Phase splitting device and application thereof in phase splitting treatment of carbon capture two-phase absorbent

Abstract

The invention discloses a phase splitting device and application thereof in phase splitting treatment of a carbon capture two-phase absorbent. The phase splitting device comprises a shell, an inlet, a lower phase outlet and an upper phase outlet, a pre-split-phase chamber, a split-phase chamber and a separation chamber which are communicated in sequence are arranged in the shell; the pre-phase-splitting chamber comprises a swirler and a rectifying plate; the split-phase chamber comprises a split-phase reinforcing plate and a rotary fixing frame; a hydrophilic material, a hydrophobic material or a combination thereof is arranged on the surface of the split-phase reinforcing plate; and the included angle between the split-phase reinforcing plate and the horizontal plane is 30-75 degrees. By arranging the pre-phase-splitting chamber, the phase-splitting chamber and the separation chamber, a phase-splitting liquid can achieve a good pre-separation effect in the pre-phase-splitting chamber and stably enters the phase-splitting chamber, and then efficient and rapid phase splitting is achieved through treatment of a specific phase-splitting reinforcing plate in the phase-splitting chamber; and the device has the advantages of small volume, compact structure, low investment cost and the like, and particularly has important significance on stable operation of the carbon capture two-phase absorbent.

Description

Technical Field

[0001] The present invention belongs to the technical field of phase separation, and particularly relates to a phase separation device and its application in the phase separation treatment of a two-phase absorbent for carbon capture. Background Art

[0002] Major industrial sources of carbon emissions such as coal-fired power plants, steel plants, and cement plants can achieve large-scale carbon dioxide emissions reduction through carbon capture technology. Among many carbon capture technologies, chemical absorption carbon capture is the most mature in technology and has the broadest application prospects. After years of development, the third-generation two-phase absorbent has significant advantages in energy conservation and cost reduction, and has received extensive attention in the industry. Currently, it has entered the industrial demonstration stage.

[0003] After the two-phase absorbent absorbs CO2, phase separation will occur, forming a water phase rich in CO2 and an organic phase almost free of CO2. Only the water phase rich in CO2 needs to be desorbed to achieve CO2 capture, which can significantly reduce the energy consumption of desorption. The ability of the two-phase absorbent to achieve phase separation is essentially due to the excessive difference in solution polarity between the CO2-rich phase and the CO2-poor phase. The upper and lower phase separation process is mainly driven by gravity due to the density difference. The rapid phase separation of the two-phase absorbent is crucial for the smooth operation of the entire carbon capture system. The rapid phase separation of the absorbent is the basis for continuously extracting the CO2-rich phase for low-energy consumption desorption to generate CO2. To ensure the smooth phase separation of CO2, a phase separator is usually used to provide a suitable flow space and residence time to achieve the phase separation of CO2.

[0004] A dual-separation chamber phase separator is disclosed in the prior art, which can achieve the simultaneous or sequential operation of the dual-separation chambers to ensure the formation of a continuous and stable cyclic phase separation. Another prior art discloses a low-disturbance phase separator, which can reduce the solution disturbance in the inner cavity through the separation of the separation chamber and the arrangement of the guide plates, facilitating the gradual stratification of the solution in the inner cavity and improving the separation effect of the rich phase and the poor phase.

[0005] The above-mentioned prior arts all achieve the phase separation of the two-phase absorbent by providing more space and residence time, which results in a larger volume and higher cost of the phase separator. In addition, since the phase separation behavior of the two-phase absorbent after absorbing CO2 is affected by various factors, including absorption load, viscosity, temperature, etc., it is also required that the phase separator can achieve high-performance phase separation under complex working condition changes, which is difficult to achieve in the prior art. Summary of the Invention

[0006] In order to overcome at least one of the problems of large volume, high cost, and poor adaptability to load fluctuations of the phase separator in the above-mentioned prior art, one of the purposes of the present invention is to provide a phase separation device that can achieve rapid phase separation and has the advantages of small volume, compact structure, and low investment cost.

[0007] A second object of the present invention is to provide an application of the above-mentioned phase separation device in the phase separation treatment of a two-phase absorbent for carbon capture.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A first aspect of the present invention provides a phase separation device, including a housing, an inlet, a lower phase outlet, and an upper phase outlet; a pre-phase separation chamber, a phase separation chamber, and a separation chamber are sequentially communicated inside the housing; the inlet is communicated with the pre-phase separation chamber; both the lower phase outlet and the upper phase outlet are communicated with the separation chamber;

[0010] The pre-phase separation chamber includes a cyclone and a rectifying plate; the cyclone is arranged between the inlet and the rectifying plate;

[0011] The phase separation chamber includes a phase separation strengthening plate and a rotating fixing frame; the rotating fixing frame is connected to the housing for fixing and adjusting the phase separation strengthening plate; the surface of the phase separation strengthening plate is provided with a hydrophilic material, a hydrophobic material, or a combination thereof; the included angle between the phase separation strengthening plate and the horizontal plane is 30 to 75°.

[0012] The phase separation device of the present invention divides the interior of the housing into three chambers: a pre-phase separation chamber, a phase separation chamber, and a separation chamber. The phase separation liquid enters the phase separation device from the inlet. First, the cyclone in the pre-phase separation chamber is used to pre-separate the phase separation liquid, and then it is smoothly processed through the rectifying plate to avoid the disturbance of the liquid flowing out of the cyclone due to the relatively fast flow rate, resulting in the mixing of the pre-separated liquids. In addition, the space separated by the rectifying plate can also enable the liquid to further separate through laminar flow; then, the phase separation strengthening plate in the phase separation chamber is used. The hydrophilic material and / or hydrophobic material on its surface can promote the attachment and aggregation of the aqueous phase and the organic phase of the liquid on the surface, accelerating the separation of the aqueous phase and the organic phase. In addition, by adjusting the included angle between the phase separation strengthening plate and the horizontal plane, the distance of the liquid droplet contacting the hydrophilic material and / or hydrophobic material in the vertical direction in the flow channel can be changed. Generally, the smaller the included angle, the shorter the vertical contact distance, and the better the separation effect in the single flow channel. However, considering the collection of the liquid flow channels in the subsequent process, the smaller the inclination angle, the worse the overall collection effect of the subsequent aqueous phase and organic phase. Therefore, the included angle is controlled at 30 to 75°; finally, the liquid enters the separation chamber, and the lower phase and the upper phase flow out through the lower phase outlet and the upper phase outlet respectively to complete the phase separation.

[0013] In some specific embodiments of the present invention, the rectifying plate is distributed with diversion holes.

[0014] The diversion holes are arranged on the rectifying plate, so that the liquid flowing out of the cyclone can pass through the diversion holes, providing a vertical settling space for the further phase separation of the phase separation liquid, enabling the heavy phase in the upper liquid after pre-separation by the cyclone to enter the lower liquid through the diversion holes, and promoting phase separation.

[0015] In some specific embodiments of the present invention, the rectifying plate includes a horizontal rectifying plate and a vertical rectifying plate. In some specific embodiments of the present invention, diversion holes are distributed on both the horizontal rectifying plate and the vertical rectifying plate.

[0016] The combined setting of the horizontal rectifying plate and the vertical rectifying plate is conducive to the smooth flow of the liquid. Combined with the setting of the diversion holes, it can effectively promote phase separation.

[0017] In the present invention, the aperture and distribution of the diversion holes can be set according to the actual properties of the phase-separated liquid and actual needs, and the present invention does not make specific limitations; preferably, small diversion holes are used.

[0018] In some specific embodiments of the present invention, the number of the cyclones is one or more; when the number of the cyclones is more than one, a shunt pipe is further provided between the inlet and the multiple cyclones. More specifically, the multiple cyclones are in parallel.

[0019] The number of the cyclones can also be set according to the actual properties of the phase-separated liquid and actual needs. Setting multiple cyclones can process more phase-separated liquid at the same time and can also achieve a better pre-separation effect.

[0020] In some specific embodiments of the present invention, the cyclone includes a tangential centrifugal cyclone, an axial guide vane cyclone or a combination thereof.

[0021] The tangential centrifugal cyclone forms a swirling flow by tangential feeding to produce the effect of swirling centrifugal separation, so that the light and heavy phases in the phase-separated liquid are separated; the axial guide vane cyclone forms a swirling flow by the guide vanes to produce the effect of swirling centrifugal separation, so that the light and heavy phases in the phase-separated liquid are separated.

[0022] In some specific embodiments of the present invention, the cyclone includes a feed inlet, a light phase outlet and a heavy phase outlet; the feed inlet is communicated with the inlet; the light phase outlet is communicated with the upper part of the pre-phase separation chamber; the heavy phase outlet is communicated with the lower part of the pre-phase separation chamber.

[0023] The cyclone is used to pre-separate the phase-separated liquid. The pre-separated light phase liquid can enter the upper part of the rectifying plate through the light phase outlet, and through the diversion holes distributed on the rectifying plate, part of the heavy phase contained in the pre-separated light phase liquid can enter the lower part of the rectifying plate through the diversion holes, so that more heavy phase is collected in the lower part of the rectifying plate and more light phase is collected in the upper part of the rectifying plate, obtaining a better pre-separation effect.

[0024] In some specific embodiments of the present invention, the phase separation strengthening plate is a multi-layer structure; the spacing between each layer of the phase separation strengthening plate is 5-30 mm; for example, it can be any value among 5 mm, 10 mm, 15 mm, 20 mm, 25 mm or 30 mm or the range value between any two of them.

[0025] In some specific embodiments of the present invention, the rotary fixing frame is connected to the housing through a positioning flange.

[0026] The installation position of the phase separation strengthening plate can be adjusted through the rotary fixing frame, so that the angle between the phase separation strengthening plate and the horizontal plane can be conveniently and efficiently adjusted, thus meeting the needs of different phase separation liquids, especially meeting the phase separation operation needs of two-phase absorbents with different properties and loads.

[0027] In some specific embodiments of the present invention, the angle between the phase separation strengthening plate and the horizontal plane can be any value among 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° or 75° or the range value between any two of them.

[0028] In some specific embodiments of the present invention, the phase separation strengthening plate is a corrugated plate or a flat plate; preferably a corrugated plate. The corrugated flow channel of the corrugated plate has a larger contact space with the phase separation liquid, which is beneficial to promoting the phase separation process.

[0029] In some specific embodiments of the present invention, the axial direction of the corrugation of the corrugated plate is parallel to the flow direction of the fluid.

[0030] In some specific embodiments of the present invention, the angle between the corrugated flow channel of the corrugated plate and the horizontal plane is 5-30°; for example, it can be any value among 5°, 10°, 15°, 20°, 25° or 30° or the range value between any two of them.

[0031] In some specific embodiments of the present invention, the surface of the phase separation strengthening plate is provided with a combination of hydrophilic material and hydrophobic material; specifically, one side of the phase separation strengthening plate is provided with hydrophilic material, and the other side is provided with hydrophobic material.

[0032] By providing a phase separation strengthening plate with one hydrophilic side and one hydrophobic side, the separation of the water phase and the organic phase in the liquid can be better promoted, and a better phase separation effect can be obtained.

[0033] In some specific embodiments of the present invention, the hydrophobic material is selected from polypropylene materials.

[0034] In some specific embodiments of the present invention, the hydrophilic material is selected from maleic anhydride modified materials.

[0035] In some specific embodiments of the present invention, the separation chamber further includes an overflow plate, a flow disturbance prevention plate, or a combination thereof; the overflow plate is located near the upper phase outlet; the flow disturbance prevention plate is located near the lower phase outlet.

[0036] The setting of the flow disturbance prevention baffle can reduce the disturbance to the nearby liquid when the lower phase is discharged from the lower phase outlet. The setting of the overflow plate can enable the liquid in the separation chamber to be fully phase-separated, so that the upper phase flowing into the upper phase outlet has a higher cleanliness. The overflow plate and the flow disturbance prevention plate can be set according to actual needs, and either one of them can be set alone, or both can be set.

[0037] In some specific embodiments of the present invention, the lower phase outlet and the upper phase outlet can both communicate with the lower part of the separation chamber, or both can communicate with the side of the separation chamber; alternatively, one can communicate with the lower part of the separation chamber, and the other can communicate with the side of the separation chamber.

[0038] In some specific embodiments of the present invention, the phase separation device further includes a phase separation measurement and monitoring hole, a sewage discharge port, or a combination thereof; the phase separation measurement and monitoring hole communicates with the separation chamber; the sewage discharge port communicates with the separation chamber; further, the phase separation measurement and monitoring hole can be located above the separation chamber; the sewage discharge port can be located below the separation chamber.

[0039] The phase separation measurement and monitoring hole can perform real-time measurement and monitoring of the phase separation situation in the separation chamber. The sewage discharge port can discharge the sewage in the separation chamber. The phase separation measurement and monitoring hole and the sewage discharge port can be set according to actual needs, and either one of them can be set alone, or both can be set.

[0040] In some specific embodiments of the present invention, the phase separation device can be arranged horizontally or vertically.

[0041] The second aspect of the present invention provides an application of the phase separation device according to the first aspect of the present invention in the phase separation treatment of carbon capture two-phase absorbents.

[0042] In some specific embodiments of the present invention, the composition of the carbon capture two-phase absorbent includes an amine compound, an alcohol compound, and water; in some more specific embodiments of the present invention, the composition of the carbon capture two-phase absorbent includes ethanolamine, n-butanol, and water.

[0043] The beneficial effects of the present invention are as follows: By setting up a pre-phase separation chamber, a phase separation chamber, and a separation chamber, the phase separation liquid can achieve a good pre-separation effect in the pre-phase separation chamber and smoothly enter the phase separation chamber. Then, through the treatment of specific phase separation strengthening plates in the phase separation chamber, efficient and rapid phase separation is achieved. Moreover, this device has the advantages of small volume, compact structure, low investment cost, and good adaptability to load fluctuations. In particular, it is of great significance for the stable operation of the carbon capture two-phase absorbent and the reduction of the cost of the entire carbon capture system. Description of the Drawings

[0044] Figure 1 It is a schematic structural diagram of the phase separation device of Example 1.

[0045] Figure 2 It is a schematic structural diagram of the cyclone and the rectifying plate of Example 1.

[0046] Figure 3 It is a schematic structural diagram of the phase separation strengthening plate and the rotating fixing frame of Example 1.

[0047] Figure 4 It is a schematic structural diagram of the phase separation device of Example 8.

[0048] Description of the reference numerals: 1. Housing; 11. Inlet; 12. Lower phase outlet; 13. Upper phase outlet; 14. Phase separation measurement and monitoring hole; 15. Drainage port; 2. Pre-phase separation chamber; 21. Cyclone; 211. Feed port; 212. Light phase outlet; 213. Heavy phase outlet; 22. Rectifying plate; 23. Shunt pipe; 3. Phase separation chamber; 31. Phase separation strengthening plate; 32. Rotating fixing frame; 4. Separation chamber; 41. Overflow plate; 42. Anti-turbulence baffle; 43. Phase separation interface; 44. Upper phase; 45. Lower phase. Detailed Description of the Embodiments

[0049] The following further details the content of the present invention through specific embodiments. It should be understood that the following embodiments are only used to further illustrate the present invention and cannot be construed as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the principles described in the present invention fall within the protection scope of the present invention. The specific process parameters and the like in the following examples are also only an example within a suitable range, that is, those skilled in the art can make selections within a suitable range according to the description in this article, rather than being limited to the specific data in the following examples. The raw materials, reagents, or devices used in the following examples and comparative examples can be obtained from conventional commercial channels or can be obtained by existing known methods without special instructions.

[0050] Example 1

[0051] A phase separation device, which can be used for the phase separation treatment of carbon capture two-phase absorbent, and the schematic structural diagram is as Figure 1As shown in the figure, the device includes a housing 1, an inlet 11, a lower-phase outlet 12, an upper-phase outlet 13, a phase separation measurement and monitoring hole 14, and a sewage outlet 15. Inside the housing 1, there are a pre-phase separation chamber 2, a phase separation chamber 3, and a separation chamber 4 that are connected in sequence. The inlet 11 is connected to the pre-phase separation chamber 2. Both the lower-phase outlet 12 and the upper-phase outlet 13 are connected to the separation chamber 4. The phase separation measurement and monitoring hole 14 is located above the separation chamber 4 and is connected to the separation chamber 4. The sewage outlet 15 is located below the separation chamber 4 and is connected to the separation chamber 4.

[0052] The pre-phase separation chamber 2 includes a hydrocyclone 21 and a rectifying plate 22. The hydrocyclone 21 is arranged between the inlet 11 and the rectifying plate 22. The hydrocyclone 21 includes a light-phase outlet 212 and a heavy-phase outlet 213. The light-phase outlet 212 is connected to the upper part of the pre-phase separation chamber 2. The heavy-phase outlet 223 is connected to the lower part of the pre-phase separation chamber 2. Figure 2 As shown in the structural schematic diagram of the hydrocyclone 21 and the rectifying plate 22 in this example, multiple hydrocyclones 21 in parallel are provided in the device of this example, and a shunt pipe 23 is also provided between the inlet 11 and the multiple hydrocyclones 21. Each hydrocyclone 21 includes a feed inlet 211, a light-phase outlet 212, and a heavy-phase outlet 213. The rectifying plate 22 is a combination of a horizontal rectifying plate and a vertical rectifying plate, which divides the pre-phase separation chamber 2 into several spaces. There are diversion small holes distributed on both the horizontal rectifying plate and the vertical rectifying plate, and the diversion small holes are not shown in the figure.

[0053] The phase separation chamber 3 includes a phase separation strengthening plate 31 and a rotating fixing frame 32. The rotating fixing frame 32 is connected to the housing 1 through a positioning flange, and the rotating fixing frame 32 is used to fix and adjust the phase separation strengthening plate 31. Figure 3 As shown in the structural schematic diagram of the phase separation strengthening plate 31 and the rotating fixing frame 32 in this example, where (a) is the left view and (b) is the main view. Figure 3 In the figure, α refers to the angle between the phase separation strengthening plate 31 and the horizontal plane; β refers to the angle between the corrugated flow channel of the phase separation strengthening plate 31 and the horizontal plane. The phase separation strengthening plate 31 is a multi-layer structure, and the distance between each layer of the phase separation strengthening plate is 10 mm. The phase separation strengthening plate 31 is in the form of a corrugated plate, and the axial direction of the corrugations of the corrugated plate 31 is parallel to the fluid flow direction. The corrugated flow channel forms an angle β of 15° with the horizontal plane. The upper and lower surfaces of the phase separation strengthening plate 31 are respectively provided with a hydrophobic material (specifically a polypropylene material) and a hydrophilic material (specifically a maleic anhydride modified material). The phase separation strengthening plate 31 is fixed on the rotating fixing frame 32, and the rotating fixing frame 32 is connected to the housing 1 of the phase separator through a positioning flange. The rotating fixing frame 32 can adjust the installation position to make the phase separation strengthening plate 31 form an angle α with the horizontal plane at a certain angle, and the angle α is 45°.

[0054] The separation chamber 4 includes an overflow plate 41 and a flow disturbance prevention baffle 42; the overflow plate 41 is a straight plate type, located near the upper phase outlet 13, and is in contact with the upper phase 44, the lower phase 45 and the phase separation interface 43. When the liquid in the separation chamber 4 is sufficient, the upper phase 44 can overflow over the overflow plate 41 and come into contact with the upper phase outlet 13; the flow disturbance prevention baffle 42 is located near the lower phase outlet 12, and the flow disturbance prevention baffle 42 can reduce the flow disturbance of the extracted lower phase on the nearby lower-layer organic phase.

[0055] Using the above phase separation device to perform phase separation treatment on the carbon capture two-phase absorbent, the specific process is as follows:

[0056] By volume percentage, the composition of the two-phase absorbent is: 30% MAE, 40% n-butanol and 30% water. The two-phase absorbent that has absorbed CO2 is fed into the phase separation device from the inlet 11. The absorbent passes through the shunt pipe 23 and enters three tangential centrifugal cyclones 21 arranged in parallel respectively. After pre-separation by the cyclone 21, the light phase of the absorbent enters the upper part of the pre-phase separation chamber 2 through the light phase outlet 212, and the heavy phase of the absorbent enters the lower part of the pre-phase separation chamber 2 through the heavy phase outlet 213. The pre-phase separation chamber 2 is provided with a rectifying plate 22, and the rectifying plate 22 is divided into a horizontal rectifying plate and a vertical rectifying plate, so that the liquids at the two outlets of the cyclone 21 can flow smoothly in the pre-phase separation chamber 2. The horizontal rectifying plate and the vertical rectifying plate are distributed with diversion holes, so that the solution in the pre-phase separation chamber 2 can pass through the diversion holes, providing a vertical sedimentation space for further phase separation of the absorbent. After pre-phase separation in the pre-phase separation chamber 2, the formed semi-light phase and semi-heavy phase solutions enter the phase separation chamber 3. The phase separation chamber 3 is provided with a phase separation enhancement plate 31, and the semi-light phase and semi-heavy phase solutions are further phase-separated by the phase separation enhancement plate 31. Then the liquid enters the separation chamber 4. In the separation chamber 4, mainly the absorbent that has basically completed phase separation is separated. The separation chamber 4 is provided with a flow disturbance prevention baffle 42 and an overflow plate 41. Among them, the flow disturbance prevention baffle 42 is to reduce the flow disturbance of the extracted lower phase on the nearby lower-layer organic phase. In addition, the lower phase outlet 12, the upper phase outlet 13, the phase separation measurement and monitoring hole 14 and the sewage outlet 15 are communicated with the separation chamber 4, and the lower phase outlet 12 and the upper phase outlet 13 are both below the separation chamber 4.

[0057] Example 2

[0058] A phase separation device, which is different from that in Example 1 in that the rectifying plate 22 (including the horizontal rectifying plate and the vertical rectifying plate) in this example is not provided with diversion holes. Other structures are the same as those in Example 1. And according to the method in Example 1, perform phase separation treatment on the carbon capture two-phase absorbent.

[0059] Comparative Example 1

[0060] A phase separation device, which is different from that in Embodiment 1 in that the rectifying plate 22 is not provided in the pre-phase separation chamber 2 in this example. Other structures are the same as those in Embodiment 1. And according to the method in Embodiment 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0061] The phase separation ratios and phase separation effects of Embodiments 1 to 2 and Comparative Example 1 are tested and calculated, and the calculation formulas are as follows:

[0062] Phase separation ratio = volume of CO2-rich phase / volume of two-phase absorbent × 100%;

[0063] Phase separation effect = actual phase separation ratio / ideal phase separation ratio × 100%;

[0064] The actual phase separation ratio refers to the phase separation ratio of the two-phase absorbent under actual conditions; the ideal phase separation ratio refers to the phase separation ratio of the two-phase absorbent under sufficient time and space.

[0065] The results are shown in Table 1.

[0066] Table 1 Phase separation ratios and phase separation effects of Embodiments 1 to 2 and Comparative Example 1

[0067] Rectifying plate setting Phase separation ratio Phase separation effect Example 1 Rectifying plate is set, and there are diversion small holes at the same time 46％ 100％ Example 2 Rectifying plate is set, but there are no diversion small holes 45％ 97％ Comparative example 1 Rectifying plate is not set 41％ 89％

[0068] As can be seen from Table 1, compared with Comparative Example 1, the phase separators with rectifying plates in Embodiments 1 to 2 can effectively improve the phase separation effect. Specifically, the rectifying plate can smoothly process the liquid flowing out of the cyclone, avoiding the disturbance of the liquid flowing out of the cyclone due to the relatively fast flow rate, resulting in the mixing of the pre-separated liquids. In addition, the space separated by the rectifying plate can also enable the liquid to be further phase-separated through laminar flow. And compared with Embodiment 2, Embodiment 1 is provided with diversion small holes on the rectifying plate, which can further improve the phase separation effect.

[0069] Embodiment 3

[0070] A phase separation device, which is different from that in Embodiment 1 in that both the upper and lower surfaces of the phase separation strengthening plate 31 in this example are made of hydrophobic materials (specifically polypropylene materials). Other structures are the same as those in Embodiment 1. And according to the method in Embodiment 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0071] Embodiment 4

[0072] A phase separation device, which is different from that in Embodiment 1 in that both the upper and lower surfaces of the phase separation strengthening plate 31 in this example are made of hydrophilic materials (specifically maleic anhydride modified materials). Other structures are the same as those in Embodiment 1. And according to the method in Embodiment 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0073] Comparative Example 2

[0074] A phase separation device, which is different from that of Example 1 in that no hydrophobic material or hydrophilic material is provided on the surface of the phase separation reinforcement plate 31 in this example. Other structures are the same as those of Example 1. And according to the method in Example 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0075] Comparative Example 3

[0076] A phase separation device, which is different from that of Example 1 in that the phase separation reinforcement plate 31 is not provided in the phase separation chamber 3 in this example. Other structures are the same as those of Example 1. And according to the method in Example 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0077] The phase separation ratios and phase separation effects of Examples 1, 3-4 and Comparative Examples 2-3 are tested and calculated, and the calculation formula is as follows:

[0078] Phase separation ratio = volume of CO2-rich phase / volume of two-phase absorbent × 100%;

[0079] Phase separation effect = actual phase separation ratio / ideal phase separation ratio × 100%;

[0080] The actual phase separation ratio refers to the phase separation ratio of the two-phase absorbent under actual conditions; the ideal phase separation ratio refers to the phase separation ratio of the two-phase absorbent under sufficient time and space.

[0081] The results are shown in Table 2.

[0082] Table 2 Phase separation ratios and phase separation effects of Examples 1, 3-4 and Comparative Examples 2-3

[0083] Phase separation strengthening plate setting Phase separation ratio Phase separation effect Example 1 Hydrophobic material and hydrophilic material are set on the phase separation strengthening plate 46％ 100％ Example 3 Only hydrophobic material is set on the phase separation strengthening plate 35％ 76％ Example 4 Only hydrophilic material is set on the phase separation strengthening plate 33％ 72％ Comparative example 2 Neither hydrophobic material nor hydrophilic material is set on the phase separation strengthening plate 29％ 63％ Comparative example 3 Phase separation strengthening plate is not set 22％ 48％

[0084] As can be seen from Table 2, compared with Comparative Example 3 without a phase separation reinforcement plate or Comparative Example 2 without a phase separation reinforcement plate with hydrophobic and hydrophilic materials, Examples 1 and 3-4 have better phase separation effects by setting hydrophobic materials and / or hydrophilic materials, and among them, Example 1 with both hydrophobic and hydrophilic materials set has a better phase separation effect.

[0085] Example 5

[0086] A phase separation device, which is different from that of Example 1 in that the angle α between the phase separation reinforcement plate 31 and the horizontal plane in this example is 75°. Other structures are the same as those of Example 1. And according to the method in Example 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0087] Example 6

[0088] A phase separation device, which is different from that of Example 1 in that the angle α between the phase separation reinforcement plate 31 and the horizontal plane in this example is 60°. Other structures are the same as those of Example 1. And according to the method in Example 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0089] Example 7

[0090] A phase separation device, different from that of Example 1 in that the included angle α between the phase separation strengthening plate 31 and the horizontal plane in this example is 30°. Other structures are the same as those of Example 1. And according to the method in Example 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0091] Comparative Example 4

[0092] A phase separation device, different from that of Example 1 in that the included angle α between the phase separation strengthening plate 31 and the horizontal plane in this example is 15°. Other structures are the same as those of Example 1. And according to the method in Example 1, the phase separation treatment of the carbon capture two-phase absorbent is carried out.

[0093] The phase separation ratios and phase separation effects of Examples 1, 5 to 7 and Comparative Example 4 are tested and calculated, and the calculation formula is as follows:

[0094] Phase separation ratio = volume of CO2-rich phase / volume of two-phase absorbent × 100%;

[0095] Phase separation effect = actual phase separation ratio / ideal phase separation ratio × 100%;

[0096] The actual phase separation ratio refers to the phase separation ratio of the two-phase absorbent under actual conditions; the ideal phase separation ratio refers to the phase separation ratio of the two-phase absorbent under sufficient time and space.

[0097] The results are shown in Table 3.

[0098] Table 3 Phase separation ratios and phase separation effects of Examples 1, 5 to 7 and Comparative Example 4

[0099] Angle α Phase separation ratio Phase separation effect Example 5 75° 33％ 72％ Example 6 60° 39％ 85％ Example 1 45° 46％ 100％ Example 7 30° 37％ 81％ Comparative example 4 15° 26％ 57％

[0100] As can be seen from Table 3, better phase separation effects can be obtained when the included angle α between the phase separation strengthening plate and the horizontal plane is between 30° and 75°, especially when the included angle α is about 45°, the phase separation effect is better.

[0101] Example 8

[0102] A phase separation device can be used for the phase separation treatment of the carbon capture two-phase absorbent. The structural schematic diagram is as Figure 4 shown. Different from that of Example 1, in this example, the lower phase outlet 12 and the upper phase outlet 13 are arranged on the side of the separation chamber 4; the overflow plate 41 is L-shaped, located near the upper phase outlet 13 and in contact with the upper phase 44; the anti-turbulence plate is not provided. Other structures are the same as those of Example 1. This phase separation device can carry out the phase separation treatment of the carbon capture two-phase absorbent according to the method in Example 1, and the phase separation effect is similar to that of Example 1.

[0103] In summary, by setting up a pre-phase separation chamber, a phase separation chamber and a separation chamber, the present invention enables the phase separation liquid to achieve a good pre-separation effect in the pre-phase separation chamber and smoothly enter the phase separation chamber. Furthermore, through the treatment of specific phase separation strengthening plates in the phase separation chamber, efficient and rapid phase separation is achieved. Moreover, this device has the advantages of small volume, compact structure, low investment cost, and good adaptability to load fluctuations. In particular, it is of great significance for the stable operation of the carbon capture two-phase absorbent and the reduction of the cost of the entire carbon capture system.

Claims

1. A phase separation device, characterized in that: It comprises a shell, an inlet, a lower phase outlet and an upper phase outlet; the interior of the shell is provided with a pre-phase separation chamber, a phase separation chamber and a separation chamber which are connected in sequence; the inlet is connected with the pre-phase separation chamber; The lower phase outlet and the upper phase outlet are both communicated with the separation chamber; The pre-phase separation chamber includes a cyclone and a rectifying plate; the cyclone is arranged between the inlet and the rectifying plate; the phase separation chamber includes a phase separation reinforcing plate and a rotating fixed frame; the rotating fixed frame is connected to the shell and is used to fix and adjust the phase separation reinforcing plate; the surface of the phase separation reinforcing plate is provided with a hydrophilic material, a hydrophobic material or a combination thereof; The angle between the phase separation strengthening plate and the horizontal plane is 30-75°.

2. The phase separation device according to claim 1, characterized in that: The rectifier plate is provided with flow guide holes; And / or, the rectifier plate includes a horizontal rectifier plate and a vertical rectifier plate.

3. The phase separation device according to claim 1, characterized in that: The number of the cyclones is one or more; when the number of the cyclones is multiple, a diverter pipe is further provided between the inlet and the multiple cyclones.

4. The phase separation device according to claim 1, characterized in that: The cyclone comprises a feed inlet, a light phase outlet and a heavy phase outlet; the feed inlet is connected to the inlet; the light phase outlet is connected to the upper part of the pre-phase separation chamber; the heavy phase outlet is connected to the lower part of the pre-phase separation chamber.

5. The phase separation device according to claim 1, characterized in that: The phase separation strengthening plate is a multi-layer structure; the spacing between each layer of the phase separation strengthening plate is 5 to 30 mm.

6. The phase separation device according to claim 1, characterized in that: The phase separation strengthening plate is a corrugated plate or a flat plate.

7. The phase separation device according to claim 6, characterized in that: The corrugation axis direction of the corrugated plate is parallel to the flow direction of the fluid; And / or, the angle between the corrugated flow channel of the corrugated plate and the horizontal plane is 5 to 30 degrees.

8. The phase separation device according to claim 1, characterized in that: The hydrophobic material is selected from polypropylene material; And / or, the hydrophilic material is selected from maleic anhydride modified materials.

9. The phase separation device according to claim 1, characterized in that: The separation chamber also includes an overflow plate, a spoiler plate or a combination thereof; the overflow plate is located near the upper phase outlet; the spoiler plate is located near the lower phase outlet; and / or the phase separation device also includes a phase separation measurement monitoring hole, a sewage outlet or a combination thereof; the phase separation measurement monitoring hole is connected to the separation chamber; the sewage outlet is connected to the separation chamber.

10. Use of the phase separation device according to any one of claims 1 to 9 in the phase separation treatment of a two-phase absorbent for carbon capture.

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