A supergravity regeneration device and system for establishing a temperature gradient

Abstract

The present invention discloses a supergravity regeneration device and system for establishing a temperature gradient, comprising a shell, a gas outlet is arranged at the center position of the top of the shell, a lean amine liquid outlet is arranged on one side of the bottom of the shell, a hollow rotating shaft is arranged at the center position of the axial direction of the shell, the top of the hollow rotating shaft is connected to the gas outlet, the bottom of the hollow rotating shaft is fixedly connected to the solid rotating shaft, and the other end of the solid rotating shaft passes through the outside of the shell and is connected to a motor. Beneficial effect: The present invention plays the role of a condenser and establishes a temperature gradient inside the rotating bed. First, carbon dioxide moves upward with the gas phase, passes through an "S"-shaped gas-liquid heat exchange zone in the middle, and part of the water vapor in the gas phase is condensed; then the gas phase countercurrently enters the upper packing layer to exchange heat with the condensed water; and again some easily condensable components in the gas phase are removed.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to a supergravity regeneration device and system for establishing a temperature gradient. Background Art

[0002] The principle of ultra-gravity regeneration technology is to use centrifugal force to throw materials out of the rotating bed at high speed for multiphase processes that require intensified interphase transfer processes and mixing and reaction processes that require intensified micro-mixing within phases or quasi-homogeneous phases. In this process, the huge shear stress overcomes the surface tension, and the liquid is dispersed and broken by the filler to form a huge and constantly renewed surface area. In this way, excellent mass transfer and reaction conditions are formed inside the rotor. The materials can flow in parallel, countercurrent or cross-current.

[0003] In the traditional carbon dioxide capture device, the gas-liquid co-flow mode is adopted, and the outlet of the heating furnace is directly connected to the inlet of the supergravity regenerator for regeneration and separation, and no temperature gradient is established. This will lead to excessive steam volume at the gas outlet and heavy load on the condenser. In addition, the concentration of the lean amine liquid flowing out of the regeneration device is relatively high, which increases the corrosion to the equipment.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a supergravity regeneration device and system for establishing a temperature gradient to overcome the above-mentioned technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] A supergravity regeneration device for establishing a temperature gradient comprises a shell, a gas outlet is arranged at a center position of the top of the shell, a lean amine liquid outlet is arranged on one side of the bottom of the shell, a hollow rotating shaft is arranged at a center position in the axial direction of the shell, the top of the hollow rotating shaft is communicated with the gas outlet, the bottom of the hollow rotating shaft is fixedly connected to a solid rotating shaft, the other end of the solid rotating shaft passes through the outside of the shell and is connected to a motor, a rich amine liquid infusion pipe and a condensed water infusion pipe are respectively inserted on both sides of the outer surface of the shell near one end of the gas outlet, the ends of the rich amine liquid infusion pipe and the condensed water infusion pipe are extended into the hollow rotating shaft, the outer surface of the rich amine liquid infusion pipe is provided with a plurality of second liquid distributors, the outer surface of the condensed water infusion pipe is provided with a plurality of first liquid distributors, and an upper packing layer and a lower packing layer are arranged in the shell.

[0008] Preferably, the shell is gourd-shaped with a concave middle, and the hollow rotating shaft is a hollow cylindrical structure.

[0009] Preferably, the hollow rotating shaft and the shell are connected via a first dynamic seal, a third dynamic seal is provided at the connection between the solid rotating shaft and the shell, and the rich amine liquid infusion tube is connected to the hollow rotating shaft via a second dynamic seal.

[0010] Preferably, the upper packing layer is located at the upper end of the hollow rotating shaft, the lower packing layer is located at the lower end of the hollow rotating shaft, and the upper packing layer, the lower packing layer and the hollow rotating shaft are connected as a whole.

[0011] Preferably, a plurality of the second liquid distributors are evenly arranged along the circumferential direction of the bottom outer surface of the rich amine liquid infusion pipe, and a plurality of the first liquid distributors are evenly arranged along the circumferential direction of the bottom outer surface of the condensate water infusion pipe.

[0012] The invention relates to a supergravity regeneration system for establishing a temperature gradient, comprising a supergravity regeneration device, a first axial flow fan, a supergravity absorption device, a rich liquid tank, a rich liquid delivery pump, a lean and rich liquid heat exchanger, a rich liquid heater, a second axial flow fan, a condenser, a lean liquid tank, a lean liquid delivery pump, an ice machine, and a rich amine liquid regulating valve.

[0013] Preferably, the supergravity absorption device is connected to the first axial flow fan, the ice machine and the rich liquid tank respectively, the rich liquid tank is connected to the rich liquid delivery pump, and the rich liquid delivery pump is connected to the lean-rich liquid heat exchanger.

[0014] Preferably, the supergravity regeneration device is respectively connected to the rich liquid heater, the second axial flow fan, the condenser, the rich amine liquid regulating valve, and the lean liquid tank; the lean liquid tank is connected to the lean liquid delivery pump; and the lean liquid delivery pump is connected to the lean-rich liquid heat exchanger.

[0015] Preferably, the condenser is connected to the condensed water inlet pipe of the supergravity regeneration device, and the rich amine liquid inlet pipe of the supergravity regeneration device is connected to the rich liquid heater.

[0016] The beneficial effects of the present invention are:

[0017] The gourd-shaped shell is concave in the middle to allow the fluid to flow in an S shape and increase the contact time. The condensed water in the condensed water delivery pipe is delivered to the upper packing layer through the first liquid distributor, and the high-temperature rich amine liquid in the rich amine liquid delivery pipe is delivered to the lower packing layer through the second liquid distributor.

[0018] The present invention plays the role of a condenser, and establishes a temperature gradient inside the rotating bed. First, carbon dioxide moves upward with the gas phase, passing through an "S"-shaped gas-liquid heat exchange zone in the middle, and condenses part of the water vapor in the gas phase. Then the gas phase countercurrently enters the upper packing layer and exchanges heat with the condensed water. Part of the easily condensable components in the gas phase are removed again.

[0019] The present invention adopts a parallel flow mode at the lower packing layer, and the gas and liquid phases are in parallel flow contact, or it can be understood that the liquid phase is a continuous phase, and the gas passes through the packing layer in the form of bubbles. At this time, there is no need to consider the limitation of the flooding point rate, and the production capacity of the equipment is improved.

[0020] At the lower packing layer, the gas and liquid phases are in parallel contact. Due to the pressure drop, part of the superheated water in the device will be vaporized into steam, which has a stripping effect on the solution, that is, the acid gas concentration in the gas phase is much lower than its equilibrium concentration, and the concentration difference drives the separation of carbon dioxide from the solution.

[0021] Through the design of the device, the condensed water is mixed with the lean amine solution to reduce the concentration of corrosive components in the amine solution and reduce corrosion to the equipment.

[0022] Compared with the traditional regeneration tower, the present invention has improved the resolution rate of rich amine liquid. Compared with the traditional countercurrent equipment, the purity of carbon dioxide in the outlet gas is improved, the production capacity of the equipment is further improved, and the corrosion of the amine liquid to the equipment is reduced;

[0023] Since the rich amine liquid will decompose carbon dioxide at a higher temperature, and the high temperature will gasify part of the water vapor, the rich amine liquid infusion pipe conveys a two-phase flow, so a second dynamic seal is provided between the rich amine liquid infusion pipe and the hollow rotating shaft to prevent gas leakage;

[0024] The gas-liquid countercurrent in the upper packing layer requires better packing comfort to ensure the improvement of production capacity, and the upper packing layer is mainly gas-liquid heat exchange, without mass transfer, so the upper packing layer is designed to contain sparse packing and has a relatively small volume; the gas-liquid cocurrent in the lower packing layer, there is no need to consider the limitation of the flooding point rate, and it is mainly gas-liquid mass transfer, without heat exchange, so the lower packing layer is designed to contain dense packing and has a relatively large volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic structural diagram of the supergravity regeneration device of the present invention;

[0027] Figure 2 It is a structural diagram of the supergravity regeneration system.

[0028] In the figure:

[0029] 1. Rich amine liquid infusion pipe; 2. Gas outlet; 3. Condensate water infusion pipe; 4. First dynamic seal; 5. First liquid distributor; 6. Upper packing layer; 7. Second dynamic seal; 8. Lower packing layer; 9. Second liquid distributor; 10. Third dynamic seal; 11. Solid rotating shaft; 12. Lean amine liquid outlet; 13. Hollow rotating shaft; 14. First axial flow fan; 15. Super gravity absorption device; 16. Rich liquid tank; 17. Rich liquid delivery pump; 18. Lean and rich liquid heat exchanger; 19. Rich liquid heater; 20. Super gravity regeneration device; 21. Second axial flow fan; 22. Condenser; 23. Lean liquid tank; 24. Lean liquid delivery pump; 25. Ice machine; 26. Rich amine liquid regulating valve. DETAILED DESCRIPTION

[0030] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0031] According to an embodiment of the present invention, a hypergravity regeneration device and system for establishing a temperature gradient are provided.

[0032] Embodiment 1, as Figure 1- 2, according to an embodiment of the present invention, a supergravity regeneration device for establishing a temperature gradient includes a shell, a gas outlet 2 is arranged at the center position of the top of the shell, a lean amine liquid outlet 12 is arranged on one side of the bottom of the shell, a hollow rotating shaft 13 is arranged at the center position of the shell axial direction, the top of the hollow rotating shaft 13 is connected to the gas outlet 2, the bottom of the hollow rotating shaft 13 is fixedly connected to the solid rotating shaft 11, the other end of the solid rotating shaft 11 passes through the outside of the shell and is connected to the motor, a rich amine liquid infusion pipe 1 and a condensed water infusion pipe 3 are respectively inserted on both sides of the outer surface of the shell near one end of the gas outlet 2, the ends of the rich amine liquid infusion pipe 1 and the condensed water infusion pipe 3 are deep into the hollow rotating shaft 13, the outer surface of the rich amine liquid infusion pipe 1 is provided with a plurality of second liquid distributors 9, and the outer surface of the condensed water infusion pipe 3 is provided with a plurality of first liquid A body distributor 5, wherein an upper packing layer 6 and a lower packing layer 8 are arranged in the shell, the shell is gourd-shaped with a concave middle, the hollow rotating shaft 13 is a hollow cylindrical structure, the hollow rotating shaft 13 is connected to the shell through a first dynamic seal 4, a third dynamic seal 10 is arranged at the connection between the solid rotating shaft 11 and the shell, the rich amine liquid infusion pipe 1 is connected to the hollow rotating shaft 13 through a second dynamic seal 7, the upper packing layer 6 is located at the upper end of the hollow rotating shaft 13, the lower packing layer 8 is located at the lower end of the hollow rotating shaft 13, the upper packing layer 6, the lower packing layer 8 and the hollow rotating shaft 13 are connected as a whole, a plurality of the second liquid distributors 9 are evenly arranged along the circumferential direction of the bottom outer surface of the rich amine liquid infusion pipe 1, and a plurality of the first liquid distributors 5 are evenly arranged along the circumferential direction of the bottom outer surface of the condensate water infusion pipe 3;

[0033] The condensed water delivery pipe 3 delivers water to the upper packing layer 6 of the super gravity regeneration device, and the rich amine liquid delivery pipe 1 delivers high-temperature rich amine liquid to the lower packing layer 8 of the super gravity regeneration device 20. (The rich amine liquid regulating valve 26 can be used to guide the rich liquid that has not been heated by the rich liquid heater 19 to mix into the condensed water to adjust the temperature gradient.) The condensed water delivery pipe 3 sprays the condensed water evenly onto the inner surface of the upper packing layer 6 of the super gravity regeneration device 20 through the liquid distributor, and the rich amine liquid delivery pipe 1 sprays the gas-liquid two-phase rich amine liquid evenly onto the inner surface of the lower packing layer 8 of the super gravity regeneration device 20 through the liquid distributor.

[0034] A temperature gradient is established in the supergravity device. The carbon-rich liquid containing gas-liquid two phases heated to a relatively high temperature is introduced into the lower packing layer 8, and condensed water is introduced into the upper packing layer 6. While the lower packing layer 8 undergoes a supergravity regeneration process to separate the gas-liquid two phases, the supergravity device drives the upper packing layer 6 to rotate, thereby forming a temperature gradient.

[0035] The rich amine liquid undergoes strong disturbances in the packing layer, and carbon dioxide is decomposed at high temperature. At the lower packing layer, the gas and liquid phases are in parallel contact. Due to the pressure drop, part of the superheated water will be vaporized into steam, and the steam has a stripping effect on the solution, that is, the acid gas concentration in the gas phase is much lower than its equilibrium concentration, and the concentration difference drives the separation of carbon dioxide from the solution. First, carbon dioxide moves upward with the gas phase, passing through an "S"-shaped gas-liquid heat exchange zone in the middle, and part of the water vapor in the gas phase is condensed. Then the gas phase countercurrently enters the upper packing layer 6 and exchanges heat with the condensed water. Some of the easily condensable components in the gas phase are removed again. Finally, the decomposed carbon dioxide is discharged from the gas outlet 2. The condensed water is mixed with the lean amine liquid and discharged from the lean amine liquid outlet 12.

[0036] Embodiment 2, as Figure 1 - 2, a supergravity regeneration system for establishing a temperature gradient according to an embodiment of the present invention comprises a supergravity regeneration device 20, a first axial flow fan 14, a supergravity absorption device 15, a rich liquid tank 16, a rich liquid delivery pump 17, a lean and rich liquid heat exchanger 18, a rich liquid heater 19, a second axial flow fan 21, a condenser 22, a lean liquid tank 23, a lean liquid delivery pump 24, an ice machine 25, and a rich amine liquid regulating valve 26, wherein the supergravity absorption device 15 is respectively connected to the first axial flow fan 14, the ice machine 25, and the rich liquid tank 16, and the rich liquid tank 16 is connected to the rich liquid delivery pump 17. , the rich liquid delivery pump 17 is connected to the lean-rich liquid heat exchanger 18, the super gravity regeneration device 20 is respectively connected to the rich liquid heater 19, the second axial flow fan 21, the condenser 22, the rich amine liquid regulating valve 26, and the lean liquid tank 23, the lean liquid tank 23 is connected to the lean liquid delivery pump 24, the lean liquid delivery pump 24 is connected to the lean-rich liquid heat exchanger 18, the condenser 22 is connected to the condensate delivery pipe 3 of the super gravity regeneration device 20, and the rich amine liquid delivery pipe 1 of the super gravity regeneration device 20 is connected to the rich liquid heater 19;

[0037] The natural gas containing carbon dioxide enters the supergravity absorption device 15, and the carbon dioxide is absorbed by the absorption liquid to become rich amine liquid. The rich amine liquid enters the rich liquid tank 16, and is pressurized by the rich liquid delivery pump 17. After the rich amine liquid is heated to gas-liquid two-phase by the rich liquid heater 19, it is delivered to the lower packing layer 8 inside the supergravity regeneration device 20 by the rich amine liquid delivery pipe 1. The second axial flow fan 21 delivers the uncondensed gas discharged from the gas outlet 2 to the condenser 22, and the condensed water is delivered to the upper packing layer 6 inside the supergravity regeneration device 20 by the condensed water delivery pipe 3. (The rich amine liquid regulating valve 26 can be used to guide the rich liquid that has not been heated by the rich liquid heater 19 to mix with the condensed water to adjust the temperature gradient.) After the lean amine liquid formed by decarbonization in the supergravity regeneration device 20 is discharged from the lean amine liquid outlet 12, it is output through the lean liquid tank 23 and the lean liquid delivery pump 24, and after being cooled by the ice machine 25, it is delivered to the supergravity absorption device 15 for further reuse.

[0038] Ethanolamine (MEA) solution is used for decarbonization, and the concentration of the amine solution is controlled at about 15wt% to 30wt%. The higher the concentration, the better the decarbonization effect. However, the corrosiveness will increase. The rich amine solution is heated to gas-liquid two-phase by the rich liquid heater 19, wherein the temperature of the rich amine solution is controlled between 105°C and 120°C to ensure that the amine solution decomposes and releases carbon dioxide. The amount of carbon dioxide carried by each mole of ethanolamine molecule is between 0.15mol (analysis) and 0.45mol (absorption).

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A supergravity regeneration device for establishing a temperature gradient, characterized in that: The invention comprises a shell, wherein a gas outlet (2) is arranged at the center position of the top of the shell, a lean amine liquid outlet (12) is arranged at one side of the bottom of the shell, a hollow rotating shaft (13) is arranged at the center position of the shell in the axial direction, the top of the hollow rotating shaft (13) is communicated with the gas outlet (2), the bottom of the hollow rotating shaft (13) is fixedly connected to the solid rotating shaft (11), the other end of the solid rotating shaft (11) penetrates to the outside of the shell and is connected to a motor, a rich amine liquid infusion pipe (1) and a condensed water infusion pipe (3) are respectively inserted into the two sides of the outer surface of the shell near one end of the gas outlet (2), the ends of the rich amine liquid infusion pipe (1) and the condensed water infusion pipe (3) are deeply inserted into the hollow rotating shaft (13), the outer surface of the rich amine liquid infusion pipe (1) is provided with a plurality of second liquid distributors (9), the outer surface of the condensed water infusion pipe (3) is provided with a plurality of first liquid distributors (5), and an upper packing layer (6) and a lower packing layer (8) are arranged in the shell; The shell is gourd-shaped and concave in the middle, and the hollow rotating shaft (13) is a hollow cylindrical structure; The hollow rotating shaft (13) and the housing are connected via a first dynamic seal (4); a third dynamic seal (10) is provided at the connection between the solid rotating shaft (11) and the housing; and the rich amine liquid infusion pipe (1) is connected to the hollow rotating shaft (13) via a second dynamic seal (7); The upper packing layer (6) is located at the upper end of the hollow rotating shaft (13), the lower packing layer (8) is located at the lower end of the hollow rotating shaft (13), and the upper packing layer (6), the lower packing layer (8) and the hollow rotating shaft (13) are connected as a whole.

2. A supergravity regeneration device for establishing a temperature gradient according to claim 1, characterized in that: A plurality of the second liquid distributors (9) are evenly arranged along the circumferential direction of the bottom outer surface of the rich amine liquid delivery pipe (1), and a plurality of the first liquid distributors (5) are evenly arranged along the circumferential direction of the bottom outer surface of the condensed water delivery pipe (3).

3. A hypergravity regeneration system for establishing a temperature gradient, based on a hypergravity regeneration device for establishing a temperature gradient as claimed in any one of claims 1 to 2, characterized in that: The invention comprises a supergravity regeneration device (20), a first axial flow fan (14), a supergravity absorption device (15), a rich liquid tank (16), a rich liquid delivery pump (17), a lean and rich liquid heat exchanger (18), a rich liquid heater (19), a second axial flow fan (21), a condenser (22), a lean liquid tank (23), a lean liquid delivery pump (24), an ice machine (25), and a rich amine liquid regulating valve (26).

4. A hypergravity regeneration system for establishing a temperature gradient as claimed in claim 3, characterized in that: The supergravity absorption device (15) is respectively connected to the first axial flow fan (14), the ice machine (25), and the rich liquid tank (16); the rich liquid tank (16) is connected to the rich liquid delivery pump (17); and the rich liquid delivery pump (17) is connected to the lean-rich liquid heat exchanger (18).

5. A hypergravity regeneration system for establishing a temperature gradient as claimed in claim 4, characterized in that: The supergravity regeneration device (20) is respectively connected to the rich liquid heater (19), the second axial flow fan (21), the condenser (22), the rich amine liquid regulating valve (26), and the lean liquid tank (23); the lean liquid tank (23) is connected to the lean liquid delivery pump (24); and the lean liquid delivery pump (24) is connected to the lean-rich liquid heat exchanger (18).

6. A hypergravity regeneration system for establishing a temperature gradient as claimed in claim 5, characterized in that: The condenser (22) is connected to the condensed water delivery pipe (3) of the supergravity regeneration device (20), and the rich amine liquid delivery pipe (1) of the supergravity regeneration device (20) is connected to the rich liquid heater (19).

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