Desorption tower with solar reboiler

Abstract

The desorption tower with the solar reboiler comprises a desorption tower which is provided with a first inlet, a first outlet, a second inlet, a second outlet and a third outlet; the reboiler is provided with a first cavity and a second cavity, the first cavity and the second cavity are arranged in a spaced mode, an inlet of the first cavity is communicated with the second outlet, an outlet of the first cavity is communicated with the second inlet, the second cavity is communicated with a steam heat source, and steam exhausted by the steam heat source can be introduced into the second cavity; the steam in the second cavity can heat the fluid in the first cavity; and the solar heat collector comprises a light gathering piece, the light gathering piece is used for gathering sunlight, and the sunlight gathered by the light gathering piece serves as a heat source of the reboiler. Therefore, the desorption tower with the solar reboiler has the advantage of energy conservation.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide recovery, and particularly to a desorption tower with a solar reboiler. Background Art

[0002] A desorption tower is a device widely used in the chemical industry, mainly used to recover or regenerate solutions that have absorbed certain components (such as acidic gases, moisture, or other pollutants), so that these solutions can be recycled. The desorption tower requires heat energy for operation. A reboiler (also known as a re-heater) is a heating device mainly used to vaporize a liquid again in an industrial process. Its basic function is to transfer heat energy to the liquid entering it through heat exchange, causing partial evaporation of the liquid to form steam. This device is commonly found in the chemical industry and petroleum refining processes, especially when used in conjunction with a distillation column to heat the bottom liquid of the column, prompting volatile components to turn into steam and rise, thereby achieving the purpose of component separation. The structure of the reboiler is similar to that of a condenser, but its function is opposite, not to cool but to heat. It can be directly installed at the bottom of the distillation column or located outside the column and connected to the column through a siphon and a conduit. The heating medium can be steam, hot water, or other heat sources, which are selected according to specific process requirements. The design of the reboiler ensures effective heat transfer and often has a certain vaporization space to enable partial conversion of the liquid into steam. In related technologies, the reboiler needs to consume steam to heat the rich liquid in the desorption tower, thereby improving the desorption and regeneration effect of the rich liquid, consuming a large amount of extraction steam, and having high energy consumption. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. To this end, an embodiment of the present invention provides a desorption tower with a solar reboiler.

[0004] The desorption tower with a solar reboiler according to an embodiment of the present invention includes:

[0005] A desorption tower having a first inlet, a first outlet, a second inlet, a second outlet, and a third outlet. The first inlet is used for introducing carbon dioxide-rich liquid, the first outlet is located at the top of the desorption tower and is used for discharging carbon dioxide gas, and the third outlet is used for discharging carbon dioxide-lean liquid;

[0006] A reboiler having a first cavity and a second cavity. The first cavity and the second cavity are arranged at intervals. The inlet of the first cavity is communicated with the second outlet, the outlet of the first cavity is communicated with the second inlet, the second cavity is communicated with a steam heat source, the steam discharged from the steam heat source can be introduced into the second cavity, and the steam in the second cavity can heat the fluid in the first cavity;

[0007] A solar collector, the solar collector includes a concentrator for concentrating sunlight, and the sunlight concentrated by the concentrator serves as the heat source for the reboiler.

[0008] Therefore, the desorption tower with a solar reboiler according to the embodiments of the present invention has the advantage of energy conservation.

[0009] The desorption tower with a solar reboiler according to the embodiments of the present invention includes a reboiler having a first chamber and a second chamber. The first chamber and the second chamber are spaced apart and can perform heat exchange. The inlet of the first chamber communicates with the second outlet, the outlet of the first chamber communicates with the second inlet, the second chamber communicates with a steam heat source, and the steam discharged from the steam heat source can be introduced into the second chamber so that the steam in the second chamber can heat the fluid in the first chamber.

[0010] In some embodiments, the reboiler is provided on the circumferential side surface of the desorption tower, and the sunlight concentrated by the concentrator faces the reboiler.

[0011] In some embodiments, the reboiler further includes a third chamber spaced apart from the first chamber and the second chamber. The hot fluid in the second chamber can heat the rich liquid in the first chamber.

[0012] The solar collector includes a heat collection part and the concentrator. The heat collection part is provided on the housing of the reboiler. The concentrator is used to concentrate light on the heat collection part to increase the temperature of the fluid in the heat collection part. The hot fluid discharged from the heat collection part can be introduced into the third chamber, and the fluid discharged from the third chamber can be introduced into the heat collection part.

[0013] In some embodiments, the first chamber is located between the third chamber and the second chamber. The second chamber is located on the side of the first chamber facing the tower body of the desorption tower, and the third chamber is located on the side of the first chamber facing away from the tower body of the desorption tower.

[0014] In some embodiments, the inner wall surface of the housing of the reboiler defines the first chamber.

[0015] A first heat exchange tube is provided in the housing of the reboiler. The inlet of the first heat exchange tube extends out of the first chamber and communicates with the steam heat source. The outlet of the first heat exchange tube extends out of the first chamber. The inner wall surface of the first heat exchange tube defines the second chamber.

[0016] A second heat exchange tube is disposed inside the housing of the reboiler. The inlet of the second heat exchange tube extends out of the first cavity and communicates with the heat collection part, and the outlet of the second heat exchange tube extends out of the first cavity and communicates with the heat collection part. The inner wall surface of the second heat exchange tube defines the third cavity.

[0017] In some embodiments, both the first heat exchange tube and the second heat exchange tube have a plurality of bending portions.

[0018] In some embodiments, the outer peripheral contour of the tower body of the desorption tower is rectangular;

[0019] A plurality of the reboilers are provided on the outer peripheral surface of the tower body of the desorption tower;

[0020] A plurality of the condenser elements are provided on the circumferential side of the desorption tower.

[0021] In some embodiments, the condenser element includes at least one of a reflector and a lens;

[0022] The heat collection part includes at least one of a flat plate type heat collection tube and a vacuum tube type heat collection tube.

[0023] In some embodiments, the solar mounting frame is connected to at least one of the condenser elements through an adjusting frame, and the adjusting frame can adjust the light condensing direction of the condenser element connected thereto. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a desorption tower with a solar reboiler according to an embodiment of the present invention.

[0025] Figure 2 is a top view of a desorption tower with a solar reboiler according to an embodiment of the present invention.

[0026] Figure 3 is a schematic diagram of a reboiler according to an embodiment of the present invention.

[0027] Figure 4 is a schematic diagram of a reboiler according to an embodiment of the present invention.

[0028] Reference Signs:

[0029] 1. Desorption tower, 11. First inlet, 12. First outlet, 13. Second inlet, 14. Second outlet, 15. Third outlet;

[0030] 2. Reboiler, 21. First cavity, 22. Second cavity, 23. Third cavity, 24. First heat exchange tube, 25. Second heat exchange tube;

[0031] 3. Condenser element, 31. Heat collection part, 32. Solar mounting frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] The desorption tower with a solar reboiler according to an embodiment of the present invention will be described below with reference to the accompanying drawings. As Figures 1 to 4 shown, the desorption tower with a solar reboiler according to an embodiment of the present invention includes a desorption tower 1, a reboiler 2, and a solar collector.

[0034] The desorption tower 1 has a first inlet 11, a first outlet 12, a second inlet 13, a second outlet 14, and a third outlet 15. The first inlet 11 is used to introduce the carbon dioxide-rich liquid. The first outlet 12 is located at the top of the desorption tower 1 and is used to discharge carbon dioxide gas. The third outlet 15 is used to discharge the carbon dioxide-lean liquid. Specifically, the third outlet 15, the first inlet 11, and the first outlet 12 are arranged in sequence from bottom to top. After the carbon dioxide-rich liquid enters the desorption tower 1 through the first inlet 11, carbon dioxide gas is desorbed. The generated carbon dioxide gas can be discharged from the first outlet 12 at the top, and the remaining carbon dioxide-lean liquid can be discharged downward through the third outlet 15. The up-and-down direction is as shown by the arrow in the figure.

[0035] The reboiler 2 has a first cavity 21 and a second cavity 22. The first cavity 21 and the second cavity 22 are arranged at intervals and can perform heat exchange. The inlet of the first cavity 21 is communicated with the second outlet 14, and the outlet of the first cavity 21 is communicated with the second inlet 13. The second cavity 22 is communicated with a steam heat source. The steam discharged from the steam heat source can be introduced into the second cavity 22 so that the steam in the second cavity 22 can heat the fluid in the first cavity 21. Thus, the carbon dioxide-rich liquid in the desorption tower 1 can be introduced into the first cavity 21 of the reboiler 2 through the second outlet 14. The steam at the steam heat source can heat the carbon dioxide-rich liquid introduced into it through the reboiler 2 to desorb carbon dioxide gas, and then the desorbed carbon dioxide gas and the desorbed liquid are introduced into the desorption tower 1 through the second inlet 13. For example, the second inlet 13 is located above the second outlet 14, and the steam heat source is a boiler. The steam discharged from the boiler can be introduced into the second cavity 22.

[0036] The solar collector includes a concentrating member 3 for concentrating sunlight, and the sunlight concentrated by the concentrating member 3 serves as the heat source for the reboiler 2. The concentrating member 3 can concentrate sunlight and has a preset orientation so that the solar energy concentrated by the concentrating member 3 can be directed towards the reboiler 2, so that the heat energy of sunlight can be used to heat the carbon dioxide-rich liquid in the reboiler 2. Thus, the solar collector can provide heat energy for the reboiler 2. When sunlight is insufficient and cannot heat the reboiler 2 to the preset temperature, steam can be introduced into the reboiler 2 to heat the rich liquid to the preset temperature. The solar collector can reduce the amount of steam consumed by the reboiler 2, thereby saving energy.

[0037] Therefore, the desorption tower with a solar reboiler according to the embodiment of the present invention has the advantage of saving energy.

[0038] In some embodiments, there are multiple concentrating members 3, and the multiple concentrating members 3 are arranged on the solar mounting frame 32. Specifically, the solar mounting frame 32 is connected to at least one concentrating member 3 through an adjusting frame, and the adjusting frame can adjust the concentrating direction of the concentrating member 3 connected thereto. The multiple concentrating members 3 can increase the heat source provided for the reboiler 2. The adjusting frame can adjust the concentrating direction of the concentrating member 3 so that the reboiler 2 can easily receive the concentrated sunlight.

[0039] In some embodiments, the reboiler 2 is arranged on the peripheral side surface of the desorption tower 1, and the sunlight concentrated by the concentrating member 3 is directed towards the reboiler 2. Arranging the reboiler 2 on the desorption tower 1 can facilitate the reboiler 2 to absorb sunlight and can save the installation area.

[0040] As Figure 2 shown, in some embodiments, the outer peripheral contour of the tower body of the desorption tower 1 is rectangular, and a plurality of reboilers 2 are arranged on the outer peripheral surface of the tower body of the desorption tower 1. Specifically, the tower body of the desorption tower 1 is a rectangular tower body, so that multiple side surfaces of the tower body are all flat surfaces, which is convenient for installing the reboiler 2. For example, the front, back, left, and right side surfaces of the tower body of the desorption tower 1 are all flat surfaces.

[0041] A plurality of concentrating members 3 are arranged on the peripheral side of the desorption tower 1. Specifically, each of the multiple side surfaces of the desorption tower 1 has a concentrating member 3 matched therewith, so that each reboiler 2 on each side surface has a concentrating member 3 matched therewith. For example, a plurality of concentrating members 3 are arranged on the front, back, left, and right side edges of the desorption tower 1.

[0042] In some embodiments, the reboiler 2 further includes a third cavity 23, which is spaced apart from the first cavity 21 and the second cavity 22. The hot fluid in the second cavity 22 can heat the rich liquid in the first cavity 21. The solar collector includes a heat collection part 31 and a light concentrator 3. The heat collection part 31 is arranged on the housing of the reboiler 2. The light concentrator 3 is used to concentrate light on the heat collection part 31 to increase the temperature of the fluid in the heat collection part 31. The hot fluid discharged from the heat collection part 31 can be introduced into the third cavity 23, and the fluid discharged from the third cavity 23 can be introduced into the heat collection part 31. Specifically, the heat collection part 31 is arranged on one side of the reboiler 2 facing away from the tower body of the desorption tower 1. That is to say, by arranging the heat collection part 2 on the reboiler 2, the sunlight concentrated by the light concentrator 3 first heats the fluid temperature in the heat collection part 31, and then the fluid temperature in the heat collection part 31 is introduced into the third cavity 23, thereby heating the rich liquid in the first cavity 21.

[0043] In some embodiments, the light concentrator 3 includes at least one of a reflector and a lens. The heat collection part 31 includes at least one of a flat plate type heat collection tube and a vacuum tube type heat collection tube. For example, the light concentrator 3 is a combined light concentrator element (a component of a reflector and a lens). The lens is used for preliminary focusing first, and then further focused by the reflector to achieve a higher light concentration ratio. The heat collection part 31 is a flat plate type heat collection tube.

[0044] As Figure 3 shown, in some embodiments, the first cavity 21 is located between the third cavity 23 and the second cavity 22. Thus, it is convenient for the third cavity 23 and the second cavity 22 to heat the first cavity 21 located between them. The second cavity 22 is located on the side of the first cavity 21 facing the tower body of the desorption tower 1, and the third cavity 23 is located on the side of the first cavity 21 facing away from the tower body of the desorption tower 1, so that the third cavity 23 is adjacent to the heat collection part 31.

[0045] As Figure 4 shown, in some embodiments, the inner wall surface of the housing of the reboiler 2 defines the first cavity 21. A first heat exchange tube 24 is arranged in the housing of the reboiler 2. The inlet of the first heat exchange tube 24 extends out of the first cavity 21 and is communicated with a steam heat source. The outlet of the first heat exchange tube 24 extends out of the first cavity 21. The inner wall surface of the first heat exchange tube 24 defines the second cavity 22. Thus, after the steam is introduced into the first heat exchange tube 24, the first heat exchange tube 24 can heat the rich liquid in the first cavity 21, and the steam after heat exchange can be discharged from the outlet of the first heat exchange tube 24.

[0046] Inside the shell of the reboiler 2, a second heat exchange tube 25 is provided. The inlet of the second heat exchange tube 25 extends out of the first cavity 21 and communicates with the heat collection part 31, and the outlet of the second heat exchange tube 25 extends out of the first cavity 21 and communicates with the heat collection part 31. The inner wall surface of the second heat exchange tube 25 defines a third cavity 23. Thus, the hot fluid in the heat collection part 31 can be introduced into the second heat exchange tube 25, so that the second heat exchange tube 25 can heat the rich liquid in the first cavity 21, and the fluid after heat exchange can be discharged from the outlet of the second heat exchange tube 25. For example, the inlet of the second heat exchange tube 25 is located above the outlet of the second heat exchange tube 25. After the fluid discharged from the outlet of the second heat exchange tube 25 is introduced into the liquid storage tank, the liquid in the liquid storage tank is introduced into the heat collection part 31 to provide fluid for the heat collection part 31.

[0047] In some embodiments, both the first heat exchange tube 24 and the second heat exchange tube 25 have a plurality of bending parts. For example, both the first heat exchange tube 24 and the second heat exchange tube 25 have a plurality of S-shaped bending parts to improve the heat exchange efficiency.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0052] 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 connection 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 specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A desorption tower with a solar reboiler, characterized in that: include: a desorption tower, the desorption tower having a first inlet, a first outlet, a second inlet, a second outlet and a third outlet, the first inlet being used to introduce a carbon dioxide-rich liquid, the first outlet being located at the top of the desorption tower and being used to discharge carbon dioxide gas, and the third outlet being used to discharge a carbon dioxide-lean liquid; A reboiler, the reboiler comprising a first cavity and a second cavity, the first cavity and the second cavity are spaced apart and can perform heat exchange, the inlet of the first cavity is connected to the second outlet, the outlet of the first cavity is connected to the second inlet, the second cavity is connected to a steam heat source, and the steam discharged from the steam heat source can be passed into the second cavity so that the steam in the second cavity can heat the fluid in the first cavity; A solar thermal collector comprises a concentrator for concentrating sunlight, and the sunlight concentrated by the concentrator is used as a heat source for the reboiler.

2. The desorption tower with solar reboiler according to claim 1, characterized in that: There are multiple light concentrators, and the multiple light concentrators are arranged on the solar mounting frame.

3. The desorption tower with solar reboiler according to claim 2, characterized in that: The reboiler is arranged on the peripheral side of the desorption tower, and the sunlight concentrated by the concentrating element is directed toward the reboiler.

4. The desorption tower with solar reboiler according to claim 3, characterized in that: The reboiler further comprises a third chamber, the third chamber is spaced apart from the first chamber and the second chamber, and the hot fluid in the second chamber can heat the rich liquid in the first chamber; The solar thermal collector includes a heat collecting part and a light concentrator, wherein the heat collecting part is arranged on the shell of the reboiler, and the light concentrator is used to concentrate light on the heat collecting part so as to increase the fluid temperature in the heat collecting part, and the hot fluid discharged from the heat collecting part can be passed into the third cavity, and the fluid discharged from the third cavity can be passed into the heat collecting part.

5. The desorption tower with solar reboiler according to claim 4, characterized in that: The first cavity is located between the third cavity and the second cavity, the second cavity is located on the side of the first cavity facing the tower body of the desorption tower, and the third cavity is located on the side of the first cavity facing away from the tower body of the desorption tower.

6. The desorption tower with solar reboiler according to claim 4, characterized in that: The inner wall surface of the shell of the reboiler defines the first cavity; A first heat exchange tube is disposed in the shell of the reboiler, an inlet of the first heat exchange tube extends out of the first cavity and is connected to the steam heat source, an outlet of the first heat exchange tube extends out of the first cavity, and an inner wall surface of the first heat exchange tube defines the second cavity; A second heat exchange tube is provided in the shell of the reboiler, the inlet of the second heat exchange tube extends out of the first cavity and is connected to the heat collecting part, the outlet of the second heat exchange tube extends out of the first cavity and is connected to the heat collecting part, and the inner wall surface of the second heat exchange tube defines the third cavity.

7. The desorption tower with solar reboiler according to claim 6, characterized in that: The first heat exchange tube and the second heat exchange tube each have a plurality of bending portions.

8. The desorption tower with a solar reboiler according to any one of claims 1 to 7, characterized in that: The outer peripheral contour of the tower body of the desorption tower is a rectangle; A plurality of reboilers are provided on the outer peripheral surface of the tower body of the desorption tower; A plurality of light focusing members are provided on the peripheral side of the desorption tower.

9. The desorption tower with solar reboiler according to claim 8, characterized in that: The light focusing element includes at least one of a reflector and a lens; The heat collecting part includes at least one of a flat plate heat collecting tube and a vacuum tube heat collecting tube.

10. The desorption tower with solar reboiler according to claim 2, characterized in that: The solar mounting frame is connected to at least one of the light concentrators via an adjusting frame, and the adjusting frame can adjust the focusing direction of the light concentrator connected thereto.

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