Power generation system coupled with electrolysis flue gas waste heat, compressed air waste heat and air energy storage

Abstract

The application discloses a power generation system coupled with electrolysis flue gas waste heat, compressed air waste heat and air energy storage, belongs to the technical field of waste heat utilization, and comprises a compressed air waste heat energy unit, an air energy storage power generation unit and an electrolysis flue gas waste heat power generation unit.In the compressed air waste heat energy unit, air is supplied to users in one route and stored after being twice boosted and twice cooled in another route; the air energy storage power generation unit releases the stored air, supplies the air to users after heating, power generation and pressure reduction; the compressed air waste heat energy unit exchanges heat with the electrolysis flue gas waste heat power generation unit through cooling water; the air energy storage power generation unit absorbs the heat of organic matter in the electrolysis flue gas waste heat power generation unit; the electrolysis flue gas waste heat power generation unit heats the organic matter by utilizing electrolysis flue gas waste heat; and the organic matter steam generates power.The application can improve the utilization efficiency of electrolysis flue gas waste heat, realize cascade utilization of waste heat, realize deep peak shaving of a compressed air system of an electrolytic aluminum plant, and reduce venting.

Description

Technical Field

[0001] This invention belongs to the field of waste heat utilization technology, and particularly relates to a power generation system that couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage. Background Technology

[0002] Electrolytic aluminum plants are major consumers of compressed air. For example, a 500,000-ton capacity electrolytic aluminum plant consumes 1200 Nm³ of compressed air. 3 The compressed air compressor, operating at a speed of [speed / min], is mainly used in electrolytic cell shelling and feeding, electrolytic flue gas desulfurization, and dust collection. The compressed air consumption is characterized by large load fluctuations, typically low at night and high during the day, with compressed air venting occurring at night. The heat generated during the compressor's compression process is carried to the cooling tower by cooling water and dissipated into the atmosphere; both of these situations result in significant energy waste.

[0003] Aluminum electrolysis flue gas is mainly composed of carbon dioxide, with fluorides, sulfur dioxide, and dust as the main pollutants. The outlet flue gas temperature of the electrolytic cell is generally 110~140℃, and a large amount of heat energy is lost into the air with the emission of electrolysis flue gas. Currently, the main method of utilizing the waste heat of electrolysis flue gas is to install heat exchangers to recover the heat for heating and bathing, but the heat is not being fully utilized. Summary of the Invention

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a power generation system that couples the waste heat of electrolytic flue gas, the waste heat of compressed air and air energy storage, which can improve the utilization efficiency of waste heat of electrolytic flue gas; achieve cascade utilization of waste heat by combining with the waste heat energy of air compressor; and achieve deep peak shaving of compressed air system in aluminum electrolysis plant by utilizing compressed air energy storage, thereby reducing venting.

[0005] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0006] A power generation system coupling waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage includes a compressed air waste heat energy unit, an air energy storage power generation unit, and an electrolytic flue gas waste heat power generation unit. In the compressed air waste heat energy unit, air undergoes initial pressurization and initial cooling, with one supply to users and the other undergoing secondary pressurization and secondary cooling before storage. The air energy storage power generation unit releases the stored air, heats it, generates electricity, and then depressurizes it before supplying it to users. The compressed air waste heat energy unit exchanges heat with the electrolytic flue gas waste heat power generation unit through cooling water. The air energy storage power generation unit absorbs heat from organic matter in the electrolytic flue gas waste heat power generation unit, and the electrolytic flue gas waste heat power generation unit uses the waste heat from the electrolytic flue gas to heat the organic matter, with the organic matter vapor generating electricity.

[0007] Furthermore, the compressed air waste heat energy unit includes a medium-pressure air compressor, a No. 1 air cooler, a high-pressure air compressor, a No. 2 air cooler, and a high-pressure air storage tank. The output end of the medium-pressure air compressor is connected to the No. 1 air cooler. The output end of the No. 1 air cooler is divided into two paths: one path is connected to the user at the electrolytic aluminum plant, and the other path is connected to the input end of the high-pressure air compressor. The output end of the high-pressure air compressor is connected to the No. 2 air cooler. The output end of the No. 2 air cooler is connected to the high-pressure air storage tank. The No. 1 air cooler is connected to the heat exchanger in the electrolytic flue gas waste heat power generation unit. The No. 2 air cooler is connected to the heat exchanger in the electrolytic flue gas waste heat power generation unit.

[0008] Furthermore, the air energy storage power generation unit allows the high-pressure air stored in the compressed air waste heat energy unit to enter the air heater. The output end of the air heater is connected to the input end of the air turbine. The air turbine is connected to generator #1. The air outlet of the air turbine is connected to the output end of air cooler #1. The air heater is connected to the cooler in the electrolytic flue gas waste heat power generation unit.

[0009] Furthermore, the waste heat power generation unit for electrolytic flue gas includes an organic matter evaporator, which is connected to the input end of an organic matter turbine, which is connected to generator #2; the organic matter outlet of the organic matter turbine is connected to the air heater of an air energy storage power generation unit, the tube-side outlet of the air heater of the air energy storage power generation unit is connected to an organic matter condenser, which is connected to an organic matter storage tank; the organic matter storage tank is connected to an organic matter pump; the organic matter pump is connected to heat exchanger #1; heat exchanger #1 is connected to heat exchanger #2; and heat exchanger #2 is connected to the organic matter evaporator.

[0010] Furthermore, the electrolytic flue gas of the electrolytic flue gas waste heat power generation unit comes from the electrolytic cell and enters the organic matter evaporator. The electrolytic flue gas is provided with a bypass pipeline, and the flue gas outlet of the organic matter evaporator is connected to a fan, which is connected to a chimney.

[0011] Furthermore, the No. 1 and No. 2 air coolers are equipped with bypasses that connect to the external circulating water.

[0012] Furthermore, the organic matter evaporator is equipped with a flue gas bypass system.

[0013] Furthermore, in the organic matter evaporator, the organic matter flows through the tube side and the flue gas flows through the shell side. The organic matter in the flue gas is converted into organic matter vapor in the organic matter evaporator with a pressure of 1.0 MPa. After the organic matter turbine does work, the pressure is reduced to 0.15 MPa.

[0014] Furthermore, the cooling medium for the No. 1 and No. 2 air coolers is circulating water. The circulating water connects the No. 1 air cooler to the heat exchanger of the electrolytic flue gas waste heat power generation unit, and the No. 2 air cooler to another heat exchanger of the electrolytic flue gas waste heat power generation unit.

[0015] The beneficial effects of this invention are: this invention provides a power generation system that couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, which can improve the utilization efficiency of waste heat from electrolytic flue gas; it can achieve cascade utilization of waste heat by combining with waste heat energy from air compressors; and it can achieve deep peak shaving of compressed air system in aluminum electrolysis plant by utilizing compressed air energy storage, thereby reducing venting. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a power generation system used in this application to couple waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage.

[0017] In the diagram: 1. Medium-pressure air compressor; 2. Air cooler #1; 3. High-pressure air compressor; 4. Air cooler #2; 5. High-pressure air tank; 6. Air heater; 7. Air turbine; 8. Generator #1; 9. Organic matter evaporator; 10. Organic matter turbine; 11. Generator #2; 12. Organic matter condenser; 13. Organic matter storage tank; 14. Organic matter pump; 15. Heat exchanger #1; 16. Heat exchanger #2; 17. Air cooler #1 circulating pump; 18. Air cooler #2 circulating pump; 19. Fan; 20. Chimney; Valves V1~V7. Detailed Implementation

[0018] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] This invention provides a power generation system coupling waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage. The system includes a compressed air waste heat energy unit, an air energy storage power generation unit, and an electrolytic flue gas waste heat power generation unit. In the compressed air waste heat energy unit, air undergoes initial pressurization and cooling, with one supply to the user and the other undergoing secondary pressurization and cooling before storage. The air energy storage power generation unit releases the stored air, heats it, generates electricity, and then depressurizes it before supplying it to the user. The compressed air waste heat energy unit exchanges heat with the electrolytic flue gas waste heat power generation unit via cooling water. The air energy storage power generation unit absorbs heat from organic matter in the electrolytic flue gas waste heat power generation unit, and the electrolytic flue gas waste heat power generation unit uses the waste heat from the electrolytic flue gas to heat the organic matter, generating electricity from the organic matter vapor.

[0020] The compressed air waste heat unit draws air into a medium-pressure air compressor for pressurization. An air cooler is installed after the medium-pressure air compressor, using circulating water as the cooling medium. The circulating water absorbs heat from the compressed air and then enters a heat exchanger to indirectly exchange heat with the organic matter in the electrolytic flue gas waste heat power generation unit. The organic matter heats up, and the circulating water cools down before being recycled. Compressed air cooled by the air cooler is supplied to users in one route, while the cooled compressed air enters a high-pressure air compressor to further increase its pressure. After being cooled by the air cooler, it enters a high-pressure air storage tank for storage. The air cooler also uses circulating water as the cooling medium. The circulating water absorbs heat from the compressed air and then enters the heat exchanger in the electrolytic flue gas waste heat power generation unit to indirectly exchange heat with the organic matter. The organic matter heats up, and the circulating water cools down before being recycled.

[0021] During peak electricity and gas consumption periods, the air-based energy storage and power generation unit releases the pressure energy of air from a high-pressure storage tank to generate electricity. Before entering the air turbine, the compressed air is preheated by an air heater to increase its temperature and work capacity. The heating medium for the air heater is organic matter from the waste heat power generation unit derived from electrolytic flue gas. After being cooled and depressurized by the air turbine, the air is connected to the plant's compressed air network and supplied to users in the electrolytic aluminum plant. The air turbine then drives a generator to generate electricity.

[0022] On the organic matter side of the electrolysis flue gas waste heat power generation unit: the organic matter exchanges heat with the electrolysis flue gas in the evaporator and is heated to become organic matter vapor. The organic matter vapor enters the organic matter turbine to drive the generator to generate electricity. In the turbine, the temperature and pressure of the organic matter decrease to become low-pressure steam. The low-pressure steam organic matter enters the air heater device of the air energy storage power generation unit. In the air heater device, the air is heated and the organic matter is cooled. An organic matter condenser (final cooling) is set after the air heater. The cooling medium of the organic matter condenser is external circulating water. Under the cooling of the circulating water, the organic matter is completely liquefied and stored in the organic matter storage tank. The organic matter enters the heat exchanger for preheating through the organic matter pump. The organic matter exchanges heat with the circulating water, and the circulating water exchanges heat with the waste heat of the compressed air. The circulating water acts as the heat transfer medium, indirectly utilizing the waste heat of the compressed air. The preheated organic matter enters the heat exchanger for reheating. The organic matter undergoes another preheating process and finally enters the main heating device, the organic matter evaporator, to absorb the waste heat of the electrolysis flue gas and enter the next cycle.

[0023] In the waste heat power generation unit for electrolytic flue gas, the flue gas released from the electrolytic cell is collected and enters the organic matter evaporator. After being cooled, the flue gas is discharged into the chimney by a fan. The organic matter evaporator is equipped with a bypass for the electrolytic flue gas. In the event of an accident in the waste heat power generation unit for electrolytic flue gas, the bypass valve is activated, and the electrolytic flue gas is discharged into the chimney by a fan.

[0024] Specifically, such as Figure 1As shown, the present invention provides a power generation system that couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, including a medium-pressure air compressor 1, a #1 air cooler 2, a high-pressure air compressor 3, a #2 air cooler 4, a high-pressure air storage tank 5, an air heater 6, an air turbine 7, a #1 generator 8, an organic matter evaporator 9, an organic matter turbine 10, a #2 generator 11, an organic matter condenser 12, an organic matter storage tank 13, an organic matter pump 14, a #1 heat exchanger 15, a #2 heat exchanger 16, a #1 air cooler circulation pump 17, a #2 air cooler circulation pump 18, a fan 19, a chimney 20, and valves V1 to V7.

[0025] Compressed air waste heat energy unit: The output end of the medium-pressure air compressor 1 is connected to the No. 1 air cooler 2; the output end of the No. 1 air cooler 2 is divided into two paths, one directly providing medium-pressure compressed air to the electrolytic aluminum plant user, and the other connected to the input end of the high-pressure air compressor 3; the output end of the high-pressure air compressor 3 is connected to the No. 2 air cooler 4; the No. 2 air cooler 4 is connected to the high-pressure air storage tank 5; the No. 1 air cooler is connected to the No. 2 heat exchanger 16 through the No. 1 air cooler circulation pump 17; the No. 2 air cooler is connected to the No. 1 heat exchanger 15 through the No. 2 air cooler circulation pump 18.

[0026] Air is drawn into the medium-pressure air compressor 1. After compression, the air temperature rises, which cannot meet the requirements of the electrolytic aluminum plant's production users. Therefore, an air cooler 2 (No. 1) is installed after the medium-pressure air compressor 1. The cooling medium of the air cooler 2 is circulating water. After absorbing the heat from the compressed air, the circulating water enters the heat exchanger 16 (No. 2) and indirectly exchanges heat with the organic matter in the electrolytic flue gas waste heat power generation unit. The organic matter heats up, and the circulating water cools down before being recycled. Compressed air cooled by the air cooler 2 is supplied to users in one route, and the cooled compressed air enters the high-pressure air compressor 3 to further increase its pressure. After being cooled by the air cooler 4 (No. 2), it enters the high-pressure air storage tank 5 for storage. The cooling medium of the air cooler 4 (No. 2) is also circulating water. After absorbing the heat from the compressed air, the circulating water enters the heat exchanger 15 (No. 1) and indirectly exchanges heat with the organic matter in the electrolytic flue gas waste heat power generation unit. The organic matter heats up, and the circulating water cools down before being recycled.

[0027] Air energy storage power generation unit: The high-pressure air storage tank 5 is connected to the air heater 6; the output end of the air heater is connected to the input end of the air turbine 7; the air turbine 7 is connected to the No. 1 generator 8; the air outlet of the air turbine 7 is connected to the output end of the No. 1 air cooler 2; the air heater 6 is connected to the organic matter cooler 10 in the flue gas waste heat power generation unit.

[0028] During peak electricity and gas consumption periods, the pressure energy of the high-pressure compressed air in the high-pressure air storage tank 5 is released to generate electricity. Before entering the air turbine 7, the high-pressure compressed air in the high-pressure air storage tank 5 is preheated by an air heater 6 to increase the temperature of the compressed air and improve its work capacity. The heating medium of the air heater 6 is organic matter from the waste heat power generation unit of the electrolytic flue gas. After the air is cooled and depressurized by the air turbine 7, it is connected to the compressed air pipeline network of the plant and supplied to the users of the electrolytic aluminum plant. The air turbine 7 drives the No. 1 generator 8 to generate electricity.

[0029] Electrolytic flue gas waste heat power generation unit:

[0030] Organic matter side: The organic matter evaporator 9 is connected to the input end of the organic matter turbine 10; the organic matter turbine 10 is connected to generator #2 11; the organic matter outlet of the organic matter turbine 10 is connected to the air heater 6 of the air energy storage power generation unit; the tube-side outlet of the air heater 6 is connected to the organic matter condenser 12; the organic matter condenser 12 is connected to the organic matter storage tank 13; the organic matter storage tank 13 is connected to the organic matter pump 14; the organic matter pump 14 is connected to heat exchanger #1 15; the heat exchanger #1 15 is connected to heat exchanger #2 16; the heat exchanger #2 16 is connected to the organic matter evaporator 9.

[0031] The organic matter is heated by heat exchange with the electrolytic flue gas in the evaporator 9, turning into organic matter vapor. This vapor then enters the organic matter turbine 9, driving generator #2 11 to generate electricity. In the turbine 9, the organic matter vapor's thermal energy is converted into mechanical energy, reducing its temperature and pressure to low-pressure steam. This low-pressure steam then enters the air heater 6 of the air energy storage and power generation unit. In the air heater 6, the air is heated while the organic matter is cooled. To completely cool the organic matter vapor into liquid organic matter, an organic matter condenser 12 is installed after the air heater 6. The cooling medium in the organic matter condenser 12 is external circulating water. Under the cooling of the circulating water, the organic matter completely liquefies and is stored in the organic matter storage tank 13. The organic matter is preheated by the organic matter pump 14 into heat exchanger #1 15. The organic matter exchanges heat with the circulating water, heating up the organic matter and cooling the circulating water. The circulating water also exchanges heat with the waste heat of the compressed air, heating up the circulating water and cooling the compressed air. The circulating water serves as the heat transfer medium, indirectly utilizing the waste heat of the compressed air. The preheated organic matter enters heat exchanger 16 (No. 2) for another heating process. After another preheating process, the organic matter finally enters the main heating device, organic matter evaporator 9, to absorb the waste heat of the electrolysis flue gas and enter the next cycle.

[0032] Flue gas side: Electrolysis flue gas comes from the electrolytic cell and enters the organic matter evaporator 9. The electrolysis flue gas is provided with a bypass pipeline. The flue gas outlet of the organic matter evaporator 9 is connected to the fan 19. The fan 19 is connected to the chimney 20.

[0033] The flue gas released from the electrolytic cell is collected and enters the organic matter evaporator 9. After being cooled, the flue gas is discharged into the chimney 20 via the fan 19. The organic matter evaporator 9 is equipped with a bypass for the flue gas. In the event of an accident in the waste heat power generation unit of the flue gas, the bypass valve V7 is activated, and the flue gas is discharged into the chimney 20 via the fan 19.

[0034] Specifically, during periods of low daily air load, to reduce the venting of low-pressure air compressor 1 and avoid energy waste, compressed air needs to be stored. This involves starting high-pressure air compressor 3 and simultaneously activating cooling water circulation pump 17. Cooling water exchanges heat with the high-temperature compressed air in air cooler 4, lowering the temperature and reducing the volume of the high-pressure compressed air, which helps to reduce the volume of high-pressure air storage tank 5. Simultaneously, the cooling water absorbs heat from the high-temperature air and transfers this heat to the organic matter through heat exchanger 16, preheating the organic matter. The cooled water is then recycled.

[0035] Specifically, during peak electricity and gas consumption periods, the high-pressure air storage tank 5 releases compressed air for energy storage. To improve the work capacity of the air turbine 7, it exchanges heat with organic matter discharged from the organic matter turbine 9 in the air heater 6, raising the temperature of the compressed air while simultaneously cooling the organic matter. After preheating, the high-pressure compressed air enters the air turbine 7 to drive the generator 8 to generate electricity. The generated high-pressure compressed air becomes medium-pressure compressed air (~0.6MPa) and is discharged from the air turbine, connecting to the original compressed air pipeline system and supplied to users. In this process, the energy stored in the compressed air is converted into electrical energy, reducing plant power consumption and supplementing the shortage of compressed air.

[0036] Specifically, when the waste heat power generation unit of electrolytic flue gas malfunctions, the organic matter cannot exchange heat with the cooling water in heat exchangers 1 and 2. In order to ensure the normal operation of the compressed air system of the compressed air heat energy utilization unit, V3, V4, V5, and V6 are shut down, and the external circulating water directly cools the high-temperature compressed air.

[0037] The organic matter after the turbine is equipped with a pre-cooling section. The pre-cooling medium comes from the compressed air of the compressed air energy storage and power generation unit. Pre-cooling effectively reduces the amount of cooling water used for organic matter.

[0038] Specifically, in the organic matter evaporator, the organic matter flows through the tube side, and the flue gas flows through the shell side; the organic matter in the flue gas is converted into organic matter vapor in the evaporator at ~1.0MPa, and after the organic matter turbine does work, the pressure is reduced to ~0.15MPa.

[0039] The specific organic evaporator is equipped with a flue gas bypass system. In the event of a system failure, the system can be effectively shut off, and the electrolysis flue gas can be discharged from the chimney by an induced draft fan without affecting the production process.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any modifications, alterations, substitutions, and variations made by those skilled in the art to the above embodiments are within the scope of the present invention.

Claims

1. A power generation system that couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, characterized in that: The system includes a compressed air waste heat energy unit, an air energy storage power generation unit, and an electrolytic flue gas waste heat power generation unit. In the compressed air waste heat energy unit, air undergoes initial pressurization and initial cooling, with one supply to users and the other undergoing secondary pressurization and secondary cooling before storage. The air energy storage power generation unit releases the stored air, heats it, generates electricity, and then depressurizes it before supplying it to users. The compressed air waste heat energy unit exchanges heat with the electrolytic flue gas waste heat power generation unit through cooling water. The air energy storage power generation unit absorbs heat from the organic matter in the electrolytic flue gas waste heat power generation unit, which uses the waste heat from the electrolytic flue gas to heat the organic matter, and the organic matter vapor generates electricity. The compressed air waste heat energy unit includes a medium-pressure air compressor (1) and a No. 1 air compressor. Cooler (2), high-pressure air compressor (3), No. 2 air cooler (4), high-pressure air storage tank (5). The output end of the medium-pressure air compressor (1) is connected to the No. 1 air cooler (2). The output end of the No. 1 air cooler (2) is divided into two paths, one path is connected to the user of the electrolytic aluminum plant, and the other path is connected to the input end of the high-pressure air compressor (3). The output end of the high-pressure air compressor (3) is connected to the No. 2 air cooler (4). The output end of the No. 2 air cooler (4) is connected to the high-pressure air storage tank (5). The No. 1 air cooler (2) is connected to the No. 2 heat exchanger (16) in the electrolytic flue gas waste heat power generation unit. The No. 2 air cooler (4) is connected to the No. 1 heat exchanger (15) in the electrolytic flue gas waste heat power generation unit.

2. The power generation system according to claim 1, which couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, is characterized in that: The air energy storage power generation unit allows the high-pressure air stored in the compressed air waste heat energy unit to enter the air heater (6). The output end of the air heater (6) is connected to the input end of the air turbine (7). The air turbine (7) is connected to the No. 1 generator (8). The air outlet of the air turbine (7) is connected to the output end of the No. 1 air cooler (2). The air heater (6) is connected to the cooler in the electrolytic flue gas waste heat power generation unit.

3. The power generation system according to claim 1, which couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, is characterized in that: The waste heat power generation unit of the electrolytic flue gas includes an organic matter evaporator (9), which is connected to the input end of an organic matter turbine (10), which is connected to a generator (11) #2. The organic matter outlet of the organic matter turbine (10) is connected to the air heater of the air energy storage power generation unit, and the tube-side outlet of the air heater of the air energy storage power generation unit is connected to an organic matter condenser (12). The organic matter condenser (12) is connected to an organic matter storage tank (13). The organic matter storage tank (13) is connected to an organic matter pump (14). The organic matter pump (14) is connected to a heat exchanger (15) #1. The heat exchanger (15) #1 is connected to a heat exchanger (16) #2. The heat exchanger (16) #2 is connected to the organic matter evaporator (9).

4. The power generation system according to claim 3, which couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, is characterized in that: The electrolytic flue gas of the waste heat power generation unit comes from the electrolytic cell and enters the organic matter evaporator (9). The electrolytic flue gas is provided with a bypass pipeline. The flue gas outlet of the organic matter evaporator (9) is connected to the fan (19) and the fan (19) is connected to the chimney (20).

5. The power generation system according to claim 1, which couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, is characterized in that: The No. 1 air cooler (2) and the No. 2 air cooler (4) are equipped with bypasses that connect to the external circulating water.

6. The power generation system according to claim 4, which couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, is characterized in that: The organic matter evaporator (9) is equipped with a flue gas bypass system.

7. The power generation system according to claim 3, which couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, is characterized in that: In the organic matter evaporator (9), the organic matter flows through the tube side and the flue gas flows through the shell side. The organic matter in the flue gas is converted into organic matter vapor in the organic matter evaporator (9) with a pressure of 1.0 MPa. After the organic matter turbine (10) does work, the pressure is reduced to 0.15 MPa.

8. The power generation system according to claim 1, which couples waste heat from electrolytic flue gas, waste heat from compressed air, and air energy storage, is characterized in that: The cooling medium of the No. 1 air cooler (2) and the No. 2 air cooler (4) is circulating water. The circulating water connects the No. 1 air cooler (2) with the No. 2 heat exchanger (16) of the electrolytic flue gas waste heat power generation unit, and the No. 2 air cooler (4) with the No. 1 heat exchanger (15) of the electrolytic flue gas waste heat power generation unit.

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