Steam-driven heat pump heat storage system applied to peak regulation of thermal power generating unit

Abstract

The utility model provides a steam-driven heat pump heat storage system applied to peak regulation of a thermal power generating unit, a thermal power generating unit module is provided with a steam turbine assembly and a condenser, and a steam-driven Brayton cycle heat pump module is provided with a first heat exchanger, a second heat exchanger, a third heat exchanger and a heat pump sub-module. A steam pipeline of the first heat exchanger is connected with a driving steam turbine and a condenser, a cooling liquid pipeline of the second heat exchanger is connected with the condenser, and the heat storage module can achieve heat exchange operation with the third heat exchanger and the heat release heat exchanger. Redundant high-temperature and high-pressure steam in the steam turbine assembly drives the steam driving Brayton cycle heat pump module to absorb heat in high-temperature cooling water of a condenser and dead steam of a driving turbine, and the heat is stored in the heat storage module after being increased. Heat stored in the heat storage module generates high-temperature and high-pressure steam to drive the steam turbine assembly to achieve power generation operation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the thermal storage peak shaving technology field of thermal power generating unit, especially, relate to a steam drive heat pump heat storage system for thermal power generating unit peak shaving. BACKGROUND

[0002] Thermal power generating unit refers to a complete set of equipment and system for converting chemical energy of fossil fuel (such as coal, natural gas or oil) into electric energy, and through a series of physical and chemical processes, the energy of fuel is converted into usable electric energy efficiently, and provides power support for modern power system. Since the electricity consumption of residents and the electricity consumption of the tertiary industry have great time period use difference, that is, the electricity demand of residents and the tertiary industry has strong intraday volatility, so higher requirements are put forward for the flexible operation of thermal power generating unit.

[0003] However, under the prior art, the conventional thermal power generating unit is difficult to realize deep peak shaving of power generation load. UTILITY MODEL CONTENT

[0004] The utility model provides a steam drive heat pump heat storage system for thermal power generating unit peak shaving to solve the technical problem that the conventional thermal power generating unit is difficult to realize deep peak shaving of power generation load under the prior art.

[0005] To solve the above problems, the technical scheme of the utility model is as follows: a steam drive heat pump heat storage system for thermal power generating unit peak shaving, comprising: a thermal power generating unit module, a steam drive Brayton cycle heat pump module and a heat storage module.

[0006] The thermal power generating unit module is provided with a steam turbine assembly and a condenser, the steam turbine assembly is used for realizing heat energy-mechanical energy conversion through high-temperature high-pressure steam, and the condenser is used for heat exchanging the heat of the exhausted steam after work of the high-temperature high-pressure steam to high-temperature cooling liquid.

[0007] The steam drive Brayton cycle heat pump module is provided with a heat pump submodule, a first heat exchanger, a second heat exchanger and a third heat exchanger, the heat pump submodule comprises a drive steam turbine, a compressor and an expander, the drive steam turbine is drivingly connected with the compressor and the expander respectively, the steam pipeline inlet of the first heat exchanger is connected with the outlet of the drive steam turbine, and the steam pipeline outlet of the first heat exchanger is connected with the steam pipeline inlet of the condenser; the cooling liquid pipeline inlet of the second heat exchanger is connected with the cooling liquid pipeline outlet of the condenser.

[0008] Moreover, the heat exchange medium pipelines of the first heat exchanger, the compressor, the third heat exchanger, the expander and the second heat exchanger are communicated to form a heat exchange medium circulation loop.

[0009] The heat storage module is provided with a low-temperature heat storage tank and a high-temperature heat storage tank, and the low-temperature heat storage tank and the high-temperature heat storage tank store heat storage medium, and the heat storage module is coupled with the third heat exchanger and the steam turbine assembly to realize heat exchange operation.

[0010] A steam-driven heat pump heat storage system applied to peak shaving of a thermal power unit is configured to, when the thermal power unit module needs to reduce power generation load, drive the heat pump sub-module to operate by using the excess high-temperature and high-pressure steam in the steam turbine assembly, and transfer the heat of the steam after work to the storage module through the multi-stage heat exchanger; when the thermal power unit module needs to increase power generation load, the heat stored in the heat storage module can generate high-temperature and high-pressure steam to drive the steam turbine assembly to realize power generation operation.

[0011] Preferably, the steam turbine assembly comprises a high-pressure cylinder and a medium-pressure cylinder, the high-pressure cylinder and the medium-pressure cylinder are connected through a steam pipeline, the inlet of the high-pressure cylinder is communicated with the steam pipeline outlet of the heat storage module, and the outlet of the medium-pressure cylinder is connected with the inlet of the drive steam turbine.

[0012] Preferably, the inlet of the compressor is communicated with the outlet of the heat exchange medium pipeline of the first heat exchanger, the outlet of the compressor is connected with the inlet of the heat exchange medium pipeline of the third heat exchanger, and the compressor is used for compressing the heat exchange medium in the heat exchange medium circulation loop to increase the temperature of the heat exchange medium.

[0013] Preferably, the inlet of the expander is communicated with the outlet of the heat exchange medium pipeline of the third heat exchanger, the outlet of the expander is connected with the inlet of the heat exchange medium pipeline of the second heat exchanger, and the expander is used for expanding the heat exchange medium in the heat exchange medium circulation loop after the compression operation of the compressor to reduce the temperature of the heat exchange medium.

[0014] Preferably, the expander comprises a primary expander and a secondary expander, the inlet of the primary expander is communicated with the outlet of the heat exchange medium pipeline of the third heat exchanger, the outlet of the primary expander is connected with the inlet of the heat exchange medium pipeline of the second heat exchanger, the inlet of the secondary expander is connected with the outlet of the heat exchange medium pipeline of the second heat exchanger, and the outlet of the secondary expander is connected with the inlet of the heat exchange medium pipeline of the first heat exchanger.

[0015] Preferably, the drive steam turbine is drivingly connected with the compressor and the expander through a gear assembly, and the drive steam turbine is configured to drive the compressor and the expander to operate under the action of the high-temperature and high-pressure steam output by the medium-pressure cylinder, and output high-temperature and high-pressure exhaust steam to the steam pipeline of the first heat exchanger.

[0016] Preferably, the steam-driven Brayton cycle heat pump module is further provided with a regenerator, an inlet of a forward pipeline of the regenerator is connected with an outlet of the heat medium pipeline of the first heat exchanger, an outlet of the forward pipeline of the regenerator is connected with the inlet of the compressor, an inlet of a reverse pipeline of the regenerator is connected with an outlet of the heat medium pipeline of the third heat exchanger, and an outlet of the reverse pipeline of the regenerator is connected with the inlet of the expander.

[0017] The regenerator is configured to enable the heat medium flowing through the forward pipeline of the regenerator to absorb the residual heat of the heat medium in the reverse pipeline of the regenerator.

[0018] Preferably, the regenerator is a plate-fin heat exchanger.

[0019] Preferably, an inlet of the heat medium pipeline of the third heat exchanger is connected with the low-temperature heat storage tank, an outlet of the heat medium pipeline of the third heat exchanger is connected with the high-temperature heat storage tank, and the heat storage module is provided with a cold source pump body for extracting the low-temperature heat storage medium in the low-temperature heat storage tank after heat exchange through the third heat exchanger and then transmitting the low-temperature heat storage medium into the high-temperature heat storage tank.

[0020] Preferably, the heat storage module is further provided with a heat release heat exchanger, an inlet of the heat medium pipeline of the heat release heat exchanger is connected with the high-temperature heat storage tank, an outlet of the heat medium pipeline of the heat release heat exchanger is connected with the low-temperature heat storage tank, and an outlet of the steam pipeline of the heat release heat exchanger is connected with the inlet of the high-pressure cylinder; the heat storage module is further provided with a heat source pump body for extracting the high-temperature heat storage medium in the high-temperature heat storage tank after heat exchange through the heat release heat exchanger and then transmitting the high-temperature heat storage medium into the low-temperature heat storage tank.

[0021] Compared with the prior art, the technical scheme has the following advantages and positive effects:

[0022] (1) The steam-driven heat pump heat storage system applied to the peak regulation of the thermal power generating unit has the following advantages: when the thermal power generating unit needs to reduce the power generation load, the unit boiler can be maintained to operate at the minimum stable combustion load, and part of the excess high-temperature and high-pressure steam generated by the unit boiler is transmitted to the steam-driven Brayton cycle heat pump module to drive the heat pump sub-module to operate, so that the heat is transferred from the low-temperature heat source to the heat storage module for storage, the heat of part of the excess high-temperature and high-pressure steam is consumed, energy loss is avoided, and the power generation load is further reduced; when the thermal power generating unit needs to increase the power generation load, the heat storage module can generate high-temperature and high-pressure steam from the stored heat to drive the steam turbine assembly to operate, so as to generate additional electric power, thereby meeting the deep peak regulation function of the power generation load.

[0023] (2) The utility model provides a steam drive heat pump heat storage system applied to peak regulation of thermal power generating unit, be equipped with drive steam turbine, compressor and expander in heat pump submodule, drive steam turbine respectively with compressor and expander realize transmission connection through gear assembly, drive steam turbine adopts the surplus high temperature and high pressure steam of thermal power generating unit module output as power source, fully improves the resource utilization rate, and adopts motorless scheme, can effectively avoid the impact influence that large -scale motor starts and stops process causes to power grid, make the peak regulation process of thermal power generating unit more stable and safe. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The utility model provides a steam drive heat pump heat storage system applied to peak regulation of thermal power generating unit's first structure schematic diagram;

[0025] Figure 2 The utility model provides a steam drive heat pump heat storage system applied to peak regulation of thermal power generating unit's second structure schematic diagram.

[0026] The figure signification explains: 1: thermal power generating unit module; 2: heat storage module; 3: steam drive brayton cycle heat pump module; 4: medium pressure cylinder; 5: drive steam turbine; 6: first heat exchanger; 7: condenser; 8: compressor; 9: third heat exchanger; 10: regenerator; 11: expander; 12: second heat exchanger; 13: low temperature heat storage tank; 14: high temperature heat storage tank; 15: heat release heat exchanger; 16: high pressure cylinder; 17: heat pump submodule. DETAILED DESCRIPTION

[0027] The utility model provides a steam drive heat pump heat storage system applied to peak regulation of thermal power generating unit further in detail with the following attached drawing and specific embodiment is explained.According to the following explanation and claims, the advantages and features of the utility model will be more apparent.

[0028] Reference Figure 1 The utility model provides a steam drive heat pump heat storage system applied to peak regulation of thermal power generating unit, for enabling thermal power generating unit to realize deep peak regulation function when power load changes, improve energy utilization efficiency, reduce the peak regulation cost of thermal power generating unit.

[0029] Specifically, the steam drive heat pump heat storage system applied to peak regulation of thermal power generating unit provided by the utility model, the main part includes thermal power generating unit module 1, steam drive brayton cycle heat pump module 3 and heat storage module 2.

[0030] The thermal power generator set module 1 is provided with a steam turbine assembly and a condenser 7. The steam turbine assembly can input high-temperature and high-pressure steam. The high-temperature and high-pressure steam flows through the internal cavity of the steam turbine assembly and drives the internal blades of the steam turbine assembly to rotate. That is, the steam turbine assembly is used to realize heat-mechanical energy conversion through high-temperature and high-pressure steam. The condenser 7 is provided with a steam pipeline and a cooling liquid pipeline. The steam pipeline and the cooling liquid pipeline of the condenser 7 can realize heat exchange work. When the exhaust steam after the high-temperature and high-pressure steam does work through the heat pump sub-module 17 is input into the steam pipeline of the condenser 7, the heat of the exhaust steam after the high-temperature and high-pressure steam does work can be transferred to the cooling liquid in the cooling liquid pipeline. That is, the condenser 7 is used to exchange the remaining heat of the exhaust steam after the high-temperature and high-pressure steam does work to the cooling liquid, thereby generating high-temperature cooling liquid.

[0031] The steam-driven Brayton cycle heat pump module 3 is provided with a first heat exchanger 6, a second heat exchanger 12 and a third heat exchanger 9. The first heat exchanger 6 is provided with a steam pipeline and a heat exchange medium pipeline. The steam pipeline and the heat exchange medium pipeline of the first heat exchanger 6 can realize heat exchange work. That is, when the exhaust steam after the high-temperature and high-pressure steam does work flows through the steam pipeline of the first heat exchanger 6, the heat of the exhaust steam after the high-temperature and high-pressure steam does work can be transferred to the heat exchange medium in the heat exchange medium pipeline. Similarly, the second heat exchanger 12 is provided with a cooling liquid pipeline and a heat exchange medium pipeline. The cooling liquid pipeline and the heat exchange medium pipeline of the second heat exchanger 12 can realize heat exchange work. That is, when the high-temperature cooling liquid flows through the cooling liquid pipeline of the second heat exchanger 12, the heat of the high-temperature cooling liquid can be transferred to the heat exchange medium in the heat exchange medium pipeline. Similarly, the third heat exchanger 9 is provided with a heat exchange medium pipeline and a heat storage medium pipeline. The heat exchange medium pipeline and the heat storage medium pipeline of the third heat exchanger 9 can realize heat exchange work. That is, when the high-temperature heat exchange medium flows through the heat exchange medium pipeline of the third heat exchanger 9, the heat of the high-temperature heat exchange medium can be transferred to the heat storage medium in the heat storage medium pipeline.

[0032] The steam-driven Brayton cycle heat pump module 3 is further provided with a heat pump sub-module 17. The heat pump sub-module 17 includes a drive turbine 5, a compressor 8 and an expander 11. The drive turbine 5 is drivingly connected with the compressor 8 and the expander 11, respectively. In this embodiment, the excess high-temperature and high-pressure steam output by the steam turbine assembly can be first transmitted to the drive turbine 5, so as to drive the compressor 8 and the expander 11 to operate after the drive turbine 5 drives the compressor 8 and the expander 11 to operate. The exhaust steam after the drive turbine 5 does work is output from the outlet of the drive turbine 5. The compressor 8 and the expander 11 are both provided with a heat exchange medium pipeline for circulating heat exchange medium. The compressor 8 is used to compress the heat exchange medium flowing through the compressor 8, thereby increasing the temperature of the heat exchange medium. The expander 11 is used to expand the heat exchange medium flowing through the expander 11, so as to reduce the temperature and the air pressure of the heat exchange medium, which is beneficial to the heat exchange medium to fully absorb the heat of the high-temperature and high-pressure steam again in the subsequent process, thereby realizing the function of cyclic transfer of heat.

[0033] Meanwhile, the steam-driven Brayton cycle heat pump module 3 is also provided with a regenerator 10, the regenerator 10 is provided with a forward pipeline and a reverse pipeline, the forward pipeline and the reverse pipeline of the regenerator 10 can realize heat exchange operation, that is, the heat of the heat exchange medium in the reverse pipeline of the regenerator 10 can be transferred to the heat exchange medium in the forward pipeline thereof.

[0034] In the embodiment, the steam pipeline inlet of the first heat exchanger 6 is communicated with the outlet of the driving steam turbine 5, the steam pipeline outlet of the first heat exchanger 6 is connected with the steam pipeline inlet of the condenser 7, the cooling liquid pipeline inlet of the second heat exchanger 12 is connected with the cooling liquid pipeline outlet of the condenser 7, the heat exchange medium pipeline outlet of the first heat exchanger 6 is connected with the forward pipeline inlet of the regenerator 10, the forward pipeline outlet of the regenerator 10 is connected with the inlet of the compressor 8, the outlet of the compressor 8 is connected with the heat exchange medium pipeline inlet of the third heat exchanger 9, the heat exchange medium pipeline outlet of the third heat exchanger 9 is connected with the reverse pipeline inlet of the regenerator 10, the reverse pipeline outlet of the regenerator 10 is connected with the inlet of the expander 11, the outlet of the expander 11 is connected with the heat exchange medium pipeline inlet of the second heat exchanger 12, and finally, the heat exchange medium pipeline outlet of the second heat exchanger 12 is connected with the heat exchange medium pipeline inlet of the first heat exchanger 6. That is, in the embodiment, the first heat exchanger 6, the regenerator 10, the compressor 8, the third heat exchanger 9, the expander 11 and the second heat exchanger 12 form a heat exchange medium circulation loop, which is used to realize the circulation and heat transfer functions of the heat exchange medium.

[0035] The heat storage module 2 is provided with a low-temperature heat storage tank 13 and a high-temperature heat storage tank 14, the low-temperature heat storage tank 13 and the high-temperature heat storage tank 14 store heat storage medium, the heat storage medium circulates through the heat storage medium pipeline in the heat storage module 2, and the heat storage module 2 is coupled with the third heat exchanger 9 and the steam turbine assembly and can realize heat exchange operation.

[0036] In the present embodiment, when the thermal power generating unit module 1 needs to reduce the power generation load, part of the excess high-temperature and high-pressure steam in the steam turbine assembly can be extracted. The high-temperature and high-pressure steam first passes through the drive turbine 5 to do work, and then the high-temperature and high-pressure exhaust steam output by the drive turbine 5 passes through the first heat exchanger 6. At this time, the heat of the high-temperature and high-pressure steam after work is transferred to the heat exchange medium, and then the high-temperature and high-pressure steam after work passes through the condenser 7 to transfer the remaining heat of the high-temperature and high-pressure steam after work to the cooling liquid. Finally, the high-temperature cooling liquid flows through the second heat exchanger 12. From the heat exchange path of the heat exchange medium in the heat exchange medium circulation loop, the heat exchange medium first flows through the second heat exchanger 12, and the heat exchange medium and the high-temperature cooling liquid realize the first heat exchange, and the temperature of the heat exchange medium rises. Then the heat exchange medium flows through the first heat exchanger 6, and the heat exchange medium and the high-temperature and high-pressure steam after work realize the second heat exchange, and the temperature of the heat exchange medium further rises. Then the heat exchange medium flows through the forward pipeline of the regenerator 10, and the heat exchange medium and the remaining heat of the heat exchange medium in the reverse pipeline of the regenerator 10 realize the third heat exchange, and the temperature of the heat exchange medium further rises. Then the heat exchange medium flows through the compressor 8, and the temperature of the heat exchange medium further rises after being compressed. Finally, the high-temperature heat exchange medium flows through the third heat exchanger 9, and the high-temperature heat exchange medium and the low-temperature heat storage medium in the heat storage module 2 realize the fourth heat exchange, and the temperature of the heat exchange medium decreases. After the heat exchange medium is output from the third heat exchanger 9, it first reversely flows into the reverse pipeline of the regenerator 10 to transfer its remaining heat to the heat exchange medium in the forward pipeline of the regenerator 10 to realize the fifth heat exchange. Then the heat exchange medium flows back to the expander 11 to do work, and the temperature of the expanded heat exchange medium further decreases, and at the same time the pressure decreases. Finally, the heat exchange medium flows back to the second heat exchanger 12 again to complete one cycle of the heat exchange medium. That is, in the present embodiment, the heat exchange medium continuously realizes heat circulation along the heat exchange medium circulation loop, and the low-grade heat of the high-temperature and high-pressure steam after work in the steam turbine assembly is improved and transferred to the heat storage module 2. Thus, by consuming part of the high-temperature and high-pressure steam in the steam turbine assembly, the power generation load is further reduced to meet the deep peak shaving demand of the power grid.

[0037] When the thermal power generating unit module 1 needs to increase the power generation load, the heat stored in the heat storage module 2 will be transferred to the steam turbine assembly to generate additional high-temperature and high-pressure steam for the steam turbine assembly to realize power generation operation to produce additional power to achieve the purpose of peak operation.

[0038] In summary, the present embodiment provides a steam-driven heat pump heat storage system applied to thermal power unit peak shaving, which can realize deep peak shaving of the power generation load of the thermal power unit, fully realize energy utilization, reduce the peak shaving cost of the thermal power unit, and avoid the impact of the sudden start and shutdown of large-scale thermal power units on the power grid, effectively improving the flexibility and safety of the use of the thermal power unit.

[0039] In the following, the specific structure and functions of a steam-driven heat pump heat storage system applied to the peak shaving of a thermal power unit provided by the present embodiment will be described in further detail.

[0040] Preferably, in the present embodiment, the steam turbine assembly includes a high-pressure cylinder 16 and a medium-pressure cylinder 4, the outlet of the high-pressure cylinder 16 is connected to the inlet of the medium-pressure cylinder 4 through a steam pipeline, and the inlet of the high-pressure cylinder 16 is in communication with the steam pipeline outlet of the heat storage module 2, and the outlet of the medium-pressure cylinder 4 is in communication with the steam pipeline inlet of the first heat exchanger 6. In the present embodiment, the high-temperature and high-pressure steam enters the steam turbine assembly, sequentially flows through the high-pressure cylinder 16 and the medium-pressure cylinder 4, and drives the blades in the high-pressure cylinder 16 and the medium-pressure cylinder 4 to rotate. Finally, part of the excess high-temperature and high-pressure steam from the high-temperature and high-pressure steam after the steam turbine assembly completes the driving operation is extracted and transmitted to the first heat exchanger 6, thereby realizing the further reduction of the power generation load of the thermal power generator module 1 by absorbing part of the excess high-temperature and high-pressure steam while maintaining the minimum stable combustion load of the thermal power unit.

[0041] Preferably, in the present embodiment, the heat exchange medium can be selected as air or carbon dioxide gas.

[0042] Preferably, referring to Figure 2 In an embodiment, the expander 11 includes a primary expander and a secondary expander, the inlet of the primary expander is in communication with the reverse pipeline outlet of the heat regenerator 10, the outlet of the primary expander is connected to the heat exchange medium pipeline inlet of the second heat exchanger 12, the inlet of the secondary expander is connected to the heat exchange medium pipeline outlet of the second heat exchanger 12, and the outlet of the secondary expander is connected to the heat exchange medium pipeline inlet of the first heat exchanger 6. In the present embodiment, the two-stage expansion operation of the expander 11 can improve the cycle efficiency of the heat pump.

[0043] Preferably, in the present embodiment, the inlet of the drive turbine 5 is connected to the outlet of the medium-pressure cylinder 4, the outlet of the drive turbine 5 is connected to the steam pipeline inlet of the first heat exchanger 6, and the drive turbine 5 is drivingly connected to the compressor 8 and the expander 11 through a gear assembly. In the present embodiment, the high-temperature and high-pressure steam output by the medium-pressure cylinder 4 first flows through the drive turbine 5, the drive turbine 5 is driven to enable the compressor 8 to operate, and finally the drive turbine 5 outputs the high-temperature and high-pressure exhaust steam after work to the steam pipeline of the first heat exchanger 6. As can be seen, in the present embodiment, the heat pump sub-module 17 does not have a motor device, the operation power of the compressor 8 comes from the excess high-temperature and high-pressure steam output by the steam turbine assembly and the expander 11, i.e. the operation of the compressor 8 no longer consumes additional electric power resources, further reducing the cost of peak shaving of the thermal power unit, and at the same time, the impact of large motors on the power grid during start-stop process can be avoided.

[0044] Preferably, in the embodiment, the regenerator 10 can adopt a plate-fin heat exchanger to enhance the heat transfer efficiency of the regenerator 10, so that the regenerator 10 can fully absorb the residual heat of the heat transfer medium in the reverse pipeline.

[0045] Preferably, in the embodiment, the regenerator 10 can adopt a plate-fin heat exchanger to enhance the heat transfer efficiency of the regenerator 10, so that the regenerator 10 can fully absorb the residual heat of the heat transfer medium in the reverse pipeline.

[0046] Preferably, in the embodiment, the regenerator 10 can adopt a plate-fin heat exchanger to enhance the heat transfer efficiency of the regenerator 10, so that the regenerator 10 can fully absorb the residual heat of the heat transfer medium in the reverse pipeline.

[0047] It is worth mentioning that the utility model certainly includes necessary pipeline, conventional valve, oxygen removal device and general pump body and other equipment for realizing process integrity, but the above content does not belong to the main invention point of the utility model, and the person skilled in the art can add layout based on process flow and equipment structure selection, and the embodiment will not be limited specifically.

[0048] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments. Even if various changes are made to the utility model, if the changes belong to the range of the utility model claims and equivalent technologies, they still fall within the protection scope of the utility model.

Claims

1. A steam-driven heat pump thermal storage system for peak shaving in thermal power units, characterized in that, include: Thermal power generator module, steam-driven Brayton cycle heat pump module and thermal storage module; The thermal power generator module is equipped with a steam turbine assembly and a condenser. The steam turbine assembly is used to convert thermal energy into mechanical energy through high-temperature and high-pressure steam. The condenser is used to transfer the heat of the exhaust steam after the high-temperature and high-pressure steam has done work to the high-temperature coolant. The steam-driven Brayton cycle heat pump module includes a heat pump submodule, a first heat exchanger, a second heat exchanger, and a third heat exchanger. The heat pump submodule includes a drive turbine, a compressor, and an expander. The drive turbine is connected to the compressor and the expander respectively. The steam inlet of the first heat exchanger is connected to the outlet of the drive turbine, and the steam outlet of the first heat exchanger is connected to the steam inlet of the condenser. The coolant inlet of the second heat exchanger is connected to the coolant outlet of the condenser. Furthermore, the heat exchange medium pipelines of the first heat exchanger, the compressor, the third heat exchanger, the expander, and the second heat exchanger are connected to form a heat exchange medium circulation loop; The heat storage module is equipped with a low-temperature heat storage tank and a high-temperature heat storage tank. The low-temperature heat storage tank and the high-temperature heat storage tank store heat storage medium. The heat storage module is coupled with the third heat exchanger and the steam turbine assembly to realize heat exchange operation. A steam-driven heat pump thermal storage system for peak shaving in thermal power units is configured such that when the thermal power generating unit module needs to reduce its power generation load, the excess high-temperature and high-pressure steam in the steam turbine assembly drives the heat pump submodule to operate, and the heat of the exhaust steam after the excess high-temperature and high-pressure steam has done work is transferred and stored in the thermal storage module through a multi-stage heat exchanger; when the thermal power generating unit module needs to increase its power generation load, the heat stored in the thermal storage module can generate high-temperature and high-pressure steam to drive the steam turbine assembly to achieve power generation.

2. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 1, characterized in that, The steam turbine assembly includes a high-pressure cylinder and an intermediate-pressure cylinder, which are connected by a steam pipeline. The inlet of the high-pressure cylinder is connected to the steam pipeline outlet of the thermal storage module, and the outlet of the intermediate-pressure cylinder is connected to the inlet of the drive turbine.

3. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 2, characterized in that, The compressor inlet is connected to the heat exchange medium pipeline outlet of the first heat exchanger, and the compressor outlet is connected to the heat exchange medium pipeline inlet of the third heat exchanger. The compressor is used to compress the heat exchange medium in the heat exchange medium circulation loop and increase the temperature of the heat exchange medium.

4. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 3, characterized in that, The inlet of the expander is connected to the outlet of the heat exchange medium pipeline of the third heat exchanger, and the outlet of the expander is connected to the inlet of the heat exchange medium pipeline of the second heat exchanger. The expander is used to expand the heat exchange medium in the heat exchange medium circulation loop after being compressed by the compressor, thereby reducing the temperature of the heat exchange medium.

5. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 4, characterized in that, The expander includes a primary expander and a secondary expander. The inlet of the primary expander is connected to the outlet of the heat exchange medium pipeline of the third heat exchanger, and the outlet of the primary expander is connected to the inlet of the heat exchange medium pipeline of the second heat exchanger. The inlet of the secondary expander is connected to the outlet of the heat exchange medium pipeline of the second heat exchanger, and the outlet of the secondary expander is connected to the inlet of the heat exchange medium pipeline of the first heat exchanger.

6. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 4, characterized in that, The drive turbine is connected to the compressor and the expander via gear assemblies. The drive turbine is configured to drive the compressor and the expander under the action of the high-temperature and high-pressure steam output from the intermediate-pressure cylinder, and output high-temperature and high-pressure exhaust steam to the steam pipeline of the first heat exchanger.

7. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 6, characterized in that, The steam-driven Brayton cycle heat pump module is also equipped with a regenerator. The forward pipeline inlet of the regenerator is connected to the heat exchange medium pipeline outlet of the first heat exchanger, the forward pipeline outlet of the regenerator is connected to the inlet of the compressor, the reverse pipeline inlet of the regenerator is connected to the heat exchange medium pipeline outlet of the third heat exchanger, and the reverse pipeline outlet of the regenerator is connected to the inlet of the expander. The regenerator is configured such that the heat exchange medium flowing through the forward conduit of the regenerator absorbs the residual heat of the heat exchange medium in its reverse conduit.

8. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 7, characterized in that, The regenerator is a plate-fin heat exchanger.

9. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 1, characterized in that, The inlet of the heat storage medium pipeline of the third heat exchanger is connected to the low-temperature heat storage tank, and the outlet of the heat storage medium pipeline of the third heat exchanger is connected to the high-temperature heat storage tank. The heat storage module is equipped with a cold source pump body, which is used to extract the low-temperature heat storage medium in the low-temperature heat storage tank and transfer it to the high-temperature heat storage tank after heat exchange operation of the third heat exchanger.

10. The steam-driven heat pump thermal storage system for peak shaving in thermal power units as described in claim 9, characterized in that, The heat storage module is also equipped with a heat release heat exchanger. The inlet of the heat release heat exchanger's heat storage medium pipeline is connected to the high-temperature heat storage tank, the outlet of the heat release heat exchanger's heat storage medium pipeline is connected to the low-temperature heat storage tank, and the outlet of the heat release heat exchanger's steam pipeline is connected to the inlet of the high-pressure cylinder. The heat storage module is also equipped with a heat source pump body, which is used to draw high-temperature heat storage medium from the high-temperature heat storage tank and transfer it to the low-temperature heat storage tank after heat exchange through the heat release heat exchanger.

Images