An electric heating bidirectional coupling peak shaving system and method

Abstract

The application provides an electric heating bidirectional coupling peak regulation system, and particularly relates to the technical field of new energy consumption, the electric heating bidirectional coupling peak regulation system comprises a low-temperature heat absorber, which is sequentially connected with a high-temperature heat exchanger, an adiabatic compressor, a high-temperature heat radiator and an intermediate regenerator; one outlet end of the intermediate regenerator is sequentially connected with an expansion turbine, an intermediate low-temperature heat exchanger, an intermediate high-temperature heat exchanger and the low-temperature heat absorber; and the other outlet end of the intermediate regenerator is sequentially connected with the intermediate low-temperature heat exchanger and the low-temperature heat absorber. The three independent cascade heat exchangers of the intermediate high-temperature heat exchanger, the intermediate regenerator and the intermediate low-temperature heat exchanger are used in cooperation with the low-temperature heat absorber arranged at the front end and used for recycling 100-350 DEG C low-grade waste heat in an industrial park, so that the whole temperature range circulating heat efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of new energy consumption technology, and in particular to an electrothermal bidirectional coupling peak shaving system and method. Background Technology

[0002] As the installed capacity of new energy sources such as wind power and photovoltaics continues to increase, the volatility and intermittency of new energy output have exacerbated the problem of wind and solar curtailment in some areas. The power grid's demand for rapid and flexible peak-shaving resources continues to rise. At the same time, industrial parks such as metallurgy, building materials, and chemicals have low-grade waste heat of 100-350℃ on the one hand, and high-temperature heat demand of nearly 600℃ on the other.

[0003] Existing reversible Brayton energy storage systems mostly use dual molten salt tanks (hot and cold), single-stage regeneration, and supercritical carbon dioxide as the working fluid. These systems suffer from problems such as large equipment redundancy, complex structure, significant losses due to mixing of hot and cold fluids, and insufficient adaptability to high-temperature conditions, resulting in low overall heat recovery efficiency. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes an electrothermal bidirectional coupling peak-shaving system and method.

[0005] This invention is achieved through the following technical solution: This invention proposes an electrothermal bidirectional coupling peak-shaving system comprising a coaxial reversible power unit, a three-stage cascade regenerative heat exchange unit, a pre-low-temperature waste heat recovery unit, and a high-temperature zone heat exchange unit, wherein: The pre-low temperature waste heat recovery unit includes a low temperature heat absorber, which is used to recover preheat in the low temperature zone of the industrial park. The three-stage cascade regenerative heat exchanger includes an intermediate high-temperature heat exchanger, an intermediate regenerator, and an intermediate low-temperature heat exchanger. The coaxial reversible power main unit includes an adiabatic compressor, an expansion turbine, and a bidirectional motor generator integrated unit. The bidirectional motor generator integrated unit is connected to the adiabatic compressor and the expansion turbine for grid-connected power generation. The high-temperature heat exchange unit includes a high-temperature heat exchanger, which is used to exchange heat with the industrial park and the high-temperature molten salt zone. In the mode of power abandonment and heating, the low-pressure circulating working fluid passes through the low-temperature heat absorber, the intermediate high-temperature heat exchanger and the adiabatic compressor in sequence to compress and heat up, and then enters the high-temperature heat exotherm to distribute the heat output of the high-temperature heat exotherm to one or both of the industrial park and the high-temperature molten salt zone. After heat exchange, the circulating working fluid enters the intermediate heat exchanger, the expansion turbine and the intermediate low-temperature heat exchanger to recover heat and pressure to do work. In peak power generation mode, one or two heating circulating working fluids in industrial parks and high-temperature molten salt zones control the high-temperature and high-pressure working fluids to work through intermediate regenerators and expansion turbines, and enable bidirectional motor generators to transmit electrical energy to the grid.

[0006] Furthermore, the high-temperature heat exchange unit also includes a molten salt tank, which has a naturally stratified upper high-temperature molten salt heat storage zone, a middle transition zone, and a lower low-temperature molten salt buffer heat exchange zone.

[0007] Furthermore, the molten salt tank is equipped with two isolated, complementary, and non-connected heat exchange coils, each having a heat storage channel for heating and a heat release channel for power generation.

[0008] Furthermore, the high-temperature heat exchange unit also includes an industrial multi-stage heat exchange module, which includes a high-temperature kiln heat exchange branch, a steam generator branch, and a brine heat exchange branch arranged in parallel. The industrial multi-stage heat exchange module, the molten salt tank, and the high-temperature heat exchanger are connected.

[0009] Furthermore, the coaxial reversible power main unit also includes a high-temperature gas path dynamic sealing assembly. The adiabatic compressor, the bidirectional motor generator integrated unit, and the expansion turbine are connected by a coaxial main shaft. The coaxial main shaft is provided with a high-temperature gas path dynamic sealing assembly at the connection points between the bidirectional motor generator integrated unit and the expansion turbine and between the bidirectional motor generator integrated unit and the adiabatic compressor.

[0010] Furthermore, the heat source side of the low-temperature heat absorber is connected to one or more of industrial exhaust gas, industrial cooling water, or low-grade waste gas, and is used to heat the low-pressure circulating working fluid.

[0011] Furthermore, it also includes a control unit, which includes a PLC main controller, a bidirectional power grid acquisition module connected to the bidirectional motor generator integrated machine, an industrial load acquisition module, a multi-point temperature sensor installed in the system, and a step-by-step electric bidirectional switching valve group installed in the system. The bidirectional motor generator integrated machine has power switching terminals.

[0012] Furthermore, the circulation control within the system employs high-purity helium or a nitrogen-argon inert gas mixture.

[0013] Furthermore, a peak-shaving method for an electrothermal bidirectional coupling peak-shaving system is characterized by comprising: In the power-waste heating mode, the low-pressure circulating working fluid is controlled to pass through the low-temperature heat absorber and the intermediate high-temperature heat exchanger in sequence to raise the temperature, and then passes through the adiabatic compressor to increase the pressure. It then enters the high-temperature heat exotherm. The heat output of the high-temperature heat exotherm is distributed to one or two of the industrial multi-stage heat exchange modules and molten salt tanks. After the working fluid outputs heat, it enters the intermediate heat exchanger, the expansion turbine and the intermediate low-temperature heat exchanger to recover heat and pressure to do work. In peak power generation mode, one or two heating circulating working fluids from molten salt tanks or industrial multi-stage heat exchange modules are used to control the high-temperature and high-pressure working fluid to work through intermediate regenerators and expansion turbines, and enable the bidirectional motor generator to transmit electrical energy to the grid.

[0014] Furthermore, when switching modes, the loads of the adiabatic compressor and the expansion turbine are reduced to 20%-40% of the rated load. Then, the operating status of the step-by-step electric bidirectional switching valve group and the bidirectional motor generator integrated machine are switched in the set sequence, and the load is increased to the target operating load according to the set slope.

[0015] The beneficial effects of this invention are: (1) The electrothermal bidirectional coupling peak shaving system proposed in this invention utilizes three independent cascade heat exchangers: an intermediate high-temperature heat exchanger, an intermediate regenerator, and an intermediate low-temperature heat exchanger. It is combined with a low-temperature absorber set at the front end to recover low-grade waste heat of 100-350℃ in industrial parks, which can improve the full-temperature-range circulation thermal efficiency.

[0016] (2) The electrothermal bidirectional coupling peak shaving system proposed in this invention uses high-purity helium or nitrogen-argon inert gas mixture to maintain pure gaseous operation without phase change throughout the process, and can stably achieve high-temperature heating at 600℃. The same system can consume electrical energy for heating and heat storage during off-peak hours, and can also use molten salt heat storage and industrial waste heat to drive expansion turbines to generate electricity during peak hours, thus realizing the integrated coupling of continuous industrial heating and bidirectional peak shaving of the power grid.

[0017] (3) The electrothermal bidirectional coupling peak shaving method proposed in this invention automatically selects the operating mode according to the peak and valley state of the power grid and the industrial heat load state, and adopts a step-by-step switching strategy of "load reduction - valve group switching - power recovery" to effectively avoid the impact of sudden temperature and pressure changes. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the overall principle of the electrothermal bidirectional coupling peak-shaving system of the present invention. Figure 2 This is a module partitioning diagram of the electrothermal bidirectional coupling peak-shaving system of the present invention; Figure 3 This is a structural diagram of the molten salt tank of the electrothermal bidirectional coupling peak-shaving system of the present invention; Figure 4 This is a flowchart of the power curtailment heating operation of the electrothermal bidirectional coupling peak shaving system of the present invention. Figure 5 This is a flowchart of the peak power generation operation of the electrothermal bidirectional coupling peak shaving system of the present invention; In the diagram: 1. Low-temperature heat absorber; 2. Intermediate high-temperature heat exchanger; 3. Insulating compressor; 4. High-temperature heat releaser; 5. Intermediate regenerator; 6. Intermediate low-temperature heat exchanger; 7. Expansion turbine; 8. Bidirectional motor generator; 9. Molten salt tank; 91. Power generation and heat release channel; 92. Heating and heat storage channel; 10. Industrial multi-stage heat exchange module; 11. Coaxial spindle; 12. High-temperature gas path dynamic sealing assembly; 13. Power switching terminal block. The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0020] Please refer to Figures 1-5 This invention proposes an electrothermal bidirectional coupling peak-shaving system comprising a coaxial reversible power host unit, a three-stage cascade regenerative heat exchange unit, a pre-low-temperature waste heat recovery unit, and a high-temperature zone heat exchange unit, wherein: The pre-low temperature waste heat recovery unit includes a low temperature heat absorber 1, which is used to recover preheating in the low temperature zone of the industrial park. The three-stage cascade heat exchanger includes an intermediate high-temperature heat exchanger 2, an intermediate regenerator 5, and an intermediate low-temperature heat exchanger 6. The coaxial reversible power unit includes an adiabatic compressor 3, an expansion turbine 7, and a bidirectional motor generator 8. The bidirectional motor generator is connected to the adiabatic compressor 3 and the expansion turbine 7 for grid-connected power generation. The high-temperature heat exchange unit includes a high-temperature heat exchanger, which is used for heat exchange with industrial parks and high-temperature molten salt zones. In the mode of power abandonment and heating, the low-pressure circulating working fluid passes through the low-temperature heat absorber 1, the intermediate high-temperature heat exchanger 2 and the adiabatic compressor 3 in sequence to be compressed and heated, and then enters the high-temperature heat exotherm 4 to distribute the heat output of the high-temperature heat exotherm 4 to one or both of the industrial park and the high-temperature molten salt zone. After heat exchange, the circulating working fluid enters the intermediate heat exchanger, the expansion turbine 7 and the intermediate low-temperature heat exchanger 6 to recover heat and pressure to do work. In peak power generation mode, one or two heating circulating working fluids in the industrial park and high-temperature molten salt zone control the high-temperature and high-pressure working fluid to work through the intermediate regenerator 5 and the expansion turbine 7, and enable the bidirectional motor generator integrated machine to transmit electrical energy to the grid.

[0021] Specifically, the three independent cascaded regeneration units—intermediate high-temperature heat exchanger 2, intermediate regenerator 5, and intermediate low-temperature heat exchanger 6—operate under the condition of power curtailment heating. The low-pressure circulating working fluid first enters the low-temperature receiver 1 to absorb low-grade waste heat (100-350℃) from the industrial park. It then enters the intermediate high-temperature heat exchanger 2 for preheating, followed by compression and temperature increase in the adiabatic compressor 3. The high-temperature, high-pressure working fluid then enters the high-temperature exothermic generator 4, outputting heat in the 600℃ temperature range to exchange with industrial waste heat and the high-temperature molten salt zone. After heat release, part of the working fluid passes through the intermediate regenerator 5 and the expansion turbine 7, while the other part enters the intermediate low-temperature heat exchanger 6 for gradual cooling and partial work recovery. Finally, it returns to the low-temperature receiver 1, completing the reverse Brayton pure gaseous, phase-change-free heating cycle. Under peak power generation conditions, the industrial park… Together with the high-temperature molten salt zone, it provides 600℃ heat to the high-temperature exothermic generator 4. The low-pressure circulating working fluid is heated and pressurized, and then works through the intermediate regenerator 5 and the expansion turbine 7 to drive the bidirectional motor generator integrated machine to generate electricity. The low-pressure control of the expansion turbine 7 flows sequentially through the intermediate low-temperature heat exchanger 6, the intermediate high-temperature heat exchanger 2, and the low-temperature absorber 1 to recover waste heat. Finally, it returns to the high-temperature exothermic generator 4 after being pressurized at low power by the adiabatic compressor 3, completing the forward Brayton pure gaseous power generation cycle without phase change. This invention utilizes three independent stepped heat exchangers, the intermediate high-temperature heat exchanger 2, the intermediate regenerator 5, and the intermediate low-temperature heat exchanger 6, in conjunction with the low-temperature absorber 1 set at the front end to recover low-grade waste heat of 100-350℃ in the industrial park, which can improve the full-temperature range cycle thermal efficiency.

[0022] Furthermore, the high-temperature heat exchange unit also includes a molten salt tank 9, which has a naturally stratified upper high-temperature molten salt heat storage zone, a middle transition zone, and a lower low-temperature molten salt buffer heat exchange zone.

[0023] Specifically, the molten salt tank 9 is a single vertical tank that relies on the natural stratification of molten salt to form three regions: upper, middle, and lower. The upper high-temperature molten salt heat storage zone is used to provide heat for the 600℃ temperature zone.

[0024] Furthermore, the molten salt tank 9 is equipped with two isolated, complementary, and non-connected heat exchange coils, each having a heat storage flow channel 92 for heating and a heat release flow channel 91 for power generation.

[0025] Specifically, there are two different heat exchange coils. One heat exchange coil has a heating and heat storage channel 92 inside, and the other heat exchange coil has a power generation and heat release channel 91 inside. The two coils are completely isolated and do not require a circulation pump. In the power curtailment heating mode, the working fluid exchanges heat through the heating and heat storage channel 92 and stores the heat energy in the molten salt tank 9. In the peak power generation condition, the working fluid exchanges heat through the power generation and heat release channel 91 and stores the heat in the molten salt tank 9.

[0026] Furthermore, the high-temperature heat exchange unit also includes an industrial multi-stage heat exchange module 10, which includes a high-temperature kiln heat exchange branch, a steam generator branch, and a brine heat exchange branch arranged in parallel. The industrial multi-stage heat exchange module 10, the molten salt tank 9, and the high-temperature heat exchanger 4 are connected.

[0027] Specifically, the industrial multi-stage heat exchange module 10 and the molten salt tank 9 together provide 600°C of heat to the high-temperature heat exchanger 4, and provide high-temperature heat to the industrial park through three heat exchange branches.

[0028] Furthermore, the coaxial reversible power unit also includes a high-temperature gas path dynamic sealing assembly 12. The adiabatic compressor 3, the bidirectional motor generator integrated unit, and the expansion turbine 7 are connected by a coaxial main shaft 11. The coaxial main shaft 11 is provided with a high-temperature gas path dynamic sealing assembly 12 at the connection points between the bidirectional motor generator integrated unit and the expansion turbine 7 and between the bidirectional motor generator integrated unit and the adiabatic compressor 3.

[0029] Specifically, the expansion turbine 7, the adiabatic compressor 3, and the bidirectional motor generator all share a main shaft. Under peak power generation conditions, the expansion turbine 7 and the adiabatic compressor 3 drive the bidirectional motor generator to generate electricity on the grid. Under the condition of power curtailment for heating, off-peak electricity or curtailed electricity drives the bidirectional motor generator as a motor to drive the adiabatic compressor 3 and the expansion turbine 7.

[0030] Furthermore, the heat source side of the low-temperature heat absorber 1 is connected to one or more of industrial exhaust gas, industrial cooling water, or low-grade waste gas, and is used to heat the low-pressure circulating working fluid.

[0031] Specifically, the low-pressure working fluid enters the low-temperature heat absorber 1 and exchanges heat with the industrial exhaust gas, industrial cooling water or low-grade waste steam at 100-350℃ on the heat source side, thereby achieving the initial heating of the low-pressure circulating working fluid.

[0032] Furthermore, it also includes a control unit, which includes a PLC main controller, a bidirectional power grid acquisition module connected to the bidirectional motor generator integrated unit, an industrial load acquisition module, a multi-point temperature sensor installed in the system, and a step-by-step electric bidirectional switching valve group installed in the system. The bidirectional motor generator integrated unit has a power switching terminal 13.

[0033] Specifically, the step-by-step electric bidirectional switching valve group includes V1 located between the adiabatic compressor 3 and the high-temperature heat exchanger 4, V2 located between the intermediate high-temperature heat exchanger 2 and the adiabatic compressor 3, V3 located between the high-temperature heat exchanger 4 and the molten salt tank 9, V4 located between the high-temperature heat exchanger 4 and the industrial multi-stage heat exchange module 10, V5 located between the expansion turbine 7 and the intermediate low-temperature heat exchanger 6, V6 located between the intermediate regenerator 5 and the expansion turbine 7, V7 located between the intermediate regenerator 5 and the intermediate low-temperature heat exchanger 6, and V8 located between the intermediate low-temperature heat exchanger 6 and the intermediate high-temperature heat exchanger 2. Different modes are switched through the step-by-step electric bidirectional switching valve group. Multi-point temperature sensors are used to monitor the temperature in the system, bidirectional power grid acquisition module is used to monitor the power of the bidirectional generator integrated machine, and industrial load acquisition module is used to acquire the loads of the expansion turbine 7, the adiabatic compressor 3, and the bidirectional generator integrated machine in the system.

[0034] Furthermore, the circulation control within the system uses high-purity helium or a nitrogen-argon inert gas mixture.

[0035] Specifically, by using high-purity helium or a nitrogen-argon inert gas mixture, the entire process can maintain a pure gaseous state without phase change, stably achieving high-temperature heating at 600℃ and ensuring long-term stable high-temperature operation of the system.

[0036] In one embodiment, when applied to a large-scale wind and solar energy base, the circulating working fluid is high-purity helium, the system operating temperature range is 20–620°C, and the high-temperature output end stably provides a heat source of approximately 600°C. The molten salt tank 9 adopts one of the nitrate, chloride, or fluoride composite molten salt systems. The system can generate and store heat during off-peak hours at night or during periods of wind and solar power curtailment, and release heat to generate electricity during peak daytime hours. When applied to a low-cost industrial park, the circulating working fluid is nitrogen or a nitrogen-argon mixture. The pre-low-temperature heat absorber 1 is connected to kiln tail gas or process waste heat at 150–320°C, and the industrial multi-stage heat exchange module 10 supplies heat to building material kilns, metallurgical preheating furnaces, or chemical high-temperature heat-using equipment. While meeting the industrial heat load, the system utilizes surplus heat to store in the molten salt tank 9 and generates electricity during peak electricity prices or grid demand response periods.

[0037] A peak-shaving method for an electrothermal bidirectional coupling peak-shaving system includes: In the power-waste heating mode, the low-pressure circulating working fluid is controlled to pass through the low-temperature heat absorber 1 and the intermediate high-temperature heat exchanger 2 in sequence to raise its temperature, and then through the adiabatic compressor 3 to increase its pressure. It then enters the high-temperature heat exotherm 4. The heat output of the high-temperature heat exotherm 4 is distributed to one or two of the industrial multi-stage heat exchange module 10 and the molten salt tank 9. After the working fluid outputs heat, it enters the intermediate heat exchanger, the expansion turbine 7 and the intermediate low-temperature heat exchanger 6 to recover heat and pressure to do work. In peak power generation mode, one or two heating circulating working fluids from molten salt tank 9 or industrial multi-stage heat exchange module 10 are used to control the high-temperature and high-pressure working fluid to work through intermediate regenerator 5 and expansion turbine 7, and enable the bidirectional motor generator integrated machine to transmit electrical energy to the grid.

[0038] Furthermore, when switching modes, the loads of the adiabatic compressor 3 and the expansion turbine 7 are reduced to 20%-40% of their rated loads. Then, the operating status of the step-by-step electric bidirectional switching valve group and the bidirectional motor generator integrated machine are switched in the set sequence, and the load is increased to the target operating load according to the set slope.

[0039] Specifically, when switching operating modes, the PLC main controller reduces the load of the adiabatic compressor 3, the expansion turbine 7, and the bidirectional motor generator to 20%-40% of the rated load, so that the system temperature and pressure enter the switchable range. Then, it switches the step-by-step electric bidirectional switching valves V1-V8 and simultaneously switches the electric or generator state of the bidirectional motor generator. Finally, it increases the load to the target operating condition according to the preset power slope. Through the above steps, the system completes the switching between heating and power generation operating conditions without emptying the circulating working fluid or stopping the cooling. This invention automatically selects the operating mode according to the peak and valley conditions of the power grid and the industrial heat load conditions, and adopts a step-by-step switching strategy of "load reduction - valve group switching - power recovery" to effectively avoid sudden temperature and pressure shocks.

[0040] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. An electrothermal bidirectional coupling peak shaving system, characterized in that, It includes a coaxial reversible power unit, a three-stage cascade heat recovery unit, a pre-low temperature waste heat recovery unit, and a high-temperature zone heat exchange unit, wherein: The pre-low temperature waste heat recovery unit includes a low temperature heat absorber, which is used to recover preheat in the low temperature zone of the industrial park. The three-stage cascade regenerative heat exchanger includes an intermediate high-temperature heat exchanger, an intermediate regenerator, and an intermediate low-temperature heat exchanger. The coaxial reversible power main unit includes an adiabatic compressor, an expansion turbine, and a bidirectional motor generator integrated unit. The bidirectional motor generator integrated unit is connected to the adiabatic compressor and the expansion turbine for grid-connected power generation. The high-temperature heat exchange unit includes a high-temperature heat exchanger, which is used for heat exchange with the industrial park and the high-temperature molten salt zone. In the mode of power abandonment and heating, the low-pressure circulating working fluid passes through the low-temperature heat absorber, the intermediate high-temperature heat exchanger and the adiabatic compressor in sequence to compress and heat up, and then enters the high-temperature heat exotherm to distribute the heat output of the high-temperature heat exotherm to one or both of the industrial park and the high-temperature molten salt zone. After heat exchange, the circulating working fluid enters the intermediate heat exchanger, the expansion turbine and the intermediate low-temperature heat exchanger to recover heat and pressure to do work. In peak power generation mode, one or two heating circulating working fluids in industrial parks and high-temperature molten salt zones control the high-temperature and high-pressure working fluids to work through intermediate regenerators and expansion turbines, and enable bidirectional motor generators to transmit electrical energy to the grid.

2. The electrothermal bidirectional coupling peak shaving system of claim 1, wherein, The high-temperature heat exchange unit also includes a molten salt tank, which has a naturally stratified upper high-temperature molten salt heat storage zone, a middle transition zone, and a lower low-temperature molten salt buffer heat exchange zone.

3. The electrothermal bidirectional coupling peak shaving system of claim 2, wherein, The molten salt tank is equipped with two isolated, complementary, and non-connected heat exchange coils, each with a heat storage channel for heating and a heat release channel for power generation.

4. The electrothermal bidirectional coupling peak-shaving system according to claim 2, characterized in that, The high-temperature heat exchange unit also includes an industrial multi-stage heat exchange module, which includes a high-temperature kiln heat exchange branch, a steam generator branch, and a brine heat exchange branch arranged in parallel. The industrial multi-stage heat exchange module and the molten salt tank are connected to the high-temperature heat exchanger.

5. The electrothermal bidirectional coupling peak-shaving system according to claim 1, characterized in that, The coaxial reversible power main unit also includes a high-temperature gas path dynamic sealing assembly. The adiabatic compressor, the bidirectional motor generator integrated unit, and the expansion turbine are connected by a coaxial main shaft. The coaxial main shaft is provided with a high-temperature gas path dynamic sealing assembly at the connection points between the bidirectional motor generator integrated unit and the expansion turbine and between the bidirectional motor generator integrated unit and the adiabatic compressor.

6. The electrothermal bidirectional coupling peak-shaving system according to claim 1, characterized in that, The heat source side of the low-temperature heat absorber is connected to one or more of industrial exhaust gas, industrial cooling water, or low-grade waste gas, and is used to heat the low-pressure circulating working fluid.

7. The electrothermal bidirectional coupling peak-shaving system according to claim 1, characterized in that, It also includes a control unit, which includes a PLC main controller, a bidirectional power grid acquisition module connected to the bidirectional motor generator integrated machine, an industrial load acquisition module, a multi-point temperature sensor installed in the system, and a step-by-step electric bidirectional switching valve group installed in the system. The bidirectional motor generator integrated machine has power switching terminals.

8. The electrothermal bidirectional coupling peak-shaving system according to claim 1, characterized in that, The system's internal circulation control uses high-purity helium or a nitrogen-argon inert gas mixture.

9. A peak-shaving method applied to the electrothermal bidirectional coupling peak-shaving system as described in any one of claims 1-8, characterized in that, include: In the power-waste heating mode, the low-pressure circulating working fluid is controlled to pass through the low-temperature heat absorber and the intermediate high-temperature heat exchanger in sequence to raise the temperature, and then passes through the adiabatic compressor to increase the pressure. It then enters the high-temperature heat exotherm. The heat output of the high-temperature heat exotherm is distributed to one or two of the industrial multi-stage heat exchange modules and molten salt tanks. After the working fluid outputs heat, it enters the intermediate heat exchanger, the expansion turbine and the intermediate low-temperature heat exchanger to recover heat and pressure to do work. In peak power generation mode, one or two heating circulating working fluids from molten salt tanks or industrial multi-stage heat exchange modules are used to control the high-temperature and high-pressure working fluid to work through intermediate regenerators and expansion turbines, and enable the bidirectional motor generator to transmit electrical energy to the grid.

10. The electrothermal bidirectional coupling peak-shaving method according to claim 9, characterized in that, When switching modes, reduce the load of the adiabatic compressor and expansion turbine to 20%-40% of the rated load, then switch the operation status of the step electric bidirectional switching valve group and the bidirectional motor generator in the set sequence, and increase the load to the target working condition load according to the set slope.

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