Carbon dioxide capture device

Abstract

Provided in the present invention is a carbon dioxide capture device, comprising: an absorption tower which is provided with a gas inlet, an exhaust port, an absorption liquid inlet and an absorption liquid outlet; a heat exchanger which is provided with a flue gas inlet, a flue gas outlet and a condensate outlet that are in communication with each other, the flue gas outlet being in communication with the gas inlet; and a cooling assembly which comprises a condensate water tank and a cooling pipe, wherein the cooling pipe runs from outside the absorption tower into the absorption tower and then extends out of the absorption tower, the condensate water tank is provided with a condensate inlet, a water outlet and a first water return port, the condensate outlet being in communication with the condensate inlet, and the cooling pipe is provided with a cooling inlet and a cooling outlet, the water outlet being in communication with the cooling inlet, and the cooling outlet being in communication with the first water return port. The technical solution provided in the present application can solve the problem in the prior art of the absorption reaction being inefficient due to a significant temperature difference between the upper and lower portions of an absorption tower.

Description

Carbon dioxide capture device Technical Field

[0001] The present invention relates to the technical field of carbon dioxide absorption, and in particular to a carbon dioxide capture device. Background Art

[0002] As global warming continues, it has caused great troubles to human production and life, especially CO2, which is the main culprit for rising temperatures. Therefore, in industrial production, the treatment of CO2 before exhaust gas is discharged is crucial.

[0003] In related technologies, the MEA method is a major method for recovering CO2. In an absorption tower, an absorbent is used to absorb the CO2 in the flue gas. In a desorption tower, the solution after absorbing the CO2 is desorbed, and the CO2 product is obtained in a subsequent process.

[0004] However, since the absorption tower is designed according to the absorption load, the tower height can reach 30m~70m. Heat will be released during the CO2 absorption process, resulting in a large temperature difference between the upper and lower parts of the absorption tower, and the absorption reaction cannot be carried out efficiently. Technical issues

[0005] The present invention provides a carbon dioxide capture device to solve the problem in the related art that the temperature difference between the upper and lower parts of the absorption tower is large and the absorption reaction cannot be carried out efficiently. Technical Solutions

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention provides a carbon dioxide capture device, which includes: an absorption tower, having an air inlet, an exhaust port, an absorption liquid inlet and an absorption liquid outlet; a heat exchanger, having a flue gas inlet, a flue gas outlet and a condensation outlet that are connected to each other, and the flue gas outlet is connected to the air inlet; a cooling component, including a condensation water tank and a cooling pipe, the cooling pipe is passed from the outside of the absorption tower to the inside of the absorption tower and passes through the absorption tower, the condensation water tank has a condensation inlet, a water outlet and a first return water port, the condensation outlet is connected to the condensation inlet, the cooling pipe has a cooling inlet and a cooling outlet, the water outlet is connected to the cooling inlet, and the cooling outlet is connected to the first return water port.

[0008] Furthermore, the cooling pipe includes a water inlet pipe, multiple first branch pipes and a return pipe. The cooling inlet is arranged on the water inlet pipe, and the cooling outlet is arranged on the return pipe. The two ends of each first branch pipe are respectively connected to the water inlet pipe and the return pipe. The multiple first branch pipes are arranged from the outside of the absorption tower to the inside of the absorption tower and out of the absorption tower. The multiple first branch pipes are arranged at intervals along the height direction of the absorption tower.

[0009] Furthermore, a plurality of first carriers are provided in the absorption tower, a first buffer filler is provided in the first carrier, the plurality of first carriers are spaced apart along the height direction of the absorption tower, and the plurality of first branch pipes are provided in one-to-one correspondence with the plurality of first carriers.

[0010] Furthermore, a first regulating valve and a cooling pump are provided on the water inlet pipe; and / or a second regulating valve is provided on the first branch pipe. The carbon dioxide capture device also includes a first temperature sensor and a controller. The first temperature sensor is provided on the first carrier, and the controller can control the opening of the second regulating valve according to the temperature detected by the first temperature sensor.

[0011] Furthermore, the first branch pipe includes a first spiral pipe section extending vertically, and the outer wall of the first spiral pipe section is connected to the inner wall of the absorption tower; and / or, multiple first branch pipes are arranged one-to-one above multiple first carriers, or multiple first branch pipes are passed through multiple first carriers one-to-one.

[0012] Furthermore, the heat exchanger also has a first heat exchange inlet, a first heat exchange outlet and a cooling patch that are connected to each other. The carbon dioxide capture device also includes a cooler, which has a cooling inlet and a cooling outlet. The cooling inlet is connected to the first heat exchange outlet, and the cooling outlet is connected to the first heat exchange inlet. The condensed water tank also has a first water replenishment port, and the cooling patch is connected to the first water replenishment port.

[0013] Furthermore, the carbon dioxide capture device also includes a pre-wash tower and an induced draft fan, the pre-wash tower has a pre-wash inlet, a pre-wash outlet, a cleaning port and a drain port, the outlet of the induced draft fan is connected to the pre-wash inlet, the pre-wash outlet is connected to the flue gas inlet, the condensate water tank also has a wash port and a second return water port, the wash port is connected to the cleaning port, and the drain port is connected to the second return water port; and / or, the carbon dioxide capture device also includes a drain pipe, the condensate water tank also has a first drain port, the drain pipe is connected to the first drain port, and a drain valve is provided on the drain pipe.

[0014] Furthermore, the carbon dioxide capture device also includes a desorption tower, a water collecting tank and a heating pipe. The desorption tower has a desorption inlet and a desorption outlet. The desorption inlet is connected to the absorption liquid outlet, and the desorption outlet is connected to the absorption liquid inlet. The heating pipe is passed from the outside of the desorption tower to the inside of the desorption tower and passes out of the desorption tower. The heating pipe has a heating inlet and a heating outlet. The heating inlet is connected to the gas source, and the heating outlet is connected to the water collecting tank.

[0015] Furthermore, the carbon dioxide capture device also includes a temperature reduction and pressure reduction valve, a steam pipe and a flash tank. The flash tank has a first flash inlet and a flash outlet. The two ends of the steam pipe are respectively connected to the gas source and the first flash inlet. The flash outlet is connected to the heating inlet. The temperature reduction and pressure reduction valve is arranged on the steam pipe.

[0016] Furthermore, the carbon dioxide capture device also includes a reboiler, the desorption tower also has a reheat inlet and a reheat outlet, the reboiler has a connected reboiler inlet, a reboiler outlet and a connected second heat exchange inlet, a second heat exchange outlet, the reheat outlet is connected to the reboiler inlet, and the reboiler outlet is connected to the reheat inlet, the temperature and pressure reduction valve has a heating valve port, the flash tank also has a second flash inlet, the second heat exchange inlet is connected to the heating valve port, and the second heat exchange outlet is connected to the second flash inlet; and / or, the water collecting tank also has a water supply outlet, the flash tank has a second water supply port, and the water supply outlet is connected to the second water supply port.

[0017] Furthermore, the heating pipe includes a heating inlet pipe, multiple second branch pipes and a heating outlet pipe. The heating inlet is arranged on the heating inlet pipe, and the heating outlet is arranged on the heating outlet pipe. The two ends of each second branch pipe are respectively connected to the heating inlet pipe and the heating outlet pipe. The multiple second branch pipes are arranged from the outside of the desorption tower to the inside of the desorption tower and pass through the desorption tower. The multiple second branch pipes are arranged at intervals along the height direction of the desorption tower.

[0018] Furthermore, the second branch pipe has a second spiral pipe section extending vertically, and the outer wall of the second spiral pipe section is connected to the inner wall of the desorption tower; and / or, a plurality of second carriers are arranged in the desorption tower, a second buffer filler is arranged in the second carrier, and the plurality of second carriers are arranged at intervals along the height direction of the desorption tower, and the plurality of second branches are arranged in one-to-one correspondence with the plurality of second carriers. Beneficial effects

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The technical solution of the present invention is a carbon dioxide capture device comprising an absorption tower, a heat exchanger, and a cooling assembly. When the absorption tower is operating, a solution containing an absorbent is introduced into the absorption tower through the absorption liquid inlet of the absorption tower. Cooled flue gas, which enters the heat exchanger through the flue gas inlet for heat exchange and is discharged through the flue gas outlet, enters the air inlet of the absorption tower, causing the flue gas and solution to react within the absorption tower, thereby utilizing the absorbent to absorb CO2 from the flue gas. Simultaneously, a cooling pipe is used to transport water from a condensate tank into the absorption tower, and the water in the condensate tank is then used to cool the solution within the absorption tower, thereby reducing the temperature difference between the upper and lower parts of the absorption tower, thereby facilitating the efficient absorption reaction. Furthermore, since the water in the condensate tank is formed from condensed water generated after heat exchange with the flue gas, this effectively utilizes the cold source and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] FIG1 shows a schematic structural diagram of a carbon dioxide capture device according to an embodiment of the present invention.

[0023] The above drawings include the following reference numerals:

[0024] 1. Induced draft fan; 2. Pre-wash tower; 3. Heat exchanger; 4. Cooler; 5. Pre-wash water pump; 6. Condensate tank; 7. Cooling pump; 8. First regulating valve; 9. Second regulating valve; 10. Absorption tower; 11. First temperature sensor; 12. First exhaust pipe; 13. Water inlet pipe; 14. First branch pipe; 15. Return pipe; 16. Second temperature sensor; 17. First drain valve; 18. First water supply valve; 1 9. Lean and rich liquid heat exchanger; 20. Desorption tower; 21. Temperature and pressure reducing valve; 22. Reboiler; 23. Flash tank; 24. Water inlet pump; 25. Main temperature rising valve; 26. Sub-temperature rising valve; 27. Second branch pipe; 28. Third temperature sensor; 29. ​​Water collecting tank; 30. Liquid level sensor; 31. Second water supply valve; 32. Water supply pump; 33. Rich liquid infusion pipe; 34. Second exhaust pipe; 35. Second drain valve. Modes for Carrying Out the Invention

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] As shown in Figure 1, an embodiment of the present invention provides a carbon dioxide capture device, which includes an absorption tower 10, a heat exchanger 3, and a cooling component. The absorption tower 10 has an air inlet, an exhaust port, an absorption liquid inlet, and an absorption liquid outlet; the heat exchanger 3 has a flue gas inlet, a flue gas outlet, and a condensation outlet that are connected to each other, and the flue gas outlet is connected to the air inlet; the cooling component includes a condensation water tank 6 and a cooling pipe, which is passed from the outside of the absorption tower 10 to the inside of the absorption tower 10 and passes through the absorption tower 10. The condensation water tank 6 has a condensation inlet, a water outlet, and a first return water port, and the condensation outlet is connected to the condensation inlet. The cooling pipe has a cooling inlet and a cooling outlet, the water outlet is connected to the cooling inlet, and the cooling outlet is connected to the first return water port.

[0027] Applying the technical solution of the present invention, the carbon dioxide capture device includes an absorption tower 10, a heat exchanger 3, and a cooling component. When the absorption tower 10 is in operation, a solution containing an absorbent is introduced into the absorption tower 10 through the absorption liquid inlet of the absorption tower 10. The cooled flue gas, which enters the heat exchanger 3 through the flue gas inlet for heat exchange and is discharged through the flue gas outlet, enters the air inlet of the absorption tower 10, causing the flue gas and the solution to react within the absorption tower 10, thereby utilizing the absorbent to absorb CO2 in the flue gas. At the same time, a cooling pipe is used to transport water from the condensate tank 6 to the absorption tower 10, and the water in the condensate tank is then used to cool the solution in the absorption tower 10, thereby reducing the temperature difference between the upper and lower parts of the absorption tower 10, thereby facilitating the efficient absorption reaction. Furthermore, since the water in the condensate tank 6 is formed from condensed water generated after the flue gas heat exchange, it effectively utilizes the cold source and saves costs.

[0028] In the related art, the absorption tower 10 adopts a natural cooling method using an intermediate cooling water tank. This cooling method is inefficient and cannot ensure the temperature at different heights in the absorption tower.

[0029] In this embodiment, after the power plant flue gas is heat exchanged in the heat exchanger 3, the temperatures of the cooling water and the condensed water generated by the flue gas are relatively low. The temperatures of the cooling water and the condensed water after heat exchange with the flue gas are both between 25°C and 35°C, while the reaction temperature in the absorption tower 10 is as high as 35°C to 52°C, and there is cooling capacity that can be used for cooling between the stages of the absorption tower 10.

[0030] As shown in FIG1 , the cooling pipe includes an inlet pipe 13, multiple first branch pipes 14, and a return pipe 15. The cooling inlet is provided on the inlet pipe 13, and the cooling outlet is provided on the return pipe 15. The two ends of each first branch pipe 14 are respectively connected to the inlet pipe 13 and the return pipe 15. The multiple first branch pipes 14 are provided from the outside of the absorption tower 10 into the absorption tower 10 and then pass out of the absorption tower 10. The multiple first branch pipes 14 are spaced apart along the height direction of the absorption tower 10. With the cooling pipe structure described above, the multiple first branch pipes 14 are used to cool the absorption tower 10, thereby ensuring the temperature at different heights within the absorption tower 10, so that the absorption reaction has a suitable temperature.

[0031] In this embodiment, cooled flue gas enters the absorption tower 10 from the bottom, and a solution containing an absorbent enters the absorption tower 10 from the top. The flue gas and the absorbent come into contact in reverse, absorbing the CO2 in the flue gas. The decarbonized flue gas is then discharged from the top of the absorption tower 10 through the first exhaust pipe 12. By disposing multiple first branch pipes 14 at intervals along the height of the absorption tower 10, temperatures suitable for the absorption reaction can be maintained at different heights.

[0032] As shown in Figure 1, absorption tower 10 is provided with a plurality of first carriers, each of which contains a first buffer filler. The first carriers are spaced apart along the height of absorption tower 10, and a plurality of first branch pipes 14 are provided in a one-to-one correspondence with the first carriers. The first buffer filler can slow the flow of the solution containing the absorbent, ensuring sufficient contact between the absorbent and the CO2, thereby achieving a good absorption effect.

[0033] In this embodiment, since the reaction area between the absorbent and CO2 is mainly concentrated in the first buffer filler of the first carrier, the first branch pipe 14 is set corresponding to the first carrier, which can timely cool the solution after the reaction to make the solution temperature suitable for the reaction.

[0034] As shown in FIG1 , a first regulating valve 8 and a cooling pump 7 are provided on the water inlet pipe 13 . The cooling pump 7 can circulate the condensed water in the condensed water tank 6 , and the first regulating valve 8 can regulate the flow of the condensed water in the water inlet pipe 13 .

[0035] In this embodiment, a second regulating valve 9 is provided on the first branch pipe 14. The carbon dioxide capture device also includes a first temperature sensor 11 and a controller. The first temperature sensor 11 is provided on the first carrier. The controller controls the opening of the second regulating valve 9 based on the temperature detected by the first temperature sensor 11. The first temperature sensor 11 can detect the temperature of the solution at the first carrier. By adjusting the opening of the second regulating valve 9, the flow rate in the first branch pipe 14 can be adjusted to control the cooling rate of the solution and maintain the solution at an appropriate temperature.

[0036] As shown in FIG1 , the first branch pipe 14 includes a first spiral pipe section extending vertically, the outer wall of which is connected to the inner wall of the absorption tower 10 . The first spiral pipe section can increase the heat exchange area with the solution while ensuring strength.

[0037] The plurality of first branch pipes 14 are disposed above the plurality of first carriers in a one-to-one correspondence, or the plurality of first branch pipes 14 are passed through the plurality of first carriers in a one-to-one correspondence.

[0038] As shown in Figure 1, heat exchanger 3 further comprises a first heat exchange inlet, a first heat exchange outlet, and a cooling fill port. The CO2 capture device further comprises a cooler 4, which comprises a cooling inlet and a cooling outlet. The cooling inlet is connected to the first heat exchange outlet, and the cooling outlet is connected to the first heat exchange inlet. Condensate tank 6 further comprises a first water fill port, which is connected to the first water fill port. Cooler 4 forms a cold source to cool the flue gas passing through heat exchanger 3. Furthermore, the cooling water in cooler 4 provides a supplemental water source for condensate tank 6, maintaining an appropriate water level.

[0039] The carbon dioxide capture device further includes a drain pipe, and the condensed water tank 6 further includes a first drain port. The drain pipe is connected to the first drain port and is provided with a first drain valve 17. By opening the first drain valve 17, the water in the condensed water tank 6 can be drained through the drain pipe.

[0040] It should be noted that the condensed water tank 6 is equipped with a second temperature sensor 16. When the water temperature in the condensed water tank 6 is between 20°C and 30°C, the first drain valve 17 is opened to drain the water, and the first water replenishment valve 18 is opened to use the circulating cooling water after heat exchange as supplemental cooling to replenish the condensed water tank 6. When the temperature is low or the temperature and liquid level are appropriate, the first drain valve 17 and the first water replenishment valve 18 are closed.

[0041] As shown in Figure 1, the carbon dioxide capture device also includes a pre-wash tower 2 and an induced draft fan 1. The pre-wash tower 2 has a pre-wash inlet, a pre-wash outlet, a cleaning port and a drain port. The outlet of the induced draft fan 1 is connected to the pre-wash inlet, and the pre-wash outlet is connected to the flue gas inlet. The condensate tank 6 also has a wash port and a second return water port. The wash port is connected to the cleaning port, and the drain port is connected to the second return water port. The induced draft fan 1 can be used to guide the flue gas from the power plant into the pre-wash tower 2 to flush the flue gas and remove dust in the flue gas.

[0042] In this embodiment, the condensed water in the condensed water tank 6 is pumped into the pre-wash tower 2 via the pre-wash water pump 5 to wash the flue gas in the pre-wash tower 2 .

[0043] As shown in Figure 1, the carbon dioxide capture device also includes a desorption tower 20, a water collection tank 29, and a heating pipe. The desorption tower 20 has a desorption inlet and a desorption outlet, the desorption inlet is connected to the absorption liquid outlet, and the desorption outlet is connected to the absorption liquid inlet. The heating pipe is installed from the outside of the desorption tower 20 into the desorption tower 20 and passes through the desorption tower 20. The heating pipe has a heating inlet and a heating outlet, the heating inlet is connected to the gas source, and the heating outlet is connected to the water collection tank 29. The desorption tower 20 can be used to desorb the saturated rich liquid after absorbing CO2 to release the CO2.

[0044] In this embodiment, the desorption inlet of the desorption tower 20 is located at the top of the desorption tower 20, and the desorption outlet is located at the bottom of the desorption tower 20. The saturated rich liquid falls from the top of the desorption tower 20 to the bottom of the tower by gravity. Since the saturated rich liquid undergoes a desorption reaction in the desorption tower 20 to release CO2, this process is accompanied by an endothermic reaction, causing the temperature of the solution to gradually decrease as it flows in the tower. This causes uneven temperature in the desorption tower 20, which affects the desorption effect of the solution.

[0045] The gas source is a power plant gas source. The power plant gas source is introduced into the desorption tower 20 to serve as a heat source to heat the saturated rich liquid in the desorption tower 20, so that the saturated rich liquid has a suitable temperature for the desorption reaction. The heated gas source enters the water collection tank 29 for collection.

[0046] As shown in Figure 1, the CO2 capture device also includes a desuperheating and pressure-reducing valve 21, a steam pipe, and a flash tank 23. Flash tank 23 has a first flash inlet and a flash outlet. The steam pipe's two ends are connected to the gas source and the first flash inlet, respectively, while the flash outlet is connected to the heating inlet. Desuperheating and pressure-reducing valve 21 is mounted on the steam pipe. The steam pipe transports power plant steam to desuperheating and pressure-reducing valve 21, where it is then cooled. The rapid depressurization of flash tank 23 generates high-temperature saturated water, which is then pumped into desorption tower 20 via inlet pump 24.

[0047] In this embodiment, the steam temperature of the power plant boiler can usually reach about 200°C~350°C. The steam can be cooled and decompressed by the temperature-reducing and pressure-reducing valve 21 and the flash tank 23, so that the steam temperature is reduced to about 100°C~150°C, and the waste heat is used to heat the saturated rich liquid in the desorption tower 20.

[0048] As shown in Figure 1, the carbon dioxide capture device also includes a reboiler 22. The desorption tower 20 also has a reheat inlet and a reheat outlet. The reboiler 22 has a connected reboiler inlet, a reboiler outlet, and a connected second heat exchange inlet and a second heat exchange outlet. The reheat outlet is connected to the reboiler inlet, and the reboiler outlet is connected to the reheat inlet. The temperature reduction and pressure reduction valve 21 has a heating valve port. The flash tank 23 also has a second flash inlet, the second heat exchange inlet is connected to the heating valve port, and the second heat exchange outlet is connected to the second flash inlet. The reboiler 22 can be used to heat the saturated rich liquid again to release CO2. After the reaction, the saturated rich liquid becomes a lean liquid containing absorbent and returns to the bottom of the desorption tower 20. The desorbed CO2 is discharged through the second exhaust pipe 34 at the top of the desorption tower 20.

[0049] In this embodiment, the high-temperature steam passing through the temperature-reducing and pressure-reducing valve 21 enters the reboiler 22, and the saturated rich liquid entering the reboiler 22 is heated by the steam after temperature reduction and pressure reduction to release CO2.

[0050] The water collecting tank 29 also has a water replenishment outlet, and the flash tank 23 has a second water replenishment port, and the water replenishment outlet is connected to the second water replenishment port. By transferring the water in the water collecting tank 29 to the flash tank 23, water can be reused.

[0051] In this embodiment, the water collection tank 29 is equipped with a liquid level sensor 30. When the liquid level is high, the second drain valve 35 is opened to drain the water, or the second water replenishment valve 31 and the water replenishment pump 32 are opened to pump the water into the flash tank 23. After heat exchange, the cooling water still contains heat that can be recycled and reused. It can be used as reserve water for secondary waste heat recovery or as conventional circulating cooling water, thus reducing resource waste.

[0052] As shown in FIG1 , the heating pipe includes a heating inlet pipe, a plurality of second branch pipes 27, and a heating outlet pipe. The heating inlet is provided at the heating inlet pipe, and the heating outlet is provided at the heating outlet pipe. The two ends of each second branch pipe 27 are respectively connected to the heating inlet pipe and the heating outlet pipe. The plurality of second branch pipes 27 are provided from the outside of the desorption tower 20 to the inside of the desorption tower 20 and pass through the desorption tower 20. The plurality of second branch pipes 27 are spaced apart along the height direction of the desorption tower 20. The heating pipe with the above structure uses the plurality of second branch pipes 27 to cool the desorption tower 20, thereby ensuring the temperature at different heights within the desorption tower 20, so that the CO2 release reaction has a suitable temperature.

[0053] In this embodiment, since the saturated rich liquid flows from top to bottom, by arranging a plurality of second branch pipes 27 at intervals along the height direction of the desorption tower 20, temperatures suitable for the absorption reaction can be set at different heights.

[0054] The heating inlet pipe is provided with a main temperature-raising valve 25 to adjust the flow rate of the heating inlet pipe, and the second branch pipe 27 is provided with a sub-temperature-raising valve 26 to adjust the flow rate of the second branch pipe 27.

[0055] As shown in FIG1 , the second branch pipe 27 has a second spiral pipe section extending vertically, the outer wall of which is connected to the inner wall of the desorption tower 20 . The second spiral pipe section can increase the heat exchange area with the solution while ensuring strength.

[0056] The desorption tower 20 is provided with a plurality of second carriers, each of which is provided with a second buffer filler. The plurality of second carriers are spaced apart along the height of the desorption tower 20, and the plurality of second branch pipes 27 are provided in a one-to-one correspondence with the plurality of second carriers. The second buffer filler can slow the flow rate of the saturated rich solution, increase the reaction time of the solution within the second carriers, and simultaneously achieve thermal insulation and heating of the solution within the tower, thereby improving the desorption efficiency of the initial stage of the desorption tower and enabling the saturated rich solution to release CO2.

[0057] Specifically, a third temperature sensor 28 is provided on the second carrier, and the third temperature sensor can detect the temperature of the second carrier. The opening of the temperature-increasing valve 26 is adjusted according to the temperature detected by the third temperature sensor.

[0058] In this embodiment, the plurality of second branch pipes 27 are disposed above the plurality of second carriers in a one-to-one correspondence, or the plurality of second branch pipes 27 are disposed through the plurality of second carriers in a one-to-one correspondence.

[0059] Among them, the carbon dioxide capture device also includes a lean and rich liquid heat exchanger 19. The saturated rich liquid that absorbs CO2 in the absorption tower 10 is heated by the lean and rich liquid heat exchanger 19 and enters the desorption tower 20 through the rich liquid infusion pipe 33. The lean liquid after CO2 is precipitated in the desorption tower 20 is cooled in the lean and rich liquid heat exchanger 19 and then enters the absorption tower 10. The saturated rich liquid and the lean liquid exchange heat in the lean and rich liquid heat exchanger 19.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0062] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0065] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A carbon dioxide capture device, characterized in that: The carbon dioxide capture device comprises: An absorption tower (10) having an air inlet, an exhaust port, an absorption liquid inlet, and an absorption liquid outlet; A heat exchanger (3) having a flue gas inlet, a flue gas outlet, and a condensation outlet connected to each other, wherein the flue gas outlet is connected to the air inlet; A cooling component comprises a condensation water tank (6) and a cooling pipe, wherein the cooling pipe is passed from the outside of the absorption tower (10) into the absorption tower (10) and passes out of the absorption tower (10), the condensation water tank (6) has a condensation inlet, a water outlet and a first water return port, the condensation outlet is connected to the condensation inlet, the cooling pipe has a cooling inlet and a cooling outlet, the water outlet is connected to the cooling inlet, and the cooling outlet is connected to the first water return port.

2. The carbon dioxide capture device according to claim 1, characterized in that The cooling pipe comprises a water inlet pipe (13), a plurality of first branch pipes (14) and a return pipe (15); the cooling inlet is arranged on the water inlet pipe (13); the cooling outlet is arranged on the return pipe (15); both ends of each first branch pipe (14) are respectively connected to the water inlet pipe (13) and the return pipe (15); the plurality of first branch pipes (14) are passed from the outside of the absorption tower (10) into the absorption tower (10) and pass out of the absorption tower (10); the plurality of first branch pipes (14) are arranged at intervals along the height direction of the absorption tower (10).

3. The carbon dioxide capture device according to claim 2, characterized in that A plurality of first carriers are provided in the absorption tower (10), a first buffer filler is provided in the first carriers, the plurality of first carriers are spaced apart along the height direction of the absorption tower (10), and the plurality of first branch pipes (14) are provided in a one-to-one correspondence with the plurality of first carriers.

4. The carbon dioxide capture device according to claim 3, characterized in that The water inlet pipe (13) is provided with a first regulating valve (8) and a cooling pump (7); and / or, A second regulating valve (9) is provided on the first branch pipe (14). The carbon dioxide capture device further comprises a first temperature sensor (11) and a controller. The first temperature sensor (11) is provided on the first carrier. The controller is capable of controlling the opening of the second regulating valve (9) according to the temperature detected by the first temperature sensor (11).

5. The carbon dioxide capture device according to claim 3, characterized in that The first branch pipe (14) comprises a first spiral pipe section extending vertically, the outer wall of the first spiral pipe section being connected to the inner wall of the absorption tower (10); and / or, The plurality of first branch pipes (14) are arranged one-to-one above the plurality of first carriers, or the plurality of first branch pipes (14) are passed through the plurality of first carriers one-to-one.

6. The carbon dioxide capture device according to claim 1, characterized in that The heat exchanger (3) further comprises a first heat exchange inlet, a first heat exchange outlet and a cooling patch which are connected to each other. The carbon dioxide capture device further comprises a cooler (4). The cooler (4) comprises a cooling inlet and a cooling outlet. The cooling inlet is connected to the first heat exchange outlet, and the cooling outlet is connected to the first heat exchange inlet. The condensed water tank (6) further comprises a first water replenishment port, and the cooling patch is connected to the first water replenishment port.

7. The carbon dioxide capture device according to claim 1, characterized in that The carbon dioxide capture device further comprises a pre-wash tower (2) and an induced draft fan (1), the pre-wash tower (2) having a pre-wash inlet, a pre-wash outlet, a cleaning outlet and a water discharge outlet, the outlet of the induced draft fan (1) is connected to the pre-wash inlet, the pre-wash outlet is connected to the flue gas inlet, the condensed water tank (6) further comprises a water wash outlet and a second water return outlet, the water wash outlet is connected to the cleaning outlet, and the water discharge outlet is connected to the second water return outlet; and / or, The carbon dioxide capture device further comprises a drain pipe, the condensed water tank (6) further comprises a first drain port, the drain pipe is in communication with the first drain port, and a first drain valve (17) is provided on the drain pipe.

8. The carbon dioxide capture device according to any one of claims 1 to 7, characterized in that The carbon dioxide capture device further comprises a desorption tower (20), a water collecting tank (29) and a heating pipe, wherein the desorption tower (20) has a desorption inlet and a desorption outlet, wherein the desorption inlet is communicated with the absorption liquid outlet, and the desorption outlet is communicated with the absorption liquid inlet, and the heating pipe is passed from the outside of the desorption tower (20) into the desorption tower (20) and out of the desorption tower (20), wherein the heating pipe has a heating inlet and a heating outlet, wherein the heating inlet is communicated with a gas source, and the heating outlet is communicated with the water collecting tank (29).

9. The carbon dioxide capture device according to claim 8, characterized in that The carbon dioxide capture device further comprises a temperature-reducing and pressure-reducing valve (21), a steam pipe and a flash tank (23), wherein the flash tank (23) has a first flash inlet and a flash outlet, the two ends of the steam pipe are respectively connected to the gas source and the first flash inlet, the flash outlet is connected to the heating inlet, and the temperature-reducing and pressure-reducing valve (21) is arranged on the steam pipe.

10. The carbon dioxide capture device according to claim 9, characterized in that The carbon dioxide capture device further comprises a reboiler (22), the desorption tower (20) further comprises a reheat inlet and a reheat outlet, the reboiler (22) comprises a reboiler inlet and a reboiler outlet, and a second heat exchange inlet and a second heat exchange outlet which are connected to each other, the reheat outlet is connected to the reboiler inlet, and the reboiler outlet is connected to the reheat inlet, the temperature reduction and pressure reduction valve (21) comprises a heating valve port, the flash tank (23) further comprises a second flash inlet, the second heat exchange inlet is connected to the heating valve port, and the second heat exchange outlet is connected to the second flash inlet; and / or the water collecting tank (29) further comprises a water replenishment outlet, the flash tank (23) comprises a second water replenishment port, and the water replenishment outlet is connected to the second water replenishment port.

11. The carbon dioxide capture device according to claim 8, characterized in that The heating pipe includes a heating inlet pipe, a plurality of second branch pipes (27) and a heating outlet pipe, the heating inlet is arranged at the heating inlet pipe, the heating outlet is arranged at the heating outlet pipe, the two ends of each second branch pipe (27) are respectively connected to the heating inlet pipe and the heating outlet pipe, the plurality of second branch pipes (27) are passed from the outside of the desorption tower (20) into the desorption tower (20) and pass out of the desorption tower (20), and the plurality of second branch pipes (27) are arranged at intervals along the height direction of the desorption tower (20).

12. The carbon dioxide capture device according to claim 11, characterized in that The second branch pipe (27) has a second spiral pipe section extending vertically, and the outer wall of the second spiral pipe section is connected to the inner wall of the desorption tower (20); and / or, A plurality of second carriers are provided in the desorption tower (20), a second buffer filler is provided in the second carrier, the plurality of second carriers are spaced apart along the height direction of the desorption tower (20), and the plurality of second branch pipes (27) are provided in a one-to-one correspondence with the plurality of second carriers.

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