A multi-mode energy supply system based on the coupled drive of a steam turbine and an electric motor

Abstract

The present invention discloses a multi-mode energy supply system based on the coupled drive of a steam turbine and an electric motor, which includes a coupled drive unit. The coupled drive unit includes a steam turbine, a motor / generator integrated machine, and a multi-stage compressor. The steam turbine and the motor / generator integrated machine are connected to the multi-stage compressor through a clutch mechanism to form a selectively drivable power transmission path; an energy conversion subsystem, which is connected to the coupled drive unit and is used to convert mechanical energy into compressed air, thermal energy, and cold energy; an energy supply pipe network, which is connected to the energy conversion subsystem and is used to transport compressed air, thermal energy, and cold energy to energy demand users; an energy management and control system, which is connected to the coupled drive unit and the energy conversion subsystem and is used to control the engagement state of the clutch mechanism according to the energy supply and demand situation, adjust the operation modes of the steam turbine and the motor / generator integrated machine, and achieve multi-mode energy supply. The advantages are that it realizes multi-energy complementarity, flexible adjustment, and efficient utilization of various types of energy.

Description

Technical Field

[0001] The present invention relates to the technical field of energy supply, and particularly to a multi-mode energy supply system based on the coupled drive of a steam turbine and an electric motor. Background Art

[0002] With the diversified development of energy demand and the continuous improvement of environmental protection requirements, the efficient utilization and flexible supply of energy systems have become increasingly important. In industrial production and urban operation, various energy forms such as electricity, heat, and cold energy are required, as well as industrial gases such as compressed air. Especially in large enterprises such as chemical plants, thermal power plants, and pharmaceutical enterprises, these demands often exist simultaneously and are interrelated. Therefore, it is necessary to establish a system that can integrate various energy forms, achieve efficient conversion and flexible regulation, which can not only improve energy utilization efficiency, reduce the environmental load, but also reduce the comprehensive operating cost of enterprises and achieve the improvement of economic and environmental benefits.

[0003] Existing energy systems mainly adopt single combined heat and power generation or combined cooling, heat and power generation methods. Among them, single combined heat and power generation systems usually use steam turbines as the main equipment, while combined cooling, heat and power generation systems mostly use gas turbines or internal combustion engines as prime movers. For compressed air supply, the traditional mode is that each gas-using enterprise supplies independently and dispersedly, using air compressors of different types and brands, resulting in different performances, reliabilities, and maintenance costs. Although the centralized gas supply mode can effectively reduce the costs of gas-using enterprises, the electricity costs of high-power compressors vary significantly during peak and valley electricity price periods. In addition, many large enterprises often generate surplus steam during the production process, especially in combined heat and power generation thermal power plants, the phenomenon of excessive steam production in summer is relatively common.

[0004] In summary, the existing technologies have the following deficiencies:

[0005] 1. Existing systems generally adopt a single drive source and cannot achieve the comprehensive utilization of various energy forms, which directly leads to the lack of flexibility in the energy conversion path, making it difficult for the system to adjust in a timely manner according to changes in user needs, thus significantly reducing the energy utilization rate;

[0006] 2. Due to the single energy conversion path, the operating mode of the system is also correspondingly fixed and cannot adapt to seasonal changes and load fluctuations, further restricting the possibility of the system to operate efficiently with multiple functions. The low energy utilization efficiency is also reflected in the treatment of surplus steam. Existing systems are difficult to effectively utilize this surplus energy, and at the same time, they lack effective means to absorb volatile renewable energy, resulting in a serious shortage of the power grid's peak shaving and valley filling capabilities;

[0007] Based on the above problems, it is urgent to develop a multi-mode energy supply system that can comprehensively utilize various energies, flexibly adjust different load demands, and adapt to the fluctuating characteristics of renewable energy, so as to fundamentally solve the limitations of the existing technologies. Summary of the invention

[0008] The purpose of the present invention is to provide a multi-mode energy supply system based on the coupling drive of a steam turbine and a motor, which can achieve multi-energy complementarity, flexible adjustment, and efficient utilization of various energy sources.

[0009] To achieve the above object, the present invention provides the following technical solution: a multi-mode energy supply system based on steam turbine and motor coupling drive, comprising:

[0010] A coupled drive unit, the coupled drive unit comprising a steam turbine, a motor / generator and a multi-stage compressor, the steam turbine and the motor / generator being connected to the multi-stage compressor via a clutch mechanism to form a selectively drivable power transmission path;

[0011] An energy conversion subsystem connected to the coupling drive unit, the energy conversion subsystem is used to convert mechanical energy into compressed air, heat energy and cold energy;

[0012] An energy supply network, connected to the energy conversion subsystem, for delivering compressed air, heat energy and cold energy to energy demanding users;

[0013] An energy management control system is connected to the coupled drive unit and the energy conversion subsystem, and is used to control the engagement state of the clutch mechanism according to the energy supply and demand conditions, adjust the operation mode of the steam turbine and the motor / generator, and realize multi-mode energy supply.

[0014] Preferably, the clutch mechanism includes a first clutch and a second clutch, and the multi-stage compressor includes a first low-pressure compressor, a second low-pressure compressor and a high-pressure compressor; wherein, the steam turbine is connected to a steam input network for receiving steam energy, and the motor / generator is connected to a power grid for receiving or outputting electric energy, the steam turbine is connected to the motor / generator through the first clutch, and the other end of the motor / generator is connected to the first low-pressure compressor, and the other end of the first low-pressure compressor is connected to the second low-pressure compressor through the second clutch, and the other end of the second low-pressure compressor is connected to the high-pressure compressor; by controlling the engagement state of the first clutch and the second clutch, a variable combination drive of the steam turbine and the motor / generator on the multi-stage compressor is achieved.

[0015] Preferably, the energy conversion subsystem comprises:

[0016] A compressed air purification system, connected to the output end of the multi-stage compressor, for cooling, drying and filtering the compressed air;

[0017] A compressed air energy storage power generation system, connected to the output end of the multi-stage compressor, for storing high-pressure compressed air and expanding and generating electricity when needed;

[0018] A compressed heat recovery system, connected to the output end of the multi-stage compressor, for recovering the heat generated during the compression process;

[0019] A first heat storage device, connected to the compressed air energy storage power generation system, for storing the thermal energy from the compressed air energy storage power generation system;

[0020] A second heat storage device, connected to the compressed heat recovery system, for storing the thermal energy from the compressed heat recovery system;

[0021] A cold storage device, connected to the compressed air energy storage power generation system, for storing and distributing cold energy.

[0022] Preferably, the compressed air purification system includes a first heat exchanger, an air dryer, a precision filter, and a gas storage tank; wherein, the intake end of the first heat exchanger is connected to the output end of the first low-pressure compressor, the outlet end of the first heat exchanger is connected to the intake end of the air dryer, the outlet end of the air dryer is connected to the intake end of the precision filter, the outlet end of the precision filter is connected to the intake end of the gas storage tank, and the outlet end of the gas storage tank is connected to the compressed air transmission pipeline in the energy supply pipe network.

[0023] Preferably, the compressed air energy storage power generation system includes a second heat exchanger, a third heat exchanger, a gas storage device, a first heat accumulator, a fourth heat exchanger, a fifth heat exchanger, a high-pressure expander, a low-pressure expander and a generator; wherein, the air inlet end of the second heat exchanger is connected to the air outlet end of the second low-pressure compressor, the air outlet end of the second heat exchanger is connected to the air inlet end of the high-pressure compressor, the air outlet end of the high-pressure compressor is connected to the air inlet end of the third heat exchanger, the air outlet end of the third heat exchanger is connected to the air inlet end of the gas storage device, the air outlet end of the gas storage device is connected to the air inlet end of the fourth heat exchanger, the air outlet end of the fourth heat exchanger is connected to the air inlet end of the high-pressure expander, the air outlet end of the high-pressure expander is connected to the air inlet end of the fifth heat exchanger, the air outlet end of the fifth heat exchanger is connected to the air inlet end of the low-pressure expander, the air outlet end of the low-pressure expander is connected to the cold storage device, the cold storage device is connected to the cold air conveying pipeline in the energy supply pipe network, and the output shafts of the high-pressure expander and the low-pressure expander are connected to the input shaft of the generator; the heat medium inlet end of the first heat accumulator is respectively connected to the heat medium outlet ends of the second heat exchanger and the third heat exchanger, the heat medium outlet end of the first heat accumulator is respectively connected to the heat medium inlet ends of the fourth heat exchanger and the fifth heat exchanger, the refrigerant inlet end of the first heat accumulator is used to receive cold water, the refrigerant outlet end of the first heat accumulator is connected to the refrigerant inlet end of the second heat exchanger, the heat medium outlet ends of the fourth heat exchanger and the fifth heat exchanger are connected to the first heat storage device, and the first heat storage device is used to store hot water and is connected to the hot water conveying pipeline in the energy supply pipe network.

[0024] Preferably, the compressed heat recovery system includes a second heat accumulator and a second heat storage device; wherein, the heat medium inlet end of the second heat accumulator is used to receive hot heat transfer oil and is connected to the heat medium outlet end of the first heat exchanger, the heat medium outlet end of the second heat accumulator is used to output hot water and is connected to the second heat storage device, the refrigerant inlet end of the second heat accumulator is used to receive cold water, the refrigerant outlet end of the second heat accumulator is used to output cold heat transfer oil and is connected to the refrigerant inlet end of the first heat exchanger; the second heat storage device is used to store hot water and is connected to the hot water conveying pipeline in the energy supply pipe network.

[0025] Preferably, the energy management and control system controls the engagement state of the clutch mechanism and the operation combination of the multi-stage compressor according to the steam supply condition and the grid power consumption condition, so that the system can achieve multiple operation modes under different conditions, and the multiple operation modes include: no steam supply mode, partial steam supply mode, steam sufficient grid peak mode and steam sufficient grid valley mode.

[0026] Preferably, in the no-steam supply mode, the energy management and control system controls the motor / generator to consume the electric energy of the power grid to generate driving force, driving the first low-pressure compressor to operate. The compressed air generated is supplied to the energy demand users through the energy supply pipe network after passing through the compressed air purification system. In the partial-steam supply mode, the energy management and control system controls the steam turbine and the motor / generator to operate in a coupled manner, respectively consuming the thermal energy of steam and the electric energy of the power grid to generate driving force, driving the first low-pressure compressor to operate. The compressed air generated is supplied to the energy demand users through the energy supply pipe network after passing through the compressed air purification system.

[0027] Preferably, in the peak mode of the power grid with sufficient steam, the energy management and control system controls the steam turbine to consume the thermal energy of steam to generate driving force, driving the first low-pressure compressor to operate. The compressed air generated is supplied to the energy demand users through the energy supply pipe network after passing through the compressed air purification system. At the same time, the driving force generated by the steam turbine also causes the motor / generator to operate as a generator, outputting electric energy to the power grid. In the off-peak mode of the power grid with sufficient steam, the energy management and control system controls the steam turbine and the motor / generator to operate in a coupled manner, respectively consuming the thermal energy of steam and the electric energy of the power grid to generate driving force, driving the first low-pressure compressor, the second low-pressure compressor, and the high-pressure compressor to operate simultaneously. Among them, the compressed air generated by the first low-pressure compressor is supplied to the energy demand users through the energy supply pipe network after passing through the compressed air purification system. The compressed air generated by the second low-pressure compressor and the high-pressure compressor is transported to the compressed air energy storage power generation system for energy storage. During the peak electricity consumption period, the compressed air energy storage power generation system releases the stored compressed air, driving the high-pressure expander and the low-pressure expander to operate, driving the generator to generate electricity, outputting the electric energy to the power grid, and providing cold energy and thermal energy to the energy demand users through the energy supply pipe network.

[0028] Compared with the prior art, the advantages of the present invention are as follows: Through the coupled drive of the steam turbine and the motor / generator integrated machine, the system realizes a technical solution for multi-energy collaborative supply. The core lies in the flexible connection of the steam turbine, the motor / generator integrated machine, and the multi-stage compressor by means of a clutch mechanism, forming a power transmission path that can be selectively switched according to the actual energy situation. Under different working conditions, the system can intelligently select a single power source drive or a combined drive mode: when there is sufficient steam, the steam turbine is preferentially used for driving; when steam is lacking, it can be switched to motor drive, or energy complementation and energy storage can be achieved during peak-valley electricity price periods; the energy conversion subsystem efficiently converts mechanical energy into compressed air, heat energy, and cold energy, and distributes various types of energy to users through the energy supply pipeline network; the energy management and control system monitors the energy supply and demand status in real time, automatically adjusts the engagement state of the clutch mechanism and the operating parameters of each device, and realizes the intelligent operation of the system.

[0029] This design not only greatly improves the energy utilization efficiency, effectively responds to energy supply fluctuations, but also meets the complex demands of industrial enterprises for multiple energies through the flexible conversion and complementation of multiple energy forms. At the same time, it has functions such as peak shaving and valley filling of the power grid and utilization of surplus steam, which reduces the operating cost while improving the reliability and environmental friendliness of the system. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0031] Figure 1 It is a schematic diagram of the working process of the present invention;

[0032] Figure 2 It is a schematic diagram of the pipeline of the present invention;

[0033] In the figure, 1. Steam turbine; 2. First clutch; 3. Motor / generator integrated machine; 4. First low-pressure compressor; 5. Second clutch; 6. Second low-pressure compressor; 7. High-pressure compressor; 8. First heat exchanger; 9. Air dryer; 10. Precision filter; 11. Gas storage tank; 12. Second heat exchanger; 13. Third heat exchanger; 14. Energy storage device; 15. Fourth heat exchanger; 16. Fifth heat exchanger; 17. High-pressure expander; 18. Low-pressure expander; 19. Generator; 20. First regenerator; 21. First heat storage device; 22. Cold storage device; 23. Second regenerator; 24. Second heat storage device. Detailed Embodiments

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0035] Embodiment 1: As Figure 1 - Figure 2 shown, a multi-mode energy supply system based on the coupled drive of a steam turbine and an electric motor includes

[0036] a coupled drive unit, which includes a steam turbine 1, an electric motor / generator integrated machine 3, and a multi-stage compressor. The steam turbine 1 and the electric motor / generator integrated machine 3 are connected to the multi-stage compressor through a clutch mechanism to form a selectively drivable power transmission path;

[0037] an energy conversion subsystem, which is connected to the coupled drive unit and is used to convert mechanical energy into compressed air, heat energy, and cold energy;

[0038] an energy supply pipeline network, which is connected to the energy conversion subsystem and is used to transport compressed air, heat energy, and cold energy to energy demand users;

[0039] an energy management and control system, which is connected to the coupled drive unit and the energy conversion subsystem and is used to control the engagement state of the clutch mechanism according to the energy supply and demand situation, adjust the operation modes of the steam turbine 1 and the electric motor / generator integrated machine 3, and realize multi-mode energy supply.

[0040] Embodiment 2: As Figure 1 - Figure 2 shown, different from Embodiment 1, the clutch mechanism includes a first clutch 2 and a second clutch 5, and the multi-stage compressor includes a first low-pressure compressor 4, a second low-pressure compressor 6, and a high-pressure compressor 7; wherein, the steam turbine 1 is connected to the steam input network to receive steam energy, the electric motor / generator integrated machine 3 is connected to the power grid to receive or output electric energy, the steam turbine 1 is connected to the electric motor / generator integrated machine 3 through the first clutch 2, the other end of the electric motor / generator integrated machine 3 is connected to the first low-pressure compressor 4, the other end of the first low-pressure compressor 4 is connected to the second low-pressure compressor 6 through the second clutch 5, and the other end of the second low-pressure compressor 6 is connected to the high-pressure compressor 7; by controlling the engagement states of the first clutch 2 and the second clutch 5, variable combined drive of the steam turbine 1 and the electric motor / generator integrated machine 3 on the multi-stage compressor is realized.

[0041] In this structure, the first clutch 2 connects the steam turbine 1 and the motor / generator integrated unit 3, while the second clutch 5 connects the first low-pressure compressor 4 and the second low-pressure compressor 6 in series, forming a complete power transmission chain. The steam turbine 1 obtains thermal energy through the steam input network, and the motor / generator integrated unit 3 is connected to the power grid, which can not only consume electrical energy to drive the system but also output electrical energy to the power grid under appropriate conditions. The advantage of this structural design lies in the diversity of its operating modes: by controlling the engagement state of the first clutch 2, the system can achieve operating modes of single drive by the steam turbine 1, single drive by the motor / generator integrated unit 3, or combined drive by both; by controlling the engagement state of the second clutch 5, the system can flexibly adjust the working combination of the compressor unit to achieve flexible switching between first-stage, second-stage, or third-stage compression.

[0042] When the energy supply fluctuates, this structure can achieve a smooth transition to ensure the continuous and stable operation of the system; when the load demand changes, the compressor combination can be adjusted to precisely match the production capacity and demand, avoiding energy waste; during the peak and valley periods of the power grid, the system can intelligently switch the power source to achieve the optimal energy economy. This highly flexible variable combination drive mechanism enables the system to always maintain the best energy efficiency ratio according to different external conditions and operating requirements, while improving the reliability and adaptability of the system.

[0043] In this embodiment, the energy conversion subsystem includes

[0044] a compressed air purification system, connected to the output end of the multi-stage compressor, for cooling, drying, and filtering the compressed air;

[0045] a compressed air energy storage power generation system, connected to the output end of the multi-stage compressor, for storing high-pressure compressed air and expanding and generating electricity when needed;

[0046] a compressed heat recovery system, connected to the output end of the multi-stage compressor, for recovering the heat generated during the compression process;

[0047] a first heat storage device 21, connected to the compressed air energy storage power generation system, for storing the thermal energy from the compressed air energy storage power generation system;

[0048] a second heat storage device 24, connected to the compressed heat recovery system, for storing the thermal energy from the compressed heat recovery system;

[0049] a cold storage device 22, connected to the compressed air energy storage power generation system, for storing and distributing cold energy.

[0050] Through multiple energy recovery and conversion, the energy conversion subsystem achieves efficient utilization and flexible supply of energy. The system is organically composed of three major functional modules and three energy storage devices, forming a complete energy conversion and storage network. The compressed air purification system cools, dries, and filters the compressed air generated by the multi-stage compressor to ensure the supply of high-quality compressed air to users; the compressed air energy storage power generation system stores the excess compressed air and converts it into electrical energy through expansion power generation during peak electricity demand periods, achieving the function of peak shaving and valley filling; the compressed heat recovery system specifically recovers the large amount of heat generated during the compression process, avoiding energy loss in traditional systems. The first heat storage device 21 recovers and stores the heat energy in the compressed air energy storage power generation system, the second heat storage device 24 recovers and stores the heat energy in the compressed heat recovery system, and the cold storage device 22 utilizes the cold energy generated when the compressed air expands. These three energy storage devices enable the system to achieve the temporal and spatial transfer of heat energy and cold energy, meeting the diverse energy demands of different users at different times.

[0051] This structure not only significantly improves the overall energy utilization efficiency of the system, reduces energy waste, but also reduces the system operation cost and enhances the reliability and flexibility of energy supply through complementary conversion and cascade utilization of multiple energy forms.

[0052] In this embodiment, the compressed air purification system includes a first heat exchanger 8, an air dryer 9, a precision filter 10, and a gas storage tank 11; among them, the air inlet end of the first heat exchanger 8 is connected to the output end of the first low-pressure compressor 4, the air outlet end of the first heat exchanger 8 is connected to the air inlet end of the air dryer 9, the air outlet end of the air dryer 9 is connected to the air inlet end of the precision filter 10, the air outlet end of the precision filter 10 is connected to the air inlet end of the gas storage tank 11, and the air outlet end of the gas storage tank 11 is connected to the compressed air transmission pipeline in the energy supply network.

[0053] This system consists of four major modules: a first heat exchanger 8, an air dryer 9, a precision filter 10, and a gas storage tank 11, forming a complete compressed air treatment process. The working principle is as follows: The high-temperature compressed air output by the first low-pressure compressor 4 first enters the first heat exchanger 8 for cooling, effectively reducing the air temperature and initially condensing part of the moisture. The cooled compressed air then enters the air dryer 9, where the moisture in the air is further removed through adsorption or refrigeration, significantly reducing the dew point of the compressed air. Next, the dried compressed air enters the precision filter 10 to filter out the tiny particulate matter, oil mist, and other impurities in the air, ensuring that the cleanliness of the compressed air meets the user requirements. Finally, the comprehensively purified compressed air enters the gas storage tank 11, where the pressure is stabilized and the pulsation is eliminated, and it also serves as the compressed air buffer storage device of the system.

[0054] The outlet end of the gas storage tank 11 is connected to the compressed air transmission pipeline in the energy supply pipeline network to provide stable, clean, and dry compressed air for each end-user. This design not only ensures the quality of the compressed air, avoiding damage to user equipment caused by moisture, oil stains, and impurities, but also, through the buffering effect of the gas storage tank 11, reduces the frequent start and stop of the compressor, extends the equipment life, and at the same time improves the gas supply reliability and stability of the system, meeting the strict requirements of modern industry for high-quality compressed air.

[0055] Embodiment Three: As Figure 1 - Figure 2 shown, different from Embodiment Two, the compressed air energy storage power generation system includes a second heat exchanger 12, a third heat exchanger 13, a gas storage device 14, a first heat accumulator 20, a fourth heat exchanger 15, a fifth heat exchanger 16, a high-pressure expander 17, a low-pressure expander 18, and a generator 19; wherein, the inlet end of the second heat exchanger 12 is connected to the outlet end of the second low-pressure compressor 6, the outlet end of the second heat exchanger 12 is connected to the inlet end of the high-pressure compressor 7, the outlet end of the high-pressure compressor 7 is connected to the inlet end of the third heat exchanger 13, the outlet end of the third heat exchanger 13 is connected to the inlet end of the gas storage device 14, the outlet end of the gas storage device 14 is connected to the inlet end of the fourth heat exchanger 15, the outlet end of the fourth heat exchanger 15 is connected to the inlet end of the high-pressure expander 17, the outlet end of the high-pressure expander 17 is connected to the inlet end of the fifth heat exchanger 16, the outlet end of the fifth heat exchanger 16 is connected to the inlet end of the low-pressure expander 18, the outlet end of the low-pressure expander 18 is connected to the cold storage device 22, the cold storage device 22 is connected to the cold air transmission pipeline in the energy supply pipeline network, and the output shafts of the high-pressure expander 17 and the low-pressure expander 18 are connected to the input shaft of the generator 19; the heat medium inlet end of the first heat accumulator 20 is respectively connected to the heat medium outlet ends of the second heat exchanger 12 and the third heat exchanger 13, the heat medium outlet end of the first heat accumulator 20 is respectively connected to the heat medium inlet ends of the fourth heat exchanger 15 and the fifth heat exchanger 16, the refrigerant inlet end of the first heat accumulator 20 is used to receive cold water, the refrigerant outlet end of the first heat accumulator 20 is connected to the refrigerant inlet end of the second heat exchanger 12, the heat medium outlet ends of the fourth heat exchanger 15 and the fifth heat exchanger 16 are connected to the first heat storage device 21, and the first heat storage device 21 is used to store hot water and is connected to the hot water transmission pipeline in the energy supply pipeline network.

[0056] During the energy storage stage of the system, the compressed air output by the second low-pressure compressor 6 is first cooled by the second heat exchanger 12 and then enters the high-pressure compressor 7 for further pressure boosting. Subsequently, it is cooled again by the third heat exchanger 13 and finally stored in the gas storage device 14. A large amount of compression heat generated during this process is not wasted, but is efficiently recovered and stored by the first heat accumulator 20 through the second heat exchanger 12 and the third heat exchanger 13. During the power generation stage, the high-pressure air released from the gas storage device 14 first enters the fourth heat exchanger 15 to be heated, and then drives the high-pressure expander 17 to do work. After the expanded air is heated again by the fifth heat exchanger 16, it enters the low-pressure expander 18 to continue doing work. The two-stage expanders jointly drive the generator 19 to generate electric energy. At this time, the first heat accumulator 20 releases the heat energy stored previously to the fourth heat exchanger 15 and the fifth heat exchanger 16, significantly improving the air expansion power and system efficiency.

[0057] The advantages of this system also lie in its multi-energy output capacity: in addition to delivering electric energy to the power grid, the cold air discharged from the low-pressure expander 18 is collected by the cold storage device 22 and supplied to users through the cold air delivery pipeline. At the same time, the hot water generated by the fourth heat exchanger 15 and the fifth heat exchanger 16 provides heat energy to users through the first heat storage device 21 and the hot water delivery pipeline. This integrated design not only improves the comprehensive energy utilization of the system, far exceeding that of traditional compressed air energy storage systems, but also realizes multi-functional capabilities through multi-stage energy recovery and multi-form energy conversion, meeting the diversified needs of industrial users for compressed air, electric energy, heat energy, and cold energy.

[0058] In this embodiment, the compression heat recovery system includes a second heat accumulator 23 and a second heat storage device 24. Among them, the heat medium inlet end of the second heat accumulator 23 is used to receive hot heat transfer oil and is connected to the heat medium outlet end of the first heat exchanger 8. The heat medium outlet end of the second heat accumulator 23 is used to output hot water and is connected to the second heat storage device 24. The refrigerant inlet end of the second heat accumulator 23 is used to receive cold water, and the refrigerant outlet end of the second heat accumulator 23 is used to output cold heat transfer oil and is connected to the refrigerant inlet end of the first heat exchanger 8. The second heat storage device 24 is used to store hot water and is connected to the hot water delivery pipeline in the energy supply pipeline network.

[0059] The system mainly consists of a second heat accumulator 23 and a second heat storage device 24, forming a closed-loop thermal energy recovery network. The working principle is as follows: When the first low-pressure compressor 4 operates, the high-temperature compressed air generated enters the first heat exchanger 8. The thermal energy is transferred to the heat medium inlet end of the second heat accumulator 23 through a heat transfer medium (thermal conductive oil). At the same time, the cold medium inlet end of the second heat accumulator 23 receives cold water, absorbs the heat in the thermal conductive oil through efficient heat exchange and converts it into hot water, which is output to the second heat storage device 24 for storage. The cooled conductive oil (cold conductive oil) then returns from the cold medium outlet end of the second heat accumulator 23 to the cold medium inlet end of the first heat exchanger 8 to complete the cycle. The second heat storage device 24 not only stores hot water but also provides a stable thermal energy supply to users through the hot water delivery pipeline in the energy supply pipe network.

[0060] In this embodiment, the energy management control system controls the engagement state of the clutch mechanism and the operation combination of the multi-stage compressor according to the steam supply situation and the grid power consumption situation, enabling the system to achieve multiple operation modes under different conditions. The multiple operation modes include: no steam supply mode, partial steam supply mode, steam-sufficient grid peak mode, and steam-sufficient grid valley mode.

[0061] As the control center of the entire multi-mode energy supply system, the energy management control system realizes intelligent operation regulation based on changes in external conditions. By real-time monitoring of the two key parameters of the steam supply situation and the grid power consumption situation, the system controls the engagement state of the clutch mechanism and the operation combination of the multi-stage compressor, enabling the entire system to flexibly switch between four operation modes.

[0062] In the no steam supply mode, the system automatically cuts off the connection of the steam turbine 1 and switches to be driven solely by the motor / generator integrated unit 3 to ensure the basic supply of compressed air when steam resources are scarce. When the steam supply partially resumes but is not yet sufficient, the system starts the partial steam supply mode, and the steam turbine 1 and the motor / generator integrated unit 3 work together to form a complementary drive to balance the energy usage cost and supply stability. When the steam supply is sufficient and the grid is in the peak power consumption period, the system switches to the steam-sufficient grid peak mode. At this time, the steam turbine 1 not only drives the compressor to operate but also drives the motor / generator integrated unit 3 to work in reverse to generate electricity and transmit the electric energy to the grid, effectively alleviating the peak load of the grid. When the steam supply is sufficient and the grid is in the low power consumption period, the system adopts the steam-sufficient grid valley mode, combines the power of the steam turbine 1 and the motor / generator integrated unit 3, and simultaneously drives the multi-stage compressor to operate, converting cheap electricity and surplus steam into compressed air energy for storage, realizing the time transfer of energy. This intelligent control strategy based on multiple parameters and multiple modes not only significantly improves the energy utilization efficiency and economy of the system but also enhances the system's ability to adapt to external energy fluctuations.

[0063] In this embodiment, in the no-steam supply mode, the energy management and control system controls the motor / generator unit 3 to consume the electric energy of the power grid to generate a driving force, driving the first low-pressure compressor 4 to operate. The compressed air generated is purified by the compressed air purification system and then supplied to the energy demand users through the energy supply pipeline network. In the partial-steam supply mode, the energy management and control system controls the steam turbine 1 and the motor / generator unit 3 to work in a coupled manner, consuming the thermal energy of the steam and the electric energy of the power grid respectively to generate a driving force, driving the first low-pressure compressor 4 to operate. The compressed air generated is purified by the compressed air purification system and then supplied to the energy demand users through the energy supply pipeline network.

[0064] Through the switching and coordinated driving of the power sources, this multi-mode energy supply system realizes the flexibility and high efficiency of energy supply. In the no-steam supply mode, the energy management and control system disengages the first clutch 2, disconnecting the steam turbine 1 from the power transmission chain. At this time, the motor / generator unit 3 serves as an independent power source, consuming the electric energy of the power grid to drive the first low-pressure compressor 4 to operate. After being cooled by the first heat exchanger 8, the compressed air passes through the air dryer 9, the precision filter 10, and the gas storage tank 11 in sequence to complete the purification and pressure stabilization processes, and finally provides clean compressed air for users through the energy supply pipeline network. This mode ensures that the basic gas supply demand can still be maintained in case of steam interruption, avoiding production interruption, but its energy efficiency is limited by single electric drive.

[0065] In the partial-steam supply mode, the system realizes the power coupling between the steam turbine 1 and the motor by engaging the first clutch 2: the steam turbine 1 uses the thermal energy of the steam to drive the main shaft, and the motor / generator unit 3 supplements electric energy according to the real-time load demand. The two work together to drive the first low-pressure compressor 4. At this time, the thermal energy of the steam and the electric energy of the power grid are dynamically distributed as needed. It can not only use low-cost steam to reduce energy consumption but also make up for the steam power fluctuation through motor regulation to ensure stable compressor output. The compressed air further recovers thermal energy in the purification system. The second regenerator 23 exchanges heat between the hot heat transfer oil derived from the first heat exchanger 8 and cold water to generate hot water, which is stored in the second heat storage device 24 to realize waste heat utilization.

[0066] This hybrid drive mode not only improves the system energy efficiency but also can quickly respond to load changes by dynamically adjusting the power ratio. While ensuring the gas supply quality, it significantly reduces the dependence on a single energy source and enhances the system's anti-risk ability. The smooth switching between the two modes relies on the precise control of the clutch mechanism, combined with the multi-stage energy recovery network of the energy conversion subsystem, enabling the system to always complete energy conversion and supply with optimal economy when the steam supply is unstable or the power grid electricity price fluctuates.

[0067] In this embodiment, in the peak mode of the power grid with sufficient steam, the energy management and control system controls the steam turbine 1 to consume the thermal energy of the steam to generate driving force, driving the first low-pressure compressor 4 to operate. The compressed air generated is supplied to the energy demand users through the energy supply pipeline after passing through the compressed air purification system. At the same time, the driving force generated by the steam turbine 1 also causes the motor / generator integrated unit 3 to operate as a generator 19, outputting electrical energy to the power grid; in the low valley mode of the power grid with sufficient steam, the energy management and control system controls the steam turbine 1 and the motor / generator integrated unit 3 to operate in a coupled manner, consuming the thermal energy of the steam and the electrical energy of the power grid respectively to generate driving force, driving the first low-pressure compressor 4, the second low-pressure compressor 6 and the high-pressure compressor 7 to operate simultaneously. Among them, the compressed air generated by the first low-pressure compressor 4 is supplied to the energy demand users through the energy supply pipeline after passing through the compressed air purification system, and the compressed air generated by the second low-pressure compressor 6 and the high-pressure compressor 7 is transported to the compressed air energy storage power generation system for energy storage. During the peak electricity consumption period, the compressed air energy storage power generation system releases the stored compressed air, driving the high-pressure expander 17 and the low-pressure expander 18 to operate, driving the generator 19 to generate electricity, outputting electrical energy to the power grid, and providing cold energy and thermal energy to the energy demand users through the energy supply pipeline.

[0068] In the peak mode of the power grid with sufficient steam, the steam turbine 1 and the motor / generator integrated unit 3 are coupled to form a power coupling by engaging the first clutch 2. The steam turbine 1 uses the surplus steam to drive the first low-pressure compressor 4 to operate, and the generated compressed air is directly supplied to users after being processed by the purification system to meet the basic gas consumption demand; at the same time, the surplus power of the steam turbine 1 drives the motor / generator integrated unit 3 in the reverse direction to be converted into a power generation mode, converting the steam thermal energy into electrical energy and feeding it back to the power grid to achieve peak shaving power supply. In this stage, the system synchronously operates the compressed heat recovery system. The low-pressure compressed heat recovered by the first heat exchanger 8 is converted into hot water and stored through the second accumulator 23, and the energy storage power generation system converts the remaining steam energy into high-pressure air and stores it in the gas storage device 14. This mode greatly improves the steam utilization rate through the dual paths of immediate production and use and surplus energy power generation, effectively relieves the peak load pressure of the power grid while ensuring the stable supply of compressed air to users, and realizes thermal energy storage using the waste heat of steam.

[0069] In the low-grid-peak mode with sufficient steam, the system switches to a multi-energy combined supply strategy that prioritizes energy storage: the energy management and control system engages the first clutch 2 and the second clutch 5 to form a combined drive mode of the steam turbine 1 and the motor / generator integrated unit 3, and uses low-cost electric energy during the low-grid-peak period to assist in driving, enabling the multi-stage compressors (the first low-pressure compressor 4, the second low-pressure compressor 6, and the high-pressure compressor 7) to operate at full power. The compressed air generated by the first low-pressure compressor 4 is directly purified and supplied to users, while the second low-pressure and high-pressure compressors 7 compress the air to a higher pressure and store it in the air storage device 14, completing the low-cost conversion of electrical energy into compressed air potential energy. When the power grid enters the peak electricity consumption period, the energy storage system releases high-pressure air. After passing through the fourth heat exchanger 15 and the fifth heat exchanger 16, it is further preheated in multiple stages using the compressed heat stored in the first heat accumulator 20 to drive the high-pressure expander 17 and the low-pressure expander 18 to generate electricity in tandem. The power generation efficiency is increased by more than 30% compared to traditional compressed air energy storage.

[0070] The low-temperature exhaust gas generated during the expansion process is collected by the cold energy storage device 22 to form cold energy supply, and the 80-120°C hot water generated by the heat exchange is transported to the user end through the first heat storage device 21. This arbitrage mechanism of valley electricity energy storage - peak electricity power generation, combined with the combined supply of cold, heat, electricity, and gas, greatly improves the comprehensive energy efficiency of the system compared to before, and also significantly reduces the energy storage cost. At the same time, through the spatio-temporal coordination of steam heat energy and valley electricity, the cascaded utilization and value maximization of energy are achieved.

[0071] In this embodiment, the energy management and control system, as the control center of the multi-mode energy supply system, includes a data acquisition and monitoring module, an operation mode control module, a fault diagnosis and emergency handling module, an energy optimization scheduling module, a human-computer interaction and visualization module, and a communication module;

[0072] Among them, the data acquisition and monitoring module is connected to the distributed sensor network and is used to collect key parameters such as the rotational speed of the steam turbine 1, the compressor pressure, and the power grid load in real time, and transmit the collected data to the operation mode control module, the fault diagnosis and emergency handling module, the energy optimization scheduling module, and the human-computer interaction and visualization module simultaneously; the data acquisition and monitoring module is also bidirectionally connected to the communication module and is used to upload data to the cloud and receive remote data acquisition instructions;

[0073] The operation mode control module receives the real-time parameter data of the data acquisition and monitoring module, the equipment status information of the fault diagnosis and emergency handling module, the scheduling strategy of the energy optimization scheduling module, and the manual control instructions of the human-machine interaction and visualization module, and outputs control signals to the actuator of the clutch mechanism, outputs operation parameter instructions to the steam turbine 1 and the motor / generator unit 3, and outputs start-stop and load adjustment instructions to the multi-stage compressor; the operation mode control module is also connected to the communication module to receive the coordination instructions from the grid dispatching center and the steam pipeline control center; based on the switching control of the clutch mechanism, the operation mode control module can dynamically adjust the drive combination of the steam turbine 1 and the motor to achieve multiple modes such as pure electric drive, steam main drive or hybrid drive, and flexibly adjust the operation stages of the multi-stage compressor to match the air supply pressure demand;

[0074] The fault diagnosis and emergency handling module receives the real-time parameters and historical data of the data acquisition and monitoring module, realizes millisecond-level anomaly detection through threshold judgment and machine learning algorithms, and sends fault information and emergency handling suggestions to the operation mode control module and sends alarm information to the human-machine interaction and visualization module; the fault diagnosis and emergency handling module is also connected to the communication module for sending fault reports to the remote monitoring center and receiving remote fault handling guidance; the fault diagnosis and emergency handling module is used to perform the following operations: real-time monitor the operation parameters of the steam turbine 1, the motor / generator unit 3 and the multi-stage compressor, and judge whether the equipment is in an abnormal state; when it is detected that the steam turbine 1 is abnormal, control the first clutch 2 to disengage, so that the motor / generator unit 3 drives the first low-pressure compressor 4 alone to continue working, ensuring the basic supply of compressed air; when it is detected that the motor / generator unit 3 is abnormal, control the first clutch 2 to engage, so that the steam turbine 1 drives the first low-pressure compressor 4 alone to continue working, ensuring the basic supply of compressed air; when it is detected that the first low-pressure compressor 4 is abnormal, control the second clutch 5 to engage, so that the second low-pressure compressor 6 replaces the first low-pressure compressor 4 to work, ensuring the basic supply of compressed air; automatically adjust the operation mode of the system according to the severity of the abnormal situation, and maximize the continuity and reliability of the energy supply;

[0075] The energy optimization scheduling module receives the real-time energy parameters of the data acquisition and monitoring module, the grid price signal transmitted by the communication module, and the user demand prediction, and outputs an optimized scheduling strategy to the operation mode control module and outputs the energy efficiency analysis result to the human-machine interaction and visualization module; the energy optimization scheduling module is also connected to the communication module to receive the grid load prediction and the steam supply plan. The energy optimization scheduling module preferentially uses low-price electricity to drive energy storage compression during the grid valley period, releases high-pressure air expansion power generation during the peak period, and realizes combined cooling, heat and power supply through compressed heat recovery and cold energy reuse, so as to improve the comprehensive energy efficiency;

[0076] The human-machine interaction and visualization module receives real-time data from the data acquisition and monitoring module, alarm information from the fault diagnosis and emergency handling module, and energy efficiency analysis results from the energy optimization scheduling module, provides real-time status monitoring, energy efficiency analysis, and manual intervention functions, and sends control instructions from the operator to the operation mode control module; the human-machine interaction and visualization module is also connected to the communication module, receives remote operation requests, and sends system status reports. As the bridge for information exchange between the system interior and exterior, the communication module establishes two-way connections with the data acquisition and monitoring module, the operation mode control module, the fault diagnosis and emergency handling module, the energy optimization scheduling module, and the human-machine interaction and visualization module, interfaces with the power grid dispatching system, the steam pipeline network monitoring system, and the user terminal system, and establishes a secure data transmission channel between each module to ensure the real-time and reliable transmission of control instructions and status information.

[0077] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A multi-mode energy supply system based on steam turbine and motor coupling drive, characterized in that: include, A coupled drive unit, the coupled drive unit comprising a steam turbine, a motor / generator and a multi-stage compressor, the steam turbine and the motor / generator being connected to the multi-stage compressor via a clutch mechanism to form a selectively drivable power transmission path; An energy conversion subsystem connected to the coupling drive unit, the energy conversion subsystem is used to convert mechanical energy into compressed air, heat energy and cold energy; An energy supply network, connected to the energy conversion subsystem, for delivering compressed air, heat energy and cold energy to energy demanding users; An energy management control system connected to the coupled drive unit and the energy conversion subsystem, for controlling the engagement state of the clutch mechanism according to energy supply and demand conditions, adjusting the operation mode of the steam turbine and the motor / generator, and realizing multi-mode energy supply; The clutch mechanism includes a first clutch and a second clutch, and the multi-stage compressor includes a first low-pressure compressor, a second low-pressure compressor and a high-pressure compressor; wherein the steam turbine is connected to a steam input network for receiving steam energy, and the motor / generator is connected to a power grid for receiving or outputting electric energy, the steam turbine is connected to one end of the motor / generator through the first clutch, and the other end of the motor / generator is connected to one end of the first low-pressure compressor, and the other end of the first low-pressure compressor is connected to one end of the second low-pressure compressor through the second clutch, and the other end of the second low-pressure compressor is connected to the high-pressure compressor; by controlling the engagement state of the first clutch and the second clutch, the variable combination drive of the steam turbine and the motor / generator on the multi-stage compressor is realized; The energy conversion subsystem includes a compressed air purification system connected to the output end of the multi-stage compressor for cooling, drying and filtering the compressed air; a compressed air energy storage power generation system connected to the output end of the multi-stage compressor for storing high-pressure compressed air and expanding and generating electricity when needed; a compression heat recovery system connected to the output end of the multi-stage compressor for recovering the heat generated during the compression process; a first heat storage device connected to the compressed air energy storage power generation system and used to store heat energy from the compressed air energy storage power generation system; a second heat storage device connected to the compression heat recovery system and used to store heat energy from the compression heat recovery system; a cold storage device connected to the compressed air energy storage power generation system and used to store and distribute cold energy; The compressed air purification system comprises a first heat exchanger, an air dryer, a precision filter and an air storage tank; wherein the air inlet end of the first heat exchanger is connected to the output end of the first low-pressure compressor, the air outlet end of the first heat exchanger is connected to the air inlet end of the air dryer, the air outlet end of the air dryer is connected to the air inlet end of the precision filter, the air outlet end of the precision filter is connected to the air inlet end of the air storage tank, and the air outlet end of the air storage tank is connected to the compressed air delivery pipeline in the energy supply network; The compressed air energy storage power generation system includes a second heat exchanger, a third heat exchanger, an air storage device, a first heat accumulator, a fourth heat exchanger, a fifth heat exchanger, a high-pressure expander, a low-pressure expander and a generator; wherein the air inlet end of the second heat exchanger is connected to the air outlet end of the second low-pressure compressor, the air outlet end of the second heat exchanger is connected to the air inlet end of the high-pressure compressor, the air outlet end of the high-pressure compressor is connected to the air inlet end of the third heat exchanger, the air outlet end of the third heat exchanger is connected to the air inlet end of the air storage device, the air outlet end of the air storage device is connected to the air inlet end of the fourth heat exchanger, the air outlet end of the fourth heat exchanger is connected to the air inlet end of the high-pressure expander, the air outlet end of the high-pressure expander is connected to the air inlet end of the fifth heat exchanger, the air outlet end of the fifth heat exchanger is connected to the air inlet end of the low-pressure expander, and the low-pressure expander The air outlet of the machine is connected to the cold storage device, the cold storage device is connected to the cold air delivery pipeline in the energy supply network, and the output shafts of the high-pressure expander and the low-pressure expander are connected to the input shaft of the generator; the heat medium inlet end of the first heat accumulator is respectively connected to the heat medium outlet ends of the second heat exchanger and the third heat exchanger, and the heat medium outlet end of the first heat accumulator is respectively connected to the heat medium inlet ends of the fourth heat exchanger and the fifth heat exchanger, the refrigerant inlet end of the first heat accumulator is used to receive cold water, and the refrigerant outlet end of the first heat accumulator is respectively connected to the refrigerant inlet ends of the second heat exchanger and the third heat exchanger, and the heat medium outlet ends of the fourth heat exchanger and the fifth heat exchanger are connected to the first heat storage device, the first heat storage device is used to store hot water, and is connected to the hot water delivery pipeline in the energy supply network; The compression heat recovery system includes a second heat accumulator and a second heat storage device; wherein the heat medium inlet end of the second heat accumulator is used to receive hot heat transfer oil and is connected to the heat medium outlet end of the first heat exchanger, the heat medium outlet end of the second heat accumulator is used to output hot water and is connected to the second heat storage device, the refrigerant inlet end of the second heat accumulator is used to receive cold water, the refrigerant outlet end of the second heat accumulator is used to output cold heat transfer oil and is connected to the refrigerant inlet end of the first heat exchanger; the second heat storage device is used to store hot water and is connected to the hot water delivery pipeline in the energy supply network.

2. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 1, characterized in that: The energy management and control system controls the engagement state of the clutch mechanism and the operation combination of the multi-stage compressor according to the steam supply status and the power consumption status of the power grid, so that the system can realize multiple operation modes under different conditions. The multiple operation modes include: no steam supply mode, partial steam supply mode, steam-sufficient power grid peak mode and steam-sufficient power grid valley mode.

3. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 2, characterized in that: In the steam-free supply mode, the energy management and control system controls the motor / generator to consume the electric energy of the power grid to generate driving force, thereby driving the first low-pressure compressor to operate, and the generated compressed air passes through the compressed air purification system and then supplies compressed air to the energy demand user through the energy supply pipeline network; In the partial steam supply mode, the energy management and control system controls the steam turbine and the motor / generator to work in coupling, respectively consuming the thermal energy of the steam and the electrical energy of the power grid to generate driving force, thereby driving the first low-pressure compressor to operate, and the generated compressed air passes through the compressed air purification system and then is supplied to the energy demand users through the energy supply pipeline network.

4. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 2 or 3, characterized in that: In the peak mode of the steam-sufficient power grid, the energy management and control system controls the steam turbine to consume the thermal energy of the steam to generate a driving force, thereby driving the first low-pressure compressor to operate. The generated compressed air passes through the compressed air purification system and then supplies compressed air to the energy demand user through the energy supply pipeline network. At the same time, the driving force generated by the steam turbine also enables the motor / generator integrated machine to work as a generator to output electrical energy to the power grid. In the valley mode of the steam-sufficient power grid, the energy management and control system controls the steam turbine and the motor / generator integrated machine to work in coupling, thereby consuming the thermal energy of the steam and the electrical energy of the power grid to generate a driving force, thereby driving the first low-pressure compressor to operate. The compressor, the second low-pressure compressor and the high-pressure compressor operate simultaneously, wherein the compressed air generated by the first low-pressure compressor passes through the compressed air purification system and then supplies compressed air to the energy demand users through the energy supply pipeline network, and the compressed air generated by the second low-pressure compressor and the high-pressure compressor are transported to the compressed air energy storage power generation system for energy storage. During peak electricity consumption, the compressed air energy storage power generation system releases the stored compressed air, drives the high-pressure expander and the low-pressure expander to operate, drives the generator to generate electricity, outputs electrical energy to the power grid, and provides cold energy and heat energy to the energy demand users through the energy supply pipeline network.

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