CO2 rich amine regeneration system

Abstract

The utility model provides a CO2 rich amine regeneration system, which comprises a regeneration tower, an upper heat exchanger and a lower heat exchanger are arranged in the regeneration tower, the upper heat exchanger and the lower heat exchanger are respectively connected with a steam pipe to input steam, and the heat exchange area is increased and the heat exchange efficiency is accelerated by combining the upper heat exchanger and the lower heat exchanger so as to perform solution regeneration. According to the CO2 rich amine regeneration system provided by the utility model, through the matching of the upper heat exchanger, the lower heat exchanger and the steam pipe, when the temperature of the steam at the front end is lower, the steam can be fully utilized to carry out large-area heating, and solution regeneration is carried out by adopting a mode of enlarging the heat exchange area and accelerating the heat exchange efficiency. According to the mode, under the condition that the CO2 yield and the gas-liquid ratio are kept unchanged, the influence of the steam temperature on the regeneration process can be greatly reduced, and meanwhile the equipment investment cost is correspondingly reduced along with the reduction of the requirement for the steam temperature.

Description

Technical Field

[0001] This invention belongs to the field of amine-based CO2 capture technology, specifically relating to a CO2 amine-rich regeneration system. Background Technology

[0002] Currently, amine carbon capture is the most widely used carbon recovery technology in industrial applications within CCUS technology. Common regeneration tower structures include... Figure 1 As shown, in order to achieve the regeneration process of CO2-rich amine and realize the cycle of CO2 absorption-desorption, the CO2-rich amine is heated by using steam introduced into the heat exchanger at the bottom of the traditional regeneration tower, based on the high-temperature regeneration characteristics of CO2-rich amine. This process requires a large amount of steam, resulting in the energy consumption of the regeneration process accounting for more than 70% of the total energy consumption of amine-based carbon capture. Summary of the Invention

[0003] In view of the above technical problems, in order to improve the steam utilization efficiency of the regeneration process, this utility model provides a CO2 amine-rich regeneration system to reduce steam consumption under the same CO2 amine-rich quantity and CO2 production capacity.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A CO2-rich amine regeneration system includes a regeneration tower, which contains an upper heat exchanger and a lower heat exchanger, both connected to steam pipes for steam input. The combination of upper and lower heat exchangers increases the heat exchange area and accelerates heat exchange efficiency for solution regeneration.

[0006] Furthermore, the outer diameter of the lower heat exchanger is larger than the outer diameter of the upper heat exchanger.

[0007] Furthermore, the branch pipes of the steam pipe are respectively connected to the upper heat exchanger and the lower heat exchanger.

[0008] Furthermore, the upper heat exchanger and the lower heat exchanger are respectively connected to water outlet pipes near their bottom ends.

[0009] Furthermore, the bottom of the regeneration tower is connected to a CO2 lean amine liquid output pipe.

[0010] Furthermore, the upper part of the regeneration tower is connected to a CO2-rich amine liquid input pipe.

[0011] Furthermore, a CO2 exhaust pipe is connected to the top of the regeneration tower.

[0012] The beneficial effects of this utility model are:

[0013] Compared to existing technologies, the CO2-rich amine regeneration system provided by this invention, through the coordinated use of upper and lower heat exchangers and steam pipes, initially raises the temperature of the CO2-rich amine solution in the upper heat exchanger when the temperature of the front-end steam (entering the stripping tower) is relatively low. Subsequently, it undergoes further deep heating in the larger lower heat exchanger. This fully utilizes the steam for large-area heating and employs a method that increases the heat exchange area and accelerates the heat exchange efficiency for solution regeneration. This method, while maintaining a constant CO2 output and gas-liquid ratio, can significantly reduce the impact of steam temperature on the regeneration process. Furthermore, as the steam temperature requirement decreases, the equipment investment cost is correspondingly reduced. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a common CO2-rich amine regeneration system.

[0015] Figure 2 This is a schematic diagram of the CO2-rich amine regeneration system of this utility model;

[0016] The components are: 1. Regeneration tower, 2. Upper heat exchanger, 3. Lower heat exchanger, 4. Steam pipe, 5. CO2 lean amine liquid output pipe, 6. CO2 rich amine liquid input pipe, 7. Water outlet pipe, and 8. CO2 exhaust pipe. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model. Example 1

[0018] like Figure 2 As shown, a CO2-rich amine regeneration system includes a regeneration tower 1 and a steam pipe 4. The regeneration tower 1 is equipped with a heat exchanger 2 and a lower heat exchanger 3. Branch pipes from the steam pipe 4 are connected to the upper heat exchanger 2 and the lower heat exchanger 3 respectively. The combination of upper and lower heat exchangers increases the heat exchange area and accelerates the heat exchange efficiency for solution regeneration. The outer diameter of the lower heat exchanger 3 is larger than that of the upper heat exchanger 2. Water outlet pipes 7 are connected to the lower heat exchanger 2 and the lower heat exchanger 3 near their bottoms. A CO2 lean amine solution output pipe 5 is connected to the bottom of the regeneration tower 1, a CO2-rich amine solution input pipe 6 is connected to the upper part of the regeneration tower, and a CO2 exhaust pipe 8 is connected to the top of the regeneration tower.

[0019] The CO2-rich amine regeneration system provided by this invention, through the coordination of regeneration tower 1, upper and lower heat exchangers, and steam pipe 4, addresses the issue of insufficient steam supply, which cannot provide the designed heat required by the system. A portion of steam can be introduced into the upper heat exchanger 2, employing a dual-heat exchanger combination for solution regeneration. This method can save a significant amount of steam consumption while maintaining the same CO2-rich amine quantity and production capacity. Furthermore, as the required steam temperature decreases, the equipment investment cost is correspondingly reduced.

[0020] Any combination of different embodiments of this utility model, provided it does not violate the inventive concept of this utility model, shall be considered as the disclosure of this utility model; any simple modifications to the technical solution and any combination of different embodiments within the scope of the inventive concept of this utility model, without violating the inventive concept of this utility model, shall be within the protection scope of this utility model.

Claims

1. A CO2-rich amine regeneration system, characterized in that: It includes a regeneration tower (1), which is equipped with an upper heat exchanger (2) and a lower heat exchanger (3). The upper heat exchanger (2) and the lower heat exchanger (3) are respectively connected to a steam pipe (4) to input steam.

2. The CO2-rich amine regeneration system according to claim 1, characterized in that: The outer diameter of the upper heat exchanger (2) is larger than the outer diameter of the lower heat exchanger (3).

3. The CO2-rich amine regeneration system according to claim 1 or 2, characterized in that: The steam pipe (4) branches off and connects to the upper heat exchanger (2) and the lower heat exchanger (3) respectively.

4. The CO2-rich amine regeneration system according to claim 1 or 2, characterized in that: The upper heat exchanger (2) and the lower heat exchanger (3) are respectively connected to water outlet pipes (7) near the bottom.

5. The CO2-rich amine regeneration system according to claim 1 or 2, characterized in that: The bottom of the regeneration tower (1) is connected to a CO2 lean amine liquid output pipe (5).

6. The CO2-rich amine regeneration system according to claim 1 or 2, characterized in that: The upper part of the regeneration tower (1) is connected to a CO2-rich amine liquid input pipe (6).

7. The CO2-rich amine regeneration system according to claim 1 or 2, characterized in that: The top of the regeneration tower (1) is connected to a CO2 exhaust pipe (8).

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