Off-grid ocean island island operation system

Abstract

The invention relates to the technical field of comprehensive energy, and discloses an off-grid pelagic island island operation system. A fresh water treatment unit takes desalted seawater as an in-island fresh water supply source and conveys the desalted seawater to an electrolytic cell; the electrolytic cell prepares hydrogen and oxygen; the on-island plantation and the on-island cultivation garden serve as on-island food supply sources, and generated biomass waste is converted into natural gas through a biological waste treatment device; the hydrogen-doped gas turbine generates electricity to supply electric load to the island, meanwhile, exhaust gas of the hydrogen-doped gas turbine supplies heat and cold to the island through the waste heat boiler and the lithium bromide unit via a heat supply network, and steam generated by the lithium bromide unit is recycled to the electrolytic bath through the fresh water treatment unit. The system makes full use of the landform advantage of the island with land and sea features, and configuration guarantee is performed from all directions of food, fresh water, electric power, heat energy and the like, so that the ocean island has complete island operation capacity under the condition of no support.

Description

Technical Field

[0001] The present invention relates to the field of integrated energy technology, and in particular to an off-grid remote ocean island operation system. Background Art

[0002] my country's key infrastructure sectors such as electricity and transportation are accelerating their transformation to deep low-carbon and clean development. More and more offshore islands are in urgent need of development, and maritime traffic is becoming increasingly busy. Offshore energy demand will become a deep decarbonization target after carbon peak. More importantly, offshore islands are also in urgent need of a safe and stable island operation system. Since isolated offshore islands and reefs do not have the support of large power grids, microgrids rely solely on renewable energy for power generation and do not have the ability to operate completely in isolation. When wind and light resource conditions are poor, or the power supply is damaged by enemy attacks, it is very easy to cause load power supply interruptions. Summary of the invention

[0003] In view of this, the present invention provides an off-grid remote ocean island isolated island operation system to solve the problem that the remote ocean island does not have the ability to operate completely in an isolated island.

[0004] The present invention provides an off-grid remote ocean island operation system, the system comprising: a freshwater treatment unit, an electrolyzer, a floating ocean thermal energy conversion power generation platform, an offshore wind power unit, a solar photovoltaic unit, an island plantation, an island aquaculture garden, a biological waste treatment device, a hydrogen-blended gas turbine, a waste heat boiler and a lithium bromide unit, wherein:

[0005] The desalinated water treatment unit is used to desalinate the seawater and use the desalinated seawater as a source of fresh water supply for the island, while transporting the desalinated seawater to the electrolytic cell;

[0006] The electrolyzer uses the electric energy provided by the floating ocean thermal energy conversion power generation platform, the offshore wind power unit, the solar photovoltaic unit, and the water transported by the fresh water treatment unit to produce hydrogen and oxygen;

[0007] The plantation on the island and the aquaculture garden on the island serve as a source of food supply on the island, and the biomass waste generated by the plantation on the island and the aquaculture garden on the island is converted into gas that can replace natural gas fuel through the biological waste treatment device;

[0008] The hydrogen-blended gas turbine utilizes the hydrogen transmitted by the electrolyzer and the gas transmitted by the biological waste treatment device to generate electricity to supply the island's electrical load. At the same time, the exhaust gas of the hydrogen-blended gas turbine passes through the waste heat boiler and the lithium bromide unit through the heat network to provide heating and cooling for the island. The water vapor generated by the lithium bromide unit is recovered to the electrolyzer through the fresh water treatment unit.

[0009] In an optional embodiment, the system further comprises: a hydrogen storage tank and an oxygen storage tank, wherein:

[0010] The hydrogen storage tank is used to store the hydrogen prepared by the electrolyzer;

[0011] The oxygen storage tank is used to store the oxygen produced by the electrolyzer;

[0012] When the amount of hydrogen produced by the electrolyzer fluctuates, the charging and discharging of the hydrogen storage tank is regulated to suppress the fluctuation of the amount of hydrogen.

[0013] In an optional embodiment, the system further comprises: a thermal energy storage device and an electric boiler, wherein:

[0014] When the heat supply of the hydrogen-blended gas turbine is greater than the heat load, starting the thermal energy storage device to store heat;

[0015] When the heating amount of the hydrogen-blended gas turbine is less than the heat load, the thermal energy storage device is started to release heat or the electric boiler is started to supplement the heat supply.

[0016] In an optional embodiment, the system further comprises: a carbon capture device and a methane reactor, wherein:

[0017] The carbon capture device is used to recover carbon dioxide from the exhaust gas of the hydrogen-doped gas turbine and transport the recovered carbon dioxide to the methane reactor;

[0018] The methane reactor converts the carbon dioxide into natural gas which is then supplied to the hydrogen-blended gas turbine again.

[0019] In an optional embodiment, the system further includes: a fuel cell, which converts the hydrogen in the hydrogen storage tank into electrical energy to supply the island electrical load when the thermal load is less than a preset value.

[0020] In an optional embodiment, the biological waste treatment device includes: a pyrolysis gasification device, a biogas tank, a purification device and a gas storage tank, wherein:

[0021] The pyrolysis gasification device is used to convert the dry waste in the biomass waste into synthesis gas that can replace natural gas fuel, and store the synthesis gas in the gas storage tank;

[0022] The biogas tank is used to ferment wet waste in the biomass waste to produce biogas;

[0023] The purification device is used for purifying biogas and storing the purified biogas in the gas storage tank.

[0024] In an optional embodiment, the system further comprises: a seaweed feeding area, and the seaweed in the seaweed feeding area is used to supplement the biogas fermentation raw materials.

[0025] In an optional embodiment, the fresh water treatment unit includes: a membrane desalination device, a thermal desalination device and a fresh water reservoir, wherein the membrane desalination device and the thermal desalination device are used to desalinate seawater and send the desalinated seawater into the fresh water reservoir.

[0026] In an optional embodiment, the system further comprises: a flood diversion ditch and a rainwater regulating pool, wherein the flood diversion ditch is used to collect rainwater and send the rainwater into the rainwater regulating pool.

[0027] In an optional embodiment, the system also includes: a soil source heat pump, a seawater source heat pump and a water quality treatment unit, wherein the soil source heat pump and the seawater source heat pump provide diverse heat energy supplies for the island, and the water generated by the soil source heat pump and the seawater source heat pump is sent to the fresh water reservoir through the water quality treatment unit.

[0028] In an optional embodiment, the system further includes: a land mobile energy storage vehicle and an offshore power storage vessel, wherein the land mobile energy storage vehicle and the offshore power storage vessel are used to supply electricity and energy to the island in extreme situations.

[0029] The present invention provides an off-grid remote ocean island isolated island operation system, in which a freshwater treatment unit is used to desalinate seawater, and the desalinated seawater is used as a source of freshwater supply on the island, and the desalinated seawater is transported to an electrolyzer; the electrolyzer uses the electric energy provided by a floating ocean thermal energy conversion power generation platform, an offshore wind power unit, and a solar photovoltaic unit, and the water transported by the freshwater treatment unit to prepare hydrogen and oxygen; the plantations and aquacultures on the island serve as a source of food supply on the island, and the biomass waste generated by the plantations and aquacultures on the island is converted into a gas that can replace natural gas fuel through a biological waste treatment device; a hydrogen-blended gas turbine uses the hydrogen transmitted by the electrolyzer and the gas transmitted by the biological waste treatment device to generate electricity to supply the island's electrical load, and at the same time, the exhaust gas of the hydrogen-blended gas turbine is used to provide heating and cooling for the island through a waste heat boiler and a lithium bromide unit via a heat network, and the water vapor generated by the lithium bromide unit is recovered to the electrolyzer through the freshwater treatment unit. The system fully utilizes the geographical advantages of islands as having both land and sea features, and provides all-round support in terms of food, fresh water, electricity, thermal energy, etc., so that the distant ocean islands have the ability to operate completely in isolation without any support. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of an off-grid ocean island operation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] The present invention provides an off-grid ocean island operation system, such as Figure 1 As shown, the system includes: a freshwater treatment unit, an electrolyzer, a floating ocean thermal energy conversion power generation platform, an offshore wind power unit, a solar photovoltaic unit, an island plantation, an island aquaculture garden, a biological waste treatment device, a hydrogen-blended gas turbine, a waste heat boiler and a lithium bromide unit.

[0034] Among them, the desalination unit is used to desalinate seawater and use the desalinated seawater as the source of fresh water supply on the island, and at the same time, the desalinated seawater is transported to the electrolyzer. The electrolyzer uses the electricity provided by the floating ocean thermal energy conversion power generation platform, the offshore wind power unit, the solar photovoltaic unit and the water transported by the desalination unit to produce hydrogen and oxygen. The plantations and aquacultures on the island serve as the source of food supply on the island. The biomass waste generated by the plantations and aquacultures on the island is converted into gas that can replace natural gas fuel through the biological waste treatment device. The hydrogen-blended gas turbine uses the hydrogen transmitted by the electrolyzer and the gas transmitted by the biological waste treatment device to generate electricity and supply the island's electrical load. At the same time, the exhaust gas of the hydrogen-blended gas turbine is used to heat and cool the island through the waste heat boiler and the lithium bromide unit through the heat network. The water vapor generated by the lithium bromide unit is recycled to the electrolyzer through the desalination unit.

[0035] Specifically, the off-grid ocean island operation system is equipped with a floating ocean thermal energy conversion power generation platform, which uses the temperature difference between surface seawater and deep seawater to generate electricity, complements with offshore wind power units and solar photovoltaic units, provides power load for the island, and jointly ensures the power safety of the island. The system is also equipped with a proton exchange membrane electrolyzer, which starts and stops quickly and has a wide range of power adjustment. The system is also equipped with plantations and breeding gardens on the island, and biomass waste treatment devices to provide self-sufficient food supply on the island. The generated biomass waste is separated into dry and wet, and the dry biomass waste is pyrolyzed and converted into clean fuel. The wet part is purified into natural gas after anaerobic fermentation, thereby meeting the gas demand. The system is also equipped with a hydrogen-doped gas turbine, which generates electricity in accordance with the "electricity determines heat" mode to supply the island's electrical load. The hydrogen transmitted by the electrolyzer and the gas transmitted by the biological waste treatment device provide fuel for the hydrogen-doped gas turbine, and the generated electricity provides a stable power supply for the island. The exhaust gas of the hydrogen-doped gas turbine is passed through the waste heat boiler and the lithium bromide unit through the heat network to provide heating and cooling for the island. The water vapor produced by the lithium bromide unit is recovered to the electrolyzer through the fresh water treatment unit.

[0036] The present invention provides an off-grid remote ocean island isolated island operation system, in which a freshwater treatment unit is used to desalinate seawater, and the desalinated seawater is used as a source of freshwater supply on the island, and the desalinated seawater is transported to an electrolyzer; the electrolyzer uses the electric energy provided by a floating ocean thermal energy conversion power generation platform, an offshore wind power unit, and a solar photovoltaic unit, and the water transported by the freshwater treatment unit to prepare hydrogen and oxygen; the plantations and aquacultures on the island serve as a source of food supply on the island, and the biomass waste generated by the plantations and aquacultures on the island is converted into a gas that can replace natural gas fuel through a biological waste treatment device; a hydrogen-blended gas turbine uses the hydrogen transmitted by the electrolyzer and the gas transmitted by the biological waste treatment device to generate electricity to supply the island's electrical load, and at the same time, the exhaust gas of the hydrogen-blended gas turbine is used to provide heating and cooling for the island through a waste heat boiler and a lithium bromide unit via a heat network, and the water vapor generated by the lithium bromide unit is recovered to the electrolyzer through the freshwater treatment unit. The system fully utilizes the geographical advantages of islands as having both land and sea features, and provides all-round support in terms of food, fresh water, electricity, thermal energy, etc., so that the distant ocean islands have the ability to operate completely in isolation without any support.

[0037] In an optional embodiment, if Figure 1 As shown, the system also includes: a hydrogen storage tank and an oxygen storage tank. The hydrogen storage tank is used to store hydrogen produced by the electrolyzer. The oxygen storage tank is used to store oxygen produced by the electrolyzer. When the amount of hydrogen produced by the electrolyzer fluctuates, the charging and discharging of the hydrogen storage tank is regulated to suppress the fluctuation of the hydrogen amount.

[0038] Specifically, the hydrogen produced by the electrolyzer is stored in a hydrogen storage tank. By selecting high-pressure gaseous hydrogen storage, hydrogen can be sold directly to the outside world to supply hydrogen loads such as ships. Oxygen is sent to the oxygen storage tank and sold to the outside world to generate revenue. Furthermore, offshore wind power and solar photovoltaics, renewable energy sources, have large fluctuations in their power generation capacity due to natural factors such as wind and light. The electrolyzer relies on the electricity generated by offshore wind power and solar photovoltaics to produce hydrogen. The change in its power generation is bound to affect the work of the electrolyzer, and its workload will be affected by the power supply. When the supply of offshore wind power and solar photovoltaic power is insufficient, the hydrogen production of the electrolyzer is reduced, and the hydrogen storage tank releases hydrogen to supplement the shortage of supply; when the supply of offshore wind power and solar photovoltaic power is sufficient, the excess hydrogen is stored and released when it is insufficient, so as to maintain a stable supply of hydrogen.

[0039] In an optional embodiment, if Figure 1 As shown, the system also includes: a heat storage device and an electric boiler. When the heat supply of the hydrogen-blended gas turbine is greater than the heat load, the heat storage device is started to store heat. When the heat supply of the hydrogen-blended gas turbine is less than the heat load, the heat storage device is started to release heat or the electric boiler is started to supplement the heat supply.

[0040] Specifically, thermal energy storage devices and electric boilers are configured to reasonably allocate electricity and heat according to the wind power abandonment and electricity consumption, and complement each other to jointly ensure the safety of offshore thermal load. For example, when the supply of wind power and solar energy is sufficient and the electricity load on the island is guaranteed, wind power abandonment and electricity abandonment are avoided, and heat is directly supplied through electric boilers; when the supply of wind power and solar energy is insufficient, the electricity load on the island is guaranteed by hydrogen-blended gas turbine power generation, and the heat generated by the system is supplied to heat users through cascade utilization, and the excess heat is stored in thermal energy storage and supplied to heat users on time and in quantity.

[0041] In the embodiment of the present invention, the thermal energy storage device utilizes the waste heat generated by the hydrogen-blended gas turbine in a cascade manner, improves energy utilization efficiency, and realizes offshore thermal load supply. The electric boiler is integrated into the heat network and the thermal energy storage complements each other, improving the thermal load safety factor.

[0042] In an optional embodiment, if Figure 1 As shown, the system also includes: a carbon capture device and a methane reactor. The carbon capture device is used to recover carbon dioxide from the exhaust gas of the hydrogen-blended gas turbine and transport the recovered carbon dioxide to the methane reactor. The methane reactor converts carbon dioxide into natural gas and supplies it to the hydrogen-blended gas turbine again.

[0043] Specifically, the system is equipped with a carbon capture device to recycle the generated carbon dioxide. The carbon dioxide generated during the production of the hydrogen-blended gas turbine unit is used as the raw material of the methane reactor, and the produced natural gas is again supplied to the hydrogen-blended gas turbine unit, thereby minimizing the system's carbon emissions.

[0044] In an optional embodiment, if Figure 1 As shown, the system also includes: a fuel cell. When the heat load is less than a preset value, the fuel cell converts the hydrogen in the hydrogen storage tank into electrical energy to supply the island electrical load.

[0045] Specifically, the fuel cell operates as an energy storage system, and the hydrogen energy is reasonably allocated with the hydrogen-blended gas turbine to maximize the benefits. For example, when the heat load demand is high, the hydrogen-blended gas turbine can realize the cascade utilization of electricity and heat energy; when the heat load demand is low, the use of fuel cells takes into account the diversified utilization of hydrogen energy, and the number of hydrogen energy-using devices increases, so that all excess electricity is converted into hydrogen energy for equipment use, which greatly reduces the amount of wind abandonment, greatly reduces the output of the hydrogen-blended gas turbine, and significantly reduces carbon emissions.

[0046] In the embodiment of the present invention, the system is equipped with a proton exchange membrane fuel cell to provide energy for offshore loads. The fuel cell participates in peak load regulation when the load fluctuates, and can be used as a supplementary power source to ensure the safety of offshore loads. The fuel cell and the hydrogen-blended gas turbine complement each other to jointly ensure the safety and stability of offshore loads and improve system safety.

[0047] In an optional embodiment, if Figure 1 As shown, the biological waste treatment device includes: a pyrolysis gasification device, a biogas tank, a purification device and a gas storage tank. The pyrolysis gasification device is used to convert dry waste in the biomass waste into synthesis gas that can replace natural gas fuel, and store the synthesis gas in the gas storage tank. The biogas tank is used to ferment wet waste in the biomass waste to produce biogas. The purification device is used to purify the biogas, and store the purified biogas in the gas storage tank.

[0048] Specifically, the biomass waste generated by the plantations and farms on the island is separated into dry and wet parts. The dry biomass waste is pyrolyzed and converted into synthesis gas that can replace natural gas fuel. The wet part is purified through anaerobic fermentation into high-quality biogas that meets natural gas standards, thereby meeting gas demand.

[0049] In an optional embodiment, if Figure 1 As shown, the system also includes: a seaweed feeding area, in which the seaweed in the seaweed feeding area is used to supplement the biogas fermentation raw materials.

[0050] Specifically, the seaweed in the seaweed feeding area balances the amount of biomass waste to ensure the supply of high-quality biogas. For example, when the waste straw and animal manure produced by the island plantations and island breeding gardens are small and insufficient to support the biogas digester to produce enough biogas, the seaweed in the seaweed feeding area supplements the biogas fermentation raw materials to ensure the stability of biogas supply.

[0051] In an embodiment of the present invention, the system is equipped with a seaweed feeding area, which takes advantage of the fact that seaweed has a large number of reproductions and large individuals, and is a good raw material for biogas fermentation. The system uses seaweed as a raw material to produce biogas locally. The high-quality biogas in the gas storage tank, the hydrogen in the hydrogen storage tank, and the natural gas in the methane reactor provide fuel for the hydrogen-blended gas turbine. The generated electricity provides a stable power supply for the island. The tail gas after the heat energy is utilized by the waste heat boiler and lithium bromide cascade enters the methane reactor through the carbon capture device to supply fuel for the hydrogen-blended gas turbine, thus realizing recycling. The natural gas and hydrogen required for hydrogen-blended gas turbines, fuel cells and other equipment can be generated through the multiple utilization of hydrogen energy and biogas in the system. The system does not require external gas supply, and the ability to operate on an isolated island is realized.

[0052] In an optional embodiment, if Figure 1 As shown, the fresh water treatment unit includes: a membrane desalination device, a thermal desalination device and a fresh water reservoir, wherein the membrane desalination device and the thermal desalination device are used to desalinate seawater and send the desalinated seawater into the fresh water reservoir.

[0053] Specifically, the system is equipped with a membrane desalination device and a thermal desalination device, which jointly ensure the safety of fresh water supply.

[0054] In an optional embodiment, if Figure 1 As shown, the system also includes: a flood diversion ditch and a rainwater regulating pool, wherein the flood diversion ditch is used to collect rainwater and send the rainwater to the rainwater regulating pool.

[0055] Specifically, the system is equipped with flood diversion ditches and rainwater regulating pools to collect rainwater resources on the island, and uses recycled and processed rainwater and ship ballast fresh water as supplementary water sources to complement seawater desalination.

[0056] In an optional embodiment, if Figure 1 As shown, the system also includes: a soil source heat pump, a seawater source heat pump and a water quality treatment unit, wherein the soil source heat pump and the seawater source heat pump provide diverse heat energy supplies for the island, and the water generated by the soil source heat pump and the seawater source heat pump is sent to the fresh water reservoir through the water quality treatment unit.

[0057] Specifically, the system is equipped with soil source heat pumps and seawater source heat pumps, taking advantage of the island's geomorphic advantages that combine land and sea features to provide a clean, efficient, stable and reliable basic energy supply. The heat energy generated by electric boilers, thermal energy storage devices, lithium bromide units, soil source heat pumps and seawater source heat pumps is fed into the heat network to power the thermal desalination device, ensuring that the thermal desalination device still has the ability to produce fresh water when the membrane desalination device is unavailable due to power supply problems.

[0058] In an optional embodiment, if Figure 1As shown, the system also includes: a land-based mobile energy storage vehicle and an offshore power storage ship, wherein the land-based mobile energy storage vehicle and the offshore power storage ship are used to supply electricity and energy to the island in extreme situations.

[0059] Specifically, when extreme situations such as tsunamis, typhoons, earthquakes, and wars occur on islands, mobile energy storage vehicles on land and offshore power storage ships will respond quickly to ensure the power supply and energy supply safety of important loads, and ensure that the island microgrid can restore power quickly and efficiently when facing large disturbances.

[0060] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An off-grid ocean island operation system, characterized in that: The system includes: a freshwater treatment unit, an electrolyzer, a floating ocean thermal energy conversion power generation platform, an offshore wind power unit, a solar photovoltaic unit, an island plantation, an island aquaculture garden, a biological waste treatment device, a hydrogen-blended gas turbine, a waste heat boiler and a lithium bromide unit, wherein: The desalinated water treatment unit is used to desalinate the seawater and use the desalinated seawater as a source of fresh water supply for the island, while transporting the desalinated seawater to the electrolytic cell; The electrolyzer uses the electric energy provided by the floating ocean thermal energy conversion power generation platform, the offshore wind power unit, the solar photovoltaic unit, and the water transported by the fresh water treatment unit to produce hydrogen and oxygen; The plantation on the island and the aquaculture garden on the island serve as a source of food supply on the island, and the biomass waste generated by the plantation on the island and the aquaculture garden on the island is converted into gas that can replace natural gas fuel through the biological waste treatment device; The hydrogen-blended gas turbine utilizes the hydrogen transmitted by the electrolyzer and the gas transmitted by the biological waste treatment device to generate electricity to supply the island's electrical load. At the same time, the exhaust gas of the hydrogen-blended gas turbine passes through the waste heat boiler and the lithium bromide unit through the heat network to provide heating and cooling for the island. The water vapor generated by the lithium bromide unit is recovered to the electrolyzer through the fresh water treatment unit.

2. The off-grid ocean island operation system according to claim 1, characterized in that: The system also includes: a hydrogen storage tank and an oxygen storage tank, wherein: The hydrogen storage tank is used to store the hydrogen prepared by the electrolyzer; The oxygen storage tank is used to store the oxygen produced by the electrolyzer; When the amount of hydrogen produced by the electrolyzer fluctuates, the charging and discharging of the hydrogen storage tank is regulated to suppress the fluctuation of the amount of hydrogen.

3. The off-grid ocean island operation system according to claim 1, characterized in that: The system also includes: a thermal energy storage device and an electric boiler, wherein: When the heat supply of the hydrogen-blended gas turbine is greater than the heat load, starting the thermal energy storage device to store heat; When the heating amount of the hydrogen-blended gas turbine is less than the heat load, the thermal energy storage device is started to release heat or the electric boiler is started to supplement the heat supply.

4. The off-grid ocean island operation system according to claim 2, characterized in that: The system further comprises: a carbon capture device and a methane reactor, wherein: The carbon capture device is used to recover carbon dioxide from the exhaust gas of the hydrogen-doped gas turbine and transport the recovered carbon dioxide to the methane reactor; The methane reactor converts the carbon dioxide into natural gas which is then supplied to the hydrogen-blended gas turbine again.

5. The off-grid ocean island operation system according to claim 2, characterized in that: The system further comprises a fuel cell, which converts hydrogen in the hydrogen storage tank into electrical energy to supply the island electrical load when the thermal load is less than a preset value.

6. The off-grid ocean island operation system according to claim 1, characterized in that: The biological waste treatment device comprises: a pyrolysis gasification device, a biogas tank, a purification device and a gas storage tank, wherein: The pyrolysis gasification device is used to convert the dry waste in the biomass waste into synthesis gas that can replace natural gas fuel, and store the synthesis gas in the gas storage tank; The biogas tank is used to ferment wet waste in the biomass waste to produce biogas; The purification device is used for purifying biogas and storing the purified biogas in the gas storage tank.

7. The off-grid ocean island operation system according to claim 6, characterized in that: The system further comprises: a seaweed feeding area, and the seaweed in the seaweed feeding area is used to supplement the biogas fermentation raw materials.

8. The off-grid ocean island operation system according to claim 1, characterized in that: The fresh water treatment unit comprises: a membrane desalination device, a thermal desalination device and a fresh water reservoir, wherein the membrane desalination device and the thermal desalination device are used to desalinate seawater and send the desalinated seawater into the fresh water reservoir.

9. The off-grid ocean island operation system according to claim 8, characterized in that: The system further comprises: a flood interception ditch and a rainwater regulating pool, wherein the flood interception ditch is used to collect rainwater and send the rainwater into the rainwater regulating pool.

10. The off-grid ocean island operation system according to claim 9, characterized in that: The system also includes: a soil source heat pump, a seawater source heat pump and a water quality treatment unit, wherein the soil source heat pump and the seawater source heat pump provide diverse heat energy supplies for the island, and the water generated by the soil source heat pump and the seawater source heat pump is sent to the fresh water reservoir through the water quality treatment unit.

11. The off-grid ocean island operation system according to claim 1, characterized in that: The system also includes: a land-based mobile energy storage vehicle and an offshore power storage ship, wherein the land-based mobile energy storage vehicle and the offshore power storage ship are used to supply electricity and energy to the island in extreme situations.

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