Power-free automatic phase-splitting device and carbon dioxide trapping system with power-free automatic phase-splitting device

Abstract

The invention provides a reactive automatic phase splitting device and a carbon dioxide capture system with the same, and relates to the technical field of carbon dioxide capture. The wattless automatic phase-splitting device comprises a phase-splitting tank body and a phase-splitting component. A liquid inlet, a lean-phase liquid outlet and a rich-phase liquid outlet are formed in the split-phase tank body, and a lean-phase liquid outlet pipe and a connecting hose are arranged in the split-phase tank body. The density of the lean-phase liquid outlet pipe is the same as that of lean-phase liquid, and the density of the connecting hose is the same as that of rich-phase liquid. The split-phase part comprises a baffle located in the split-phase tank body, a plurality of holes are evenly formed in the baffle, and the baffle is connected with the inner wall of the split-phase tank body in an up-down sliding mode; the density of the baffle is between the lean phase and the rich phase. The wattless automatic phase splitting device can automatically adapt to the height change of a poor-rich phase interface, does not need external power input, is suitable for various solvent systems, and improves the overall energy efficiency and economical efficiency of a carbon capture system.

Description

Technical Field

[0001] The present invention relates to the field of carbon dioxide capture technology, in particular to a power-free automatic phase separation device and a carbon dioxide capture system having the same Background Art

[0002] In fields such as carbon dioxide capture, hydrometallurgy, and chemical separation, effective separation of two immiscible liquids (e.g., lean and rich phases) is often required. Traditional phase separation technologies suffer from the following main issues: 1. They rely on a fixed liquid level structure, which can lead to delayed liquid discharge when the liquid flow rate changes. 2. Power-based automatic technologies (such as electric liquid level monitoring) often require external power input, increasing overall energy consumption in continuous carbon capture systems and failing to meet low-carbonization process requirements. Therefore, it is necessary to design a power-free automatic phase separation device and a carbon dioxide capture system incorporating it to address these technical issues. Summary of the Invention

[0003] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a high-efficiency phase separation device that can automatically adapt to changes in the height of the rich-lean phase interface (changes in liquid flow rate and rich-lean phase ratio), does not require external power input, and is applicable to a variety of solvent systems, thereby improving the overall energy efficiency and economy of the carbon capture system.

[0004] To achieve the above object, the present invention provides a power-free automatic phase-splitting device, comprising: A phase separation tank body, wherein the phase separation tank body is provided with a liquid inlet, a lean phase liquid outlet, and a rich phase liquid outlet, wherein the rich phase liquid outlet is provided below the liquid inlet; a lean phase liquid outlet pipe and a connecting hose are provided within the phase separation tank body, wherein one end of the connecting hose is connected to the lean phase liquid outlet; the density of the lean phase liquid outlet pipe is the same as that of the lean phase liquid, and the density of the connecting hose is the same as that of the rich phase liquid; The phase separation component includes a baffle located in the phase separation tank body, the baffle being evenly provided with a plurality of holes, the baffle being slidably connected to the inner wall of the phase separation tank body up and down, the lean phase liquid outlet pipe being connected to the top of the baffle, the other end of the connecting hose being connected to the bottom of the baffle, and the lean phase liquid outlet pipe being in communication with the connecting hose; the density of the baffle being between the lean phase and the rich phase, and when the baffle is located at the lowest position in the phase separation tank body, the top end of the lean phase liquid outlet pipe is higher than the liquid inlet position.

[0005] Preferably, the baffle is made of polyoxymethylene or polytetrafluoroethylene.

[0006] Preferably, the lean phase liquid outlet pipe is a microporous PTFE composite pipe with modified PTFE as the matrix, and hollow glass microbeads are added to adjust the density to be the same as that of the lean phase liquid.

[0007] Preferably, the connecting hose is made of a fluororubber composite tube, and hollow glass microbeads are added to adjust the density to be the same as that of the rich phase liquid.

[0008] Preferably, a cylindrical cavity is provided in the phase separation tank, and the baffle is a circular plate.

[0009] Preferably, the inner wall of the phase separation tank is connected with symmetrically arranged slide rails, and the baffle is provided with a slider that matches the slide rails.

[0010] Preferably, both ends of the slide rail are provided with anti-slip structures for preventing the slider from escaping from the slide rail.

[0011] Preferably, the power-free automatic phase separation device also includes a lean phase pump and a lean phase valve. The lean phase pump is arranged outside the phase separation tank and on the pipeline connected to the lean phase liquid outlet, and is used to control the output flow rate of the lean phase liquid. The lean phase valve is connected to the lean phase pump and is used to assist in regulating the flow rate of the lean phase liquid outlet.

[0012] Preferably, the power-free automatic phase separation device also includes a rich phase pump and a rich phase valve. The rich phase pump is arranged on the pipeline connected to the rich phase liquid outlet and is used to control the output flow rate of the rich phase liquid. The rich phase valve is connected to the rich phase pump and is used to assist in regulating the flow rate of the rich phase liquid outlet.

[0013] The present invention further provides a carbon dioxide capture system, comprising any of the above-mentioned power-free automatic phase separation devices, and further comprising: An absorption tower, wherein the liquid outlet of the absorption tower is connected to the liquid inlet of the power-free automatic phase separation device, a regeneration tower, wherein the liquid inlet of the regeneration tower is connected to the rich phase liquid outlet of the power-free automatic phase separation device; A mixer, wherein the inlet of the mixer is respectively connected to the lean phase liquid outlet of the power-free automatic phase separation device and the liquid outlet of the regeneration tower, and the outlet of the mixer is connected to the liquid inlet of the absorption tower.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The power-free automatic phase separation device of the embodiment of the present invention can automatically adapt to the height change of the rich-poor phase interface without the need for external power input, is applicable to various solvent systems, and can improve the overall energy efficiency and economy of the carbon capture system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a power-free automatic phase-splitting device according to an embodiment of the present invention; Figure 2 Schematic diagram of a baffle in a power-free automatic phase-splitting device according to an embodiment of the present invention; Figure 3Schematic diagram of a carbon dioxide capture system according to an embodiment of the present invention.

[0016] Description of Reference Numerals 1-phase separation tank, 2-slide rail, 3-lean phase liquid outlet, 4-rich phase liquid outlet, 5-liquid inlet, 6-baffle, 7-lean phase liquid level, 8-rich phase liquid level, 9-lean phase valve, 10-lean phase pump, 11-rich phase valve, 12-rich phase pump, 13-lean phase liquid outlet pipe, 14-connecting piece, 15-connecting hose; 100-powerless automatic phase separation device, 200-absorption tower, 201-absorption tower liquid outlet, 202-absorption tower liquid inlet; 300-regeneration tower, 301-regeneration tower liquid outlet, 302-regeneration tower liquid inlet; 400-mixer. DETAILED DESCRIPTION

[0017] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0018] In the description of the present invention, it should be understood that the terms "above", "below", "height", "higher than", "top", "bottom", "up", "down", etc. indicating orientations or positional relationships are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0019] In the description of the present invention, "lean phase" and "rich phase" refer to two liquid phase layers with different densities formed by the carbon dioxide absorbent solution during the phase separation process. The "lean phase" refers to the liquid phase layer with a smaller carbon dioxide load and a lower density, and the "rich phase" refers to the liquid phase layer with a higher carbon dioxide load and a higher density.

[0020] In the present invention, unless otherwise expressly specified or limited, terms such as "fixed," "connected," "connected," "configured," and "matched" should be understood in a broad sense. For example, "connected" may refer to a fixed connection or a detachable connection, a direct connection or an indirect connection via an intermediate medium, and may refer to internal communication between two elements or interaction between two elements, unless otherwise expressly specified or limited. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through a medium. Furthermore, a first feature being "above" a second feature 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. A first feature being "below" a second feature 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.

[0022] In the present invention, the terms "some embodiments," "this embodiment," or "particularly" refer to specific features, structures, materials, or characteristics of the embodiment as being included in at least one embodiment of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0023] like Figures 1 to 3 As shown, this embodiment provides a power-free automatic phase-splitting device, comprising a phase-splitting tank 1 and phase-splitting components. The phase-splitting tank 1 is provided with a liquid inlet 5, a lean-phase liquid outlet 3, and a rich-phase liquid outlet 4, with the rich-phase liquid outlet 4 located below the liquid inlet 5. A lean-phase liquid outlet pipe 13 and a connecting hose 15 are provided within the phase-splitting tank 1, one end of which is connected to the lean-phase liquid outlet 3. The lean-phase liquid outlet pipe 13 has the same density as the lean-phase liquid, while the connecting hose 15 has the same density as the rich-phase liquid. The phase separation component includes a baffle 6 located in the phase separation tank body 1, and the baffle 6 is evenly provided with multiple holes. The baffle 6 is slidably connected to the inner wall of the phase separation tank body 1 up and down, and the lean phase liquid outlet pipe 13 is connected to the top of the baffle 6. The other end of the connecting hose 15 is connected to the bottom of the baffle 6, and the lean phase liquid outlet pipe 13 is connected to the connecting hose 15; the density of the baffle 6 is between the lean phase and the rich phase. When the baffle 6 is located at the lowest position in the phase separation tank body 1, the top of the lean phase liquid outlet pipe 13 is higher than the position of the liquid inlet 5.

[0024] Specifically, the middle part of the phase separation tank body 1 adopts a cylindrical structure, and the two ends are partially spherical. The material can be 316L stainless steel. A cylindrical cavity is provided in the phase separation tank body 1, and the baffle 6 is correspondingly set as a circular plate. The inner wall of the phase separation tank body 1 is connected to a symmetrically arranged slide rail 2, and the baffle 6 is provided with a slider that cooperates with the slide rail 2, so that the baffle 6 can move up and down in the phase separation tank body 1. The slide rail 2 can be polished to reduce friction resistance and ensure that the baffle 6 can be lifted and lowered smoothly. A connecting piece 14 is provided in the middle of the circular baffle 6, and the lower end of the lean phase liquid outlet pipe 13 is connected to the connecting piece 14. One end of the connecting hose 15 is connected to the lean phase liquid outlet 3, and the other end is connected to the connecting piece 14, and is connected to the lean phase liquid outlet pipe 13. The connecting hose 15 can be deformed to adapt to the height position change of the baffle 6.

[0025] Baffle 6 is equipped with evenly distributed holes, which facilitate the penetration of the lean and rich phases through baffle 6 and distribute them above and below it during the phase separation process, thereby achieving interfacial separation. Baffle 6 separates the solution into a lean phase with a lower density and a rich phase with a higher density. Its density lies between the lean and rich phases, allowing it to remain stably suspended at the interface between the two liquid layers. After phase separation, a lean phase level 7 and a rich phase level 8 are formed, with the height of rich phase level 8 corresponding to the position of baffle 6. For example, a mixed solution of MEA and DEEA undergoes phase separation in the power-free automatic phase-splitting device of this embodiment. Baffle 6 is made of polyoxymethylene (density 1.03 g / cm³). The denser MEA (density 1.05 g / cm³) passes through the holes and sinks below baffle 6 to form a rich phase, while the less dense DEEA (density 1.02 g / cm³) passes through the holes and floats above baffle 6 to form a lean phase. The carbon dioxide loading in the rich and lean phase layers differs, forming a lean phase level 7 and a rich phase level 8. Because 1.02 < 1.03 < 1.05, baffle 6 remains at the interface between the two phases, and the height of the rich phase level 8 is the same as the height of baffle 6. When the solution level in the phase-splitting tank 1 changes, baffle 6 adaptively moves up and down along the slide rail 2 based on the change in buoyancy, thereby maintaining dynamic equilibrium at the phase-separation interface.

[0026] The power-free automatic phase separation device provided in this embodiment can automatically adapt to the height change of the rich-poor phase interface without the need for external power input, is applicable to various solvent systems, and improves the overall energy efficiency and economy of the carbon capture system.

[0027] In this embodiment, the holes on the baffle 6 can effectively balance the fluid dynamic pressure and buoyancy by precisely designing the aperture, number and distribution position, inhibit the baffle 6 from unexpected upward movement, significantly reduce the turbulence intensity, form a stable laminar flow state, and improve the phase separation efficiency.

[0028] In some optional embodiments, the baffle 6 is made of polyoxymethylene or polytetrafluoroethylene.

[0029] In some optional embodiments, the lean phase liquid outlet pipe 13 is a microporous PTFE composite tube with modified PTFE as the matrix, and hollow glass microbeads are added to adjust the density to be the same as that of the lean phase liquid.

[0030] In some optional embodiments, the connecting hose 15 is made of a fluororubber composite tube, and hollow glass microbeads are added to adjust the density to be the same as that of the rich phase liquid.

[0031] In some optional embodiments, anti-slip structures are provided at both ends of the slide rail 2 to prevent the slider from detaching from the slide rail 2, thereby preventing the baffle 6 from detaching from the slide rail 2 under extreme working conditions.

[0032] In some optional embodiments, the power-free automatic phase-splitting device further includes a lean phase pump 10 and a lean phase valve 9. The lean phase pump 10 is disposed outside the phase-splitting tank 1 and in a pipeline connected to the lean phase liquid outlet 3, and is used to control the output flow rate of the lean phase liquid. The lean phase valve 9 is in communication with the lean phase pump 10 and is used to assist in regulating the flow rate at the lean phase liquid outlet 3. The lean phase pump 10 and the lean phase valve 9 are located in the pipeline connected to the lean phase liquid outlet 3 after phase separation is completed, and are only used for liquid transmission control in subsequent processes, and do not affect the power-free characteristics within the phase-splitting device.

[0033] In some optional embodiments, the power-free automatic phase-splitting device further includes a rich-phase pump 12 and a rich-phase valve 11. The rich-phase pump 12 is disposed in a pipeline connected to the rich-phase liquid outlet 4 and is used to control the output flow rate of the rich-phase liquid. The rich-phase valve 11 is in communication with the rich-phase pump 12 and is used to assist in regulating the flow rate of the rich-phase liquid outlet 4. The rich-phase pump 12 and the rich-phase valve 11 are located in the pipeline connected to the rich-phase liquid outlet 4 after phase separation is completed and are only used for liquid transmission control in subsequent processes and do not affect the power-free characteristics within the phase-splitting device.

[0034] This embodiment further provides a carbon dioxide capture system, comprising any of the above-mentioned power-free automatic phase separation devices 100, and further comprising: The absorption tower 200, wherein the absorption tower liquid outlet 201 is connected to the liquid inlet 5 of the powerless automatic phase separation device 100, The regeneration tower 300, wherein the regeneration tower liquid inlet 302 is connected to the rich phase liquid outlet 4 of the power-free automatic phase separation device; The mixer 400 has an inlet connected to the lean phase liquid outlet 3 of the power-free automatic phase separation device 100 and the regeneration tower liquid outlet 301 , and an outlet connected to the absorption tower liquid inlet 202 .

[0035] Specifically, the power-free automatic phase-splitting device 100 is located between the absorption tower 200 and the regeneration tower 300. The power-free automatic phase-splitting device 100 separates the rich liquid before entering the regeneration tower 300 into a carbon dioxide-rich phase layer and a carbon dioxide-lean phase layer, thereby redistributing and further enriching carbon dioxide in the rich liquid. The carbon dioxide-rich phase layer is sent to the regeneration tower 300 for desorption, reducing the amount of solution entering the regeneration tower 300, reducing regeneration energy consumption, and reducing the operating cost of the carbon dioxide capture system. The inlet of the mixer 400 is connected to the lean phase outlet 3 of the power-free automatic phase-splitting device 100 and the regeneration tower outlet 301 to mix the solution in the carbon dioxide-lean phase layer with the desorbed lean liquid, and then transfer the mixed solution to the absorption tower 200. This embodiment reduces the amount of solution entering the regeneration tower by separating the rich liquid and transferring the rich phase solution to the regeneration tower for regeneration. The lean liquid desorbed from the regeneration tower is then mixed with the lean phase liquid and transferred to the absorption tower, thereby improving the mixing uniformity of the solution.

[0036] It is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A power-free automatic phase-splitting device, characterized in that: include: A phase separation tank (1) is provided with a liquid inlet (5), a lean phase liquid outlet (3) and a rich phase liquid outlet (4), and the rich phase liquid outlet (4) is provided below the liquid inlet (5); a lean phase liquid outlet pipe (13) and a connecting hose (15) are provided in the phase separation tank (1), and one end of the connecting hose (15) is connected to the lean phase liquid outlet (3); the density of the lean phase liquid outlet pipe (13) is the same as that of the lean phase liquid, and the density of the connecting hose (15) is the same as that of the rich phase liquid; The phase separation component includes a baffle (6) located in the phase separation tank (1), the baffle (6) is evenly provided with a plurality of holes, the baffle (6) is slidably connected to the inner wall of the phase separation tank (1) up and down, the lean phase liquid outlet pipe (13) is connected to the top of the baffle (6), the other end of the connecting hose (15) is connected to the bottom of the baffle (6), and the lean phase liquid outlet pipe (13) is connected to the connecting hose (15); the density of the baffle (6) is between the lean phase liquid and the rich phase liquid, and when the baffle (6) is located at the lowest position in the phase separation tank (1), the top end of the lean phase liquid outlet pipe (13) is higher than the position of the liquid inlet (5).

2. The power-free automatic phase-splitting device according to claim 1, characterized in that: The baffle (6) is made of polyoxymethylene or polytetrafluoroethylene.

3. The power-free automatic phase-splitting device according to claim 1, characterized in that: The lean phase liquid outlet pipe (13) is a microporous PTFE composite pipe with modified PTFE as the matrix, and hollow glass microbeads are added to adjust the density to be the same as that of the lean phase liquid.

4. The power-free automatic phase-splitting device according to claim 1, characterized in that: The connecting hose (15) is made of a fluororubber composite tube, and hollow glass microbeads are added to adjust the density to be the same as that of the rich phase liquid.

5. The power-free automatic phase-splitting device according to claim 1, characterized in that: A cylindrical cavity is provided in the phase separation tank (1), and the baffle (6) is a circular plate.

6. The power-free automatic phase-splitting device according to claim 5, characterized in that: The inner wall of the phase separation tank (1) is connected to a symmetrically arranged slide rail (2), and the baffle (6) is provided with a slider that matches the slide rail (2).

7. The power-free automatic phase-splitting device according to claim 6, characterized in that: Anti-slip structures for preventing the slider from escaping from the slide rail (2) are provided at both ends of the slide rail (2).

8. The power-free automatic phase-splitting device according to claim 1, characterized in that: The power-free automatic phase separation device further comprises a lean phase pump (10) and a lean phase valve (9). The lean phase pump (10) is arranged outside the phase separation tank (1) and on a pipeline connected to the lean phase liquid outlet (3), and is used to control the output flow rate of the lean phase liquid. The lean phase valve (9) is connected to the lean phase pump (10), and the lean phase valve (9) is used to assist in regulating the flow rate of the lean phase liquid outlet (3).

9. The power-free automatic phase-splitting device according to claim 1, characterized in that: The power-free automatic phase separation device also includes a rich phase pump (12) and a rich phase valve (11). The rich phase pump (12) is arranged on the pipeline connected to the rich phase liquid outlet (4) and is used to control the output flow rate of the rich phase liquid. The rich phase valve (11) is connected to the rich phase pump (12) and is used to assist in regulating the flow rate of the rich phase liquid outlet (4).

10. A carbon dioxide capture system, characterized in that: The power-free automatic phase-splitting device (100) according to any one of claims 1 to 9 further comprises: An absorption tower (200), wherein the absorption tower liquid outlet (201) is connected to the liquid inlet (5) of the power-free automatic phase separation device (100); A regeneration tower (300), wherein the regeneration tower liquid inlet (302) is connected to the rich phase liquid outlet (4) of the power-free automatic phase separation device (100); A mixer (400), wherein the inlet of the mixer (400) is respectively connected to the lean phase liquid outlet (3) of the power-free automatic phase separation device (100) and the regeneration tower liquid outlet (301), and the outlet of the mixer (400) is connected to the absorption tower liquid inlet (202).

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