A power generation system integrating heat storage and pressure storage

Abstract

The application relates to the technical field of power generation, in particular to a power generation system integrating heat storage and pressure storage, which comprises a boiler, a medium-pressure steam turbine, a low-pressure steam turbine, a low-pressure heater, a deaerator and the like; the low-pressure heater is connected with the low-pressure steam turbine; a heat storage and heat release unit is connected to a pipeline between the medium-pressure steam turbine and the high-pressure steam turbine, has a heat storage state of storing heat energy by dividing and storing reheat steam, and has a heat release state of delivering water from the low-pressure heater to a pressure container; the second heat exchanger delivers the heated water to the deaerator; the application introduces external energy storage, combines heat storage and pressure storage technologies, realizes rapid frequency modulation by compressed air and water pressure storage, realizes deep peak regulation by heat storage, greatly increases a load operation interval, improves frequency modulation capacity, and meets the demand of frequent peak regulation and frequency modulation of renewable energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power generation, in particular to a power generation system integrating heat storage and pressure storage. BACKGROUND

[0002] With the rapid increase of the use of renewable energy such as solar energy and wind energy, the fluctuation, intermittence and unpredictability of the renewable energy bring great challenges to the stable and safe operation of the power grid. In the current power system, coal-fired generating units are an important source of electric energy supply, so frequent peak shaving and frequency modulation are required to ensure the safe and stable operation of the power grid. At present, the peak shaving and frequency modulation capacity of coal-fired generating units cannot meet the demand of the power grid, and the main constraint factor of the peak shaving capacity is the minimum stable combustion load of the boiler system, and the main constraint factor of the frequency modulation capacity is the large thermal inertia inside the boiler. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is to overcome the defect that coal-fired generating units are difficult to meet the frequent peak shaving and frequency modulation of renewable energy. Based on the above, it is necessary to develop a power generation system that can meet the frequent peak shaving and frequency modulation demand of renewable energy.

[0004] In order to achieve the above purpose, the present application provides a power generation system integrating heat storage and pressure storage, comprising:

[0005] a boiler, a high-pressure steam turbine, a medium-pressure steam turbine, a low-pressure steam turbine, a condenser, a low-pressure heater and a deaerator connected in sequence; the steam inlet end of the low-pressure heater is connected to the steam extraction end of the low-pressure steam turbine;

[0006] a heat storage and release unit, a pressure container and a second heat exchanger connected in sequence; the heat storage and release unit is connected to the second heat exchanger; the second heat exchanger is connected between the low-pressure heater and the deaerator;

[0007] a compressor connected to the pressure container; the compressor is adapted to maintain the pressure in the pressure container;

[0008] the heat storage and release unit is connected to the pipeline between the medium-pressure steam turbine and the high-pressure steam turbine through a second valve;

[0009] the heat storage and release unit has a heat storage state of diverting the reheated steam of the boiler to store heat energy, and a release heat state of delivering the condensate after cooling the diverted reheated steam to the pressure container; and has a release heat state of releasing heat energy to the second heat exchanger to heat the condensate delivered to the second heat exchanger by the pressure container;

[0010] the second heat exchanger is adapted to deliver the heated water to the deaerator.

[0011] Optionally, a fifth valve is provided between the compressor and the pressure container.

[0012] Optionally, a sixth valve is arranged between the pressure vessel and the second heat exchanger.

[0013] Optionally, a first valve is arranged between the low-pressure heater and the deaerator.

[0014] Optionally, the system further comprises:

[0015] A water turbine is arranged between the pressure vessel and the second heat exchanger; the water turbine is adapted to rotate under the pressure of the water delivered by the pressure vessel, and the used water is delivered into the second heat exchanger.

[0016] Optionally, a third pump is arranged between the heat storage and release unit and the pressure vessel.

[0017] Optionally, the heat storage and release unit comprises:

[0018] A heat storage tank, a first heat exchanger and a cold storage tank are connected in sequence; the heat storage tank is connected to the steam inlet end of the second heat exchanger, the cold storage tank is connected to the steam outlet end of the second heat exchanger, and the steam inlet end of the first heat exchanger is connected to the pipeline between the medium-pressure steam turbine and the high-pressure steam turbine through a second valve, and the water outlet end of the first heat exchanger is connected to the pressure vessel.

[0019] Optionally, a fourth valve and a second pump are arranged on the pipeline between the heat storage tank and the steam inlet end of the second heat exchanger, and a third valve and a first pump are arranged on the pipeline between the first heat exchanger and the cold storage tank.

[0020] Optionally, the outlet steam of the high-pressure steam turbine is reheated by the boiler and communicated with the steam inlet of the medium-pressure steam turbine.

[0021] Optionally, the system further comprises:

[0022] A high-pressure heater, the water inlet end of which is connected to the deaerator, and the water outlet end of which is connected to the boiler.

[0023] The steam inlet end of the high-pressure heater is connected to the steam extraction end of the high-pressure steam turbine and the first-stage steam extraction end of the medium-pressure steam turbine, and the steam inlet end of the deaerator is connected to the second-stage steam extraction end of the medium-pressure steam turbine.

[0024] The above technical solutions of the present application have the following advantages compared with the prior art:

[0025] 1. The integrated heat storage and pressure storage power generation system provided by the present application, comprising: a boiler, a high-pressure steam turbine, a medium-pressure steam turbine, a low-pressure steam turbine, a condenser, a low-pressure heater and a deaerator connected in sequence; the steam inlet end of the low-pressure heater is connected to the steam extraction end of the low-pressure steam turbine; a heat storage and heat release unit, a pressure container and a second heat exchanger connected in sequence; the heat storage and heat release unit is connected to the second heat exchanger; the second heat exchanger is connected between the low-pressure heater and the deaerator; a compressor connected to the pressure container; the compressor is adapted to maintain the pressure in the pressure container; the heat storage and heat release unit is connected to the pipeline between the medium-pressure steam turbine and the high-pressure steam turbine through a second valve; the heat storage and heat release unit has a heat storage state of diverting the reheated steam of the boiler to store heat energy, and a heat release state of delivering the condensate after cooling the diverted reheated steam to the pressure container; and the second heat exchanger is adapted to deliver the heated water to the deaerator; the present application uses the above technical solution, introduces external energy storage, breaks the constraints of traditional coal-fired generator set peak shaving and frequency modulation, further improves the peak shaving and frequency modulation capacity of the coal-fired generator set, combines heat storage and pressure storage technology; using compressed air and water pressure storage, short-time rapid frequency modulation can be realized, heat storage can effectively realize deep peak shaving, and the energy storage cost of heat storage and pressure storage is low, the energy storage medium is easy to obtain, and there is basically no impact on the environment. Compared with the traditional coal-fired generator set, the load variation range of the traditional coal-fired generator set is expanded; the minimum load can be reduced from 30% THA to 0% THA, the maximum load can be increased from 100% THA to 115% THA, the variable load rate can be increased from 1-1.5% Pe0 / min to 3.55% Pe0 / min, and the peak shaving and frequency modulation capacity is greatly improved. Specifically, in the energy storage process, compressed air and pressure water are mixed to store pressure, isothermal energy storage can be realized by using a compressor, and the energy storage density is improved by using high-pressure water to absorb the heat of compressed air to reduce the load; and by changing the opening of the second valve, the flow rate of the condensate flowing into the pressure container can be adjusted to control the load reduction rate. In the energy release process, the pressure water is released by compressed air without releasing pressure, the pressure water after energy release is heated by the heat storage and heat release unit and directly enters the deaerator to replace the heating of the condensate water by the low-pressure heater, further reduces the steam extraction of the low-pressure steam turbine, increases the output power, improves the cycle efficiency of energy storage, and improves the load of the coal-fired generator set; coupling heat storage and pressure storage with the traditional coal-fired generator set greatly increases the load operation range of the coal-fired generator set, improves the frequency modulation capacity of the coal-fired generator set, meets the frequent peak shaving and frequency modulation demand of renewable energy, and enhances the safety and stability of the power grid.

[0026] 2. The fifth valve is arranged between the compressor and the pressure container; the air flow entering the pressure container is controlled by adjusting the opening degree of the fifth valve when the load of the coal-fired generator set is reduced, so that the air flow is matched with the drain flow, the isothermal pressure rise of the pressure container is ensured, and the heat storage density is improved; when the load of the coal-fired generator set is increased, the air flow entering the pressure container is controlled by adjusting the opening degree of the fifth valve, so that the pressure in the pressure container is kept constant during the release of the high-pressure water.

[0027] 3. The sixth valve is arranged between the pressure container and the second heat exchanger; the sixth valve is convenient for starting the release of high-pressure water from the pressure container.

[0028] 4. The first valve is arranged between the low-pressure heater and the deaerator; the opening degree of the first valve is adjusted, so that the flow of the condensate water is adjusted, the flow of the condensate water is the same as the flow of the high-pressure water leaving the pressure container, and the water level of the deaerator is ensured to be in a safe range.

[0029] 5. The integrated heat storage and pressure storage power generation system also comprises a water turbine arranged between the pressure container and the second heat exchanger; the water turbine is adapted to rotate under the pressure of the water delivered by the pressure container, and the used water is delivered into the second heat exchanger; the compressed air is used to realize energy release without pressure release, so that the water turbine can keep high-efficiency operation and the energy utilization efficiency is improved.

[0030] 6. The third pump is arranged between the heat storage and release unit and the pressure container; the feed water pressure entering the pressure container is increased by the third pump.

[0031] 7. The heat storage and release unit comprises a heat storage tank, a first heat exchanger and a cold storage tank connected in sequence; the heat storage tank is connected with the steam inlet end of the second heat exchanger, the cold storage tank is connected with the steam outlet end of the second heat exchanger, the steam inlet end of the first heat exchanger is connected to the pipeline between the medium-pressure steam turbine and the high-pressure steam turbine through the second valve, and the water outlet end of the first heat exchanger is connected with the pressure container; the steam amount entering the medium-pressure steam turbine is reduced by arranging the cold storage tank, the steam energy is stored by arranging the heat storage tank, the water entering the deaerator is heated, the heating of the condensate water by the low-pressure heater is replaced, the steam extraction of the low-pressure steam turbine is further reduced, the output power is increased, the cycle efficiency of energy storage is improved, and the load of the coal-fired generator set is increased.

[0032] 8. The application is provided with a fourth valve and a second pump between the heat storage tank and the steam inlet end of the second heat exchanger; a third valve and a first pump are arranged on the pipeline between the first heat exchanger and the cold storage tank; the application adopts the above technical scheme, the fourth valve is used to conveniently control the opening of the energy release of the heat storage tank; the third valve is used to conveniently control the opening of the energy absorption of the cold storage tank; and the first pump and the second pump are used to accelerate the energy transmission cycle.

[0033] 9. The outlet steam of the high-pressure steam turbine is reheated by the boiler and communicated with the steam inlet of the medium-pressure steam turbine; the application adopts the above technical scheme, the steam at the steam outlet of the high-pressure steam turbine is reheated by the boiler and then introduced into the steam inlet of the medium-pressure steam turbine, so that the steam temperature of the medium-pressure steam turbine is increased and the work capacity of the medium-pressure steam turbine is improved.

[0034] 10. The integrated heat storage and pressure storage power generation system provided by the application further comprises a high-pressure heater, the water inlet end of which is connected with a deaerator, and the water outlet end of the high-pressure heater is connected with a boiler; the steam inlet end of the high-pressure heater is connected with the steam extraction end of a high-pressure steam turbine and the first-stage steam extraction end of a medium-pressure steam turbine; the steam inlet end of the deaerator is connected with the second-stage steam extraction end of the medium-pressure steam turbine; the application adopts the above technical scheme, the steam extraction of the high-pressure steam turbine and the medium-pressure steam turbine is fully utilized to heat the backwater and recycle the backwater to the boiler; energy and water source are saved. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0036] Figure 1 The connection structure schematic diagram of the integrated heat storage and pressure storage power generation system provided in the embodiments of the present application;

[0037] Figure 2 The load variation interval comparison schematic diagram of the integrated heat storage and pressure storage power generation system provided in the embodiments of the present application and the traditional coal-fired generator set;

[0038] Figure 3 The variable load rate comparison schematic diagram of the integrated heat storage and pressure storage power generation system provided in the embodiments of the present application and the traditional coal-fired generator set.

[0039] Explanation of reference signs:

[0040] 1 boiler; 2 high pressure steam turbine; 3 medium pressure steam turbine; 4 low pressure steam turbine; 5 condenser; 6 low pressure heater; 7 first valve; 8 deaerator; 9 high pressure heater; 10 second valve; 11 cold storage tank; 12 third valve; 13 first pump; 14 first heat exchanger; 15 hot storage tank; 16 fourth valve; 17 second pump; 18 third pump; 19 pressure vessel; 20 compressor; 21 fifth valve; 22 sixth valve; 23 hydraulic turbine; 24 second heat exchanger. DETAILED DESCRIPTION

[0041] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] As Figures 1 to 3A specific embodiment of the integrated thermal and pressure storage power generation system shown includes: a boiler 1, a high-pressure steam turbine 2, a medium-pressure steam turbine 3, a low-pressure steam turbine 4, a condenser 5, a low-pressure heater 6, a first valve 7, a deaerator 8, and a high-pressure heater 9 connected in sequence; a thermal storage and release unit, a third pump 18, a pressure vessel 19, a sixth valve 22, a water turbine 23, and a second heat exchanger 24 connected in sequence; and a compressor 20 connected to the pressure vessel 19. Specifically, the boiler 1 is a coal-fired boiler; the first valve 7 and the sixth valve 22 are both regulating valves; the third pump 18 is a water pump; and the pressure vessel 19 is a pressure tank, which is a pressure-bearing tank capable of storing compressed air and water as working fluid, with a pressure-bearing capacity of not less than 80 bar.

[0046] like Figure 1 As shown, the steam inlet of the low-pressure heater 6 is connected to the extraction end of the low-pressure turbine 4; the heat storage and release unit is connected to the heat storage medium inlet of the second heat exchanger 24; the water outlet of the second heat exchanger 24 is connected between the low-pressure heater 6 and the deaerator 8; the compressor 20 is adapted to maintain the pressure inside the pressure vessel 19; the heat storage and release unit is connected to the pipeline between the medium-pressure turbine 3 and the high-pressure turbine 2 through the second valve 10; the heat storage and release unit has a heat storage state that diverts the reheat steam from the boiler 1 to store heat energy, and pumps the cooled condensate from the diverted reheat steam to the pressure vessel 19; and a heat release state that releases heat energy to the second heat exchanger 24, heating the condensate in the pressure vessel 19 and sending it to the second heat exchanger 24 via the water turbine 23; the second heat exchanger 24 is adapted to pump the heated water to the deaerator 8. Specifically, the temperature of the reheat steam is greater than 500°C and the pressure is greater than 20 bar. The water supply pressure entering the pressure tank via a water pump is no less than 50 bar, and the water can enter the pressure tank by spraying using a spray generator or directly through a pipeline connection. A fifth valve 21 is provided between the compressor 20 and the pressure vessel 19; specifically, the fifth valve 21 is a regulating valve. The water turbine 23 is adapted to rotate under the pressure of the water supplied by the pressure vessel 19, and the used water is then transported to the second heat exchanger 24. Furthermore, the water turbine 23 is connected to a generator connected to the power grid.

[0047] The heat storage and release unit includes: a heat storage tank 15, a first heat exchanger 14, a first pump 13, a third valve 12, and a cold storage tank 11 connected in sequence, as well as a fourth valve 16 and a second pump 17 connected to the heat storage tank 15. Specifically, the third valve 12 and the fourth valve 16 are both regulating valves. Both the heat storage tank 15 and the cold storage tank 11 store a heat storage medium, such as molten salt or heat transfer oil. The temperature of the heat storage medium entering the heat storage tank 15 is not lower than 300°C. The first heat exchanger 14 is a heat exchanger between the heat storage medium and steam.

[0048] The heat storage tank 15 is connected with the heat storage medium inlet end of the second heat exchanger 24, and the cold storage tank 11 is connected with the heat storage medium outlet end of the second heat exchanger 24; the steam inlet end of the first heat exchanger 14 is connected to the pipeline between the medium-pressure steam turbine 3 and the high-pressure steam turbine 2 through the second valve 10, and specifically, the second valve 10 is a reheat steam shunt valve. The water outlet end of the first heat exchanger 14 is connected with the pressure container 19 through a water pump.

[0049] The outlet steam of the high-pressure steam turbine 2 is reheated by the boiler 1 and communicated with the steam inlet of the medium-pressure steam turbine 3. The water inlet end of the high-pressure heater 9 is connected with the deaerator 8, and the water outlet end of the high-pressure heater 9 is connected with the boiler 1; the steam inlet end of the high-pressure heater 9 is connected with the steam extraction end of the high-pressure steam turbine 2 and the first-stage steam extraction end of the medium-pressure steam turbine 3; and the steam inlet end of the deaerator 8 is connected with the second-stage steam extraction end of the medium-pressure steam turbine 3.

[0050] The working process of the integrated heat storage and pressure storage power generation system in load reduction operation is briefly described as follows:

[0051] When it is required to reduce the load operation, the fifth valve 21 is opened, the compressor 20 is started, the compressed air enters the pressure tank, the reheat steam shunt valve and the third valve 12 are opened, and the first pump 13 is started, so that the heat storage medium in the cold storage tank 11 flows into the first heat exchanger 14 to absorb the heat of the reheat steam; the heated heat storage medium flows into the heat storage tank 15; the reheat steam is cooled to become condensate, and after being pressurized by a water pump, the condensate enters the pressure tank. When the pressure in the pressure tank reaches the requirement, the reheat steam shunt valve, the water pump, the compressor 20, the fifth valve 21, the third valve 12 and the first pump 13 are closed; the opening degree of the reheat steam shunt valve is changed to adjust the flow rate of the condensate flowing into the pressure tank, so as to control the load reduction rate; the opening degree of the fifth valve 21 is adjusted to control the air flow entering the pressure tank, so as to match the air flow and the condensate flow, to ensure the isothermal pressure increase of the pressure tank and improve the heat storage density.

[0052] When the load needs to be increased, the sixth valve 22 is opened, the high pressure water is released from the pressure tank and flows into the hydraulic turbine 23 to do work; the fifth valve 21 is opened, the compressor 20 is started, the compressed air enters the pressure tank, and the air flow into the pressure tank is controlled by adjusting the opening of the fifth valve 21, so that the pressure in the pressure tank remains constant during the release of high pressure water. The fourth valve 16 is opened, the second pump 17 is started, and the heat storage medium flows into the second heat exchanger 24 to heat the high pressure water leaving the hydraulic turbine 23. The heated water enters the deaerator 8, and the heat storage medium after heat release returns to the cold storage tank 11. The first valve 7 is opened, the condensate is throttled, the extraction steam of the low pressure steam turbine 4 is reduced, and the work is increased; the throttling amount of the condensate is adjusted by adjusting the opening of the first valve 7, so that the throttling amount of the condensate is the same as the flow of the high pressure water leaving the pressure tank, and the water level of the deaerator 8 is ensured to be within a safe range.

[0053] As shown in Figure 2 , taking a 660 MW ultra-supercritical coal-fired generating unit as an example, after using the integrated heat storage and pressure storage power generation system described in the present application, the minimum load of the coal-fired generating unit in the load variation range is reduced from 198 MW to 0 MW; the maximum load is increased from 660 MW to 759 MW.

[0054] As shown in Figure 3 , taking a 660 MW ultra-supercritical coal-fired generating unit as an example, after using the integrated heat storage and pressure storage power generation system described in the present application, the load variation rate of the coal-fired generating unit is increased from the original 1.5% rated load per minute to 3.55% rated load per minute. Among them, the load variation rate is defined as the change amount of unit time output power of the unit, which can be expressed as the percentage of rated load. Assuming that the rated load is Pe0, in Figure 3 , the ordinate unit is %Pe0 / min, i.e. % rated load per minute.

[0055] Therefore, after using the integrated heat storage and pressure storage power generation system described in the present application, the peak shaving capacity and frequency modulation capacity of the coal-fired generating unit are greatly improved.

[0056] Obviously, the above embodiments are only examples for clear illustration, and are not limitations on the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, all the embodiments cannot be exhausted, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A power generation system integrating thermal and pressure storage, characterized in that, include: A boiler (1), a high-pressure steam turbine (2), a medium-pressure steam turbine (3), a low-pressure steam turbine (4), a condenser (5), a low-pressure heater (6), and a deaerator (8) are connected in sequence; the steam inlet of the low-pressure heater (6) is connected to the steam extraction end of the low-pressure steam turbine (4); A heat storage and heat release unit, a pressure vessel (19), and a second heat exchanger (24) are connected in sequence; the heat storage and heat release unit is connected to the second heat exchanger (24); the second heat exchanger (24) is connected between the low-pressure heater (6) and the deaerator (8); A compressor (20) is connected to a pressure vessel (19); the compressor (20) is adapted to maintain the pressure inside the pressure vessel (19); The heat storage and heat release unit is connected to the pipeline between the medium-pressure steam turbine (3) and the high-pressure steam turbine (2) through the second valve (10); The heat storage and heat release unit has a heat storage state that splits the reheat steam of the boiler (1) to store heat energy and transports the condensate after cooling the split reheat steam to the pressure vessel (19); and a heat release state that releases heat energy to the second heat exchanger (24) and heats the condensate in the pressure vessel (19) to the second heat exchanger (24). The second heat exchanger (24) is adapted to deliver heated water to the deaerator (8); A fifth valve (21) is provided between the compressor (20) and the pressure vessel (19); A first valve (7) is provided between the low-pressure heater (6) and the deaerator (8); Also includes: A water turbine (23) is installed between a pressure vessel (19) and a second heat exchanger (24); the water turbine (23) is adapted to rotate under the pressure of water transported in the pressure vessel (19), and the used water is then transported to the second heat exchanger (24); The pressure vessel (19) is a pressure tank; the second valve (10) is a reheat steam diversion valve; The rate of condensate flow into the pressure tank is controlled by adjusting the opening of the reheat steam diversion valve. By adjusting the opening of the fifth valve (21), the air flow rate entering the pressure tank is controlled so that the air flow rate matches the condensate flow rate, ensuring that the pressure tank is pressurized at an isothermal temperature and increasing the heat storage density. Adjusting the opening of the first valve (7) adjusts the condensate flow rate so that the condensate flow rate is the same as the flow rate of the high-pressure water leaving the pressure tank, ensuring that the water level of the deaerator (8) is within a safe range.

2. The integrated thermal and pressure storage power generation system according to claim 1, characterized in that, A sixth valve (22) is provided between the pressure vessel (19) and the second heat exchanger (24).

3. The integrated thermal and pressure storage power generation system according to claim 1, characterized in that, A third pump (18) is provided between the heat storage and heat release unit and the pressure vessel (19).

4. The integrated thermal and pressure storage power generation system according to any one of claims 1-3, characterized in that, The heat storage and heat release unit includes: A heat storage tank (15), a first heat exchanger (14), and a cold storage tank (11) are connected in sequence; the heat storage tank (15) is connected to the steam inlet of the second heat exchanger (24), and the cold storage tank (11) is connected to the steam outlet of the second heat exchanger (24); the steam inlet of the first heat exchanger (14) is connected to the pipeline between the medium-pressure turbine (3) and the high-pressure turbine (2) through the second valve (10), and the water outlet of the first heat exchanger (14) is connected to the pressure vessel (19).

5. The integrated thermal and pressure storage power generation system according to claim 4, characterized in that, A fourth valve (16) and a second pump (17) are provided on the pipeline between the heat storage tank (15) and the steam inlet end of the second heat exchanger (24); a third valve (12) and a first pump (13) are provided on the pipeline between the first heat exchanger (14) and the cold storage tank (11).

6. The integrated thermal and pressure storage power generation system according to any one of claims 1-3, characterized in that, The outlet steam of the high-pressure steam turbine (2) is reheated by the boiler (1) and then connected to the steam inlet of the medium-pressure steam turbine (3).

7. The integrated thermal and pressure storage power generation system according to any one of claims 1-3, characterized in that, Also includes: The high-pressure heater (9) is connected to the deaerator (8) at its inlet end and to the boiler (1) at its outlet end. The steam inlet of the high-pressure heater (9) is connected to the steam extraction end of the high-pressure turbine (2) and the first-stage steam extraction end of the intermediate-pressure turbine (3); the steam inlet of the deaerator (8) is connected to the second-stage steam extraction end of the intermediate-pressure turbine (3).

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