Heat exchange system and carbon capture system

Abstract

The utility model provides a heat exchange system and a carbon capture system. The heat exchange system is arranged between an absorption tower and a regeneration tower of the carbon capture system, the heat exchange system comprises at least one exhaust container, the exhaust container is provided with a container chamber, a liquid inlet, a liquid outlet and an exhaust port, the liquid inlet, the liquid outlet and the exhaust port are communicated with the container chamber, rich liquid from the absorption tower is directly or indirectly received through the liquid inlet, and the rich liquid is discharged through the liquid outlet; and gas escaping from the rich liquid due to heat exchange is exhausted through the exhaust port. Due to the fact that carbon dioxide separated out from the rich solution due to heat exchange with the barren solution can be exhausted through the exhaust port, gas carried in the rich solution is reduced, the influence of the gas on the working condition of the heat exchanger is effectively reduced, and the phenomenon that the heat exchanger breaks down due to the fact that more gas is contained in the rich solution is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas processing, in particular to a heat exchange system and a carbon capture system. Background Art

[0002] Carbon capture is the process of capturing carbon dioxide in the gas and then storing or utilizing it, with the goal 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: the pre-treated flue gas is fed into the absorption tower through the flue, and the absorbent is used to absorb the carbon dioxide in the flue gas. The absorbent-rich liquid that absorbs carbon dioxide is then sent to the regeneration tower, where it is heated to release carbon dioxide, and then the carbon dioxide is subsequently stored or utilized. The absorbent-poor liquid after the carbon dioxide is released is then sent back to the absorption tower for recycling.

[0003] In addition, the existing technology generally uses high-temperature steam to heat the absorbent rich liquid to release carbon dioxide, so a lean-rich liquid heat exchanger is usually set between the absorption tower and the regeneration tower. The rich liquid produced by the absorption tower passes through the lean-rich liquid heat exchanger and then enters the regeneration tower, and the lean liquid produced by the regeneration tower passes through the lean-rich liquid heat exchanger and then returns to the absorption tower. Because the lean liquid is formed by heating with high-temperature steam, its temperature is very high. Therefore, it can exchange heat with the rich liquid flowing to the regeneration tower in the lean-rich liquid heat exchanger, which has a certain preliminary heating effect on the rich liquid and can improve the heat utilization rate.

[0004] However, when the rich liquid is exchanging heat with the lean liquid in the lean-rich liquid heat exchanger, some carbon dioxide gas will inevitably be released due to the heat, which will not only cause gas blockage and affect the stability of the lean-rich liquid heat exchanger, but also reduce the heat exchange efficiency of the lean-rich liquid heat exchanger. Utility Model Content

[0005] An object of the present invention is to provide a heat exchange system and a carbon capture system that solve any of the above problems.

[0006] In particular, the utility model provides a heat exchange system, which is arranged between an absorption tower and a regeneration tower of a carbon capture system, and the heat exchange system comprises:

[0007] At least one exhaust container is formed with a container chamber, and a liquid inlet, a liquid outlet and an exhaust port connected to the container chamber, so as to directly or indirectly receive the rich liquid from the absorption tower through the liquid inlet, discharge the rich liquid through the liquid outlet, and discharge the gas escaping from the rich liquid through the exhaust port.

[0008] Optionally, the heat exchange system further comprises a plurality of heat exchangers, wherein the plurality of heat exchangers are sequentially connected in series between the absorption tower and the regeneration tower, and the exhaust container is arranged between at least one group of two adjacent heat exchangers.

[0009] Optionally, a heat exchange tube is provided in the container chamber of the exhaust container, and the heat exchange tube directly or indirectly receives the lean liquid from the regeneration tower, so that the rich liquid entering the container chamber exchanges heat with the lean liquid flowing through the heat exchange tube.

[0010] Optionally, a rich liquid dispersion device is provided in the container chamber of the exhaust container, and the rich liquid dispersion device is communicated with the liquid inlet so that the rich liquid enters the container chamber in the form of multiple streams of liquid.

[0011] Optionally, the rich liquid dispersing device includes a plurality of groups of spray heads, so as to spray the rich liquid into the container chamber via the spray heads.

[0012] Optionally, a filler is provided in the exhaust container, and the filler is arranged between the liquid inlet and the liquid outlet, so that the rich liquid entering the exhaust container flows to the liquid outlet after passing through the filler.

[0013] Optionally, a demister is provided in the exhaust container, and the demister is arranged between the liquid inlet and the exhaust port, so that the gas in the exhaust container flows to the exhaust port after passing through the demister.

[0014] Optionally, the heat exchange system comprises a fan, and the fan is used to drive the gas in the exhaust container to flow out of the exhaust container.

[0015] Optionally, the heat exchange system includes a solution pump, which is connected to the liquid outlet and is used to drive the rich liquid in the exhaust container to flow out of the liquid outlet.

[0016] In another aspect of the present application, a carbon capture system is provided, comprising:

[0017] An absorption tower, the absorption tower is used to capture carbon dioxide using lean liquid;

[0018] A regeneration tower, the regeneration tower is used to desorb carbon dioxide in the rich liquid;

[0019] a regeneration tower waste heat recovery device, the regeneration tower waste heat recovery device is used to recover waste heat from steam and steam condensate discharged from the reboiler of the regeneration tower; and

[0020] According to any one of the above heat exchange systems, the heat exchange system is arranged between the absorption tower and the regeneration tower.

[0021] Optionally, the carbon capture system includes a rich liquid shunt branch and at least one heat exchange device, the heat exchange device is connected in series between the absorption tower and the regeneration tower, one end of the rich liquid shunt branch is connected to the rich liquid outlet of one of the heat exchange devices, and the other end leads to the regeneration tower or the flue gas duct of the carbon capture system or the regeneration tower waste heat recovery device, so that the rich liquid with a higher temperature after at least one stage of lean-rich liquid heat exchange flows to the regeneration tower or the flue gas duct or the regeneration tower waste heat recovery device.

[0022] Optionally, the carbon capture system comprises a lean liquid diversion branch and a plurality of heat exchange devices, wherein the plurality of heat exchange devices are connected in series between the absorption tower and the regeneration tower, one end of the lean liquid diversion branch is connected to the lean liquid outlet of the regeneration tower, and the other end leads to the lean liquid outlet side of the heat exchange device, so that part of the lean liquid flowing out of the regeneration tower can pass through at least one heat exchange device and flow into another heat exchange device.

[0023] The heat exchange system of the utility model is provided with an exhaust container in the heat exchange system, and the exhaust container is provided with a liquid inlet, a liquid outlet and an exhaust port, so that the rich liquid can enter the exhaust container from the liquid inlet and flow out of the exhaust container from the liquid outlet. In the process of the rich liquid flowing through the exhaust container, the carbon dioxide precipitated from the rich liquid due to heat exchange with the lean liquid can be discharged through the exhaust port, thereby reducing the gas carried in the rich liquid, effectively reducing the influence of the gas on the working condition of the heat exchanger, and helping to avoid the heat exchanger from malfunctioning due to the rich liquid containing more gas. At the same time, it also helps to improve the heat exchange effect between the rich liquid and the lean liquid.

[0024] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0026] Figure 1 is a schematic block diagram of a carbon capture system according to an embodiment of the present invention;

[0027] Figure 2 is a schematic principle diagram of a heat exchange system according to an embodiment of the utility model;

[0028] Figure 3 is a schematic diagram of an exhaust container in a heat exchange system according to an embodiment of the utility model;

[0029] Figure 4is a schematic diagram of an exhaust container in a heat exchange system according to another embodiment of the utility model;

[0030] Figure 5 is a schematic block diagram of a carbon capture system according to another embodiment of the present invention;

[0031] Figure 6 is a schematic block diagram of a carbon capture system according to yet another embodiment of the present invention. DETAILED DESCRIPTION

[0032] It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention, and the embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] Furthermore, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment, the carbon capture system includes an absorption tower 100, a regeneration tower 200 and a heat exchange system 300. The absorption tower 100 is used to capture carbon dioxide using lean liquid. The regeneration tower 200 is used to precipitate carbon dioxide in rich liquid. The heat exchange system 300 is arranged between the absorption tower 100 and the regeneration tower 200.

[0036] The heat exchange system 300 includes at least one exhaust container 310, which is formed with a container chamber, and a liquid inlet, a liquid outlet, and an exhaust port connected to the container chamber, so as to directly or indirectly receive the rich liquid from the absorption tower through the liquid inlet, discharge the rich liquid through the liquid outlet, and discharge the gas escaping from the rich liquid due to heat exchange through the exhaust port. In addition, the heat exchange system 300 also includes a plurality of heat exchangers 320, which are sequentially connected in series between the absorption tower 100 and the regeneration tower 200, and the exhaust container 310 is arranged between at least one group of two adjacent heat exchangers 320.

[0037] like Figure 2 and Figure 3 As shown, specifically, in this embodiment, the heat exchange system 300 includes two heat exchangers 320 and an exhaust container 310. The rich liquid flow path of the first heat exchanger 320 connects the rich liquid outlet of the absorption tower 100 and the liquid inlet of the exhaust container 310, and the rich liquid flow path of the second heat exchanger 320 connects the liquid outlet of the exhaust container 310 and the rich liquid inlet of the regeneration tower 200, so that the rich liquid flowing out of the rich liquid outlet of the absorption tower 100 passes through the first heat exchanger 320, the exhaust container 310 and the second heat exchanger 320 in sequence and then enters the regeneration tower 200 through the rich liquid inlet. That is, the exhaust container 310 indirectly receives the rich liquid from the absorption tower 100 through the liquid inlet.

[0038] For ease of description, the heat exchanger 320 between the absorption tower 100 and the exhaust container 310 will be referred to as the first heat exchanger 320 , and the heat exchanger 320 between the regeneration tower 200 and the exhaust container 310 will be referred to as the second heat exchanger 320 hereinafter.

[0039] Furthermore, the lean liquid flow path of the first heat exchanger 320 is connected to the lean liquid outlet of the regeneration tower 200 and the lean liquid flow path of the second heat exchanger 320, and the lean liquid flow path of the second heat exchanger 320 is further connected to the lean liquid inlet of the absorption tower 100, so that the lean liquid flowing out of the lean liquid outlet of the regeneration tower 200 passes through the first heat exchanger 320 and the second heat exchanger 320 in sequence and then enters the absorption tower 100 through the lean liquid inlet. In addition, the rich liquid and the lean liquid exchange heat in the heat exchanger 320. Among them, the heat exchanger 320 can be any heat exchanger that can perform heat exchange between two fluids.

[0040] Reference Figure 2 and Figure 3As shown, the exhaust container 310 is a cylindrical tank, and the internal space of the cylindrical tank is the container chamber of the exhaust container 310. The liquid inlet is arranged on the side of the exhaust container 310, the liquid outlet is arranged on the bottom of the exhaust container 310, and the exhaust port is arranged on the top of the exhaust container 310. That is to say, in the longitudinal direction, the positions of the exhaust port, the liquid inlet and the liquid outlet of the exhaust container 310 are successively lowered. When the rich liquid enters the exhaust container 310, the gas flows upward and flows out from the exhaust port, and the rich liquid flows downward and flows out from the liquid outlet.

[0041] Reference Figure 1 and Figure 2 As shown, taking the treatment of flue gas as an example, during the operation of the carbon capture system, the pretreated flue gas enters the absorption tower 100, in which the flue gas and the absorbent lean liquid react, and the lean liquid absorbs the carbon dioxide in the flue gas to become a rich liquid, and the rich liquid flows out from the rich liquid outlet of the absorption tower 100, flows into the first heat exchanger 320, and enters the exhaust container 310 after passing through the first heat exchanger 320. At this time, part of the carbon dioxide is precipitated from the rich liquid after one heat exchange, and the precipitated carbon dioxide is discharged from the exhaust port of the exhaust container 310, and then the rich liquid flows from the exhaust container 310 to the second heat exchanger 320, and then enters the regeneration tower 200 after passing through the second heat exchanger 320.

[0042] In the regeneration tower 200, the rich liquid is treated with high-temperature steam to release the carbon dioxide in the rich liquid, and the carbon dioxide gas is transported out separately for subsequent treatment. The absorbent that has released carbon dioxide turns back into the absorbent lean liquid, flows out from the lean liquid outlet, enters the second heat exchanger 320, passes through the second heat exchanger 320, enters the first heat exchanger 320, and then enters the absorption tower 100 through the lean liquid inlet of the absorption tower 100, and is used to absorb carbon dioxide in the flue gas again. Because the absorbent is heated by high-temperature steam in the regeneration tower 200, the temperature is very high, and the rich liquid flowing out of the absorption tower 100 and the lean liquid flowing out of the regeneration tower 200 can achieve heat exchange in the two heat exchangers 320.

[0043] It should be noted that the carbon dioxide exhausted from the exhaust container 310 can also be sealed or utilized.

[0044] In the solution of this embodiment, by setting the exhaust container 310 in the heat exchange system 300, the exhaust container 310 is provided with a liquid inlet, a liquid outlet and an exhaust port, so that the rich liquid can enter the exhaust container 310 from the liquid inlet and flow out of the exhaust container 310 from the liquid outlet. In the process of the rich liquid flowing through the exhaust container 310, the carbon dioxide precipitated from the rich liquid due to heat exchange with the lean liquid can be discharged through the exhaust port, thereby reducing the gas carried in the rich liquid, effectively reducing the impact of the gas on the working condition of the heat exchanger 320, and helping to avoid the heat exchanger 320 from malfunctioning due to the rich liquid containing more gas. At the same time, it also helps to improve the heat exchange effect between the rich liquid and the lean liquid.

[0045] It should be noted that in some other embodiments, the number of heat exchangers may be three, four or more, wherein an exhaust container may be provided between every two adjacent heat exchangers, or an exhaust container may be provided every two or other numbers of heat exchangers.

[0046] like Figure 2 and Figure 3 As shown, further, a rich liquid dispersion device 311 is provided in the exhaust container 310, and the rich liquid dispersion device 311 is connected to the liquid inlet so that the rich liquid enters the container chamber in the form of multiple streams of liquid. Specifically, the rich liquid dispersion device 311 includes multiple groups of spray heads 3111, so as to spray the rich liquid into the container chamber through the spray heads 3111. Specifically, the spray heads 3111 receive the rich liquid through a portion of the spray pipeline located outside the exhaust container 310, and use a portion of the spray pipeline located inside the exhaust container 310 to transport the rich liquid to the spray heads 3111, and the nozzle of the spray pipeline receiving the rich liquid can be regarded as the liquid inlet of the exhaust container.

[0047] By using the spray head 3111 to spray the rich liquid into the exhaust container 310, the surface area of ​​the rich liquid can be increased, so that the precipitated gaseous carbon dioxide can be better released from the rich liquid, thereby more effectively reducing the gas in the rich liquid.

[0048] It should be noted that, in some other embodiments, the rich liquid dispersion device may also be other flow distribution devices, such as a pipeline with multiple outlets, so that the rich liquid enters the exhaust container in the form of multiple liquid flows from the multiple outlets.

[0049] like Figure 3 As shown, further, every two spray heads 3111 are arranged opposite to each other, so that the rich liquid sprayed by the two spray heads 3111 can collide with each other to form smaller droplets, thereby further improving the release effect of the gaseous carbon dioxide that has been precipitated in the rich liquid.

[0050] like Figure 2 and Figure 3 As shown, a packing 312 is provided in the exhaust container 310, and the packing 312 is arranged between the liquid inlet and the liquid outlet of the exhaust container 310, so that the rich liquid entering the exhaust container 310 flows to the liquid outlet after passing through the packing 312. In the process of the rich liquid flowing through the packing 312, the rich liquid is dispersed on the surface of the packing 312, thereby increasing the surface area of ​​the rich liquid, improving the release effect of the gaseous carbon dioxide of the rich liquid in the exhaust container 310, and further reducing the gas in the rich liquid.

[0051] like Figure 2 and Figure 3As shown, further, a demister 313 is provided in the exhaust container 310, and the demister 313 is arranged between the liquid inlet and the exhaust port of the exhaust container 310, so that the gas in the exhaust container 310 flows to the exhaust port after passing through the demister 313. The demister 313 can remove other impurities in the gas except carbon dioxide, such as moisture, etc., to ensure the purity of the carbon dioxide gas flowing out of the exhaust container 310, and also help to reduce the damage to the exhaust pipeline caused by impurities entering the exhaust pipeline.

[0052] like Figure 3 As shown, a one-way valve 314 is provided on the exhaust path of the exhaust container 310. The one-way valve 314 is set on the exhaust pipe connected to the exhaust port of the exhaust container 310, so as to only allow gaseous carbon dioxide to flow out of the exhaust container 310 and continuously flow along the exhaust pipe in a direction away from the exhaust container 310, while preventing the gas from flowing back to the exhaust container 310.

[0053] It should be noted that the one-way valve may also be arranged at the exhaust port of the exhaust container.

[0054] It should be noted that, in some other embodiments, an openable and closable two-way valve may also be provided on the exhaust path of the exhaust container.

[0055] Although not shown in the figure, the heat exchange system 300 further includes a fan, which is used to drive the gas in the exhaust container 310 to flow out of the exhaust container 310. Specifically, the fan can be arranged in the exhaust container 310, and is arranged to blow air to the exhaust port of the exhaust container 310. It can also be arranged at the exhaust port of the exhaust container 310, and is arranged to blow air to the outside of the exhaust port. It can also be arranged on the exhaust duct connected to the exhaust port of the exhaust container 310, and is arranged to blow air to the side away from the exhaust port.

[0056] By providing a fan, the fan can drive the gas in the exhaust container 310 to flow out of the exhaust container 310, thereby improving the gas exhaust efficiency.

[0057] Although not shown in the figure, the heat exchange system 300 further includes a solution pump, which is connected to the liquid outlet of the exhaust container 310 and is used to drive the rich liquid in the exhaust container 310 to flow out of the liquid outlet, thereby improving the flow efficiency of the rich liquid.

[0058] like Figure 1 and Figure 4 As shown, in another embodiment, a heat exchange tube 315 is provided in the container chamber of the exhaust container 310, and the heat exchange tube 315 directly or indirectly receives the lean liquid from the regeneration tower 200, so that the rich liquid entering the container chamber exchanges heat with the lean liquid flowing through the heat exchange tube 315. In other words, the exhaust container 310 can also have a heat exchange effect on the rich liquid. On the basis of exhausting gas, the heat exchange efficiency between the rich liquid and the lean liquid can also be improved.

[0059] It should be noted that in this embodiment, the heat exchange system may only include a plurality of exhaust containers, that is, the exhaust container connected to the absorption tower directly receives the rich liquid from the absorption tower via the liquid inlet. Alternatively, it may also include an exhaust container and a common heat exchanger.

[0060] In addition, it should be noted that the exhaust container of this embodiment may also be provided with components such as a rich liquid dispersion device, a filler or a demister, etc. Please refer to the above description for details, which will not be repeated here.

[0061] like Figure 5 As shown, in one embodiment, the carbon capture system includes a rich liquid flow branch 10 and at least one heat exchange device 400, the heat exchange device 400 is connected in series between the absorption tower 100 and the regeneration tower 200, one end of the rich liquid flow branch 10 is connected to the rich liquid outlet of one of the heat exchange devices 400, and the other end leads to the flue gas duct of the carbon capture system, so that the rich liquid with a higher temperature after at least one stage of lean and rich liquid heat exchange flows to the flue gas duct. Specifically, the heat exchange device 400 can be a heat exchanger or an exhaust container provided with a heat exchange pipe.

[0062] like Figure 5 As shown, the heat exchange device 400 relatively close to the absorption tower 100 is the first heat exchange device 400, the heat exchange device 400 relatively far from the absorption tower 100 is the second heat exchange device 400, and the rich liquid branch 10 connects the rich liquid outlet of the first heat exchange device 400 and the flue gas duct. In other words, the rich liquid flowing out of the absorption tower 100, after heat exchange in the first heat exchange device 400, makes part of the rich liquid flow to the flue gas to exchange heat with the flue gas.

[0063] Because if the rich liquid flowing out of the absorption tower 100 is directly used for diversion, although the temperature is lower, the heat exchange efficiency with the flue gas is not significantly improved. Therefore, the rich liquid is first heat exchanged with the lean liquid at least once and then heat exchanged with the flue gas. There is not much difference in the heat exchange efficiency with the flue gas, but the heat of the lean liquid is more fully utilized, thereby improving the heat exchange efficiency as a whole.

[0064] It should be noted that, in some other embodiments, the rich liquid flow branch may also lead to other places where heat can be exchanged, such as a regeneration tower, to exchange heat with the outlet gas of the regeneration tower.

[0065] In addition, in some other embodiments, the rich liquid diversion branch may also lead to a regeneration tower waste heat recovery device, which is used to recover waste heat from the steam and steam condensate discharged from the reboiler of the regeneration tower, that is, to exchange heat between the rich liquid and the steam and steam condensate discharged from the reboiler of the regeneration tower.

[0066] It should be noted that in some other embodiments, the number of heat exchange devices may be three or more, and the rich liquid flow branch may be arranged at the rich liquid outlet side of any number of heat exchange devices at a distance from the absorption tower. Alternatively, multiple rich liquid flow branches may be arranged.

[0067] like Figure 6 As shown, in one embodiment, the carbon capture system includes a lean liquid flow branch 20 and a plurality of heat exchange devices 400, wherein the plurality of heat exchange devices 400 are connected in series between the absorption tower 100 and the regeneration tower 200, and one end of the lean liquid flow branch 20 is connected to the lean liquid outlet of the regeneration tower, and the other end is connected to the lean liquid outlet side of one of the heat exchange devices 400, so that part of the lean liquid flowing out of the regeneration tower 200 can pass through at least one heat exchange device 400 and flow into another heat exchange device 400. Specifically, the heat exchange device 400 can be a heat exchanger or an exhaust container provided with a heat exchange pipe.

[0068] like Figure 6 As shown, the heat exchange device 400 relatively close to the regeneration tower 200 is the first heat exchange device 400, and the heat exchange device 400 relatively far from the regeneration tower 200 is the second heat exchange device 400. The lean liquid diversion branch 20 connects the lean liquid outlet of the regeneration tower and the lean liquid outlet side of the first heat exchange device 400, so that part of the lean liquid bypasses the first heat exchange device 400 and flows directly to the second heat exchange device 400, which helps to improve the flexibility of lean liquid heat utilization.

[0069] It should be noted that, in some other embodiments, the number of heat exchange devices may be three or more, and the lean liquid branch may pass through more heat exchange devices. Alternatively, multiple lean liquid branch may be provided, or the regeneration tower connected to the lean liquid branch may be another regeneration tower.

[0070] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in 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 heat exchange system, which is arranged between an absorption tower and a regeneration tower of a carbon capture system, characterized in that: The heat exchange system comprises: at least one exhaust container, the exhaust container being formed with a container chamber, and a liquid inlet, a liquid outlet and an exhaust port communicating with the container chamber, so as to directly or indirectly receive the rich liquid from the absorption tower through the liquid inlet, discharge the rich liquid through the liquid outlet, and discharge the gas escaping from the rich liquid due to heat exchange through the exhaust port; A heat exchange tube is disposed in the container chamber of the exhaust container, and the heat exchange tube directly or indirectly receives the lean liquid from the regeneration tower, so that the rich liquid entering the container chamber exchanges heat with the lean liquid flowing through the heat exchange tube.

2. The heat exchange system according to claim 1, characterized in that: The heat exchange system further includes a plurality of heat exchangers, which are sequentially connected in series between the absorption tower and the regeneration tower, and the exhaust container is arranged between at least one group of two adjacent heat exchangers.

3. The heat exchange system according to claim 1, characterized in that: A rich liquid dispersing device is disposed in the container chamber of the exhaust container, and the rich liquid dispersing device is communicated with the liquid inlet so that the rich liquid enters the container chamber in the form of multiple streams of liquid.

4. The heat exchange system according to claim 3, characterized in that: The rich liquid dispersing device includes a plurality of groups of spray heads, so as to spray the rich liquid into the container chamber via the spray heads.

5. The heat exchange system according to claim 1, characterized in that: A filler is provided in the exhaust container, and the filler is arranged between the liquid inlet and the liquid outlet, so that the rich liquid entering the exhaust container flows to the liquid outlet after passing through the filler.

6. The heat exchange system according to claim 1, characterized in that: A demister is provided in the exhaust container, and the demister is arranged between the liquid inlet and the exhaust port, so that the gas in the exhaust container flows to the exhaust port after passing through the demister.

7. The heat exchange system according to claim 1, characterized in that: The heat exchange system comprises a fan, and the fan is used to drive the gas in the exhaust container to flow out of the exhaust container.

8. The heat exchange system according to claim 1, characterized in that: The heat exchange system comprises a solution pump, which is connected to the liquid outlet and is used to drive the rich liquid in the exhaust container to flow out of the liquid outlet.

9. A carbon capture system, characterized in that: include: an absorption tower, the absorption tower being used to capture carbon dioxide using lean liquid; A regeneration tower, the regeneration tower is used to desorb carbon dioxide in the rich liquid; a regeneration tower waste heat recovery device, the regeneration tower waste heat recovery device is used to recover waste heat from steam and steam condensate discharged from the reboiler of the regeneration tower; and According to the heat exchange system according to any one of claims 1 to 8, the heat exchange system is arranged between the absorption tower and the regeneration tower.

10. The carbon capture system according to claim 9, characterized in that The carbon capture system includes a rich liquid shunt branch and at least one heat exchange device, wherein the heat exchange device is connected in series between the absorption tower and the regeneration tower, one end of the rich liquid shunt branch is connected to the rich liquid outlet of one of the heat exchange devices, and the other end leads to the regeneration tower or the flue gas duct of the carbon capture system or the regeneration tower waste heat recovery device, so that the rich liquid with a higher temperature after at least one stage of lean-rich liquid heat exchange flows to the regeneration tower or the flue gas duct or the regeneration tower waste heat recovery device.

11. The carbon capture system according to claim 9, characterized in that The carbon capture system comprises a lean liquid diversion branch and a plurality of heat exchange devices, wherein the plurality of heat exchange devices are connected in series between the absorption tower and the regeneration tower, one end of the lean liquid diversion branch is connected to the lean liquid outlet of the regeneration tower, and the other end leads to the lean liquid outlet side of one of the heat exchange devices, so that part of the lean liquid flowing out of the regeneration tower can pass through at least one heat exchange device and flow into another heat exchange device.

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