A power-free automatic phase-splitting device and a carbon dioxide capture system having the same

Abstract

The application provides a kind of reactive power automatic phase separation device and carbon dioxide capture system with it, it is related to carbon dioxide capture technical field.The reactive power automatic phase separation device includes phase separation tank body and phase separation component.Liquid inlet, lean phase liquid outlet and rich phase liquid outlet are provided on the phase separation tank body, and lean phase liquid outlet pipe and connecting hose are provided in the phase separation tank body.The density of lean phase liquid outlet pipe is the same as that of lean phase liquid, and the density of connecting hose is the same as that of rich phase liquid.The phase separation component includes baffle in the phase separation tank body, the baffle is uniformly provided with a plurality of holes, and the baffle is slidably connected with the inner wall of the phase separation tank body;The density of baffle is between lean phase and rich phase.The reactive power automatic phase separation device of the application can automatically adapt to the height change of lean and rich phase interface, does not need external power input, is suitable for a variety of solvent systems, improves the overall energy efficiency and economy of carbon capture system.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide capture technology, specifically a powerless automatic phase-separation device and a carbon dioxide capture system having the same. Background Technology

[0002] In fields such as carbon dioxide capture, hydrometallurgy, and chemical separation, it is often necessary to effectively separate two immiscible liquids (such as lean and rich phases). Traditional phase separation technologies mainly suffer from the following problems: 1. They rely on fixed liquid level structures, leading to delayed discharge when liquid flow changes. 2. Power-automated 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 the requirements of low-carbon processes. Therefore, it is necessary to design a powerless automatic phase separation device and a carbon dioxide capture system incorporating it to solve the above-mentioned technical problems. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a highly efficient phase separation device that can automatically adapt to changes in the height of the interface between the rich and poor phases (changes in liquid flow rate and the ratio of rich and poor phases), requires no external power input, and is applicable to a variety of solvent systems, so as to improve the overall energy efficiency and economy of carbon capture systems.

[0004] To achieve the above objectives, the present invention provides a power-free automatic phase-splitting device, comprising:

[0005] The phase-separating tank is provided with an inlet, a lean phase outlet, and a rich phase outlet, with the rich phase outlet located below the inlet. The phase-separating tank is provided with a lean phase outlet pipe and a connecting hose, one end of which is connected to the lean phase outlet. The density of the lean phase 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.

[0006] The phase separation component includes a baffle located inside the phase separation tank. The baffle is uniformly provided with multiple holes and is slidably connected to the inner wall of the phase separation tank. A lean phase outlet pipe is connected to the top of the baffle, and the other end of a connecting hose is connected to the bottom of the baffle. The lean phase outlet pipe communicates with the connecting hose. The density of the baffle is between that of the lean phase and the rich phase. When the baffle is located at the lowest position inside the phase separation tank, the top of the lean phase outlet pipe is higher than the inlet position.

[0007] Preferably, the baffle is made of polyoxymethylene or polytetrafluoroethylene.

[0008] Preferably, the lean phase outlet pipe is a microporous PTFE composite pipe, with modified PTFE as the matrix and hollow glass microspheres added to adjust the density to be the same as that of the lean phase liquid.

[0009] Preferably, the connecting hose is made of fluororubber composite tubing, and hollow glass microspheres are added to adjust the density to be the same as that of the rich phase liquid.

[0010] Preferably, the phase separation tank has a cylindrical cavity inside, and the baffle is a circular plate.

[0011] Preferably, the inner wall of the phase separation tank is connected to symmetrically arranged slide rails, and the baffle is provided with a slider that cooperates with the slide rails.

[0012] Preferably, the slide rail is provided with anti-detachment structures at both ends to prevent the slider from detaching from the slide rail.

[0013] Preferably, the powerless automatic phase separation device further includes a lean phase pump and a lean phase valve. The lean phase pump is located outside the phase separation tank and on the pipeline connected to the lean phase 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 adjusting the flow rate of the lean phase outlet.

[0014] Preferably, the powerless automatic phase separation device further includes a rich phase pump and a rich phase valve. The rich phase pump is located on the pipeline connected to the rich phase 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 adjusting the flow rate of the rich phase outlet.

[0015] The present invention also provides a carbon dioxide capture system, comprising the powerless automatic phase separation device described in any of the above claims, and further comprising:

[0016] The absorber tower, wherein the outlet of the absorber tower is connected to the inlet of the powerless automatic phase separation device.

[0017] A regeneration tower, wherein the inlet of the regeneration tower is connected to the rich phase outlet of the powerless automatic phase separation device;

[0018] The mixer has its inlet connected to the lean phase outlet of the powerless automatic phase separation device and the outlet of the regeneration tower, and its outlet connected to the inlet of the absorption tower.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The powerless automatic phase separation device of this invention can automatically adapt to changes in the height of the interface between the rich and poor phases, requires no external power input, is suitable for various solvent systems, and can improve the overall energy efficiency and economy of carbon capture systems. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the powerless automatic phase-splitting device according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the baffle in the powerless automatic phase-splitting device according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a carbon dioxide capture system according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures

[0025] 1-Separation tank, 2-Slide rail, 3-Lean phase outlet, 4-Rich phase outlet, 5-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 outlet pipe, 14-Connector, 15-Connecting hose;

[0026] 100 - Automatic phase separation device without power; 200 - Absorption tower; 201 - Absorption tower outlet; 202 - Absorption tower inlet; 300 - Regeneration tower; 301 - Regeneration tower outlet; 302 - Regeneration tower inlet; 400 - Mixer. Detailed Implementation

[0027] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0028] In the description of this invention, it should be understood that the terms "above", "below", "height", "higher than", "top", "bottom", "up", "down", etc., which indicate orientation or positional relationship based on the drawings, are only for the convenience of describing this invention and simplifying the description, and do not imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0029] In the description of this invention, "lean phase" and "rich phase" refer to two liquid phase layers of different densities formed by the carbon dioxide absorbent solution during the phase separation process. "Lean phase" refers to a liquid phase layer with a lower carbon dioxide loading and a lower density, while "rich phase" refers to a liquid phase layer with a higher carbon dioxide loading and a higher density.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "fixed," "connected," "connected," "set," and "fitting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection or a detachable connection, a direct connection or an indirect connection through an intermediate medium, and refers to the internal communication between two elements or the interaction between two elements, 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.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean direct contact between the first and second features, or indirect contact between the first and second features through a medium. Furthermore, "above" the second feature can mean 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" the second feature can mean directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In this invention, the terms "some embodiments," "this embodiment," or "specific" refer to specific features, structures, materials, or characteristics associated with that embodiment, which are included in at least one embodiment of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in one or more embodiments.

[0033] like Figures 1 to 3 As shown, this embodiment provides a powerless automatic phase separation device, including a phase separation tank 1 and a phase separation component. The phase separation tank 1 is provided with an inlet 5, a lean phase outlet 3, and a rich phase outlet 4, with the rich phase outlet 4 located below the inlet 5. The phase separation tank 1 contains a lean phase outlet pipe 13 and a connecting hose 15, one end of which is connected to the lean phase outlet 3. The density of the lean phase 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 inside the phase separation tank 1. The baffle 6 is uniformly provided with multiple holes. The baffle 6 is slidably connected to the inner wall of the phase separation tank 1. The lean phase 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. The lean phase outlet pipe 13 is connected to the connecting hose 15. The density of the baffle 6 is between that of the lean phase and the rich phase. When the baffle 6 is located at the lowest position inside the phase separation tank 1, the top of the lean phase outlet pipe 13 is higher than the position of the inlet 5.

[0034] Specifically, the phase-separating tank 1 has a cylindrical structure in the middle and partially spherical ends. It can be made of 316L stainless steel. The phase-separating tank 1 has a cylindrical cavity inside, and the baffle 6 is correspondingly set as a circular plate. Symmetrically arranged slide rails 2 are connected to the inner wall of the phase-separating tank 1. The baffle 6 has a slider that cooperates with the slide rails 2, allowing the baffle 6 to move up and down within the phase-separating tank 1. The slide rails 2 can be polished to reduce frictional resistance and ensure smooth lifting and lowering of the baffle 6. A connector 14 is located in the middle of the circular baffle 6. The lower end of the lean phase outlet pipe 13 is connected to the connector 14. One end of the connecting hose 15 is connected to the lean phase outlet 3, and the other end is connected to the connector 14 and communicates with the lean phase outlet pipe 13. The connecting hose 15 can deform to adapt to changes in the height of the baffle 6.

[0035] The baffle 6 has uniformly distributed holes to facilitate the penetration of the lean and rich phases during phase separation, allowing them to distribute on its upper and lower sides, thus achieving interfacial separation. The baffle 6 separates the solution into a less dense lean phase and a more dense rich phase; its density falls between the two, allowing it to remain stably suspended at the interface between the two liquid layers. After phase separation, a lean phase surface 7 and a rich phase surface 8 are formed, with the height of the rich phase surface 8 being the position height of the baffle 6. For example, in this embodiment, a mixed solution of MEA and DEEA undergoes phase separation in a powerless automatic phase separation device. 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, forming a rich phase. The less dense DEEA (density 1.02 g / cm³) passes through the holes and floats above baffle 6, forming a lean phase. The different carbon dioxide loadings in the rich and lean phase layers create a lean phase surface 7 and a rich phase surface 8. Since 1.02 < 1.03 < 1.05, baffle 6 remains at the two-phase interface, and the height of the rich phase surface 8 is the height of baffle 6. When the solution level in the phase separation tank 1 changes, baffle 6 adaptively moves up and down along the slide rail 2 according to the change in buoyancy, thereby maintaining dynamic equilibrium at the phase separation interface.

[0036] The powerless automatic phase separation device provided in this embodiment can automatically adapt to changes in the height of the interface between the rich and poor phases, requires no external power input, is suitable for various solvent systems, and improves the overall energy efficiency and economy of the carbon capture system.

[0037] In this embodiment, the holes on the baffle 6 are precisely designed in terms of diameter, number and distribution, which can effectively balance the effects of fluid dynamic pressure and buoyancy, suppress the unexpected upward movement of the baffle 6, significantly reduce the turbulence intensity, form a stable laminar flow state, and improve the phase separation efficiency.

[0038] In some alternative embodiments, the baffle 6 is made of polyoxymethylene or polytetrafluoroethylene.

[0039] In some optional embodiments, the lean phase outlet pipe 13 is a microporous PTFE composite pipe with modified PTFE as the matrix and hollow glass microspheres added to adjust the density to be the same as that of the lean phase liquid.

[0040] In some optional embodiments, the connecting hose 15 is made of fluororubber composite tubing, and hollow glass microspheres are added to adjust the density to be the same as that of the rich phase liquid.

[0041] In some optional embodiments, the slide rail 2 is provided with anti-detachment structures at both ends to prevent the slider from detaching from the slide rail 2, and to prevent the baffle 6 from detaching from the slide rail 2 under extreme working conditions.

[0042] In some optional embodiments, the powerless automatic phase separation device further includes a lean phase pump 10 and a lean phase valve 9. The lean phase pump 10 is located outside the phase separation tank 1 and on the pipeline connected to the lean phase 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 is used to assist in regulating the flow rate of the lean phase outlet 3. The lean phase pump 10 and the lean phase valve 9 are located on the pipeline connected to the lean phase outlet 3 after phase separation, and are only used for liquid transfer control in subsequent processes, without affecting the powerless characteristics of the phase separation device.

[0043] In some optional embodiments, the powerless automatic phase separation device further includes a rich phase pump 12 and a rich phase valve 11. The rich phase pump 12 is located on the pipeline connected to the rich phase 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 outlet 4. The rich phase pump 12 and the rich phase valve 11 are located on the pipeline connected to the rich phase outlet 4 after phase separation and are only used for liquid transfer control in subsequent processes, without affecting the powerless characteristics of the phase separation device.

[0044] This embodiment also provides a carbon dioxide capture system, including the powerless automatic phase-separating device 100 described in any of the above embodiments, and further comprising:

[0045] The absorption tower 200 has its outlet 201 connected to the inlet 5 of the powerless automatic phase separation device 100.

[0046] The regeneration tower 300 has its inlet 302 connected to the rich phase outlet 4 of the powerless automatic phase separation device.

[0047] The mixer 400 has an inlet connected to the lean phase outlet 3 of the powerless automatic phase separation device 100 and the outlet 301 of the regeneration tower, and an outlet connected to the inlet 202 of the absorption tower.

[0048] Specifically, the powerless automatic phase separation device 100 is located between the absorption tower 200 and the regeneration tower 300. This device separates the rich liquid before it enters the regeneration tower 300 into a carbon dioxide-rich phase layer and a carbon dioxide-lean phase layer, achieving redistribution and further enrichment of carbon dioxide in the rich liquid. The carbon dioxide-rich phase layer is then sent to the regeneration tower 300 for desorption, reducing the amount of solution entering the regeneration tower 300, lowering 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 powerless automatic phase separation device 100 and the regeneration tower outlet 301 to mix the carbon dioxide-lean phase layer solution with the desorbed lean liquid. After mixing, the mixture is transported to the absorption tower 200. In this embodiment, by separating the rich liquid and transporting the rich phase solution to the regeneration tower for regeneration, the amount of solution entering the regeneration tower is reduced. Then, the lean liquid after desorption in the regeneration tower is mixed with the lean phase liquid before being transported to the absorption tower, improving the mixing uniformity of the solution.

[0049] 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 power-free automatic phase-splitting device, characterized in that, include: A phase separation tank (1) is provided with an inlet (5), a lean phase outlet (3), and a rich phase outlet (4), with the rich phase outlet (4) located below the inlet (5). The phase separation tank (1) is provided with a lean phase outlet pipe (13) and a connecting hose (15), with one end of the connecting hose (15) connected to the lean phase outlet (3). The density of the lean phase 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 inside the phase separation tank (1). The baffle (6) is uniformly provided with multiple holes. The baffle (6) is slidably connected to the inner wall of the phase separation tank (1). The lean phase 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). The lean phase outlet pipe (13) is connected to the connecting hose (15). The density of the baffle (6) is between that of the lean phase liquid and the rich phase liquid. When the baffle (6) is located at the lowest position inside the phase separation tank (1), the top of the lean phase outlet pipe (13) is higher than the position of the inlet (5). The inner wall of the phase separation tank (1) is connected to symmetrically arranged slide rails (2), and the baffle (6) is provided with a slider that cooperates with the slide rails (2).

2. The automatic phase-splitting device without power according to claim 1, characterized in that: The baffle (6) is made of polyoxymethylene or polytetrafluoroethylene.

3. The automatic phase-splitting device without power according to claim 1, characterized in that: The lean phase outlet pipe (13) is a microporous PTFE composite pipe with modified PTFE as the matrix and hollow glass microspheres added to adjust the density to be the same as that of the lean phase liquid.

4. The automatic phase-splitting device without power according to claim 1, characterized in that: The connecting hose (15) is made of fluororubber composite tube, and hollow glass microspheres are added to adjust the density to be the same as that of the rich phase liquid.

5. The automatic phase-splitting device without power according to claim 1, characterized in that: The phase separation tank (1) has a cylindrical cavity inside, and the baffle (6) is a circular plate.

6. The automatic phase-splitting device without power according to claim 1, characterized in that: The slide rail (2) has anti-detachment structures at both ends to prevent the slider from detaching from the slide rail (2).

7. The automatic phase-splitting device without power according to claim 1, characterized in that: The powerless automatic phase separation device also includes a lean phase pump (10) and a lean phase valve (9). The lean phase pump (10) is located outside the phase separation tank (1) and on the pipeline connected to the lean phase outlet (3) 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 is used to assist in adjusting the flow rate of the lean phase outlet (3).

8. The automatic phase-splitting device without power according to claim 1, characterized in that: The powerless automatic phase separation device also includes a rich phase pump (12) and a rich phase valve (11). The rich phase pump (12) is located on the pipeline connected to the rich phase 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 adjusting the flow rate of the rich phase outlet (4).

9. A carbon dioxide capture system, characterized in that, Including the power-free automatic phase-splitting device (100) according to any one of claims 1 to 8, further comprising: The absorber (200) has its outlet (201) connected to the inlet (5) of the powerless automatic phase separation device (100); The regeneration tower (300) has its inlet (302) connected to the rich phase outlet (4) of the powerless automatic phase separation device (100); The mixer (400) has an inlet connected to the lean phase outlet (3) of the powerless automatic phase separation device (100) and the outlet (301) of the regeneration tower, respectively, and an outlet connected to the inlet (202) of the absorption tower.

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