Energy island system, control method, computer device and storage medium

Abstract

The present application relates to an energy island system, a control method, a computer device and a storage medium. The system comprises a power generation module, a heat exchange module, a compression and expansion module, a cold storage / release module, and a heat storage / release module, wherein the power generation module utilizes ocean thermal energy for power generation; the compression and expansion module is electrically connected to the power generation module, and is connected to the heat exchange module by means of a pipeline, so as to compress and / or expand a heat exchange circulating working medium, which circulates in pipelines of the compression and expansion module and the power generation module; the heat exchange module is connected to the power generation module, the cold storage / release module and the heat storage / release module by means of pipelines; the cold storage / release module stores surplus generated power in the form of cold energy during off-peak power consumption periods, and releases the cold energy during peak power consumption periods; and the heat storage / release module stores surplus generated power in the form of thermal energy during off-peak power consumption periods, and releases the thermal energy during peak power consumption periods. The energy island system of the present application utilizes stable and abundant ocean thermal energy for power generation, thereby enabling long-term and energy-efficient continuous operation.

Description

Energy island system, control methods, computer equipment and storage media Technical Field

[0001] This application relates to the field of marine engineering technology, and in particular to an energy island system, control method, computer equipment and storage medium. Background Technology

[0002] Against the backdrop of rapid global economic development, people's demand for energy is increasing. However, traditional fossil fuels face problems such as limited total supply and environmental pollution. The ocean covers 70% of the Earth's surface and possesses abundant renewable energy resources. The development of ocean energy has become one of the important directions for energy transformation. Offshore energy islands and deep-sea isolated islands have become springboards and outposts for exploring ocean energy.

[0003] Currently, most multi-energy coupling systems on offshore energy islands rely primarily on offshore wind and solar energy, making them highly susceptible to weather conditions and environmental factors. Furthermore, some systems are not entirely independent and still require the assistance of industrial waste heat or flue gas from thermal power plants. In contrast, ocean thermal energy is stable and abundant, making the construction of multi-level energy utilization and long-term energy-saving offshore energy island systems using ocean thermal energy a pressing need. Summary of the Invention

[0004] Therefore, it is necessary to provide an energy island system, control method, computer equipment, and storage medium that can perform multi-level energy utilization and long-term energy saving, in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides an energy island system, including a power generation module, a heat exchange module, a compression and expansion module, a cold storage / cooling module, and a heat storage / cooling module;

[0006] The power generation module is used to generate electricity using the temperature difference between seawater and the ocean.

[0007] The compression expansion module is electrically connected to the power generation module and is also connected to the heat exchange module through pipelines. It is used to compress and / or expand the heat exchange circulating working fluid. The heat exchange circulating working fluid is used to circulate in the pipelines of the compression expansion module and the power generation module.

[0008] The heat exchange module is connected to the power generation module, the cold storage / release module, and the heat storage / release module via pipelines. The cold storage / release module is used to store excess power generation as cold energy during off-peak hours and release cold energy during peak hours. The cold storage / release module is used to store excess power generation as heat energy during off-peak hours and release heat energy during peak hours.

[0009] In one embodiment, the heat exchange module includes a first heat exchange unit, a second heat exchange unit, a third heat exchange unit, a fourth heat exchange unit, a fifth heat exchange unit, and a circulating air source; wherein,

[0010] One end of the first heat exchange pipe of the first heat exchange unit is connected to the other end of the second heat exchange pipe of the second heat exchange unit, the other end of the first heat exchange pipe of the third heat exchange unit, and the other end of the second heat exchange pipe of the fourth heat exchange unit via pipes respectively; the other end of the first heat exchange pipe of the first heat exchange unit is connected to the circulating gas source; an air filling regulating valve is also provided on the connecting pipe between the other end of the first heat exchange pipe of the first heat exchange unit and the circulating gas source; the circulating gas source stores the heat exchange circulating working fluid;

[0011] The other end of the second heat exchange pipeline of the second heat exchange unit is connected to the other end of the first heat exchange pipeline of the third heat exchange unit and the other end of the second heat exchange pipeline of the fourth heat exchange unit through pipelines respectively.

[0012] One end of the first heat exchange pipe of the third heat exchange unit is connected to the other end of the first heat exchange pipe of the fourth heat exchange unit and the other end of the second heat exchange pipe of the fourth heat exchange unit via pipes; the other end of the first heat exchange pipe of the third heat exchange unit is connected to the other end of the first heat exchange pipe of the fourth heat exchange unit and the other end of the second heat exchange pipe of the fourth heat exchange unit via pipes; a second regulating valve is provided at one end of the second heat exchange pipe of the third heat exchange unit.

[0013] One end of the first heat exchange pipeline of the fourth heat exchange unit is connected to the other end of the first heat exchange pipeline of the fifth heat exchange unit through a pipeline.

[0014] A first regulating valve is also installed on the connecting pipe at the other end of the first heat exchange pipe of the second heat exchange unit.

[0015] In one embodiment, the cold storage / release module includes a medium-temperature cold storage unit and a low-temperature cold storage unit, and the heat storage / release module includes a medium-temperature heat storage unit and a high-temperature heat storage unit; wherein...

[0016] One end of the second heat exchange pipeline of the first heat exchange unit is connected to the first end of the medium-temperature cold storage unit through a pipeline, and the other end of the second heat exchange pipeline of the first heat exchange unit is connected to one end of the low-temperature cold storage unit and the second end of the medium-temperature cold storage unit through pipelines respectively.

[0017] One end of the first heat exchange pipeline of the fifth heat exchange unit is connected to the first end of the medium-temperature thermal storage unit and the other end of the high-temperature thermal storage unit through a pipeline; the other end of the first heat exchange pipeline of the fifth heat exchange unit is connected to the second end of the medium-temperature thermal storage unit through a pipeline.

[0018] In one embodiment, the cold storage / release module further includes a cold energy heat exchange unit; the heat storage / release module further includes a heat energy heat exchange unit;

[0019] One end of the first heat exchange pipe of the cold energy heat exchange unit is connected to the other end of the low temperature energy storage unit; the other end of the first heat exchange pipe of the cold energy heat exchange unit is connected to the third end of the medium temperature energy storage unit.

[0020] One end of the second heat exchange pipe of the heat energy heat exchange unit is connected to the third end of the medium-temperature energy storage unit; the other end of the second heat exchange pipe of the heat energy heat exchange unit is connected to one end of the high-temperature energy storage unit.

[0021] In one embodiment, the compression-expansion module further includes a first compression unit, a second compression unit, a first expansion unit, a second expansion unit, a drive unit, and a power generation unit; wherein,

[0022] One end of the first compression unit is connected to one end of the second heat exchange pipeline of the fifth heat exchange unit via a pipeline; the other end of the first compression unit is connected to one end of the second heat exchange pipeline of the fourth heat exchange unit.

[0023] One end of the first expansion unit is connected to the other end of the first heat exchange pipeline of the third heat exchange unit and the other end of the first heat exchange pipeline of the fourth heat exchange unit through a pipeline; the other end of the first expansion unit is connected to the other end of the first heat exchange pipeline of the first heat exchange unit through a pipeline; a first one-way valve is provided on the pipeline connected to the other end of the first expansion unit so that the heat exchange circulating working fluid flows out from the other end of the first expansion unit.

[0024] One end of the second compression unit is connected via a pipeline to the other end of the first heat exchange pipeline of the third heat exchange unit and the other end of the first heat exchange pipeline of the fourth heat exchange unit; the other end of the second compression unit is connected via a pipeline to the other end of the first heat exchange pipeline of the first heat exchange unit.

[0025] One end of the second expansion unit is connected to one end of the second heat exchange pipeline of the fifth heat exchange unit through a pipeline; the other end of the second expansion unit is connected to one end of the second heat exchange pipeline of the fourth heat exchange unit through a pipeline; a second one-way valve is installed on the pipeline connected to the other end of the second expansion unit so that the heat exchange circulating working fluid flows out from the other end of the second expansion unit.

[0026] The drive unit is electrically connected to the power output terminal of the power generation module, and the power output terminal of the drive unit is connected to the first compression unit. The drive unit is used to drive the first compression unit to compress the heat exchange cycle working fluid by utilizing the excess power generated by the power generation module.

[0027] The first compression unit is connected to the first expansion unit via a coupling, and the second expansion unit is connected to the second compression unit via a coupling; the power generation unit is connected to the second expansion unit to generate electricity by utilizing the second expansion unit.

[0028] In one embodiment, the power generation module includes a condensation heat exchange unit, an evaporation heat exchange unit, a cold water pump, a warm water pump, a circulating working fluid pump, a turbine, a first power generation circulation branch, a second power generation circulation branch, and a generator; wherein,

[0029] The cold water pump is connected to the other end of the second heat exchange pipeline of the condensation heat exchange unit through a pipeline; the warm water pump is connected to one end of the first heat exchange pipeline of the evaporation heat exchange unit through a pipeline.

[0030] One end of the first heat exchange pipe of the condensing heat exchange unit is connected to one end of the second heat exchange pipe of the evaporating heat exchange unit through a pipe via a first power generation circulation branch; the other end of the second heat exchange pipe of the evaporating heat exchange unit is connected to one end of the turbine through a pipe, and the other end of the turbine is connected to the other end of the first heat exchange pipe of the condensing heat exchange unit through a second power generation circulation branch; the first power generation circulation branch is equipped with a circulating working fluid pump; the turbine shaft is connected to a generator.

[0031] One end of the first heat exchange pipe of the condensing heat exchange unit is connected to one end of the first heat exchange pipe of the second heat exchange unit; the other end of the first heat exchange pipe of the condensing heat exchange unit is connected to the other end of the first heat exchange pipe of the second heat exchange unit.

[0032] One end of the second heat exchange pipe of the evaporation heat exchange unit is connected to one end of the second heat exchange pipe of the third heat exchange unit; the other end of the second heat exchange pipe of the evaporation heat exchange unit is connected to the other end of the second heat exchange pipe of the third heat exchange unit.

[0033] Secondly, this application also provides an energy island control method, applied to the energy island system as described in the first aspect; the method includes:

[0034] If it is during off-peak electricity hours, follow these steps:

[0035] Disconnect the pipeline connections between the heat exchange module and the power generation module, between the heat exchange module and the cold storage / cooling module, and between the heat exchange module and the heat storage / cooling module;

[0036] The excess power generated by the power generation module is used to drive the compression and expansion module to compress and expand the heat exchange circulating medium.

[0037] If the heat exchange working fluid meets the preset temperature conditions, the pipeline connection between the heat exchange module and the power generation module, and / or the heat exchange module and the storage / release module, and / or the heat exchange module and the storage / release module will be restored to store the excess power generation in the form of heat and / or cold energy.

[0038] In one embodiment, the method further includes:

[0039] If it is during the preset peak electricity consumption period, then perform the following steps:

[0040] Activate the cold storage / release module and the heat storage / release module to release the stored cold and heat energy;

[0041] Based on the released cold and heat energy, the compression and expansion module generates electricity.

[0042] The power generated by the compression expansion module and the thermoelectric power generated by the power generation module are connected to the grid for output.

[0043] Thirdly, this application also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described in the second aspect.

[0044] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the second aspect.

[0045] The aforementioned energy island system includes a power generation module, a heat exchange module, a compression and expansion module, a cold storage / release module, and a heat storage / release module. The power generation module utilizes seawater temperature difference energy to generate electricity. The compression and expansion module is electrically connected to the power generation module and connected to the heat exchange module via pipelines, used to compress and / or expand the heat exchange circulating medium. The heat exchange circulating medium circulates within the pipelines of the compression and expansion module and the power generation module. The heat exchange module is connected to the power generation module, the cold storage / release module, and the heat storage / release module via pipelines. The cold storage / release module stores excess power generation as cold energy during off-peak hours and releases cold energy during peak hours. The cold storage / release module stores excess power generation as heat energy during off-peak hours and releases heat energy during peak hours. The energy island of this application can generate electricity using stable and abundant seawater temperature difference energy and can operate continuously with long-term energy efficiency. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 is a structural block diagram of an energy island system in one embodiment;

[0048] Figure 2 is a schematic diagram of an energy island system structure in one embodiment;

[0049] Figure 3 is a schematic diagram of the piping structure of the heat exchange unit shown in Figure 2, drawn horizontally.

[0050] Figure 4 is a schematic diagram of the piping structure of the heat exchange unit shown in Figure 2, drawn vertically.

[0051] Figure 5 is a schematic diagram of an energy island system structure with sensor locations specifically set in one embodiment;

[0052] Figure 6 illustrates an energy island control method during off-peak electricity consumption periods in one embodiment;

[0053] Figure 7 illustrates an energy island control method during peak electricity consumption periods in one embodiment. Detailed Implementation

[0054] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0056] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0057] Spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, an element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0058] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0059] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0060] It is important to note that the term "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. For instance, the cold storage / release module described in this application represents a module capable of storing or releasing cold energy. The character " / " in the cold storage / release module table indicates that the module can perform the function of storing or releasing cold energy.

[0061] In one embodiment, as shown in FIG1, this application provides an energy island system 100, including a power generation module 101, a heat exchange module 103, a compression and expansion module 105, a cold storage / cooling module 109, and a heat storage / cooling module 107.

[0062] The power generation module 101 is used to generate electricity using the temperature difference between seawater and ocean water.

[0063] The compression expansion module 105 is electrically connected to the power generation module 101 and is connected to the heat exchange module 103 through a pipeline, and is used to compress and / or expand the heat exchange circulating working fluid; wherein, the heat exchange circulating working fluid is used to circulate in the pipeline between the compression expansion module 105 and the power generation module 101.

[0064] The heat exchange module 103 is connected to the power generation module 101, the cold storage / release module 109, and the heat storage / release module 107 via pipelines. The cold storage / release module 109 is used to store excess power generation in the form of cold energy during off-peak hours and to release cold energy during peak hours. The cold storage / release module 109 is used to store excess power generation in the form of heat energy during off-peak hours and to release heat energy during peak hours.

[0065] Ocean thermal energy conversion (OTEC) generates electricity by utilizing the temperature difference between the surface and deep ocean waters. It can be understood that shallow ocean waters are warmer due to direct solar radiation, while deep ocean waters are cooler due to their distance from solar radiation. Based on this temperature difference, electricity can be generated through the thermodynamic cycle of the corresponding working fluid. For example, the power generation module 101 can utilize OTEC to generate electricity based on an open-loop system, a closed-loop system, or a hybrid system. It should be understood that during off-peak electricity demand periods, the power generation module 101 will generate excess electricity beyond meeting the user's power needs. This excess electricity can be used to drive the compression and expansion module 105 for energy storage.

[0066] The compression-expansion module 105 is connected to the heat exchange module 103 via a pipeline and is used to compress and / or expand the heat exchange working fluid circulating in the pipeline. It is understood that the compression-expansion module 105 can compress the gas to a smaller volume by doing work, while simultaneously increasing the internal energy of the gas molecules in the heat exchange working fluid within the compression-expansion module 105, thereby raising the temperature of the heat exchange working fluid. On the other hand, when the heat exchange working fluid expands through the compression-expansion module 105, it does work on the surroundings, resulting in a decrease in the internal energy of the heat exchange working fluid and a decrease in its temperature. By using the compression and / or expansion operation of the heat exchange working fluid through the compression-expansion module 105, the temperature of the heat exchange working fluid in the pipeline can be regulated. For example, during periods of low electricity demand, the excess electricity generated by the power generation module 101 can drive the compression and expansion module 105 to compress and heat up / or expand and cool down the heat exchange circulating working fluid, thereby converting the excess electricity into internal energy (cold energy / heat energy) in the heat exchange circulating working fluid, which can then be further stored through the cold storage / cooling release module 109 and the heat storage / cooling release module 107. During periods of high electricity demand, the cold energy and / or heat energy in the cold storage / cooling release module 109 and the heat storage / cooling release module 107 can be transferred to the heat exchange circulating working fluid through heat exchange, and the heat exchange circulating working fluid can perform work when it expands to drive the engine to generate electricity.

[0067] The heat exchange module 103 is connected to the power generation module 101, the compression and expansion module 105, the cold storage / release module 109, and the heat storage / release module 107 via pipelines. It can be understood that the heat exchange process between the heat exchange module 103 and the power generation module 101, compression and expansion module 105, cold storage / release module 109, and heat storage / release module 107 can be based on different heat exchange working fluids in the different modules. For example, the cold storage / release module 109 may include a cold storage working medium that exchanges heat with the heat exchange cycle working medium, which can be used to store the excess power generated by the power generation module 101 in the form of cold energy; the heat storage / release module 107 may include a heat storage working medium that exchanges heat with the heat exchange cycle working medium, which can be used to store the excess power generated by the power generation module 101 in the form of cold and hot energy; the power generation module 101 may include a power generation cycle working medium for generating electricity from seawater temperature difference, which can also be used to exchange heat with the heat exchange cycle working medium to raise or lower the temperature of the power generation cycle working medium through the heat exchange process.

[0068] Specifically, the power generation module 101 utilizes the temperature difference between warm shallow seawater and deep cold seawater to generate electricity from seawater temperature difference. During peak electricity consumption periods, the power generation module 101 can generate excess power, which can be used to drive the compression and expansion module 105 to compress and / or expand the heat exchange circulating working fluid in the pipeline. This converts the excess power generated by the power generation module 101 into internal energy (cold energy / heat energy) in the heat exchange circulating working fluid through the compression and expansion module 105. Then, through heat exchange between the heat exchange circulating working fluid and the cold storage working fluid, the internal energy in the heat exchange circulating working fluid is transferred to the cold storage / release module 109 for storage, and / or, through heat exchange between the heat exchange circulating working fluid and the heat storage working fluid, the internal energy in the heat exchange circulating working fluid is transferred to the heat storage / release module 107 for storage. This achieves the storage of the excess power generated by the power generation module 101 in the form of internal energy of the heat exchange working fluid in the cold storage / release module 109 and / or the heat storage / release module 107.

[0069] During peak electricity consumption periods, the cold energy storage / release module 109 can transfer cold energy from the heat exchanger to the cold energy storage working medium through heat exchange with the heat exchanger working medium, and / or the heat energy storage / release module 107 can transfer heat energy from the heat exchanger to the heat exchanger working medium through heat exchange with the heat storage working medium, thereby adjusting the temperature of the heat exchanger working medium so that it can compress and expand based on the released cold energy and / or heat energy, ultimately driving the engine to generate electricity.

[0070] Furthermore, during peak electricity consumption periods, the heat exchange working fluid can also be used to heat the power generation working fluid in the power generation module 101 through heat exchange, so as to promote the seawater temperature difference power generation process of the power generation module 101.

[0071] To more clearly illustrate the beneficial technology of this application, the energy island system of this application is applied to the system shown in Figure 2 as an example to illustrate some specific implementations of this application. Figures 3 and 4 are schematic diagrams of the heat exchange unit structure in two different drawing directions. It should be understood that the naming of the heat exchange unit structure in Figures 3 and 4 is only an exemplary way to improve readability and does not constitute a limitation on the technical solution of this application. Optionally, each heat exchange unit described in this application may include a heat exchanger.

[0072] In one embodiment, as shown in FIG2, the heat exchange module includes a first heat exchange unit 25, a second heat exchange unit 40, a third heat exchange unit 53, a fourth heat exchange unit 56, a fifth heat exchange unit 6, and a circulating air source 17; wherein,

[0073] One end of the first heat exchange pipe of the first heat exchange unit 25 is connected to the other end of the second heat exchange pipe of the second heat exchange unit 40, the other end of the first heat exchange pipe of the third heat exchange unit 53, and the other end of the second heat exchange pipe of the fourth heat exchange unit 56 respectively; the other end of the first heat exchange pipe of the first heat exchange unit 25 is connected to the circulating gas source 17; an air filling regulating valve 14 is also provided on the connecting pipe between the other end of the first heat exchange pipe of the first heat exchange unit and the circulating gas source; the circulating gas source 17 stores the heat exchange circulating working fluid.

[0074] The other end of the second heat exchange pipeline of the second heat exchange unit 40 is connected to the other end of the first heat exchange pipeline of the third heat exchange unit 53 and the other end of the second heat exchange pipeline of the fourth heat exchange unit 56 respectively via pipelines.

[0075] One end of the first heat exchange pipe of the third heat exchange unit 53 is connected to the other end of the first heat exchange pipe of the fourth heat exchange unit 56 and the other end of the second heat exchange pipe of the fourth heat exchange unit 56 via pipes; the other end of the first heat exchange pipe of the third heat exchange unit 53 is connected to the other end of the first heat exchange pipe of the fourth heat exchange unit 56 and the other end of the second heat exchange pipe of the fourth heat exchange unit 56 via pipes; a second regulating valve 52 is provided at one end of the second heat exchange pipe of the third heat exchange unit 53.

[0076] One end of the first heat exchange pipe of the fourth heat exchange unit 56 is connected to the other end of the first heat exchange pipe of the fifth heat exchange unit 6 through a pipe.

[0077] A first regulating valve 39 is also provided on the connecting pipe at the other end of the first heat exchange pipe of the second heat exchange unit 40.

[0078] The first heat exchange pipeline and the second heat exchange pipeline in the heat exchange unit are connected for heat exchange, so as to carry out heat exchange between the heat exchange working fluids in the two pipelines.

[0079] Specifically, the heat exchange circulating working fluid in the heat exchange module can exchange heat with the cold storage working fluid in the storage / release module through the first heat exchange unit 25, exchange heat with the power generation circulating working fluid in the power generation module through the second heat exchange unit 40 and the third heat exchange unit 53, exchange heat with the heat exchange circulating working fluid in another pipeline of the heat exchange module through the fourth heat exchange unit 56, and exchange heat with the heat storage working fluid in the storage / release module through the fifth heat exchange unit 6.

[0080] Furthermore, the other end of the circulating air source also includes an air filling valve 18, which is used to fill the circulating air source with air from the outside when the circulating air source is short of air.

[0081] In one embodiment, referring to Figure 2, the cold storage / release module includes a medium-temperature cold storage unit 28 and a low-temperature cold storage unit 20, and the heat storage / release module includes a medium-temperature heat storage unit 8 and a high-temperature heat storage unit 2; wherein,

[0082] One end of the second heat exchange pipeline of the first heat exchange unit 25 is connected to the first end of the medium-temperature cold storage unit 28 through a pipeline, and the other end of the second heat exchange pipeline of the first heat exchange unit 25 is connected to one end of the low-temperature cold storage unit 20 and the second end of the medium-temperature cold storage unit 28 through pipelines respectively.

[0083] One end of the first heat exchange pipeline of the fifth heat exchange unit 6 is connected to the first end of the medium-temperature heat storage unit 8 and the other end of the high-temperature heat storage unit 2 through a pipeline; the other end of the first heat exchange pipeline of the fifth heat exchange unit 6 is connected to the second end of the medium-temperature heat storage unit 8 through a pipeline.

[0084] In this design, the heat exchange medium in the first heat exchange pipe of the first heat exchange unit 25 is a heat exchange circulation medium, and the heat exchange medium in the second heat exchange pipe of the first heat exchange unit 25 is a cold storage medium. The intermediate-temperature cold storage unit 28 can be used to store the cold storage medium to be cooled, and the low-temperature cold storage unit 20 can be used to store the cold storage medium that has already undergone heat exchange and cooling. Optionally, the cold storage medium can be hexane, but this application does not limit its use.

[0085] The heat exchange medium in the first heat exchange pipe of the fifth heat exchange unit 6 is a heat storage medium, and the heat exchange medium in the second heat exchange pipe of the fifth heat exchange unit 6 is a heat exchange circulation medium. The medium-temperature heat storage unit 8 can be used to store the heat storage medium to be heated, and the high-temperature cold storage unit can be used to store the heat storage medium that has been heated by heat exchange. Optionally, the heat storage medium can be molten salt, which is not limited in this application.

[0086] Specifically, the heat exchange circulating working fluid in the heat exchange module and the cold storage working fluid in the cold storage / release module exchange heat through the first heat exchange unit 25; the heat exchange circulating working fluid in the heat exchange module and the heat storage working fluid in the heat storage / release module exchange heat through the fifth heat exchange unit 6.

[0087] In one embodiment, referring to FIG2, the cold storage / release module further includes a cold energy heat exchange unit 19; the heat storage / release module further includes a heat energy heat exchange unit 1;

[0088] One end of the first heat exchange pipe of the cold energy heat exchange unit 19 is connected to the other end of the low temperature energy storage unit; the other end of the first heat exchange pipe of the cold energy heat exchange unit 19 is connected to the third end of the medium temperature energy storage unit.

[0089] One end of the second heat exchange pipeline of heat energy heat exchange unit 1 is connected to the third end of the medium temperature energy storage unit; the other end of the second heat exchange pipeline of heat energy heat exchange unit 1 is connected to one end of the high temperature energy storage unit.

[0090] In this unit, the heat exchange medium in the first heat exchange pipe of the cold energy heat exchange unit 19 is a cold storage medium, and the heat exchange medium in the second heat exchange pipe of the cold energy heat exchange unit 19 is an external heat exchange medium. The cold energy heat exchange unit 19 can be used to output the cold energy stored in the cold storage / release module to the outside.

[0091] The heat exchange medium in the first heat exchange pipe of the heat exchange unit 1 is an external heat exchange medium, and the heat exchange medium in the second heat exchange pipe of the heat exchange unit 1 is a heat storage medium. The heat exchange unit 1 can be used to output the heat energy stored in the heat storage / release module to the outside.

[0092] In one embodiment, referring to FIG2, the compression-expansion module further includes a first compression unit 60, a second compression unit 9, a first expansion unit 90, a second expansion unit 11, a drive unit 61, and a power generation unit; wherein,

[0093] One end of the first compression unit 60 is connected to one end of the second heat exchange pipeline of the fifth heat exchange unit 6 via a pipeline; the other end of the first compression unit 60 is connected to one end of the second heat exchange pipeline of the fourth heat exchange unit 56.

[0094] One end of the first expansion unit 90 is connected to the other end of the first heat exchange pipeline of the third heat exchange unit 53 and the other end of the first heat exchange pipeline of the fourth heat exchange unit 56 via a pipeline; the other end of the first expansion unit 90 is connected to the other end of the first heat exchange pipeline of the first heat exchange unit 25 via a pipeline; a first one-way valve 82 is provided on the pipeline connected to the other end of the first expansion unit 90 so that the heat exchange circulating working fluid flows out from the other end of the first expansion unit 90.

[0095] One end of the second compression unit 9 is connected to the other end of the first heat exchange pipeline of the third heat exchange unit 53 and the other end of the first heat exchange pipeline of the fourth heat exchange unit 56 via a pipeline; the other end of the second compression unit 9 is connected to the other end of the first heat exchange pipeline of the first heat exchange unit 25 via a pipeline.

[0096] One end of the second expansion unit 11 is connected to one end of the second heat exchange pipeline of the fifth heat exchange unit 6 through a pipeline; the other end of the second expansion unit 11 is connected to one end of the second heat exchange pipeline of the fourth heat exchange unit 56 through a pipeline; a second one-way valve 83 is provided on the pipeline connected to the other end of the second expansion unit 11 so that the heat exchange circulating working fluid flows out from the other end of the second expansion unit 11.

[0097] The drive unit 61 is electrically connected to the power output terminal of the power generation module, and the power output terminal of the drive unit 61 is connected to the first compression unit 60. The drive unit 61 is used to drive the first compression unit 60 to compress the heat exchange cycle working fluid by utilizing the excess power generated by the power generation module.

[0098] The first compression unit 60 is connected to the first expansion unit 90 via a coupling, and the second expansion unit 11 is connected to the second compression unit 90 via a coupling; the power generation unit 12 is connected to the second expansion unit 11 so as to generate electricity by utilizing the second expansion unit 11.

[0099] For example, the first compression unit 60 and the second compression unit 9 may include compressors, the first expansion unit 90 and the second expansion unit 11 may include expanders, the drive unit 61 may include a motor, and the power generation unit may include a generator. It is understood that the first compression unit 60 and the first expansion unit 90, connected by a coupling, have the same shaft rotation speed; the second compression unit 9 and the second expansion unit 11, connected by a coupling, have the same shaft rotation speed.

[0100] Specifically, the first compression unit 60 and the second compression unit 9 can be used to compress and heat the heat exchange circulating medium, while the heat exchange circulating medium can perform work and cool down in the first expansion unit 90 and the second expansion unit 11.

[0101] In one embodiment, referring to Figure 2, the power generation module includes a condensation heat exchange unit 41, an evaporation heat exchange unit 44, a cold water pump 35, a warm water pump 49, a circulating working fluid pump 45, a turbine 30, a first power generation circulation branch, a second power generation circulation branch, and a generator 29; wherein,

[0102] The cold water pump 35 is connected to the other end of the second heat exchange pipeline of the condensing heat exchange unit 41 through a pipeline; the warm water pump 49 is connected to one end of the first heat exchange pipeline of the evaporating heat exchange unit 44 through a pipeline.

[0103] One end of the first heat exchange pipe of the condensing heat exchange unit 41 is connected to one end of the second heat exchange pipe of the evaporating heat exchange unit 44 via a pipe and a first power generation circulation branch; the other end of the second heat exchange pipe of the evaporating heat exchange unit 44 is connected to one end of the turbine 30 via a pipe, and the other end of the turbine 30 is connected to the other end of the first heat exchange pipe of the condensing heat exchange unit 41 via the second power generation circulation branch; the first power generation circulation branch is equipped with a circulating working fluid pump 45; the shaft of the turbine 30 is connected to the generator 29;

[0104] One end of the first heat exchange pipe of the condensing heat exchange unit 41 is connected to one end of the first heat exchange pipe of the second heat exchange unit 40; the other end of the first heat exchange pipe of the condensing heat exchange unit 41 is connected to the other end of the first heat exchange pipe of the second heat exchange unit 40.

[0105] One end of the second heat exchange pipe of the evaporation heat exchange unit 44 is connected to one end of the second heat exchange pipe of the third heat exchange unit 53; the other end of the second heat exchange pipe of the evaporation heat exchange unit 44 is connected to the other end of the second heat exchange pipe of the third heat exchange unit 53.

[0106] It is important to understand that the working medium in the first heat exchange pipe of the condensation heat exchange unit 41 is the power generation cycle working medium, and the working medium in the second heat exchange pipe of the condensation heat exchange unit 41 is cryogenic seawater used for condensation. The working medium in the first heat exchange pipe of the evaporation heat exchange unit 44 is shallow seawater used for heating, and the working medium in the second heat exchange pipe of the evaporation heat exchange unit 44 is the power generation cycle working medium. The cold water pump 35 is connected to external seawater and can be used to pump cryogenic seawater into the condensation heat exchange unit 41; the warm water pump 49 is connected to external seawater and can be used to pump shallow seawater with a temperature higher than that of the cryogenic seawater into the evaporation heat exchange unit 44.

[0107] Specifically, when the power generation module generates electricity, the process of generating electricity using seawater temperature difference may include the following steps: A cold water pump 35 draws deep cold seawater (temperature approximately 4-7°C), which enters a condensation heat exchange unit 41 and exchanges heat with the power generation circulating working fluid. The working fluid in the condensation heat exchange unit 41 condenses from a gaseous state to a liquid state. The working fluid is then pressurized by a circulating working fluid pump 45 and enters an evaporation heat exchange unit 44. A warm water pump 49 draws shallow seawater (temperature approximately 25-30°C), which exchanges heat with the power generation circulating working fluid in the evaporation heat exchange unit 44, causing the working fluid to evaporate into a gaseous state. The working fluid then enters a turbine 30 to perform work, thereby driving the generator 29 to generate electricity. It is understood that the power generation circulating working fluid may include heat exchange fluids such as propane and ammonia; this application does not limit its use.

[0108] Furthermore, in one embodiment, taking hexane as the cold storage medium, molten salt as the heat storage medium, and circulating air source 17 as a circulating air replenishment tank as an example, as shown in Figure 5, sensors (instruments) for measuring the physical parameters of each heat exchange medium can also be installed on the connecting pipelines of the energy island system. It should be understood that in Figure 5, the instrument marked "T" is a temperature sensor, which can be used to measure the temperature of the heat exchange medium at the sensor's location; the instrument marked "P" is a pressure sensor, which can be used to measure the pressure of the heat exchange medium at the sensor's location; and the instrument marked "F" is a flow sensor, which can be used to measure the flow rate of the heat exchange medium at the sensor's location. It should be understood that, for the sake of visual appeal and ease of understanding by those skilled in the art, the sensors set in Figure 5 are not labeled. It is understood that the sensor locations in Figure 5 can also include other configurations, and if other sensor locations measure related physical quantities of the same system module or system unit, they should also fall within the scope of protection of this application.

[0109] In one embodiment, as shown in FIG6, this application also provides an energy island control method, which is applied to the energy island system described in any of the above embodiments; the method includes:

[0110] If it is during off-peak electricity hours, follow these steps:

[0111] Step S601: Disconnect the pipeline connections between the heat exchange module and the power generation module, between the heat exchange module and the storage / cooling module, and between the heat exchange module and the storage / heating module;

[0112] Step S603: Use the excess power generated by the power generation module to drive the compression and expansion module to perform compression and expansion operations on the heat exchange circulation medium.

[0113] Step S605: If the heat exchange circulation working fluid meets the preset temperature conditions, then the pipeline connection between the heat exchange module and the power generation module, and / or the heat exchange module and the storage / release module, and / or the heat exchange module and the storage / release module is restored to store the excess power generation in the form of heat energy and / or cold energy.

[0114] For example, taking the application of the above-mentioned energy island control method to the energy island system shown in Figure 2 as an example, the pipeline of the energy island system shown in Figure 2 also includes corresponding valves. It is understood that each valve in Figure 2 is only an exemplary setting method. The valve position setting of this application is not limited to the valve setting method of the energy island system shown in Figure 2. Other forms of valve position setting methods can also be used, as long as the valve position setting can realize the steps of the energy island control method described in this application.

[0115] Specifically, in one embodiment, taking the storage of excess electrical energy generated by the power generation module into the cold storage / heat storage module and the heat storage / heat release module during off-peak electricity consumption periods as an example, an exemplary operation process is as follows:

[0116] ① Close valves 65, 10, 67, 58, 54, 76, 77, 78, 75, 55, 27, 13, 3, and 7 to cut off the pipeline connections between the heat exchange module and the power generation module, between the heat exchange module and the storage / cooling module, between the heat exchange module and the storage / cooling module, between the heat exchange module and the second compression unit of the compression / expansion module, and between the heat exchange module and the second expansion unit of the compression / expansion module;

[0117] ② Open the remaining valves of the system shown in Figure 2, and the air (heat exchange working fluid) stored in the circulating air source 17 enters the heat exchange module and the compression cycle module. Meanwhile, the excess power generated by the generator 29 drives the motor 61 to rotate, and the heat exchange module and the compression cycle module start working.

[0118] Specifically, air sequentially passes through the first heat exchange unit 25, the fourth heat exchange unit 56, the first compression unit 60, the fifth heat exchange unit 6, the fifth heat exchange unit 56, the first expansion unit 90, and the first heat exchange unit 25, forming a heat exchange cycle with a circulating working fluid. During the cycle, the flow rate of the circulating air input from the other end of the first heat exchange pipeline of the first heat exchange unit is monitored by a flow sensor, and the opening of the air regulating valve 14 is adjusted to stabilize the air flow rate at the design value.

[0119] The flow rate of the air output from the circulating air source is monitored by a flow sensor. The circulating air source 17 is also equipped with a pressure sensor. When the pressure reading of the pressure sensor drops to 0.1MPa, valve 16 is closed and the circulating air source 17 stops charging.

[0120] ③ During the air circulation process, the temperature of the circulating air input at the other end of the first heat exchange pipeline of the first heat exchange unit 25 is monitored by the temperature sensor. When the first temperature drops to 4°C, valve 27 is opened and the cold storage medium in the medium temperature cold storage unit is input into one end of the second heat exchange pipeline of the first heat exchange unit 25 so as to absorb the cold energy (cold energy) in the circulating air through the cold storage medium.

[0121] The cold storage medium first circulates between the first heat exchange unit 25 and the medium-temperature cold storage unit 28. When the temperature sensor detects that the temperature of the cold storage medium output from the other end of the second heat exchange pipeline of the first heat exchange unit 25 has dropped to -70℃, valve 26 is closed and valve 13 is opened, so that the cold storage medium is cooled down and then stored in the low-temperature cold storage unit 20.

[0122] ④ When the temperature sensor detects that the temperature of the circulating air output from one end of the first heat exchange pipeline of the first heat exchanger is lower than 8°C, valve 73 is closed and valves 77, 78, and 39 are opened. The circulating air enters the second heat exchange unit 40 for heat exchange to cool the power generation circulating working fluid of the power generation module.

[0123] A flow sensor is used to monitor the flow rate at the other end of the first heat exchange pipeline entering the second heat exchange unit 40, and the opening of the first regulating valve 39 is controlled accordingly. A flow sensor is also used to monitor the flow rate of the cryogenic seawater entering the other end of the second heat exchange pipeline entering the condensation heat exchange unit 41, and the flow rate is adjusted by controlling the frequency of the chilled water pump 35.

[0124] Specifically, during off-peak electricity consumption periods, the control methods for the power generation module and the heat exchange module also include:

[0125] Calculate the enthalpy H1 of the power generation cycle fluid flowing out from the other end of turbine 30 based on its temperature and pressure.

[0126] Based on the temperature and pressure of the power generation cycle working fluid flowing out from one end of the first heat exchange pipe of the second heat exchange unit, the enthalpy H2 of the power generation cycle working fluid flowing out from one end of the first heat exchange pipe of the condensation heat exchange unit 41 and one end of the first heat exchange pipe of the second heat exchange unit 40 is calculated.

[0127] According to the following formula, the operating frequency of the variable frequency chilled water pump 35 is adjusted to control the input flow rate of the deep cold seawater into the condensing heat exchange unit, and the opening degree of the first regulating valve 39 is controlled to adjust the input flow rate of the power generation circulation medium flowing into the other end of the first heat exchange pipeline of the second heat exchange unit 40, thereby controlling the temperature T of the heat exchange circulation working medium flowing out of one end of the second heat exchange pipeline of the second heat exchange unit. 72 The second enthalpy value H2 is maintained at the set value:

[0128] (T 74 -T 72 )F 23 C Pair =F 38 (H1-H2)

[0129] (T 79 -T 78 )F 36 C Pwater =(F 32 -F 38 (H1-H2)

[0130] Among them, T 72 T represents the temperature of the heat exchange circulating fluid flowing out from one end of the second heat exchange pipe in the second heat exchange unit. 74F represents the temperature of the heat exchange circulating medium flowing into the second heat exchange pipe from the other end of the second heat exchange unit. 23 C is the temperature of the heat exchange circulating medium flowing into the other end of the first heat exchange pipe of the first heat exchange unit. Pair F is the specific heat capacity of the working fluid in the heat exchange cycle. 38 T represents the flow rate of the power generation circulating working fluid flowing into the second heat exchange unit from the other end of the first heat exchange pipe. 79 T represents the temperature of the cryogenic seawater flowing out from one end of the second heat exchange pipe of the condensation heat exchange unit. 78 F represents the temperature of the deep cold seawater flowing in from the other end of the second heat exchange pipe of the condensation heat exchange unit. 36 C represents the flow rate of cryogenic seawater flowing into the other end of the second heat exchange pipe of the condensation heat exchange unit. Pwater F is the specific heat capacity of deep, cold seawater. 32 H1 represents the flow rate of the working fluid in the second power generation cycle branch, H2 represents the first enthalpy value, and H1 represents the second enthalpy value.

[0131] ⑤ When the temperature of the heat exchange circulating medium flowing into one end of the second heat exchange pipeline of the fifth heat exchange unit 6 is higher than 280°C, valves 7 and 5 are opened so that the heat storage medium in the medium-temperature heat storage unit enters the fifth heat exchange unit 6 to exchange heat with the circulating air and circulates between the medium-temperature heat storage unit 8 and the fifth heat exchange unit 6; when the temperature of the heat storage medium at one end of the first heat exchange pipeline of the fifth heat exchange unit 6 is higher than 560°C, valve 5 is closed and valve 3 is opened so that the heat storage medium flows from the medium-temperature heat storage unit 8 through the fifth heat exchange unit 6 into the high-temperature heat storage unit 2.

[0132] ⑥ When the temperature of the heat exchange circulating medium flowing out from the other end of the first heat exchange pipeline of the fourth heat exchange unit is higher than 21°C, valve 69 is closed and valves 55, 75, and 52 are opened, and circulating air enters the third heat exchange unit 53 for heat exchange to heat the circulating working fluid of the power generation system; control the opening degree of the second regulating valve 52 and the operating frequency of the variable frequency hot water pump 49 to maintain the enthalpy value of the power generation circulating working fluid input at one end of the turbine 30 and the air temperature T71 to the set value.

[0133] Specifically, during off-peak electricity consumption periods, the control methods for the power generation module and the heat exchange module also include:

[0134] Based on the temperature and pressure of the power generation cycle working fluid input at one end of turbine 30, calculate the third enthalpy value H3 of the power generation cycle working fluid input at one end of turbine 30.

[0135] Based on the temperature and pressure of the power generation circulating working fluid flowing out from one end of the circulating working fluid pump 45, calculate the fourth enthalpy value H4 of the power generation circulating working fluid that flows into the third heat exchange unit 53 and the evaporation heat exchange unit 44.

[0136] According to the following formula, the operating frequency of the warm water pump 49 is adjusted to control the input flow rate of shallow seawater into the evaporation heat exchange unit, and the opening degree of the second regulating valve 52 is controlled to adjust the input flow rate of the power generation circulation medium flowing into one end of the second heat exchange pipeline of the third heat exchange unit 53, thereby controlling the temperature T of the heat exchange circulation medium at the other end of the first heat exchange pipeline of the third heat exchange unit. 71 The third enthalpy value H3 is maintained at the set value:

[0137] (T 68 -T 71 )F 23 C Pair =F 51 (H3-H4)

[0138] (T 80 -T 81 )F 50 C Pwater =(F 31 -F 51 (H3-H4)

[0139] Among them, T 68 T represents the temperature of the heat exchange circulating medium at one end of the first heat exchange pipe in the third heat exchange unit. 71 F represents the temperature of the heat exchange circulating medium at the other end of the first heat exchange pipe in the third heat exchange unit. 23 F represents the flow rate of the heat exchange circulating medium at the other end of the first heat exchange pipeline of the first heat exchange unit. 51 T is the flow rate of the power generation circulating medium at one end of the second heat exchange pipeline of the third heat exchange unit. 80 T represents the temperature of the shallow seawater input at one end of the first heat exchange pipe of the evaporative heat exchange unit. 81 F represents the temperature of the shallow seawater flowing out from the other end of the first heat exchange pipe of the evaporative heat exchange unit. 50 The flow rate of shallow seawater input at one end of the first heat exchange pipe of the evaporative heat exchange unit, F 31 F represents the flow rate of the power generation cycle working fluid flowing into one end of turbine 30. 51 C represents the flow rate of the power generation circulating working fluid at one end of the second heat exchange pipeline of the third heat exchange unit. Pair C is the specific heat capacity of the circulating air (heat exchange working fluid). Pwater This represents the specific heat capacity of shallow seawater.

[0140] For example, in one embodiment, during off-peak electricity hours, motor 61 drives the first compression unit 60 and the first expansion unit 77 to rotate. Circulating air (heat exchange circulating medium) enters the first compression unit 60 and is heated and pressurized (temperature reaches 570°C). Then, the circulating air is input to the fifth heat exchange unit 6, transferring heat to the heat storage medium, and then to the fourth heat exchange unit 56 for heat exchange to further reduce the temperature. The circulating air then enters the third heat exchange unit 53, transferring heat to the power generation circulating medium. It then enters the first expansion unit 77 to perform work, further reducing the temperature (temperature drops to -70°C) and pressure. The circulating air then enters the first heat exchange unit 25, transferring cold energy to the cold storage medium, and then enters the second heat exchange unit 40 to cool the power generation circulating medium. The circulating air then enters the fourth heat exchange unit 56 for heat exchange to increase the temperature. Finally, it enters the first compression unit 60, completing one cycle. It is understandable that the power generation module, compression and expansion module, heat exchange module, cold storage / heat release module, and heat storage / heat release module are interconnected through electrothermal coupling, which enables the cascade utilization of energy of different grades, thereby saving electricity for water pumps and converting excess power generation into heat energy stored in the heat storage / heat release module, or into cold energy stored in the cold storage / heat release module.

[0141] Furthermore, in one embodiment, the energy island control method further includes:

[0142] When the system stops storing energy, the following steps are performed:

[0143] Shut off valve 22 and open valves 14 and 16 to return air to the circulating air source;

[0144] When the pressure in the circulating air source is detected to reach the preset pressure value, valve 16 is shut off to stop the air supply of the circulating air source; the preset pressure value may include 1 to 2 MPa.

[0145] The electrical connection between the drive unit (motor) 61 and the power generation module is closed, and the power generation module stops supplying power to the compression and expansion module.

[0146] Close valves 52, 77, 78, 39, 55, and 75 to disconnect the pipeline connection between the heat exchange module and the power generation module;

[0147] Close valves 3, 7, 27, and 13 to disconnect the pipeline connections between the heat exchange module and the cold storage / release module, and between the heat exchange module and the heat storage / release module.

[0148] Close valves 63, 64, 59, and 66 to disconnect the pipeline connection between the heat exchange module and the compression and expansion module.

[0149] In one embodiment, as shown in FIG7, the method further includes:

[0150] If it is during the preset peak electricity consumption period, then perform the following steps:

[0151] Step S701: Activate the cold storage / release module and the heat storage / release module to release the stored cold and heat energy;

[0152] Step S703: Based on the released cold and hot energy, the compression and expansion module is made to generate electricity.

[0153] Step S705: Connect the power generation generated by the compression expansion module and the thermoelectric power generation generated by the power generation module to the grid for output.

[0154] Furthermore, in one embodiment, the method further includes: heating the power generation circulating medium in the power generation module by utilizing heat exchange between the heat exchange circulating medium and the power generation circulating medium of the power generation module, so as to promote the seawater temperature difference power generation process of the power generation module.

[0155] Specifically, in one embodiment, taking the release of cold energy stored in the energy island system and heat energy stored in the energy storage / heat storage module to increase power generation during peak electricity consumption periods as an example, an exemplary system operation flow is as follows:

[0156] ① Close valves 63, 64, 59, 66, 55, 75, 77, 78, 39, 54, 76, and 52 to cut off the pipeline connections between the heat exchange module and the first compression unit of the compression expansion module, between the heat exchange module and the first expansion unit of the compression expansion module, and between the heat exchange module and the power generation module.

[0157] ② Open valves 67, 10, 65, and 58 to connect the pipelines between the heat exchange module and the second expansion unit of the compression expansion module, as well as between the heat exchange module and the second compression unit of the compression expansion module.

[0158] ③ Open valves 13, 27, 3, and 7 to connect the pipelines between the heat exchange module and the cold storage / release module, as well as between the heat exchange module and the heat storage / release module.

[0159] ④ Open valves 14 and 16, and the circulating air source begins to charge the heat exchange system and the compression and expansion system. Specifically, the flow sensor monitors the flow rate of the heat exchange working fluid output by the circulating air source, and controls the circulation flow rate through the charging regulating valve 14. For example, when the internal pressure of the circulating air source drops to 0.1 MPa, valves 16 and 14 are closed to stop charging.

[0160] ⑤ When the temperature of the heat exchange circulating medium at the other end of the second heat exchange pipeline of the fourth heat exchange unit reaches above 20°C, close valve 70 and open valves 54, 76, and 52 to couple the heat exchange module with the power generation module.

[0161] Then, by controlling the opening of the second regulating valve 52 and the operating frequency of the variable frequency hot water pump 49, the temperature of the heat exchange circulation medium at the other end of the first heat exchange pipeline of the third heat exchange unit and the enthalpy of the power generation circulation medium input at one end of the turbine 30 are kept constant.

[0162] Specifically, during peak electricity consumption periods, the control methods for the power generation module and the heat exchange module include:

[0163] Calculate the fifth enthalpy H5 of the power generation circulation medium input at one end of turbine 30 based on the pressure and temperature of the power generation circulation medium input at one end of turbine 30.

[0164] Based on the temperature and pressure of the power generation circulating working fluid flowing out from one end of the circulating working fluid pump 45, calculate the sixth enthalpy value H6 of the power generation circulating working fluid that flows into the third heat exchange unit 53 and the evaporation heat exchange unit 44.

[0165] According to the following formula, the flow rate of shallow seawater input to the evaporation heat exchange unit is adjusted by regulating the operating frequency of the variable frequency hot water pump 80, and the flow rate of the power generation circulating working medium flowing into one end of the second heat exchange pipeline of the third heat exchange unit is adjusted by controlling the opening degree of the second regulating valve 52, so as to control the temperature T of the heat exchange circulating medium at the other end of the first heat exchange pipeline of the third heat exchange unit. 85 And the fifth enthalpy value H5 remains at the set value:

[0166] (T 84 -T 85 )F 23 C Pair =F 51 (H5-H6)

[0167] (T 80 -T 81 )F 50 C Pwater =(F 31 -F 51 (H5-H6)

[0168] Among them, T 84 T represents the temperature of the heat exchange circulating medium at one end of the first heat exchange pipe in the third heat exchange unit. 85 F represents the temperature of the heat exchange circulating medium at the other end of the first heat exchange pipe of the third heat exchange unit. 23 F represents the flow rate of the heat exchange circulating medium at the other end of the first heat exchange pipeline of the first heat exchange unit. 51 The flow rate T of the power generation circulation medium at one end of the second heat exchange pipeline of the third heat exchange unit. 80 T represents the temperature of the shallow seawater flowing into one end of the first heat exchange pipe of the condensation heat exchange unit. 81 The temperature of the shallow seawater flowing out from the other end of the first heat exchange pipe of the condensation heat exchange unit, F50 F is the flow rate of shallow seawater flowing into one end of the first heat exchange pipe of the condensation heat exchange unit. 31 C represents the flow rate of the power generation circulating medium flowing into one end of turbine 30. Pair C is the specific heat capacity of the circulating air (heat exchange medium). Pwater H5 represents the specific heat capacity of shallow seawater, H6 represents the fifth enthalpy value, and H5 represents the sixth enthalpy value.

[0169] For example, in one embodiment, during peak electricity consumption periods, taking circulating air as the heat exchange working fluid, the circulating air is heated to 560°C by the heat storage medium after passing through the fifth heat exchange unit 6; then the circulating air enters the second expansion unit 11 to expand and do work to drive the power generation unit to generate electricity, and the temperature and pressure of the circulating air decrease; then the circulating air enters the fourth heat exchange unit 56 to cool down; then the circulating air enters the third heat exchange unit 53 to transfer heat to the power generation working fluid; the circulating air enters the first heat exchange unit 25 to exchange heat with the cold storage medium, and the temperature of the circulating air further decreases to -50°C; then the circulating air enters the first compression unit 9 to increase the temperature and pressure of the circulating air; then the circulating air enters the fourth heat exchange unit 56 to exchange heat, and the temperature of the circulating air further increases; then the circulating air enters the fifth heat exchange unit 6 to absorb heat from the heat storage medium, thereby completing one cycle. It is understandable that the power generation module, compression and expansion module, heat exchange module, cold storage / release module, and heat storage / release module are electrothermally coupled to release the cold and heat energy stored in the cold and heat storage / release modules into electrical energy. This electrical energy is then connected to the grid with the electrical energy generated by the seawater temperature difference of the power generation module and sent out for power generation.

[0170] Furthermore, in one embodiment, the energy island control method further includes:

[0171] When the system stops releasing energy, perform the following steps:

[0172] Close valve 67 and open valves 14 and 16 to return the circulating air (heat exchange working fluid) to the circulating air replenishment tank (circulating air source).

[0173] When the internal pressure of the recirculating air replenishment tank reaches the preset pressure value, valve 16 is shut off to stop the recirculating air replenishment tank from being filled with air; the preset pressure value may include 1 to 2 MPa.

[0174] Disconnect the power generation unit 12 from the output circuit to stop power generation to the outside.

[0175] Close valves 54, 76, and 52 to disconnect the pipeline connection between the heat exchange module and the power generation module;

[0176] Close valves 3, 7, 27, and 13 to disconnect the piping between the heat exchange module and the cold storage / heat release module, as well as between the heat storage / heat release module.

[0177] Close valves 10, 65, and 58 to disconnect the piping between the heat exchange module and the second compression unit of the compression expansion module, as well as between the heat exchange module and the second expansion unit of the compression expansion module.

[0178] Furthermore, in one embodiment, when the external environment needs to utilize the cold energy or heat energy stored in the cold energy storage / release module or the heat energy storage / release module, it can be output in series with multiple heat exchange units of different levels through the second heat exchange pipeline of the cold energy heat exchange unit 19 or the first heat exchange pipeline of the heat energy heat exchange unit 1. Each heat exchange unit can control the temperature range of the output cold energy or heat energy by selecting different types of heat exchangers, so as to carry out multi-level heat exchange and cascade utilization of cold energy or heat energy.

[0179] Optionally, in one embodiment, the cold energy heat exchange unit of the cold storage / release module can also be connected to a phase change heat storage device.

[0180] Optionally, in one embodiment, the heat exchange unit of the heat storage / release module can also be connected to a phase change heat exchanger.

[0181] For example, it can be understood that the cold energy heat exchange unit of the cold storage / release module can achieve the delivery of cold energy of different grades through heat exchange with different refrigerants (such as water, ice slurry, organic solvents, cold storage materials, etc.); the heat energy heat exchange unit of the heat storage / release module can achieve the delivery of heat energy of different grades through heat exchange with different heat media (such as water, steam, heat storage materials, etc.).

[0182] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps involved in the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps.

[0183] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0184] In one embodiment, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any of the above embodiments.

[0185] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0186] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0187] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0188] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An energy island system, characterized in that, It includes a power generation module, a heat exchange module, a compression and expansion module, a cold storage / cooling module, and a heat storage / cooling module; The power generation module is used to generate electricity using the temperature difference between seawater and ocean water. The compression-expansion module is electrically connected to the power generation module and is connected to the heat exchange module through a pipeline, for compressing and / or expanding the heat exchange circulating working fluid; wherein, the heat exchange circulating working fluid is used to circulate in the pipeline of the compression-expansion module and the power generation module; The heat exchange module is connected to the power generation module, the cold storage / release module, and the heat storage / release module via pipelines; wherein, the cold storage / release module is used to store excess power generation in the form of cold energy during off-peak electricity consumption periods and release the cold energy during peak electricity consumption periods; the cold storage / release module is used to store excess power generation in the form of heat energy during off-peak electricity consumption periods and release the heat energy during peak electricity consumption periods.

2. The system according to claim 1, characterized in that, The heat exchange module includes a first heat exchange unit, a second heat exchange unit, a third heat exchange unit, a fourth heat exchange unit, a fifth heat exchange unit, and a circulating air source; wherein, One end of the first heat exchange pipe of the first heat exchange unit is connected to the other end of the second heat exchange pipe of the second heat exchange unit, the other end of the first heat exchange pipe of the third heat exchange unit, and the other end of the second heat exchange pipe of the fourth heat exchange unit via pipes respectively; the other end of the first heat exchange pipe of the first heat exchange unit is connected to the circulating gas source; an inflation regulating valve is also provided on the connecting pipe between the other end of the first heat exchange pipe of the first heat exchange unit and the circulating gas source; the circulating gas source stores the heat exchange circulating working fluid. The other end of the second heat exchange pipeline of the second heat exchange unit is connected to the other end of the first heat exchange pipeline of the third heat exchange unit and the other end of the second heat exchange pipeline of the fourth heat exchange unit through pipelines respectively. One end of the first heat exchange pipe of the third heat exchange unit is connected to the other end of the first heat exchange pipe of the fourth heat exchange unit and the other end of the second heat exchange pipe of the fourth heat exchange unit via pipes; the other end of the first heat exchange pipe of the third heat exchange unit is connected to the other end of the first heat exchange pipe of the fourth heat exchange unit and the other end of the second heat exchange pipe of the fourth heat exchange unit via pipes; a second regulating valve is provided at one end of the second heat exchange pipe of the third heat exchange unit. One end of the first heat exchange pipeline of the fourth heat exchange unit is connected to the other end of the first heat exchange pipeline of the fifth heat exchange unit via a pipeline. A first regulating valve is also provided on the connecting pipe at the other end of the first heat exchange pipe of the second heat exchange unit.

3. The system according to claim 2, characterized in that, The cold storage / release module includes a medium-temperature cold storage unit and a low-temperature cold storage unit, and the heat storage / release module includes a medium-temperature heat storage unit and a high-temperature heat storage unit; wherein... One end of the second heat exchange pipeline of the first heat exchange unit is connected to the first end of the medium-temperature cold storage unit through a pipeline, and the other end of the second heat exchange pipeline of the first heat exchange unit is connected to one end of the low-temperature cold storage unit and the second end of the medium-temperature cold storage unit through pipelines respectively. One end of the first heat exchange pipeline of the fifth heat exchange unit is connected to the first end of the medium-temperature thermal storage unit and the other end of the high-temperature thermal storage unit via a pipeline; the other end of the first heat exchange pipeline of the fifth heat exchange unit is connected to the second end of the medium-temperature thermal storage unit via a pipeline.

4. The system according to claim 3, characterized in that, The cold storage / release module further includes a cold energy heat exchange unit; the heat storage / release module further includes a heat energy heat exchange unit; One end of the first heat exchange pipeline of the cold energy heat exchange unit is connected to the other end of the low temperature energy storage unit; the other end of the first heat exchange pipeline of the cold energy heat exchange unit is connected to the third end of the medium temperature energy storage unit. One end of the second heat exchange pipeline of the heat exchange unit is connected to the third end of the medium-temperature energy storage unit; the other end of the second heat exchange pipeline of the heat exchange unit is connected to one end of the high-temperature energy storage unit.

5. The system according to claim 4, characterized in that, The compression and expansion module further includes a first compression unit, a second compression unit, a first expansion unit, a second expansion unit, a drive unit, and a power generation unit; wherein, One end of the first compression unit is connected to one end of the second heat exchange pipeline of the fifth heat exchange unit via a pipeline; the other end of the first compression unit is connected to one end of the second heat exchange pipeline of the fourth heat exchange unit. One end of the first expansion unit is connected to the other end of the first heat exchange pipeline of the third heat exchange unit and the other end of the first heat exchange pipeline of the fourth heat exchange unit through a pipeline; the other end of the first expansion unit is connected to the other end of the first heat exchange pipeline of the first heat exchange unit through a pipeline; a first one-way valve is provided on the pipeline connected to the other end of the first expansion unit so that the heat exchange circulating working fluid flows out from the other end of the first expansion unit. One end of the second compression unit is connected via a pipeline to the other end of the first heat exchange pipeline of the third heat exchange unit and the other end of the first heat exchange pipeline of the fourth heat exchange unit; the other end of the second compression unit is connected via a pipeline to the other end of the first heat exchange pipeline of the first heat exchange unit. One end of the second expansion unit is connected to one end of the second heat exchange pipeline of the fifth heat exchange unit via a pipeline; the other end of the second expansion unit is connected to one end of the second heat exchange pipeline of the fourth heat exchange unit via a pipeline; a second one-way valve is provided on the pipeline connected to the other end of the second expansion unit so that the heat exchange circulating working fluid flows out from the other end of the second expansion unit; The drive unit is electrically connected to the power output terminal of the power generation module, and the power output terminal of the drive unit is connected to the first compression unit. The drive unit is used to drive the first compression unit to compress the heat exchange working fluid by utilizing the excess power generated by the power generation module. The first compression unit is connected to the first expansion unit via a coupling, and the second expansion unit is connected to the second compression unit via a coupling; the power generation unit is connected to the second expansion unit to generate electricity by utilizing the second expansion unit.

6. The system according to claim 5, characterized in that, The power generation module includes a condensation heat exchange unit, an evaporation heat exchange unit, a cold water pump, a warm water pump, a circulating working fluid pump, a turbine, a first power generation circulation branch, a second power generation circulation branch, and a generator; wherein, The cold water pump is connected to the other end of the second heat exchange pipeline of the condensation heat exchange unit via a pipeline; the warm water pump is connected to one end of the first heat exchange pipeline of the evaporation heat exchange unit via a pipeline. One end of the first heat exchange pipe of the condensing heat exchange unit is connected to one end of the second heat exchange pipe of the evaporating heat exchange unit via a pipe through the first power generation circulation branch; the other end of the second heat exchange pipe of the evaporating heat exchange unit is connected to one end of the turbine via a pipe, and the other end of the turbine is connected to the other end of the first heat exchange pipe of the condensing heat exchange unit via the second power generation circulation branch; the first power generation circulation branch is equipped with the circulating working fluid pump; the turbine shaft is connected to the generator; One end of the first heat exchange pipe of the condensation heat exchange unit is connected to one end of the first heat exchange pipe of the second heat exchange unit; the other end of the first heat exchange pipe of the condensation heat exchange unit is connected to the other end of the first heat exchange pipe of the second heat exchange unit; one end of the second heat exchange pipe of the evaporation heat exchange unit is connected to one end of the second heat exchange pipe of the third heat exchange unit; the other end of the second heat exchange pipe of the evaporation heat exchange unit is connected to the other end of the second heat exchange pipe of the third heat exchange unit.

7. A method for controlling an energy island, characterized in that, Applied to the energy island system as described in any one of claims 1 to 6; the method comprises: If it is during off-peak electricity hours, follow these steps: Disconnect the pipeline connections between the heat exchange module and the power generation module, between the heat exchange module and the cold storage / release module, and between the heat exchange module and the heat storage / release module; The excess power generated by the power generation module drives the compression and expansion module to compress and expand the heat exchange circulation medium. If the heat exchange circulation medium meets the preset temperature conditions, the pipeline connection between the heat exchange module and the power generation module, and / or between the heat exchange module and the cold storage / release module, and / or between the heat exchange module and the cold storage / release module is restored to store the excess power generated in the form of heat energy and / or cold energy.

8. The method according to claim 7, characterized in that, The method further includes: If it is during the preset peak electricity consumption period, then perform the following steps: The cold energy storage / release module and the heat energy storage / release module are activated to release the stored cold energy and the heat energy; Based on the released cold energy and heat energy, the compression and expansion module performs work to generate electricity; The power generated by the compression and expansion module and the thermoelectric power generated by the power generation module are connected to the grid for output.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 7 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 7 to 8.

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