A comprehensive energy utilization system for offshore islands and its operation method

Abstract

The present invention relates to a comprehensive energy utilization system for offshore islands and its operation method. Wind turbines, solar photovoltaic modules, wave power generation platforms and tidal energy generators are all connected to seawater desalination devices and battery energy storage devices to provide electric energy for the seawater desalination devices and store excess electric energy in the battery energy storage devices. A water reservoir is connected to the seawater desalination device, and the water reservoir reserves fresh water. The battery energy storage device provides electricity for the island. A gas turbine is respectively connected to the seawater desalination device and the battery energy storage device, and it generates electricity as a supplementary power source. A gas turbine, a waste heat boiler and a lithium bromide unit are connected in sequence, and the lithium bromide unit provides cooling and heating for the island. A solar collector is connected to a heat storage tank. The water reservoir replenishes water for the heat storage tank and the waste heat boiler. This system makes full use of renewable energy sources such as wind power, photovoltaic power, wave energy and tidal energy that are abundant in offshore islands, and the clean electric energy generated can meet the electricity consumption of the island itself.

Description

Technical Field

[0001] The present invention relates to the field of distributed energy application technology, and in particular to a comprehensive energy utilization system for offshore islands and an operation method thereof, which provide comprehensive energy supply for offshore islands. Background Art

[0002] In recent years, with the rapid development of my country's economy and the continuous advancement of its marine strategy, the strategic fulcrum role of offshore islands in the development of resources such as oil, gas, and minerals, maritime transportation, and maritime defense has become increasingly prominent, becoming a strategic focus for my country to obtain new resources, expand its living space, and promote economic and social development. However, the offshore island environment is special, and materials and energy such as fresh water and electricity are in short supply. The increasingly serious problem of power shortage has become a bottleneck restricting the development of offshore islands. At present, the traditional offshore island power grid is mainly diesel-powered, with a small scale, independent and closed, and has not formed a complete set of equipment. It lacks external energy support, and has great drawbacks in design and construction, post-management and maintenance, and safety and stability. The development model is not sustainable. However, the offshore islands are rich in renewable energy resources such as wind, light, and wave energy in the sea area where they are located. There are densely populated uninhabited islands such as reefs and sandbanks around them, and the shallow water reef is wide. If the development of renewable energy on the islands can be coordinated and the energy security capability can be improved, it will provide a strong boost to the development of offshore islands.

[0003] For example, the patent with the authorization announcement number CN211958782U discloses an integrated energy system suitable for offshore wind farms and inhabited islands, which realizes the use of wind power nearby, reduces power loss, and reduces environmental pollution. However, the system is not perfect enough and has shortcomings such as intermittent and unstable renewable energy generation. Therefore, it is necessary to design a comprehensive energy utilization system for offshore islands. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a comprehensive energy utilization system for offshore islands and its operation method, which organically combines the abundant renewable energy sources such as wind power, photovoltaics, wave energy, tidal energy, etc. of offshore islands with fossil energy such as natural gas and diesel, to meet the needs of offshore islands for electricity, heat, water, heating, air conditioning and refrigeration, and ensure the stability and safety of energy use.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a comprehensive energy utilization system for offshore islands, characterized in that it includes a wind turbine, a solar photovoltaic module, a wave power generation platform, a tidal energy generator, a seawater desalination device, a reservoir, a battery energy storage device, a gas turbine, a waste heat boiler, a lithium bromide unit, a solar collector and a heat storage tank; the wind turbine, the solar photovoltaic module, the wave power generation platform and the tidal energy generator are all connected to the seawater desalination device and the battery energy storage device to provide electric energy for the seawater desalination device, and store excess electric energy in the battery energy storage device; The water reservoir is connected to the seawater desalination device, and the water reservoir is used to store fresh water prepared by the seawater desalination device to provide water for the island; the battery energy storage device provides electricity for the island; the gas turbine is connected to the seawater desalination device and the battery energy storage device respectively, and it generates electricity as a supplementary power source; the gas turbine, the waste heat boiler and the lithium bromide unit are connected in sequence, and the lithium bromide unit provides cooling and heating for the island; the solar collector is connected to the heat storage tank, and the heat storage tank provides heating for the island and provides a heat source for the lithium bromide unit; the water reservoir is connected to the heat storage tank and the waste heat boiler respectively, and replenishes water for the heat storage tank and the waste heat boiler.

[0006] Preferably, the gas turbine is equipped with a gas storage tank.

[0007] Preferably, the comprehensive energy utilization system is also equipped with a diesel generator as an emergency power source for generating electricity, and the diesel generator is equipped with an oil storage tank; the diesel generator is respectively connected to the seawater desalination device and the battery energy storage device.

[0008] The present invention also provides an operation method of an integrated energy utilization system for offshore islands: a wind turbine, a solar photovoltaic module, a wave power generation platform and a tidal power generator are combined to form a renewable energy power generation unit, and a battery energy storage device is used as a power storage unit; firstly, according to the characteristics of renewable energy in different seasons and different time periods, a wind turbine, a solar photovoltaic module, a wave power generation platform and a tidal power generator are combined to generate clean electricity for operating power of a seawater desalination device and providing daily electricity for the island; the fresh water generated by the seawater desalination device is stored in a reservoir to provide water replenishment for waste heat boilers and heat storage tanks and domestic water for the island; when wind energy, solar energy, wave energy and tidal energy are abundant, the excess electric energy generated is stored in the battery energy storage device, so that when the output of the renewable energy power source is insufficient, it is discharged to provide daily electricity for the island Electricity consumption; when the coupled operation of the renewable energy power generation unit and the power storage unit is not sufficient to provide stable power output, the gas turbine is started to drive the generator to operate as a supplementary power source to meet the island's electricity demand. The high-temperature flue gas generated by the operation of the gas turbine enters the waste heat boiler to provide a heat source for the lithium bromide unit, and the lithium bromide unit is used to provide island heating and air-conditioning refrigeration; when the lithium bromide unit is shut down, the waste heat boiler can also provide direct heating; the heat collected by the solar collector is stored in the heat storage tank, which provides heat for the island and the lithium bromide unit. When the lithium bromide unit is shut down, the heat storage tank can still directly provide heat for the island; when the renewable energy power generation unit, the power storage unit, or the gas turbine fails or an extreme situation occurs, the diesel generator is started as an emergency power source to ensure the loads of important users such as data centers and military facilities.

[0009] Compared with the prior art, the present invention has the following advantages and effects:

[0010] 1. This system makes full use of the offshore islands' abundant renewable energy sources such as wind power, photovoltaic power, wave energy, tidal energy, etc., and generates clean electricity to meet the islands' own electricity needs;

[0011] 2. Configure battery energy storage devices to store excess electricity when wind energy, solar energy, wave energy, and tidal energy are abundant, and discharge when the output of renewable energy power sources is insufficient, effectively smoothing out fluctuations in renewable energy output and load;

[0012] 3. Configure gas storage tanks for gas turbine power generation systems to supplement energy supply when the battery energy storage device is insufficient to meet the power load demand;

[0013] 4. Configure oil storage tanks for diesel generator power generation systems to ensure that important loads do not lose power in extreme situations on the island, and fully guarantee the safety and reliability of important loads such as island data centers and military facilities;

[0014] 5. Configure a waste heat utilization system to utilize the flue gas of gas turbines in a cascade manner. Lithium bromide can also be used to generate cooling and heating for daily use, making the island self-sufficient, energy-saving and environmentally friendly, and improving the comprehensive utilization efficiency of the system;

[0015] 6. The solar collector and heat storage tank are configured to not only utilize renewable energy and improve the environmental performance of the system, but also provide multiple guarantees for the heat source for the system and improve the safety of the system;

[0016] 7. Desalination equipment is deployed to effectively solve the problem of water shortage on offshore islands. The synergy with desalination is utilized to adjust fresh water through water-making units to balance the renewable energy system, suppress the uncertainty of renewable energy, and meet the water needs of heat storage tanks and waste heat boilers in the system and domestic water needs on the island at the same time, so as to achieve the effect of peak shaving and reduce the cost of fresh water production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0019] Explanation of the accompanying drawings: wind turbine 1, solar photovoltaic module 2, wave energy power generation platform 3, tidal energy generator 4, seawater desalination device 5, water reservoir 6, battery energy storage device 7, gas storage tank 8, gas turbine 9, waste heat boiler 10, lithium bromide unit 11, solar collector 12, heat storage tank 13, oil storage tank 14, diesel generator 15. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0021] Example

[0022] See also Figure 1 .

[0023] The present embodiment discloses a comprehensive energy utilization system for offshore islands, which includes a wind turbine 1, a solar photovoltaic module 2, a wave energy power generation platform 3, a tidal energy generator 4, a seawater desalination device 5, a reservoir 6, a battery energy storage device 7, a gas storage tank 8, a gas turbine 9, a waste heat boiler 10, a lithium bromide unit 11, a solar collector 12, a heat storage tank 13, an oil storage tank 14 and a diesel generator 15.

[0024] In this embodiment, the wind turbine 1, the solar photovoltaic module 2, the wave power generation platform 3 and the tidal power generator 4 are all connected to the seawater desalination device 5 and the battery energy storage device 7 to provide electric energy for the seawater desalination device 5 and store excess electric energy in the battery energy storage device 7. The water reservoir 6 is connected to the seawater desalination device 5 and is used to store fresh water prepared by the seawater desalination device 5 to provide water for the island. The battery energy storage device 7 provides electricity for the island.

[0025] In this embodiment, the gas turbine 9 is connected to the seawater desalination device 5 and the battery energy storage device 7 respectively, and it is used as a supplementary power source to generate electricity; the gas turbine 9, the waste heat boiler 10 and the lithium bromide unit 11 are connected in sequence, and the lithium bromide unit 11 provides cooling and heating for the island. The gas storage tank 8 provides fuel for the gas turbine 9, and the waste heat and exhaust gas generated during the power generation process of the gas turbine 9 enters the waste heat boiler 10, providing a heat source for the lithium bromide unit 11, providing heating, hot water and air conditioning for the offshore island, and utilizing energy in a cascade manner to improve the overall energy efficiency of the system.

[0026] In this embodiment, the solar collector 12 is connected to the heat storage tank 13, and the heat storage tank 13 provides heat for the island and a heat source for the lithium bromide unit 11; the water storage tank 6 is connected to the heat storage tank 13 and the waste heat boiler 10 respectively, and replenishes water for the heat storage tank 13 and the waste heat boiler 10. When the system is operating normally, the heat storage tank 13 is mainly used to ensure the heat source of the lithium bromide unit 11, and the lithium bromide unit provides heating and air conditioning for the island; when the lithium bromide unit 11 is shut down, the heat storage tank 13 can still directly provide heat for the island.

[0027] In this embodiment, the diesel generator 15 is used as an emergency power source to generate electricity. The diesel generator 15 is equipped with an oil storage tank 14. The diesel generator 15 is respectively connected to the seawater desalination device 5 and the battery energy storage device 7. When the renewable energy power source, energy storage device, and gas turbine power generation system on the island fail or an extreme situation occurs and cannot meet the demand, it is started as an emergency power source to ensure the load of important users such as data centers and military facilities.

[0028] In this embodiment, the operation method of the integrated energy utilization system for offshore islands is: the wind turbine 1, the solar photovoltaic module 2, the wave energy power generation platform 3 and the tidal energy generator 4 are combined to form a renewable energy power generation unit, and the battery energy storage device 7 is used as the power storage unit; first, according to the characteristics of renewable energy in different seasons and different time periods, the wind turbine 1, the solar photovoltaic module 2, the wave energy power generation platform 3 and the tidal energy generator 4 are combined to generate clean electricity for the operation of the seawater desalination device 5 and the daily electricity supply of the island; the fresh water generated by the seawater desalination device 5 is stored in the reservoir 6 as a reserve water source to provide water replenishment for the waste heat boiler 10 and the heat storage tank 13 and domestic water for the island, and the synergy with the seawater desalination is utilized to adjust the fresh water through the water making unit to balance the renewable energy system and suppress the uncertainty of renewable energy; when the wind energy, solar energy, wave energy and tidal energy are abundant, the excess electric energy generated is stored in the battery energy storage device 7, so that when the output of the renewable energy power source is insufficient, the battery energy storage device 7 is discharged to provide daily electricity for the island; when the renewable energy power generation unit and the power storage unit are coupled and operated When the power output is insufficient to provide a stable output, the gas turbine 9 is started to drive the generator to operate as a supplementary power source to meet the electricity demand of the island. The high-temperature flue gas generated by the operation of the gas turbine 9 enters the waste heat boiler 10 to provide a heat source for the lithium bromide unit 11. The lithium bromide unit 11 provides heating and air conditioning for the island, realizing energy cascade utilization and improving the overall energy efficiency of the system. When the lithium bromide unit 11 is shut down, the waste heat boiler 10 can also directly provide heat. The heat collected by the solar collector 12 is stored in the heat storage tank 13, which provides heating for the island and for the bromide unit. The lithium unit 11 provides a heat source. When the lithium bromide unit 11 is shut down, the heat storage tank 13 can still directly provide heat for the island. The solar collector 12 and the heat storage tank 13 not only utilize renewable energy to improve the environmental performance of the system, but also provide multiple guarantees for the heat source for the system energy supply, thereby improving the system safety. When the renewable energy power generation unit, the power storage unit, and the gas turbine 9 fail or extreme situations occur and they cannot meet the demand, the diesel generator 15 is started as an emergency power supply to ensure the loads of important users such as data centers and military facilities, thereby greatly improving the system safety.

[0029] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles of the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A comprehensive energy utilization system for offshore islands, characterized in that: The invention comprises a wind turbine (1), a solar photovoltaic module (2), a wave power generation platform (3), a tidal power generator (4), a seawater desalination device (5), a water reservoir (6), a battery energy storage device (7), a gas turbine (9), a waste heat boiler (10), a lithium bromide unit (11), a solar collector (12) and a heat storage tank (13); the wind turbine (1), the solar photovoltaic module (2), the wave power generation platform (3) and the tidal power generator (4) are all connected to the seawater desalination device (5) and the battery energy storage device (7) to provide electric energy for the seawater desalination device (5) and store excess electric energy in the battery energy storage device (7); the water reservoir (6) is connected to the seawater desalination device (5), and the water reservoir (6) is used to store fresh water prepared by the seawater desalination device (5) to provide water for the island; the battery energy storage device (7) provides electricity for the island; the gas turbine (9) ) are respectively connected to the seawater desalination device (5) and the battery energy storage device (7), which serve as a supplementary power source to generate electricity; the gas turbine (9), the waste heat boiler (10) and the lithium bromide unit (11) are connected in sequence, and the lithium bromide unit (11) provides cooling and heating for the island; the solar collector (12) is connected to the heat storage tank (13), and the heat storage tank (13) provides heating for the island and a heat source for the lithium bromide unit (11); the water reservoir (6) is respectively connected to the heat storage tank (13) and the waste heat boiler (10), and replenishes water for the heat storage tank (13) and the waste heat boiler (10); the gas turbine (9) is equipped with a gas storage tank (8); the comprehensive energy utilization system is also equipped with a diesel generator (15) as an emergency power source to generate electricity, and the diesel generator (15) is equipped with an oil storage tank (14); the diesel generator (15) is respectively connected to the seawater desalination device (5) and the battery energy storage device (7).

2. An operating method for the integrated energy utilization system for offshore islands as claimed in claim 1, characterized in that: A wind turbine (1), a solar photovoltaic module (2), a wave power generation platform (3) and a tidal power generator (4) are combined to form a renewable energy power generation unit, and a battery energy storage device (7) serves as a power storage unit. First, according to the characteristics of renewable energy in different seasons and different time periods, the wind turbine (1), the solar photovoltaic module (2), the wave power generation platform (3) and the tidal power generator (4) are combined to generate clean electric energy, which is used for operating the seawater desalination device (5) and providing daily electricity for the island. The fresh water generated by the seawater desalination device (5) is stored in a reservoir (6) to provide water replenishment for the waste heat boiler (10) and the heat storage tank (13) and domestic water for the island. When wind energy, solar energy, wave energy and tidal energy are abundant, the excess electric energy generated is stored in the battery energy storage device (7), so that when the output of the renewable energy power source is insufficient, the electric energy is discharged to provide daily electricity for the island. When the renewable energy power source is insufficient, the fresh water is discharged to provide daily electricity for the island. When the coupled operation of the unit and the power storage unit is insufficient to provide a stable power output, the gas turbine (9) is started to drive the generator to operate as a supplementary power source to meet the power demand of the island. The high-temperature flue gas generated by the operation of the gas turbine (9) enters the waste heat boiler (10) to provide a heat source for the lithium bromide unit (11), and the lithium bromide unit (11) is used to provide heating and air conditioning for the island. When the lithium bromide unit (11) is shut down, the waste heat boiler (10) can also directly provide heat. The heat collected by the solar collector (12) is stored in the heat storage tank (13). The heat storage tank (13) provides heating for the island and a heat source for the lithium bromide unit (11). When the lithium bromide unit (11) is shut down, the heat storage tank (13) can still directly provide heating for the island. When the renewable energy power generation unit, the power storage unit, or the gas turbine (9) fails or an extreme situation occurs, the diesel generator (15) is started as an emergency power source.

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