Alcohol amine-CO2 mixed gas-liquid two-phase separator

Abstract

The invention relates to an alkylol amine-CO2 mixed gas-liquid two-phase separator, which is internally provided with a plurality of innovative designs, such as a multi-umbrella-plate separator, a cooling separation device and a disturbance enhancing baffle plate, and can efficiently realize gas-liquid separation. Compared with a traditional pre-cooling treatment mode, the corrugated plates are creatively adopted as the cooler fins, and the cooling effect is achieved while separation is conducted. The pre-cooling treatment process is omitted, so that the whole separation system is more compact, the occupied area is smaller, and meanwhile, the installation and maintenance cost is also reduced. In addition, by means of multiple times of separation, gas outlet purity is guaranteed, the gas-liquid separation efficiency and the liquid recovery rate are improved, and the method is particularly suitable for separation of an alcohol amine solvent and carbon dioxide after carbon capture through a chemical absorption method.

Description

Technical Field

[0001] The present invention belongs to the technical field of separators, and particularly provides an amine-CO2 gas-liquid two-phase separator. Background Art

[0002] At present, there is a problem of absorption liquid loss in the carbon capture and separation technology based on chemical absorption method, which affects the carbon capture efficiency. It is necessary to cool the gas stream through a condenser before post-treatment to reduce the gas stream temperature and the carbon dioxide dissolution rate in the solution. This treatment method can enhance the recovery of the absorption liquid, but the additional installation of a condenser will increase the cost and floor space, and it is difficult to ensure the low-temperature environment during the post-treatment separation process.

[0003] The present invention is an amine-CO2 gas-liquid two-phase separator, which is internally provided with a number of innovative designs, such as a multi-stage umbrella plate separator, a cooling and separation device, and a disturbance enhancement baffle, etc., which can efficiently achieve gas-liquid separation. Compared with the traditional pre-cooling treatment method, the present invention innovatively uses corrugated plates as the cooler fins to achieve a cooling effect while separating. The pre-cooling treatment process is omitted, making the entire separation system more compact, with a smaller floor area, and at the same time reducing the installation and maintenance costs. In addition, the present invention also ensures the purity of the outlet gas through multiple separations, improves the gas-liquid separation efficiency and the liquid recovery rate, and is particularly suitable for the separation of solvents and carbon dioxide after carbon capture by chemical absorption method. Summary of the Invention

[0004] The gas-liquid separator with the alkanolamine solution as the working medium includes a shell 1, a gas-liquid inlet pipe 2, a drain pipe 3, an exhaust pipe 4, an upper umbrella plate separator 5, a middle umbrella plate separator 6, a lower umbrella plate separator 7, a baffle 8, a cooling and separation device 9, and a skirt support 10; the shell 1 includes a cylinder body 101, an upper head 102, a lower head 103, a circular opening 1011 at the lower part of the cylinder body, a circular opening a 1012 at the upper part of the cylinder body, a circular opening b 1013 at the upper part of the cylinder body, a circular opening 1021 on the upper head, and a circular opening 1031 on the lower head; the upper umbrella plate separator 5 includes an upper umbrella cap 501, an upper umbrella plate through hole 502, and an upper bottom ring plate 503; the middle umbrella plate separator 6 includes a middle umbrella cap 601, a middle umbrella plate through hole 602, a middle bottom ring plate 603, and an umbrella plate side hole 604; the lower umbrella plate separator 7 includes a lower umbrella cap 701 and a lower bottom ring plate 702; the cooling and separation device 9 includes a condensate outlet 901, a condensate inlet 902, a condensate pipe 903, a separation box 904, and a corrugated plate separator 905; the separation box 904 includes a bottom circular plate 9041, a cubic cavity 9042, a separation box side hole 9043, and a separation box through hole 9044; the corrugated plate separator 905 includes corrugated plates 9051 and corrugated plate through holes 9052; the central axes of the upper umbrella plate separator 5 and the middle umbrella plate separator 6 coincide with each other, and the shape is conical; an upper umbrella plate through hole 502 is opened at the top of the upper umbrella plate separator 5, and it is welded to the inner side of the shell 1 through the upper bottom ring plate 503; a middle umbrella plate through hole 602 is opened at the top of the middle umbrella plate separator 6, and umbrella plate side holes 604 are opened on the side. One group is set every 45°, and there are 8 groups in total. Each group is equidistantly arranged in three along the generatrix direction, and it is welded to the inner side of the shell 1 through the middle bottom ring plate 603; the baffle 8 is welded to the inner side of the shell 1 above the gas-liquid inlet pipe 2, and the vertical height of the baffle 8 is greater than the diameter of the gas-liquid inlet pipe 2; the central axes of the lower umbrella plate separator 7, the upper umbrella plate separator 5, and the middle umbrella plate separator 6 coincide with each other, the shape is conical, the top is closed, and it is welded to the inner side of the shell 1 through the lower bottom ring plate 702; the cooling and separation device 9, the upper umbrella plate separator 5, the middle umbrella plate separator 6, the baffle 8, and the lower umbrella plate separator 7 are sequentially installed from top to bottom inside the shell 1; a skirt support 10 is arranged below the gas-liquid separator, welded to the bottom of the shell 1, and the drain pipe 3 is wrapped inside.

[0005] The shell 1 is composed of a cylinder body 101, an upper head 102, and a lower head 103; the upper head 102 is welded above the cylinder body 101, the lower head 103 is welded below the cylinder body 101, the exhaust pipe 4 is welded and sealed at the circular opening 1021 on the upper head 102, the drain pipe 3 is welded and sealed at the circular opening 1031 on the lower head 103, and the gas-liquid inlet pipe 2 is welded and sealed at the circular opening 1011 at the lower part of the cylinder body 101.

[0006] The cooling and separation device 9 is composed of a condensate water outlet 901, a condensate water inlet 902, a condensate water pipe 903, a separation box 904, and a corrugated plate separator 905; the separation box 904 includes a bottom circular plate 9041 and a cubic cavity 9042, and is welded to the inner side of the housing 1 through the bottom circular plate 9041. The upper part of the separation box 904 is connected to the lower part of the exhaust pipe 4 through a separation box through-hole 9044; the corrugated plate separator 905 is composed of 22 corrugated plates 9051; the corrugated plates 9051 are welded to the inner side of the separation box 904 at equal intervals, and the bottom of the plate is at the same height as the bottom circular plate 9041. The upper part of the corrugated plate separator 905 is lower than the top of the inner side of the separation box 904; four groups of equal-diameter circular holes with coincident central axes are vertically opened on the side of the separation box 904 and the corrugated plate separator 905, which are the separation box side holes 9043 and the corrugated plate through-holes 9052 respectively; the condensate water pipe 903 is vertically installed through the separation box side holes 9043 and the corrugated plate through-holes 9052 along the central axis of the hole, and is connected to the condensate water outlet 901 above and the condensate water inlet 902 below; the condensate water outlet 901 and the condensate water inlet 902 are respectively welded and sealed at the upper circular opening a 1012 and the upper circular opening b 1013 of the cylinder of the housing 1.

[0007] The gas-liquid two-phase separator is applicable to the separation of alkanolamine solution and gas, and the separation process needs to maintain a low temperature; it is especially applicable to the separation of alkanolamine solvent and carbon dioxide after carbon capture by chemical absorption method.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: This high-efficiency separator for gas-liquid two-phase separation aims to solve the problem of the need for a low-temperature environment in the separation process of alkanolamine solution and CO2. Compared with the traditional pre-cooling treatment method, the present invention innovatively uses corrugated plates as the fins of the cooler, achieving a cooling effect while separating. The pre-cooling treatment process is omitted, making the entire separation system more compact, occupying less floor space, and also reducing the installation and maintenance costs. In addition, the present invention also ensures the purity of the outlet gas through multiple separations, improving the gas-liquid separation efficiency and the liquid recovery rate.

[0009] Specification Drawings

[0010] Figure 1 It is a front sectional view of the alkanolamine-CO2 mixed gas-liquid two-phase separator;

[0011] Figure 2 It is a left view of the alkanolamine-CO2 mixed gas-liquid two-phase separator;

[0012] Figure 3 It is a top view of the alkanolamine-CO2 mixed gas-liquid two-phase separator;

[0013] Figure 4Isometric view of the described amine-CO2 gas-liquid two-phase separator;

[0014] Figure 5 Isometric view of the housing of the described amine-CO2 gas-liquid two-phase separator;

[0015] Figure 6 Isometric view of the umbrella plate separator of the described amine-CO2 gas-liquid two-phase separator;

[0016] Figure 7 Front sectional view of the cooling and separation device of the described amine-CO2 gas-liquid two-phase separator;

[0017] Figure 8 Isometric view of the separation box of the described amine-CO2 gas-liquid two-phase separator;

[0018] Figure 9 Isometric view of the corrugated plate separator of the described amine-CO2 gas-liquid two-phase separator; Detailed implementation manners

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0020] The present invention provides a technical solution: an amine-CO2 gas-liquid two-phase separator. The present invention makes corresponding improvements to the technical problems mentioned in the background technology to enhance the gas-liquid separation efficiency and the recovery rate of the solution.

[0021] As Figures 1 to 5 shown, an upper umbrella plate separator 5, a middle umbrella plate separator 6, a lower umbrella plate separator 7, and a cooling and separation device 9 for separating gas and water are installed inside the housing 1. Moreover, a baffle 8 for enhancing disturbance is also installed inside the housing 1, and the baffle 8 is located in front of the outlet end of the gas-liquid inlet pipe 2; wherein the upper umbrella plate separator 5 and the middle umbrella plate separator 6 are used to separate the liquid droplets carried by the gas flow. The liquid droplets converge on the surface of the umbrella plate separator and flow downward under the action of gravity; the umbrella plate separator is conical, and the included angle between the generatrix and the horizontal direction is selected between 30-45°, and the flow area of the top openings of the upper umbrella plate separator 5 and the middle umbrella plate separator 6 is determined according to the flow rate of the gas-liquid inlet pipe 2.

[0022] A cooling and separation device 9 is installed on the upper part of the housing 1. A corrugated plate separator 905 is vertically arranged inside the cooling and separation device 9 for separating the tiny droplets carried by the air flow, so that the tiny droplets coalesce into larger droplets for sedimentation. The condensate water pipe 903 horizontally passes through the corrugated plate separator 905 and is perpendicular to all corrugated plates 9051. The corrugated plates 9051 are regarded as the fins of the condensate water pipe 903. During operation, the condensate liquid flows through the condensate water pipe 903 for heat exchange, keeping the surface of the corrugated plates 9051 at a low temperature and accelerating the separation and coalescence of the tiny droplets in the gas. The upper part of the condensate water pipe 903 is connected to the condensate water outlet 901, and the lower part is connected to the condensate water inlet 902. The condensate liquid flows through the cooling and separation device 9 from bottom to top, prolonging the residence time of the condensate water and enhancing the heat exchange effect. A drain pipe 3 is installed near the bottom of the housing 1, and the settled liquid is discharged from the drain pipe 3. An exhaust pipe 4 is installed on the housing 1, and the separated gas is discharged from the exhaust pipe 4. The bottom of the housing 1 is connected to a skirt support 10 and fixed on the ground to provide support for the gas-liquid separator and ensure the stability of each component during the separation process.

[0023] When the gas-liquid separator starts to work, the separator intakes gas through the gas-liquid inlet pipe 2, and the mixed air flow enters the cylinder body 101 through the gas-liquid inlet pipe 2. The mixed air flow is impacted and dispersed by the baffle 8, enhancing the air flow disturbance. The liquid separates from the gas by its own gravity. Specifically, the mixed air flow impacts the surface of the umbrella plate separator, and the droplets converge into a fluid on the umbrella plate separator and flow downward along the inner side wall of the cylinder body 101 under the action of gravity, fall into the lower head 103 and then are discharged through the drain pipe 3. The surface of the middle umbrella plate separator 6 is equally spaced with holes according to a certain hole opening rate. After the mixed air flow enters the perforated plate, it is evenly distributed, so that the gas flow field at the inlet of the cooling and separation device 9 is uniform, facilitating the gas-liquid separation of the subsequent fine droplets. The gas phase part of the mixed air flow after primary separation continues to rise in the cylinder body 101, enters the cooling and separation device 9, and flows through the low-temperature corrugated plates 9051 to ensure a low dissolution rate of the liquid phase and the gas phase in the mixed air flow. The tiny droplets in the air flow impact the surface of the corrugated plates 9051 due to inertia in the gaps of the corrugated plates 9051, and then adhere and coalesce on the surface of the corrugated plates 9051, flow out of the lower part of the cooling and separation device 9, and the obtained gas phase product continues to rise and is discharged through the exhaust pipe 4.

[0024] The gas-liquid two-phase separator is applicable to the separation of amine solution and gas, and the separation process needs to maintain a low temperature; it is especially applicable to the separation of the solvent and carbon dioxide after carbon capture by the chemical absorption method. In engineering applications, other components for strengthening separation can also be selected according to specific working fluids or their own needs to meet the engineering requirements.

[0025] In summary, the present invention relates to an amine-CO2 gas-liquid two-phase separator, which has multiple innovative designs inside, such as multiple umbrella plate separators, cooling and separation devices, and disturbance-enhancing baffles, etc., and can efficiently achieve gas-liquid separation. Compared with the traditional pre-cooling treatment method, the present invention innovatively uses corrugated plates as the fins of the cooler, achieving a cooling effect while separating. The pre-cooling treatment process is omitted, making the entire separation system more compact, occupying less floor space, and at the same time reducing the installation and maintenance costs. In addition, the present invention also ensures the purity of the outlet gas through multiple separations, improves the gas-liquid separation efficiency and the liquid recovery rate, and is particularly suitable for the separation of amine solvents and carbon dioxide after carbon capture by chemical absorption method.

Claims

1. An alcoholamine-CO2 mixed gas-liquid two-phase separator, characterized in that: The gas-liquid two-phase separator comprises a shell (1), a gas-liquid inlet pipe (2), a discharge pipe (3), an exhaust pipe (4), an upper umbrella plate separator (5), a middle umbrella plate separator (6), a lower umbrella plate separator (7), a baffle (8), a cooling separation device (9), and a skirt (10); the shell (1) comprises a cylinder (101), an upper head (102), a lower head (103), a lower circular opening (1011) of the cylinder, an upper circular opening a (1012) of the cylinder, an upper circular opening b (1013) of the cylinder, an upper head circular opening (1021), and a lower head circular opening (1031); the upper umbrella plate separator (5) comprises an upper umbrella cap (501), an upper umbrella plate through hole (5 02), upper bottom ring plate (503); the middle umbrella plate separator (6) comprises a middle umbrella cap (601), a middle umbrella plate through hole (602), a middle bottom ring plate (603), and an umbrella plate side hole (604); the lower umbrella plate separator (7) comprises a lower umbrella cap (701) and a lower bottom ring plate (702); the cooling separation device (9) comprises a condensate outlet (901), a condensate inlet (902), a condensate pipe (903), a separation box (904), and a corrugated plate separator (905); the separation box (904) comprises a bottom circular plate (9041), a cubic cavity (9042), a separation box side hole (9043), and a separation box through hole (9044) The corrugated plate separator (905) comprises a corrugated plate (9051) and a corrugated plate through hole (9052); the central axes of the upper umbrella plate separator (5) and the middle umbrella plate separator (6) coincide with each other, and the shape is conical; the top of the upper umbrella plate separator (5) is provided with an upper umbrella plate through hole (502), which is welded to the inner side of the shell (1) through an upper bottom ring plate (503); the top of the middle umbrella plate separator (6) is provided with a middle umbrella plate through hole (601), and the side of the middle umbrella plate separator (6) is provided with an umbrella plate side hole (604), and the side holes are arranged in a group at intervals of 45°, with a total of 8 groups, and each group has 3 holes equidistantly arranged along the busbar direction, with a total of 24 holes, which are welded to the inner side of the shell (1) through a middle bottom ring plate (603); the baffle (8) is welded On the inner side of the shell (1), above the gas-liquid inlet pipe (2), the vertical height of the baffle (8) is greater than the diameter of the gas-liquid inlet pipe (2); the central axes of the lower umbrella plate separator (7) and the upper umbrella plate separator (5) and the middle umbrella plate separator (6) coincide with each other, and the shape is conical, the top is closed, and it is welded to the inner side of the shell (1) through a lower bottom ring plate (702); the inside of the shell (1) is equipped with a cooling separation device (9), an upper umbrella plate separator (5), a middle umbrella plate separator (6), a baffle (8), and a lower umbrella plate separator (7) in sequence from top to bottom; a skirt seat (10) is arranged below the gas-liquid two-phase separator, which is welded to the bottom of the shell (1) and wraps the drain pipe (3) inside.

2. The alcoholamine-CO2 mixed gas-liquid two-phase separator according to claim 1, characterized in that: The shell (1) is composed of a cylinder (101), an upper head (102), and a lower head (103); the upper head (102) is welded on the upper part of the cylinder (101), the lower head (103) is welded on the lower part of the cylinder (101), the exhaust pipe (4) is welded and sealed at the upper circular opening (1021) of the upper head (102), the liquid discharge pipe (3) is welded and sealed at the lower circular opening (1031) of the lower head (103), and the gas-liquid inlet pipe (2) is welded and sealed at the lower circular opening (1011) of the cylinder (101).

3. The alcoholamine-CO2 mixed gas-liquid two-phase separator according to claim 1, characterized in that: The cooling and separation device (9) is composed of a condensate outlet (901), a condensate inlet (902), a condensate pipe (903), a separation box (904), and a corrugated plate separator (905); the separation box (904) includes a bottom circular plate (9041) and a cubic cavity (9042), and is welded to the inner side of the shell (1) through the bottom circular plate (9041); the upper part of the separation box (904) is connected to the lower side of the exhaust pipe (4) through the separation box through hole (9044); the corrugated plate separator (905) is composed of 22 corrugated plates (9051); the corrugated plates (9051) are welded to the inner side of the separation box (904) at equal intervals, the bottom of the plate is at the same height as the bottom circular plate (9041), and the corrugated plate separator (9051) is connected to the inner side of the exhaust pipe (4) through the bottom circular plate (9041). The upper part of the separator (905) is lower than the inner top of the separation box (904); four groups of equal-diameter circular holes whose central axes coincide with those of the corrugated plate separator (905) are provided in the vertical direction on the side of the separation box (904) and the corrugated plate separator (905), which are the separation box side holes (9043) and the corrugated plate through holes (9052); the condensate pipe (903) passes through the separation box side holes (9043) and the corrugated plate through holes (9052) vertically along the direction of the central axis of the holes and is sealed and installed, and is connected to the condensate outlet (901) at the top and to the condensate inlet (902) at the bottom; the condensate outlet (901) and the condensate inlet (902) are respectively welded and sealed at the circular opening a (1012) and the circular opening b (1013) on the cylinder of the shell (1).

4. The alcoholamine-CO2 mixed gas-liquid two-phase separator according to claim 1, characterized in that: The gas-liquid two-phase separator is suitable for separating alcohol amine solution from carbon dioxide, and the separation process needs to maintain a low temperature condition below 40° C.; it is particularly suitable for separating alcohol amine solvent and carbon dioxide after carbon capture by chemical absorption method.

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