A carbon capture system

Abstract

The utility model provides a kind of carbon capture system, comprising: absorption tower, for receiving processing gas, inside spray for with processing gas and the absorbent solution of reaction;And at least one inner oxygen removal system.The inner oxygen removal system includes: inner absorbent oxygen removal tank, is connected with absorption tower by solution receiving pipe, for receiving the absorbent solution after reaction in absorption tower with processing gas and carries out oxygen removal treatment;And inner solution pump, with inner absorbent oxygen removal tank intercommunication, for the absorbent solution in inner absorbent oxygen removal tank after oxygen removal treatment is driven to absorption tower, to react with processing gas again.The scheme is helpful to reduce the oxygen content in absorbent solution, to reduce the oxidation degradation reaction of absorbent solution in carbon capture process.

Description

Technical Field

[0001] This utility model relates to the field of carbon capture technology, and in particular to a carbon capture system. Background Technology

[0002] Carbon capture is the process of capturing carbon dioxide from gases and then storing or utilizing it, with the aim of reducing carbon dioxide emissions. Common carbon capture systems are mainly used in the treatment of industrial flue gas. The general process flow is as follows: pretreated flue gas is fed into an absorption tower through a flue, where the absorbent reacts with the carbon dioxide in the flue gas. The rich absorbent solution, having absorbed the carbon dioxide, is then sent to a regeneration tower, where it is heated to release carbon dioxide, which is then subsequently stored or utilized. The lean absorbent solution, after releasing the carbon dioxide, is returned to the absorption tower for recycling.

[0003] However, during the reaction between the absorbent and flue gas inside the absorption tower, a certain amount of oxygen dissolves into the absorbent. Since the entire carbon capture process takes place at high temperatures, this oxygen reacts with the absorbent, causing oxidative degradation and reducing its ability to absorb carbon dioxide, thus shortening its effective cycle life. This is one of the reasons for the high cost of carbon capture absorbents. Utility Model Content

[0004] One objective of this invention is to provide a carbon capture system capable of solving any of the aforementioned problems.

[0005] Specifically, this invention provides a carbon capture system, comprising: An absorption tower for receiving treated gases, with an absorbent solution sprayed inside to react with the treated gases; and At least one internal deoxygenation system, the internal deoxygenation system comprising: An internal absorbent deoxygenation tank, connected to the absorption tower via a solution receiving pipe, is used to receive the absorbent solution after reaction with the treated gas in the absorption tower and to perform deoxygenation treatment; and An internal solution pump, connected to the internal absorbent deoxygenation tank, is used to drive the deoxygenated absorbent solution in the internal absorbent deoxygenation tank to the absorption tower, where it reacts with the treated gas.

[0006] Optionally, each of the said internal deoxygenation systems further includes: An internally connected gas-lifting storage tank is connected to the internally connected absorbent deoxygenation tank via a gas-lifting gas delivery pipe, thereby supplying gas-lifting gas to the absorbent solution in the internally connected absorbent deoxygenation tank to extract oxygen from the absorbent solution in the internally connected absorbent deoxygenation tank using the gas-lifting gas; and The internal gas stripping purification tank is connected to the internal absorbent deoxygenation tank via a gas receiving pipe and to the internal gas stripping storage tank via a gas output pipe. It receives the mixed gas containing gas stripping gas flowing out of the internal absorbent deoxygenation tank and transports the gas purified by the gas stripping gas to the internal gas stripping storage tank.

[0007] Optionally, the internal absorbent deoxygenator is provided with a first partition plate, thereby dividing the internal space of the internal absorbent deoxygenator into a first space and a second space. A first communication area is provided between the first partition plate and the inner bottom wall of the internal absorbent deoxygenation tank, so that the first space and the second space are connected. The connection between the solution receiving pipe and the internal absorbent deoxygenation tank is located on the top wall of the first space, and the connection between the gas receiving pipe and the internal absorbent deoxygenation tank is located on the top wall of the second space. The gas lift-off gas delivery pipe extends into the second space to deliver gas lift-off gas to the absorbent solution located in the second space, and the gas lift-off gas output position in the second space is higher than the highest point of the first connecting area.

[0008] Optionally, the internal absorbent deoxygenation tank is further provided with a second partition plate, which is disposed in the second space and arranged opposite to the first partition plate, thereby dividing the second space into two parts: one part located on the side of the second partition plate facing the first partition plate and the other part located on the side away from the first partition plate. A second communication area is provided between the second partition plate and the inner top wall of the internal absorbent deoxygenation tank, so that the portions of the second space located on both sides of the second partition plate are connected. The air extraction outlet in the second space is located between the first partition plate and the second partition plate; The connection point between the internal solution pump and the internal absorbent deoxygenation tank is located on the side of the second partition plate away from the first partition plate.

[0009] Optionally, a return gas pipe is also provided between the absorption tower and the internal absorbent deoxygenation tank. The connection between the return gas pipe and the internal absorbent deoxygenation tank is located on the top wall of the first space. The return gas pipe is used to return a portion of the gas carried by the absorbent solution from the absorption tower back to the absorption tower.

[0010] Optionally, a demisting device is provided at the top of the second space, so that the gas in the internal absorbent deoxygenation tank passes through the demisting device before flowing to the gas receiving pipe.

[0011] Optionally, the carbon capture system also includes: A cooling pool is located outside the absorption tower; There is a height difference between the internal absorbent deoxygenation tank and the internal solution pump. The internal solution pump is used to drive the deoxygenated absorbent solution in the internal absorbent deoxygenation tank to flow through the cooling pool and be cooled before being transported to the absorption tower.

[0012] Optionally, the carbon capture system also includes: A desorption tower is used to receive an absorbent solution after reacting with the treated gas to desorb the carbon dioxide absorbed in the absorbent solution; and An external deoxygenation system, the external deoxygenation system comprising: An external absorbent deoxygenation tank, connected to the absorption tower, is used to receive the absorbent solution after reaction with the treated gas in the absorption tower and to perform deoxygenation treatment; and An external solution pump, connected to the external absorbent deoxygenation tank, is used to transport the deoxygenated absorbent solution to the desorption tower.

[0013] Optionally, the external deoxygenation system further includes: An external gas extraction storage tank is connected to the external absorbent deoxygenation tank, thereby supplying gas extraction gas to the absorbent solution in the external absorbent deoxygenation tank to extract oxygen gas from the absorbent solution in the external absorbent deoxygenation tank; and An external gas stripping purification tank is connected to the external absorbent deoxygenation tank and the external gas stripping storage tank, respectively, so as to receive the mixed gas containing gas stripping gas flowing out from the external absorbent deoxygenation tank, and transport the gas after gas stripping purification treatment to the external gas stripping storage tank.

[0014] Optionally, the carbon capture system also includes: The lean-rich liquid heat exchanger is connected to the external absorbent deoxygenation tank via a first input pipe and to the desorption tower via a first output pipe, thereby receiving the absorbent solution after gas stripping treatment and conveying it to the desorption tower. It is also connected to the desorption tower via a second input pipe and to the absorption tower via a second output pipe, thereby receiving the absorbent solution after desorption treatment and conveying it to the absorption tower, and enabling heat exchange between the absorbent solution after gas stripping treatment and the absorbent solution after desorption treatment.

[0015] This novel carbon capture system incorporates an internal absorbent deoxygenation tank connected to an absorption tower. This tank receives the absorbent solution after reaction with the treated gas within the absorption tower and deoxygenates it. The deoxygenated absorbent solution is then pumped back into the absorption tower via an internal solution pump, where it reacts with the treated gas again. This process helps reduce the oxygen content of the absorbent solution in the absorption tower and also reduces the oxygen content in the absorbent solution sent to the desorption tower. This mitigates the oxidative degradation reactions of the absorbent solution within the absorption tower, as well as during its flow to and desorption from the desorption tower. This allows the absorbent solution to maintain a higher carbon dioxide absorption capacity over a longer period, extending its effective cycle life and reducing the frequency of replacement and operating costs. Furthermore, it helps reduce the oxygen impurity content in the carbon dioxide product gas produced by the desorption tower, paving the way for the application of carbon dioxide products.

[0016] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0017] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic diagram of a carbon capture system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of an internal deoxygenation system in a carbon capture system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of an internal absorbent deoxygenator in a carbon capture system according to an embodiment of the present invention; Figure 4 This is a partial schematic diagram of a carbon capture system according to another embodiment of the present invention. Detailed Implementation

[0018] Those skilled in the art should understand that the embodiments described below are merely some embodiments of the present invention, and not all embodiments of the present invention. These embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0019] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] like Figure 1 As shown, in one embodiment, the carbon capture system includes an absorption tower 100, a desorption tower 200, and a lean-rich liquid heat exchanger 300. The absorption tower 100 receives the gas to be processed and sprays an absorbent solution inside to react with the gas. The desorption tower 200 receives the absorbent solution after reaction with the gas to desorb carbon dioxide absorbed in the absorbent solution. The lean-rich liquid heat exchanger 300 facilitates heat exchange between the absorbent solution after reaction with the gas flowing from the absorption tower 100 to the desorption tower 200 and the desorbed absorbent solution flowing from the desorption tower 200 to the absorption tower 100.

[0022] Reference Figure 1As shown, specifically, the absorption tower 100 is equipped with a spraying device for spraying the absorbent solution. When the treated gas, such as pretreated flue gas, enters the absorption tower 100, it reacts with the absorbent solution sprayed inside the absorption tower 100, thereby absorbing carbon dioxide from the treated gas. The absorbent solution that has reacted with the treated gas is finally transported to the desorption tower 200. In the desorption tower 200, the carbon dioxide absorbed by the absorbent solution is desorbed. The desorbed absorbent solution is then transported back to the absorption tower 100 to continue reacting with the treated gas, thus achieving the recycling of the absorbent solution.

[0023] Compared to the absorbent solution that reacts with the treated gas and flows from absorption tower 100 to desorption tower 200, the absorbent solution that has undergone desorption treatment and flows from desorption tower 200 to absorption tower 100 has a higher temperature. Therefore, the two solutions can exchange heat through the lean-rich liquid heat exchanger 300. Heating the absorbent solution flowing to desorption tower 200 to a certain extent helps to improve the subsequent desorption efficiency.

[0024] like Figure 1 and Figure 2 As shown, the carbon capture system also includes two interconnected deoxygenation systems 400. Each interconnected deoxygenation system 400 includes an interconnected absorbent deoxygenation tank 410 and an interconnected solution pump 420. The interconnected absorbent deoxygenation tank 410 is connected to the absorption tower 100 via a solution receiving pipe 401, and is used to receive the absorbent solution after reaction with the treated gas in the absorption tower 100 and perform deoxygenation treatment. The interconnected solution pump 420 is connected to the interconnected absorbent deoxygenation tank 410, and is used to drive the deoxygenated absorbent solution in the interconnected absorbent deoxygenation tank 410 into the absorption tower 100, so that it can react with the treated gas again.

[0025] Specifically, in the absorption tower 100, in addition to a general absorbent solution recovery tank at the bottom, liquid collection structures can also be installed at a certain height within the absorption tower 100, meaning the liquid collection structures are higher than the recovery tank. These liquid collection structures collect a portion of the absorbent solution falling from above, while allowing some absorbent solution to continue falling downwards. For example, the liquid collection structures can be multiple spaced-apart collection tanks. An internal absorbent deoxygenation tank 410 receives the absorbent solution collected by the liquid collection structures.

[0026] After being deoxygenated in the internal absorbent deoxygenation tank 410, the absorbent solution is driven to the absorption tower 100 by the internal solution pump 420. In other words, it is sprayed back into the absorption tower 100.

[0027] In this embodiment, an internal absorbent deoxygenation tank 410 connected to the absorption tower 100 is provided. This tank receives the absorbent solution after reaction with the treated gas within the absorption tower 100 and performs deoxygenation treatment. Then, the deoxygenated absorbent solution from the internal absorbent deoxygenation tank 410 is pumped back into the absorption tower 100 via an internal solution pump 420, where it reacts with the treated gas again. This helps reduce the oxygen content of the absorbent solution in the absorption tower 100. Simultaneously, it also helps reduce the oxygen content of the absorbent solution sent to the desorption tower 200. This mitigates the oxidative degradation reactions of the absorbent solution within the absorption tower 100, as well as the oxidative degradation reactions occurring during the flow to and desorption of the absorbent solution within the desorption tower 200. This allows the absorbent solution to maintain a better carbon dioxide absorption capacity for a longer period, helping to extend the effective cycle life of the absorbent solution, thereby reducing the replacement frequency and lowering the usage cost of the absorbent solution. At the same time, it also helps to reduce the oxygen impurity content in the carbon dioxide product gas produced by the desorption tower 200, paving the way for the application of carbon dioxide products.

[0028] It should be noted that in some other embodiments, the number of internal deoxygenation systems may be one, three or more.

[0029] like Figure 1 and Figure 2 As shown, in one embodiment, each internal deoxygenation system 400 further includes an internal stripped gas storage tank 430 and an internal stripped gas purification tank 440. The internal stripped gas storage tank 430 is connected to the internal absorbent deoxygenation tank 410 via a stripped gas delivery pipe 402, thereby supplying stripped gas to the absorbent solution in the internal absorbent deoxygenation tank 410 to extract oxygen from the absorbent solution within the internal absorbent deoxygenation tank 410. The internal stripped gas purification tank 440 is connected to the internal absorbent deoxygenation tank 410 via a gas receiving pipe 403 and to the internal stripped gas storage tank 430 via a gas output pipe 404, thereby receiving the mixed gas containing stripped gas flowing out of the internal absorbent deoxygenation tank 410 and conveying the purified gas to the internal stripped gas storage tank 430.

[0030] Reference Figure 1 and Figure 2As shown, specifically, the stripped gas (such as nitrogen) in the internal stripped gas storage tank 430 is transported to the absorbent solution in the internal absorbent deoxygenation tank 410 via the stripped gas delivery pipe 402, thereby extracting dissolved oxygen from the absorbent solution through stripping. The mixed gas containing the stripped gas then flows into the internal stripped gas purification tank 440 via the gas receiving pipe 403. In the internal stripped gas purification tank 440, the mixed gas undergoes stripped gas purification treatment. Specifically, during the stripping treatment of the absorbent solution, in addition to oxygen, a portion of carbon dioxide is also stripped. In one embodiment, the internal stripped gas purification tank 440 can be used to remove oxygen from the mixed gas. Or in another embodiment, the internal stripped gas purification tank 440 can be used to remove carbon dioxide from the mixed gas. The purified gas is then transported to the internal stripped gas storage tank 430, thereby realizing the recycling of the stripped gas.

[0031] By setting up an internally connected gas stripping storage tank 430 and an internally connected gas stripping purification tank 440, the gas stripping gas (such as nitrogen) in the internally connected gas stripping storage tank 430 is transported to the absorbent solution in the internally connected absorbent deoxygenation tank 410 via the gas stripping gas delivery pipe 402, thereby extracting dissolved oxygen from the absorbent solution using a gas stripping method. The gas stripping method is less likely to generate impurities in the absorbent solution, helping to ensure the quality of the absorbent solution.

[0032] It should be noted that in some other embodiments, the internal gas extraction storage tank and the internal gas extraction purification tank may not be provided. Instead, a solid deoxygenating agent may be directly provided in the internal absorbent deoxygenation tank to achieve deoxygenation treatment of the absorbent solution.

[0033] Additionally, it should be noted that the internal gas extraction and purification tank 440 can utilize a solution to perform gas extraction and purification treatment on the gas from the gas receiving pipe 403, such as using a solution that covers the connection between the gas receiving pipe 403 and the internal gas extraction and purification tank 440. Alternatively, it can utilize a solid reagent to perform gas extraction and purification treatment on the gas from the gas receiving pipe 403.

[0034] Furthermore, the gas from the internal gas extraction and purification tank 440 can be further purified within the internal gas extraction and purification tank 430. This can be achieved by placing a solid reagent for gas extraction and purification within the internal gas extraction and purification tank 430, or by filling the internal gas extraction and purification tank 430 with a solution that covers the connection point between the gas output pipe 404 and the internal gas extraction and purification tank 430. For example, carbon dioxide can be removed from the mixed gas containing the extracted gas first within the internal gas extraction and purification tank 440, and then oxygen can be removed from the mixed gas containing the extracted gas within the internal gas extraction and purification tank 430.

[0035] like Figures 1 to 3As shown, in one embodiment, the internal absorbent deoxygenator 410 is provided with a first partition plate 411, thereby dividing the internal space of the internal absorbent deoxygenator 410 into a first space 4101 and a second space 4102. A first communication area is provided between the first partition plate 411 and the inner bottom wall of the internal absorbent deoxygenator 410, so that the first space 4101 and the second space 4102 are connected. The solution receiving pipe 401 is connected to the internal absorbent deoxygenator 410 at the top wall of the first space 4101. The gas receiving pipe 403 is connected to the internal absorbent deoxygenator 410 at the top wall of the second space 4102. The gas lifting gas delivery pipe 402 extends into the second space 4102 to deliver gas lifting gas to the absorbent solution located in the second space 4102, and the gas lifting gas output position in the second space 4102 is higher than the highest point of the first communication area.

[0036] Reference Figures 1 to 3 As shown, specifically, the first partition plate 411 is in sealed contact with the inner top wall and inner side wall of the internal absorbent deoxygenation tank 410, and the bottom side of the first partition plate 411 is spaced from the inner bottom wall of the internal absorbent deoxygenation tank 410, thereby forming a first communicating region. The absorbent solution entering the first space 4101 from the top wall of the first space 4101 enters the second space 4102 from the first communicating region.

[0037] The gas lifting gas delivery pipe 402 delivers gas lifting gas into the second space 4102. After the gas lifting gas lifts the absorbent solution, it rises and flows together with the lifted oxygen, flows out from the top wall of the second space 4102 and connects to the absorbent deoxygenator 410, and enters the gas receiving pipe 403.

[0038] By setting the first partition plate 411, the stripped gas and oxygen in the second space 4102 are blocked by the first partition plate 411. On the one hand, this helps to prevent the stripped gas and oxygen from entering the first space 4101 and then flowing into the absorption tower 100. On the other hand, it allows some of the stripped gas and oxygen to collide with the first partition plate 411 during their upward flow, thereby blocking the liquid carried by the gas and reducing the liquid entrained in the gas entering the gas receiving pipe 403.

[0039] like Figures 1 to 3As shown, the internal absorbent deoxygenator 410 is further provided with a second partition plate 412. The second partition plate 412 is disposed within the second space 4102 and is arranged opposite to the first partition plate 411, thereby dividing the second space 4102 into two parts: one on the side of the second partition plate 412 facing the first partition plate 411 and the other on the side facing away from the first partition plate 411. A second communication area is provided between the second partition plate 412 and the inner top wall of the internal absorbent deoxygenator 410, so that the portions of the second space 4102 located on both sides of the second partition plate 412 are connected. The gas lift-out position within the second space 4102 is located between the first partition plate 411 and the second partition plate 412.

[0040] Reference Figures 1 to 3 As shown, the second partition plate 412 is in sealed contact with the inner bottom wall and inner side wall of the internal absorbent deoxygenation tank 410, and the top side of the second partition plate 412 is spaced from the inner top wall of the internal absorbent deoxygenation tank 410, thereby forming a second connecting region. The absorbent solution entering the first space 4101 from the top wall of the first space 4101 enters the portion of the second space 4102 located between the first partition plate 411 and the second partition plate 412 from the first connecting region, and then enters the portion of the second space 4102 located on the side of the second partition plate 412 opposite to the first partition plate 411 from the second connecting region.

[0041] The connection point between the internal solution pump 420 and the internal absorbent deoxygenation tank 410 is located on the side of the second partition plate 412 away from the first partition plate 411, and is located at the bottom of the side wall or bottom wall of the internal absorbent deoxygenation tank 410.

[0042] The air extraction outlet in the second space 4102 is located between the first partition plate 411 and the second partition plate 412. That is, the air extraction delivery pipe 402 extends into the second space 4102 between the first partition plate 411 and the second partition plate 412.

[0043] In this embodiment, by providing a first partition plate 411 and a second partition plate 412 inside the internal absorbent deoxygenator 410, a first communication area is provided between the first partition plate 411 and the inner bottom wall of the internal absorbent deoxygenator 410, and a second communication area is provided between the second partition plate 412 and the inner top wall of the internal absorbent deoxygenator 410, a tortuous flow channel is formed inside the internal absorbent deoxygenator 410, which prolongs the flow path of the absorbent solution, which is beneficial to increasing the reaction time between the gas-lifted gas and the absorbent solution, thereby obtaining a more complete oxygen-lifting effect.

[0044] like Figures 1 to 3As shown, a demisting device 413 is installed at the top of the second space 4102, so that the gas lifter in the internal absorbent deoxygenation tank 410 passes through the demisting device 413 before flowing to the gas receiving pipe 403. Specifically, the demisting device 413 divides the second space 4102 into upper and lower parts, with the gas lifter output position located in the lower part. This ensures that the gas lifter and the extracted oxygen must pass through the demisting device 413 before flowing to the gas receiving pipe 403, thereby removing absorbent droplets carried in the gas and reducing absorbent waste.

[0045] like Figures 1 to 3 As shown, a return gas pipe 405 is also provided between the absorption tower 100 and the internal absorbent deoxygenation tank 410. The connection between the return gas pipe 405 and the internal absorbent deoxygenation tank 410 is located on the top wall of the first space 4101. The return gas pipe 405 is used to return a portion of the gas carried by the absorbent solution from the absorption tower 100 back to the absorption tower 100. Specifically, the treated gas in the absorption tower 100 enters the internal absorbent deoxygenation tank 410 along with the absorbent solution. Then, the return gas pipe 405 can be used to draw the treated gas that has entered the internal absorbent deoxygenation tank 410 back into the absorption tower 100. Moreover, because of the presence of the first partition plate 411, the return gas pipe 405 will not draw away the gas stripping gas, and the gas receiving pipe 403 will not draw away the treated gas, which helps to avoid waste of gas stripping gas and avoid contamination of the gas stripping gas.

[0046] Although not shown in the figure, in one embodiment, the first partition plate and / or the second partition plate are plate-like structures that zigzag along the longitudinal direction, such as wavy plate-like structures or sawtooth plate-like structures. The above-mentioned structure helps to increase the probability of collision between the gas and the first partition plate and the second partition plate during the upward flow of the gas lifter, thereby blocking the liquid carried by the gas and reducing the liquid entrained in the gas entering the gas receiving pipe.

[0047] like Figure 1 As shown, in one embodiment, the carbon capture system further includes an external deoxygenation system. The external deoxygenation system includes an external absorbent deoxygenation tank 510 and an external solution pump 520. The external absorbent deoxygenation tank 510 is connected to the absorption tower 100 and is used to receive the absorbent solution after reaction with the treated gas in the absorption tower 100 and perform deoxygenation treatment. The external solution pump 520 is connected to the external absorbent deoxygenation tank 510 and is used to transport the deoxygenated absorbent solution to the desorption tower 200.

[0048] Specifically, the lean-rich liquid heat exchanger 300 is connected to the external absorbent deoxygenation tank 510 via a first input pipe and to the desorption tower 200 via a first output pipe, thereby receiving the absorbent solution after stripping gas treatment and conveying it to the desorption tower 200. It is also connected to the desorption tower 200 via a second input pipe and to the absorption tower 100 via a second output pipe, thereby receiving the desorbed absorbent solution and conveying it to the absorption tower 100. This allows for heat exchange between the stripped absorbent solution and the desorbed absorbent solution. In other words, the deoxygenated absorbent solution in the external absorbent deoxygenation tank 510 first flows through the lean-rich liquid heat exchanger 300 and then into the desorption tower 200. The absorbent solution output from the desorption tower 200 first flows through the lean-rich liquid heat exchanger 300 and then into the absorption tower 100.

[0049] In addition, the external deoxygenation system also includes an external stripped gas storage tank 530 and an external stripped gas purification tank 540. The external stripped gas storage tank 530 is connected to the external absorbent deoxygenation tank 510, thereby supplying stripped gas to the absorbent solution in the external absorbent deoxygenation tank 510 to extract oxygen from the absorbent solution. The external stripped gas purification tank 540 is connected to both the external absorbent deoxygenation tank 510 and the external stripped gas storage tank 530, thereby receiving the mixed gas containing stripped gas flowing out of the external absorbent deoxygenation tank 510 and transporting the purified gas to the external stripped gas storage tank 530.

[0050] Specifically, the external deoxygenation system's structure and operation are the same as the internal deoxygenation system 400 described above, and will not be repeated here. The difference lies in that the deoxygenated absorbent solution in the internal absorbent deoxygenation tank 410 is transported back to the absorption tower 100, while the deoxygenated absorbent solution in the external absorbent deoxygenation tank 510 is transported to the desorption tower 200.

[0051] In this embodiment, by setting up an external deoxygenation system, the absorbent solution is deoxygenated as it flows from the absorber tower 100 to the desorption tower 200, thereby further reducing the oxygen content in the absorbent solution flowing into the desorption tower 200. This significantly reduces the oxidative degradation reactions occurring in the absorbent solution during its flow to and from the desorption tower 200, and during desorption within the desorption tower 200. This allows the absorbent solution to maintain a good carbon dioxide absorption capacity for a longer period, helping to extend its effective cycle life and further reduce the frequency of absorbent solution replacement, thus lowering the cost of using the absorbent solution.

[0052] It should be noted that in some other embodiments, the external absorbent deoxygenation tank and the desorption tower can be directly connected, allowing the absorbent solution after gas stripping to be directly transported to the desorption tower. That is, a lean-rich solution heat exchanger is not installed. In other words, the external absorbent deoxygenation tank and the desorption tower are directly or indirectly connected to transport the absorbent solution after gas stripping to the desorption tower.

[0053] like Figure 4 As shown, in one embodiment, the carbon capture system further includes a cooling pool 600. The cooling pool 600 is located outside the absorption tower 100. There is a height difference between the internal absorbent deoxygenation tank 410 and the internal solution pump 420. The internal solution pump 420 is used to drive the deoxygenated absorbent solution in the internal absorbent deoxygenation tank 410 to flow through the cooling pool 600 to be cooled and then transported into the absorption tower 100.

[0054] like Figure 4 As shown, specifically, a cooling pool 600 is located on the bottom side of the absorption tower 100. The cooling pool 600 contains coolant. An internal solution pump 420 is located next to the cooling pool 600, and has a height difference from the connected internal absorbent deoxygenation tank 410.

[0055] In this embodiment, a cooling tank 600 is provided, and an internal solution pump 420 drives the deoxygenated absorbent solution in the internal absorbent deoxygenator tank 410 to flow through the cooling tank 600 for cooling before being transported to the absorption tower 100. The cooled absorbent solution can improve the reaction efficiency with the treated gas. Furthermore, there is a height difference between the internal absorbent deoxygenator tank 410 and the internal solution pump 420, so that the pressure difference between the internal solution pump 420 and its corresponding counterpart can be used to supplement the power of the internal solution pump 420 to supply liquid to a higher position, thereby helping to reduce the head required for the solution pump to supply liquid to a higher position and reducing the cost of the solution pump to a certain extent.

[0056] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A carbon capture system, characterized in that, include: An absorption tower is used to receive and process gases, and its interior is sprayed with an absorbent solution to react with the gas. and At least one internal deoxygenation system, the internal deoxygenation system comprising: An internal absorbent deoxygenation tank is connected to the absorption tower via a solution receiving pipe. It is used to receive the absorbent solution that has reacted with the gas being treated in the absorption tower and to perform deoxygenation treatment. and An internal solution pump, connected to the internal absorbent deoxygenation tank, is used to drive the deoxygenated absorbent solution in the internal absorbent deoxygenation tank to the absorption tower, where it reacts with the treated gas.

2. The carbon capture system according to claim 1, characterized in that... Each of the aforementioned internal deoxygenation systems also includes: An internally connected gas-lifting storage tank is connected to the internally connected absorbent deoxygenation tank via a gas-lifting gas delivery pipe, thereby supplying gas-lifting gas to the absorbent solution in the internally connected absorbent deoxygenation tank to extract oxygen from the absorbent solution in the internally connected absorbent deoxygenation tank using the gas-lifting gas; and The internal gas stripping purification tank is connected to the internal absorbent deoxygenation tank via a gas receiving pipe and to the internal gas stripping storage tank via a gas output pipe. It receives the mixed gas containing gas stripping gas flowing out of the internal absorbent deoxygenation tank and transports the gas purified by the gas stripping gas to the internal gas stripping storage tank.

3. The carbon capture system according to claim 2, characterized in that... The internal absorbent deoxygenator is provided with a first partition plate, thereby dividing the internal space of the internal absorbent deoxygenator into a first space and a second space. A first communication area is provided between the first partition plate and the inner bottom wall of the internal absorbent deoxygenation tank, so that the first space and the second space are connected. The connection between the solution receiving pipe and the internal absorbent deoxygenation tank is located on the top wall of the first space, and the connection between the gas receiving pipe and the internal absorbent deoxygenation tank is located on the top wall of the second space. The gas lift-off gas delivery pipe extends into the second space to deliver gas lift-off gas to the absorbent solution located in the second space, and the gas lift-off gas output position in the second space is higher than the highest point of the first connecting area.

4. The carbon capture system according to claim 3, characterized in that... The internal absorbent deoxygenation tank is also provided with a second partition plate. The second partition plate is arranged in the second space and is opposite to the first partition plate, thereby dividing the second space into two parts: the side of the second partition plate facing the first partition plate and the side away from the first partition plate. A second communication area is provided between the second partition plate and the inner top wall of the internal absorbent deoxygenation tank, so that the portions of the second space located on both sides of the second partition plate are connected. The air extraction outlet in the second space is located between the first partition plate and the second partition plate; The connection point between the internal solution pump and the internal absorbent deoxygenation tank is located on the side of the second partition plate away from the first partition plate.

5. The carbon capture system according to claim 3, characterized in that... A return gas pipe is also provided between the absorption tower and the internal absorbent deoxygenation tank. The connection between the return gas pipe and the internal absorbent deoxygenation tank is located on the top wall of the first space. The return gas pipe is used to return a portion of the gas carried by the absorbent solution from the absorption tower back to the absorption tower.

6. The carbon capture system according to claim 3, characterized in that... A demisting device is provided at the top of the second space, so that the gas in the internal absorbent deoxygenation tank passes through the demisting device before flowing to the gas receiving pipe.

7. The carbon capture system according to claim 1, characterized in that, Also includes: A cooling pool is located outside the absorption tower; There is a height difference between the internal absorbent deoxygenation tank and the internal solution pump. The internal solution pump is used to drive the deoxygenated absorbent solution in the internal absorbent deoxygenation tank to flow through the cooling pool and be cooled before being transported to the absorption tower.

8. The carbon capture system according to claim 1, characterized in that, Also includes: A desorption tower is used to receive the absorbent solution after reacting with the gas to desorb the carbon dioxide absorbed in the absorbent solution. and An external deoxygenation system, the external deoxygenation system comprising: An external absorbent deoxygenation tank is connected to the absorption tower and is used to receive the absorbent solution after it has reacted with the gas being treated in the absorption tower and to perform deoxygenation treatment. and An external solution pump, connected to the external absorbent deoxygenation tank, is used to transport the deoxygenated absorbent solution to the desorption tower.

9. The carbon capture system according to claim 8, characterized in that... The external deoxygenation system also includes: An external gas extraction storage tank is connected to the external absorbent deoxygenation tank, thereby supplying gas extraction gas to the absorbent solution in the external absorbent deoxygenation tank to extract oxygen gas from the absorbent solution in the external absorbent deoxygenation tank; and An external gas stripping purification tank is connected to the external absorbent deoxygenation tank and the external gas stripping storage tank, respectively, so as to receive the mixed gas containing gas stripping gas flowing out from the external absorbent deoxygenation tank, and transport the gas after gas stripping purification treatment to the external gas stripping storage tank.

10. The carbon capture system according to claim 8, characterized in that, Also includes: The lean-rich liquid heat exchanger is connected to the external absorbent deoxygenation tank via a first input pipe and to the desorption tower via a first output pipe, thereby receiving the absorbent solution after gas stripping treatment and conveying it to the desorption tower. It is also connected to the desorption tower via a second input pipe and to the absorption tower via a second output pipe, thereby receiving the absorbent solution after desorption treatment and conveying it to the absorption tower, and enabling heat exchange between the absorbent solution after gas stripping treatment and the absorbent solution after desorption treatment.

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