Carbon capture system

Abstract

The utility model provides a carbon capture system which comprises a regeneration tower and a reboiler, and further comprises a first heat exchanger which is provided with a first medium flow path and a second medium flow path, an inlet of the first medium flow path is communicated with an exhaust port of the regeneration tower, and the second medium flow path is used for allowing liquid water to pass through; the carbon dioxide gas discharged from the regeneration tower is used for heating the liquid water; a condensate water outlet of the reboiler is communicated with a first pipeline, an outlet of the second medium flow path is communicated with a second pipeline, the first pipeline and the second pipeline are converged and then communicated with a heat source inlet of the heat pump device, and a heat source outlet of the heat pump device is communicated with an inlet of the second medium flow path. By arranging the first heat exchanger and the heat pump device, liquid water heated by carbon dioxide gas and condensed water flowing out of the reboiler are converged and then are introduced into the heat pump device, so that heat of the carbon dioxide gas discharged by the regeneration tower and heat of the condensed water flowing out of the reboiler are recycled by the heat pump device.

Description

Technical Field

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

[0002] Carbon dioxide is one of the main components of greenhouse gases that cause global warming. In addition to the negative impact of global warming, carbon dioxide can also be used as a chemical raw material and for other industrial purposes. Carbon capture, utilization and storage (CCUS) technology is the main way to achieve carbon dioxide emission reduction.

[0003] Carbon capture technology is commonly used in flue gas treatment. For a large amount of flue gas generated by a factory, the carbon dioxide in the flue gas is first absorbed by an absorbent solution to obtain an absorbent-rich liquid, and then the carbon dioxide is released from the absorbent-rich liquid by heating with high-temperature steam, and then the carbon dioxide is subsequently sealed or utilized. Therefore, how to improve the heat recovery rate in the carbon capture system is also one of the directions in which the carbon capture system needs to be continuously improved. Utility Model Content

[0004] An object of the utility model is to provide a carbon capture system capable of improving heat recovery efficiency.

[0005] In particular, the utility model provides a carbon capture system, comprising a regeneration tower and a reboiler, the carbon capture system further comprising:

[0006] a first heat exchanger having a first medium flow path and a second medium flow path, wherein an inlet of the first medium flow path is communicated with an exhaust port of the regeneration tower, and the second medium flow path is used for passing liquid water to heat the liquid water using carbon dioxide gas discharged from the regeneration tower; and

[0007] A heat pump device, wherein the condensate outlet of the reboiler is connected to a first pipeline, the outlet of the second medium flow path is connected to a second pipeline, the first pipeline and the second pipeline are connected to the heat source inlet of the heat pump device after merging, and the heat source outlet of the heat pump device is connected to the inlet of the second medium flow path.

[0008] Optionally, the carbon capture system comprises a drainage pipeline, which is arranged between the heat source outlet of the heat pump device and the inlet of the second medium flow path, and is used to discharge part of the liquid flowing from the heat pump device to the first heat exchanger.

[0009] Optionally, the carbon capture system comprises a flow detection device, which is arranged in a pipeline portion between the drainage pipeline and an inlet of the second medium flow path, and is used to detect a water flow rate flowing to the first heat exchanger.

[0010] Optionally, the carbon capture system comprises an absorption tower, and the heat absorbing medium inlet of the heat pump device directly or indirectly receives absorbent rich liquid from the absorption tower to increase the temperature of the absorbent rich liquid.

[0011] Optionally, the carbon capture system comprises a lean-rich liquid heat exchanger, and the heat absorbing medium inlet of the heat pump device is connected to the rich liquid outlet of the lean-rich liquid heat exchanger, thereby indirectly receiving the absorbent rich liquid from the absorption tower.

[0012] Optionally, the carbon capture system includes a second heat exchanger, the second heat exchanger has a third medium flow path and a fourth medium flow path, the second heat exchanger is arranged in the first pipeline, and the third medium flow path is connected to the first pipeline, so that the condensed water flowing out of the condensed water outlet passes through the third medium flow path;

[0013] The inlet of the fourth medium flow path directly or indirectly receives the absorbent rich liquid from the absorption tower, and the outlet of the fourth medium flow path leads to the regeneration tower.

[0014] Optionally, the carbon capture system further comprises a flue gas heat exchanger, which directly receives the absorbent rich liquid from the absorption tower and receives the flue gas flowing to the absorption tower, so that the absorbent rich liquid and the flue gas from the absorption tower are heat exchanged and then flow to the second heat exchanger.

[0015] Optionally, a demister is provided in the regeneration tower, and the regeneration tower is configured so that the carbon dioxide gas desorbed inside flows out of the regeneration tower after passing through the demister.

[0016] Optionally, the heat pump device is a second type absorption heat pump.

[0017] Optionally, the first heat exchanger is configured such that the water inlet temperature is greater than or equal to 55 degrees Celsius and less than or equal to 65 degrees Celsius, and the water outlet temperature is greater than or equal to 90 degrees Celsius and less than or equal to 100 degrees Celsius.

[0018] The carbon capture system of the utility model is provided with a first heat exchanger and a heat pump device, so that the high-temperature carbon dioxide gas discharged from the regeneration tower exchanges heat with liquid water through the first heat exchanger, and then heats the liquid water, and then the liquid water heated by the carbon dioxide gas and the condensed water flowing out of the reboiler are merged and passed into the heat pump device, so that the heat of the carbon dioxide gas discharged from the regeneration tower and the heat of the condensed water flowing out of the reboiler are recovered by the heat pump device, thereby improving the heat recovery rate of the carbon capture system and saving energy. In addition, because the carbon dioxide gas carries some corrosive impurities, the liquid water is used to absorb the heat of the high-temperature carbon dioxide gas and then merged with the condensed water generated by the reboiler and then passed into the heat pump device, so as to recover the heat while avoiding the carbon dioxide gas directly entering the heat pump and causing damage to the heat pump. In addition, the liquid water is merged with the condensed water generated by the reboiler and then passed into the heat pump device, which helps to make more full use of the heat.

[0019] 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

[0020] 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:

[0021] Figure 1 is a schematic principle diagram of a carbon capture system according to an embodiment of the utility model;

[0022] Figure 2 is a partial schematic diagram of a carbon capture system according to an embodiment of the utility model;

[0023] Figure 3 is a schematic principle diagram of a carbon capture system according to another embodiment of the utility model;

[0024] Figure 4 is a schematic principle diagram of a carbon capture system according to yet another embodiment of the utility model. DETAILED DESCRIPTION

[0025] 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.

[0026] 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", "clockwise", "counterclockwise" 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.

[0027] 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 mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection 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 the specific circumstances.

[0028] Reference Figure 1 As shown, first, the parts that are the same as those in the prior art are described. Generally, the carbon capture system includes an absorption tower 100, a regeneration tower 200, a lean-rich liquid heat exchanger 300, and a reboiler 400. The absorption tower 100 is used to receive flue gas, and an absorbent is sprayed in the absorption tower 100. The absorbent reacts with the flue gas in the absorption tower 100, and the absorbent absorbs carbon dioxide in the flue gas to form an absorbent-rich liquid. The lean-rich liquid heat exchanger 300 has a rich liquid inlet and a rich liquid outlet, as well as a lean liquid inlet and a lean liquid outlet. The absorbent-rich liquid formed in the absorption tower 100 flows from the absorption tower 100 to the lean-rich liquid heat exchanger 300, enters the lean-rich liquid heat exchanger 300 through the rich liquid inlet, and then flows out of the lean-rich liquid heat exchanger 300 from the rich liquid outlet.

[0029] The regeneration tower 200 is used to receive the absorbent rich liquid. The absorbent rich liquid flowing out of the lean-rich liquid heat exchanger 300 flows to the regeneration tower 200, is heated by high-temperature steam in the regeneration tower 200, and carbon dioxide is released from the absorbent rich liquid, and the absorbent rich liquid becomes the absorbent lean liquid. The released carbon dioxide is released from the regeneration tower 200 for subsequent storage or utilization. The absorbent lean liquid flows from the regeneration tower 200 to the lean-rich liquid heat exchanger 300, enters the lean-rich liquid heat exchanger 300 from the lean liquid inlet, and then flows out of the lean-rich liquid heat exchanger 300 from the lean liquid outlet. The absorbent lean liquid flowing out of the lean liquid outlet of the lean-rich liquid heat exchanger 300 flows to the absorption tower 100, and is then used to react with the flue gas in the absorption tower 100 to achieve the recycling of the absorbent.

[0030] Because the absorbent lean liquid is obtained by heating with high-temperature steam, its temperature is relatively high, and it can exchange heat with the absorbent rich liquid in the lean-rich liquid heat exchanger 300 to heat the absorbent rich liquid and increase the temperature of the absorbent rich liquid, thereby recovering part of the heat and improving the subsequent reaction efficiency of the absorbent rich liquid in the regeneration tower 200.

[0031] Furthermore, the reboiler 400 is used to generate high-temperature steam for supplying to the regeneration tower 200. At the same time, part of the lean absorbent liquid flowing out of the regeneration tower 200 will enter the reboiler 400, be heated by the steam with the highest temperature in the reboiler 400, and then return to the regeneration tower 200, and also be used to heat the rich absorbent liquid in the regeneration tower 200. At the same time, it is also heated to the greatest extent, so that the carbon dioxide is desorbed more thoroughly. The condensed water generated by the reboiler 400 is discharged from the condensed water outlet.

[0032] Based on the above, it is clear that in the prior art, because the absorbent rich liquid is desorbed by high-temperature steam, the temperature of the carbon dioxide gas flowing out of the regeneration tower is also relatively high, and this part of the heat is wasted. In addition, the temperature of the condensed water flowing out of the reboiler is also relatively high, and this part of the heat is not recovered, resulting in waste.

[0033] Reference Figure 1 As shown, in this embodiment, the carbon capture system further includes a first heat exchanger 500 and a heat pump device 600. The first heat exchanger 500 has a first medium flow path and a second medium flow path, the inlet of the first medium flow path is connected to the exhaust port of the regeneration tower 200, and the second medium flow path is used to pass liquid water to heat the liquid water using the carbon dioxide gas discharged from the regeneration tower 200. The condensed water outlet of the reboiler 400 is connected to the first pipeline 10, and the outlet of the second medium flow path is connected to the second pipeline 20. The first pipeline 10 and the second pipeline 20 are connected to the heat source inlet of the heat pump device 600 after merging, and the heat source outlet of the heat pump device 600 is connected to the inlet of the second medium flow path. The heat absorbing medium inlet of the heat pump device 600 directly or indirectly receives the absorbent rich liquid from the absorption tower 100 to heat the absorbent rich liquid.

[0034] Reference Figure 1 As shown, specifically, the first heat exchanger 500 is a heat exchanger for exchanging heat between two fluids, such as a plate heat exchanger, a shell and tube heat exchanger, etc. The high-temperature carbon dioxide flowing out of the regeneration tower 200 enters the first medium flow path of the first heat exchanger 500 from the inlet of the first medium flow path, flows along the first medium flow path and finally flows out from the outlet of the first medium flow path. The carbon dioxide flowing out from the outlet of the first medium flow path is subsequently sealed or utilized.

[0035] Liquid water enters the second medium flow path of the first heat exchanger 500 from the inlet of the second medium flow path, flows along the second medium flow path and finally flows out from the outlet of the second medium flow path. The carbon dioxide flowing in the first medium flow path exchanges heat with the liquid water flowing in the second medium flow path, and the high-temperature carbon dioxide is used to heat the liquid water, that is, the liquid water absorbs the heat of the high-temperature carbon dioxide.

[0036] Furthermore, the heat source inlet of the heat pump device 600 is the inlet through which the medium providing heat or the medium from which heat is recovered enters the heat pump device 600, and the heat absorbing medium inlet is the inlet through which the medium absorbing heat or the medium being heated enters the heat pump device 600. Specifically, the heat pump device 600 is a second-class absorption heat pump, which generally has an evaporator, a generator, an absorber, and a condenser. The coolant enters from the condenser inlet and flows out from the condenser outlet.

[0037] Among them, it should be noted that the heat source inlet of the second type absorption heat pump can be the inlet of the evaporator, and the heat source outlet is the outlet of the generator, that is, the medium providing heat enters the second type absorption heat pump and flows through the evaporator and the generator before flowing out. Alternatively, the heat source inlet can be the general term for the evaporator inlet and the generator inlet, and the heat source outlet can be the general term for the evaporator outlet and the generator outlet. The medium providing heat is divided into two streams and enters the evaporator and the generator respectively from the heat source inlet, and then flows out from the evaporator outlet and the generator outlet respectively and then merges into one stream. The heat absorption medium inlet is the absorber inlet, and the heated medium enters the second type absorption heat pump from the absorber inlet, and flows out from the absorber outlet after the absorber is heated. In addition, the coolant enters from the condenser inlet and flows out from the condenser outlet.

[0038] Continue to refer to Figure 1 As shown, the liquid water heated in the first heat exchanger 500 enters the second pipeline 20, and the condensed water produced in the reboiler 400 enters the first pipeline 10. The first pipeline 10 and the second pipeline 20 are connected to the heat source inlet of the heat pump device 600 after merging. In other words, the liquid water heated in the first heat exchanger 500 and the condensed water produced in the reboiler 400 are mixed and then flow to the heat source inlet of the heat pump device 600. After the mixed water releases heat in the heat pump device 600, it flows back to the first heat exchanger 500 and continues to be circulated.

[0039] Furthermore, the heat absorbing medium inlet of the heat pump device 600 is connected to the rich liquid outlet of the lean-rich liquid heat exchanger 300, thereby indirectly receiving the absorbent rich liquid from the absorption tower 100. That is, the absorbent rich liquid flowing out of the lean-rich liquid heat exchanger 300 enters the heat pump device 600 and is further heated, and then passes to the regeneration tower 200 for desorption. In other words, the heat pump device 600 further heats the absorbent rich liquid flowing out of the lean-rich liquid heat exchanger 300 by recovering the heat of the carbon dioxide discharged from the regeneration tower 200 and the condensed water generated by the reboiler 400.

[0040] In the scheme of this embodiment, by setting the first heat exchanger 500 and the heat pump device 600, the high-temperature carbon dioxide gas discharged from the regeneration tower 200 is heat-exchanged with liquid water through the first heat exchanger 500, and then the liquid water heated by the carbon dioxide gas is merged with the condensed water flowing out of the reboiler 400 and then introduced into the heat pump device 600, so that the heat of the carbon dioxide gas discharged from the regeneration tower 200 and the heat of the condensed water flowing out of the reboiler 400 are recovered by the heat pump device 600, thereby improving the heat recovery rate of the carbon capture system, which is beneficial to energy saving. In addition, because the carbon dioxide gas carries some corrosive impurities, the liquid water is used to absorb the heat of the high-temperature carbon dioxide gas and then merged with the condensed water generated by the reboiler 400 and then introduced into the heat pump device 600, so as to recover the heat while avoiding the carbon dioxide gas directly entering the heat pump and causing damage to the heat pump. In addition, the liquid water is merged with the condensed water generated by the reboiler 400 and then introduced into the heat pump device 600, which helps to make more full use of the heat.

[0041] Furthermore, the heat pump device 600 is used to directly or indirectly receive the absorbent rich liquid from the absorption tower 100 through the heat absorbing medium inlet, so as to heat the absorbent rich liquid, that is, the heat of the carbon dioxide gas discharged from the regeneration tower 200 and the heat of the condensed water flowing out of the reboiler 400 are recovered by the heat pump device 600 to heat the absorbent rich liquid flowing to the regeneration tower 200, thereby increasing the temperature of the absorbent rich liquid and improving the subsequent reaction efficiency of the absorbent rich liquid in the regeneration tower 200. In addition, the heat pump device 600 is used to indirectly receive the absorbent rich liquid from the absorption tower 100 by connecting the heat absorbing medium inlet to the rich liquid outlet of the lean-rich liquid heat exchanger 300, that is, the heat pump device 600 is used to reheat the absorbent rich liquid heated in the lean-rich liquid heat exchanger 300. Because the heating efficiency of the heat pump is higher, it is used to reheat the absorbent rich liquid, which helps to make more effective use of heat.

[0042] Furthermore, by configuring the heat pump device 600 as a second type absorption heat pump, it is more energy-saving compared to a compression heat pump.

[0043] It should be noted that, in some other embodiments, the heat pump device may also be a compression heat pump.

[0044] In addition, it should be noted that in some other embodiments, the heat pump device can also directly receive the absorbent-rich liquid from the absorption tower, that is, the heat absorption medium inlet of the heat pump device is directly connected to the absorption tower.

[0045] In addition, it should be noted that in some other embodiments, the heat pump device can also be used to heat other media, such as domestic water. In other words, the heat pump device is used to recover the heat of the carbon dioxide gas discharged from the regeneration tower and the heat of the condensed water flowing out of the reboiler to heat other media that need to be heated.

[0046] like Figure 1 and Figure 2 As shown, further, the carbon capture system includes a drainage pipeline 30, which is arranged between the heat source outlet of the heat pump device 600 and the inlet of the second medium flow path, and is used to discharge part of the liquid flowing from the heat pump device 600 to the first heat exchanger 500. Specifically, that is to say, after the mixed water flows out of the heat pump device 600, during the period of flowing to the first heat exchanger 500, part of the liquid flows away from the drainage pipeline 30 and no longer returns to the first heat exchanger 500.

[0047] By arranging a drainage pipeline 30 on the pipeline between the heat source outlet of the heat pump device 600 and the inlet of the second medium flow path, part of the liquid water flowing from the heat pump device 600 to the first heat exchanger 500 can flow away through the drainage pipeline 30 and no longer return to the first heat exchanger 500. Because the circulating water path flowing through the first heat exchanger 500 is continuously replenished with condensed water from the reboiler 400, by discharging part of the liquid flowing from the heat pump device 600 to the first heat exchanger 500, the water flow in the circulating water path is maintained within an appropriate range to avoid causing malfunctions.

[0048] Reference Figure 1 and Figure 2 As shown, the carbon capture system further includes a flow detection device 700, which is disposed in the pipeline portion between the drainage pipeline 30 and the inlet of the second medium flow path, and is used to detect the water flow flowing to the first heat exchanger 500. By using the flow detection device 700 to detect the water flow flowing to the first heat exchanger 500, the water flow of the circulating water path flowing through the first heat exchanger 500 is monitored in real time to ensure that the water flow is at an appropriate value, thereby preventing the drainage pipeline 30 from draining too much or too little water.

[0049] At the same time, the drainage pipeline 30 is provided with a regulating valve for adjusting the drainage speed of the drainage pipeline 30. When the water flow is too large, the regulating valve opening is increased, and when the water flow is too small, the regulating valve opening is reduced or the regulating valve is closed.

[0050] Further, the first heat exchanger 500 is configured such that the inlet water temperature is greater than or equal to 55 degrees Celsius and less than or equal to 65 degrees Celsius, and the outlet water temperature is greater than or equal to 90 degrees Celsius and less than or equal to 100 degrees Celsius. For example, the first heat exchanger 500 is configured such that the inlet water temperature is 60 degrees Celsius and the outlet water temperature is 95 degrees Celsius. Through the above configuration, the outlet water temperature of the first heat exchanger 500 is closer to the temperature of the condensed water generated by the reboiler 400, so that the temperature of the merged water is more uniform, which helps to improve the subsequent heat exchange effect in the heat pump device 600.

[0051] Reference Figure 1 and Figure 2 As shown, further, a demister 210 is provided in the regeneration tower 200, and the regeneration tower 200 is configured such that the carbon dioxide gas desorbed from the regeneration tower 200 flows out of the regeneration tower 200 after passing through the demister 210. The demister 210 can remove impurities other than carbon dioxide in the gas, such as moisture, etc., to ensure the purity of the carbon dioxide gas flowing out of the exhaust container, and also help reduce the damage caused by impurities entering the first heat exchanger 500 to the first heat exchanger 500.

[0052] like Figure 3 As shown, in another embodiment, the carbon capture system includes a second heat exchanger 800, which has a third medium flow path and a fourth medium flow path. The second heat exchanger 800 is arranged in the first pipeline 10, and the third medium flow path is connected to the first pipeline 10, so that the condensed water flowing out of the condensed water outlet passes through the third medium flow path; the inlet of the fourth medium flow path directly receives the absorbent rich liquid from the absorption tower 100, and the outlet of the fourth medium flow path leads to the regeneration tower 200.

[0053] Reference Figure 3 As shown, specifically, part of the absorbent rich liquid flowing out of the absorption tower 100 flows into the fourth medium flow path of the second heat exchanger 800, exchanges heat with the condensed water flowing through the third medium flow path, and then flows to the heat pump device 600. Correspondingly, the condensed water generated by the reboiler 400 first flows through the third medium flow path of the second heat exchanger 800, exchanges heat with the absorbent rich liquid flowing through the fourth medium flow path, and then merges with the liquid water in the second pipeline 20.

[0054] By setting up the second heat exchanger 800, part of the absorbent rich liquid flowing out of the absorption tower 100 and the condensed water generated by the reboiler 400 first enter the second heat exchanger 800 for heat exchange, and then the absorbent rich liquid flows to the heat pump device 600 for secondary heating. The condensed water then merges with the liquid water in the second pipeline 20 and flows to the heat pump device 600. Because the temperature of the condensed water generated by the reboiler 400 is relatively high compared to the temperature of the liquid water heated by the first heat exchanger 500, the absorbent rich liquid is first used to perform preliminary heat exchange with the condensed water. While preliminarily heating the absorbent rich liquid, the temperature of the condensed water is appropriately lowered so that the temperature of the condensed water is closer to the liquid water in the second pipeline 20 to be merged, and the water temperature after merging is more uniform, which helps to improve the subsequent heat exchange effect in the heat pump device 600.

[0055] It should be noted that, in some other embodiments, the inlet of the fourth medium flow path may also be connected to the outlet of the lean-rich liquid heat exchanger, that is, indirectly receiving the absorbent rich liquid from the absorption tower. Therefore, the inlet of the fourth medium flow path may directly or indirectly receive the absorbent rich liquid from the absorption tower.

[0056] Reference Figure 4 As shown, further, in another embodiment based on the previous embodiment, the carbon capture system further includes a flue gas heat exchanger 900, which directly receives the absorbent rich liquid from the absorption tower 100 and receives the flue gas 40 flowing to the absorption tower 100, so that the absorbent rich liquid from the absorption tower 100 and the flue gas 40 are heat-exchanged and then flow to the second heat exchanger 800. That is, the absorbent rich liquid from the absorption tower 100 is first heated by the flue gas in the flue gas heat exchanger 900, and then flows to the second heat exchanger 800. The subsequent description is referred to the above, and will not be repeated here.

[0057] Since the absorbent rich liquid just flowing out from the absorption tower 100 has a relatively low temperature, the flue gas is first used to heat the absorbent rich liquid in the flue gas heat exchanger 900, and then flows to the second heat exchanger 800 to effectively exchange heat with the condensed water in the reboiler 400. Therefore, by setting up the flue gas heat exchanger 900, the heat of the flue gas can be utilized to further improve the heat recovery rate.

[0058] 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 carbon capture system, comprising a regeneration tower and a reboiler, characterized in that: The carbon capture system further comprises: a first heat exchanger having a first medium flow path and a second medium flow path, wherein an inlet of the first medium flow path is communicated with an exhaust port of the regeneration tower, and the second medium flow path is used for passing liquid water to heat the liquid water using carbon dioxide gas discharged from the regeneration tower; and A heat pump device, wherein the condensate outlet of the reboiler is connected to a first pipeline, the outlet of the second medium flow path is connected to a second pipeline, the first pipeline and the second pipeline are connected to the heat source inlet of the heat pump device after merging, and the heat source outlet of the heat pump device is connected to the inlet of the second medium flow path.

2. The carbon capture system according to claim 1, characterized in that The carbon capture system comprises a drainage pipeline, which is arranged between the heat source outlet of the heat pump device and the inlet of the second medium flow path, and is used to discharge part of the liquid flowing from the heat pump device to the first heat exchanger.

3. The carbon capture system according to claim 2, characterized in that The carbon capture system comprises a flow detection device, which is arranged in a pipeline portion between the drainage pipeline and an inlet of the second medium flow path, and is used to detect a water flow rate flowing to the first heat exchanger.

4. The carbon capture system according to claim 1, characterized in that The carbon capture system includes an absorption tower, and the heat absorbing medium inlet of the heat pump device directly or indirectly receives absorbent rich liquid from the absorption tower to increase the temperature of the absorbent rich liquid.

5. The carbon capture system according to claim 4, characterized in that: The carbon capture system comprises a lean-rich liquid heat exchanger, and the heat absorbing medium inlet of the heat pump device is communicated with the rich liquid outlet of the lean-rich liquid heat exchanger, thereby indirectly receiving the absorbent rich liquid from the absorption tower.

6. The carbon capture system according to claim 4, characterized in that The carbon capture system comprises a second heat exchanger, the second heat exchanger having a third medium flow path and a fourth medium flow path, the second heat exchanger is arranged in the first pipeline, and the third medium flow path is connected to the first pipeline, so that the condensed water flowing out of the condensed water outlet passes through the third medium flow path; The inlet of the fourth medium flow path directly or indirectly receives the absorbent rich liquid from the absorption tower, and the outlet of the fourth medium flow path leads to the regeneration tower.

7. The carbon capture system according to claim 6, characterized in that The carbon capture system also includes a flue gas heat exchanger, which directly receives the absorbent rich liquid from the absorption tower and receives the flue gas flowing to the absorption tower, so that the absorbent rich liquid and the flue gas from the absorption tower flow to the second heat exchanger after heat exchange.

8. The carbon capture system according to claim 1, characterized in that A demister is provided in the regeneration tower, and the regeneration tower is configured such that the carbon dioxide gas desorbed inside the regeneration tower passes through the demister and then flows out of the regeneration tower.

9. The carbon capture system according to claim 1, characterized in that: The heat pump device is a second type absorption heat pump.

10. The carbon capture system according to claim 1, characterized in that The first heat exchanger is configured such that the water inlet temperature is greater than or equal to 55 degrees Celsius and less than or equal to 65 degrees Celsius, and the water outlet temperature is greater than or equal to 90 degrees Celsius and less than or equal to 100 degrees Celsius.

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