cylinder 10 stable and prevent the inner cylinder 10 from shifting under the action of centrifugation. A heavy phase channel 12 for conveying the heavy phase absorbent is defined between the inner cylinder 10 and the centrifugal cylinder 3. The heavy phase channel 12 is connected to the annular channel 6, so that the heavy phase absorbent can be conveyed from the heavy phase channel 12 to the annular channel 6 and finally to the regeneration tower 7. The inner cylinder 10 is communicated with the inner tube 5 , and the light phase absorbent enters the inner tube 5 through the inner cylinder 10 , and is then transported back to the absorption tower 4 through the inner tube 5 .

[0035] In some embodiments, the inner cylinder 10 includes a first section 1002 and a second section 1003 arranged along its axial direction. The first section 1002 is disposed adjacent to the first pipe 1 , and the through hole 1001 is disposed on the second section 1003 .

[0036] Due to its proximity to the first pipeline 1, the first section 1002 can more effectively process the rich absorbent delivered from the absorption tower 4, initially separating the heavy and light phases. The vias 1001 provided in the second section 1003 allow the rich absorbent to be further centrifuged within the second section 1003, achieving a more thorough separation of the heavy and light phases. The arrangement of the vias 1001 maximizes the centrifugal separation effect while also taking into account fluid dynamics balance.

[0037] Optionally, the length of the first segment 1002 is L1, and the length of the second segment 1003 is L2, wherein 1 / 3≤L1 / L2≤2 / 3.

[0038] The inner cylinder 10 is close to the first section 1002 of the first pipeline 1, and its length is L1. The main function of the first section 1002 is to preliminarily separate the heavy phase and the light phase in the rich liquid absorbent under the action of centrifugal force. Since the first section 1002 is close to the absorption tower 4, it can process the rich liquid absorbent sent from the absorption tower 4 and separate the heavy phase and the light phase therein. The inner cylinder 10 is away from the second section 1003 of the first pipeline 1, and its length is L2. The through hole 1001 on the second section 1003 allows the rich liquid absorbent to be further subjected to centrifugal action, thereby achieving a more thorough separation. The function of the second section 1003 is to further separate the heavy phase and the light phase after the first section 1002 to ensure an efficient separation effect. The length ratio 1 / 3≤L1 / L2≤2 / 3, that is, the ratio between L1 and L2 should be between 1 / 3 and 2 / 3. This length ratio is to ensure that an effective velocity field and pressure field are formed in the centrifugal barrel 3, to ensure that the rich liquid absorbent is fully centrifuged in the first section 1002 and the second section 1003, and to avoid fluid dynamics problems caused by an inappropriate length ratio, thereby achieving more efficient separation.

[0039] In some embodiments, the first section 1002 of the inner cylinder 10 includes a first conical section 10021 and a first straight section 10021, the first conical section 10021 is arranged adjacent to the first pipe 1, and the cross-sectional area of ​​the first conical section 10021 gradually decreases along the direction from the first pipe 1 to the second pipe 2, wherein the inner diameter of the opening of the first conical section 10021 is larger than the inner diameter of the first pipe 1.

[0040] The first conical section 10021 is a section of the inner cylinder 10 close to the first pipe 1, and its cross-sectional area gradually decreases in the direction from the first pipe 1 to the second pipe 2. The inner diameter of the opening of the first conical section 10021 is larger than the inner diameter of the first pipe 1, so that all the rich liquid absorbent flowing in the first pipe 1 can enter the inner cylinder 10 and begin to undergo centrifugal action, thereby helping to quickly separate the heavy phase and the light phase.

[0041] In some embodiments, the second section 1003 of the inner cylinder 10 includes a second conical section 10031 and a second straight section 10032, the second straight section 10032 is connected to the first straight section 10021, the second conical section 10031 is arranged adjacent to the second pipe 2, and the cross-sectional area of ​​the second conical section gradually increases from the first pipe 1 to the second pipe 2, and one end of the inner tube 5 is suitable for extending into the second conical section 10031.

[0042] The second conical section 10031 is a section of the inner cylinder 10 close to the second pipe 2, and its cross-sectional area gradually increases along the direction from the first pipe 1 to the second pipe 2, and one end of the inner pipe 5 is suitable for extending into the second conical section 10031. This ensures that the light phase absorbent can directly enter the inner pipe 5 from the second conical section 10031, thereby realizing effective transportation of the light phase.

[0043] Optionally, the vias 1001 are provided on the second straight line segment 10032 and are arranged in an array on the second segment 1003 .

[0044] Through-holes 1001 are provided on second straight segment 10032 and arranged in an array. This arrangement allows the rich liquid absorbent to be centrifuged through through-holes 1001 as it passes through second straight segment 10032, thereby achieving further separation. The array arrangement of through-holes 1001 ensures a uniform centrifugal field is formed on the straight segment, facilitating more effective separation of the heavy and light phases.

[0045] The present invention also discloses a phase-change carbon dioxide capture system 200 comprising an absorption tower 4, a regeneration tower 7, and a centrifugal phase separation device 100. The absorption tower 4 has a lean liquid inlet 401 and a rich liquid outlet 402, with the rich liquid outlet 402 communicating with the first pipeline 1. The regeneration tower 7 has a rich liquid inlet 701. The centrifugal phase separation device 100 is the centrifugal phase separation device 100 described in any of the above embodiments. The annular channel 6 communicates with the rich liquid inlet 701 to transport the heavy phase absorbent separated by the centrifugal phase separation device 100 to the regeneration tower 7. The inner tube 5 communicates with the lean liquid inlet 401 to transport the light phase absorbent separated by the centrifugal phase separation device 100 to the absorption tower 4.

[0046] The saturated rich liquid absorbent in absorption tower 4 is transported through rich liquid outlet 402 to first pipeline 1 and then into centrifugal phase separation device 100. Centrifugal phase separation device 100 utilizes centrifugal force to separate the heavy and light phases in the rich liquid absorbent. The separated heavy phase absorbent is transported through annular channel 6 to regeneration tower 7 for further processing and regeneration. The separated light phase absorbent is transported through inner pipe 5 to absorption tower 4 for reuse.

[0047] Thus, the phase-change carbon dioxide capture system 200 of the embodiment of the present invention can efficiently and completely separate the rich liquid absorbent in real time under flow conditions, and can simultaneously transport the separated heavy-phase absorbent and light-phase absorbent to the regeneration tower 7 and absorption tower 4, respectively. Compared with related technologies, the phase-change carbon dioxide capture system 200 of the embodiment of the present invention can achieve efficient and complete separation of the rich liquid absorbent at higher flow rates, effectively preventing the carryover of lean liquid into the regeneration tower 7, thereby reducing the heat energy consumption required during the CO2 desorption process and improving the overall efficiency and energy consumption of the system.

[0048] In the description of the present invention, it should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0049] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0053] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A centrifugal phase separation device, characterized in that: include: a first pipe, a second pipe, and a centrifugal drum, wherein the first pipe and the second pipe are coaxially spaced and extend horizontally; the centrifugal drum is disposed between the first pipe and the second pipe, and both ends of the centrifugal drum are rotatably connected to the first pipe and the second pipe, respectively; the first pipe is used to communicate with the absorption tower to transport the rich liquid absorbent discharged from the absorption tower into the centrifugal drum; the centrifugal drum is used to centrifuge the rich liquid absorbent to centrifuge the rich liquid absorbent into a light phase absorbent and a heavy phase absorbent distributed in the radial direction of the centrifugal drum; an inner tube, the inner tube being disposed within the second tube and coaxially arranged with the second tube, an annular channel being defined between the inner tube and the second tube, the inner tube being used to transport the light phase absorbent centrifuged by the centrifuge cylinder to the absorption tower, and the annular channel being used to transport the heavy phase absorbent centrifuged by the centrifuge cylinder to the regeneration tower; An inner cylinder is coaxially provided in the centrifugal cylinder, and a plurality of through holes arranged at intervals are opened on the inner cylinder. A fixing bracket is provided between the inner cylinder and the centrifugal cylinder. A heavy phase channel for conveying a heavy phase absorbent is defined between the inner cylinder and the centrifugal cylinder. The heavy phase channel is communicated with the annular channel, and the inner cylinder is communicated with the inner tube for conveying a light phase absorbent. The inner cylinder comprises a first section and a second section arranged along its axial direction, the first section is arranged adjacent to the first pipe, and the through hole is provided on the second section; The length of the first segment is L1, the length of the second segment is L2, wherein 1 / 3≤L1 / L2≤2 / 3; The first section of the inner cylinder includes a first tapered section and a first straight section, wherein the first tapered section is disposed adjacent to the first pipe, and the cross-sectional area of ​​the first tapered section gradually decreases along the direction from the first pipe to the second pipe, wherein the inner diameter of the opening of the first tapered section is larger than the inner diameter of the first pipe; The second section of the inner cylinder includes a second tapered section and a second straight section, the second straight section is connected to the first straight section, the second tapered section is disposed adjacent to the second pipe, the cross-sectional area of ​​the second tapered section gradually increases along the direction from the first pipe to the second pipe, and one end of the inner pipe is adapted to extend into the second tapered section; The vias are provided on the second straight line segment and are arranged in an array on the second segment.

2. The centrifugal phase separation device according to claim 1, characterized in that The centrifugal device comprises a motor, a gear and a gear ring. The motor is arranged on one of the first pipe and the second pipe. The output shaft of the motor is sleeved with a gear. The gear ring is sleeved on the centrifugal cylinder and meshes with the gear.

3. The centrifugal phase separation device according to claim 1, characterized in that A first groove is formed on the outer wall of the first pipe, the first groove is arranged around the first pipe, and a first sealing ring is provided between the first groove and the inner wall of the centrifugal cylinder; and / or A second groove is provided on the outer wall of the second pipe. The second groove surrounds the second pipe. A second sealing ring is provided between the second groove and the inner wall of the centrifugal cylinder.

4. A phase change carbon dioxide capture system, characterized in that: include: An absorption tower and a regeneration tower, wherein the absorption tower has a lean liquid inlet and a rich liquid outlet, and the regeneration tower has a rich liquid inlet; A centrifugal phase separation device, wherein the centrifugal phase separation device is the centrifugal phase separation device according to any one of claims 1 to 3, wherein the first pipe is connected to the rich liquid outlet, the annular channel is connected to the rich liquid inlet, so as to transport the heavy phase absorbent separated by the centrifugal phase separation device to the regeneration tower, and the inner tube is connected to the lean liquid inlet to transport the light phase absorbent separated by the centrifugal phase separation device to the absorption tower.

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