Gas turbine system coupled with high-temperature heat pump and energy storage and operation method of gas turbine system

Abstract

The invention provides a gas turbine system coupled with a high-temperature heat pump and energy storage and an operation method of the gas turbine system. The gas turbine system comprises a gas turbine system body, a high-temperature heat pump system and an energy storage system, the gas turbine system body comprises a first generator, a gas compressor, a combustion chamber and a turbine, and a first heat exchanger is arranged on a flue gas pipeline A1; air flows through the gas compressor, the combustion chamber and the turbine, and flue gas flowing out of the turbine flows through the flue gas pipeline A1 and the flue gas side of the first heat exchanger; the high-temperature heat pump system comprises a first heat exchanger, a second heat exchanger, an expansion machine and a compressor, and a working medium of the high-temperature heat pump flows through a first heat exchanger working medium side, the compressor, a second heat exchanger working medium side and the expansion machine and returns to the first heat exchanger working medium side; the energy storage system comprises a high-temperature tank and a low-temperature tank, and a heat storage medium in the low-temperature tank flows through the heat storage medium side of the second heat exchanger and flows into the high-temperature tank to be stored. The high-temperature heat pump and the energy storage system are coupled, so that the exhaust temperature of the gas turbine is reduced, and the efficiency of the gas turbine and the steam turbine is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power generation, and in particular relates to a gas turbine system coupled with a high-temperature heat pump and energy storage and an operation method thereof. Background Art

[0002] Gas turbines are usually combined with waste heat boilers and steam turbines to form combined cycle units to improve energy utilization efficiency.

[0003] The exhaust temperature of the gas turbine is an important parameter in the system design, which affects the overall efficiency of the entire gas-steam combined cycle unit. For a combined cycle unit with a given initial temperature, if the exhaust temperature of the gas turbine decreases, the power and efficiency of the gas turbine will increase, but it will cause the thermal parameters of the waste heat boiler and steam turbine system to decrease, thus affecting the efficiency and output of the combined cycle; if the exhaust temperature of the gas turbine increases, the efficiency of the combined cycle will generally increase, but it will affect the safety of the exhaust cylinder and the manufacturing cost of the gas turbine. Therefore, when designing a gas turbine, its exhaust temperature will generally be comprehensively considered and the optimal value will be taken. Summary of the invention

[0004] Based on the mutual constraints between the gas turbine and the steam turbine, the present invention provides a gas turbine system coupled with a high-temperature heat pump and energy storage and an operation method thereof. By coupling the high-temperature heat pump with the energy storage system, the gas turbine and the steam turbine are decoupled to reduce the exhaust temperature of the gas turbine, thereby improving the output of the gas turbine and the efficiency of the gas turbine. At the same time, the steam parameters of the steam turbine can be improved, the flexibility of the system can be improved, and the overall benefit of the system can be improved.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A gas turbine system coupled with a high-temperature heat pump and energy storage, comprising: a gas turbine system, a high-temperature heat pump system, and an energy storage system;

[0007] The gas turbine system includes a first generator, a compressor, a combustion chamber, a turbine and a flue gas duct A1, and the first heat exchanger is arranged on the flue gas duct A1; air flows through the compressor, the combustion chamber and the turbine, and the flue gas flowing out of the turbine flows through the flue gas duct A1 and the flue gas side of the first heat exchanger;

[0008] The high-temperature heat pump system includes a first heat exchanger, a second heat exchanger, an expander, and a compressor. The expander, the first heat exchanger, the compressor, and the second heat exchanger are connected through a working medium pipeline B1. The working medium of the high-temperature heat pump flows through the working medium side of the first heat exchanger, the compressor, the working medium side of the second heat exchanger, and the expander, and returns to the working medium side of the first heat exchanger.

[0009] The energy storage system includes a high-temperature tank and a low-temperature tank. The high-temperature tank, the second heat exchanger and the low-temperature tank are connected via a heat storage medium pipeline C1. The heat storage medium in the low-temperature tank flows through the heat storage medium side of the second heat exchanger and flows into the high-temperature tank for storage.

[0010] Preferably, an electric heater is also included, which is connected to the low-temperature tank and the high-temperature tank through a heat storage medium pipeline C2, and the heat storage medium in the low-temperature tank flows into the electric heater for heating, and then flows into the high-temperature tank.

[0011] Preferably, the heat storage medium of the energy storage system is molten salt, and the temperature of the molten salt passing through the second heat exchanger is heated from 190°C-200°C to 610°C-650°C.

[0012] Preferably, it also includes a power generation system and a third heat exchanger, and the high temperature tank, the third heat exchanger and the low temperature tank are connected via a heat storage medium pipeline C3;

[0013] The heat storage medium of the energy storage system flows through the heat storage medium side of the third heat exchanger for heat exchange, and the working medium side of the third heat exchanger flows through the working medium of the power generation system, and the power generation system generates electricity using the heated working medium.

[0014] Preferably, the working medium of the power generation system is water vapor, and the power generation system includes a steam turbine and a second generator coaxially arranged with the steam turbine. The third heat exchanger and the steam turbine are connected through a working medium pipeline D1. The water flow in the water supply end is heated into water vapor through the working medium side of the third heat exchanger. The water vapor flows into the steam turbine to perform work and generates electricity through the second generator.

[0015] Preferably, the working fluid of the high-temperature heat pump is gas, the temperature range of the gas after heat exchange through the first heat exchanger is 440°C-540°C, and the temperature range of the gas flowing out of the first heat exchanger after being compressed by the compressor is 550°C-650°C.

[0016] A method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is operating with flue gas, the flue gas pipeline A1, the working medium pipeline B1 and the heat storage medium pipeline C1 are opened, the high-temperature heat pump system and the energy storage system are operating, and the energy storage system stores heat of the heat storage medium:

[0017] The air flows through the compressor and combustion chamber, and the turbine generates power. The high-temperature flue gas flowing out of the turbine flows through the flue gas side of the first heat exchanger, and the heat of the high-temperature flue gas heats the working medium on the working medium side of the first heat exchanger. The cooled flue gas flows out from the flue gas side of the first heat exchanger and enters the flue gas outlet pipe.

[0018] The heated working fluid enters the compressor for compression, further increasing the temperature of the working fluid. The high-temperature gas flowing out of the compressor then enters the working fluid side of the second heat exchanger, and uses the heat of the high-temperature working fluid to heat the heat storage medium on the heat storage medium side of the second heat exchanger. After absorbing the heat, the heat storage medium flows into the high-temperature tank to store the heat. The heat can be used to generate electricity and connect to the grid during peak power or demand, or for heating, etc.

[0019] Preferably, when there is power abandonment or valley power, the heat storage medium pipeline C2 is opened, the electric heater heats the heat storage medium in the low-temperature tank, and the heated heat storage medium is stored in the high-temperature tank.

[0020] Preferably, during peak electricity or when there is demand, the heat storage medium pipeline C3 is opened, the power generation system and the third heat exchanger work, the high-temperature heat storage medium in the heat storage system heats the working fluid in the power generation system through the third heat exchanger, and the power generation system converts the heat of the high-temperature working fluid into electrical energy.

[0021] A method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage. When the gas turbine system is not working and there is no smoke, the smoke pipeline A1, the working medium pipeline B1 and the heat storage medium pipeline C1 are closed, and the high-temperature heat pump system is not working.

[0022] Preferably, during peak electricity or when there is demand, the heat storage medium pipeline C3 is opened, the power generation system and the third heat exchanger work, the high-temperature heat storage medium in the heat storage system heats the working fluid in the power generation system through the third heat exchanger, and the power generation system converts the heat of the high-temperature working fluid into electrical energy.

[0023] A method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is not operating and there is no flue gas, the flue gas pipeline A1, the working fluid pipeline B1 and the heat storage medium pipeline C1 are closed; when there is abandoned power or valley power, the heat storage medium pipeline C2 is opened, and the electric heater operates to heat the heat storage medium, and the heated heat storage medium is stored in the energy storage system.

[0024] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0025] (1) The gas turbine system coupled with a high-temperature heat pump and an energy storage system provided by the present invention couples the high-temperature heat pump system and the energy storage system to the gas turbine. When the gas turbine is running and generates flue gas, the first heat exchanger is used to transfer the heat in the flue gas to the working medium in the high-temperature heat pump system, thereby reducing the flue gas temperature discharged by the gas turbine; and the high-temperature heat pump system can increase the temperature received by the first heat exchanger, and exchange the high-quality heat to the heat storage medium of the energy storage system to achieve high-temperature energy storage, and the stored heat energy can be used for power generation or heating. Therefore, the system of the present application can reduce the exhaust temperature of the gas turbine, improve the output and efficiency of the gas turbine, and at the same time improve the steam parameters of the steam turbine, improve the output and efficiency of the steam turbine, realize the decoupling of the gas turbine and the steam turbine, and improve the overall efficiency of the system.

[0026] (2) In one embodiment of the present invention, an electric heater is further provided. When power is abandoned or the power grid is in a valley period, the low-temperature heat storage medium can be heated and heat can be stored by the electric heater, thereby converting the abandoned power or valley power into thermal energy for storage. When needed, the thermal energy stored in the high-temperature tank can be converted into electrical energy by the power generation system, thereby effectively improving the operational flexibility and overall comprehensive benefits of the system and achieving the effect of peak shaving and valley filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a gas turbine system coupled with a high-temperature heat pump and energy storage provided by the present invention.

[0028] Description of reference numerals:

[0029] 1. First generator; 2. Compressor; 3. Combustion chamber; 4. Turbine; 5. First heat exchanger; 6. Compressor; 7. Second heat exchanger; 8. Expander; 9. Electric heater; 10. Third heat exchanger; 11. Low-temperature tank; 12. Low-temperature pump; 13. High-temperature tank; 14. High-temperature pump; 15. Steam turbine; 16. Second generator. DETAILED DESCRIPTION

[0030] The following is a further detailed description of a gas turbine system coupled with a high temperature heat pump and energy storage and its operation method proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description.

[0031] It should be noted that usually a gas turbine and a steam turbine form a gas-steam combined cycle system, and there is a contradiction between the exhaust temperature of the gas turbine and the efficiency of the combined cycle. In order to solve this contradiction, the present application designs a gas turbine system coupled with a high-temperature heat pump and energy storage.

[0032] See also Figure 1, a gas turbine system coupled with a high-temperature heat pump and energy storage, is used to decouple the gas turbine from the steam turbine, improve system efficiency, and increase system operation flexibility and overall benefits.

[0033] A gas turbine system coupled with a high-temperature heat pump and energy storage comprises: a gas turbine system, a high-temperature heat pump system, and an energy storage system.

[0034] The gas turbine system includes a first generator 1, a compressor 2, a combustion chamber 3, a turbine 4 and a flue gas duct A1, and the first heat exchanger 5 is arranged on the flue gas duct A1; air flows through the compressor 2, the combustion chamber 3, and the turbine 4, and the flue gas flowing out of the turbine 4 flows through the flue gas duct A1 and the flue gas side of the first heat exchanger 5, and then flows into the flue gas outlet pipe.

[0035] After being compressed and heated by the compressor 2, the air enters the combustion chamber 3 and burns with the fuel gas. The high-temperature and high-pressure flue gas generated enters the turbine 4. The turbine 4 drives the first generator 1 to generate electricity. The flue gas flowing out of the turbine 4 heats the working fluid of the high-temperature heat pump system in the first heat exchanger 5.

[0036] The high-temperature heat pump system includes a first heat exchanger 5, a second heat exchanger 7, an expander 8, and a compressor 6. The expander 8, the first heat exchanger 5, the compressor 6, and the second heat exchanger 7 are connected through a working fluid pipeline B1. The working fluid of the high-temperature heat pump flows through the working fluid side of the first heat exchanger 5, the compressor 6, the working fluid side of the second heat exchanger 7, and the expander 8, and returns to the working fluid side of the first heat exchanger 5.

[0037] The low-temperature and low-pressure working fluid of the high-temperature heat pump system flows through the working fluid side of the first heat exchanger 5, absorbs the temperature of the flue gas side of the first heat exchanger 5, and then flows into the compressor 6 for compression and temperature increase. The high-temperature and high-pressure gas flowing out of the compressor 6 flows into the working fluid side of the second heat exchanger 7, transfers heat to the heat storage medium of the energy storage system, and the low-temperature and high-pressure working fluid after cooling flows out from the working fluid side of the second heat exchanger 7, enters the expander 8 to expand and do work, and flows out the low-temperature and low-pressure working fluid, and then returns to the working fluid side of the first heat exchanger 5.

[0038] Preferably, the working fluid of the high-temperature heat pump is gas, and the temperature range of the gas after heat exchange in the first heat exchanger 5 is 440°C-540°C, and the temperature range of the gas flowing out of the first heat exchanger 5 after being compressed in the compressor 6 is 550°C-650°C.

[0039] The energy storage system includes a high-temperature tank 13 and a low-temperature tank 11. The high-temperature tank 13, the second heat exchanger 7 and the low-temperature tank 11 are connected via a heat storage medium pipeline C1. The heat storage medium in the low-temperature tank 11 is pumped out via a low-temperature pump 12 and flows into the heat storage medium side of the second heat exchanger 7 to absorb the high-temperature and high-pressure heat of the high-temperature heat pump. The high-temperature heat storage medium flowing out of the heat storage medium of the second heat exchanger 7 flows into the high-temperature tank 13 for storage.

[0040] In this embodiment, the gas turbine is coupled to the high-temperature heat pump system through the first heat exchanger 5, and the high-temperature heat pump system is coupled to the heat storage system through the second heat exchanger 7, so that when the gas turbine is running to generate flue gas, the high-temperature heat pump absorbs the heat in the flue gas and then reduces the flue gas temperature, thereby improving the gas turbine output and efficiency, and at the same time improving the steam parameters of the steam turbine 15, improving the output and efficiency of the steam turbine 15, realizing the decoupling of the gas turbine and the steam turbine 15, and improving the overall efficiency of the system. After the working fluid of the high-temperature heat pump absorbs the heat in the flue gas and heats up, it is heated again by the compressor 6, and the heat of the high-temperature and high-pressure working fluid is transferred to the heat storage medium through the second heat exchanger 7, and the heated heat storage medium enters the high-temperature tank 13 for storage. Therefore, in this embodiment, the heat in the flue gas is stored after being lifted by the high-temperature heat pump, which can not only realize the decoupling of the gas turbine and the steam turbine 15, but also realize high-temperature energy storage.

[0041] Furthermore, it also includes an electric heater 9, which is connected to the low-temperature tank 11 and the high-temperature tank 13 through a heat storage medium pipeline C2. The low-temperature pump 12 extracts the low-temperature heat storage medium in the low-temperature tank 11, and the low-temperature heat storage medium flows into the electric heater 9. The low-temperature heat storage medium is heated by abandoned electricity or valley electricity. The heated high-temperature heat storage medium flows into the high-temperature tank 13 for energy storage. The stored heat energy can be used to generate electricity and connect to the grid during peak electricity consumption or when needed, or for heating, etc.

[0042] Preferably, the heat storage medium of the energy storage system is molten salt, and the temperature of the molten salt passing through the second heat exchanger 7 is heated from 190°C-200°C to 610°C-650°C.

[0043] Further preferably, it further includes a power generation system and a third heat exchanger 10, the energy storage system is coupled to the power generation system through the third heat exchanger 10 to convert thermal energy into electrical energy, and the high temperature tank 13, the third heat exchanger 10 and the low temperature tank 11 are connected through a heat storage medium pipeline C3;

[0044] The heat storage medium in the high temperature tank 13 is pumped out by the high temperature pump 14 and flows into the heat storage medium side of the third heat exchanger 10 to heat the working fluid of the power generation system flowing through the working fluid side of the third heat exchanger 10. The power generation system generates electricity using the heated working fluid.

[0045] Furthermore, the working medium of the power generation system is water vapor, and the power generation system includes a steam turbine 15 and a second generator 16 coaxially arranged with the steam turbine 15. The third heat exchanger and the steam turbine 15 are connected through a working medium pipeline D1. The water flow in the water supply end is heated into water vapor through the working medium side of the third heat exchanger 10. The water vapor flows into the steam turbine 15 to perform work, and generates electricity through the second generator 16.

[0046] The following describes in detail the operation method of the system of this embodiment, taking molten salt as the heat storage medium, gas as the working fluid of the high-temperature heat pump system, and steam power generation as an example:

[0047] 1. An operation method of a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is operating with flue gas, abandoned power or valley power, and the energy storage system is not releasing heat, the flue gas pipeline A1, the working fluid pipeline B1, the heat storage medium pipeline C1, and the heat storage medium pipeline C2 are opened, the high-temperature heat pump system, the energy storage system and the electric heater 9 are operating, and the power generation system is not operating;

[0048] The high-temperature flue gas of 450℃-550℃ flowing out of the turbine 4 flows through the flue gas side of the first heat exchanger 5, and the heat of the high-temperature flue gas heats the gas on the working medium side of the first heat exchanger 5. The flue gas temperature drops from 450℃-550℃ to about 110℃, flows out from the flue gas side of the first heat exchanger 5, and enters the flue gas outlet pipe;

[0049] The low-temperature and low-pressure gas is heated by the first heat exchanger 5 from 100°C to a high-temperature gas of 440°C-540°C. The high-temperature gas of 440°C-540°C enters the compressor 6 for gas compression to further increase the temperature of the working fluid. The temperature of the high-temperature and high-pressure gas after gas compression by the compressor 6 is 550°C-650°C. Then, the high-temperature and high-pressure gas flowing out of the compressor 6 enters the working fluid side of the second heat exchanger 7, and the heat of the high-temperature and high-pressure working fluid heats the heat storage medium on the heat storage medium side of the second heat exchanger 7. The high-temperature and high-pressure gas drops to a low-temperature and high-pressure gas of about 210°C, and then flows into the expander 8 for gas pressure relief operation, and flows out of the low-temperature and low-pressure gas, and returns to the working fluid side of the first heat exchanger 5 for continuous circulation, repeatedly absorbing the heat of the high-temperature flue gas, and transferring it to the low-temperature molten salt to realize the function of heat transfer;

[0050] The low-temperature molten salt in the low-temperature tank 11 is pumped into the molten salt side of the second heat exchanger 7 and the electric heater 9 through the low-temperature pump 12. The low-temperature molten salt absorbs the heat of the high-temperature and high-pressure gas in the second heat exchanger 7, and the temperature is raised from 190℃-210℃ low-temperature molten salt to 610℃-650℃ high-temperature molten salt, and flows into the high-temperature tank 13 to store heat; the low-temperature molten salt is heated to 610℃-650℃ high-temperature molten salt in the electric heater 9, and flows into the high-temperature tank 13 to store heat.

[0051] When necessary, the heat stored in the high temperature tank 13 can be released and converted into electrical energy or heat supply, and when not needed, the high temperature tank 13 stores heat.

[0052] 2. Further, when the gas turbine system is working with flue gas, abandoned power or valley power, and the energy storage system releases heat, the flue gas pipeline A1, the working fluid pipeline B1 and the heat storage medium pipeline C1, the heat storage medium pipeline C2, and the heat storage medium pipeline C3 are opened, and the high-temperature heat pump system, the electric heater 9, and the power generation system are working.

[0053] The high-temperature flue gas of 450℃-550℃ flowing out of the turbine 4 flows through the flue gas side of the first heat exchanger 5, and the heat of the high-temperature flue gas heats the gas on the working medium side of the first heat exchanger 5. The flue gas temperature drops from 450℃-550℃ to about 110℃, flows out from the flue gas side of the first heat exchanger 5, and enters the flue gas outlet pipe;

[0054] The low-temperature and low-pressure gas is heated by the first heat exchanger 5 from 100°C to a high-temperature gas of 440°C-540°C. The high-temperature gas of 440°C-540°C enters the compressor 6 for gas compression to further increase the temperature of the working fluid. The temperature of the high-temperature and high-pressure gas after gas compression by the compressor 6 is 550°C-650°C. Then, the high-temperature and high-pressure gas flowing out of the compressor 6 enters the working fluid side of the second heat exchanger 7, and the heat of the high-temperature and high-pressure working fluid heats the heat storage medium on the heat storage medium side of the second heat exchanger 7. The high-temperature and high-pressure gas drops to a low-temperature and high-pressure gas of about 210°C, and then flows into the expander 8 for gas pressure relief operation, and flows out of the low-temperature and low-pressure gas, and returns to the working fluid side of the first heat exchanger 5 for continuous circulation, repeatedly absorbing the heat of the high-temperature flue gas, and transferring it to the low-temperature molten salt to realize the function of heat transfer;

[0055] The low-temperature molten salt in the low-temperature tank 11 is pumped into the molten salt side of the second heat exchanger 7 and the electric heater 9 through the low-temperature pump 12. The low-temperature molten salt absorbs the heat of the high-temperature and high-pressure gas in the second heat exchanger 7, and the temperature is increased from 190°C-210°C low-temperature molten salt to 610°C-650°C high-temperature molten salt, and flows into the high-temperature tank 13 to store heat; the low-temperature molten salt is heated to 610°C-650°C high-temperature molten salt in the electric heater 9, and flows into the high-temperature tank 13 to store heat;

[0056] The high-temperature molten salt in the high-temperature tank 13 heats the working fluid in the power generation system through the third heat exchanger 10, and forms low-temperature molten salt of about 200° C. after heat release, and enters the cold molten salt tank;

[0057] The supply water enters the working medium side of the third heat exchanger 10 to absorb heat, forming superheated steam at 600°C and 27MPag, and then enters the steam turbine 15 to drive the second generator 16 to generate electricity and go online.

[0058] 3. An operating method of a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is operating with flue gas, without abandoned power or valley power, and the energy storage system is releasing heat, the flue gas pipeline A1, the working fluid pipeline B1, the heat storage medium pipeline C1, and the heat storage medium pipeline C3 are opened, the high-temperature heat pump system and the power generation system are operating, and the electric heater 9 is not operating.

[0059] The high-temperature flue gas of 450℃-550℃ flowing out of the turbine 4 flows through the flue gas side of the first heat exchanger 5, and the heat of the high-temperature flue gas heats the gas on the working medium side of the first heat exchanger 5. The flue gas temperature drops from 450℃-550℃ to about 110℃, flows out from the flue gas side of the first heat exchanger 5, and enters the flue gas outlet pipe;

[0060] The low-temperature and low-pressure gas is heated by the first heat exchanger 5 from 100°C to a high-temperature gas of 440°C-540°C. The high-temperature gas of 440°C-540°C enters the compressor 6 for gas compression to further increase the temperature of the working fluid. The temperature of the high-temperature and high-pressure gas after gas compression by the compressor 6 is 550°C-650°C. Then, the high-temperature and high-pressure gas flowing out of the compressor 6 enters the working fluid side of the second heat exchanger 7, and the heat of the high-temperature and high-pressure working fluid heats the heat storage medium on the heat storage medium side of the second heat exchanger 7. The high-temperature and high-pressure gas drops to a low-temperature and high-pressure gas of about 210°C, and then flows into the expander 8 for gas pressure relief operation, and flows out of the low-temperature and low-pressure gas, and returns to the working fluid side of the first heat exchanger 5 for continuous circulation, repeatedly absorbing the heat of the high-temperature flue gas, and transferring it to the low-temperature molten salt to realize the function of heat transfer;

[0061] The low-temperature molten salt in the low-temperature tank 11 is pumped into the molten salt side of the second heat exchanger 7 by the low-temperature pump 12. The low-temperature molten salt absorbs the heat of the high-temperature and high-pressure gas in the second heat exchanger 7, and the temperature of the low-temperature molten salt is increased from 190°C-210°C to 610°C-650°C, and flows into the high-temperature tank 13 to store heat;

[0062] The high-temperature molten salt in the high-temperature tank 13 heats the working fluid in the power generation system through the third heat exchanger 10, and forms low-temperature molten salt of about 200° C. after heat release, and enters the cold molten salt tank;

[0063] The supply water enters the working medium side of the third heat exchanger 10 to absorb heat, forming superheated steam at 600°C and 27MPag, and then enters the steam turbine 15 to drive the second generator 16 to generate electricity and go online.

[0064] 4. An operating method of a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is operating with flue gas, without abandoned electricity or valley electricity, and the energy storage system is not releasing heat, the flue gas pipeline A1, the working fluid pipeline B1 and the heat storage medium pipeline C1 are opened, the high-temperature heat pump system is operating, and the electric heater 9 and the power generation system are not operating.

[0065] The high-temperature flue gas of 450℃-550℃ flowing out of the turbine 4 flows through the flue gas side of the first heat exchanger 5, and the heat of the high-temperature flue gas heats the gas on the working medium side of the first heat exchanger 5. The flue gas temperature drops from 450℃-550℃ to about 110℃, flows out from the flue gas side of the first heat exchanger 5, and enters the flue gas outlet pipe;

[0066] The low-temperature and low-pressure gas is heated by the first heat exchanger 5 from 100°C to a high-temperature gas of 440°C-540°C. The high-temperature gas of 440°C-540°C enters the compressor 6 for gas compression to further increase the temperature of the working fluid. The temperature of the high-temperature and high-pressure gas after gas compression by the compressor 6 is 550°C-650°C. Then, the high-temperature and high-pressure gas flowing out of the compressor 6 enters the working fluid side of the second heat exchanger 7, and the heat of the high-temperature and high-pressure working fluid heats the heat storage medium on the heat storage medium side of the second heat exchanger 7. The high-temperature and high-pressure gas drops to a low-temperature and high-pressure gas of about 210°C, and then flows into the expander 8 for gas pressure relief operation, and flows out of the low-temperature and low-pressure gas, and returns to the working fluid side of the first heat exchanger 5 for continuous circulation, repeatedly absorbing the heat of the high-temperature flue gas, and transferring it to the low-temperature molten salt to realize the function of heat transfer;

[0067] The low-temperature molten salt in the low-temperature tank 11 is pumped into the molten salt side of the second heat exchanger 7 by the low-temperature pump 12. The low-temperature molten salt absorbs the heat of the high-temperature and high-pressure gas in the second heat exchanger 7, and the temperature of the low-temperature molten salt is increased from 190℃-210℃ to 610℃-650℃, and flows into the high-temperature tank 13 to store heat.

[0068] 5. An operating method of a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is not working and has no flue gas, has abandoned electricity or valley electricity, and the energy storage system does not release heat, the heat storage medium pipeline C2 is opened, the electric heater 9 is working, and the high-temperature heat pump system and the power generation system are not working.

[0069] The low-temperature molten salt in the low-temperature tank 11 is pumped into the electric heater 9 through the low-temperature pump 12. The 190°C-210°C low-temperature molten salt is heated to 610°C-650°C high-temperature molten salt in the electric heater 9 and flows into the high-temperature tank 13 to store heat.

[0070] 6. An operating method of a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is not working and has no flue gas, there is abandoned electricity or valley electricity, and the energy storage system releases heat, the heat storage medium pipeline C2 and the heat storage medium pipeline C3 are opened, the high-temperature heat pump system is not working, and the electric heater 9 and the power generation system are working.

[0071] The low-temperature molten salt in the low-temperature tank 11 is pumped into the electric heater 9 through the low-temperature pump 12. The 190°C-210°C low-temperature molten salt is heated to 610°C-650°C high-temperature molten salt in the electric heater 9 and flows into the high-temperature tank 13 to store heat.

[0072] The high-temperature molten salt in the high-temperature tank 13 heats the working fluid in the power generation system through the third heat exchanger 10, and forms low-temperature molten salt of about 200° C. after heat release, and enters the cold molten salt tank;

[0073] The supply water enters the working medium side of the third heat exchanger 10 to absorb heat, forming superheated steam at 600°C and 27MPag, and then enters the steam turbine 15 to drive the second generator 16 to generate electricity and go online.

[0074] 7. An operating method of a gas turbine system coupled with a high-temperature heat pump and energy storage, wherein when the gas turbine system is not working and there is no flue gas, no abandoned electricity or valley electricity, and the energy storage system releases heat, the heat storage medium pipeline C3 is opened, the high-temperature heat pump system and the electric heater 9 are not working, and the power generation system is working.

[0075] The high-temperature molten salt in the high-temperature tank 13 heats the working fluid in the power generation system through the third heat exchanger 10, and forms low-temperature molten salt of about 200° C. after heat release, and enters the cold molten salt tank;

[0076] The supply water enters the working medium side of the third heat exchanger 10 to absorb heat, forming superheated steam at 600°C and 27MPag, and then enters the steam turbine 15 to drive the second generator 16 to generate electricity and go online.

[0077] Based on the mutual constraints between gas turbines and steam turbines, the present invention proposes to decouple gas turbines from steam turbines by coupling high-temperature heat pumps with energy storage systems, so as to reduce the exhaust temperature of gas turbines and improve the steam parameters of steam turbines. At the same time, coupling electric heaters can also help to absorb the abandoned electricity of new energy sources or help the power grid to reduce peak loads and fill valleys, thereby improving system flexibility and overall benefits.

[0078] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A gas turbine system coupled with a high temperature heat pump and energy storage, characterized in that: include: Gas turbine system, high temperature heat pump system, energy storage system; The gas turbine system includes a first generator, a compressor, a combustion chamber, a turbine and a flue gas duct A1, and the first heat exchanger is arranged on the flue gas duct A1; air flows through the compressor, the combustion chamber and the turbine, and the flue gas flowing out of the turbine flows through the flue gas duct A1 and the flue gas side of the first heat exchanger; The high-temperature heat pump system includes a first heat exchanger, a second heat exchanger, an expander, and a compressor. The expander, the first heat exchanger, the compressor, and the second heat exchanger are connected through a working medium pipeline B1. The working medium of the high-temperature heat pump flows through the working medium side of the first heat exchanger, the compressor, the working medium side of the second heat exchanger, and the expander, and returns to the working medium side of the first heat exchanger. The energy storage system includes a high-temperature tank and a low-temperature tank. The high-temperature tank, the second heat exchanger and the low-temperature tank are connected via a heat storage medium pipeline C1. The heat storage medium in the low-temperature tank flows through the heat storage medium side of the second heat exchanger and flows into the high-temperature tank for storage.

2. The gas turbine system coupled with a high temperature heat pump and energy storage according to claim 1, characterized in that: It also includes an electric heater, which is connected to the low-temperature tank and the high-temperature tank through a heat storage medium pipeline C2. The heat storage medium in the low-temperature tank flows into the electric heater for heating and then flows into the high-temperature tank.

3. The gas turbine system coupled with a high temperature heat pump and energy storage according to claim 1, characterized in that: The heat storage medium of the energy storage system is molten salt, and the temperature of the molten salt is heated from 190°C-200°C to 610°C-650°C after passing through the second heat exchanger.

4. The gas turbine system coupled with a high temperature heat pump and energy storage according to claim 1, characterized in that: It also includes a power generation system and a third heat exchanger, wherein the high temperature tank, the third heat exchanger and the low temperature tank are connected via a heat storage medium pipeline C3; The heat storage medium of the energy storage system flows through the heat storage medium side of the third heat exchanger for heat exchange, and the working medium side of the third heat exchanger flows through the working medium of the power generation system, and the power generation system generates electricity using the heated working medium.

5. The gas turbine system coupled with a high temperature heat pump and energy storage according to claim 4, characterized in that: The working medium of the power generation system is water vapor. The power generation system includes a steam turbine and a second generator coaxially arranged with the steam turbine. The third heat exchanger and the steam turbine are connected through a working medium pipeline D1. The water flow in the water supply end is heated into water vapor through the working medium side of the third heat exchanger. The water vapor flows into the steam turbine to perform work and generates electricity through the second generator.

6. The gas turbine system coupled with a high temperature heat pump and energy storage according to claim 1, characterized in that: The working medium of the high-temperature heat pump is gas, and the temperature range of the gas after heat exchange through the first heat exchanger is 440°C-540°C, and the temperature range of the gas flowing out of the first heat exchanger and flowing into the compressor after compression is 550°C-650°C.

7. A method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage as described in any one of 1 to 6, characterized in that: When the gas turbine system is working and there is flue gas, the flue gas pipeline A1, the working medium pipeline B1 and the heat storage medium pipeline C1 are opened, and the high-temperature heat pump system and the energy storage system are working: The air flows through the compressor, the combustion chamber, and the turbine, and the flue gas flowing out of the turbine flows through the flue gas duct A1 and the flue gas side of the first heat exchanger; The working fluid of the high-temperature heat pump flows through the working fluid side of the first heat exchanger, the compressor, the working fluid side of the second heat exchanger and the expander, and returns to the working fluid side of the first heat exchanger; The heat storage medium in the low-temperature tank flows through the heat storage medium side of the second heat exchanger and flows into the high-temperature tank for storage.

8. The method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage according to claim 7, characterized in that: When there is power abandonment or valley power, the heat storage medium pipeline C2 is opened, and the electric heater works to heat the low-temperature heat storage medium, and the heated high-temperature heat storage medium is stored in the energy storage system.

9. The method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage according to claim 7, characterized in that: The heat storage medium pipeline C3 is opened, the power generation system and the third heat exchanger are working, the high-temperature heat storage medium in the heat storage system heats the working fluid in the power generation system through the third heat exchanger, and the power generation system converts the heat of the high-temperature working fluid into electrical energy.

10. A method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage as described in any one of 1 to 6, characterized in that: When the gas turbine system is not working and there is no flue gas, the flue gas pipeline A1, the working medium pipeline B1 and the heat storage medium pipeline C1 are closed, the high-temperature heat pump system is not working, and the energy storage system releases heat.

11. The method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage according to claim 10, characterized in that: During peak power or when necessary, the heat storage medium pipeline C3 is opened, the power generation system and the third heat exchanger work, the high-temperature heat storage medium in the heat storage system heats the working fluid in the power generation system through the third heat exchanger, and the power generation system converts the heat of the high-temperature working fluid into electrical energy.

12. A method for operating a gas turbine system coupled with a high-temperature heat pump and energy storage as described in any one of items 2 to 6, characterized in that: When the gas turbine system is not working and there is no flue gas, the flue gas pipeline A1, the working fluid pipeline B1 and the heat storage medium pipeline C1 are closed. When there is power abandonment or valley power, the heat storage medium pipeline C2 is opened, and the electric heater works to heat the heat storage medium, and the heated heat storage medium is stored in the energy storage system.

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