Multi-mode energy supply system based on coupling driving of steam turbine and motor

Abstract

The invention discloses a multi-mode energy supply system based on steam turbine and motor coupling driving, which comprises a coupling driving unit, the coupling driving unit comprises a steam turbine, a motor / power generation all-in-one machine and a multi-stage compressor, and the steam turbine and the motor / power generation all-in-one machine are connected with the multi-stage compressor through a clutch mechanism. A power transmission path capable of being selectively driven is formed; the energy conversion subsystem is connected with the coupling driving unit and used for converting the mechanical energy into compressed air, heat energy and cold energy; the energy supply pipe network is connected with the energy conversion subsystem and used for conveying compressed air, heat energy and cold energy to the energy demand users; the energy management control system is connected with the coupling driving unit and the energy conversion subsystem and used for controlling the joint state of a clutch mechanism according to the energy supply and demand conditions, adjusting the operation modes of a steam turbine and a motor / power generation all-in-one machine and achieving multi-mode energy supply; the system has the advantages of multi-energy complementation, flexible adjustment and efficient utilization of various energy sources.

Description

Technical Field

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

[0002] With the diversification 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 operations, multiple 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 companies, these demands often exist simultaneously and are interrelated. Therefore, it is necessary to establish a system that can integrate multiple energy forms, achieve efficient conversion and flexible adjustment, which can not only improve energy utilization efficiency and reduce environmental load, but also reduce the comprehensive operating costs of enterprises, and achieve improved economic and environmental benefits.

[0003] The existing energy system mainly adopts single cogeneration or trigeneration of heat and power. Among them, the single cogeneration system usually uses steam turbines as the main equipment, while the trigeneration system mostly uses gas turbines or internal combustion engines as prime movers. For compressed air supply, the traditional mode is that each gas-using enterprise independently supplies and uses air compressors of different types and brands, resulting in different performance, reliability and maintenance costs. Although the centralized gas supply mode can effectively reduce the cost of gas-using enterprises, the electricity cost of high-power compressors during peak and valley electricity price periods varies significantly. In addition, many large enterprises often generate surplus steam during the production process, especially cogeneration thermal power plants, which often produce excess steam in summer.

[0004] In summary, the prior art has the following deficiencies: 1. Existing systems generally use a single driving source and cannot achieve the comprehensive utilization of multiple energy forms. This directly leads to the lack of flexibility in the energy conversion path and the difficulty of the system to make timely adjustments according to changes in user needs, thus greatly reducing energy utilization; 2. Due to the single energy conversion path, the system operation mode is also fixed, which cannot adapt to seasonal changes and load fluctuations, further restricting the possibility of multifunctional and efficient operation of the system. The low energy utilization efficiency is also reflected in the treatment of surplus steam. The existing system is difficult to effectively utilize these surplus energy, and there is also a lack of effective means to absorb fluctuating renewable energy, which makes the power grid's peak-shaving and valley-filling capacity seriously insufficient; Based on the above problems, there is an urgent need to develop a multi-mode energy supply system that can comprehensively utilize multiple energy sources, flexibly adjust different load demands, and adapt to the fluctuating characteristics of renewable energy, so as to fundamentally solve the limitations of existing technologies. Summary of the invention

[0005] 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.

[0006] 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: 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 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 energy supply and demand conditions, adjust the operating mode of the steam turbine and the motor / generator, and realize multi-mode energy supply.

[0007] 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.

[0008] Preferably, the energy conversion subsystem comprises: 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 it to generate 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, for storing 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; The cold storage device is connected to the compressed air energy storage power generation system and is used for storing and distributing cold energy.

[0009] Preferably, the compressed air purification system includes 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.

[0010] Preferably, the compressed air energy storage power generation system comprises 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, and 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 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, the refrigerant outlet end of the first heat accumulator is connected to the refrigerant inlet end of the second 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.

[0011] Preferably, 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.

[0012] 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 status and the power consumption status of the power grid, 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 power grid peak mode and steam-sufficient power grid valley mode.

[0013] 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, 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 users 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 steam and 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 users through the energy supply pipeline network.

[0014] Preferably, 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 steam to generate 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 users 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 steam and the electrical energy of the power grid to generate driving force, thereby driving the first low-pressure compressor to operate. The high-pressure 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.

[0015] Compared with the prior art, the advantages of the present invention are: the system realizes the technical solution of multi-energy coordinated supply through the coupling drive of the steam turbine and the motor / generator. The core is to use the clutch mechanism to flexibly connect the steam turbine, the motor / generator and the multi-stage compressor to form a power transmission path that can be selectively switched according to the actual energy situation. The system can intelligently select a single power source drive or a joint drive mode under different working conditions: when there is sufficient steam, the steam turbine drive is used first, and when there is a lack of steam, it can be switched to the motor drive, or energy complementation and energy storage can be achieved during peak and 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 network; the energy management control system monitors the energy supply and demand situation in real time, automatically adjusts the clutch mechanism engagement state and the operating parameters of each device, and realizes the intelligent operation of the system.

[0016] This design not only greatly improves energy utilization efficiency and effectively responds to fluctuations in energy supply, but also meets the complex needs of industrial enterprises for multiple energy sources through flexible conversion and complementarity of multiple energy forms. It also has functions such as peak load shifting and valley filling of power grid and utilization of surplus steam, which reduces operating costs while improving system reliability and environmental friendliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the workflow of the present invention; Figure 2 It is a pipeline schematic diagram of the present invention; In the figure, 1. steam turbine; 2. first clutch; 3. motor / generator; 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. gas storage device; 15. fourth heat exchanger; 16. fifth heat exchanger; 17. high-pressure expander; 18. low-pressure expander; 19. generator; 20. first heat accumulator; 21. first heat storage device; 22. cold storage device; 23. second heat accumulator; 24. second heat storage device. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] Embodiment 1: Figure 1-Figure 2 As shown, a multi-mode energy supply system based on steam turbine and motor coupling drive includes: A coupled drive unit, the coupled drive unit includes a steam turbine 1, a motor / generator 3 and a multi-stage compressor, the steam turbine 1 and the motor / generator 3 are connected to the multi-stage compressor via a clutch mechanism to form a selectively drivable power transmission path; An energy conversion subsystem is connected to the coupled driving unit, and the energy conversion subsystem is used to convert mechanical energy into compressed air, heat energy and cold energy; Energy supply network, connected to the energy conversion subsystem, used to deliver compressed air, heat and cold energy to energy demand users; The 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 1 and the motor / generator 3, and realize multi-mode energy supply.

[0021] Embodiment 2: Figure 1-Figure 2 As shown, different from the first embodiment, 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 for receiving steam energy, the motor / generator integrated machine 3 is connected to the power grid for receiving or outputting electric energy, the steam turbine 1 is connected to the motor / generator integrated machine 3 through the first clutch 2, the other end of the 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 state of the first clutch 2 and the second clutch 5, the variable combination drive of the steam turbine 1 and the motor / generator integrated machine 3 on the multi-stage compressor is realized.

[0022] In this structure, the first clutch 2 connects the steam turbine 1 and the motor / generator 3, and 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 heat energy through the steam input network, and the motor / generator 3 is connected to the power grid, which can consume electric energy to drive the system and output electric 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 realize the working mode of the steam turbine 1 driven alone, the motor / generator 3 driven alone, or the combined drive of the two; by controlling the engagement state of the second clutch 5, the system can flexibly adjust the working combination of the compressor group to realize the flexible switching of the first, second or third stage compression.

[0023] When energy supply fluctuates, the structure can make a smooth transition to ensure continuous and stable operation of the system; when load demand changes, the compressor combination can be adjusted to accurately match production capacity and demand to avoid energy waste; and during peak and valley periods of the power grid, the system can intelligently switch power sources to achieve 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.

[0024] In this embodiment, the energy conversion subsystem includes: A compressed air purification system connected to the output end of the multi-stage compressor is used to cool, dry and filter the compressed air; A compressed air energy storage power generation system, connected to the output end of the multi-stage compressor, is used to store high-pressure compressed air and expand it to generate 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 21 is connected to the compressed air energy storage power generation system and is used to store heat energy from the compressed air energy storage power generation system; A second heat storage device 24 is connected to the compression heat recovery system and is used to store heat energy from the compression heat recovery system; The cold storage device 22 is connected to the compressed air energy storage power generation system and is used to store and distribute cold energy.

[0025] The energy conversion subsystem achieves efficient utilization and flexible supply of energy through multiple energy recovery and conversion. The system is composed of three 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 provision of high-quality compressed air to users; the compressed air energy storage power generation system stores excess compressed air and converts it into electricity through expansion power generation during peak periods of electricity demand, achieving the function of peak shaving and valley filling; the compression heat recovery system specifically recovers a large amount of heat energy generated during the compression process, avoiding energy loss in traditional systems. The first heat storage device 21 recovers and stores heat energy in the compressed air energy storage power generation system, the second heat storage device 24 recovers and stores heat energy in the compression heat recovery system, and the cold storage device 22 uses 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 and cold energy, meeting the diverse energy needs of different users at different times.

[0026] This structure not only significantly improves the overall energy utilization efficiency of the system and reduces energy waste, but also reduces system operating costs and improves the reliability and flexibility of energy supply through complementary conversion and cascade utilization of multiple energy forms.

[0027] In this embodiment, the compressed air purification system includes a first heat exchanger 8, an air dryer 9, a precision filter 10 and an air storage tank 11; wherein, 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 air storage tank 11, and the air outlet end of the air storage tank 11 is connected to the compressed air delivery pipeline in the energy supply network.

[0028] The system consists of four modules: the first heat exchanger 8, the air dryer 9, the precision filter 10 and the air storage tank 11, forming a complete compressed air processing process. The working principle is: 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 preliminarily condensing part of the water. The cooled compressed air then enters the air dryer 9, and further removes the water in the air by adsorption or freezing, significantly reducing the dew point of the compressed air. Then, the dried compressed air enters the precision filter 10 to filter out tiny particles, oil mist and other impurities in the air to ensure that the cleanliness of the compressed air meets the user's requirements. Finally, the fully purified compressed air enters the air storage tank 11, where pressure stability and pulsation elimination are achieved, and it also serves as a compressed air buffer storage device for the system.

[0029] The air outlet of the air storage tank 11 is connected to the compressed air delivery pipeline in the energy supply network to provide stable, clean and dry compressed air for each end user. This design not only ensures the quality of the compressed air and avoids damage to the user's equipment by moisture, oil and impurities, but also reduces the frequent start and stop of the compressor through the buffering effect of the air storage tank 11, prolongs the life of the equipment, and improves the reliability and stability of the system's air supply, meeting the strict requirements of modern industry for high-quality compressed air.

[0030] Embodiment 3: Figure 1-Figure 2As shown, different from the second embodiment, the compressed air energy storage power generation system includes a second heat exchanger 12, a third heat exchanger 13, an air 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 air inlet end of the second heat exchanger 12 is connected to the air outlet end of the second low-pressure compressor 6, the air outlet end of the second heat exchanger 12 is connected to the air inlet end of the high-pressure compressor 7, the air outlet end of the high-pressure compressor 7 is connected to the air inlet end of the third heat exchanger 13, the air outlet end of the third heat exchanger 13 is connected to the air inlet end of the air storage device 14, the air outlet end of the air storage device 14 is connected to the air inlet end of the fourth heat exchanger 15, the air outlet end of the fourth heat exchanger 15 is connected to the air inlet end of the high-pressure expander 17, the air outlet end of the high-pressure expander 17 is connected to the air inlet end of the fifth heat exchanger 16, and the air outlet end of the fifth heat exchanger 16 is connected to the The air inlet end of the low-pressure expander 18 is connected, the air 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 delivery pipeline in the energy supply 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, and 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, and 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, the first heat storage device 21 is used to store hot water and is connected to the hot water delivery pipeline in the energy supply network.

[0031] In 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 pressurization, and then is cooled again by the third heat exchanger 13, and is finally stored in the gas storage device 14. The large amount of compression heat generated in this process will not be wasted, but will be efficiently recovered and stored by the first heat accumulator 20 through the second heat exchanger 12 and the third heat exchanger 13; in the power generation stage, the high-pressure air released by 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 to do work. The two-stage expanders jointly drive the generator 19 to generate electricity. At this time, the first heat accumulator 20 releases the previously stored heat energy to the fourth heat exchanger 15 and the fifth heat exchanger 16, which significantly improves the air expansion power and system efficiency.

[0032] The advantage of the system also lies in its multi-energy output capability: in addition to transmitting electricity to the grid, the cold air exhausted by 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 thermal 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 the traditional compressed air energy storage system, but also realizes multi-energy in one machine through multi-stage energy recovery and multi-form conversion, meeting the diversified needs of industrial users for compressed air, electricity, heat energy and cold energy.

[0033] In this embodiment, the compression heat recovery system includes a second heat accumulator 23 and a second heat storage device 24; wherein, 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, 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 network.

[0034] The system is mainly composed of a second heat accumulator 23 and a second heat storage device 24, forming a closed-loop heat recovery network. The working principle is: the high-temperature compressed air generated by the first low-pressure compressor 4 when working enters the first heat exchanger 8, and the heat energy is transferred to the heat medium inlet end of the second heat accumulator 23 through the heat exchange medium (hot heat transfer oil). At the same time, the refrigerant inlet end of the second heat accumulator 23 receives cold water, and absorbs the heat in the hot heat transfer 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 heat transfer oil (cold heat transfer oil) returns from the refrigerant outlet end of the second heat accumulator 23 to the refrigerant 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 users with a stable supply of heat energy through the hot water delivery pipeline in the energy supply network.

[0035] In this embodiment, 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 achieve 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.

[0036] As the control center of the entire multi-mode energy supply system, the energy management control system realizes intelligent operation and regulation based on changes in external conditions. The system controls the engagement state of the clutch mechanism and the operating combination of the multi-stage compressor by real-time monitoring of two key parameters: steam supply status and grid power consumption status, so that the entire system can flexibly switch between four operating modes.

[0037] In the no steam supply mode, the system automatically cuts off the connection of the steam turbine 1 and switches to the motor / generator 3 to drive it alone, ensuring that the basic supply of compressed air can be maintained when steam resources are scarce; when the steam supply is partially restored but not yet sufficient, the system starts the partial steam supply mode, and the steam turbine 1 and the motor / generator 3 work together to form a complementary drive to balance the energy use cost and supply stability; when the steam supply is sufficient and the power grid is in the peak period of electricity consumption, the system switches to the steam sufficient power grid peak mode. At this time, the steam turbine 1 not only drives the compressor to operate, but also drives the motor / generator 3 to work in reverse to generate electricity, transmit electricity to the power grid, and effectively alleviate the peak load of the power grid; when the steam is sufficient and the power grid is in the low period of electricity consumption, the system adopts the steam sufficient power grid low mode, combines the power of the steam turbine 1 and the motor / generator 3, and drives the multi-stage compressor to operate at the same time, converts cheap electricity and surplus steam into compressed air energy for storage, and realizes 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.

[0038] In this embodiment, in the non-steam supply mode, the energy management and control system controls the motor / generator integrated machine 3 to consume the electric energy of the power grid to generate driving force, drive the first low-pressure compressor 4 to operate, and the generated compressed air passes through the compressed air purification system, and then supplies compressed air to energy-demanding 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 integrated machine 3 to work in coupling, respectively consuming the thermal energy of the steam and the electric energy of the power grid to generate driving force, drive the first low-pressure compressor 4 to operate, and the generated compressed air passes through the compressed air purification system, and then supplies compressed air to energy-demanding users through the energy supply pipeline network.

[0039] The multi-mode energy supply system achieves flexibility and high efficiency in energy supply through the switching and coordinated driving of power sources. In the no-steam supply mode, the energy management and control system disconnects the first clutch 2, so that the steam turbine 1 is disconnected from the power transmission chain. At this time, the motor / generator 3 acts as an independent power source, consuming power from the power grid to drive the first low-pressure compressor 4 to operate. After the compressed air is cooled by the first heat exchanger 8, it is purified and pressure-stabilized by the air dryer 9, the precision filter 10 and the air storage tank 11 in turn, and finally provides clean compressed air to users through the energy supply network. This mode ensures that the basic gas supply demand can be maintained when the steam is interrupted to avoid production interruptions, but its energy efficiency is limited by a single electric drive.

[0040] 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 drives the main shaft with steam heat energy, and the motor / generator 3 supplements the electric energy according to the real-time load demand, and the two work together to drive the first low-pressure compressor 4 to work. At this time, the steam heat energy and the grid electric energy are dynamically allocated on demand, which can not only reduce energy consumption by using low-cost steam, but also compensate for the fluctuation of steam power through motor adjustment to stabilize the compressor output. The compressed air further recovers heat energy in the purification system, and the second heat accumulator 23 exchanges heat between the hot heat transfer oil exported by the first heat exchanger 8 and cold water to generate hot water stored in the second heat storage device 24 to realize the utilization of waste heat.

[0041] This hybrid drive mode not only improves the system's energy efficiency, but also responds quickly to load changes by dynamically adjusting the power ratio, significantly reducing dependence on a single energy source while ensuring gas supply quality, and enhancing the system's ability to resist risks. The smooth switching of the two modes relies on the precise control of the clutch mechanism, combined with the multi-level energy recovery network of the energy conversion subsystem, so that the system can always complete energy conversion and supply with the best economy when the steam supply is unstable or the power grid electricity price fluctuates.

[0042] In this embodiment, in the peak mode of the steam-sufficient power grid, the energy management and control system controls the steam turbine 1 to consume the thermal energy of steam to generate driving force, driving the first low-pressure compressor 4 to operate, and the generated compressed air passes through the compressed air purification system and then supplies compressed air to energy demand users through the energy supply pipeline network. At the same time, the driving force generated by the steam turbine 1 also enables the motor / generator integrated machine 3 to work as a generator 19 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 1 and the motor / generator integrated machine 3 to work in coupling, respectively consuming the thermal energy of steam and the electrical energy of the power grid to generate driving force, driving the first low-pressure compressor 4 to operate. The first low-pressure compressor 4, the second low-pressure compressor 6 and the high-pressure compressor 7 operate simultaneously, wherein the compressed air generated by the first low-pressure compressor 4 passes through the compressed air purification system, and then supplies compressed air to energy demand users through the energy supply pipeline network; 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 peak electricity consumption, the compressed air energy storage power generation system releases the stored compressed air, drives the high-pressure expander 17 and the low-pressure expander 18 to operate, drives the generator 19 to generate electricity, outputs electrical energy to the power grid, and provides cold energy and heat energy to energy demand users through the energy supply pipeline network.

[0043] In the peak mode of the power grid with sufficient steam, the first clutch 2 is engaged to form a power coupling between the steam turbine 1 and the motor / generator 3. The steam turbine 1 uses surplus steam to drive the first low-pressure compressor 4 to operate, and the compressed air generated is directly supplied to users after being processed by the purification system to meet the basic gas demand; at the same time, the surplus power of the steam turbine 1 reversely drives the motor / generator 3 to switch to the power generation mode, converting the steam thermal energy into electrical energy to feed back to the power grid to achieve peak power supply. At this stage, the system synchronously operates the compression heat recovery system, and the low-pressure compression heat recovered by the first heat exchanger 8 is converted into hot water storage through the second heat accumulator 23, while 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 surplus energy power generation. While ensuring a stable supply of compressed air to users, it effectively alleviates the peak load pressure of the power grid and uses the waste heat of steam to achieve thermal energy storage.

[0044] In the off-peak mode of the steam-sufficient grid, the system switches to a multi-energy supply strategy with energy storage priority: the energy management control system engages the first clutch 2 and the second clutch 5 to form a joint drive mode of the steam turbine 1 and the motor / generator 3, and uses low-cost electricity during the off-peak period to assist the drive, so that the multi-stage compressor (the first low-pressure compressor 4, the second low-pressure compressor 6, and the high-pressure compressor 7) can run at full power. The compressed air generated by the first low-pressure compressor 4 is directly purified and supplied to users, and 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 electric energy-compressed air potential energy. When the grid enters the peak power consumption period, the energy storage system releases high-pressure air, passes through the fourth heat exchanger 15 and the fifth heat exchanger 16, and then uses the compression heat stored in the first heat accumulator 20 for multi-stage preheating, driving the high-pressure expander 17 and the low-pressure expander 18 to generate electricity in conjunction, and the power generation efficiency is increased by more than 30% compared with traditional compressed air energy storage.

[0045] The low-temperature exhaust gas generated during the expansion process is collected by the cold storage device 22 to form cold energy supply, and the 80-120℃ hot water generated by heat exchange is delivered to the user end through the first heat storage device 21. This arbitrage mechanism of valley power storage and peak power generation, combined with the combined supply of cold, heat, electricity and gas, greatly improves the comprehensive energy efficiency of the system compared with before, and the energy storage cost is also greatly reduced. At the same time, through the temporal and spatial coordination of steam thermal energy and valley electric energy, the energy cascade utilization and value maximization are realized.

[0046] In this embodiment, the energy management control system serves as the control center of the multi-mode energy supply system, including a data acquisition and monitoring module, an operation mode control module, a fault diagnosis and emergency processing module, an energy optimization scheduling module, a human-computer interaction and visualization module, and a communication module; Among them, the data acquisition and monitoring module is connected to the distributed sensor network to collect key parameters such as turbine 1 speed, compressor pressure, grid load, etc. in real time, and transmit the collected data to the operation mode control module, fault diagnosis and emergency processing module, energy optimization scheduling module and human-computer interaction and visualization module at the same time; the data acquisition and monitoring module is also bidirectionally connected to the communication module to upload data to the cloud and receive remote data acquisition instructions; 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 processing module, the scheduling strategy of the energy optimization scheduling module, and the manual control instructions of the human-computer 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 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 coordination instructions from the power grid dispatching center and the steam pipe network 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 realize multiple modes such as pure electric drive, steam main drive or hybrid drive, and flexibly adjust the operating level of the multi-stage compressor to match the gas supply pressure requirement; The fault diagnosis and emergency processing 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 algorithm, and sends fault information and emergency processing suggestions to the operation mode control module, and sends alarm information to the human-computer interaction and visualization module; the fault diagnosis and emergency processing module is also connected to the communication module to send fault reports to the remote monitoring center and receive remote fault processing guidance; the fault diagnosis and emergency processing module is used to perform the following operations: real-time monitoring of the operating parameters of the steam turbine 1, the motor / generator integrated machine 3 and the multi-stage compressor to determine whether the equipment is in an abnormal state; when an abnormality is detected in the steam turbine 1 , control the first clutch 2 to be disconnected, so that the motor / generator integrated machine 3 drives the first low-pressure compressor 4 alone to continue working, thereby ensuring the basic supply of compressed air; when an abnormality is detected in the motor / generator integrated machine 3, control the first clutch 2 to be engaged, so that the steam turbine 1 drives the first low-pressure compressor 4 alone to continue working, thereby ensuring the basic supply of compressed air; when an abnormality is detected in the first low-pressure compressor 4, control the second clutch 5 to be engaged, so that the second low-pressure compressor 6 replaces the first low-pressure compressor 4 to work, thereby ensuring the basic supply of compressed air; according to the severity of the abnormality, automatically adjust the system operation mode to maximize the continuity and reliability of energy supply; The energy optimization and scheduling module receives the real-time energy parameters from the data acquisition and monitoring module, the grid price signal and user demand forecast from the communication module, and outputs the optimization scheduling strategy to the operation mode control module and the energy efficiency analysis results to the human-computer interaction and visualization module. The energy optimization and scheduling module is also connected to the communication module to receive the grid load forecast and steam supply plan. The energy optimization and scheduling module gives priority to using low-cost electricity to drive energy storage compression in the valley section of the grid, and releases high-pressure air expansion to generate electricity in the peak section. It also realizes combined heat, cooling and power generation through compression heat recovery and cold energy reuse, thereby improving the overall energy efficiency. The human-computer interaction and visualization module receives real-time data from the data acquisition and monitoring module, alarm information from the fault diagnosis and emergency processing module, and energy efficiency analysis results from the energy optimization and scheduling module, provides real-time status monitoring, energy efficiency analysis, and manual intervention functions, and sends operator control instructions to the operation mode control module; the human-computer interaction and visualization module is also connected to the communication module to receive remote operation requests and send system status reports. As a bridge for internal and external information exchange in the system, the communication module establishes a two-way connection with the data acquisition and monitoring module, the operation mode control module, the fault diagnosis and emergency processing module, the energy optimization and scheduling module, and the human-computer interaction and visualization module, connects to the power grid dispatching system, the steam pipe network monitoring system, and the user terminal system, and establishes a secure data transmission channel between the modules to ensure the real-time and reliable transmission of control instructions and status information.

[0047] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also 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 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.

2. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 1, characterized in that: 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 realized.

3. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 2, characterized in that: 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 it to generate 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, for storing 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; The cold storage device is connected to the compressed air energy storage power generation system and is used for storing and distributing cold energy.

4. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 3, characterized in that: The compressed air purification system includes 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.

5. The multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 3 is characterized in that: 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 The air outlet end of the low-pressure expander is connected to the cold storage device, and the cold storage device is connected to the cold air delivery pipeline in the energy supply network. 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 connected to the refrigerant inlet end of the second 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.

6. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 4, characterized in that: 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.

7. The multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 5 is 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.

8. The multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 7 is 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.

9. A multi-mode energy supply system based on steam turbine and motor coupling drive according to claim 7 or 8, 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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