A power generation system that stores pressure by compressing flue gas

Abstract

The present invention relates to the field of power generation technology, and specifically relates to a power generation system that utilizes flue gas compression for pressure storage, including: the steam inlet end of the feedwater heater is connected to the steam extraction end of the steam turbine; the flue gas compressor is connected to the boiler flue gas outlet; the steam inlet of the first heat exchanger is connected to the flue gas compressor, and the water inlet end of the first heat exchanger is connected to the pipeline between the condenser and the feedwater heater; the first heat exchanger uses the flue gas transported by the flue gas compressor to heat the condensate water of the condenser to form pressurized water; the water inlet of the pressure vessel is connected to the water outlet end of the first heat exchanger; the water outlet of the pressure vessel is connected to the pipeline between the feedwater heater and the boiler; the pressure vessel has a pressure storage state for storing pressurized water; and a pressure release state for releasing pressurized water into the boiler; this application utilizes flue gas compression for pressure storage to achieve deep peak shaving; uses feedwater to absorb the heat of the flue gas to improve the thermal efficiency of the boiler; and realizes rapid load change to meet the peak shaving and frequency modulation requirements after renewable energy is connected to the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and particularly relates to a power generation system using flue gas compression for pressure storage. Background Art

[0002] With the sharp increase in the utilization of renewable energy such as solar energy and wind energy globally, their characteristics such as volatility, intermittency, and unpredictability pose a huge challenge to the stable and safe operation of the power grid. In the current power system, coal-fired generating units have changed from the main power supply to participating in deep peak shaving in coordination with the power grid. Therefore, coal-fired generating units need to perform frequent peak shaving and frequency modulation to ensure the safe and stable operation of the power grid.

[0003] However, the frequency modulation ability of coal-fired generating units is limited by the large thermal inertia inside the boiler, making it difficult for the load change rate to meet the requirements of more and more renewable energy being connected to the grid. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the load change rate of coal-fired generating units is difficult to meet the requirements of more and more renewable energy being connected to the grid. Based on the above situation, it is very necessary to develop a power generation system that can meet the requirements of renewable energy being connected to the grid.

[0005] To achieve the above object, the present invention provides a power generation system using flue gas compression for pressure storage, including:

[0006] A boiler, a steam turbine, a condenser, and a feed water heater connected in sequence; the steam inlet end of the feed water heater is connected to the steam extraction end of the steam turbine; the steam turbine is connected to a generator; the water outlet end of the feed water heater is connected to the boiler;

[0007] A flue gas compressor, connected to the flue gas outlet of the boiler, and the flue gas compressor is electrically connected to the generator;

[0008] A first heat exchanger, with its air inlet connected to the flue gas compressor, and the water inlet end of the first heat exchanger is connected through a second valve to the pipeline between the condenser and the feed water heater; the first heat exchanger is adapted to heat the condensed water diverted from the condenser with the flue gas compressed and transported by the flue gas compressor to form pressurized water;

[0009] A pressure vessel, with its water inlet connected to the water outlet end of the first heat exchanger; the water outlet of the pressure vessel is connected through a third valve to the pipeline between the feed water heater and the boiler;

[0010] The pressure vessel has a pressure storage state for storing pressurized water; and a pressure release state for releasing pressurized water into the boiler;

[0011] An air compressor, connected to the pressure vessel; the air compressor is adapted to maintain the pressure inside the pressure vessel.

[0012] Optionally, it further includes:

[0013] A pressure-bearing structure connected to the gas outlet of the first heat exchanger;

[0014] A second heat exchanger disposed between the pressure vessel and the boiler;

[0015] A flue gas heater disposed in the boiler, and the inlet of the flue gas heater is connected to the pressure-bearing structure through a first valve, and the outlet of the flue gas heater is connected to the inlet of the second heat exchanger.

[0016] Optionally, it further includes:

[0017] A flue gas expander disposed between the outlet of the flue gas heater and the inlet of the second heat exchanger.

[0018] Optionally, it further includes:

[0019] A water turbine disposed between the pressure vessel and the second heat exchanger; the water turbine is adapted to rotate under the pressure of the water conveyed by the pressure vessel, and the used water is then conveyed into the second heat exchanger.

[0020] Optionally, a first pump is provided between the first heat exchanger and the condenser.

[0021] Optionally, the flue gas entering the flue gas compressor is the flue gas after denitrification and desulfurization.

[0022] Optionally, the pressure-bearing structure is a pressure tank, a salt cave or a mine cave.

[0023] Optionally, the number of the air compressors is multiple, and the number of the flue gas expanders is multiple.

[0024] Optionally, the flue gas heater is disposed in the horizontal flue of the boiler.

[0025] Optionally, the pressure in the pressure-bearing structure is not less than 60 bar, and the pressure in the pressure vessel is not less than 60 bar.

[0026] The above technical solution of the present invention has the following advantages compared with the prior art:

[0027] 1. The power generation system using flue gas compression for energy storage provided by the present invention includes: a boiler, a steam turbine, a condenser, and a feedwater heater connected in sequence; the steam inlet end of the feedwater heater is connected to the steam extraction end of the steam turbine; the steam turbine is connected to a generator; the water outlet end of the feedwater heater is connected to the boiler; a flue gas compressor, connected to the flue gas outlet of the boiler, and the flue gas compressor is electrically connected to the generator; a first heat exchanger, the air inlet of which is connected to the flue gas compressor, and the water inlet end of the first heat exchanger is connected to the pipeline between the condenser and the feedwater heater through a second valve; the first heat exchanger is adapted to heat the condensed water diverted from the condenser with the flue gas compressed and transported by the flue gas compressor to form pressurized water; a pressure vessel, the water inlet of which is connected to the water outlet end of the first heat exchanger; the water outlet of the pressure vessel is connected to the pipeline between the feedwater heater and the boiler through a third valve; the pressure vessel has a pressure storage state for storing pressurized water and a pressure release state for releasing pressurized water into the boiler; an air compressor, connected to the pressure vessel; the air compressor is adapted to maintain the pressure inside the pressure vessel; By adopting the above technical solutions in this application, through flue gas compression for energy storage, the flue gas compressor consumes the electric energy of the generator to overcome the thermal inertia inside the boiler. While realizing deep peak shaving of the power generation system during the energy storage process, the condensed water of the condenser is used to absorb the excess heat in the flue gas, effectively reducing the boiler flue gas loss by more than 50%, improving the thermal efficiency of the boiler, and realizing the cross-time and space utilization of flue gas waste heat by using feedwater compression for energy storage. The heat exchange process between the flue gas and the condensed water is a single-phase heat exchange, with a well-matched heat exchange temperature zone, effectively reducing the irreversible loss of heat exchange and improving the energy utilization efficiency. During the energy release process, the flue gas compression for energy storage and the feedwater compression for energy storage release energy synchronously, realizing the rapid load change of the power generation system. Specifically: the feedwater flow rate entering the feedwater heater from the condenser decreases correspondingly with the release of high-pressure feedwater, ensuring that the feedwater flow rate entering the boiler remains basically unchanged. At this time, the water-to-coal ratio of the boiler remains unchanged, and the heat load remains unchanged. However, the feedwater entering the feedwater heater decreases, and the steam extraction amount of the steam turbine entering the feedwater heater decreases correspondingly, increasing the through-flow rate of the steam turbine and improving the output power of the steam turbine; expanding the load change range and increasing the load change rate. The minimum load can be reduced to 0 MW at most, and the load change rate can be increased from the traditional 1 - 1.5% Pe0 / min to 2.85% Pe0 / min, meeting the peak shaving and frequency modulation requirements after more and more renewable energy sources are connected to the power grid. In addition, by integrating the flue gas compression for energy storage and the feedwater compression for heat storage technologies, the existing working medium of the coal-fired power generation unit can be used for transformation without adding additional energy storage media, and the transformation cost is lower. Moreover, by adjusting the power of the air compressor, the high-pressure air flow rate entering the pressure vessel is controlled to ensure the pressure of the high-pressure feedwater during the release process.

[0028] 2. The power generation system using flue gas compression for pressure storage provided by the present invention further includes: a pressure-bearing structure connected to the outlet of the first heat exchanger; a second heat exchanger disposed between the pressure vessel and the boiler; a flue gas heater disposed in the boiler, and an inlet of the flue gas heater is connected to the pressure-bearing structure through a first valve, and an outlet of the flue gas heater is connected to an inlet of the second heat exchanger. By adopting the above technical solution, the present application further improves the pressure storage capacity and level through the pressure-bearing structure. Specifically: when filling the pressure-bearing structure with flue gas, the flue gas compressor is used to make the pressure of the flue gas in the pressure-bearing structure reach the storage condition. And the compressed flue gas is heated by the flue gas heater to increase the temperature of the flue gas; the heated flue gas is transported to the second heat exchanger to further increase the temperature of the water flowing back to the boiler.

[0029] 3. The power generation system using flue gas compression for pressure storage provided by the present invention further includes: a flue gas expander disposed between the outlet of the flue gas heater and the inlet of the second heat exchanger. By adopting the above technical solution, the present application makes full use of the high-temperature and high-pressure flue gas to drive the flue gas expander to do work, improving the energy utilization efficiency.

[0030] 4. The power generation system using flue gas compression for pressure storage provided by the present invention further includes: a water turbine disposed between the pressure vessel and the second heat exchanger; the water turbine is adapted to rotate under the pressure of the water transported by the pressure vessel, and the used water is then transported into the second heat exchanger. By adopting the above technical solution, the present application realizes the energy release of the pressure water without pressure release through compressed air, enabling the water turbine to operate at high efficiency and improving the energy utilization efficiency.

[0031] 5. The present invention is provided with a first pump between the first heat exchanger and the condenser. By adopting the above technical solution, the flow rates of the compressed flue gas and the feed water are respectively adjusted by adjusting the power of the flue gas compressor and the power of the first pump, so that the heat absorption of the feed water matches the heat release of the flue gas, reducing the temperature of the flue gas discharged from the first heat exchanger and improving the energy utilization rate.

[0032] 6. The flue gas entering the flue gas compressor is the flue gas after denitrification and desulfurization. By adopting the above technical solution, the flue gas after denitrification and desulfurization has a higher temperature; the high-temperature flue gas is fully utilized for energy storage and energy release, reducing the exhaust gas loss of the boiler and improving the thermal efficiency of the boiler; at the same time, preventing the finally discharged flue gas from polluting the environment.

[0033] 7. The pressure-bearing structure of the present invention is a pressure tank, a salt cave or a mine cave. By adopting the above technical solution, various forms of the pressure-bearing structure are defined, reducing the transformation cost of the power generation system.

[0034] 8. The number of the air compressors in the present invention is multiple, and the number of the flue gas expanders is multiple; by adopting the above technical solution, the pressure level in the pressure-bearing structure is rapidly increased by setting multiple air compressors; and the work efficiency of the flue gas is improved by setting multiple flue gas expanders.

[0035] 9. The flue gas heater in the present invention is arranged in the horizontal flue of the boiler; by adopting the above technical solution, the waste heat of the boiler flue gas is fully utilized to further heat the flue gas, so as to increase the temperature of the flue gas and improve the work capacity or energy storage level.

[0036] 10. The pressure in the pressure-bearing structure in the present invention is not less than 60 bar, and the pressure in the pressure vessel is not less than 60 bar; by adopting the above technical solution, the lower limit values of the pressures in the pressure-bearing structure and the pressure vessel are specifically defined to ensure the pressure storage capacity and level.

[0037] HA202300538 BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are 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 efforts.

[0039] Figure 1 It is a schematic connection structure diagram of the power generation system using flue gas compression for pressure storage provided in the embodiment of the present invention;

[0040] Figure 2 It is a schematic diagram of the comparison of flue gas losses between the power generation system using flue gas compression for pressure storage provided in the embodiment of the present invention and a traditional coal-fired power generation unit;

[0041] Figure 3 It is a schematic diagram of the comparison of load change rates between the power generation system using flue gas compression for pressure storage provided in the embodiment of the present invention and a traditional coal-fired power generation unit.

[0042] DESCRIPTION OF REFERENCE NUMERALS:

[0043] 1. Boiler; 2. Steam turbine; 3. Condenser; 4. Feedwater heater; 5. Flue gas compressor; 6. First heat exchanger; 7. Pressure-bearing structure; 8. First valve; 9. Flue gas heater; 10. Flue gas expander; 11. Second heat exchanger; 12. Second valve; 13. First pump; 14. Pressure vessel; 15. Air compressor; 16. Third valve; 17. Water turbine; 18. Second pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention. HA202300538

[0045] Embodiments all fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] As Figures 1 to 3 shown, a specific embodiment of a power generation system using flue gas compression for energy storage, which is particularly suitable for regulating the load within the range of 20 MW, the power generation system using flue gas compression for energy storage specifically includes: a boiler 1, a steam turbine 2, a condenser 3, and a feedwater heater 4 connected in sequence; a flue gas compressor 5, a first heat exchanger 6, a pressure vessel 14, a water turbine 17, a second heat exchanger 11, and a second pump 18 connected in sequence; a pressure-bearing structure 7, a flue gas heater 9, and a flue gas expander 10 connected in sequence; and an air compressor 15 connected to the pressure vessel 14, etc. Specifically, the boiler 1 is a coal-fired boiler; the second pump 18 is a water pump.

[0050] As Figure 1As shown, the steam turbine 2 is connected to the generator; the water outlet end of the feedwater heater 4 is connected to the boiler 1; the flue gas compressor 5 is connected to the flue gas outlet of the boiler 1, and the flue gas entering the flue gas compressor 5 is the flue gas after denitrification and desulfurization. And the flue gas compressor 5 is electrically connected to the generator; the air inlet of the first heat exchanger 6 is connected to the flue gas compressor 5, and the water inlet end of the first heat exchanger 6 is connected to the pipeline between the condenser 3 and the feedwater heater 4 through the second valve 12; the second valve 12 is a regulating valve. The first heat exchanger 6 is adapted to heat the condensed water diverted from the condenser 3 by the flue gas compressed and conveyed by the flue gas compressor 5 to form pressurized water; the water inlet of the pressure vessel 14 is connected to the water outlet end of the first heat exchanger 6; the water outlet of the pressure vessel 14 is connected to the pipeline between the feedwater heater 4 and the boiler 1 through the third valve 16; the third valve 16 is a regulating valve. The pressure vessel 14 has a pressure storage state for storing pressurized water; and a pressure release state for releasing pressurized water into the boiler 1; specifically, the pressure vessel 14 is a pressure tank. The air compressor 15 is adapted to maintain the pressure inside the pressure vessel 14, and the pressure inside the pressure vessel 14 is not less than 60 bar. A first pump 13 is provided between the first heat exchanger 6 and the condenser 3. The first pump 13 is a water pump. The feedwater pressure entering the pressure tank after being boosted by the water pump is not less than 50 bar, and the feedwater can enter the pressure tank by means of spraying through a spray generator or directly through a pipeline connection method.

[0051] The pressure-bearing structure 7 is connected to the air outlet of the first heat exchanger 6; specifically, the pressure-bearing structure 7 is a pressure tank, a salt cavern, a mine cavern, etc.; the salt cavern or mine cavern can be an existing cavern or a specially excavated cavern. The pressure inside the pressure-bearing structure 7 is not less than 60 bar. The flue gas heater 9 is arranged in the horizontal flue of the boiler 1, and the air inlet of the flue gas heater 9 is connected to the pressure-bearing structure 7 through the first valve 8, and the first valve 8 is a regulating valve. The air outlet of the flue gas heater 9 is connected to the air inlet of the second heat exchanger 11. The flue gas expander 10 is arranged between the air outlet of the flue gas heater 9 and the air inlet of the second heat exchanger 11; the temperature of the flue gas entering the flue gas expander 10 is not less than 450 °C. The air outlet of the second heat exchanger 11 is communicated with the environment. The water turbine 17 is adapted to rotate under the pressure of the water conveyed by the pressure vessel 14, and the used water is then conveyed into the second heat exchanger 11. Further, the number of the air compressors 15 is multiple, and the number of the flue gas expanders 10 is multiple.

[0052] The main working process of the power generation system using flue gas compression for pressure storage described in this application is briefly described as follows:

[0053] When the coal-fired power generation unit needs to perform deep peak shaving, start the flue gas compressor 5, compress the flue gas to more than 60 bar, and send it into the first heat exchanger 6; open the second valve 12 and start the first pump 13; make the condensate water of the condenser 3 enter the first heat exchanger 6 to absorb the heat of the high-pressure flue gas, and the high-pressure flue gas that has completed heat exchange enters the pressure-bearing structure 7; the feed water that has completed heat exchange enters the pressure vessel 14; open the air compressor 15, and high-pressure air enters the pressure vessel 14, so that the feed water displaces the high-pressure air to increase the pressure in the pressure vessel 14 to form pressurized water; adjust the flow rates of the compressed flue gas and the feed water (i.e., condensate water) by adjusting the power of the flue gas compressor 5 and the power of the first pump 13 respectively, so that the heat absorption of the feed water matches the heat release of the flue gas, and reduce the temperature of the flue gas discharged from the first heat exchanger 6.

[0054] When releasing energy, open the first valve 8 to release the high-pressure flue gas from the pressure-bearing structure 7, enter the flue gas heater 9, after being heated in the boiler 1, enter the flue gas expander 10 to do work. Open the third valve 16 to release the high-pressure feed water from the pressure vessel 14 and enter the water turbine 17 to do work; start the air compressor 15, send high-pressure air into the pressure vessel 14, and control the flow rate of the high-pressure air entering the pressure vessel 14 by adjusting the power of the air compressor 15 to ensure that the pressure remains unchanged during the release process of the high-pressure feed water and improve the work efficiency of the water turbine 17. The flue gas after doing work and the feed water used by the water turbine 17 enter the second heat exchanger 11. After the flue gas releases heat, it is discharged into the environment. After the feed water absorbs heat, it enters the feed water inlet of the boiler 1 through the second pump 18. The flow rate of the feed water entering the feed water heater 4 from the condenser 3 decreases correspondingly with the release of the high-pressure feed water to ensure that the flow rate of the feed water entering the boiler 1 remains basically unchanged. At this time, the water-to-coal ratio of the boiler 1 remains unchanged, the heat load remains unchanged, but the feed water entering the feed water heater 4 decreases, and the extraction steam volume entering the feed water heater 4 decreases correspondingly, increasing the through-flow of the steam turbine 2 and improving the output power of the steam turbine 2.

[0055] As Figure 2 shown, taking a 660 MW ultra-supercritical coal-fired power generation unit as an example, after adopting the power generation system using flue gas compression and pressure storage described in this application, when deep peak shaving to 20% THA, the flue gas discharge loss is reduced from 27 MW to 13.3 MW.

[0056] As Figure 3 shown, taking a 660 MW ultra-supercritical coal-fired power generation unit as an example, after adopting the power generation system using flue gas compression and pressure storage described in this application, the load change rate of the coal-fired power generation unit is increased from the original 1.5% rated load per minute to 2.85% rated load per minute. Among them, the load change rate is defined as the change amount of the unit output power per unit time, and the change amount of power can be expressed as a percentage of the rated load. Assuming the rated load is Pe0, in Figure 3 it, the unit of the ordinate is %Pe0 / min, that is, % rated load per minute.

[0057] Therefore, after adopting the power generation system using flue gas compression for energy storage described in this application, the exhaust gas loss of the coal-fired power generation unit is significantly reduced, and the peak shaving and frequency modulation capabilities are significantly improved.

[0058] Obviously, the above-mentioned embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A power generation system using flue gas compression for pressure storage, characterized in that, Including: A boiler (1), a steam turbine (2), a condenser (3) and a feedwater heater (4) connected in sequence; the steam inlet end of the feedwater heater (4) is connected to the steam extraction end of the steam turbine (2); the steam turbine (2) is connected to a generator; the water outlet end of the feedwater heater (4) is connected to the boiler (1); A flue gas compressor (5), connected to the flue gas outlet of the boiler (1), and the flue gas compressor (5) is electrically connected to the generator; A first heat exchanger (6), the air inlet is connected to the flue gas compressor (5), and the water inlet end of the first heat exchanger (6) is connected to the pipeline between the condenser (3) and the feedwater heater (4) through a second valve (12); the first heat exchanger (6) is adapted to heat the condensed water diverted from the condenser (3) with the flue gas compressed and transported by the flue gas compressor (5) to form pressurized water; A pressure vessel (14), the water inlet is connected to the water outlet end of the first heat exchanger (6); the water outlet of the pressure vessel (14) is connected to the pipeline between the feedwater heater (4) and the boiler (1) through a third valve (16); The pressure vessel (14) has a pressure storage state for storing pressurized water; and a pressure release state for releasing pressurized water into the boiler (1); An air compressor (15), connected to the pressure vessel (14); the air compressor (15) is adapted to maintain the pressure inside the pressure vessel (14).

2. The power generation system using flue gas compression for pressure storage according to claim 1, wherein Further including: A pressure-bearing structure (7), connected to the air outlet of the first heat exchanger (6); A second heat exchanger (11), arranged between the pressure vessel (14) and the boiler (1); A flue gas heater (9), arranged inside the boiler (1), and the air inlet of the flue gas heater (9) is connected to the pressure-bearing structure (7) through a first valve (8), and the air outlet of the flue gas heater (9) is connected to the air inlet of the second heat exchanger (11).

3. The power generation system using flue gas compression for pressure storage according to claim 2, wherein, Further including: A flue gas expander (10), arranged between the air outlet of the flue gas heater (9) and the air inlet of the second heat exchanger (11).

4. The power generation system using flue gas compression for pressure storage according to claim 3, characterized in that, Further including: A water turbine (17), arranged between the pressure vessel (14) and the second heat exchanger (11); the water turbine (17) is adapted to rotate under the pressure of the water transported by the pressure vessel (14), and the used water is then transported into the second heat exchanger (11).

5. The power generation system using flue gas compression for pressure storage according to any one of claims 1-4, characterized in that, A first pump (13) is arranged between the first heat exchanger (6) and the condenser (3).

6. The power generation system using flue gas compression for pressure storage according to any one of claims 1-4, characterized in that, The flue gas entering the flue gas compressor (5) is the flue gas after denitrification and desulfurization.

7. The power generation system using flue gas compression for energy storage according to any one of claims 2 to 4, characterized in that, The pressure-bearing structure (7) is a pressure tank, a salt cave or a mine cave.

8. The power generation system using flue gas compression for energy storage according to claim 3 or 4, characterized in that, The number of the air compressors (15) is multiple, and the number of the flue gas expanders (10) is multiple.

9. The power generation system using flue gas compression for pressure storage according to any one of claims 2 to 4, characterized in that, The flue gas heater (9) is arranged in the horizontal flue of the boiler (1).

10. The power generation system using flue gas compression for energy storage according to any one of claims 2 to 4, characterized in that, The pressure inside the pressure-bearing structure (7) is not less than 60 bar, and the pressure inside the pressure vessel (14) is not less than 60 bar.

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