Carbon dioxide capture and utilization integrated reactor

Abstract

The utility model provides a carbon dioxide capture and utilization integrated reactor. The carbon dioxide capture and utilization integrated reactor comprises a crystallization tower, an absorption tower, a conveying piece and a liquid adding unit, according to the utility model, the crystallization tower is arranged, the absorption tower is arranged in the crystallization tower, the absorption tower is embedded in the crystallization tower, and the conveying piece is communicated between the absorption tower and the crystallization tower. When the absorption tower is used, absorption liquid is added into the absorption tower through the liquid adding unit. And then the flue gas is introduced into the absorption tower, so that carbon dioxide in the flue gas reacts with the absorption liquid. Slurry absorbing carbon dioxide is pumped into the crystallization tower through the conveying piece, crystallization of the slurry can release heat, the heat in the crystallization tower can be transmitted into the absorption tower, a constant-temperature environment and heat are provided for the absorption tower, the overall occupied space of the reactor is reduced, energy consumption in the using process is reduced, and the service life of the reactor is prolonged. And the operation cost and the maintenance cost of equipment are effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas purification technology, specifically relating to an integrated reactor for carbon dioxide capture and utilization. Background Technology

[0002] Thermostatic capture and utilization of carbon dioxide (CCUS) is a commonly used technology. Taking sodium carbonate solution as an absorbent as an example, the main process involves sodium carbonate absorbing carbon dioxide from flue gas to generate sodium bicarbonate solution, which then crystallizes to obtain solid sodium bicarbonate. To ensure the optimal reaction temperature between the sodium carbonate solution and carbon dioxide, the reactor interior typically needs to be heated. This usually requires insulation or heating equipment to maintain the temperature inside the absorption tower. The on-site equipment structure is complex, occupies a large area, and consumes energy to maintain the temperature inside the absorption tower. This leads to increased operating costs and maintenance difficulties for the carbon dioxide capture equipment. Utility Model Content

[0003] This utility model provides an integrated reactor for carbon dioxide capture and utilization, which aims to solve the problems of large space occupation, high operating cost and difficult maintenance of existing carbon dioxide capture equipment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an integrated reactor for carbon dioxide capture and utilization, comprising:

[0005] Crystallization tower;

[0006] An absorption tower is installed inside the crystallization tower. The bottom of the absorption tower is connected to an inlet pipe for inputting flue gas, and the top of the absorption tower is provided with an outlet pipe.

[0007] A conveying component, connecting the absorption tower and the crystallization tower, is used to convey the slurry inside the absorption tower to the crystallization tower.

[0008] The liquid supply unit is connected to the absorption tower and is used to supply slurry into the absorption tower.

[0009] In one possible implementation, the bottom of the absorption tower is connected to an outlet pipe, the middle of the crystallization tower is connected to an inlet pipe, the height of the inlet pipe is higher than the height of the outlet pipe, the inlet end of the conveying component is connected to the outlet pipe, and the outlet end of the conveying component is connected to the inlet pipe.

[0010] In one possible implementation, the liquid addition unit includes:

[0011] An absorbent tank, with its outlet connected to the absorbent tower, is used to deliver absorbent into the absorbent tower.

[0012] A water supply pipe is connected to the absorption tower.

[0013] In one possible implementation, a spray pipe is also installed inside the absorption tower, and the spray pipe is connected to the liquid outlet of the absorption tank.

[0014] In one possible implementation, the outlet of the crystallization tower is connected to a drying system for drying the slurry inside the crystallization tower.

[0015] In one possible implementation, the crystallization tower is also connected to a lean liquid inlet for receiving the liquid separated by the drying system.

[0016] In one possible implementation, a demisting layer is installed at the flue gas outlet of the absorption tower.

[0017] In one possible implementation, the crystallization tower is equipped with a stirring mechanism for stirring the slurry, and the stirring mechanism is located below the absorption tower.

[0018] In one possible implementation, the inner wall of the crystallization tower and both the inner and outer walls of the absorption tower are provided with anti-corrosion layers.

[0019] In one possible implementation, the absorption tower is a bubbling tower or a spray tower.

[0020] The solution shown in this application, compared with the prior art, incorporates a crystallization tower, inside which an absorption tower is installed. The absorption tower is embedded within the crystallization tower, and a conveying device, a pump, connects the two towers. This pump transports the slurry from the absorption tower to the crystallization tower. In operation, absorbent is added to the absorption tower via a liquid addition unit. Flue gas is then introduced into the absorption tower, allowing carbon dioxide in the gas to react with the absorbent. The carbon dioxide-absorbing slurry is pumped into the crystallization tower via the conveying device. The crystallization of the slurry releases heat, which is then transferred to the absorption tower, providing a constant temperature environment and ensuring process stability. This approach also reduces the need for heating and insulation equipment, lowers the overall reactor footprint, and saves energy during operation, effectively reducing equipment operating and maintenance costs. Attached Figure Description

[0021] Figure 1 A schematic diagram of the integrated reactor for carbon dioxide capture and utilization provided in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the crystallization tower and absorption tower provided in the embodiments of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Crystallization tower; 11. Liquid inlet pipe; 12. Lean liquid inlet; 2. Absorption tower; 21. Flue gas inlet pipe; 22. Flue gas outlet pipe; 23. Liquid outlet pipe; 3. Conveying components; 4. Liquid addition unit; 41. Absorbent liquid tank; 411. Spray pipe; 42. Water supply pipe; 5. Drying system; 6. Demisting layer; 7. Stirring mechanism. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] Please refer to the following: Figure 1 and Figure 2 The integrated reactor for carbon dioxide capture and utilization provided by this utility model will now be described. The integrated reactor for carbon dioxide capture and utilization includes a crystallization tower 1, an absorption tower 2, a conveying component 3, and a liquid addition unit 4. The absorption tower 2 is embedded inside the crystallization tower 1. An inlet pipe 21 for inputting flue gas is connected to the bottom of the absorption tower 2, and an outlet pipe 22 is provided at the top of the absorption tower 2. The conveying component 3 connects the absorption tower 2 and the crystallization tower 1, and is used to transport the slurry inside the absorption tower 2 to the crystallization tower 1. The liquid addition unit 4 is connected to the absorption tower 2 and is used to supply slurry to the inside of the absorption tower 2.

[0027] The integrated carbon dioxide capture and utilization reactor provided in this embodiment, compared with the prior art, features a crystallization tower 1, inside which an absorption tower 2 is installed. The absorption tower 2 is embedded within the crystallization tower 1, and a conveying component 3 connects the absorption tower 2 and the crystallization tower 1. The conveying component 3 is a pump used to transport the slurry inside the absorption tower 2 to the crystallization tower 1. In this application, during use, absorbent is added to the absorption tower 2 through a liquid addition unit 4. Then, flue gas is introduced into the absorption tower 2, allowing the carbon dioxide in the flue gas to react with the absorbent. The carbon dioxide-absorbing slurry is pumped into the crystallization tower 1 through the conveying component 3. The crystallization of the slurry releases heat, which is transferred from the crystallization tower 1 to the absorption tower 2, providing a constant temperature environment and heat for the absorption tower 2, ensuring process stability, reducing heating and insulation equipment, lowering the overall space occupied by the reactor, and saving energy consumption during use, effectively reducing equipment operating and maintenance costs.

[0028] Specifically, in this embodiment, the crystallization tower 1 and the absorption tower 2 are coaxially arranged, and in the working state, the bottom of the absorption tower 2 is located below the liquid level inside the crystallization tower 1. Furthermore, the absorption tower 2 is a bubble tower, and flue gas is supplied into the absorption tower 2 through the flue gas inlet pipe 21.

[0029] Specifically, in this embodiment, the absorption tower 2 is located inside the crystallization tower 1. In the working state, the bottom of the absorption tower 2 is located below the liquid level of the slurry inside the crystallization tower 1. The distance between the lowest point of the outer wall of the absorption tower 2 and the lowest point of the inner wall of the crystallization tower 1 is 1 / 5 to 3 / 5 of the liquid level height inside the crystallization tower 1. The volume of the absorption tower 2 is 1 / 4 to 1 / 2 of the volume of the crystallization tower 1.

[0030] In some embodiments, the absorption tower 2 described above can be as follows: Figure 2 The structure shown. See also Figure 2 The bottom of the absorption tower 2 is connected to an outlet pipe 23, and the middle of the crystallization tower 1 is connected to an inlet pipe 11. The height of the inlet pipe 11 is higher than the height of the outlet pipe 23. The inlet end of the conveyor 3 is connected to the outlet pipe 23, and the outlet end of the conveyor 3 is connected to the inlet pipe 11. The outlet pipe 23 penetrates the side wall of the crystallization tower 1 and is connected to the inlet end of the conveyor 3. The height of the inlet pipe 11 on the crystallization tower 1 is higher than the height of the outlet pipe 23, and the liquid level inside the crystallization tower 1 is below the inlet pipe 11. When the slurry is transported into the crystallization tower 1 through the inlet pipe 11, it can automatically fall into the crystallization tower 1, preventing the slurry from flowing back into the conveyor 3 after it stops working. This improves safety during use.

[0031] In some embodiments, the liquid dispensing unit 4 may employ, as shown in the following example: Figure 2 The structure shown. See also Figure 2 The liquid addition unit 4 includes an absorbent tank 41 and a water supply pipe 42. The outlet of the absorbent tank 41 is connected to the absorption tower 2 for supplying absorbent to the absorption tower 2; the water supply pipe 42 is also connected to the absorption tower 2. The absorbent tank 41 stores the absorbent and delivers it to the absorption tower 2 via a pump. The water supply pipe 42 connects to an external water supply pipe, allowing water to be supplied to the absorption tower 2. This regulates the concentration of the absorbent inside the absorption tower 2.

[0032] Specifically, in this embodiment, the absorbent is one or a mixture of two of the following: sodium carbonate solution and sodium hydroxide solution.

[0033] Specifically, in this embodiment, the slurry supplied by the liquid addition unit 4 to the inside of the absorption tower 2 includes absorbent liquid and tap water.

[0034] In some embodiments, the absorption tower 2 described above can be as follows: Figure 2 The structure shown. See also Figure 2The absorber tower 2 is also equipped with a spray pipe 411, which is connected to the outlet of the absorbent liquid tank 41. The spray pipe 411 is located above the liquid level inside the absorber tower 2. When the absorbent liquid is delivered to the absorber tower 2, it can be sprayed into the absorber tower 2 through the spray pipe 411. This increases the contact area between the absorbent liquid and the flue gas, improving the absorption effect of carbon dioxide in the flue gas.

[0035] In some embodiments, the crystallization tower 1 described above can be as follows: Figure 2 The structure shown. See also Figure 2 The outlet of the crystallization tower 1 is connected to a drying system 5 for drying the slurry inside the crystallization tower 1. A discharge pipe is provided at the bottom of the crystallization tower 1 to discharge the slurry inside the crystallization tower 1, and the slurry is then dried and packaged in stages by the drying system 5.

[0036] Specifically, in this embodiment, the drying system 5 includes a hydrocyclone, a centrifuge, a dryer, a dust collector, and a finished product packaging device arranged in sequence. The feed inlet of the hydrocyclone is connected to the discharge outlet of the crystallization tower 1, and the rich liquid inside the crystallization tower 1 is transported into the hydrocyclone for step-by-step drying.

[0037] In some embodiments, the crystallization tower 1 described above can be as follows: Figure 2 The structure shown. See also Figure 2 The crystallization tower 1 is also connected to a lean liquid inlet 12 for receiving the liquid separated by the drying system 5. The lean liquid inlet 12 is also connected to the crystallization tower 1, and the lean liquid generated by the hydrocyclone and centrifuge in the drying system 5 during the drying process can be pumped back into the crystallization tower 1 for circulation treatment and circulation filtration, which effectively improves the filtration effect of the product and the recovery rate of the finished product.

[0038] In some embodiments, the absorption tower 2 described above can be as follows: Figure 2 The structure shown. See also Figure 2 A demister layer 6 is installed at the flue gas outlet pipe 22 of the absorption tower 2. The demister layer 6 is installed below the flue gas outlet pipe 22 and is used to separate liquid droplets. The flue gas outlet pipe 22 is connected to the external chimney. The demister layer 6 can reduce the evaporation of absorbent liquid with the flue gas and improve the utilization rate of absorbent liquid.

[0039] In some embodiments, the crystallization tower 1 described above can be as follows: Figure 2 The structure shown. See also Figure 2 The crystallization tower 1 is equipped with a stirring mechanism 7 for agitating the slurry, located below the absorption tower 2. The stirring mechanism 7 is situated at the bottom of the crystallization tower 1 and its operation is controlled by an external control device. The stirring mechanism 7 ensures the substances inside the crystallization tower 1 react fully, improving crystallization efficiency.

[0040] Specifically, in this embodiment, the specific structure of the stirring mechanism 7 adopts existing technology, and will not be described further here.

[0041] Specifically, in this embodiment, the stirring mechanism 7 can fully stir the slurry inside the absorption tower 2 and distribute the heat generated during the crystallization process evenly inside the absorption tower 2, ensuring uniform heat distribution inside the absorption tower 2 and a stable reaction effect inside the absorption tower 2.

[0042] In some embodiments, the crystallization tower 1 and the absorption tower 2 described above may be as follows: Figure 2 The structure shown. See also Figure 2 The inner walls of crystallization tower 1 and the inner and outer walls of absorption tower 2 are all equipped with anti-corrosion layers. An anti-corrosion layer is provided on the outer surface of absorption tower 2 that is in contact with the solution in crystallization tower 1, and an anti-corrosion layer is also provided on the inner walls of absorption tower 2 and crystallization tower 1. This can prevent the slurry from corroding crystallization tower 1 or absorption tower 2 and improve the service life of crystallization tower 1 and absorption tower 2.

[0043] In some embodiments, the absorption tower 2 described above may employ, for example... Figure 1 , Figure 2 The structure shown. See also... Figure 1 , Figure 2 Absorption tower 2 can be either a bubbling tower or a spray tower. Ready-made bubbling towers and spray towers can be used for absorption tower 2, which facilitates production and procurement. At the same time, bubbling towers and spray towers can effectively absorb carbon dioxide from flue gas during operation, improving the absorption efficiency of carbon dioxide.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated reactor for carbon dioxide capture and utilization, characterized in that, include: Crystallization tower (1) with a discharge port at the bottom; An absorption tower (2) is installed inside the crystallization tower (1). The bottom of the absorption tower (2) is connected to an inlet pipe (21) for inputting flue gas, and the top of the absorption tower (2) is provided with an outlet pipe (22). The conveying component (3) is connected between the absorption tower (2) and the crystallization tower (1) and is used to convey the slurry inside the absorption tower (2) to the crystallization tower (1); The liquid addition unit (4) is connected to the absorption tower (2) and is used to supply slurry into the absorption tower (2).

2. The integrated reactor for carbon dioxide capture and utilization as described in claim 1, characterized in that, The bottom of the absorption tower (2) is connected to an outlet pipe (23), and the middle part of the crystallization tower (1) is connected to an inlet pipe (11). The height of the inlet pipe (11) is higher than the height of the outlet pipe (23). The inlet end of the conveying component (3) is connected to the outlet pipe (23), and the outlet end of the conveying component (3) is connected to the inlet pipe (11).

3. The integrated reactor for carbon dioxide capture and utilization as described in claim 1, characterized in that, The liquid addition unit (4) includes: An absorbent tank (41) is provided with its outlet end connected to the absorbent tower (2) for conveying absorbent liquid into the absorbent tower (2); A water supply pipe (42) is connected to the absorption tower (2).

4. The integrated reactor for carbon dioxide capture and utilization as described in claim 3, characterized in that, The absorption tower (2) is also equipped with a spray pipe (411), which is connected to the liquid outlet of the absorption tank (41).

5. The integrated reactor for carbon dioxide capture and utilization as described in claim 1, characterized in that, The outlet of the crystallization tower (1) is connected to a drying system (5) for drying the slurry inside the crystallization tower (1).

6. The integrated reactor for carbon dioxide capture and utilization as described in claim 5, characterized in that, The crystallization tower (1) is also connected to a lean liquid inlet (12) for receiving the liquid separated by the drying system (5).

7. The integrated carbon dioxide capture and utilization reactor as described in claim 1, characterized in that, A demisting layer (6) is installed at the smoke outlet pipe (22) of the absorption tower (2).

8. The integrated reactor for carbon dioxide capture and utilization as described in claim 1, characterized in that, The crystallization tower (1) is equipped with a stirring mechanism (7) for stirring the slurry, and the stirring mechanism (7) is located below the absorption tower (2).

9. The integrated reactor for carbon dioxide capture and utilization as described in claim 1, characterized in that, The inner wall of the crystallization tower (1) and the inner and outer walls of the absorption tower (2) are all provided with anti-corrosion layers.

10. The integrated carbon dioxide capture and utilization reactor as described in claim 1, characterized in that, The absorption tower (2) is a bubbling tower or a spray tower.

Images