Flash Tanks and CO2 Capture Systems

Abstract

The present invention relates to the technical field of carbon dioxide capture, and in particular to a flash tank and a carbon dioxide capture system, wherein the flash tank comprises a flash tank body and a heat exchange assembly, wherein the flash tank body has a flash chamber, and the heat exchange assembly comprises a heat exchange coil, wherein the heat exchange coil is arranged in the flash chamber and extends along the extension direction of the flash tank body, wherein the radius of the heat exchange coil gradually decreases along the extension direction of the flash tank body near the top of the flash tank body, wherein the heat exchange coil comprises a first chamber and a second chamber, wherein the first chamber and the second chamber are independent of each other and can perform heat exchange, wherein the first chamber is suitable for communicating with an absorbent, and the second chamber is suitable for communicating with a heat source, wherein the heat exchange coil comprises a first outlet, wherein the first outlet is communicated with the first chamber, and the first outlet is arranged adjacent to the top of the flash tank body to discharge the absorbent into the flash chamber for flash evaporation, wherein the flash tank of the embodiment of the present invention can flash the regenerated absorbent to reduce the content of carbon dioxide in the absorbent.

Description

Technical Field

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

[0002] The regeneration tower is used to regenerate the absorbent enriched with carbon dioxide. The regenerated absorbent is transferred to the absorption tower for absorption. The absorbent circulates between the absorption tower and the regeneration tower to capture carbon dioxide. In the related art, a reboiler is often used to heat the absorbent to desorb carbon dioxide. However, carbon dioxide still exists in the absorbent after desorption in the regeneration tower, which affects the absorption effect of the absorbent. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a flash tank, which can flash the regenerated absorbent to reduce the content of carbon dioxide in the absorbent.

[0004] The embodiment of the present invention also provides a carbon dioxide capture system.

[0005] A flash tank according to an embodiment of the present invention comprises: a flash tank body having a flash chamber; a heat exchange assembly, wherein the heat exchange assembly comprises a heat exchange coil, wherein the heat exchange coil is arranged in the flash chamber and extends along the extension direction of the flash tank body, wherein the radius of the heat exchange coil gradually decreases along the extension direction of the flash tank body near the top of the flash tank body, wherein the heat exchange coil has a first chamber and a second chamber, wherein the first chamber and the second chamber are independent of each other and can perform heat exchange, wherein the first chamber is suitable for communicating with an absorbent, and the second chamber is suitable for communicating with a heat source, wherein the heat exchange coil has a first outlet, wherein the first outlet is communicated with the first chamber, and wherein the first outlet is arranged adjacent to the top of the flash tank body to discharge the absorbent into the flash chamber for flash evaporation.

[0006] In this embodiment, the absorbent is transferred to the first chamber of the heat exchange coil in the flash tank body, so that the absorbent in the first chamber exchanges heat with the heat source in the second chamber, and the heated absorbent is transferred to the flash chamber for flash evaporation. Since the pressure in the flash chamber is lower than the external atmospheric pressure, the carbon dioxide in the heated absorbent can be separated from the absorbent, thereby reducing the content of carbon dioxide in the absorbent and improving the absorption effect of the absorbent.

[0007] In some embodiments, the heat exchange coil includes a plurality of heat exchange pipe segments connected in sequence, the plurality of heat exchange pipe segments are arranged in sequence in the extension direction of the flash tank body, and one end of the heat exchange pipe segment in the extension direction of the flash tank body is higher than the other end of the heat exchange pipe segment in the extension direction of the flash tank body.

[0008] In this embodiment, the multiple heat exchange pipe sections are connected in sequence, so that the absorbent can flow in the multiple heat exchange pipe sections in sequence, thereby increasing the contact area between the absorbent and the heat source and improving the heat exchange efficiency.

[0009] In some embodiments, on a projection plane parallel to the radial direction of the flash tank body, the outer contour of the heat exchange tube segment is arc-shaped, and a plurality of the heat exchange tube segments are arranged in a staggered manner.

[0010] In this embodiment, a plurality of heat exchange tube sections are staggered so that the absorbent can contact and exchange heat with the heat exchange tube sections during its downward flow, thereby facilitating secondary heating of the absorbent by the heat exchange tube sections and improving the flash evaporation effect of the absorbent.

[0011] In some embodiments, the heat exchange tube segment includes a first arc segment and a second arc segment connected in sequence, and a bending direction of the first arc segment is opposite to a bending direction of the second arc segment.

[0012] In this embodiment, the flow directions of the absorbent and the heat source in the heat exchange coil can be changed by setting the first arc segment and the second arc segment in opposite bending directions. The absorbent and the heat source flow in sequence between the first arc segment and the second arc segment of multiple heat exchange tube segments, so that the absorbent and the heat source continuously change their flow directions during the flow process, thereby improving the heat exchange performance of the heat exchange coil.

[0013] In some embodiments, the first arc segment and the second arc segment have the same diameter.

[0014] In this embodiment, the pipe diameters of the first arc segment and the second arc segment are set to be the same, so that the flow velocity and flow rate of the absorbent and the heat source when passing through the first arc segment and the second arc segment are relatively uniform, thereby reducing the pressure loss of the absorbent and the heat source in the first arc segment and the second arc segment and improving the heat exchange effect.

[0015] In some embodiments, in a cross section of the heat exchange tube section, the first chamber and the second chamber are arranged adjacent to each other, and the second chamber is adjacent to the top of the flash tank body.

[0016] In this embodiment, the second chamber is arranged above the first chamber so that the absorbent can directly contact the outer wall surface of the second chamber during the downward flow, thereby improving the secondary heating effect of the heat source on the absorbent and further improving the flash evaporation effect of the absorbent.

[0017] In some embodiments, the flash tank body includes a flash spray nozzle, the flash spray nozzle and the heat exchange coil are arranged at intervals in the extension direction of the flash tank body, and the flash spray nozzle is connected to the first outlet to spray the absorbent into the flash chamber.

[0018] In this embodiment, a flash evaporation nozzle is arranged above the heat exchange coil to spray the absorbent, thereby improving the distribution uniformity of the absorbent in the flash evaporation chamber, thereby improving the flash evaporation effect.

[0019] In some embodiments, the heat exchange assembly further includes a connecting pipe, one end of which is connected to the first outlet, and the other end of which is connected to the flash nozzle.

[0020] The carbon dioxide capture system of the embodiment of the present invention comprises: a flash tank, which is the flash tank described in the above embodiment; a regeneration tower, wherein the liquid outlet of the regeneration tower is connected to the first chamber of the heat exchange coil to transfer the regenerated absorbent to the first chamber.

[0021] The carbon dioxide capture system of the embodiment of the present invention transmits the absorbent regenerated in the regeneration tower to a flash tank for flash evaporation. The absorbent first exchanges heat with a heat source through a heat exchange coil in the flash tank, and the heated absorbent enters a flash chamber for flash evaporation, thereby facilitating the separation of the absorbent and carbon dioxide and reducing the carbon dioxide content in the absorbent.

[0022] In some embodiments, the carbon dioxide capture system further comprises a pressure regulating valve, one end of which is connected to the liquid outlet of the regeneration tower, and the other end of which is connected to the first chamber to reduce the pressure of the absorbent entering the first chamber.

[0023] The pressure regulating valve in this embodiment accurately controls the pressure of the absorbent entering the heat exchange coil, which can promote the release of carbon dioxide in the absorbent and improve the flash evaporation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a flash tank according to an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of a heat exchange coil according to an embodiment of the present invention.

[0026] Figure 3 It is a cross-sectional view of a heat exchange tube section according to an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of a carbon dioxide capture system according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] Flash tank 100, regeneration tower 200, liquid outlet 210 of the regeneration tower, pressure regulating valve 300,

[0030] Absorption tower 400, liquid outlet 410 of the absorption tower, heat exchanger 500,

[0031] Flash tank body 1, flash chamber 11, flash nozzle 12, gas outlet 13, concentration outlet 14,

[0032] Heat exchange component 2, heat exchange coil 21, first chamber 211, second chamber 212, first outlet 213, heat exchange pipe section 214, first arc section 2141, second arc section 2142, inlet 215, second outlet 216,

[0033] Connecting pipe 22, inlet pipe 23, outlet pipe 24. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0035] The flash tank 100 of the embodiment of the present invention comprises a flash tank body 1 and a heat exchange assembly 2. The flash tank body 1 has a flash chamber 11. The heat exchange assembly 2 comprises a heat exchange coil 21, which is arranged in the flash chamber 11 and extends along the extension direction of the flash tank body 1 (such as Figure 1 The heat exchange coil 21 extends in the vertical direction as shown in the figure, the radius of the heat exchange coil 21 gradually decreases along the top of the flash tank body 1 in the extending direction of the flash tank body 1, the heat exchange coil 21 has a first chamber 211 and a second chamber 212, the first chamber 211 and the second chamber 212 are independent of each other and can exchange heat, the first chamber 211 is suitable for communicating with the absorbent, and the second chamber 212 is suitable for communicating with the heat source, the heat exchange coil 21 has a first outlet 213, the first outlet 213 is communicated with the first chamber 211, and the first outlet 213 is arranged near the top of the flash tank body 1 to discharge the absorbent into the flash chamber 11 for flash evaporation.

[0036] Specifically, if Figure 1-Figure 3 As shown, the radius of the heat exchange coil 21 gradually decreases from the bottom of the heat exchange coil 21 to the top of the heat exchange coil 21, and gradually extends upward in a spiral shape. The heat exchange coil 21 has an inlet 215, and the inlet 215 includes a first inlet and a second inlet. The first inlet and the second inlet are located at the bottom of the heat exchange coil 21. The first inlet is connected to the first chamber 211 to transfer the absorbent to the first chamber 211, and the second inlet is connected to the second chamber 212 to transfer the heat source to the second chamber 212. The absorbent flows upward along the heat exchange coil 21 in the first chamber 211, and the heat source flows upward along the heat exchange coil 21 in the second chamber 212. The absorbent in the first chamber 211 exchanges heat with the heat source in the second chamber 212, and the temperature of the absorbent increases, while the temperature of the heat source decreases.

[0037] The heat exchange assembly 2 also includes an inlet pipe 23, which includes a first inlet pipe and a second inlet pipe. One end of the first inlet pipe at least partially extends into the flash chamber 11 and is connected to the first inlet, and one end of the second inlet pipe at least partially extends into the flash chamber 11 and is connected to the second inlet.

[0038] The heat exchange coil 21 has a second outlet 216 . The second outlet 216 and the first outlet 213 are located at the top of the heat exchange coil 21 . The second outlet 216 is connected to the second chamber 212 to discharge the heat source after heat exchange.

[0039] The heat exchange assembly 2 also includes an outlet pipe 24, at least part of which extends into the flash chamber 11 and communicates with the second outlet 216. The outlet pipe 24 facilitates the transmission of the heat source after heat exchange in the second chamber 212 to the outside of the flash tank body 1.

[0040] The flash tank body 1 has an air outlet 13 and a concentration outlet 14. The air outlet 13 is arranged near the top of the flash tank body 1 and communicates with the flash chamber 11. The air outlet 13 is used to discharge the gas flashed out of the absorbent discharged by the heat exchange coil 21. The concentration outlet 14 is arranged near the bottom of the flash tank body 1 and communicates with the outside and the flash chamber 11. The concentration outlet 14 is used to discharge the absorbent after flashing.

[0041] For example, the heat source is water vapor, heat transfer oil or molten salt. In this embodiment, the heat source is water vapor, and the absorbent can be heated in the heat exchange coil 21 to a temperature around the boiling point.

[0042] For example, the heat exchange coil 21 is disposed between the maximum liquid level of the flash tank and the inlet pipe 23 to ensure the efficiency of the heat exchange coil 21. The maximum liquid level of the flash tank is determined according to different flash tanks.

[0043] In this embodiment, the absorbent after desorption from the regeneration tower 200 enters the first chamber 211 through the first inlet to exchange heat with the heat source in the second chamber 212. The absorbent after heat exchange is discharged from the heat exchange coil 21 through the first outlet 213 and enters the flash chamber 11 for flash evaporation. Since the pressure in the flash chamber 11 is lower than the external atmospheric pressure, the heated absorbent flashes in the flash chamber 11, and carbon dioxide is desorbed from the absorbent. The carbon dioxide is discharged through the gas outlet 13 at the top of the flash tank body 1. The concentrated absorbent after flash evaporation flows downward under the action of gravity and is discharged through the concentration outlet 14 at the bottom of the flash tank body 1, thereby realizing flash evaporation of the regenerated absorbent to reduce the content of carbon dioxide in the absorbent and improve the absorption effect of the absorbent.

[0044] Furthermore, in this embodiment, by arranging the heat exchange coil 21 in the flash chamber 11, on the one hand, the footprint of the heat exchange device can be reduced, and on the other hand, during the downward flow of the concentrated absorbent, it will contact the outer wall of the heat exchange coil 21 for secondary heat exchange, and the absorbent will be further heated and vaporized, which can improve the flash evaporation effect.

[0045] In some embodiments, the heat exchange coil 21 includes a plurality of heat exchange pipe segments 214 connected in sequence, the plurality of heat exchange pipe segments 214 are arranged in sequence in the extension direction of the flash tank body 1, and one end of the heat exchange pipe segment 214 in the extension direction of the flash tank body 1 is higher than the other end of the heat exchange pipe segment 214 in the extension direction of the flash tank body 1.

[0046] Specifically, if Figure 1 As shown, multiple heat exchange pipe segments 214 are arranged in sequence in the up and down directions, and the multiple heat exchange pipe segments 214 are connected in sequence, so that the absorbent and the heat source can flow in the multiple heat exchange pipe segments 214, increasing the contact area between the absorbent and the heat source, thereby improving the heat exchange efficiency.

[0047] For example, coil support columns are set in the flash chamber 11 to fix the heat exchange coil 21 in the flash chamber 11. The number of coil support columns is determined according to the diameter of the flash tank. The coil support columns improve the stability of the heat exchange coil 21 by supporting multiple heat exchange tube sections 214 respectively.

[0048] For example, the spacing distance between two adjacent heat exchange tube segments 214 in the left-right direction can be determined based on heat transfer calculations and simulations to ensure the feed temperature and contact area.

[0049] In this embodiment, the upper end of the heat exchange tube segment 214 is set to be higher than the lower end of the heat exchange tube segment 214, and the radius of the lower heat exchange tube segment 214 of two adjacent heat exchange tube segments 214 is larger than the radius of the upper heat exchange tube segment 214, so that the heat exchange coil 21 presents a spiral ascending arrangement, which facilitates the absorbent and the heat source to flow upward along the spiral direction of the heat exchange tube coil, and further facilitates the transfer of the absorbent to the top of the flash tank body 1 for flash evaporation.

[0050] For example, the plurality of heat exchange tube segments 214 are integrally formed coils.

[0051] For example, the number of the heat exchange pipe segments 214 is not limited in this embodiment, and the number of the heat exchange pipe segments 214 can be specifically limited according to different heat exchange requirements.

[0052] In some embodiments, on a projection plane parallel to the radial direction of the flash tank body 1 , the outer contour of the heat exchange tube segment 214 is arc-shaped, and a plurality of heat exchange tube segments 214 are arranged in a staggered manner.

[0053] Specifically, if Figure 2As shown, the inner and outer contours of the heat exchange tube segment 214 are both arc-shaped, and the spacing distances between the multiple heat exchange tube segments 214 in the radial direction of the flash tank body 1 are the same. Through the staggered arrangement of the multiple heat exchange tube segments 214, the absorbent can contact and exchange heat with the heat exchange tube segments 214 during the downward flow, which is convenient for the secondary heating of the absorbent and improves the flash evaporation effect of the absorbent.

[0054] Furthermore, in two adjacent heat exchange tube segments 214, the temperature of the heat source in the second chamber 212 of the heat exchange tube segment 214 located at the bottom is greater than the temperature of the heat source in the second chamber 212 of the heat exchange tube segment 214 located at the top. That is to say, in the process of the absorbent flowing downward, in the radial direction of the flash tank body 1, the temperature of the heat exchange tube segment 214 contacted by the absorbent located on the outside will be higher than the temperature of the heat exchange tube segment 214 contacted by the absorbent on the inside. Accordingly, the lower the position of the heat exchange tube segment 214 is, the heat energy loss of the absorbent during the flow process can be compensated, so that the heat exchange tube segments 214 at different heights can be secondary heated with the absorbent at different positions, thereby improving the flash evaporation effect of the absorbent.

[0055] In some embodiments, the heat exchange tube segment 214 includes a first arc segment 2141 and a second arc segment 2142 which are connected in sequence, and the bending direction of the first arc segment 2141 is opposite to the bending direction of the second arc segment 2142 .

[0056] Specifically, Figure 1 As shown, the first arc segment 2141 and the second arc segment 2142 are arranged relatively to each other in the radial direction of the flash tank body 1. The arrangement of the arc segments can increase the contact area between the absorbent and the heat source, thereby improving the heat exchange effect.

[0057] Moreover, the arrangement of the first arc segment 2141 and the second arc segment 2142 with opposite bending directions can change the flow direction of the absorbent and the heat source in the heat exchange coil 21. By allowing the absorbent and the heat source to flow sequentially between the first arc segment 2141 and the second arc segment 2142 of multiple heat exchange tube segments 214, the absorbent and the heat source can continuously change their flow direction during the flow process, thereby improving the heat exchange performance of the heat exchange coil 21.

[0058] In some embodiments, the first arc segment 2141 and the second arc segment 2142 have the same diameter.

[0059] In this embodiment, by setting the pipe diameters of the first arc segment 2141 and the second arc segment 2142 to be the same, the flow velocity and flow rate of the absorbent and the heat source are relatively uniform when passing through the first arc segment 2141 and the second arc segment 2142, thereby reducing the pressure loss of the absorbent and the heat source in the first arc segment 2141 and the second arc segment 2142 and improving the heat exchange effect.

[0060] In some embodiments, in the cross section of the heat exchange tube segment 214 , the first chamber 211 and the second chamber 212 are arranged adjacent to each other, and the second chamber 212 is adjacent to the top of the flash tank body 1 .

[0061] Specifically, Figure 3 As shown, the first chamber 211 and the second chamber 212 are arranged adjacent to each other in the up and down directions. By arranging the second chamber 212 above the first chamber 211, the absorbent can directly contact the outer wall surface of the second chamber 212 during the downward flow process, thereby improving the secondary heating effect of the heat source on the absorbent, thereby improving the flash evaporation effect of the absorbent.

[0062] For example, the volumes of the first chamber 211 and the second chamber 212 are the same, or the volume of the first chamber 211 is larger than the volume of the second chamber 212, or the volume of the first chamber 211 is smaller than the volume of the second chamber 212. In this embodiment, the volumes of the first chamber 211 and the second chamber 212 are not specifically limited, and the specific volume shall be based on actual needs.

[0063] In some embodiments, the flash tank body 1 includes a flash nozzle 12 , which is spaced apart from the heat exchange coil 21 in the extension direction of the flash tank body 1 , and the flash nozzle 12 is connected to the first outlet 213 to spray the absorbent into the flash chamber 11 .

[0064] Specifically, Figure 1 As shown, the flash nozzle 12 is connected to the inner wall surface of the flash tank body 1 to fix the flash nozzle 12 in the flash chamber 11. By arranging the flash nozzle 12 above the heat exchange coil 21 and connecting the flash nozzle 12 with the first chamber 211 through the first outlet 213, it is convenient for the flash nozzle 12 to spray the absorbent into the flash chamber 11, and the absorbent is partially evaporated under the low pressure environment of the flash chamber 11.

[0065] For example, the number of flash evaporation nozzles 12 is set to be multiple, and the multiple flash evaporation nozzles 12 are evenly spaced in the circumferential direction of the flash tank body 1. Through the arrangement of the multiple flash evaporation nozzles 12, the absorbent can be evenly distributed in the flash evaporation chamber 11, thereby improving the flash evaporation effect of the absorbent.

[0066] In some embodiments, the heat exchange assembly 2 further includes a connecting pipe 22 , one end of the connecting pipe 22 is connected to the first outlet 213 , and the other end of the connecting pipe 22 is connected to the flash nozzle 12 .

[0067] Specifically, Figure 1 As shown, at least part of the connecting pipe 22 is located outside the flash tank body 1, the lower end of the connecting pipe 22 extends into the flash tank body 1 and communicates with the first outlet 213, and the upper end of the connecting pipe 22 extends into the flash tank body 1 and communicates with the flash nozzle 12. The setting of the connecting pipe 22 facilitates the connection between the heat exchange coil 21 and the flash nozzle 12.

[0068] In this embodiment, by arranging the connecting pipe 22 outside the flash tank body 1, the absorbent is transferred to the outside of the flash tank body 1 and then transferred to the flash tank body 1 for injection. The connecting pipe 22 can be connected to an external flow regulating device to adjust the flow of the absorbent in the connecting pipe 22, so as to match the flow of the absorbent with the steam volume, thereby realizing the setting of different preheating temperatures under different working conditions and improving adaptability.

[0069] The carbon dioxide capture system of the embodiment of the present invention comprises a flash tank 100 and a regeneration tower 200. The flash tank 100 is the flash tank 100 of the above embodiment. The liquid outlet 210 of the regeneration tower is connected to the first chamber 211 of the heat exchange coil 21 to transfer the regenerated absorbent to the first chamber 211.

[0070] Specifically, if Figure 4 As shown, the liquid outlet 210 of the regeneration tower is used to discharge the regenerated absorbent, and the liquid outlet 210 of the regeneration tower is connected to the first chamber 211 of the heat exchange coil 21 to transfer the absorbent regenerated from the regeneration tower 200 to the heat exchange coil 21. The absorbent is heated by the heat exchange coil 21 and then transferred to the flash chamber 11. The absorbent is flashed by the low-pressure environment of the flash chamber 11, and the boiling point of the absorbent is reduced, which facilitates the separation of carbon dioxide from the absorbent, reduces the content of carbon dioxide in the absorbent, and improves the absorption effect of the absorbent.

[0071] Optionally, the gas flashed from the absorbent in the flash tank 100 can be transmitted to the regeneration tower 200, mixed with the carbon dioxide desorbed in the regeneration tower 200 and flowed upward, so as to facilitate the reuse of the waste heat of the flashed gas and the subsequent treatment of the flashed gas.

[0072] Optionally, the carbon dioxide capture system further includes an absorption tower 400 and a heat exchanger 500. The lean liquid absorbent after flash evaporation in the flash tank 100 is transferred to the heat exchanger 500 for heat exchange with the rich liquid absorbent transferred to the heat exchanger 500 through the liquid outlet 410 of the absorption tower. The lean liquid absorbent is cooled in the heat exchanger 500 and then transferred to the absorption tower 400 for absorption. The rich liquid absorbent is heated in the heat exchanger 500 and then transferred to the regeneration tower 200 for regeneration. The absorbent circulates between the absorption tower 400 and the regeneration tower 200 to improve the carbon dioxide capture efficiency.

[0073] In some embodiments, the carbon dioxide capture system further includes a pressure regulating valve 300 , one end of which is connected to the liquid outlet 210 of the regeneration tower, and the other end of which is connected to the first chamber 211 to reduce the pressure of the absorbent entering the first chamber 211 .

[0074] Specifically, the inlet end of the pressure regulating valve 300 is connected to the liquid outlet 210 of the regeneration tower, and the outlet end of the pressure regulating valve 300 is connected to the first chamber 211 of the heat exchange coil 21. The pressure of the absorbent entering the heat exchange coil 21 is precisely controlled by the pressure regulating valve 300, which can promote the release of carbon dioxide in the absorbent and improve the flash evaporation effect.

[0075] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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 limiting the present invention.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0079] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] It is to be understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A flash tank, characterized in that: include: A flash tank body, wherein the flash tank body has a flash chamber; A heat exchange component, wherein the heat exchange component comprises a heat exchange coil, the heat exchange coil is arranged in the flash chamber and extends along the extension direction of the flash tank body, the spiral radius of the heat exchange coil gradually decreases toward the top of the flash tank body in the extension direction of the flash tank body, the heat exchange coil has a first chamber and a second chamber, the first chamber and the second chamber are independent of each other and can perform heat exchange, the first chamber is communicated with an absorbent, and the second chamber is communicated with a heat source, the heat exchange coil has a first outlet, the first outlet is communicated with the first chamber, and the first outlet is arranged adjacent to the top of the flash tank body to discharge the absorbent into the flash chamber for flash evaporation; The heat exchange coil has an inlet, the inlet includes a first inlet and a second inlet, the first inlet and the second inlet are located at the bottom of the heat exchange coil, the first inlet is connected to the first chamber to transfer the absorbent to the first chamber, and the second inlet is connected to the second chamber to transfer the heat source to the second chamber; The heat exchange coil comprises a plurality of heat exchange pipe sections connected in sequence. On the cross section of the heat exchange pipe section, the first chamber and the second chamber are arranged adjacent to each other in the up and down direction, and the second chamber is adjacent to the top of the flash tank body.

2. The flash tank according to claim 1, characterized in that: The plurality of heat exchange tube segments are sequentially arranged in the extension direction of the flash tank body, and one end of the heat exchange tube segment in the extension direction of the flash tank body is higher than the other end of the heat exchange tube segment in the extension direction of the flash tank body.

3. The flash tank according to claim 2, characterized in that: On a projection plane parallel to the radial direction of the flash tank body, the outer contour of the heat exchange pipe segment is arc-shaped, and a plurality of the heat exchange pipe segments are arranged in a staggered manner.

4. The flash tank according to claim 2, characterized in that: The heat exchange tube segment includes a first arc segment and a second arc segment connected in sequence, and a bending direction of the first arc segment is opposite to a bending direction of the second arc segment.

5. The flash tank according to claim 4, characterized in that: The first arc segment and the second arc segment have the same tube diameter.

6. The flash tank according to any one of claims 1 to 5, characterized in that: The flash tank body comprises a flash spray head, the flash spray head and the heat exchange coil are arranged at intervals in the extension direction of the flash tank body, and the flash spray head is connected to the first outlet to spray the absorbent into the flash chamber.

7. The flash tank according to claim 6, characterized in that: The heat exchange assembly further includes a connecting pipe, one end of which is connected to the first outlet, and the other end of which is connected to the flash nozzle.

8. A carbon dioxide capture system, characterized in that: include: A flash tank, wherein the flash tank is the flash tank described in any one of claims 1 to 7; A regeneration tower, wherein a liquid outlet of the regeneration tower is communicated with the first chamber of the heat exchange coil to transfer the regenerated absorbent to the first chamber.

9. The carbon dioxide capture system according to claim 8, characterized in that It also includes a pressure regulating valve, one end of which is connected to the liquid outlet of the regeneration tower, and the other end of which is connected to the first chamber to reduce the pressure of the absorbent entering the first chamber.

Images