A photo-assisted absorbent regeneration device and a carbon dioxide capture system

Abstract

The present invention belongs to the technical field of carbon capture, and particularly relates to a photo-assisted absorbent regeneration device and a carbon dioxide capture system, including: a photo-assisted absorbent regeneration device, including: a photoreaction device cylinder body; a solar heat collection device arranged above the photoreaction device cylinder body; a photocatalytic responsive agent arranged in the middle of the photoreaction device cylinder body; a heat storage circulation device arranged in the photoreaction device cylinder body, and the heat storage circulation device is used to transfer the heat absorbed by the solar heat collection device into the photoreaction device cylinder body. And a carbon dioxide capture system using the above-mentioned photo-assisted absorbent regeneration device. The present invention utilizes the light response ability of the alkanolamine absorbent and the photo-responsive agent, significantly enhances the proton transfer during the amine solution regeneration process, strengthens the absorbent regeneration efficiency, and realizes the effect of energy conservation and consumption reduction by efficiently collecting solar energy, reasonably designing solar heat conversion and effectively distributing high-quality heat sources.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon capture, and particularly relates to a photo-assisted absorbent regeneration device and a carbon dioxide capture system. Background Art

[0002] The chemical absorption method using alkanolamine as an absorbent is an effective carbon dioxide capture technology, which has high carbon dioxide capture efficiency and adaptability, and does not require large-scale transformation of existing carbon dioxide emission industries (such as power, steel, cement, etc.). It is one of the most mature carbon capture technologies at present. However, in actual applications, due to the poor proton transfer ability in alkaline solvents and the strong binding force between amine solvents and carbon dioxide, it faces the problems of large steam consumption and high energy consumption during the regeneration process.

[0003] In the prior art, proton transfer acceleration is an effective way to enhance absorbent regeneration. Developing an efficient proton transfer enhancement strategy to reduce the high regeneration energy consumption of traditional amine methods has become an urgent problem to be solved in current carbon capture technologies. Utilizing external field energy to enhance absorbent regeneration is an effective way to reduce carbon capture energy consumption. Therefore, we propose a photo-assisted absorbent regeneration device and a carbon dioxide capture system to solve the problem of high regeneration energy consumption of traditional amine methods. Summary of the Invention

[0004] The purpose of the present invention is to provide a photo-assisted absorbent regeneration device and a carbon dioxide capture system to solve the above problems.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] A photo-assisted absorbent regeneration device, comprising:

[0007] A photoreaction device cylinder body, one side of the top of the photoreaction device cylinder body is communicated with a rich liquid inlet of the photoregeneration device, the other side of the top of the photoreaction device cylinder body is communicated with a carbon dioxide outlet of the photoregeneration device, and the bottom of the photoreaction device cylinder body is communicated with an amine liquid outlet of the photoregeneration device;

[0008] A photothermal collection device, which is arranged above the photoreaction device cylinder body, and the bottom of the photothermal collection device is optically communicated with the photoreaction device cylinder body;

[0009] A photocatalytic responsive agent, which is arranged in the middle of the photoreaction device cylinder body;

[0010] A heat storage circulation device, which is arranged in the photoreaction device cylinder body, and the heat storage circulation device is heat-exchanged with the photoreaction device cylinder body and the photothermal collection device, and the heat storage circulation device is used to transfer the heat absorbed by the photothermal collection device into the photoreaction device cylinder body.

[0011] According to the above-mentioned light-assisted absorbent regeneration device, the photoreactive agent is arranged in the cylindrical body of the photoreaction device in the form of a shaped catalyst loaded into a non-woven fabric water-permeable bag. Since the pores on the non-woven fabric water-permeable bag are relatively small, the shaped photocatalyst will not flow out of the pores, ensuring that the amine liquid can penetrate into the bag. The stirrer can drive the amine liquid and the shaped photoreactive agent to fully contact and regenerate, effectively reducing the risk of solid sedimentation and pipeline blockage and extending the service life of the system.

[0012] According to the above-mentioned light-assisted absorbent regeneration device, the photoreactive agent can be TiO2.

[0013] According to the above-mentioned light-assisted absorbent regeneration device, the photothermal collection device includes:

[0014] A light collection container, which has a cavity inside. A first light-transmitting device is fixedly connected to the top of the light collection container, and a second light-transmitting device is fixedly connected to the bottom. The light collection container is optically connected to the cylindrical body of the photoreaction device through the second light-transmitting device;

[0015] A light inlet channel is arranged at the top of the first light-transmitting device, and the bottom of the light inlet channel is optically connected to the top of the first light-transmitting device;

[0016] A sunlight receiving device is arranged at the top of the light inlet channel, and the bottom of the sunlight receiving device is optically connected to the top of the light inlet channel;

[0017] A light directional reflection and absorption device is arranged in the cavity. The light directional reflection and absorption device is used to reflect the light entering the cavity multiple times and absorb heat energy.

[0018] According to the above-mentioned light-assisted absorbent regeneration device, the shape of the sunlight receiving device is a downwardly concave bowl shape, which is used to sense and receive sunlight in the environment.

[0019] According to the above-mentioned light-assisted absorbent regeneration device, the materials of the first light-transmitting device and the second light-transmitting device are high borosilicate glass, and the plate surfaces of the first light-transmitting device and the second light-transmitting device are in the horizontal direction.

[0020] According to the above-mentioned light-assisted absorbent regeneration device, it further includes: the light directional reflection and absorption device includes a plurality of corrugated plates arranged in parallel. The corrugated plates are made of mirror stainless steel, the plate surfaces of the corrugated plates are in the vertical direction, and the plurality of corrugated plates are fixed in the cavity. The plurality of corrugated plates reflect the light entering the cavity multiple times and absorb heat energy.

[0021] According to the above-mentioned light-assisted absorbent regeneration device, the heat storage and circulation device includes:

[0022] The heat exchange pipeline is arranged inside the cylinder body of the photoreaction device and conducts heat exchange with the liquid inside the cylinder body of the photoreaction device. The inlet of the heat exchange pipeline is connected and arranged through the outlet of the fluid circulation pipe on one side of the bottom of the cavity. The outlet of the heat exchange pipeline is connected to the inlet of a blower, and the outlet of the blower is connected to the other side of the bottom of the cavity through the fluid circulation pipe inlet.

[0023] According to the above-mentioned photoreagent regenerator, the heat exchange pipeline is arranged in a horizontally placed coil shape. The material of the heat exchange pipeline is stainless steel, which has good corrosion resistance and high-temperature resistance. The heat storage material is filled inside the heat exchange pipeline. The heat storage material inside the heat exchange pipeline can store the heat converted from light energy in the light collection container to provide heat for the photoregeneration reaction. The fluid after heat exchange returns to the cavity of the light collection container and is heated again.

[0024] According to the above-mentioned photoreagent regenerator, the heat storage material can be molten salt or water.

[0025] According to the above-mentioned photoreagent regenerator, the power device that can drive the fluid to flow can be a blower.

[0026] According to the above-mentioned photoreagent regenerator, the heat-conducting fluid flowing through the fluid circulation channel, the outlet of the fluid circulation pipe and the inlet of the fluid circulation pipe can be helium or air.

[0027] According to the above-mentioned photoreagent regenerator, heat-insulating layers are provided on the outer walls of the light collection container and the cylinder body of the photoreaction device.

[0028] The solar energy collection and storage device of the present invention can convert light energy into heat energy more efficiently, can avoid the loss of light energy and heat energy, and can also heat the heat storage medium to a temperature of about 150 °C, thereby obtaining high-quality heat energy.

[0029] According to the above-mentioned photoreagent regenerator, it further includes:

[0030] A stirrer, which is rotatably arranged at the bottom of the cylinder body of the photoreaction device.

[0031] A carbon dioxide capture system includes a connected carbon dioxide absorption device, a heat exchange device and a carbon dioxide regeneration device, and is also connected to the above-mentioned photoreagent regenerator.

[0032] According to the above-mentioned carbon dioxide capture system, the carbon dioxide absorption device includes:

[0033] Absorption tower, flue gas enters from the flue gas inlet on one side at the bottom of the absorption tower, the absorption liquid moves downwards from top to bottom in the absorption tower to absorb carbon dioxide in the flue gas and convert it into decarbonized flue gas, the decarbonized flue gas is discharged from the flue gas outlet at the top of the absorption tower, and the absorption liquid is discharged from the rich liquid outlet of the absorption tower connected to the bottom of the absorption tower;

[0034] First liquid pump, the inlet of the first liquid pump is connected to the pipeline of the rich liquid outlet of the absorption tower, the outlet pipeline of the first liquid pump is connected to the rich liquid pipeline inlet of the heat exchange device, and the rich liquid pipeline outlet of the heat exchange device is connected to the rich liquid inlet of the carbon dioxide regeneration device and the rich liquid inlet of the photo-regeneration device;

[0035] Third liquid pump, the inlet of the third liquid pump is connected to the outlet of the lean liquid pipeline of the heat exchange device, the lean liquid pipeline inlet of the heat exchange device is connected to the lean liquid outlet of the carbon dioxide regeneration device, the outlet of the third liquid pump is connected to the lean liquid inlet of the absorption tower, and the lean liquid inlet of the absorption tower is connected and arranged on one side at the top of the absorption tower.

[0036] According to the above carbon dioxide capture system, the heat exchange device includes a heat exchanger, a reboiler and a condenser;

[0037] The rich liquid pipeline inlet of the heat exchanger is connected to the outlet of the first liquid pump;

[0038] The rich liquid pipeline outlet of the heat exchanger is connected to the rich liquid inlet of the photo-regeneration device and the rich liquid inlet of the carbon dioxide regeneration device;

[0039] The lean liquid pipeline inlet of the heat exchanger is connected to the lean liquid outlet of the carbon dioxide regeneration device;

[0040] The lean liquid pipeline outlet of the heat exchanger is connected to the inlet of the third liquid pump;

[0041] The reboiler is connected to one side of the lean liquid outlet of the carbon dioxide regeneration device to provide heat for the reaction in the carbon dioxide regeneration device;

[0042] The inlet of the condenser is connected to the carbon dioxide outlet of the photo-regeneration device and the carbon dioxide outlet of the carbon dioxide regeneration device. The condenser is used to condense the water vapor and absorption liquid in the wet carbon dioxide gas. The condensed carbon dioxide gas is transported to the carbon dioxide storage tank through a pipeline, and the condensate is transported to the inlet of the fourth liquid pump through a pipeline. The outlet of the fourth liquid pump is connected to the lean liquid inlet of the absorption tower through a pipeline.

[0043] According to the above carbon dioxide capture system, the carbon dioxide regeneration device includes:

[0044] The thermal regeneration tower is connected to the amine liquid outlet of the photo-regeneration device and the rich liquid pipeline outlet of the heat exchanger through the rich liquid inlet of the thermal regeneration tower; the amine liquid outlet of the photo-regeneration device is connected to the inlet of the second liquid pump, and the outlet of the second liquid pump is connected to the rich liquid inlet of the thermal regeneration tower;

[0045] The top of the thermal regeneration tower is connected to the inlet of the condenser through the carbon dioxide outlet of the thermal regeneration tower, and the bottom of the thermal regeneration tower is connected to the inlet of the lean liquid pipeline of the heat exchanger through the rich liquid outlet of the thermal regeneration tower;

[0046] The reboiler is thermally exchanged and arranged at the bottom of the thermal regeneration tower;

[0047] The outlet of the fourth liquid pump is connected to the thermal regeneration tower, and is used for the condensate to flow back into the thermal regeneration tower to participate in thermal regeneration.

[0048] Compared with the prior art, the present invention has the following advantages and technical effects:

[0049] During use, light is collected by the photo-thermal collection device and transmitted into the cylinder body of the photo-reaction device, providing excitation light energy for the photocatalytic responsive agent. At the same time, the heat energy generated by the light is absorbed, and the heat energy is transferred into the cylinder body of the photo-reaction device through the heat storage circulation device. The rich liquid enters the cylinder body of the photo-reaction device through the rich liquid inlet of the photo-regeneration device. Under the combined action of light and heat energy, the amine solvent is regenerated, and the carbon dioxide released by the regeneration reaction is discharged from the carbon dioxide outlet of the photo-regeneration device, and the lean liquid is discharged from the amine liquid outlet of the photo-regeneration device.

[0050] In summary, the present invention has the following advantages:

[0051] (1) The photo-assisted absorbent regeneration and desorption device of the present invention guides light to the cylinder body of the photo-reaction device through the photo-thermal collection device, and utilizes the light response ability of the alkanolamine absorbent and the photo-responsive agent to significantly enhance the proton transfer during the amine liquid regeneration process and strengthen the absorbent regeneration efficiency;

[0052] (2) The photo-assisted absorbent regeneration reactor and carbon dioxide capture system of the present invention use cleaner and pollution-free solar energy as part of the energy supply for the carbon capture project. By efficiently collecting light energy, reasonably designing photo-thermal conversion, and effectively distributing high-quality heat sources, coupling the advantages of photo-thermal / photo-catalytic regeneration and thermal regeneration, the effects of high-efficiency hierarchical regeneration of amine liquid, cascaded utilization of energy, energy conservation and consumption reduction are achieved. Description of the Drawings

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0054] Figure 1 Structural schematic diagram of the light-assisted absorbent regeneration device of the present invention;

[0055] Figure 2 Structural schematic diagram of the carbon dioxide capture system of the present invention;

[0056] Figure 3 Top view of the photocatalytic responder structure of the present invention;

[0057] Among them, 101, absorption tower; 102, flue gas; 103, decarbonized flue gas; 104, rich liquid outlet of the absorption tower; 105, lean liquid inlet of the absorption tower; 201, thermal regeneration tower; 202, rich liquid inlet of the thermal regeneration tower; 203, rich liquid outlet of the thermal regeneration tower; 204, carbon dioxide outlet of the thermal regeneration tower; 302, rich liquid inlet of the light regeneration device; 303, amine liquid outlet of the light regeneration device; 304, carbon dioxide outlet of the light regeneration device; 305, photocatalytic responder; 311, sunlight receiving device; 312, light inlet channel; 313, light collection container; 314, first light transmission device; 315, light directional reflection and absorption device; 316, cavity; 317, second light transmission device; 318, fluid circulation pipe outlet; 319, fluid circulation pipe inlet; 321, light reaction device cylinder; 322, heat exchange pipeline; 323, stirrer; 330, solar concentrator control box; 401, heat exchanger; 402, reboiler; 403, condenser; 501, carbon dioxide storage tank; 601, first liquid pump; 602, second liquid pump; 603, third liquid pump; 604, fourth liquid pump; 605, fan. Detailed implementation manners

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0059] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0060] Refer to Figures 1 to 3, the present invention discloses a light-assisted absorbent regeneration device, comprising:

[0061] A light reaction device cylinder body 321, one side of the top of the light reaction device cylinder body 321 is communicated with a rich liquid inlet 302 of the light regeneration device, the other side of the top of the light reaction device cylinder body 321 is communicated with a carbon dioxide outlet 304 of the light regeneration device, and the bottom of the light reaction device cylinder body 321 is communicated with an amine liquid outlet 303 of the light regeneration device;

[0062] A light heat collection device, arranged above the light reaction device cylinder body 321, and the bottom of the light heat collection device is optically communicated with the light reaction device cylinder body 321;

[0063] A photocatalytic responder 305, arranged in the middle of the light reaction device cylinder body 321;

[0064] A heat storage circulation device, arranged in the light reaction device cylinder body 321, the heat storage circulation device is arranged for heat exchange with the light reaction device cylinder body 321 and the light heat collection device, and the heat storage circulation device is used to transfer the heat absorbed by the light heat collection device into the light reaction device cylinder body 321.

[0065] During use, light is collected by the light heat collection device and transported into the light reaction device cylinder body 321 to provide excitation light energy for the photocatalytic responder 305. At the same time, the heat energy generated by the light is absorbed, and the heat energy is transferred into the light reaction device cylinder body 321 through the heat storage circulation device. The rich liquid enters the light reaction device cylinder body 321 through the rich liquid inlet 302 of the light regeneration device. Under the combined action of light and heat energy, the amine solvent is regenerated. The carbon dioxide released by the regeneration reaction is discharged from the carbon dioxide outlet 304 of the light regeneration device, and the lean liquid is discharged from the amine liquid outlet 303 of the light regeneration device. In this way, the problems of large steam consumption and high energy consumption during the desorption of the rich liquid are reduced.

[0066] The photocatalytic responder 305 is arranged in the light reaction device cylinder body 321 by using a method of loading a shaped catalyst into a non-woven fabric water-permeable bag. Since the pores on the non-woven fabric water-permeable bag are relatively small, the shaped photocatalyst will not flow out of the pores, ensuring that the amine liquid can penetrate into the bag. The stirrer 323 can drive the amine liquid and the shaped photocatalytic responder to fully contact and regenerate, while effectively reducing the risk of solid sedimentation and pipeline blockage and extending the service life of the system.

[0067] As an optional implementation manner, the light heat collection device comprises:

[0068] A light collection container 313, with a cavity 316 inside the light collection container 313. A first light-transmitting device 314 is fixedly connected to the top of the light collection container 313, and a second light-transmitting device 317 is fixedly connected to the bottom. The light collection container 313 is optically communicated with the light reaction device cylinder body 321 through the second light-transmitting device 317;

[0069] The light incident channel 312 is arranged on the top of the first light-transmitting device 314, and the bottom of the light incident channel 312 is optically connected to the top of the first light-transmitting device 314;

[0070] The sunlight receiving device 311 is arranged on the top of the light incident channel 312, and the bottom of the sunlight receiving device 311 is optically connected to the top of the light incident channel 312;

[0071] The light directional reflection and absorption device 315 is arranged in the cavity 316, and the light directional reflection and absorption device 315 is used for reflecting the light entering the cavity 316 multiple times and absorbing heat energy.

[0072] As an optional implementation manner, it further includes: the light directional reflection and absorption device 315 includes a plurality of corrugated plates arranged in parallel. The corrugated plates are made of mirror stainless steel, and the plate surfaces of the corrugated plates are in the vertical direction. The plurality of corrugated plates are fixed in the cavity 316, and the light entering the cavity 316 is reflected multiple times and heat energy is absorbed by the plurality of corrugated plates.

[0073] The solar heat collection device includes the sunlight receiving device 311. The light incident channel 312 is arranged below the sunlight receiving device 311. The sunlight receiving device 311 is connected to the light collection container 313 through the light incident channel 312. The light collection container 313 is of a cavity structure. A first light-transmitting device 314 is arranged on the upper wall of the light collection container 313. The sunlight received by the sunlight receiving device 311 can enter the light collection container 313 through the light incident channel 312 and the first light-transmitting device 314 in sequence. A light directional reflection and absorption device 315 is arranged in the light collection container 313. The light directional reflection and absorption device 315 can introduce the light entering the first light-transmitting device 314 into the interior of the cavity of the light collection container 313 through multiple reflections and convert the light energy into heat energy. A first light-transmitting device 314 is arranged on the lower wall of the light collection container 313; The upper part of the light reaction device cylinder 321 is connected to the light collection container 313 through the first light-transmitting device 314. There is a cavity in the light reaction device cylinder 321. The light energy introduced into the interior of the cavity of the light collection container 313 irradiates the interior of the light reaction device cylinder 321 through the second light-transmitting device 317, providing excitation light energy for the photocatalytic responder 305.

[0074] As an optional implementation manner, the heat storage circulation device includes:

[0075] The heat exchange pipeline 322 is arranged in the light reaction device cylinder 321 and exchanges heat with the liquid in the light reaction device cylinder 321. The inlet of the heat exchange pipeline 322 is connected to the bottom side of the cavity 316 through the fluid circulation pipe outlet 318. The outlet of the heat exchange pipeline 322 is connected to the inlet of the fan 605. The outlet of the fan 605 is connected to the other side of the bottom of the cavity 316 through the fluid circulation pipe inlet 319.

[0076] The heat exchange pipeline 322 is spirally embedded in the inner wall of the photoreaction device cylinder 321 in a coil shape, and the heat storage material is filled in the heat exchange pipeline 322. The heat storage material can be molten salt or water.

[0077] A cavity 316 is provided in the light collection container 313. The cavity 316 passes through between a plurality of juxtaposed corrugated plates of the light directional reflection and absorption device 315. The hot end of the cavity 316 communicates with the fluid circulation pipe outlet 318. The fluid circulation pipe outlet 318 communicates with the inlet of the heat exchange pipeline 322 in the photoreaction device cavity. A fan 605 capable of driving the fluid is connected in series at the outlet of the heat exchange pipeline 322. The fan 605 capable of driving the fluid is connected in series with the fluid circulation pipe inlet 319. The fluid circulation pipe inlet 319 communicates with the hot end of the cavity 316.

[0078] The heat energy converted by the light directional reflection and absorption device 315 in the light collection cavity passes through the cavity 316, and then enters the heat exchange pipeline 322 in the photoreaction device cylinder 321 from the fluid circulation pipe outlet 318 to heat the heat storage material. The stored heat energy is used to supply heat to the amine solution. The fluid that has completed heat supply returns to the photoreaction cavity under the action of the fan 605 capable of driving the fluid, and once again realizes the collection and transfer of the hot fluid.

[0079] As an optional implementation manner, it further includes:

[0080] A stirrer 323 is rotatably arranged at the bottom of the photoreaction device cylinder 321.

[0081] The stirrer 323 stirs to make the heated amine solution and the photocatalytic responder 305 react fully.

[0082] Furthermore, the photothermal collection device is electrically connected to a solar concentrator control box 330.

[0083] The sunlight receiving device 311 is electrically connected to the solar concentrator control box 330. The solar concentrator control box 330 is used to adjust the orientation of the sunlight receiving device 311 according to the sunlight angle. It includes a solar tracking module and a temperature sensor module, which are responsible for controlling the operating state of the entire light-assisted absorbent regeneration system. Under the action of the solar tracking module, the sunlight receiving device 311 rotates with the position of the sun, ensuring the time and position of sun exposure, so that the effect of sunlight focusing is more obvious; the temperature sensing module real-time identifies the temperatures inside the light collection container 313 and the photoreaction device cylinder 321, ensuring the orderly progress of the reaction inside the light-assisted absorbent regeneration device.

[0084] A carbon dioxide capture system includes a carbon dioxide absorption device, a heat exchange device, and a carbon dioxide regeneration device that are connected in communication, and is also connected in communication with the above-mentioned light-assisted absorbent regeneration device.

[0085] As an alternative embodiment, the carbon dioxide absorption device comprises:

[0086] An absorption tower 101, into which the flue gas 102 enters through a flue gas inlet on one side at the bottom of the absorption tower 101. The absorption liquid moves downward from top to bottom in the absorption tower 101 to absorb carbon dioxide in the flue gas 102 and convert it into decarbonized flue gas 103, which is discharged from the flue gas outlet at the top of the absorption tower 101. The absorption liquid is discharged from the rich liquid outlet 104 of the absorption tower that is connected to the bottom of the absorption tower 101;

[0087] A first liquid pump 601, the inlet of which is connected to the rich liquid outlet 104 of the absorption tower through a pipeline. The outlet pipeline of the first liquid pump 601 is connected to the rich liquid pipeline inlet of a heat exchange device, and the rich liquid pipeline outlet of the heat exchange device is connected to the rich liquid inlet of the carbon dioxide regeneration device and the rich liquid inlet 302 of the photo-regeneration device;

[0088] A third liquid pump 603, the inlet of which is connected to the lean liquid pipeline outlet of the heat exchange device. The lean liquid pipeline inlet of the heat exchange device is connected to the lean liquid outlet of the carbon dioxide regeneration device. The outlet of the third liquid pump 603 is connected to the lean liquid inlet 105 of the absorption tower, and the lean liquid inlet 105 of the absorption tower is connected and arranged on one side at the top of the absorption tower 101.

[0089] As an alternative embodiment, the heat exchange device comprises a heat exchanger 401, a reboiler 402 and a condenser 403;

[0090] The rich liquid pipeline inlet of the heat exchanger 401 is connected to the outlet of the first liquid pump 601;

[0091] The rich liquid pipeline outlet of the heat exchanger 401 is connected to the rich liquid inlet 302 of the photo-regeneration device and the rich liquid inlet of the carbon dioxide regeneration device;

[0092] The lean liquid pipeline inlet of the heat exchanger 401 is connected to the lean liquid outlet of the carbon dioxide regeneration device;

[0093] The lean liquid pipeline outlet of the heat exchanger 401 is connected to the inlet of the third liquid pump 603;

[0094] The reboiler 402 is connected to one side of the lean liquid outlet of the carbon dioxide regeneration device and is used to provide heat for the reaction in the carbon dioxide regeneration device;

[0095] The inlet of the condenser 403 is connected to the carbon dioxide outlet 304 of the photo-regeneration device and the carbon dioxide outlet of the carbon dioxide regeneration device. The condenser 403 is used to condense the water vapor and the absorption liquid in the wet carbon dioxide gas. The condensed carbon dioxide gas is transported to the carbon dioxide storage tank 501 through a pipeline, and the condensate is transported to the inlet of the fourth liquid pump 604 through a pipeline. The outlet of the fourth liquid pump 604 is connected to the lean liquid inlet 105 of the absorption tower through a pipeline.

[0096] As an alternative embodiment, the carbon dioxide regeneration device includes:

[0097] A thermal regeneration tower 201, which is connected through a rich liquid inlet 202 of the thermal regeneration tower to the amine liquid outlet 303 of the photo-regeneration device and the outlet of the rich liquid pipeline of the heat exchanger 401; the amine liquid outlet 303 of the photo-regeneration device is connected to the inlet of a second liquid pump 602, and the outlet of the second liquid pump 602 is connected to the rich liquid inlet 202 of the thermal regeneration tower.

[0098] The top of the thermal regeneration tower 201 is connected through a carbon dioxide outlet 204 of the thermal regeneration tower to the inlet of a condenser 403, and the bottom of the thermal regeneration tower 201 is connected through a rich liquid outlet 203 of the thermal regeneration tower to the inlet of the lean liquid pipeline of the heat exchanger 401.

[0099] A reboiler 402 is thermally exchanged and arranged at the bottom of the thermal regeneration tower 201.

[0100] The outlet of a fourth liquid pump 604 is connected to the thermal regeneration tower 201, and is used to reflux the condensate into the thermal regeneration tower 201 to participate in thermal regeneration.

[0101] Refer to Figure 2 , the present invention discloses a reactor for photo-assisted absorbent regeneration and a carbon dioxide capture system, including: an absorption tower 101, a thermal regeneration tower 201, a photo-assisted absorbent regeneration device, a heat exchanger 401, a reboiler 402, a condenser 403, a carbon dioxide storage tank 501, a first liquid pump 601, a second liquid pump 602, a third liquid pump 603, a fourth liquid pump 604, and a blower 605.

[0102] Specifically, flue gas 102 enters the absorption tower 101, and after reacting with the absorbent, the decarbonized flue gas 103 is discharged. The saturated absorbent after absorbing carbon dioxide is discharged through a rich liquid outlet 104 of the absorption tower. The rich phase rich in carbon dioxide, after passing through the first liquid pump 601 and the heat exchanger 401, the heat-exchanged rich liquid is divided into two branches and enters the photo-assisted absorbent regeneration device and the thermal regeneration tower 201 for regeneration.

[0103] Branch 1: The heat-exchanged rich liquid enters the rich liquid inlet 302 of the optical regeneration device for preliminary regeneration. The light energy of the light-assisted absorbent regeneration device comes from the solar energy received and collected by the solar light receiving device 311, and the heat for the reaction comes from the heat energy converted from the light energy by the light directional reflection and absorption device 315. The stirrer 323 stirs to fully mix the rich liquid with the photocatalytic responsive agent 305. The preliminarily regenerated amine liquid is converted into a primary lean-phase absorbent after the reaction in the light-assisted absorbent regeneration device. The primary lean-phase absorbent is discharged through the amine liquid outlet 303 of the optical regeneration device, enters the rich liquid inlet 202 of the thermal regeneration tower through the second liquid pump 602, and is converted into a secondary lean-phase absorbent after the reaction in the thermal regeneration tower 201. The heat for the reaction in the thermal regeneration tower 201 comes from the reboiler 402. The carbon dioxide desorbed by the light-assisted absorbent regeneration device passes through the carbon dioxide outlet 304 of the optical regeneration device, and the carbon dioxide desorbed by the thermal regeneration tower 201 passes through the carbon dioxide outlet 204 of the thermal regeneration tower. The desorbed carbon dioxide carrying water vapor is preliminarily condensed by the wire mesh at the top of the regeneration tower. The two streams of preliminarily condensed carbon dioxide continue to pass through the condenser 403 and enter the carbon dioxide storage tank 501. The condensed water and entrained amine liquid collected by the condenser 403 are returned to the thermal regeneration tower 201 in a jet flow manner through the fourth liquid pump 604 to participate in the thermal desorption. The secondary lean-phase absorbent after the secondary desorption process flows from the bottom of the thermal regeneration tower through the heat exchanger 401, the third liquid pump 603, and into the absorbent tower 101 for reuse, thus completing the first absorbent absorption-regeneration desorption cycle process.

[0104] Branch 2: The heat-exchanged rich liquid passes through the rich liquid inlet 202 of the thermal regeneration tower. The heat for the reaction in the thermal regeneration tower 201 comes from the reboiler 402. The desorbed carbon dioxide carrying water vapor is preliminarily condensed by the wire mesh at the top of the regeneration tower. The condensed carbon dioxide continues to pass through the condenser 403 and enter the carbon dioxide storage tank 501. The condensed water and entrained amine liquid collected by the condenser 403 are returned to the thermal regeneration tower 201 in a jet flow manner through the fourth liquid pump 604 to participate in the desorption. The lean-phase absorbent flows from the bottom of the thermal regeneration tower through the heat exchanger 401, the third liquid pump 603, and into the lean liquid inlet 105 of the absorbent tower for reuse, thus completing the second absorbent absorption-regeneration desorption cycle process.

[0105] Branch 1 and Branch 2 can operate independently, or they can operate simultaneously to achieve the full regeneration of the amine liquid.

[0106] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0107] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the spirit of the design of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A light-assisted absorbent regeneration device, characterized in that, Comprising: The light reaction device cylinder body (321), one side at the top of the light reaction device cylinder body (321) is communicated with the rich liquid inlet (302) of the light regeneration device, the other side at the top of the light reaction device cylinder body (321) is communicated with the carbon dioxide outlet (304) of the light regeneration device, and the bottom of the light reaction device cylinder body (321) is communicated with the amine liquid outlet (303) of the light regeneration device; The solar heat collection device is arranged above the light reaction device cylinder body (321), and the bottom of the solar heat collection device is optically communicated with the light reaction device cylinder body (321); The photocatalytic responder (305) is arranged in the middle of the light reaction device cylinder body (321); The heat storage and circulation device is arranged in the light reaction device cylinder body (321), and the heat storage and circulation device is arranged for heat exchange with the light reaction device cylinder body (321) and the solar heat collection device, and the heat storage and circulation device is used for moving the heat absorbed by the solar heat collection device into the light reaction device cylinder body (321); The solar heat collection device includes: The light collection container (313), a cavity (316) is arranged inside the light collection container (313), a first light transmission device (314) is fixedly connected to the top of the light collection container (313), a second light transmission device (317) is fixedly connected to the bottom, and the light collection container (313) is optically communicated with the light reaction device cylinder body (321) through the second light transmission device (317); The light inlet channel (312) is arranged at the top of the first light transmission device (314), and the bottom of the light inlet channel (312) is optically communicated with the top of the first light transmission device (314); The sunlight receiving device (311) is arranged at the top of the light inlet channel (312), and the bottom of the sunlight receiving device (311) is optically communicated with the top of the light inlet channel (312); The light directional reflection and absorption device (315) is arranged inside the cavity (316), and the light directional reflection and absorption device (315) is used for reflecting the light entering the cavity (316) multiple times and absorbing heat energy; The light directional reflection and absorption device (315) includes a plurality of corrugated plates arranged in parallel, the corrugated plates are made of mirror stainless steel, the plate surfaces of the corrugated plates are in the vertical direction, and a plurality of the corrugated plates are fixed inside the cavity (316), and the light entering the cavity (316) is reflected multiple times and absorbs heat energy by the plurality of corrugated plates; The heat storage and circulation device includes: The heat exchange pipeline (322) is arranged inside the light reaction device cylinder body (321) and exchanges heat with the liquid inside the light reaction device cylinder body (321). The inlet of the heat exchange pipeline (322) is communicated through the fluid circulation pipe outlet (318) and arranged on one side at the bottom of the cavity (316), the outlet of the heat exchange pipeline (322) is communicated with the inlet of a blower (605), and the outlet of the blower (605) is communicated with the other side at the bottom of the cavity (316) through the fluid circulation pipe inlet (319); The stirrer (323) is rotatably arranged at the bottom of the light reaction device cylinder body (321).

2. A carbon dioxide capture system, comprising a carbon dioxide absorption device, a heat exchange device and a carbon dioxide regeneration device which are connected in series, characterized in that: It is also connected to an optical-assisted absorbent regeneration device described in claim 1.

3. A carbon dioxide capture system according to claim 2, characterized in that, The carbon dioxide absorption device includes: An absorption tower (101) into which flue gas (102) enters from a flue gas inlet on one side at the bottom of the absorption tower (101), and the absorption liquid moves downward from top to bottom in the absorption tower (101) to absorb carbon dioxide in the flue gas (102) and convert it into decarbonized flue gas (103). The decarbonized flue gas (103) is discharged from a flue gas outlet at the top of the absorption tower (101), and the absorption liquid is discharged from an absorption tower rich liquid outlet (104) connected to the bottom of the absorption tower (101); A first liquid pump (601) whose inlet is connected to the absorption tower rich liquid outlet (104) through a pipeline, and the outlet pipeline of the first liquid pump (601) is connected to a rich liquid pipeline inlet of a heat exchange device. The rich liquid pipeline outlet of the heat exchange device is connected to the rich liquid inlet of the carbon dioxide regeneration device and the rich liquid inlet (302) of the optical regeneration device; A third liquid pump (603) whose inlet is connected to the lean liquid pipeline outlet of the heat exchange device, the lean liquid pipeline inlet of the heat exchange device is connected to the lean liquid outlet of the carbon dioxide regeneration device, and the outlet of the third liquid pump (603) is connected to an absorption tower lean liquid inlet (105) which is connected and arranged on one side at the top of the absorption tower (101).

4. A carbon dioxide capture system according to claim 3, characterized in that, The heat exchange device includes a heat exchanger (401), a reboiler (402), and a condenser (403); The rich liquid pipeline inlet of the heat exchanger (401) is connected to the outlet of the first liquid pump (601); The rich liquid pipeline outlet of the heat exchanger (401) is connected to the rich liquid inlet of the optical regeneration device (302) and the rich liquid inlet of the carbon dioxide regeneration device; The lean liquid pipeline inlet of the heat exchanger (401) is connected to the lean liquid outlet of the carbon dioxide regeneration device; The lean liquid pipeline outlet of the heat exchanger (401) is connected to the inlet of the third liquid pump (603); The reboiler (402) is connected to one side of the lean liquid outlet of the carbon dioxide regeneration device and is used to provide heat for the reaction in the carbon dioxide regeneration device; The inlet of the condenser (403) is connected to the carbon dioxide outlet (304) of the optical regeneration device and the carbon dioxide outlet of the carbon dioxide regeneration device. The condenser (403) is used to condense the water vapor and absorption liquid in the wet carbon dioxide gas. The condensed carbon dioxide gas is transported into a carbon dioxide storage tank (501) through a pipeline, and the condensate is transported to the inlet of a fourth liquid pump (604) through a pipeline. The outlet of the fourth liquid pump (604) is connected to the absorption tower lean liquid inlet (105) through a pipeline.

5. A carbon dioxide capture system according to claim 4, characterized in that, The carbon dioxide regeneration device includes: The thermal regeneration tower (201), the thermal regeneration tower (201) is communicated with the amine liquid outlet (303) of the optical regeneration device and the rich liquid pipeline outlet of the heat exchanger (401) through the rich liquid inlet (202) of the thermal regeneration tower; the amine liquid outlet (303) of the optical regeneration device is communicated with the inlet of the second liquid pump (602), and the outlet of the second liquid pump (602) is communicated with the rich liquid inlet (202) of the thermal regeneration tower; The top of the thermal regeneration tower (201) is communicated with the inlet of the condenser (403) through the carbon dioxide outlet (204) of the thermal regeneration tower, and the bottom of the thermal regeneration tower (201) is communicated with the lean liquid pipeline inlet of the heat exchanger (401) through the lean liquid outlet (203) of the thermal regeneration tower; The reboiler (402) is thermally exchanged and arranged at the bottom of the thermal regeneration tower (201); The outlet of the fourth liquid pump (604) is communicated with the thermal regeneration tower (201) for the condensate to flow back into the thermal regeneration tower (201) to participate in thermal regeneration.

Images