A small skid-mounted carbon dioxide capture device

Abstract

The utility model discloses a kind of small pry-mounted carbon dioxide capture devices, it relates to carbon dioxide capture technical field, the small pry-mounted carbon dioxide capture device, including pry-mounted base of steel, coaxial nested reaction tower is vertically fixed on pry-mounted base, coaxial nested reaction tower includes outer tube and inner tube coaxially arranged in its inside, outer tube and inner tube share same central axis, outer tube and inner tube bottom are communicated by annular groove and flow guide pipe, outer tube is used for carbon dioxide absorption reaction in flue gas, inner tube is used for heating regeneration of rich amine liquid, annular chamber formed between inner tube and outer tube is equipped with filler layer. The utility model is integrated with pry by coaxial nested reaction tower, and absorption, regeneration, heat exchange, control and other functional modules are highly compact layout, equipment volume is reduced, miniaturization, modularization and portable carbon dioxide capture are realized, and it is suitable for fast deployment and efficient emission reduction of distributed emission source with limited site.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide capture technology, and in particular to a small skid-mounted carbon dioxide capture device. Background Technology

[0002] With the advancement of the "dual carbon" strategy, carbon dioxide capture technology is being applied more and more widely in the industrial field. Traditional amine-based decarbonization devices are mostly large tower systems, usually with absorption towers and regeneration towers arranged separately. The supporting equipment is scattered, occupying a large area, with complex piping, and long installation cycles. They are difficult to meet the needs of small industrial boilers, gas turbines, data centers and other distributed emission sources for the miniaturization, integration and rapid deployment of carbon capture equipment.

[0003] Although skid-mounted carbon capture devices have emerged in recent years, most still suffer from problems such as loose structural layout, low space utilization, high energy consumption, and long pipelines. In particular, it is difficult to achieve efficient integration of absorption and regeneration functions in a limited space. Utility Model Content

[0004] This utility model provides a small skid-mounted carbon dioxide capture device, including a steel skid base. A coaxial nested reaction tower is vertically fixed on the skid base. The coaxial nested reaction tower includes an outer cylinder and an inner cylinder coaxially disposed inside it. The outer cylinder and the inner cylinder share the same central axis. The bottom of the outer cylinder and the inner cylinder are connected by an annular groove and a guide pipe. The outer cylinder is used for the absorption reaction of carbon dioxide in flue gas, and the inner cylinder is used for the heating and regeneration of amine-rich liquid. A packing layer is provided in the annular cavity formed between the inner cylinder and the outer cylinder.

[0005] Preferably, a spray element is installed on the inner side of the top of the outer cylinder. The spray element is connected to the outlet end of the lean amine liquid circulation pump through a short-distance pipe. The lean amine liquid circulation pump is fixedly installed on the skid base and close to the side wall of the outer cylinder. The outlet of the lean amine liquid circulation pump faces the spray element. An exhaust pipe is provided at the top of the outer cylinder.

[0006] Preferably, the bottom of the inner cylinder is provided with a lean amine liquid outlet, which is directly connected to the inlet end of the lean amine liquid circulation pump through an L-shaped connecting pipe.

[0007] Preferably, the inner cylinder is equipped with a steam coil, which is spirally arranged below the surface of the amine liquid. Its steam inlet and outlet are respectively sealed and led out through the inner cylinder and the outer cylinder to connect to an external steam source and a condensate recovery system, thereby indirectly heating the amine liquid to promote the release of carbon dioxide.

[0008] Preferably, a microchannel heat exchanger is wound around the lower part of the outer wall of the outer cylinder. The microchannel heat exchanger has a dual-channel structure. The inlet of the first channel is connected to the rich amine liquid outlet at the bottom of the outer cylinder through a pipe. The outlet of the first channel is connected to the regeneration section inlet of the inner cylinder through a pipe. A pump body is connected to the pipe. The inlet of the second channel is connected to the lean amine liquid outlet at the bottom of the inner cylinder through a pipe. The outlet of the second channel flows into the inlet of the lean amine liquid circulation pump through a pipe.

[0009] Preferably, the top of the inner cylinder is connected to the inlet of the condenser through an exhaust pipe. The condenser is fixedly installed on the skid base. The gas outlet of the condenser is used to discharge high-purity carbon dioxide after dehydration. A condensate discharge port is provided at the bottom. A control box is provided on the side of the skid base.

[0010] This utility model provides a small skid-mounted carbon dioxide capture device, which, compared with the prior art, has the following advantages: This invention integrates the outer and inner cylinders coaxially on a steel skid-mounted base, making full use of vertical space to achieve an integrated layout for absorption and regeneration functions, reducing the horizontal footprint of the equipment. Combined with designs such as a microchannel heat exchanger wound around the outer wall of the outer cylinder, a control box embedded in the side of the base, and a circulating pump installed close to the tower, space utilization is improved. The entire process is integrated within a limited skid-mounted enclosure. Furthermore, the flow path is optimized through L-shaped connecting pipes laid close to the wall and short-distance pipeline transportation, reducing pipeline extension and pressure loss. The entire system has a compact structure and highly integrated components, enabling factory prefabrication, overall transportation, and rapid installation. It fully meets the core requirements of miniaturized, modular, and mobile carbon dioxide capture devices for space compactness and deployment flexibility, making it particularly suitable for efficient on-site emission reduction of distributed emission sources with limited space. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a side view of the overall structure of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the coaxial nested reaction tower structure according to an embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of the outer cylinder structure according to an embodiment of the present utility model; Figure 5This is a side view of the internal structure of the outer cylinder according to an embodiment of the present utility model; Figure 6 This is a cross-sectional schematic diagram of the inner cylinder structure according to an embodiment of the present utility model.

[0013] Figure label: 1. Skid-mounted base; 2. Control box; 3. Outer cylinder; 4. Inner cylinder; 5. Annular groove; 6. Guide pipe; 7. Steam coil; 8. Packing layer; 9. Spraying components; 10. Exhaust pipe one; 11. Exhaust pipe two; 12. Lean amine liquid circulation pump; 13. Microchannel heat exchanger; 14. Pump body; 15. Condenser. Detailed Implementation

[0014] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0015] Please refer to Figures 1-6 This utility model provides a small skid-mounted carbon dioxide capture device, including a steel skid base 1. The skid base 1 serves as the support platform for the entire device and is welded from high-strength carbon steel, which has good load-bearing capacity and structural stability. A set of coaxial nested reaction towers are vertically fixed on it. The coaxial nested reaction towers include an outer cylinder 3 and an inner cylinder 4 coaxially arranged inside it. The two share the same central axis, forming a concentric cylindrical structure with inner and outer nesting.

[0016] The bottom of the outer cylinder 3 and the inner cylinder 4 are connected by an annular groove 5 and a guide pipe 6 to ensure that the rich amine liquid accumulated at the bottom of the outer cylinder 3 can flow smoothly into the inner cylinder 4 for regeneration treatment. At the same time, the annular groove 5 can act as a liquid seal to prevent the gas in the regeneration section from flowing back into the absorption section.

[0017] The annular chamber between the outer cylinder 3 and the inner cylinder 4 forms the flue gas absorption zone. The interior is equipped with a regular packing layer 8 to increase the gas-liquid contact area and improve CO2 absorption efficiency. The CO2-containing flue gas enters from the bottom of the outer cylinder 3, flows upward, and comes into countercurrent contact with the lean amine liquid sprayed from top to bottom to complete the carbon dioxide absorption reaction.

[0018] A spray element 9 is installed on the inner side of the top of the outer cylinder 3. The spray element 9 is a porous distribution plate that can evenly distribute the liquid. The spray element 9 is connected to the outlet end of the lean amine liquid circulation pump 12 through a short-distance pipe to achieve efficient transportation of lean amine liquid. The lean amine liquid circulation pump 12 is fixedly installed on the skid-mounted base 1 and arranged close to the side wall of the outer cylinder 3. Its liquid outlet faces the spray element 9 directly, shortening the transportation distance and reducing pipeline pressure loss and energy consumption. The top of the outer cylinder 3 is also equipped with an exhaust pipe 2 11, which is used to discharge the purified flue gas after CO2 removal from the system.

[0019] refer to Figure 6The inner cylinder 4 is used for heating and regenerating the rich amine liquid. A steam coil 7 is installed in the lower part of the inner cylinder 4. The steam coil 7 is arranged in a spiral shape and is completely submerged below the surface of the rich amine liquid to ensure efficient heat transfer. The steam inlet and outlet of the steam coil 7 pass through the side wall of the inner cylinder 4 and the outer cylinder 3, respectively, and are led out through a sealing structure to connect to an external steam source and a condensate recovery system, thereby achieving indirect heating of the rich amine liquid and promoting its decomposition to release high-purity CO2 gas.

[0020] The regenerated high-temperature lean amine liquid flows out from the lean amine liquid outlet at the bottom of the inner cylinder 4. This outlet is directly connected to the inlet end of the lean amine liquid circulation pump 12 through an L-shaped connecting pipe. The L-shaped connecting pipe is arranged along the inner wall of the skid-mounted base 1 to avoid occupying the central operating space and form a compact vertical confluence structure.

[0021] To further improve energy efficiency, a microchannel heat exchanger 13 is wound around the lower part of the outer wall of the outer cylinder 3. The microchannel heat exchanger 13 has a dual-channel structure and is made of corrosion-resistant metal material. The inlet of the first channel is connected to the rich amine liquid outlet at the bottom of the outer cylinder 3 through a pipe, and the outlet is connected to the regeneration section inlet of the inner cylinder 4. A pump body 14 is installed on the pipe to drive the rich amine liquid into the regeneration system. The inlet of the second channel is connected to the lean amine liquid outlet at the bottom of the inner cylinder 4, and the outlet is connected to the inlet of the lean amine liquid circulation pump 12 through a pipe. Through this design, the high-temperature lean amine liquid transfers its residual heat to the low-temperature rich amine liquid to be regenerated before entering the lean amine liquid circulation pump 12, thereby realizing energy recovery and reducing regeneration energy consumption.

[0022] The inner cylinder 4 is equipped with an exhaust pipe 10 at the top, which is used to discharge the CO2 gas released during the regeneration process. The exhaust pipe 10 is connected to the inlet of the condenser 15. The condenser 15 is fixedly installed on the skid base 1 and located above the side of the reaction tower. The structure is compact.

[0023] The condenser 15 is used to cool high-temperature CO2 gas and remove entrained water vapor and trace amounts of amine mist. Its gas outlet can be connected to a subsequent compression or storage system. A condensate discharge port is provided at the bottom for recovering condensate and returning it to the system for reuse.

[0024] In addition, a control box 2 is provided on the side of the skid-mounted base 1. The control box 2 integrates a PLC controller, sensor signal module, pump and valve drive unit, etc. It is electrically connected to various temperature, pressure, flow sensors and actuators through pre-set wire grooves to realize automatic monitoring and safety interlock of the entire system and ensure stable operation of the device.

[0025] In summary, the carbon dioxide-containing flue gas enters from the bottom of the outer cylinder 3 and comes into countercurrent contact with the lean amine liquid sprayed from the spray element 9 in the annular absorption zone. After the CO2 is absorbed, it forms a rich amine liquid and accumulates at the bottom of the outer cylinder 3. This rich amine liquid flows into the bottom of the inner cylinder 4 through the annular groove 5 and the guide pipe 6. Driven by the pump body 14, it enters the first channel of the microchannel heat exchanger 13. After being preheated by the high-temperature lean amine liquid from the regeneration section, it is sent into the inner cylinder 4 for regeneration. Under the heating action of the steam coil 7, the rich amine liquid decomposes and releases CO2 gas, which enters through the exhaust pipe 10. After dehydration, the condenser 15 collects and utilizes the regenerated high-temperature lean amine liquid. The regenerated high-temperature lean amine liquid flows out from the bottom of the inner cylinder 4 and enters the second channel of the microchannel heat exchanger 13. The heat is transferred to the rich amine liquid and then cooled. The liquid is then connected to the inlet of the lean amine liquid circulation pump 12 through the L-shaped connecting pipe. The lean amine liquid circulation pump 12 pressurizes the lean amine liquid and then transports it to the spray element 9 through the short-distance pipeline for re-spraying, completing the closed-loop circulation. The entire system is highly integrated on the skid-mounted base 1 and is fully automated by the control box 2. The entire process of carbon dioxide capture and amine liquid regeneration is efficiently completed in a compact space.

[0026] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A small skid-mounted carbon dioxide capture device, characterized in that: The system includes a steel skid-mounted base (1), on which a coaxial nested reaction tower is vertically fixed. The coaxial nested reaction tower includes an outer cylinder (3) and an inner cylinder (4) coaxially disposed inside it. The outer cylinder (3) and the inner cylinder (4) share the same central axis. The bottom of the outer cylinder (3) and the inner cylinder (4) are connected by an annular groove (5) and a guide pipe (6). The outer cylinder (3) is used for the absorption reaction of carbon dioxide in flue gas, and the inner cylinder (4) is used for the heating and regeneration of amine-rich liquid. A packing layer (8) is provided in the annular cavity formed between the inner cylinder (4) and the outer cylinder (3).

2. The small skid-mounted carbon dioxide capture device according to claim 1, characterized in that: A spray element (9) is installed on the inner side of the top of the outer cylinder (3). The spray element (9) is connected to the outlet end of the lean amine liquid circulation pump (12) through a short-distance pipe. The lean amine liquid circulation pump (12) is fixedly installed on the skid base (1) and close to the side wall of the outer cylinder (3). The outlet of the lean amine liquid circulation pump (12) faces the spray element (9). The top of the outer cylinder (3) is provided with an exhaust pipe (11).

3. The small skid-mounted carbon dioxide capture device according to claim 2, characterized in that: The bottom of the inner cylinder (4) is provided with a lean amine liquid outlet, which is directly connected to the inlet end of the lean amine liquid circulation pump (12) through an L-shaped connecting pipe.

4. The small skid-mounted carbon dioxide capture device according to claim 3, characterized in that: The inner cylinder (4) is equipped with a steam coil (7), which is spirally arranged below the surface of the amine liquid. Its steam inlet and steam outlet are respectively sealed and led out through the inner cylinder (4) and the outer cylinder (3) to connect to the external steam source and the condensate recovery system, so as to indirectly heat the amine liquid to promote the release of carbon dioxide.

5. The small skid-mounted carbon dioxide capture device according to claim 4, characterized in that: The outer cylinder (3) has a microchannel heat exchanger (13) wrapped around its lower outer wall. The microchannel heat exchanger (13) has a dual-channel structure. The inlet of the first channel is connected to the rich amine liquid outlet at the bottom of the outer cylinder (3) through a pipe. The outlet of the first channel is connected to the regeneration section inlet of the inner cylinder (4) through a pipe. A pump body (14) is connected to the pipe. The inlet of the second channel is connected to the lean amine liquid outlet at the bottom of the inner cylinder (4) through a pipe. The outlet of the second channel flows into the inlet of the lean amine liquid circulation pump (12) through a pipe.

6. The small skid-mounted carbon dioxide capture device according to claim 5, characterized in that: The top of the inner cylinder (4) is connected to the inlet of the condenser (15) through an exhaust pipe (10). The condenser (15) is fixedly installed on the skid base (1). The gas outlet of the condenser (15) is used to discharge high-purity carbon dioxide after dehydration. The bottom is provided with a condensate discharge port. The side of the skid base (1) is provided with a control box (2).

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