Single-cycle gas turbine coupling fused salt heat storage industrial steam supply system and working method

Abstract

The invention belongs to the technical field of single-cycle gas turbine coupling fused salt heat storage and heat supply, and discloses a single-cycle gas turbine coupling fused salt heat storage industrial steam supply system and a working method. High-temperature flue gas generated by a single-cycle gas turbine system passes through a first heat exchanger, and part of heat energy is transmitted to a fused salt heat storage system. The waste heat in the flue gas of the gas turbine can be effectively recycled, and the energy utilization efficiency of the whole system is improved. The fused salt heat storage system has the large heat capacity, heat energy can be stored when the power demand is low or energy is surplus, and the stored heat energy is released in the peak period or when heat consumers need. In this way, the flexibility of the system and the timeliness scheduling capability of heat energy are improved. By efficiently recycling and utilizing waste heat, the system can reduce direct consumption of fossil fuel, so that the emission of greenhouse gases such as carbon dioxide is reduced, and more environment-friendly energy supply can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of single - cycle gas turbine coupled with molten salt thermal energy storage for heat supply, and particularly relates to a single - cycle gas turbine coupled with molten salt thermal energy storage industrial steam supply system and its working method. Background Technique

[0002] Classified by the type of prime mover, thermal power units mainly include steam turbine generator sets, gas turbine generator sets, etc. Gas turbine generator sets, which can also be simply referred to as "gas turbines", mostly use natural gas, an environmentally friendly thermal power generation fuel. According to the characteristics of the thermodynamic cycle, gas turbines can be divided into single - cycle generator sets and gas - steam combined cycle generator sets. A single - cycle gas turbine is a cycle system independently composed of a gas turbine and a generator. The high - temperature exhaust gas in the combustion section is directly discharged into the atmosphere, having the advantages of fast installation and flexible start - stop.

[0003] With the promotion of the spot market and the development of renewable energy, the ability of the unit to start and stop quickly can avoid low - price losses and strive for high - efficiency power generation. A single - cycle gas turbine can complete startup and reach full load within 15 minutes, quickly participate in peak load guarantee, and is 2 - 3 times the ramping rate of combined - cycle gas turbines and conventional coal - fired units. Similarly, the output of a single - cycle gas turbine can also drop rapidly, improving the peak - shaving ability. In the future construction of a unified capacity market, both gas turbines and coal - fired power will be charged capacity fees. Since the cost of a single - cycle gas turbine (not exceeding 2000 yuan per kilowatt) is much lower than that of a coal - fired power unit, with the increase of the coal - fired power capacity fee, the single - cycle gas turbine can basically make up for the fixed investment under the condition of obtaining the same capacity fee. However, in the existing single - cycle gas turbine, the high - temperature exhaust gas in the combustion section is directly discharged into the atmosphere without any waste heat utilization, resulting in a low cycle efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiency that the high - temperature exhaust gas of the above - mentioned single - cycle gas turbine is not utilized for any waste heat, resulting in a low cycle efficiency, and provide a single - cycle gas turbine coupled with molten salt thermal energy storage industrial steam supply system and its working method.

[0005] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a single - cycle gas turbine coupled with molten salt thermal energy storage industrial steam supply system, including a single - cycle gas turbine system. The flue gas outlet of the single - cycle gas turbine system is connected to the heat source side of a first heat exchanger. The cold source side of the first heat exchanger is connected to a molten salt thermal energy storage system. The molten salt thermal energy storage system is connected to the heat source side of a second heat exchanger. The cold source side of the second heat exchanger is connected to a heat user.

[0006] A further improvement of the present invention is that the first heat exchanger adopts a flue gas - molten salt heat exchanger.

[0007] A further improvement of the present invention is that the second heat exchanger adopts a molten salt - water heat exchanger.

[0008] A further improvement of the present invention is that the molten salt thermal energy storage system includes a molten salt cold tank. The outlet of the molten salt cold tank is connected to the cold source side inlet of the first heat exchanger. The cold source side outlet of the first heat exchanger is connected to the inlet of the molten salt hot tank. The outlet of the molten salt hot tank is connected to the heat source side inlet of the second heat exchanger. The heat source side inlet of the second heat exchanger is connected to the inlet of the molten salt cold tank.

[0009] A further improvement of the present invention is that a first molten salt pump is provided on the pipeline between the molten salt cold tank and the first heat exchanger.

[0010] A further improvement of the present invention is that a second molten salt pump is provided on the pipeline between the molten salt hot tank and the second heat exchanger.

[0011] A further improvement of the present invention is that the single-cycle gas turbine system includes a generator, a compressor, and a turbine. The generator, the compressor, and the turbine are coaxially connected. The compressor is connected to the combustion chamber. The combustion chamber is connected to the turbine. The turbine is provided with a flue gas outlet.

[0012] A further improvement of the present invention is that the cold source side inlet of the second heat exchanger is connected to a water supply source. A feed water booster pump is provided on the pipeline between the water supply source and the second heat exchanger. The cold source side outlet of the second heat exchanger is connected to industrial steam supply.

[0013] In a second aspect, the present invention provides a working method of a single-cycle gas turbine coupled with a molten salt thermal energy storage industrial steam supply system, including the following steps: The flue gas of the single-cycle gas turbine system is sent to the heat source side of the first heat exchanger; The heat source side of the first heat exchanger heats the molten salt in the cold source side; The heated molten salt enters the heat source side of the second heat exchanger and heats the working medium in the cold source side of the second heat exchanger; The heated working medium in the cold source side of the second heat exchanger is sent to the heat user, and the molten salt after heat exchange in the heat source side is sent to the cold source side of the first heat exchanger.

[0014] A further improvement of the present invention is that the molten salt after heat exchange in the first heat exchanger is sent into the molten salt hot tank; When heat exchange is required in the second heat exchanger, the molten salt in the molten salt hot tank is sent into the second heat exchanger for heat exchange, and the molten salt after heat exchange is sent into the molten salt cold tank; When heat exchange is required in the first heat exchanger, the molten salt in the molten salt cold tank is sent into the first heat exchanger for heat exchange.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention transfers part of the thermal energy of the high-temperature flue gas generated by the single-cycle gas turbine system to the molten salt thermal energy storage system through the first heat exchanger. This can effectively recover the waste heat in the gas turbine flue gas and improve the energy utilization efficiency of the overall system. The molten salt thermal energy storage system has a large heat capacity and can store thermal energy when the power demand is low or there is an energy surplus, and release the stored thermal energy during peak periods or when heat users need it. This method improves the flexibility of the system and the timeliness scheduling ability of thermal energy. By efficiently recovering and utilizing waste heat, the system of the present invention can reduce the direct consumption of fossil fuels, thereby reducing the emissions of greenhouse gases such as carbon dioxide, and contributing to a more environmentally friendly energy supply. The system of the present invention can provide a stable and continuous heat source for industrial users through coupling with the molten salt thermal energy storage technology, without being affected by the fluctuations in the operating state of the gas turbine, enhancing the reliability of industrial steam supply. The present invention adopts the molten salt thermal energy storage system to alleviate the high load and thermal shock problems brought by the direct heat supply of the gas turbine system, thereby helping to reduce the wear and aging of equipment, extend the service life of equipment, balance the energy supply and demand by storing off-peak electricity or waste heat and releasing thermal energy during the peak energy demand period, reduce the operating cost, and thus improve the overall economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a system diagram of the present invention; Among them, 1. single-cycle gas turbine system; 2. first heat exchanger; 3. molten salt thermal energy storage system; 4. second heat exchanger; 5. molten salt cold tank; 6. molten salt hot tank; 7. first molten salt pump; 8. second molten salt pump; 9. generator; 10. compressor; 11. turbine; 12. combustion chamber; 13. feed water booster pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To further understand the content of the present invention, the following will describe the present invention in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and not for limiting it. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0018] Embodiment 1: A single-cycle gas turbine coupled molten salt thermal energy storage industrial steam supply system includes a single-cycle gas turbine system 1. The flue gas outlet of the single-cycle gas turbine system 1 is connected to the heat source side of the first heat exchanger 2. The cold source side of the first heat exchanger 2 is connected to the molten salt thermal energy storage system 3. The molten salt thermal energy storage system 3 is connected to the heat source side of the second heat exchanger 4. The cold source side of the second heat exchanger 4 is connected to the heat user.

[0019] The working method of this embodiment includes the following steps: S1. The flue gas of the single-cycle gas turbine system 1 is sent to the heat source side of the first heat exchanger 2; S2. The heat source side of the first heat exchanger 2 heats the molten salt in the cold source side. S3. The heated molten salt enters the heat source side of the second heat exchanger 4 to heat the working fluid in the cold source side of the second heat exchanger 4. S4. The heated working fluid in the cold source side of the second heat exchanger 4 is sent to the heat user, and the molten salt after heat exchange in the heat source side is sent to the cold source side of the first heat exchanger 2.

[0020] Embodiment 2: The structure of this embodiment is the same as that of Embodiment 1. The difference is that the molten salt thermal energy storage system 3 includes a molten salt cold tank 5. The outlet of the molten salt cold tank 5 is connected to the inlet of the cold source side of the first heat exchanger 2. The outlet of the cold source side of the first heat exchanger 2 is connected to the inlet of the molten salt hot tank 6. The outlet of the molten salt hot tank 6 is connected to the inlet of the heat source side of the second heat exchanger 4, and the inlet of the heat source side of the second heat exchanger 4 is connected to the inlet of the molten salt cold tank 5.

[0021] During operation, the molten salt after heat exchange in the first heat exchanger 2 is sent into the molten salt hot tank 6. When heat exchange is required in the second heat exchanger 4, the molten salt in the molten salt hot tank 6 is sent into the second heat exchanger 4 for heat exchange, and the molten salt after heat exchange is sent into the molten salt cold tank 5. When heat exchange is required in the first heat exchanger 2, the molten salt in the molten salt cold tank 5 is sent into the first heat exchanger 2 for heat exchange.

[0022] In this embodiment, by separately managing the molten salt cold tank and the hot tank, the hot state and the cold state of the molten salt can be effectively distinguished, achieving layered heat storage. This can more precisely manage the heat energy distribution of the molten salt, improve the heat storage and heat release efficiency of the system, and reduce unnecessary heat losses. The introduction of the molten salt cold tank and the molten salt hot tank can ensure that the heat exchanger is always in the best working conditions. For example, the first heat exchanger always receives low-temperature molten salt from the cold tank, and the second heat exchanger always receives high-temperature molten salt from the hot tank, which ensures a large temperature difference during the operation of the heat exchanger, thus improving the heat exchange efficiency. The design of this embodiment enables the molten salt to always have a clear flow path during the circulation process, from the cold tank to the hot tank and then to the user. This circulation mode helps to stabilize the heat circulation of the entire system and reduce the system instability caused by temperature fluctuations. In this embodiment, since the molten salt cold tank and the hot tank store molten salts at different temperatures respectively, the sharp temperature change during the heat exchange process is avoided, the thermal stress on the equipment, especially the heat exchanger, is reduced, which helps to extend the service life of the equipment and reduce the maintenance and replacement costs. The separated design of the molten salt cold tank and the hot tank makes the system more flexible in responding to different heat demands. Whether the system is in the heat storage or heat supply stage, it can quickly respond to the demand change by switching the molten salt flow path, providing a faster heat supply response ability. In this embodiment, since the molten salt cold tank and the hot tank store high-temperature and low-temperature molten salts separately, the mixing of molten salts at different temperatures can be avoided, thereby reducing heat loss and enhancing the overall heat storage capacity and heat storage efficiency of the system. The method of storing molten salt in separate tanks proposed in this embodiment reduces the temperature gradient in the storage tank, thereby reducing the loss of the storage tank material by high-temperature molten salt and enhancing the safety and reliability of the system operation. In summary, the newly added molten salt cold tank and molten salt hot tank design in this embodiment optimizes the heat storage management, improves the heat exchange efficiency, enhances the stability and flexibility of the system, while extending the equipment life and improving the safety and economic benefits of the system.

[0023] Embodiment 3: In this embodiment, the first heat exchanger 2 is preferably defined as a flue gas - molten salt heat exchanger. The flue gas of the single - cycle gas turbine system 1 usually has a relatively high temperature. Through a dedicated flue gas - molten salt heat exchanger, the waste heat in the flue gas can be efficiently recovered and transferred to the molten salt. This efficient heat exchange can maximize the utilization of the heat in the gas turbine flue gas, reduce energy waste, and improve the overall thermal efficiency of the system. Molten salt has good high - temperature heat conduction performance and a relatively high specific heat capacity, and can effectively absorb and store the high - temperature heat in the gas turbine flue gas. Compared with media such as water vapor, molten salt is more stable at high temperatures, reducing the energy loss caused by phase change, thereby further improving the heat energy storage and transfer efficiency of the system. The flue gas discharged from the single - cycle gas turbine system 1 may contain corrosive components. The chemical properties of molten salt are stable, which can effectively isolate these harmful substances in the flue gas, reduce the wear caused by corrosion or scaling of the heat exchanger, and extend the service life of the equipment. Compared with traditional water - flue gas heat exchange, molten salt medium is more durable in high - temperature and corrosive environments. To sum up, the system of this embodiment can more efficiently recover and utilize the waste heat in high - temperature flue gas, while improving the stability, durability, and flexibility of the system to meet the needs of different industrial scenarios.

[0024] Example 4: In this embodiment, the second heat exchanger 4 is preferably defined as a molten salt - water heat exchanger. In this embodiment, the molten salt - water heat exchanger can heat water to a high temperature or even convert it into steam in a short time, meeting the needs of industrial users for high - temperature steam. This is of great significance for the rapid response of the industrial steam supply system, especially in industrial application scenarios with large load fluctuations, where it can quickly adjust and provide steam. Compared with traditional water - water heat exchangers, molten salt can maintain a higher temperature and provide a larger temperature difference, thus improving the heat exchange efficiency. The molten salt - water heat exchanger can provide industrial users with various forms of heat energy, including high - temperature steam and hot water, to meet the needs of different industries such as chemical industry, textile, paper - making, food processing, etc. This diverse form of heat supply makes the system application scenario more extensive. The heat exchanger in this embodiment can be directly compatible with the existing traditional steam system, providing efficient heat energy supplement through the molten salt heat storage system, without the need for large - scale modification of the existing system and can improve the overall heat energy utilization efficiency. To sum up, this embodiment can make full use of the excellent heat storage characteristics of molten salt, efficiently transfer the heat in molten salt to water, and achieve efficient, flexible, and safe industrial heat supply and steam supply. Such a design improves the heat energy transfer efficiency, enhances the stability and response ability of the system, and also has significant advantages in reducing equipment wear and energy consumption. The system has a wide range of application scenarios and can effectively improve the energy utilization efficiency and economic benefits of enterprises.

[0025] Example 5: The structure of this embodiment is the same as that of Embodiment 2. The difference lies in that a first molten salt pump 7 is provided on the pipeline between the molten salt cold tank 5 and the first heat exchanger 2, and a second molten salt pump 8 is provided on the pipeline between the molten salt hot tank 6 and the second heat exchanger 4. In this embodiment, by adding molten salt pumps, the flow rate and flow of molten salt in the system can be actively controlled, enabling the molten salt to be transferred as needed at different stages, rather than relying on natural convection or other passive methods. This active flow control improves the operating efficiency of the entire system, ensuring a more stable and efficient heat exchange process. The introduction of molten salt pumps can be combined with the system's automatic control. By adjusting the operating speed and working state of the pumps, precise control of the molten salt flow rate can be achieved. This not only improves the automation level of the system but also enables adjustment according to real-time operating conditions, reducing manual intervention and enhancing the intelligence and efficiency of the system. In summary, adding the first molten salt pump and the second molten salt pump in the pipeline enables the system to better control the flow of molten salt, improving the heat exchange efficiency, stability, and flexibility of the system. By actively adjusting the molten salt flow rate, the system can transfer heat energy more efficiently, reduce heat loss and equipment wear, while improving the automatic control ability, enhancing the reliability and lifespan of the system. This design optimizes the performance of the entire molten salt thermal energy storage industrial steam supply system, making it more economical and practical in various application scenarios.

[0026] Embodiment 6: This embodiment further defines the single-cycle gas turbine system 1 in the above embodiment. The single-cycle gas turbine system 1 includes a generator 9, a compressor 10, and a turbine 11. The generator 9, the compressor 10, and the turbine 11 are coaxially connected. The compressor 10 is connected to the combustion chamber 12, the combustion chamber 12 is connected to the turbine 11, and the turbine 11 is provided with a flue gas outlet.

[0027] The compressor 10 of the single-cycle gas turbine system 1 draws in air from the atmosphere and compresses it through the compressor 10 to increase the pressure and density of the air in preparation for combustion. The compressed air is sent into the combustion chamber 12, where the air is mixed with fuel and ignited. The combustion process generates high-temperature and high-pressure gas, which has a high thermal energy. The high-temperature and high-pressure gas then enters the turbine 11, driving the turbine 11 blades to rotate. The turbine 11, the compressor 10, and the rotor of the generator 9 are coaxially connected. Therefore, the rotation of the turbine 11 can drive the normal operation of the compressor 10 and at the same time drive the generator to generate electricity. The high-temperature exhaust gas generated after the air enters the turbine 11 for power generation enters the first heat exchanger 2.

[0028] Embodiment 7: In this embodiment, the heat users in Embodiment 1 are further defined. The inlet of the cold source side of the second heat exchanger 4 is connected to the water supply source. A feed water booster pump 13 is provided on the pipeline between the water supply source and the second heat exchanger 4. The outlet of the cold source side of the second heat exchanger 4 is connected to industrial steam supply. In this embodiment, the feed water booster pump can provide feed water with stable and sufficient pressure, enabling the second heat exchanger to generate high-quality steam and avoiding the problem of unstable steam quality caused by water pressure fluctuations. Especially in industrial applications with high requirements for steam quality (such as food processing, pharmaceutical manufacturing, etc.), this design ensures that the system can always provide steam that meets the requirements. The additional content in this embodiment enables the system to have higher efficiency, flexibility, and reliability during industrial steam supply. It improves the quality and supply stability of steam, while enhancing the system's automatic control ability and economic benefits. This design can better meet the diverse needs of the industrial field for steam and optimize the energy utilization of the system.

[0029] The present invention contemplates using the exhaust gas of a single-cycle gas turbine to heat molten salt, storing the heat in the molten salt, and further using the high-temperature molten salt to heat feed water to generate steam for external industrial steam supply. Molten salt is usually a molten liquid salt and is an ideal heat storage medium, having excellent electrical conductivity in the molten state, a wide and stable operating temperature range, low steam pressure, large heat capacity, strong ability to dissolve impurities, and stable chemical properties. Currently, in molten salt heat storage systems, the conversion from low-temperature molten salt to high-temperature molten salt mostly uses electric heating, using raw materials such as nitrates as heat transfer media to store and release energy through the conversion of electrical energy and the internal energy of molten salt, achieving effective energy transfer. Using a molten salt heat storage system to heat feed water for industrial steam supply has been applied in many coal-fired cogeneration units in China, which can not only promote the thermal electrolysis decoupling of coal-fired power units but also ensure the reliability and safety of industrial steam supply. The technical solutions and engineering application methods are relatively mature.

[0030] The present invention uses the exhaust gas of a single-cycle gas turbine to heat molten salt and further uses the high-temperature molten salt to heat feed water to generate steam for external industrial steam supply. On the one hand, it takes advantage of the flexibility of the single-cycle gas turbine, such as fast start-stop and high ramp rate, to avoid low-cost electricity losses and strive for high-efficiency power generation. On the other hand, it uses the molten salt heat storage system to achieve cascaded utilization of thermal energy, greatly improving the cycle efficiency of the single-cycle gas turbine. At the same time, coupling the gas turbine and the molten salt heat storage system can increase the peak shaving capacity of the gas turbine, help the gas turbine achieve thermal electrolysis decoupling, and meet diverse heating demands.

[0031] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0032] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. A person skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art. The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A single-cycle gas turbine coupled molten salt heat storage industrial steam supply system, characterized in that: The invention comprises a single-cycle gas turbine system (1), wherein the flue gas outlet of the single-cycle gas turbine system (1) is connected to the heat source side of a first heat exchanger (2), the cold source side of the first heat exchanger (2) is connected to a molten salt heat storage system (3), the molten salt heat storage system (3) is connected to the heat source side of a second heat exchanger (4), and the cold source side of the second heat exchanger (4) is connected to a heat user.

2. The single-cycle gas turbine coupled molten salt heat storage industrial steam supply system according to claim 1 is characterized in that: The first heat exchanger (2) is a flue gas-molten salt heat exchanger.

3. The single-cycle gas turbine coupled molten salt heat storage industrial steam supply system according to claim 1 is characterized in that: The second heat exchanger (4) is a molten salt-water heat exchanger.

4. The single-cycle gas turbine coupled molten salt heat storage industrial steam supply system according to claim 1 is characterized in that: The molten salt heat storage system (3) comprises a molten salt cold tank (5), the outlet of the molten salt cold tank (5) being connected to the cold source side inlet of the first heat exchanger (2), the cold source side outlet of the first heat exchanger (2) being connected to the inlet of the molten salt hot tank (6), the outlet of the molten salt hot tank (6) being connected to the hot source side inlet of the second heat exchanger (4), and the hot source side inlet of the second heat exchanger (4) being connected to the inlet of the molten salt cold tank (5).

5. The single-cycle gas turbine coupled molten salt heat storage industrial steam supply system according to claim 4 is characterized in that: A first molten salt pump (7) is provided on the pipeline between the molten salt cold tank (5) and the first heat exchanger (2).

6. The single-cycle gas turbine coupled molten salt heat storage industrial steam supply system according to claim 4 is characterized in that: A second molten salt pump (8) is provided on the pipeline between the molten salt hot tank (6) and the second heat exchanger (4).

7. The single-cycle gas turbine coupled molten salt thermal storage industrial steam supply system according to claim 1 is characterized in that: The single-cycle combustion engine system (1) comprises a generator (9), a compressor (10) and a turbine (11). The generator (9), the compressor (10) and the turbine (11) are coaxially connected. The compressor (10) is connected to a combustion chamber (12), the combustion chamber (12) is connected to the turbine (11), and the turbine (11) is provided with a flue gas outlet.

8. The single-cycle gas turbine coupled molten salt thermal storage industrial steam supply system according to claim 1 is characterized in that: The cold source side inlet of the second heat exchanger (4) is connected to a water supply source, a water supply booster pump (13) is provided on a pipeline between the water supply source and the second heat exchanger (4), and the cold source side outlet of the second heat exchanger (4) is connected to an industrial steam supply.

9. A working method of a single-cycle gas engine coupled molten salt thermal storage industrial steam supply system according to claim 1, characterized in that: The following steps are involved: Flue gas from the single-cycle combustion engine system (1) is fed into the heat source side of the first heat exchanger (2); The heat source side of the first heat exchanger (2) heats the molten salt in the cold source side; The heated molten salt enters the heat source side of the second heat exchanger (4) to heat the working fluid on the cold source side of the second heat exchanger (4); The working fluid heated in the cold source side of the second heat exchanger (4) is sent to the heat user, and the molten salt after heat exchange in the hot source side is sent to the cold source side of the first heat exchanger (2).

10. The working method of a single-cycle gas turbine coupled molten salt thermal storage industrial steam supply system according to claim 9, characterized in that: The molten salt after heat exchange in the first heat exchanger (2) is sent to the molten salt hot tank (6); When the second heat exchanger (4) needs to exchange heat, the molten salt in the molten salt hot tank (6) is sent to the second heat exchanger (4) for heat exchange, and the molten salt after heat exchange is sent to the molten salt cold tank (5); When the first heat exchanger (2) needs to exchange heat, the molten salt in the molten salt cold tank (5) is fed into the first heat exchanger (2) for heat exchange.

Images