Carbon dioxide capture device

Abstract

The present disclosure provides a carbon dioxide capture device. The carbon dioxide capture device comprises: a dehydration column, wherein a drying agent for drying flue gas is provided in the dehydration column, the dehydration column is provided with a dehydration inlet and a dehydration outlet that are communicated with each other, and the dehydration inlet is communicated with a gas source; an absorption assembly provided with a gas inlet and a gas outlet that are communicated with each other, and an absorption liquid inlet and an absorption liquid outlet that are communicated with each other, wherein the gas inlet is communicated with the dehydration outlet, and the gas outlet is communicated with the outside; a regeneration column provided with an exhaust port, and a regeneration inlet and a regeneration outlet that are communicated with each other, wherein the regeneration inlet is communicated with the absorption liquid outlet, and the regeneration outlet is communicated with the absorption liquid inlet; and a heater provided with a heating inlet and a heating outlet, wherein the heating inlet is communicated with the gas source, and the heating outlet is communicated with the dehydration outlet. The technical solution provided in the present disclosure can solve the problem in the related art that a rich liquid after absorbing carbon dioxide does not undergo phase separation.

Description

Carbon dioxide capture device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority from Chinese Patent Application No. 202410839803.X filed on June 26, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of carbon dioxide absorption, in particular to a carbon dioxide capture device. BACKGROUND

[0004] With the global warming, it has caused great trouble to human production and life, especially CO2 is the main culprit of rising temperature. Therefore, in industrial production, the treatment of CO2 before exhaust gas emission is very important.

[0005] In the related art, the phase change type chemical absorption method is a main technical means for recycling CO2. The carbon capture system includes an absorption assembly and a regeneration tower. By introducing flue gas into the absorption assembly, the CO2 in the flue gas is absorbed by the absorbent. The solution after absorbing CO2 is desorbed in the regeneration tower, and CO2 product is obtained in the subsequent process.

[0006] However, due to the high moisture content in the flue gas, as the running time increases, the moisture in the flue gas enters the absorbent solution, and the gradual increase of moisture in the phase change system will cause the water balance in the system to be broken, so that the phase separation does not occur. SUMMARY

[0007] The present disclosure provides a carbon dioxide capture device to solve the problem that the rich liquid after absorbing carbon dioxide in the related art does not occur phase separation.

[0008] The present disclosure provides a carbon dioxide capture device, which includes a dehydration tower, a drying agent for drying flue gas is arranged in the dehydration tower, the dehydration tower has a dehydration inlet and a dehydration outlet connected in communication, the dehydration inlet is communicated with a gas source; an absorption assembly has a gas inlet and a gas outlet connected in communication and an absorption liquid inlet and an absorption liquid outlet connected in communication, the gas inlet is communicated with the dehydration outlet, and the gas outlet is communicated with the outside; a regeneration tower has an exhaust port and a regeneration inlet and a regeneration outlet connected in communication, the regeneration inlet is communicated with the absorption liquid outlet, and the regeneration outlet is communicated with the absorption liquid inlet; a heater has a heating inlet and a heating outlet, the heating inlet is communicated with the gas source, and the heating outlet is communicated with the dehydration outlet.

[0009] In some embodiments, the carbon dioxide capturing device further comprises a cooler having a cooling inlet and a cooling outlet in communication, and a separator having a separation inlet, the cooling inlet being in communication with the dehydration inlet, and the cooling outlet being in communication with the separation inlet.

[0010] In some embodiments, the cooler further comprises a heat exchange inlet and a heat exchange outlet in communication, the heat exchange inlet being in communication with the absorption liquid outlet, and the heat exchange outlet being in communication with the regeneration inlet.

[0011] In some embodiments, the carbon dioxide capturing device further comprises a pre-washing tower having a pre-washing condensing inlet, and a flue gas inlet and a flue gas outlet in communication, the flue gas inlet being in communication with the gas source, and the dehydration inlet being in communication with the flue gas outlet, the separator further having a separation outlet, and a reflux pipe in communication with the separation outlet, an outlet of the reflux pipe being in communication with the pre-washing condensing inlet.

[0012] In some embodiments, the carbon dioxide capturing device further comprises a water washing tower having a water washing condensing inlet, and a decarbonated gas inlet and a decarbonated gas outlet in communication, the decarbonated gas inlet being in communication with the gas outlet, and the decarbonated gas outlet being in communication with the outside, the separator further having a separation outlet, and a reflux pipe in communication with the separation outlet, an outlet of the reflux pipe being in communication with the water washing condensing inlet.

[0013] In some embodiments, the carbon dioxide capturing device further comprises a water storage tank, the water storage tank being arranged on the reflux pipe.

[0014] In some embodiments, the dehydration tower is three, the dehydration outlet of each dehydration tower being in communication with the heating outlet and the gas inlet respectively, the dehydration inlet of each dehydration tower being in communication with the gas source and the cooling inlet respectively, and a closing valve being arranged on the communication pipeline between the dehydration outlet and the heating outlet, the communication pipeline between the dehydration outlet and the gas inlet, the communication pipeline between the dehydration inlet and the gas source, and the communication pipeline between the dehydration inlet and the cooling inlet.

[0015] In some embodiments, the absorption assembly comprises an absorption tower and a phase separator in communication, the gas inlet, the gas outlet, and the absorption liquid inlet being arranged in the absorption tower, and the absorption liquid outlet being arranged in the phase separator.

[0016] In some embodiments, the carbon dioxide capturing device further comprises a lean-rich liquid heat exchanger having a rich liquid inlet and a rich liquid outlet in communication, and a lean liquid inlet and a lean liquid outlet in communication, the rich liquid inlet being in communication with the absorption liquid outlet, the rich liquid outlet being in communication with the regeneration inlet, the lean liquid inlet being in communication with the regeneration outlet, and the lean liquid outlet being in communication with the absorption liquid inlet.

[0017] In some embodiments, the carbon dioxide capturing device further comprises a reboiler having a reboiling inlet and a reboiling outlet in communication, and a temperature rising inlet and a temperature rising outlet in communication, the reboiling outlet being in communication with the regeneration inlet, the regeneration outlet being in communication with the reboiling inlet, and the temperature rising inlet being in communication with the heat source.

[0018] By applying the technical solution of the present disclosure, the carbon dioxide capturing device comprises a dehydration tower, an absorption assembly, a regeneration tower and a heater. Flue gas is transported into the dehydration tower from the dehydration inlet of the dehydration tower, and the flue gas is dried by using the drying agent. The dried flue gas enters the absorption assembly through the dehydration outlet and the gas inlet. The carbon dioxide in the flue gas is absorbed by the absorbent in the absorption assembly to form rich liquid. The flue gas after removing the carbon dioxide is discharged from the gas outlet. The rich liquid enters the regeneration tower through the absorption liquid outlet and the regeneration inlet of the regeneration tower. The rich liquid is heated and desorbed in the regeneration tower. The desorbed carbon dioxide is discharged from the exhaust port. The rich liquid is converted into lean liquid containing the absorbent. The lean liquid returns to the absorption assembly through the regeneration outlet and the absorption liquid inlet. Moreover, the heater can heat the flue gas. The heated flue gas can enter the dehydration tower through the dehydration outlet to dry the drying agent that absorbs water, so that the drying agent can be recycled. Since the water in the flue gas is dried by the drying agent in the dehydration tower, the water content in the flue gas is reduced, so that the flue gas can enter the absorption assembly without affecting the water balance of the system, and phase separation can occur smoothly. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of the present disclosure serve to provide a further understanding of the present disclosure, and the illustrative embodiments of the present disclosure and their descriptions serve to explain the present disclosure, and do not constitute improper limitations on the present disclosure. In the drawings:

[0020] FIG. 1 shows a structural schematic diagram of a carbon dioxide capturing device according to an embodiment of the present disclosure.

[0021] Among them, the above drawings include the following reference signs: 10, dehydration tower; 11, closing valve; 20, absorption assembly; 21, absorption tower; 22, phase separator; 30, regeneration tower; 40, heater; 50, cooler; 60, separator; 70, pre-washing tower; 80, water washing tower; 90, water storage tank; 100, lean and rich liquid heat exchanger; 110, reboiler. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present disclosure.

[0023] As shown in FIG. 1, the carbon dioxide capture device provided by the embodiment of the present disclosure includes a dehydration tower 10, an absorption assembly 20, a regeneration tower 30, and a heater 40. The dehydration tower 10 is provided with a drying agent for drying flue gas. The dehydration tower 10 has a dehydration inlet and a dehydration outlet connected in communication. The dehydration inlet is in communication with a gas source. The absorption assembly 20 has an air inlet and an air outlet connected in communication, and an absorption liquid inlet and an absorption liquid outlet connected in communication. The air inlet is in communication with the dehydration outlet. The air outlet is in communication with the outside. The regeneration tower 30 has an exhaust port, and a regeneration inlet and a regeneration outlet connected in communication. The regeneration inlet is in communication with the absorption liquid outlet. The regeneration outlet is in communication with the absorption liquid inlet. The heater 40 has a heating inlet and a heating outlet. The heating inlet is in communication with the gas source. The heating outlet is in communication with the dehydration outlet.

[0024] By using the technical solution of the present disclosure, the carbon dioxide capture device includes the dehydration tower 10, the absorption assembly 20, the regeneration tower 30, and the heater 40. The flue gas is transported from the dehydration inlet of the dehydration tower 10 into the dehydration tower 10. The drying agent is used to dry the flue gas. The dried flue gas enters the absorption assembly 20 through the dehydration outlet and the air inlet. The absorbent in the absorption assembly 20 is used to absorb the carbon dioxide in the flue gas and form a rich liquid. The flue gas after the removal of carbon dioxide is discharged from the air outlet. The rich liquid enters the regeneration tower 30 through the absorption liquid outlet and the regeneration inlet of the regeneration tower 30 after phase separation. The rich liquid is desorbed in the regeneration tower 30. The desorbed carbon dioxide is discharged from the exhaust port. The rich liquid is converted into a lean liquid containing the absorbent. The lean liquid returns to the absorption assembly 20 through the regeneration outlet and the absorption liquid inlet. In addition, the heater 40 can be used to heat the flue gas. The heated flue gas can enter the dehydration tower 10 through the dehydration outlet to dry the drying agent that absorbs water, so that the drying agent can be recycled. Since the water in the flue gas is dried by the drying agent in the dehydration tower 10, the water content in the flue gas is reduced, so that the flue gas can enter the absorption assembly 20 without affecting the water balance of the system, and phase separation can be successfully performed.

[0025] As shown in FIG. 1, the carbon dioxide capture device further includes a cooler 50 and a separator 60. The cooler 50 has a cooling inlet and a cooling outlet connected in communication. The separator 60 has a separation inlet. The cooling inlet is in communication with the dehydration inlet. The cooling outlet is in communication with the separation inlet. The flue gas after regeneration heat blowing enters the cooler 50 through the dehydration inlet. The cooler 50 can be used to cool the high-temperature flue gas to separate gas and water in the separator 60.

[0026] As shown in FIG. 1, the cooler 50 further comprises a heat exchange inlet and a heat exchange outlet in communication, the heat exchange inlet is in communication with the absorption liquid outlet, and the heat exchange outlet is in communication with the regeneration inlet. The flue gas after the regeneration heat blowing contains a large amount of moisture, which needs to be cooled to separate the moisture. The flue gas after the regeneration heat blowing is sent into the cooler 50, and the low-temperature rich liquid (40-50°C) from the absorption liquid outlet is used to cool it, so as to separate the moisture in the flue gas after the regeneration heat blowing. At the same time, the low-temperature rich liquid from the absorption liquid outlet also uses the heat in the flue gas after the regeneration heat blowing, and the heated rich liquid is sent into the regeneration tower for heating and regeneration, thereby reducing the regeneration energy consumption.

[0027] Specifically, the flue gas after the regeneration heat blowing enters the cooler 50 through the dehydration inlet and the cooling inlet, and the rich liquid enters the cooler 50 through the absorption liquid outlet and the heat exchange inlet. The flue gas heats the rich liquid, and the heated rich liquid is transported into the regeneration tower 30.

[0028] As shown in FIG. 1, the carbon dioxide capture device further comprises a prewashing tower 70, the prewashing tower 70 has a prewashing condensing inlet and a flue gas inlet and a flue gas outlet in communication, the flue gas inlet is in communication with the gas source, the dehydration inlet is in communication with the flue gas outlet, and the separator 60 further has a separation outlet and a reflux pipe in communication with the separation outlet, and the outlet of the reflux pipe is in communication with the prewashing condensing inlet. The prewashing tower 70 can be used to wash the flue gas containing carbon dioxide to purify the flue gas. The condensed water separated in the separator 60 can enter the prewashing tower 70 through the separation outlet, the reflux pipe and the prewashing condensing inlet, so as to provide a water source for the prewashing tower 70 and recycle the condensed water.

[0029] As shown in FIG. 1, the carbon dioxide capture device further comprises a water washing tower 80, the water washing tower 80 has a water washing condensing inlet and a decarburized gas inlet and a decarburized gas outlet in communication, the decarburized gas inlet is in communication with the gas outlet, and the decarburized gas outlet is in communication with the outside, and the separator 60 further has a separation outlet and a reflux pipe in communication with the separation outlet, and the outlet of the reflux pipe is in communication with the water washing condensing inlet. The water washing tower 80 can be used to wash the flue gas after decarburization to make the flue gas meet the emission requirements. The condensed water separated in the separator 60 can enter the water washing tower 80 through the separation outlet, the reflux pipe and the water washing condensing inlet, so as to provide a water source for the water washing tower 80 and recycle the condensed water.

[0030] As shown in FIG. 1, the carbon dioxide capture device further comprises a water storage tank 90, which is arranged on the reflux pipe. The water storage tank 90 can be used to recycle and store the condensed water in the separator 60 for further use.

[0031] As shown in Figure 1, the dehydration tower 10 is three, each dehydration outlet of the dehydration tower 10 is communicated with the heating outlet and the gas inlet respectively, each dehydration inlet of the dehydration tower 10 is communicated with the gas source and the cooling inlet respectively, the communication pipeline of the dehydration outlet and the heating outlet, the communication pipeline of the dehydration outlet and the gas inlet, the communication pipeline of the dehydration inlet and the gas source, the communication pipeline of the dehydration inlet and the cooling inlet are all provided with a closing valve 11. By setting three dehydration towers 10, the first dehydration tower 10 dries the flue gas, the second dehydration tower 10 dries the desiccant that absorbs moisture, and the third dehydration tower 10 cools the dried desiccant. To realize the circulation work of the dehydration tower 10, so that the flue gas can be dried all the time.

[0032] Specifically, the flue gas containing carbon dioxide enters the first dehydration tower 10 through the dehydration inlet, and the flue gas is dried by the desiccant in the first dehydration tower 10, and the dried flue gas is introduced into the absorption assembly 20 through the dehydration outlet and the gas inlet for carbon dioxide adsorption. At the same time, the flue gas containing carbon dioxide is heated by the heater 40, and the heated flue gas enters the second dehydration tower 10 through the dehydration outlet, and the high-temperature flue gas is used to dry the desiccant that absorbs moisture, and the dried flue gas enters the cooler 50 through the dehydration inlet and the cooling inlet, and the rich liquid enters the cooler 50 through the absorption liquid outlet and the heat exchange inlet, and the flue gas heats the rich liquid. At this time, the flue gas containing carbon dioxide enters the third dehydration tower 10 through the dehydration inlet, and the flue gas is used to cool the dried desiccant, so that the desiccant can be reused, and the cooled flue gas is introduced into the absorption assembly 20 through the dehydration outlet and the gas inlet for carbon dioxide adsorption.

[0033] As shown in Figure 1, the absorption assembly 20 includes an absorption tower 21 and a phase separator 22 in communication, the gas inlet, the gas outlet and the absorption liquid inlet are provided in the absorption tower 21, and the absorption liquid outlet is provided in the phase separator 22. The absorption tower 21 can be used to absorb carbon dioxide in the flue gas, and enter the phase separator 22 for phase separation, and then enter the regeneration tower 30.

[0034] In this embodiment, the absorbent is arranged in the absorption tower 21, and the rich liquid after absorbing carbon dioxide is phase-separated in the phase separator 22.

[0035] As shown in Figure 1, the carbon dioxide capture device further includes a lean-rich liquid heat exchanger 100, the lean-rich liquid heat exchanger 100 has a rich liquid inlet and a rich liquid outlet in communication and a lean liquid inlet and a lean liquid outlet in communication, the rich liquid inlet is communicated with the absorption liquid outlet, the rich liquid outlet is communicated with the regeneration inlet, the lean liquid inlet is communicated with the regeneration outlet, and the lean liquid outlet is communicated with the absorption liquid inlet. By using the lean-rich liquid heat exchanger 100, the low-temperature rich liquid and the high-temperature lean liquid can be heat-exchanged to reduce the system energy consumption.

[0036] As shown in Fig. 1, the carbon dioxide capturing device further comprises a reboiler 110, the reboiler 110 has a reboil inlet and a reboil outlet connected in communication and a temperature rising inlet and a temperature rising outlet connected in communication, the reboil outlet is connected with the regeneration inlet, the regeneration outlet is connected with the reboil inlet, and the temperature rising inlet is connected with a heat source. The reboiler 110 can be used to reheat the rich liquid in the regeneration tower 30, so that the carbon dioxide can be quickly precipitated from the rich liquid.

[0037] In the present embodiment, since the temperature of the lean liquid and the rich liquid is different, and in the absorption tower 21, the gas inlet is arranged at the lower end of the absorption tower 21, and the gas outlet is arranged at the upper end of the absorption tower 21, the flue gas is in contact with the absorbent and is adsorbed during the ascending process in the absorption tower 21, and the temperature gradually decreases. In the regeneration tower 30, the regeneration inlet is arranged at the upper part of the regeneration tower 30, and the regeneration outlet is arranged at the bottom of the regeneration tower 30, the rich liquid descends in the regeneration tower 30, and the carbon dioxide is precipitated, and the temperature gradually increases.

[0038] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0039] The relative arrangement of components and steps, the numerical expressions, and numerical values set forth in the examples are not meant to limit the scope of the present disclosure unless otherwise specifically indicated. It is to be understood that the use of the terms "including", "comprising", or "having" in the detailed description or the claims means "including by way of non-limiting example" such that the phrasing "A and / or B" means "A and / or B and / or A and B" and so forth.

[0040] In the description of the present disclosure, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or positional relationship are generally based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the protection scope of the present disclosure; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0041] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0042] In addition, it should be noted that the use of the words "first", "second" and the like to qualify parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the protection scope of the present disclosure.

[0043] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A carbon dioxide capture device, wherein the carbon dioxide capture device comprises: A dehydration tower (10) is provided with a desiccant for drying flue gas. The dehydration tower (10) has a dehydration inlet and a dehydration outlet connected together. The dehydration inlet is connected to a gas source. The absorption assembly (20) has an air inlet and an air outlet connected together, as well as an absorbent liquid inlet and an absorbent liquid outlet connected together. The air inlet is connected to the dehydration outlet, and the air outlet is connected to the outside. The regeneration tower (30) has an exhaust port and a regeneration inlet and a regeneration outlet connected together, the regeneration inlet being connected to the absorbent outlet and the regeneration outlet being connected to the absorbent inlet; The heater (40) has a heating inlet and a heating outlet, the heating inlet being connected to the gas source and the heating outlet being connected to the dehydration outlet.

2. The carbon dioxide capture device according to claim 1, wherein the carbon dioxide capture device further comprises a cooler (50) and a separator (60), the cooler (50) having a cooling inlet and a cooling outlet connected in communication, the separator (60) having a separation inlet, the cooling inlet being connected to the dehydration inlet, and the cooling outlet being connected to the separation inlet.

3. The carbon dioxide capture device according to claim 2, characterized in that, The cooler (50) also includes a heat exchange inlet and a heat exchange outlet connected together. The heat exchange inlet is connected to the absorbent outlet, and the heat exchange outlet is connected to the regeneration inlet.

4. The carbon dioxide capture device according to claim 2 or 3, wherein the carbon dioxide capture device further comprises a pre-washing tower (70), the pre-washing tower (70) having a pre-washing condensation inlet and a flue gas inlet and a flue gas outlet connected thereto, the flue gas inlet being connected to the gas source, the dehydration inlet being connected to the flue gas outlet, and the separator (60) further having a separation outlet and a reflux pipe connected to the separation outlet, the outlet of the reflux pipe being connected to the pre-washing condensation inlet.

5. The carbon dioxide capture device according to any one of claims 2 to 4, wherein the carbon dioxide capture device further comprises a water washing tower (80), the water washing tower (80) having a water washing condensation inlet and a decarbonized gas inlet and a decarbonized gas outlet connected thereto, the decarbonized gas inlet being connected to the gas outlet, the decarbonized gas outlet being connected to the outside, the separator (60) further having a separation outlet and a reflux pipe connected to the separation outlet, the outlet of the reflux pipe being connected to the water washing condensation inlet.

6. The carbon dioxide capture device according to claim 4 or 5, characterized in that, The carbon dioxide capture device also includes a water storage tank (90), which is disposed on the return pipe.

7. The carbon dioxide capture device according to any one of claims 2 to 6, wherein there are three dehydration towers (10), the dehydration outlet of each dehydration tower (10) is connected to the heating outlet and the air inlet respectively, the dehydration inlet of each dehydration tower (10) is connected to the gas source and the cooling inlet respectively, and a shut-off valve (11) is provided on the connecting pipe between the dehydration outlet and the heating outlet, the connecting pipe between the dehydration outlet and the air inlet, the connecting pipe between the dehydration inlet and the gas source, and the connecting pipe between the dehydration inlet and the cooling inlet.

8. The carbon dioxide capture device according to any one of claims 1 to 7, wherein the absorption assembly (20) comprises an absorption tower (21) and a phase separator (22) connected in series, the air inlet, the air outlet and the absorbent inlet are disposed in the absorption tower (21), and the absorbent outlet is disposed in the phase separator (22).

9. The carbon dioxide capture device according to any one of claims 1 to 8, wherein the carbon dioxide capture device further comprises a lean-rich liquid heat exchanger (100), the lean-rich liquid heat exchanger (100) having a rich liquid inlet and a rich liquid outlet connected together, and a lean liquid inlet and a lean liquid outlet connected together, the rich liquid inlet being connected to the absorbent outlet, the rich liquid outlet being connected to the regeneration inlet, the lean liquid inlet being connected to the regeneration outlet, and the lean liquid outlet being connected to the absorbent inlet.

10. The carbon dioxide capture device according to any one of claims 1 to 9, wherein the carbon dioxide capture device further comprises a reboiler (110), the reboiler (110) having a reboiler inlet and a reboiler outlet connected in communication, and a heating inlet and a heating outlet connected in communication, the reboiler outlet being connected to the regeneration inlet, the regeneration outlet being connected to the reboiler inlet, and the heating inlet being connected to a heat source.

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