Fused salt heat storage and biomass energy storage coupled gas-steam combined cycle power generation system

Abstract

The invention discloses a fuel gas and steam combined cycle power generation system coupling fused salt heat storage and biomass energy storage, which comprises a fuel gas and steam combined cycle power generation subsystem, a fused salt heat storage and release subsystem and a biomass energy storage system, an outlet of the gas-steam combined cycle power generation subsystem is connected with the fused salt heat storage and release subsystem and the biomass energy storage system, and a smoke outlet of the biomass energy storage system is connected with the gas-steam combined cycle power generation subsystem. And the utilization efficiency of energy and the economical efficiency of the system are improved.

Description

Technical Field

[0001] This invention belongs to the field of power generation technology and relates to a gas-steam combined cycle power generation system that couples molten salt thermal storage and biomass energy storage. Background Technology

[0002] Combined cycle power plants (CCPPs) have shown broad application prospects in power and heating sectors due to their high efficiency, environmental friendliness, and rapid start-up capabilities. With the advancement of my country's "coal-to-gas" policy, the installed capacity of CCPPs has continued to increase. However, due to the constraints of my country's energy structure, the dependence on natural gas imports remains significant. In recent years, while my country's installed CCPP capacity has been continuously increasing, it faces the problem of uneven electricity load. During peak electricity consumption periods, CCPPs operate at full load; while during off-peak periods, they need to operate at reduced load, leading to a significant increase in heat consumption rate and plant power consumption rate, increasing power generation costs and reducing economic benefits. Taking the 9FA single-shaft combined cycle unit as an example, when the unit load rate drops to 80%, 60%, and 40%, the heat consumption rate increases by 4%, 8%, and 20%, respectively. Therefore, optimizing CCPP operation and improving system flexibility are crucial for improving energy utilization efficiency and alleviating energy pressure.

[0003] Energy storage technology, as a key technology supporting the transformation of future energy structure and changes in electricity production and consumption patterns, can effectively address the intermittency and random fluctuations in power generation, enhance the peak-shaving capacity of the power system, ensure the stable operation of the power grid, and meet the demands of economic and social development for high-quality, safe, and reliable power supply. Among these technologies, molten salt, with its advantages of good thermal stability, high heat storage density, long service life, low viscosity, and low cost, has become a highly efficient heat transfer and storage medium, and is widely used in the decoupling and flexibility retrofitting of generator sets. Furthermore, waste biomass resources, as renewable resources, are widely available and environmentally friendly, showing great potential in the field of chemical energy storage. Their energy storage utilization not only helps alleviate environmental pressure but also meets the current requirements of environmental protection, energy conservation, and sustainable development.

[0004] Based on the above, there is an urgent need for a system that can effectively solve the problem of energy efficiency decline in gas-fired steam combined cycle units during load fluctuations, and improve energy utilization efficiency and system economy. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gas-fired steam combined cycle power generation system that couples molten salt thermal storage and biomass energy storage. This system can effectively solve the problem of energy efficiency decline caused by load fluctuations in gas-fired steam combined cycle units, and improve energy utilization efficiency and system economy.

[0006] To achieve the above objectives, the present invention discloses a gas-steam combined cycle power generation system that couples molten salt thermal storage and biomass energy storage, comprising a gas-steam combined cycle power generation system, a molten salt thermal storage and release subsystem, and a biomass energy storage system. The outlet of the gas-steam combined cycle power generation system is connected to the molten salt thermal storage and release subsystem and the biomass energy storage system, and the flue gas outlet of the biomass energy storage system is connected to the gas-steam combined cycle power generation system.

[0007] A further improvement of the gas-steam combined cycle power generation system coupled with molten salt thermal storage and biomass energy storage described in this invention is as follows: Furthermore, the gas-steam combined cycle power generation system includes a compressor, a mixed fuel combustion chamber, a gas turbine, a generator, a steam turbine, a condenser, a water pump, and a waste heat boiler; the biomass energy storage system includes a biomass pyrolysis furnace, a separator, a biomass steam gasification furnace, a syngas purification and drying device, a syngas storage tank, a biochar storage silo, and a combustion furnace. The compressor outlet is connected to the inlet of the combustion furnace and the inlet of the mixed fuel combustion chamber. The outlet of the mixed fuel combustion chamber is connected to the inlet of the gas turbine. The outlet of the gas turbine is connected to the flue gas inlet of the waste heat boiler. The outlet of the gas turbine is connected to the inlet of the biomass pyrolysis furnace and the inlet of the biomass steam gasification furnace. The outlet of the biomass steam gasification furnace is connected to the inlet of the syngas storage tank via a syngas purification and drying device. The outlet of the syngas storage tank is connected to the inlet of the mixed fuel combustion chamber. The outlet of the biomass pyrolysis furnace is connected to the inlet of the separator. The biomass carbon outlet of the separator is connected to the inlet of the biomass carbon storage tank, the outlet of the biomass carbon storage tank is connected to the inlet of the combustion furnace, the biomass gas outlet of the separator is connected to the inlet of the biomass steam gasification furnace, the steam outlet of the waste heat boiler is connected to the inlet of the steam turbine, the outlet of the steam turbine is connected to the inlet of the biomass steam gasification furnace, and the outlet of the steam turbine is divided into two paths after passing through the condenser and water pump. One path is connected to the water inlet of the waste heat boiler, and the other path is connected to the water inlet of the molten salt boiler. The steam outlet of the molten salt boiler is connected to the inlet of the steam turbine.

[0008] Furthermore, the outlet of the gas turbine is connected to the inlet of the biomass pyrolysis furnace and the inlet of the biomass steam gasification furnace via the first valve.

[0009] Furthermore, the turbine outlet is connected to the inlet of the biomass steam gasification furnace via a second valve.

[0010] Furthermore, the turbine outlet is connected to the molten salt boiler inlet via a condenser, water pump, and a third valve.

[0011] Furthermore, the compressor, gas turbine, generator, and steam turbine are arranged coaxially.

[0012] Furthermore, the molten salt heat storage and release subsystem includes a molten salt flue gas heat exchanger, a low-temperature molten salt tank, a high-temperature molten salt tank, and a molten salt boiler; The molten salt outlet of the waste heat boiler is connected to the inlet of the high-temperature molten salt tank via the tube side of the molten salt flue gas heat exchanger. The outlet of the high-temperature molten salt tank is connected to the molten salt inlet of the molten salt boiler. The molten salt outlet of the molten salt boiler is connected to the inlet of the low-temperature molten salt tank. The outlet of the low-temperature molten salt tank is connected to the molten salt inlet of the waste heat boiler.

[0013] Furthermore, the flue gas outlet of the combustion furnace is connected to the flue gas inlet of the waste heat boiler via the shell side of the molten salt flue gas heat exchanger.

[0014] Furthermore, the flue gas outlet of the biomass pyrolysis furnace is connected to the flue gas inlet of the waste heat boiler.

[0015] Furthermore, it also includes a biomass input pipeline, which is connected to the inlet of the biomass pyrolysis furnace and the inlet of the biomass steam gasification furnace.

[0016] The present invention has the following beneficial effects: The gas-fired steam combined cycle power generation system of this invention, which couples molten salt thermal storage and biomass energy storage, enables the system to flexibly adjust its power generation and energy storage capacity according to changes in grid load. This ensures the stability of power supply, significantly improves energy utilization efficiency and system flexibility, and achieves a significant increase in economic benefits. By efficiently utilizing waste biomass resources, it reduces environmental pressure and meets the requirements of energy conservation, emission reduction, and environmental protection while ensuring sustainable development. It also solves the problem of energy efficiency decline caused by load fluctuations in gas-fired steam combined cycle units, thereby improving energy utilization efficiency and system economy. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a structural diagram of the present invention.

[0018] Among them, 1 is a compressor; 2 is a mixed fuel combustion chamber; 3 is a gas turbine; 4 is a generator; 5 is a steam turbine; 6 is a condenser; 7 is a water pump; 8 is a waste heat boiler; 9 is a molten salt flue gas heat exchanger; 10 is a low-temperature molten salt tank; 11 is a high-temperature molten salt tank; 12 is a molten salt boiler; 13 is a biomass pyrolysis furnace; 14 is a separator; 15 is a biomass steam gasification furnace; 16 is a syngas purification and drying device; 17 is a syngas storage tank; 18 is a biomass char storage tank; and 19 is a combustion furnace. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0023] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0024] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] refer to Figure 1 The combined cycle power generation system of gas and steam coupled with molten salt thermal storage and biomass energy storage of the present invention includes a compressor 1, a mixed fuel combustion chamber 2, a gas turbine 3, a generator 4, a steam turbine 5, a condenser 6, a water pump 7, a waste heat boiler 8, a molten salt flue gas heat exchanger 9, a low-temperature molten salt tank 10, a high-temperature molten salt tank 11, a molten salt boiler 12, a biomass pyrolysis furnace 13, a separator 14, a biomass steam gasification furnace, a syngas purification and drying device 16, a syngas storage tank 17, a biomass char storage tank 18, and a combustion furnace 19. The outlet of compressor 1 is connected to the inlet of combustion furnace 19 and the inlet of mixed fuel combustion chamber 2. The outlet of mixed fuel combustion chamber 2 is connected to the inlet of gas turbine 3. The outlet of gas turbine 3 is connected to the flue gas inlet of waste heat boiler 8. The outlet of gas turbine 3 is connected to the inlet of biomass pyrolysis furnace 13 and the inlet of biomass steam gasification furnace 15 via a first valve. The outlet of biomass steam gasification furnace 15 is connected to the inlet of syngas storage tank 17 via syngas purification and drying device 16. The outlet of syngas storage tank 17 is connected to the inlet of mixed fuel combustion chamber 2. The outlet of biomass pyrolysis furnace 13 is connected to the inlet of separator 14. The biomass carbon outlet of separator 14 is connected to the inlet of biomass char storage tank 18. The outlet of biomass char storage tank 18 is connected to the inlet of combustion furnace 19. The biomass carbon outlet of separator 14 is connected to the inlet of biomass char storage tank 18. The outlet of biomass char storage tank 18 is connected to the inlet of combustion furnace 19. The gas outlet of the material is connected to the inlet of the biomass steam gasifier 15. The steam outlet of the waste heat boiler 8 is connected to the inlet of the steam turbine 5. The outlet of the steam turbine 5 is connected to the inlet of the biomass steam gasifier 15 via a second valve. The outlet of the steam turbine 5 is divided into two paths after passing through the condenser 6 and the water pump 7. One path is connected to the water inlet of the waste heat boiler 8, and the other path is connected to the water inlet of the molten salt boiler 12 via a third valve. The steam outlet of the molten salt boiler 12 is connected to the inlet of the steam turbine 5. The molten salt outlet of the waste heat boiler 8 is connected to the inlet of the high-temperature molten salt tank 11 via the tube side of the molten salt flue gas heat exchanger 9. The outlet of the high-temperature molten salt tank 11 is connected to the molten salt inlet of the molten salt boiler 12. The molten salt outlet of the molten salt boiler 12 is connected to the inlet of the low-temperature molten salt tank 10. The outlet of the low-temperature molten salt tank 10 is connected to the molten salt inlet of the waste heat boiler 8.

[0028] The flue gas outlet of the combustion furnace 19 is connected to the flue gas inlet of the waste heat boiler 8 via the shell side of the molten salt flue gas heat exchanger 9, and the flue gas outlet of the biomass pyrolysis furnace 13 is connected to the flue gas inlet of the waste heat boiler 8.

[0029] The compressor 1, gas turbine 3, generator 4 and steam turbine 5 are arranged coaxially.

[0030] The gas-steam combined cycle power generation system includes a compressor 1, a mixed fuel combustion chamber 2, a gas turbine 3, a generator 4, a steam turbine 5, a condenser 6, a water pump 7, and a waste heat boiler 8. Based on the Brayton thermodynamic cycle, the compressor 1 draws in air from the atmosphere, compresses it, and sends it to the mixed fuel combustion chamber 2 to mix with fuel for combustion. During combustion, the chemical energy of the fuel is converted into the thermodynamic energy of the high-temperature gas. The discharged high-temperature gas flows into the gas turbine 3 to do work, driving the rotor to rotate at high speed and powering the generator 4 to generate electricity. After undergoing heat-work conversion in the gas turbine 3, the gas is discharged with a relatively high temperature. The gas is introduced into the waste heat boiler 8 to heat water to form superheated steam. The steam enters the steam turbine 5 to do work, driving the rotor to rotate and powering the generator 4 to generate electricity. After being discharged from the steam turbine 5, the steam enters the condenser 6 to condense, and then passes through the water pump 7 back into the waste heat boiler 8 for heating, forming a power generation cycle.

[0031] The molten salt heat storage and release subsystem includes a molten salt flue gas heat exchanger 9, a low-temperature molten salt tank 10, a high-temperature molten salt tank 11, and a molten salt boiler 12. In heat storage mode, the low-temperature molten salt in the low-temperature molten salt tank 10 enters the waste heat boiler 8 to absorb heat from the gas turbine exhaust, and after being heated to a set temperature, it is sent to the high-temperature molten salt tank 11 for storage. When the system switches to heat release mode, part of the feedwater is sent to the molten salt boiler 12, where the high-temperature molten salt from the high-temperature molten salt tank 11 heats the feedwater to form superheated steam, which then enters the steam turbine 5 to perform work. The high-temperature molten salt in the molten salt boiler 12 gradually cools down and finally enters the low-temperature molten salt tank 10 for storage.

[0032] The biomass energy storage system includes a biomass pyrolysis furnace 13, a separator 14, a biomass steam gasification furnace 15, a syngas purification and drying device 16, a syngas storage tank 17, a biomass char storage tank 18, and a combustion furnace 19. Biomass is pyrolyzed at high temperature in the biomass pyrolysis furnace 13 to generate biomass gas and biomass char. The two are separated in the separator 14. The biomass char separated by the separator 14 is stored in the biomass char storage tank 18. The separated biomass gas is sent to the biomass steam gasification furnace 15, where steam extracted from the steam turbine 5 is used to gasify the biomass fuel at high temperature to generate syngas. The syngas is then sent to the syngas storage tank 17 for storage after passing through the syngas purification and drying device 16.

[0033] In this embodiment, the mixed fuel combustion chamber 2 can use either natural gas directly or mixed fuel; the syngas in the syngas storage tank 17 is mixed with natural gas and then sent to the mixed fuel combustion chamber 2 for combustion.

[0034] In this embodiment, the flue gas from the gas turbine 3 is introduced into the biomass pyrolysis furnace 13 and the biomass steam gasification furnace 15 to provide a high-temperature environment and heat for the pyrolysis and gasification reactions. The flue gas from the biomass pyrolysis furnace 13 and the biomass steam gasification furnace 15 is further introduced into the waste heat boiler 8 to heat the feedwater and low-temperature molten salt.

[0035] In this embodiment, the biomass char in the biomass char storage 18 is fed into the combustion furnace 19 for combustion. At the same time, some compressed air is drawn from the compressor 1 and sent into the combustion furnace 19 to provide the oxygen required for combustion. The flue gas generated by combustion enters the molten salt flue gas heat exchanger 9 to further heat the molten salt and increase the temperature of the molten salt. Then, it enters the waste heat boiler 8 to heat the feedwater and low-temperature molten salt.

[0036] The working process of this invention is as follows: When the grid load is very low, requiring deep peak shaving operation of the generating units, the gas-fired steam combined cycle power generation system still operates at a high load. A portion of the flue gas exhaust is successively fed into the biomass pyrolysis furnace 13 and the biomass steam gasification furnace 15. Biomass is used to generate biomass syngas and biochar through pyrolysis and gasification reactions, and the two are stored in the syngas storage tank 17 and the biochar storage tank 18, respectively. The molten salt heat storage and release system enters the heat storage mode, and the low-temperature molten salt in the low-temperature molten salt tank 10 is sent to the waste heat boiler 8 to exchange heat with the high-temperature flue gas. After the molten salt absorbs heat and reaches the predetermined temperature, it is sent to the high-temperature molten salt tank 11 for storage. Simultaneously operating in the biomass energy storage subsystem, the combustion furnace 19 contains biomass char stored in the biomass char storage tank 18. The biomass char is fed into the combustion furnace 19 for combustion. A portion of compressed air is drawn from the compressor 1 and fed into the combustion furnace 19 to provide the oxygen required for combustion. The resulting high-temperature flue gas enters the molten salt flue gas heat exchanger 9 to further heat the molten salt and increase its temperature. Afterward, it enters the waste heat boiler 8 to continue heating the low-temperature molten salt and feedwater.

[0037] When the power grid load is low and the unit is required to operate at peak load, the gas-steam combined cycle power generation system can still maintain a high load or even full load operation. The molten salt heat storage and release subsystem enters the heat storage mode, and at the same time, the biomass energy storage subsystem also starts to operate, using biomass to generate biomass syngas and biochar through cracking and gasification reactions and storing them.

[0038] When the power grid load is moderate and the unit is required to reduce its load, the gas-steam combined cycle power generation system can still maintain full-load operation. The molten salt thermal storage and release subsystem and the biomass energy storage subsystem can be selected to operate: if the molten salt thermal storage and release subsystem is operated, the thermal storage mode is switched; if the biomass energy storage subsystem is operated, biomass is used to generate biomass syngas and biochar through cracking and gasification reactions and then stored.

[0039] When the power grid load is high, the power generation system is required to operate at full capacity. The combined cycle gas-fired power generation system operates at full capacity, while the biomass energy storage subsystem stops operating. Syngas from the syngas storage tank 17 is mixed with natural gas and sent to the mixed fuel combustion chamber 2 for combustion. Simultaneously, the combustion furnace 19 is operated, using biomass char from the biomass char storage tank 18 for combustion. The resulting high-temperature flue gas enters the waste heat boiler 8 to heat the feedwater. At the same time, the molten salt heat storage and release subsystem enters the heat release mode, sending part of the feedwater to the molten salt boiler 12. The high-temperature molten salt from the high-temperature molten salt tank 11 heats the feedwater to form superheated steam, which then enters the turbine 5 to perform work. The high-temperature molten salt in the molten salt boiler 12 gradually cools down and finally enters the low-temperature molten salt tank 10 for storage. Under this operating mode, the system has no energy storage.

[0040] When the gas-steam combined cycle power generation system needs to be shut down for maintenance, but the power grid still has a load gap, the molten salt thermal energy storage subsystem enters the heat release mode, and the biomass energy storage subsystem stops operating.

[0041] This invention has the following characteristics: This invention, by coupling molten salt thermal energy storage and biomass energy storage technologies, can flexibly adjust power generation and energy storage capacity according to changes in grid load, thereby achieving effective peak shaving for grid load fluctuations and enhancing the regulation capability and flexibility of the power system. When grid load is low or during deep peak shaving, this invention can store energy using molten salt thermal energy storage and biomass energy storage subsystems, allowing the generating units to operate at higher loads while stabilizing power supply. This avoids the instability caused by grid load fluctuations, ensuring the stability and security of power supply, and preparing for future peak load demands.

[0042] This invention can select appropriate operating modes according to different operational needs, optimize energy configuration, and make energy utilization more efficient and economical, while also adapting to the changing demands of the power grid. By coupling molten salt thermal storage and biomass energy storage, it can maintain high load operation during peak electricity demand periods and regulate through the energy storage system during off-peak periods, avoiding increased heat loss rate and plant power consumption rate due to uneven load distribution, effectively reducing power generation costs and improving economic efficiency.

[0043] The molten salt heat storage and release subsystem can effectively recover the heat from the combustion flue gas of the gas turbine and biochar to heat the molten salt, effectively recovering waste heat and converting it into usable energy; the biomass energy storage subsystem utilizes waste biomass resources to generate valuable syngas and biochar through cracking and gasification reactions. The combined use of the two subsystems significantly improves the comprehensive energy utilization efficiency, reduces energy waste, and enhances the overall system efficiency.

[0044] This invention utilizes waste biomass resources for energy conversion and storage, reducing dependence on traditional fossil fuels such as natural gas, alleviating environmental pressure, reducing carbon emissions, and improving system sustainability, thus meeting the requirements of energy conservation, emission reduction, environmental protection, and sustainable development.

[0045] When a gas-fired steam combined cycle unit needs to be shut down for maintenance, the molten salt thermal storage subsystem can continue to provide power to the grid through a heat release mode, ensuring the stable operation of the grid and ensuring the system can flexibly respond to events such as shutdowns for maintenance.

[0046] Through these technical effects, the present invention effectively solves the problem of energy efficiency decline in gas-fired steam combined cycle units under load fluctuations, improves energy utilization efficiency and system economy, and has high application value and environmental benefits.

[0047] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0048] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0049] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A gas-steam combined cycle power generation system coupled with molten salt thermal storage and biomass energy storage, characterized in that, The system comprises a gas-steam combined cycle power generation system, a molten salt heat storage and release subsystem and a biomass energy storage system, wherein the outlet of the gas-steam combined cycle power generation system is connected with the molten salt heat storage and release subsystem and the biomass energy storage system, and the flue gas outlet of the biomass energy storage system is connected with the gas-steam combined cycle power generation system.

2. The gas-steam combined cycle power generation system coupling molten salt thermal storage and biomass energy storage according to claim 1, characterized in that, The gas-steam combined cycle power generation system comprises a compressor (1), a mixed fuel combustion chamber (2), a gas turbine (3), a generator (4), a steam turbine (5), a condenser (6), a water pump (7) and a waste heat boiler (8); the biomass energy storage system comprises a biomass pyrolysis furnace (13), a separator (14), a biomass steam gasification furnace (15), a syngas purification and drying device (16), a syngas storage tank (17), a biomass charcoal storage (18) and a combustion furnace (19). The outlet of the compressor (1) is connected with the inlet of the combustion furnace (19) and the inlet of the mixed fuel combustion chamber (2); the outlet of the mixed fuel combustion chamber (2) is connected with the inlet of the gas turbine (3); the outlet of the gas turbine (3) is connected with the flue gas inlet of the waste heat boiler (8); the outlet of the gas turbine (3) is connected with the inlet of the biomass pyrolysis furnace (13) and the inlet of the biomass steam gasification furnace (15); the outlet of the biomass steam gasification furnace (15) is connected with the inlet of the syngas storage tank (17) through the syngas purification and drying device (16); the outlet of the syngas storage tank (17) is connected with the inlet of the mixed fuel combustion chamber (2); the outlet of the biomass pyrolysis furnace (13) is connected with the inlet of the separator (14); the biomass charcoal outlet of the separator (14) is connected with the inlet of the biomass charcoal storage (18); the outlet of the biomass charcoal storage (18) is connected with the inlet of the combustion furnace (19); the biomass gas outlet of the separator (14) is connected with the inlet of the biomass steam gasification furnace (15); the steam outlet of the waste heat boiler (8) is connected with the inlet of the steam turbine (5); the outlet of the steam turbine (5) is connected with the inlet of the biomass steam gasification furnace (15); the outlet of the steam turbine (5) is divided into two paths after passing through the condenser (6) and the water pump (7), one of which is connected with the water inlet of the waste heat boiler (8), and the other is connected with the water inlet of the molten salt boiler (12); the steam outlet of the molten salt boiler (12) is connected with the inlet of the steam turbine (5).

3. The gas-steam combined cycle power generation system coupling molten salt thermal storage and biomass energy storage according to claim 2, characterized in that, The outlet of the gas turbine (3) is connected with the inlet of the biomass pyrolysis furnace (13) and the inlet of the biomass steam gasification furnace (15) through the first valve.

4. The system of claim 2, wherein the molten salt thermal storage is coupled to the gas-steam combined cycle power generation system by a heat exchanger. The outlet of the steam turbine (5) is connected with the inlet of the biomass steam gasification furnace (15) through the second valve.

5. The system of claim 2, wherein the molten salt thermal storage is coupled to the gas-steam combined cycle power generation system by a heat exchanger. The outlet of the steam turbine (5) is connected with the water inlet of the molten salt boiler (12) through the condenser (6), the water pump (7) and the third valve.

6. The system of claim 2, wherein the molten salt thermal storage is coupled to the gas-steam combined cycle power generation system by a heat exchanger. The compressor (1), the gas turbine (3), the generator (4) and the steam turbine (5) are coaxially arranged.

7. The system of claim 2, wherein the molten salt thermal storage is coupled to the gas-steam combined cycle power generation system by a heat exchanger. The molten salt heat storage and release subsystem comprises a molten salt flue gas heat exchanger (9), a low-temperature molten salt tank (10), a high-temperature molten salt tank (11) and a molten salt boiler (12). The molten salt outlet of the waste heat boiler (8) is connected to the inlet of the high-temperature molten salt tank (11) through the tube side of the molten salt flue gas heat exchanger (9), the outlet of the high-temperature molten salt tank (11) is connected to the molten salt inlet of the molten salt boiler (12), the molten salt outlet of the molten salt boiler (12) is connected to the inlet of the low-temperature molten salt tank (10), and the outlet of the low-temperature molten salt tank (10) is connected to the molten salt inlet of the waste heat boiler (8).

8. The cogeneration system of claim 7, wherein the molten salt thermal storage is coupled to the biomass energy storage. The flue gas outlet of the combustion furnace (19) is connected to the flue gas inlet of the waste heat boiler (8) through the shell side of the molten salt flue gas heat exchanger (9).

9. The system of claim 7, wherein the molten salt thermal storage is coupled to the gas-steam combined cycle power generation system by a heat exchanger. The flue gas outlet of the biomass pyrolysis furnace (13) is connected to the flue gas inlet of the waste heat boiler (8).

10. The cogeneration system of claim 7, wherein the molten salt thermal storage is coupled to the biomass energy storage. The biomass input pipeline is connected to the inlet of the biomass pyrolysis furnace (13) and the inlet of the biomass steam gasification furnace (15).

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