Offshore wind power energy storage ship and offshore wind power transportation method

Abstract

The application discloses a kind of offshore wind power energy storage ships and offshore wind power transport method, offshore wind power energy storage ship in the present application includes the air liquefaction system for being set on the hull from offshore wind power system to obtain power to liquefy air, for storing liquefied air liquefied air storage system and for heating the power generation system of gasification liquefied air, it realizes that offshore unstable wind energy is transported to near shoreline by ship to carry out long-term stable output reliable, continuous and sufficient quality electric power, multiple ships shuttle back and forth can realize flexible use of wind power, offshore wind power energy storage ship in the present application and offshore wind power transport method are high in safety, strong in environmental adaptability, weak in influence to marine environment, high in comprehensive energy utilization rate, beneficial to reduce the construction and maintenance cost of electric power transmission system, eliminate the limit of land power grid to fluctuation offshore wind power grid connection, suitable for application in various offshore wind power field electric power transport occasion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore wind power, and in particular to an offshore wind power energy storage ship and an offshore wind power transportation method. BACKGROUND

[0002] Offshore wind power has the advantages of large wind power, large single machine capacity, long power generation time, etc., and offshore wind power is developing in the direction of large-scale, large-scale, deep sea, and multi-energy integration. In the field of offshore wind power transmission, the mode of submarine cable power transmission is usually adopted, or the mode of converting wind power into hydrogen energy for transportation. For the mode of transmitting wind power through submarine cable, the construction cost of high-power, long-distance cross-sea cable transmission and offshore substation platform is high, and the maintenance is difficult, not only the flexible dispatching capability is poor, but also the grid connection of fluctuating offshore wind power is limited, and the natural disaster resistance capability is weak, and the marine environment is affected. For the mode of converting wind power into hydrogen energy for transmitting wind power, there are technical problems of poor safety and low comprehensive energy utilization efficiency. SUMMARY

[0003] In view of the defects in the prior art, the present application provides an offshore wind power energy storage ship and an offshore wind power transportation method to solve the technical problems of high cost, difficult maintenance and low efficiency in the prior art.

[0004] In order to achieve the above-mentioned purpose of the application, the technical scheme provided by the present application is as follows:

[0005] An offshore wind power energy storage ship, comprising a ship body, an air liquefaction system for obtaining power from an offshore wind power system to liquefy air, a liquefied air storage system for storing the air liquefied by the air liquefaction system, a power generation system for heating and gasifying the liquefied air to drive a generator to generate power, and a full-revolution propulsion system for providing power for the navigation of the ship body, the liquefied air inlet of the power generation system being connected with the liquefied air outlet of the liquefied air storage system, and the power generation system being electrically connected with a ground power grid.

[0006] In an embodiment, the liquefied air storage system is arranged in a cabin of the ship body, and the air liquefaction system and the power generation system are arranged on a deck of the ship body.

[0007] In an embodiment, the air liquefaction system comprises a multi-stage compressor unit, an air compression-expansion integrated machine, a cooler, a throttle valve, a gas-liquid separator, and a cryogenic accumulator, the offshore wind power system is electrically connected to the multi-stage compressor unit, an outlet of the multi-stage compressor unit is connected to an inlet of a compressor of the air compression-expansion integrated machine, an outlet of the compressor of the air compression-expansion integrated machine is connected to an air-side inlet of the cooler, an air-side outlet of the cooler is connected to an inlet of an expander of the air compression-expansion integrated machine, an outlet of the expander is connected to an inlet of the throttle valve, an outlet of the throttle valve is connected to an inlet of the gas-liquid separator, a liquid-phase outlet of the gas-liquid separator is connected to a liquefied air inlet of a liquefied air storage system, and the cryogenic accumulator stores cold energy and delivers the cold energy to the cooler.

[0008] In an embodiment, the air liquefaction system further comprises an air washing tower, an inlet of the air washing tower is connected to the atmosphere, and an outlet of the air washing tower is connected to an inlet of the multi-stage compressor unit.

[0009] In an embodiment, the gas-phase air discharged from the gas-liquid separator is combined with air discharged from the outlet of the air washing tower after absorbing heat in the cooler and then enters the multi-stage compressor unit again.

[0010] In an embodiment, the liquefied air storage system comprises a plurality of cryogenic tanks and a high-pressure pump, a liquid-phase outlet of the gas-liquid separator is connected to an inlet of the cryogenic tank, an outlet of the cryogenic tank is connected to an inlet of the high-pressure pump, and an outlet of the high-pressure pump is connected to a liquefied air inlet of a power generation system.

[0011] In an embodiment, the power generation system comprises a cold energy recovery device, a heater, a turbine, and a generator, a cold-side inlet of the cold energy recovery device is connected to an outlet of the high-pressure pump, a cold-side outlet of the cold energy recovery device is connected to a cold-side inlet of the heater, a cold-side outlet of the heater is connected to an inlet of the turbine, the turbine is connected to the generator, the generator is electrically connected to a ground power grid, an outlet of the turbine is connected to a hot-side inlet of the cold energy recovery device, a hot-side outlet of the cold energy recovery device is connected to an air inlet of the cryogenic accumulator, and the cryogenic accumulator stores the cold energy recovered by the cold energy recovery device.

[0012] In an embodiment, the cryogenic accumulator is filled with a first phase change material, the first phase change material is one of dimethyl sulfoxide solution, propylene glycol solution, or eutectic salt, and cold energy in the cryogenic accumulator is released to the cooler of the air liquefaction system through a low-temperature circulating working medium.

[0013] In an embodiment, the heater is provided with heat energy by a heat storage device, the heat storage device comprises a plurality of filling tanks, the filling tanks are filled with a second phase change material, and the second phase change material is one of industrial paraffin, potassium nitrate, or sodium nitrate.

[0014] In an embodiment, the heat in the heat storage device is the heat generated by compressed air in an air liquefaction system, and the heat generated by compressed air in the air liquefaction system is recovered to the heat storage device by heat conducting oil or water.

[0015] The application also provides a method for transporting offshore wind power, which comprises the following steps: moving the offshore wind power transport ship to a target offshore wind power system, electrically connecting the offshore wind power system with an air liquefaction system on the ship body, liquefying air on site to store energy for wind power, disconnecting the offshore wind power system from the air liquefaction system when the air liquefaction system is full of liquefied air, moving the ship body full of liquefied air to the shore, and electrically connecting a power generation system on the ship body with a ground power grid when the ground power is needed, and integrating the power generated by the power generation system into the ground power grid.

[0016] In an embodiment, the power of the full-revolution propulsion system during the movement of the ship body is from the power generation system on the ship body.

[0017] Compared with the prior art, the application has at least the following beneficial effects:

[0018] The application realizes the reliable, continuous and sufficient output of power by transporting unstable offshore wind power to the shore by ship, and the flexible use of wind power can be realized by the shuttle of multiple ships. The offshore wind power storage ship and the offshore wind power transportation method in the application have high safety, strong environmental adaptability, weak influence on the marine environment, and high comprehensive energy utilization rate. The application is conducive to reducing the construction and maintenance cost of the power transmission system, eliminating the limitation of the land power grid on the fluctuating offshore wind power grid connection, and is suitable for power transmission occasions of various offshore wind farms. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the offshore wind power storage ship in the embodiment of the application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the application more clear and obvious, the application will be described below by specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the application.

[0021] The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used in the description of the present disclosure and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It also will be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0022] It should be understood that, although the terms first, second, third, etc. can be used herein to describe various information, but these information should not be limited to these terms, and cannot be understood as indicating or implying relative importance. These terms are only used to distinguish one type of information from another type of information. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as meaning "when" or "upon" or "in response to determining".

[0023] In the description of the present application, unless otherwise specified and limited, it is necessary to explain that the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be mechanical connection, or the communication between the two elements inside, it can be direct connection, or indirect connection through intermediate medium, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] In order to better understand the technical scheme of the present application, the present application will be described in detail below in conjunction with the drawings.

[0025] The embodiment provides a sea wind power energy storage ship, which comprises a ship body, an air liquefaction system, a liquefied air storage system, a power generation system and a full-rotation propulsion system 15 are arranged on the ship body, the air liquefaction system is used for liquefying air, the liquefied air storage system is used for storing air liquefied by the air liquefaction system, the liquefied air in the liquefied air storage system is heated and gasified in the power generation system, the expanded air after gasification drives the generator 17 in the power generation system to generate power, the sea wind power system 16 is electrically connected with the air liquefaction system, so that electric energy is provided for air liquefaction, the power generation system is electrically connected with the ground power grid 18, so that the electric energy generated by the power generation system is integrated into the power grid, and the full-rotation propulsion system 15 is used to provide power for running of the ship body.

[0026] As shown in Figure 1 The air liquefaction system comprises a multi-stage compressor unit 2, an air compression and expansion integrated machine 3, a cooler 4, a throttle valve 5, an air-liquid separator 6 and a low-temperature cold storage device 12, the liquefied air storage system comprises a plurality of low-temperature tanks 7 and a high-pressure pump 8, and the power generation system comprises a cold energy recovery device 9, a heater 10, a turbine 11 and a generator 17.

[0027] The offshore wind power system 16 is electrically connected with the multi-stage compressor unit 2, the outlet of the multi-stage compressor unit 2 is connected with the inlet of the compressor 31 of the air compression and expansion integrated machine 3, the outlet of the compressor 31 of the air compression and expansion integrated machine 3 is connected with the air side inlet of the cooler 4, the air side outlet of the cooler 4 is connected with the inlet of the expander 32 of the air compression and expansion integrated machine 3, the outlet of the expander 32 is connected with the inlet of the multi-throttle valve 5, the outlet of the multi-throttle valve 5 is connected with the inlet of the gas-liquid separator 6, the liquid phase outlet of the gas-liquid separator 6 is connected with the inlet of the low-temperature tank 7, the outlet of the low-temperature tank 7 is connected with the inlet of the high-pressure pump 8, the outlet of the high-pressure pump 8 is connected with the cold side inlet of the cold energy recovery device 9, the cold side outlet of the cold energy recovery device 9 is connected with the cold side inlet of the heater 10, the cold side outlet of the heater 10 is connected with the inlet of the turbine 11, the turbine 11 is connected with the generator 17, the generator 17 is electrically connected with the ground power grid 18, the outlet of the turbine 11 is connected with the hot side inlet of the cold energy recovery device 9, the hot side outlet of the cold energy recovery device 9 is connected with the air inlet of the low-temperature cold storage device 12, the low-temperature cold storage device 12 stores the cold energy recovered by the recovery device 9 and delivers the cold energy to the cooler 4.

[0028] The offshore wind power system 16 provides electric energy for the operation of the multi-stage compressor unit 2, the multi-stage compressor unit 2 compresses air, the compressed air is compressed again in the compressor 31, the air compressed again is cooled in the cooler 4, the cooled air is expanded in the expander 32 to obtain compressed air with a lower temperature than the outlet of the cooler 4, the low-temperature compressed air forms a mixture of low-temperature gaseous air and liquid air through the multi-throttle valve 5, the mixture is subjected to gas-liquid separation in the gas-liquid separator 6, the liquid air enters the low-temperature tank 7 for storage. The high-pressure pump 8 delivers the liquid air in the low-temperature tank 7 to the power generation system, the liquid air is heated and gasified in the cold energy recovery device 9 and the heater 10 to form cryogenic gas, the cryogenic gas flows into the expander 8, the expander 8 is connected with the generator 9, the cryogenic gas does work in the turbine 11 to drive the turbine 11 to drive the generator 17 to generate electric energy, the generator 17 is electrically connected with the power grid 18, and the electric energy generated by the generator 17 is incorporated into the power grid 18.

[0029] The cryogenic gas does work in the turbine 11 to form residual cold gas, the residual cold gas heats the liquid air from the low-temperature tank 7 for the first time in the cold energy recovery device 9, the residual cold gas releases heat to absorb heat in the low-temperature cold storage device 12 to generate cold energy, and the cold energy in the low-temperature cold storage device 12 cools the compressed air in the cooler 4.

[0030] The inlet of the multi-stage compressor unit 2 is connected with the outlet of the air washing tower 1, so as to remove solid particles and part of water vapor in the air. In the embodiment, the low-temperature cold storage device 12 is a multi-tube phase change cold storage tank, the cooler 4 is a multi-channel cooler, the first phase change material is filled in the multi-tube phase change cold storage tank 12, and the first phase change material is one of dimethyl sulfoxide solution, propylene glycol solution or eutectic salt. The cold energy in the low-temperature cold storage device 12 is released to the cooler 4 of the air liquefaction system through the low-temperature circulating working medium 13 in the cold circulation pipeline.

[0031] The heater 10 is provided with heat energy by the heat storage device 14, the heat storage device 14 includes a plurality of filling tanks, the filling tanks are filled with the second phase change material, and the second phase change material is one of industrial paraffin, potassium nitrate or sodium nitrate. In order to improve the energy utilization rate, the heat of the heat storage device 14 is the heat generated by the multi-stage compressor unit 2 and / or the air compression and expansion integrated machine 3 of the air liquefaction system, and the heat generated by the compressed air in the air liquefaction system is recovered to the heat storage device 14 through the heat-conducting oil or water.

[0032] The electric power of the full-rotation propelling system 15 comes from the power generation system or the storage battery on the ship body. The gaseous phase air discharged from the gas-liquid separator 6 is combined with the air discharged from the outlet of the air washing tower 1 again after absorbing heat in the cooler 4, and then enters the multi-stage compressor unit 2 again, so that the already cooled air is used multiple times, and the energy utilization rate is improved. The low-temperature tank 7 in the embodiment is a C-shaped double-ear low-temperature tank suitable for storing liquid air.

[0033] In order to keep the center of gravity of the ship body balanced, the liquefied air storage system is arranged in the cabin of the ship body, and the air liquefaction system and the power generation system are arranged on the deck of the ship body.

[0034] The embodiment also provides a sea wind power transportation mode. The sea wind power system 16 is moved to a target place by the above-mentioned sea wind power transportation ship, the sea wind power system 16 is electrically connected with the air liquefaction system on the ship body, the liquefied air on site is used to store energy of wind power, when the low-temperature tank 7 is full of the liquefied air, the sea wind power system 16 is disconnected with the air liquefaction system, the ship body full of the liquefied air is moved to the shore, and when the ground power is needed, the power generation system on the ship body is electrically connected with the ground power grid, and the electric power generated by the power generation system is integrated into the ground power grid.

[0035] During the movement of the ship body, the electric power of the full-rotation propelling system 15 comes from the power generation system on the ship body, and the transportation of the ship body can be realized without additional energy or greenhouse gas emission during the movement of the ship body.

[0036] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by the equivalent ones without departing from the spirit of the technical solutions of the present application, and all of them should be covered in the technical solution range claimed by the present application.

Claims

1. An offshore wind energy storage vessel comprising a hull, characterized in that, The ship body is provided with an air liquefaction system powered by the offshore wind power system to liquefy air, a liquefied air storage system for storing liquefied air, a power generation system for heating the liquefied air to gasify the liquefied air to drive a generator to generate power, and a full-revolution propulsion system for providing power for the ship body to sail, the liquefied air inlet of the liquefied air storage system is connected with the liquefied air outlet of the air liquefaction system, the liquefied air inlet of the power generation system is connected with the liquefied air outlet of the liquefied air storage system, and the power generation system is electrically connected with a ground power grid. The liquefied air storage system is arranged in a cabin of the ship body, and the air liquefaction system and the power generation system are arranged on a deck of the ship body. The air liquefaction system comprises a multi-stage compressor unit, an air compression and expansion integrated machine, a cooler, a throttle valve, a gas-liquid separator and a low-temperature cold storage device, the offshore wind power system is electrically connected with the multi-stage compressor unit, the outlet of the multi-stage compressor unit is connected with the inlet of the compressor of the air compression and expansion integrated machine, the outlet of the compressor of the air compression and expansion integrated machine is connected with the air side inlet of the cooler, the air side outlet of the cooler is connected with the inlet of the expander of the air compression and expansion integrated machine, the outlet of the expander is connected with the inlet of the throttle valve, the outlet of the throttle valve is connected with the inlet of the gas-liquid separator, the liquid phase outlet of the gas-liquid separator is connected with the liquefied air inlet of the liquefied air storage system, and the low-temperature cold storage device stores cold energy and delivers the cold energy to the cooler.

2. The offshore wind energy storage ship according to claim 1, characterized in that, The air liquefaction system further comprises an air washing tower, the inlet of the air washing tower is communicated with the atmosphere, and the outlet of the air washing tower is connected with the inlet of the multi-stage compressor unit.

3. The offshore wind energy storage ship according to claim 2, characterized in that, The gas phase air discharged from the gas-liquid separator is combined with the air discharged from the outlet of the air washing tower again after absorbing heat in the cooler and then enters the multi-stage compressor unit again.

4. The offshore wind energy storage ship according to claim 1, characterized in that, The liquefied air storage system comprises a plurality of low-temperature tanks and a high-pressure pump, the liquid phase outlet of the gas-liquid separator is connected with the inlet of the low-temperature tank, the outlet of the low-temperature tank is connected with the inlet of the high-pressure pump, and the outlet of the high-pressure pump is connected with the liquefied air inlet of the power generation system.

5. The offshore wind energy storage ship according to claim 4, characterized in that, The power generation system comprises a cold energy recovery device, a heater, a turbine and a generator, the cold side inlet of the cold energy recovery device is connected with the outlet of the high-pressure pump, the cold side outlet of the cold energy recovery device is connected with the cold side inlet of the heater, the cold side outlet of the heater is connected with the inlet of the turbine, the turbine is connected with the generator, the generator is electrically connected with the ground power grid, the outlet of the turbine is connected with the hot side inlet of the cold energy recovery device, the hot side outlet of the cold energy recovery device is connected with the air inlet of the low-temperature cold storage device, and the low-temperature cold storage device stores the cold energy recovered by the recovery device.

6. The offshore wind energy storage ship according to claim 5, characterized in that, The low-temperature cold storage device is a multi-tube phase change cold storage tank, and the cooler is a multi-channel cooler.

7. The offshore wind energy storage ship according to claim 6, characterized in that, The low-temperature cold storage device is filled with a first phase change material, the first phase change material is one of dimethyl sulfoxide solution, propylene glycol solution or eutectic salt, and the cold energy in the low-temperature cold storage device is released to the cooler of the air liquefaction system through a low-temperature circulating working medium.

8. The offshore wind energy storage ship according to claim 5, characterized in that, The heater is provided with heat energy by a heat storage device, the heat storage device comprises a plurality of filling tanks, the filling tanks are filled with a second phase change material, and the second phase change material is one of industrial paraffin, potassium nitrate or sodium nitrate.

9. The offshore wind energy storage ship according to claim 8, characterized in that, The heat in the heat storage device is the heat generated by compressed air in the air liquefaction system, and the heat generated by compressed air in the air liquefaction system is recovered to the heat storage device through heat-conducting oil or water.

10. A method of offshore wind power transportation, c h a r a c t e r i s e d i n that The offshore wind power system is connected to the air liquefaction system on the ship body, and the wind energy is stored by liquefied air on site. When the liquefied air storage system is full of liquefied air, the offshore wind power system is disconnected from the air liquefaction system, and the ship body full of liquefied air is driven to the shore. When the ground power is needed, the power generation system on the ship body is connected to the ground power grid, and the power generated by the power generation system is integrated into the ground power grid.

11. A method according to claim 10, c h a r a c t e r i s e d i n that During the driving of the ship body, the power of the full-revolution propulsion system comes from the power generation system on the ship body.

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