Absorption tower

Abstract

This invention provides an absorption tower, comprising: an inlet section with a flue gas inlet; an absorption section above the inlet section, containing an absorbent bed and a reflux port; a scrubbing section above the absorption section, connected to the absorption section, containing a spray assembly and a liquid outlet; an outlet section with a flue gas outlet communicating with the scrubbing section at its upper end; and a recovery assembly including a connecting pipe, the first end of which is connected to the liquid outlet, and the second end of which is connected to the reflux port, to discharge liquid from the scrubbing section into the absorption section. The technical solution provided in this application solves the problems in related technologies where, when absorbent is introduced into a carbon dioxide absorption tower, some absorbent is released into the air with the flue gas, causing air pollution and absorbent loss.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and more specifically, to an absorption tower. Background Technology

[0002] A carbon dioxide absorption tower is a device used in industrial processes. Due to the large-scale emission of carbon dioxide, which has led to global warming, it is necessary to capture carbon dioxide in flue gas to reduce carbon emissions.

[0003] Among related technologies, amine absorption is the most mature and widely used carbon capture technology. Amine molecules react chemically with carbon dioxide within the absorption tower, absorbing the carbon dioxide from the feed gas. The decarbonized flue gas is then discharged from the top of the absorption tower. In the absorption tower, the gas mixture and liquid absorbent come into countercurrent contact. Carbon dioxide dissolves or reacts chemically with the liquid, thus being absorbed. This process can be achieved through physical or chemical absorption, which not only helps reduce greenhouse gas emissions but also improves resource recovery and reuse.

[0004] However, in the related technologies, when an absorbent is introduced into the carbon dioxide absorption tower, it mixes with the flue gas. Some of the absorbent is emitted into the air with the flue gas, causing air pollution and also resulting in absorbent loss. Summary of the Invention

[0005] This invention provides an absorption tower to solve the problems in related technologies where absorbent is introduced into a carbon dioxide absorption tower, and after the absorbent is mixed with flue gas, some of the absorbent is emitted into the air with the flue gas, causing air pollution and also causing absorbent loss.

[0006] This invention provides an absorption tower, comprising: an inlet section with a flue gas inlet at its lower end; an absorption section above the inlet section, having an absorbent bed connected to the flue gas inlet and a reflux port; a scrubbing section above the absorption section and connected to it, having a spray assembly and a liquid outlet; an outlet section with a flue gas outlet connected to the scrubbing section at its upper end; and a recovery assembly including a connecting pipe, a first end of which is connected to the liquid outlet and a second end of which is connected to the reflux port, to discharge liquid from the scrubbing section into the absorption section.

[0007] Furthermore, the absorption tower also includes a first nozzle disposed within the absorption cylinder section. The first nozzle is positioned above the absorbent bed, and the second end of the connecting pipe is connected to the first nozzle via a reflux port.

[0008] Furthermore, the recycling assembly also includes a pump body, which is mounted on the connecting pipe.

[0009] Furthermore, a separation component is provided inside the washing drum section. The separation component is connected to the washing drum section to separate the gas and the liquid. The separation component has a first air inlet, a first exhaust outlet and a first liquid outlet. The first air inlet is connected to the outlet of the washing drum section, the first exhaust outlet is connected to the flue gas outlet and the first liquid outlet is connected to the liquid outlet.

[0010] Furthermore, the separation assembly includes a gas-liquid separation cylinder and a plurality of gas-liquid separators disposed in the receiving cavity of the gas-liquid separation cylinder. A first air inlet, a first exhaust outlet, and a first liquid outlet are all disposed on the gas-liquid separation cylinder. Each gas-liquid separator has a second air inlet, a second exhaust outlet, and a second liquid outlet. The second air inlet is connected to the first air inlet, the second liquid outlet is connected to the first liquid outlet, and the second exhaust outlet is connected to the first exhaust outlet.

[0011] Furthermore, the washing drum section is arranged around the outer periphery of the separation component.

[0012] Furthermore, the absorption tower also includes a fixed plate, which is disposed between the washing cylinder section and the absorption cylinder section. The outer edge of the fixed plate is connected to the inner wall of the washing cylinder section. The gas-liquid separation cylinder is disposed on the fixed plate. The fixed plate is provided with connecting holes, which are positioned corresponding to the spray assembly to connect the absorption cylinder section and the washing cylinder section.

[0013] Furthermore, the spray assembly includes a sealing plate, a first connecting pipe, and multiple second nozzles. The sealing plate is located above the first air inlet. The outer edge of the sealing plate is connected to the inner wall of the washing drum section, and the inner edge of the sealing plate is connected to the outer wall of the gas-liquid separation drum. Multiple second nozzles are spaced apart on the sealing plate. One end of the first connecting pipe is connected to the multiple second nozzles, and the other end of the first connecting pipe is connected to the liquid outlet.

[0014] Furthermore, the absorption tower also includes a third nozzle and a second connecting pipe. The third nozzle is spaced above the absorbent bed and is staggered with the first nozzle. The first end of the second connecting pipe is connected to the third nozzle, and the second end of the second connecting pipe is connected to the absorbent storage tank.

[0015] Furthermore, the absorbent bed has a honeycomb structure and is made of stainless steel.

[0016] According to the technical solution of this invention, the absorption tower includes an inlet section, an absorption section, a washing section, an outlet section, and a recovery assembly. Flue gas is discharged into the inlet section through the flue gas inlet. The absorption section is positioned above the inlet section, allowing the flue gas in the inlet section to pass through the absorbent bed within the absorption section to absorb carbon dioxide. The washing section is positioned above the absorption section and is connected to it. A spray assembly within the washing section sprays and washes the flue gas entering the washing section. The washed liquid is discharged through the liquid outlet. The outlet section is connected to the washing section, and the washed flue gas is discharged through the flue gas outlet of the outlet section. After the flue gas is absorbed by the absorbent bed in the absorption section, the flue gas will contain absorbent. The spray assembly in the washing section can wash away the absorbent from the flue gas, thus preventing the absorbent mixed in the flue gas from being directly discharged to the outside, thereby avoiding environmental pollution. Furthermore, to avoid waste of the absorbent after cleaning the flue gas, a recovery assembly is installed. The first end of the connecting pipe in the recovery assembly is connected to the liquid outlet, and the second end of the connecting pipe is connected to the reflux port. This allows the liquid sprayed on the washing cylinder section to be discharged into the connecting pipe through the liquid outlet, and then discharged into the reflux port through the connecting pipe, and finally flowed into the absorption cylinder section. This avoids absorbent loss and improves the practicality and structural reliability of the absorption tower. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of an absorption tower provided according to an embodiment of the present invention is shown.

[0019] The above figures include the following reference numerals:

[0020] 10. Intake section; 11. Flue gas inlet;

[0021] 20. Absorption section; 21. Absorbent bed; 22. Return port;

[0022] 30. Washing drum section; 31. Liquid outlet; 32. Separation assembly; 321. Gas-liquid separator drum; 322. Gas-liquid separator; 33. Fixing plate;

[0023] 40. Exhaust pipe section; 41. Flue gas outlet;

[0024] 50. Recycling component; 51. Connecting pipe; 52. Pump body. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figure 1 As shown, this embodiment of the invention provides an absorption tower, which includes an inlet section 10, an absorption section 20, a scrubbing section 30, an outlet section 40, and a recovery assembly 50. A flue gas inlet 11 is provided at the lower end of the inlet section 10. The absorption section 20 is located above the inlet section 10 and contains an absorbent bed 21 connected to the flue gas inlet 11. A reflux port 22 is provided on the absorption section 20. The scrubbing section 30 is located within the absorption section 20. Above, the washing section 30 is connected to the absorption section 20. A spray assembly is installed inside the washing section 30. A liquid outlet 31 is installed on the washing section 30. A flue gas outlet 41 connected to the washing section 30 is installed at the upper end of the gas outlet section 40. The recovery assembly 50 includes a connecting pipe 51. The first end of the connecting pipe 51 is connected to the liquid outlet 31, and the second end of the connecting pipe 51 is connected to the return port 22 to discharge the liquid in the washing section 30 into the absorption section 20.

[0027] The absorption tower provided in this embodiment includes an inlet section 10, an absorption section 20, a scrubbing section 30, an outlet section 40, and a recovery assembly 50. Flue gas is discharged into the inlet section 10 through the flue gas inlet 11. The absorption section 20 is positioned above the inlet section 10, allowing the flue gas in the inlet section 10 to pass through the absorbent bed 21 within the absorption section 20 to absorb carbon dioxide. The scrubbing section 30 is positioned above the absorption section 20 and is connected to the absorption section 20, utilizing the scrubbing cylinder... The spray assembly in section 30 sprays and washes the flue gas entering the washing cylinder section 30. The washed liquid is discharged through the liquid outlet 31. The exhaust cylinder section 40 is connected to the washing cylinder section 30, and the flue gas washed in the washing cylinder section 30 is discharged through the flue gas outlet 41 of the exhaust cylinder section 40. After the flue gas is absorbed by the absorbent bed 21 in the absorption cylinder section 20, the flue gas will contain absorbent. The spray assembly in the washing cylinder section 30 can wash off the absorbent in the flue gas, thereby preventing the absorbent mixed in the flue gas from being directly discharged to the outside, thus avoiding environmental pollution. Furthermore, to avoid waste of the absorbent after cleaning the flue gas, a recovery assembly 50 is provided. The first end of the connecting pipe 51 in the recovery assembly 50 is connected to the liquid outlet 31, and the second end of the connecting pipe 51 is connected to the return port 22. This allows the liquid sprayed on the washing cylinder section 30 to be discharged into the connecting pipe 51 through the liquid outlet 31, and then discharged into the return port 22 through the connecting pipe 51, thereby flowing the liquid into the absorption cylinder section 20. This avoids absorbent loss and improves the practicality and structural reliability of the absorption tower.

[0028] like Figure 1 As shown, the absorption tower also includes a first nozzle disposed within the absorption section 20, positioned above the absorbent bed 21. The second end of the connecting pipe 51 is connected to the first nozzle via a return port 22. With this structure, by providing the first nozzle within the absorption section 20, positioned above the absorbent bed 21, the sprayed liquid from the washing section 30 flows back into the absorption section 20 through the recovery assembly 50 and the return port 22 of the absorption section 20, thus allowing the sprayed liquid to flow back into the absorption section 20.

[0029] like Figure 1 As shown, the recovery assembly 50 also includes a pump body 52, which is mounted on the connecting pipe 51. By using the pump body 52, the liquid in the connecting pipe 51 can be discharged into the absorption cylinder section 20.

[0030] like Figure 1As shown, a separation component 32 is provided inside the washing drum section 30. The separation component 32 is connected to the washing drum section 30 to separate gas and liquid. The separation component 32 has a first air inlet, a first exhaust outlet and a first liquid outlet. The first air inlet is connected to the outlet of the washing drum section 30, the first exhaust outlet is connected to the flue gas outlet 41, and the first liquid outlet is connected to the liquid outlet 31. With the above structure, a separation component 32 is installed inside the washing section 30. The separation component 32 is located above the absorption section 20. The first air inlet of the separation component 32 is connected to the outlet of the washing section 30, so that the cleaned flue gas is discharged into the separation component 32 through the first air inlet. The separation component 32 performs gas-liquid separation on the cleaned flue gas. The separated pure gas is discharged into the flue gas inlet 11 through the first exhaust port, and the separated liquid is connected to the outside of the absorption tower through the first liquid outlet. In this way, the absorption section 20 absorbs carbon dioxide in the flue gas, and then the washing section 30 cleans the flue gas after absorbing carbon dioxide and cleans the absorbent in the flue gas. The cleaned flue gas is discharged into the separation component 32 to achieve gas-liquid separation. This can ensure that the discharged flue gas is pure flue gas, achieve the effect of gas-liquid separation of flue gas, and thus avoid absorbent loss.

[0031] like Figure 1 As shown, the separation assembly 32 includes a gas-liquid separation cylinder 321 and a plurality of gas-liquid separators 322 disposed in the receiving cavity of the gas-liquid separation cylinder 321. A first air inlet, a first exhaust port and a first liquid outlet are all disposed on the gas-liquid separation cylinder 321. Each gas-liquid separator 322 has a second air inlet, a second exhaust port and a second liquid outlet. The second air inlet is connected to the first air inlet, the second liquid outlet is connected to the first liquid outlet and the second exhaust port is connected to the first exhaust port. With the above structure, the gas-liquid separation cylinder 321 is equipped with multiple gas-liquid separators 322. The second air inlet of each gas-liquid separator 322 is connected to the first air inlet of the gas-liquid separation cylinder 321. This allows the cleaned flue gas to be discharged into the multiple gas-liquid separators 322. The second liquid outlet of each gas-liquid separator 322 is connected to the first liquid outlet. This allows the liquid after gas-liquid separation in the gas-liquid separator 322 to be discharged into the recovery component 50 through the second liquid outlet and the first liquid outlet. The gas after gas-liquid separation in the gas-liquid separator 322 is discharged into the outside through the second exhaust outlet and the first exhaust outlet. Thus, gas-liquid separation can be performed using the separation component 32.

[0032] It should be noted that the gas-liquid separator 322 is equipped with a spiral channel and an exhaust pipe. The inlet of the spiral channel is located above the outlet of the spiral channel, and the outlet of the exhaust pipe is located above the inlet of the exhaust pipe. The inlet of the spiral channel is connected to the second air inlet, the outlet of the spiral channel is connected to the inlet of the exhaust pipe, and the outlet of the exhaust pipe is connected to the second exhaust port.

[0033] like Figure 1 As shown, the washing drum section 30 is arranged around the outer periphery of the separation component 32. By arranging the washing drum section 30 around the outer periphery of the separation component 32, the utilization rate of the absorption tower can be improved, the height of the absorption tower can be reduced, and production costs can be decreased.

[0034] like Figure 1 As shown, the absorption tower also includes a fixing plate 33, which is disposed between the washing cylinder section 30 and the absorption cylinder section 20. The outer edge of the fixing plate 33 is connected to the inner wall of the washing cylinder section 30. The gas-liquid separation cylinder 321 is disposed on the fixing plate 33. The fixing plate 33 is provided with a connecting hole, which is positioned corresponding to the spray assembly to connect the absorption cylinder section 20 and the washing cylinder section 30. With the above structure, by providing a fixing plate 33 between the absorption cylinder section 20 and the washing cylinder section 30, the gas-liquid separation cylinder 321 can be disposed on the fixing plate 33. The connecting hole on the fixing plate 33 facilitates the connection between the absorption cylinder section 20 and the washing cylinder section 30. The flue gas in the absorption cylinder section 20 is discharged into the washing cylinder section 30 through the connecting hole. The fixing plate 33 provides support and fixation for the gas-liquid separation cylinder 321 and also connects the absorption cylinder section 20 and the washing cylinder section 30 through the connecting hole.

[0035] In this embodiment, the spray assembly includes a sealing plate, a first connecting pipe, and multiple second nozzles. The sealing plate is located above the first air inlet. The outer edge of the sealing plate is connected to the inner wall of the washing cylinder section 30, and the inner edge of the sealing plate is connected to the outer wall of the gas-liquid separation cylinder 321. The multiple second nozzles are spaced apart on the sealing plate. One end of the first connecting pipe is connected to the multiple second nozzles, and the other end of the first connecting pipe is connected to the liquid outlet 31. With the above structure, a sealing plate is provided above the first air inlet, and multiple first nozzles and a connecting pipe are provided on the sealing plate. Thus, the multiple first nozzles on the sealing plate can be connected to an external water source through the connecting pipe, thereby enabling spraying to wash the flue gas.

[0036] In this embodiment, the absorption tower further includes a third nozzle and a second connecting pipe. The third nozzle is spaced above the absorbent bed 21, and the third nozzle is staggered with the first nozzle. The first end of the second connecting pipe is connected to the third nozzle, and the second end of the second connecting pipe is connected to the absorbent storage tank. With this structure, by providing a third nozzle and a second connecting pipe within the absorption tower, and by connecting the first end of the second connecting pipe to the third nozzle and the second end of the second connecting pipe to the absorbent storage tank, the absorbent in the absorbent storage tank is discharged into the third nozzle through the second connecting pipe. The absorbent is then sprayed into the absorption cylinder section 20 through the third nozzle, thereby absorbing carbon dioxide in the flue gas.

[0037] In this embodiment, the absorbent bed 21 has a honeycomb structure. Using the aforementioned absorbent bed 21 increases the contact area between the absorbent and the flue gas, thereby improving the absorption efficiency of the absorption cylinder section 20 for carbon dioxide.

[0038] In this embodiment, the absorbent bed 21 is made of stainless steel. By making the absorbent bed 21 of stainless steel, the structural strength of the absorbent section 20 can be improved.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0043] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An absorption column, characterized by The absorption tower comprises: An air inlet cylinder section (10) provided with a flue gas inlet (11) at a lower end thereof; An absorption cylinder section (20) located above the air inlet cylinder section (10), the absorption cylinder section (20) having an absorbent bed (21) therein in communication with the flue gas inlet (11), the absorption cylinder section (20) being provided with a backflow port (22) thereon; A washing cylinder section (30) located above the absorption cylinder section (20), the washing cylinder section (30) being in communication with the absorption cylinder section (20), the washing cylinder section (30) being provided with a spray assembly therein, the washing cylinder section (30) being provided with a liquid outlet (31) thereon; An air outlet cylinder section (40) provided with a flue gas outlet (41) at an upper end thereof in communication with the washing cylinder section (30); A recovery assembly (50) comprising a communication pipe (51), a first end of the communication pipe (51) being in communication with the liquid outlet (31), a second end of the communication pipe (51) being in communication with the backflow port (22) so as to discharge liquid in the washing cylinder section (30) into the absorption cylinder section (20); The washing cylinder section (30) is provided with a separation assembly (32) therein in communication with the washing cylinder section (30) so as to separate gas and liquid, the separation assembly (32) having a first gas inlet, a first gas outlet and a first liquid outlet, the first gas inlet being in communication with an outlet of the washing cylinder section (30), the first gas outlet being in communication with the flue gas outlet (41), the first liquid outlet being in communication with the liquid outlet (31); The washing cylinder section (30) surrounds an outer periphery of the separation assembly (32) and comprises a gas-liquid separation cylinder (321) and a plurality of gas-liquid separators (322) arranged in a containing cavity of the gas-liquid separation cylinder (321); The spray assembly comprises a sealing plate, a first communication pipe and a plurality of second spray heads, the sealing plate being located above the first gas inlet, an outer edge of the sealing plate being connected to an inner side wall of the washing cylinder section (30), an inner edge of the sealing plate being connected to an outer side wall of the gas-liquid separation cylinder (321), the plurality of second spray heads being arranged on the sealing plate in a spaced manner, one end of the first communication pipe being in communication with the plurality of second spray heads, the other end of the first communication pipe being in communication with the liquid outlet (31).

2. The absorption column of claim 1, wherein, The absorption tower further comprises a first spray head arranged in the absorption cylinder section (20), the first spray head being arranged above the absorbent bed (21), the second end of the communication pipe (51) being in communication with the first spray head through the backflow port (22).

3. The absorption column of claim 2, wherein, The recovery assembly (50) further comprises a pump body (52) arranged on the communication pipe (51).

4. The absorption column of claim 1, wherein, The first gas inlet, the first gas outlet and the first liquid outlet are arranged on the gas-liquid separation cylinder (321), each of the gas-liquid separators (322) has a second gas inlet, a second gas outlet and a second liquid outlet, the second gas inlet is communicated with the first gas inlet, the second liquid outlet is communicated with the first liquid outlet, and the second gas outlet is communicated with the first gas outlet.

5. The absorption column of claim 1, wherein, The absorption tower further comprises a fixing plate (33) arranged between the washing cylinder section (30) and the absorption cylinder section (20), an outer edge of the fixing plate (33) is connected with an inner side wall of the washing cylinder section (30), the gas-liquid separation cylinder (321) is arranged on the fixing plate (33), and the fixing plate (33) is provided with a communication hole corresponding to the position of the spraying assembly to communicate the absorption cylinder section (20) and the washing cylinder section (30).

6. The absorption column of claim 2, wherein, The absorption tower further comprises a third spray head and a second communication pipe, the third spray head is arranged above the absorbent bed (21) at intervals, the third spray head is arranged staggered with the first spray head, a first end of the second communication pipe is communicated with the third spray head, and a second end of the second communication pipe is communicated with an absorbent storage tank.

7. The absorption tower according to any one of claims 1 to 3, wherein, the absorbent bed (21) is in a honeycomb structure; the absorbent bed (21) is made of stainless steel.

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