Supercritical carbon dioxide energy storage system with combined cooling heating and power generation

Abstract

The invention belongs to the technical field of carbon dioxide energy storage, and particularly relates to a supercritical carbon dioxide energy storage system with combined cooling, heating and power, which realizes combined cooling, heating and power by recycling waste heat of a combined cooling, heating and power system and improves the energy utilization rate of the system. Carbon dioxide generated by the combined cooling heating and power system is captured and stored in the exhausted oil and gas reservoir high-pressure gas chamber and the exhausted oil and gas reservoir low-pressure gas chamber through the carbon dioxide capturing system, energy is stored through the stored carbon dioxide gas, and the stability maintaining effect on electric energy is achieved while carbon emission is reduced. The energy release unit is in heat exchange connection with the carbon dioxide capture system, the temperature of high-pressure carbon dioxide in the energy release stage is increased, and the comprehensive energy utilization rate and efficiency of the system are further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon dioxide energy storage, and in particular relates to a supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and electricity. Background Art

[0002] With the acceleration of industrialization, the demand for energy supply continues to rise. At present, my country's energy consumption structure is still dominated by fossil energy. Its large-scale use has led to high carbon emissions, exacerbating global warming and ecological environmental pressures. Promoting the low-carbon transformation of the energy system and effectively solving the problem of coordinated development of energy and environment have become important strategic propositions for achieving high-quality economic and social development.

[0003] As the core technology direction for building a new energy system, carbon dioxide energy storage technology is receiving widespread attention. In response to the technical bottlenecks of low system efficiency and low comprehensive energy utilization in the existing system, a supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and electricity is proposed. By optimizing the system's thermodynamic cycle process, the coordinated output and cascade utilization of multiple energy sources such as cooling, heating and electricity are achieved, significantly improving the overall energy conversion efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and electricity to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and electricity, comprising:

[0007] Combined cooling, heating and power systems for cooling, heating and power generation;

[0008] A carbon dioxide capture system, used to capture carbon dioxide generated by the combined cooling, heating and power system;

[0009] A high-pressure gas chamber in a depleted oil and gas reservoir, used for storing high-pressure carbon dioxide, wherein the high-pressure gas chamber in the depleted oil and gas reservoir is connected to the carbon dioxide capture system via an energy replenishment compressor;

[0010] A low-pressure gas chamber in a depleted oil and gas reservoir, used for storing low-pressure carbon dioxide, wherein the low-pressure gas chamber in the depleted oil and gas reservoir is connected to the carbon dioxide capture system;

[0011] An energy release unit, used to release the energy in the carbon dioxide, wherein the air inlet of the energy release unit is connected to the high-pressure air chamber of the depleted oil and gas reservoir, the air outlet of the energy release unit is connected to the low-pressure air chamber of the depleted oil and gas reservoir, and the energy release unit is connected to the carbon dioxide capture system for heat exchange;

[0012] The energy storage unit is used to store energy in carbon dioxide, wherein the air inlet of the energy storage unit is connected to the low-pressure air chamber of the depleted oil and gas reservoir, and the air outlet of the energy storage unit is connected to the high-pressure air chamber of the depleted oil and gas reservoir.

[0013] Preferably, the combined cooling, heating and power system comprises:

[0014] boilers, for heating the air;

[0015] a turbine connected to the boiler;

[0016] A coal-fired power plant generator, drivingly connected to the turbine;

[0017] A first flow divider, the air inlet of which is in communication with the air outlet of the turbine, and an outlet of the first flow divider is connected to a heat user;

[0018] An absorption refrigerator is communicated with another air outlet of the first flow divider, and the absorption refrigerator is connected to a cold user.

[0019] Preferably, the high-pressure gas chamber of the depleted oil and gas reservoir is connected to:

[0020] A high-pressure injection well, used for injecting high-pressure carbon dioxide into the high-pressure gas chamber of the depleted oil and gas reservoir, wherein the high-pressure injection well is connected to the energy replenishment compressor and the energy storage unit;

[0021] The high-pressure recovery well is used to release the high-pressure carbon dioxide in the high-pressure gas chamber of the depleted oil and gas reservoir, and the high-pressure recovery well is connected to the energy release unit.

[0022] Preferably, the low-pressure gas chamber of the depleted oil and gas reservoir is connected to:

[0023] A low-pressure injection well, used for injecting low-pressure carbon dioxide into the low-pressure gas chamber of the depleted oil and gas reservoir, wherein the low-pressure injection well is connected to the carbon dioxide capture system and the energy release unit;

[0024] A low-pressure recovery well is used to release the low-pressure carbon dioxide in the low-pressure gas chamber of the depleted oil and gas reservoir, and the low-pressure recovery well is connected to the energy storage unit.

[0025] Preferably, the energy release unit comprises:

[0026] An expander, whose air inlet is connected to the high-pressure recovery well through a high-pressure throttle valve, and whose air outlet is connected to the low-pressure injection well;

[0027] An electric motor / generator, drivingly connected to the expander;

[0028] The heating component is arranged between the expander and the high-pressure throttle valve, and is used to heat the carbon dioxide gas to be expanded and release energy.

[0029] Preferably, the energy storage unit comprises:

[0030] A compressor is drivingly connected to the motor / generator, an air inlet of the compressor is connected to the low-pressure recovery well, and an air outlet of the compressor is connected to the high-pressure injection well;

[0031] A low-pressure throttle valve is arranged between the compressor and the low-pressure recovery well.

[0032] Preferably, the heating assembly comprises:

[0033] A high-temperature waste heat exchanger, the cold source side inlet of which is connected to the high-pressure throttle valve;

[0034] A solar thermal collector is connected to the cold source side outlet of the high-temperature waste heat exchanger, and the solar thermal collector is connected to the air inlet of the expander.

[0035] Preferably, the carbon dioxide capture system comprises:

[0036] An absorption tower, used for absorbing carbon dioxide, the absorption tower being connected to the flue outlet of the boiler;

[0037] An amine solution storage tank is connected to the top liquid inlet of the absorption tower, and the amine solution storage tank sends the amine lean solution into the absorption tower to absorb carbon dioxide;

[0038] A desorption tower, wherein the top inlet is connected to the bottom liquid outlet of the absorption tower, and the top outlet of the desorption tower is connected to the energy replenishment compressor and the low-pressure injection well through a second splitter;

[0039] A reboiler, connected to the bottom outlet and the bottom inlet of the desorption tower;

[0040] The lean-rich liquid heat exchanger has a cold source side inlet connected to the absorption tower, a cold source side outlet connected to the desorption tower, a heat source side inlet connected to the reboiler, a heat source side outlet connected to the heat source side inlet of the high-temperature waste heat exchanger, and a heat source side outlet of the high-temperature waste heat exchanger connected to the alcoholamine solution storage tank.

[0041] Compared with the prior art, the present invention has the following advantages and technical effects:

[0042] In the present invention, the waste heat of the combined heat, cooling and power system is reused to achieve trigeneration of cooling, heating and power, thereby improving the energy utilization rate of the system; the carbon dioxide generated by the combined heat, cooling and power system is captured by the carbon dioxide capture system and stored in the high-pressure gas chamber of the depleted oil and gas reservoir and the low-pressure gas chamber of the depleted oil and gas reservoir, and energy is stored by the stored carbon dioxide gas, thereby reducing carbon emissions and maintaining the stability of electric energy; the energy release unit is connected to the carbon dioxide capture system by heat exchange, thereby increasing the temperature of the high-pressure carbon dioxide in the energy release stage, and further improving the comprehensive energy utilization rate and system efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0044] Figure 1 is a schematic diagram of the system of the present invention;

[0045] Among them, 1. low-pressure recovery well; 2. low-pressure throttle valve; 3. compressor; 4. high-pressure injection well; 5. high-pressure recovery well; 6. high-pressure throttle valve; 7. solar collector; 8. expander; 9. low-pressure injection well; 10. motor / generator; 11. boiler; 12. turbine; 13. coal-fired power plant generator; 14. first diverter; 15. absorption refrigerator; 16. absorption tower; 17. lean and rich liquid heat exchanger; 18. desorption tower; 19. reboiler; 20. high-temperature waste heat exchanger; 21. amine solution storage tank; 22. second diverter; 23. energy replenishment compressor. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Reference Figure 1 The present invention discloses a supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and electricity, comprising:

[0049] Combined cooling, heating and power systems for cooling, heating and power generation;

[0050] A carbon dioxide capture system to capture carbon dioxide produced by the combined cooling, heating and power system;

[0051] The high-pressure gas chamber of the depleted oil and gas reservoir is used to store high-pressure carbon dioxide. The high-pressure gas chamber of the depleted oil and gas reservoir is connected to the carbon dioxide capture system through the energy replenishment compressor 23;

[0052] A low-pressure gas chamber in a depleted oil and gas reservoir is used to store low-pressure carbon dioxide, and the low-pressure gas chamber in the depleted oil and gas reservoir is connected to a carbon dioxide capture system;

[0053] An energy release unit is used to release the energy in the carbon dioxide. The air inlet of the energy release unit is connected to the high-pressure air chamber of the depleted oil and gas reservoir, the air outlet of the energy release unit is connected to the low-pressure air chamber of the depleted oil and gas reservoir, and the energy release unit is connected to the carbon dioxide capture system for heat exchange;

[0054] The energy storage unit is used to store energy in carbon dioxide. The air inlet of the energy storage unit is connected to the low-pressure air chamber of the depleted oil and gas reservoir, and the air outlet of the energy storage unit is connected to the high-pressure air chamber of the depleted oil and gas reservoir.

[0055] To further optimize the solution, the combined cooling, heating and power system includes:

[0056] A boiler 11 for heating air;

[0057] A turbine 12, connected to the boiler 11;

[0058] A coal-fired power plant generator 13 is drivingly connected to the turbine 12;

[0059] A first flow divider 14, the air inlet of which is communicated with the air outlet of the turbine 12, and an outlet of the first flow divider 14 is connected to a heat user;

[0060] The absorption refrigerator 15 is communicated with another air outlet of the first splitter 14, and the absorption refrigerator 15 is connected to a cold user.

[0061] To further optimize the scheme, the high pressure gas chamber of the depleted oil and gas reservoir is connected with:

[0062] A high-pressure injection well 4, used to inject high-pressure carbon dioxide into the high-pressure gas chamber of the depleted oil and gas reservoir, and the high-pressure injection well 4 is connected to the energy replenishment compressor 23 and the energy storage unit;

[0063] The high-pressure recovery well 5 is used to release the high-pressure carbon dioxide in the high-pressure gas chamber of the depleted oil and gas reservoir. The high-pressure recovery well 5 is connected to the energy release unit.

[0064] To further optimize the scheme, the low-pressure gas chambers of the depleted oil and gas reservoirs are connected to:

[0065] A low-pressure injection well 9, used to inject low-pressure carbon dioxide into the low-pressure gas chamber of the depleted oil and gas reservoir, and the low-pressure injection well 9 is connected to the carbon dioxide capture system and the energy release unit;

[0066] The low-pressure recovery well 1 is used to release the low-pressure carbon dioxide in the low-pressure gas chamber of the depleted oil and gas reservoir. The low-pressure recovery well 1 is connected to the energy storage unit.

[0067] To further optimize the solution, the energy release unit includes:

[0068] The expander 8 has an air inlet connected to the high-pressure recovery well 5 through a high-pressure throttle valve 6, and an air outlet connected to a low-pressure injection well 9;

[0069] The motor / generator 10 is transmission-connected to the expander 8;

[0070] The heating component is arranged between the expander 8 and the high-pressure throttle valve 6, and is used to heat the carbon dioxide gas to be expanded and release energy.

[0071] To further optimize the solution, the energy storage unit includes:

[0072] The compressor 3 is connected to the motor / generator 10 by transmission, the air inlet of the compressor 3 is connected to the low-pressure recovery well 1, and the air outlet of the compressor 3 is connected to the high-pressure injection well 4;

[0073] The low-pressure throttle valve 2 is arranged between the compressor 3 and the low-pressure recovery well 1 .

[0074] To further optimize the solution, the heating components include:

[0075] The high-temperature waste heat exchanger 20, the cold source side inlet is connected to the high-pressure throttle valve 6;

[0076] The solar thermal collector 7 is communicated with the cold source side outlet of the high-temperature waste heat exchanger 20 , and the solar thermal collector 7 is communicated with the air inlet of the expander 8 .

[0077] Further optimizing the scheme, the CO2 capture system includes:

[0078] An absorption tower 16, used for absorbing carbon dioxide, the absorption tower 16 is connected to the flue outlet of the boiler 11;

[0079] The alcoholamine solution storage tank 21 is connected to the top liquid inlet of the absorption tower 16, and the alcoholamine solution storage tank 21 sends the alcoholamine lean liquid into the absorption tower 16 to absorb carbon dioxide;

[0080] The top inlet of the desorption tower 18 is connected to the bottom liquid outlet of the absorption tower 16, and the top outlet of the desorption tower 18 is connected to the energy replenishment compressor 23 and the low-pressure injection well 9 through the second splitter 22;

[0081] The reboiler 19 is connected to the bottom outlet and the bottom inlet of the desorption tower 18;

[0082] The lean-rich liquid heat exchanger 17 has a cold source side inlet connected to the absorption tower 16, a cold source side outlet connected to the desorption tower 18, a heat source side inlet connected to the reboiler 19, a heat source side outlet connected to the heat source side inlet of the high-temperature waste heat exchanger 20, and a heat source side outlet of the high-temperature waste heat exchanger 20 connected to the alcoholamine solution storage tank 21.

[0083] Working principle:

[0084] Combined cooling, heating and power generation:

[0085] After being heated by the boiler 11, the air enters the turbine 12. The turbine 12 performs work and drives the coal-fired power plant generator 13 to generate electricity, thereby realizing the output of electric energy. After the work, the air is divided by the first splitter 14, a part of which is used to heat the heat users, and the other part is cooled by the absorption refrigerator 15 and the cold energy is supplied to the cold users, thereby realizing the trigeneration of heat, cold and electricity, and realizing the efficient use of heat energy.

[0086] Carbon dioxide capture:

[0087] The carbon dioxide gas generated by the combustion of the boiler 11 enters the absorption tower 16 from the bottom of the absorption tower 16, and the lean liquid (the alcohol amine solution that has not absorbed carbon dioxide is called lean liquid) in the alcohol amine solution storage tank 21 enters the absorption tower 16 from the top of the absorption tower 16 to absorb carbon dioxide, and the flue gas with carbon dioxide removed is discharged through the top of the absorption tower 16, and the rich liquid (the alcohol amine solution that has absorbed carbon dioxide is called rich liquid) is sent to the desorption tower 18 for desorption and regeneration after heat exchange treatment in the lean-rich liquid heat exchanger 17 (the operating temperature of the absorption tower 16 is lower than that of the desorption tower 18, so it needs to be heated by the lean-rich liquid heat exchanger 17). In the desorption process, the rich liquid is decomposed by steam heating in the desorption tower 18, and alcohol amine and carbon dioxide are regenerated. At this time, part of the alcohol amine solution that has not absorbed carbon dioxide is discharged through the bottom of the desorption tower 18, enters the reboiler 19 for heating again to completely desorb carbon dioxide, and the desorbed carbon dioxide enters the desorption tower 18 and is discharged from the top of the tower. After being diverted by the second diverter 22, part of it is compressed by the energy replenishment compressor 23 and enters the high-pressure gas chamber of the depleted oil and gas reservoir through the high-pressure injection well 4 or is directly injected into the low-pressure gas chamber of the depleted oil and gas reservoir through the low-pressure injection well 9; the desorbed alcohol amine solution is passed through the lean-rich liquid heat exchanger 17 and the high-temperature waste heat exchanger 20 again to cool to the same temperature as the flue gas, and then stored in the alcohol amine solution storage tank 21 for recovery, and reused when the capture system is operated next time;

[0088] Energy storage: During the low electricity consumption period, the supercritical carbon dioxide in the low-pressure gas chamber of the depleted oil and gas reservoir is released through the low-pressure recovery well 1, and the pressure is maintained stable through the low-pressure throttle valve 2. After that, the carbon dioxide enters the compressor 3 and is compressed to a high-temperature and high-pressure state and injected into the high-pressure gas chamber of the depleted oil and gas reservoir through the high-pressure injection well 4 for storage. This is the energy storage process of the supercritical carbon dioxide energy storage system. While the energy storage process is in progress, the carbon dioxide captured in the carbon dioxide capture system is directly injected into the depleted oil and gas reservoir from the low-pressure injection well 9 or after being compressed by the energy-boosting compressor 23 to ensure that the pressure of the depleted oil and gas reservoir is constant, maintain system stability, and improve system performance.

[0089] Energy release: During peak electricity consumption, high-temperature and high-pressure carbon dioxide is released from the high-pressure recovery well 5. After the pressure is stabilized by the high-pressure throttle valve 6, the high-temperature waste heat generated by the carbon dioxide capture system is used by the high-temperature waste heat exchanger 20, and the temperature of the carbon dioxide is further increased by the solar collector 7. After that, the high-temperature and high-pressure carbon dioxide enters the expander 8 to do work and drives the motor / generator 10 to generate electricity. The carbon dioxide after doing work is injected into the depleted oil and gas reservoir through the low-pressure injection well 9 to complete the energy release process.

[0090] The present invention utilizes depleted oil and gas reservoirs as gas storage reservoirs to store carbon dioxide, thereby solving the problem of excessively high gas storage costs. At the same time, geothermal energy can be used to heat carbon dioxide, thereby improving comprehensive energy utilization.

[0091] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0092] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and electricity, characterized in that: include: Combined cooling, heating and power systems for cooling, heating and power generation; A carbon dioxide capture system, used to capture carbon dioxide generated by the combined cooling, heating and power system; A high-pressure gas chamber of a depleted oil and gas reservoir, used for storing high-pressure carbon dioxide, wherein the high-pressure gas chamber of the depleted oil and gas reservoir is connected to the carbon dioxide capture system via an energy replenishment compressor (23); A low-pressure gas chamber in a depleted oil and gas reservoir, used for storing low-pressure carbon dioxide, wherein the low-pressure gas chamber in the depleted oil and gas reservoir is connected to the carbon dioxide capture system; An energy release unit, used to release the energy in the carbon dioxide, wherein the air inlet of the energy release unit is connected to the high-pressure air chamber of the depleted oil and gas reservoir, the air outlet of the energy release unit is connected to the low-pressure air chamber of the depleted oil and gas reservoir, and the energy release unit is connected to the carbon dioxide capture system for heat exchange; The energy storage unit is used to store energy in carbon dioxide, wherein the air inlet of the energy storage unit is connected to the low-pressure air chamber of the depleted oil and gas reservoir, and the air outlet of the energy storage unit is connected to the high-pressure air chamber of the depleted oil and gas reservoir.

2. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and power according to claim 1, characterized in that: The combined cooling, heating and power system comprises: A boiler (11) for heating air; a turbine (12) connected to the boiler (11); A coal-fired power plant generator (13), drivingly connected to the turbine (12); A first flow divider (14), the air inlet of which is in communication with the air outlet of the turbine (12), and an outlet of the first flow divider (14) is connected to a heat user; An absorption refrigeration machine (15) is communicated with another air outlet of the first flow divider (14), and the absorption refrigeration machine (15) is connected to a cold user.

3. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and power according to claim 2, characterized in that: The high pressure gas chamber of the depleted oil and gas reservoir is connected with: A high-pressure injection well (4), used for injecting high-pressure carbon dioxide into the high-pressure gas chamber of the depleted oil and gas reservoir, wherein the high-pressure injection well (4) is connected to the energy replenishment compressor (23) and the energy storage unit; The high-pressure recovery well (5) is used to release the high-pressure carbon dioxide in the high-pressure gas chamber of the depleted oil and gas reservoir, and the high-pressure recovery well (5) is connected to the energy release unit.

4. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and power according to claim 3, characterized in that: The low-pressure gas chamber of the depleted oil and gas reservoir is connected with: A low-pressure injection well (9), used for injecting low-pressure carbon dioxide into the low-pressure gas chamber of the depleted oil and gas reservoir, wherein the low-pressure injection well (9) is connected to the carbon dioxide capture system and the energy release unit; A low-pressure recovery well (1) is used to release the low-pressure carbon dioxide in the low-pressure gas chamber of the depleted oil and gas reservoir, and the low-pressure recovery well (1) is connected to the energy storage unit.

5. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and power according to claim 4, characterized in that: The energy release unit comprises: An expander (8), the air inlet of which is connected to the high-pressure recovery well (5) through a high-pressure throttle valve (6), and the air outlet of which is connected to the low-pressure injection well (9); An electric motor / generator (10) is drivingly connected to the expander (8); A heating component is arranged between the expander (8) and the high-pressure throttle valve (6) and is used to heat the carbon dioxide gas to be expanded and release energy.

6. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and power according to claim 5, characterized in that: The energy storage unit comprises: A compressor (3) is drivingly connected to the motor / generator (10), an air inlet of the compressor (3) is connected to the low-pressure recovery well (1), and an air outlet of the compressor (3) is connected to the high-pressure injection well (4); A low-pressure throttle valve (2) is arranged between the compressor (3) and the low-pressure recovery well (1).

7. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and power according to claim 5, characterized in that: The heating assembly comprises: A high-temperature waste heat exchanger (20), the cold source side inlet of which is connected to the high-pressure throttle valve (6); The solar thermal collector (7) is connected to the cold source side outlet of the high-temperature waste heat exchanger (20), and the solar thermal collector (7) is connected to the air inlet of the expander (8).

8. A supercritical carbon dioxide energy storage system with trigeneration of cooling, heating and power according to claim 7, characterized in that: The carbon dioxide capture system comprises: An absorption tower (16) for absorbing carbon dioxide, wherein the absorption tower (16) is connected to a flue outlet of the boiler (11); An amine solution storage tank (21) is connected to the top liquid inlet of the absorption tower (16), and the amine solution storage tank (21) sends the amine lean liquid into the absorption tower (16) to absorb carbon dioxide; A desorption tower (18), the top inlet of which is connected to the bottom liquid outlet of the absorption tower (16), and the top outlet of the desorption tower (18) is connected to the energy replenishment compressor (23) and the low-pressure injection well (9) through a second splitter (22); a reboiler (19) connected to the bottom outlet and the bottom inlet of the desorption tower (18); The lean-rich liquid heat exchanger (17) has a cold source side inlet connected to the absorption tower (16), a cold source side outlet connected to the desorption tower (18), a heat source side inlet connected to the reboiler (19), a heat source side outlet connected to the heat source side inlet of the high-temperature waste heat exchanger (20), and a heat source side outlet of the high-temperature waste heat exchanger (20) connected to the alcoholamine solution storage tank (21).

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