Ship low-carbon power equipment coupled with wind, light and pressure storage

Abstract

The utility model discloses a ship low-carbon power device coupled with wind and light pressure storage. The ship low-carbon power device comprises a photovoltaic power generation device; a wind power generation device; the supercritical carbon dioxide Brayton cycle device comprises a compression structure, an intercooler, a high-pressure storage tank, a reheater, a turbine and a low-pressure storage tank which are sequentially connected to form a carbon dioxide circulation loop. Wherein the number of the reheaters is at least two, and the reheaters comprise the first reheater and the second reheater which are sequentially arranged in the flowing direction of carbon dioxide; the diesel engine is used for supplying power to a power grid on the ship and the compression structure; the output ends of the photovoltaic power generation device and the wind power generation device are respectively connected with the power grid and the compression structure; the first turbine and the second turbine are connected with a power grid; and the second reheater is connected with a flue gas output port of the diesel engine so as to recover waste heat in the flue gas. The ship low-carbon power equipment coupled with wind, light and pressure storage can realize stable supply of ship electric power while reducing carbon and pollution.

Description

Technical Field

[0001] The utility model relates to the technical field of energy, and in particular to a low-carbon ship power equipment coupled with wind, solar and pressure storage. Background Art

[0002] Sea transportation is the main channel for international freight, and 95% of China's foreign trade import and export cargo is transported by sea. According to research by the International Maritime Organization (IMO), global shipping ships consume an average of 325 million tons of oil each year, and greenhouse gas emissions account for about 2.8% of the world's total emissions, and NO emissions account for about 1.3% of the world's total emissions. x 、SO x They account for about 15% and 13% of the global total emissions respectively. In response to the climate crisis and environmental pollution, the 77th session of the IMO Marine Environment Protection Committee required the shipping industry to achieve near-zero greenhouse gas emissions by 2050. The solution to such energy efficiency and pollutant emission issues in ship transportation is imminent.

[0003] As renewable energy sources, solar and wind energy can not only meet the standard of low cost, but also have the characteristics of cleanliness and wide distribution, and almost no pollutants and greenhouse gases are produced. Applying solar and wind energy to ship energy systems can greatly reduce the use of fuel, have high environmental benefits, and help reduce carbon emissions. However, traditional ship wind and solar power generation devices are intermittent, volatile and uncertain, which will directly affect the transient and steady-state operation of the entire ship power system. The energy storage methods such as batteries and supercapacitors widely used in the current shipbuilding industry have disadvantages such as low energy density, short operating life, long charging time, high maintenance costs, and waste pollution, and cannot achieve long-term energy supply. The compressed CO2 energy storage system has many advantages such as high energy storage density, low economic cost, high cycle efficiency, long operating life, small equipment size, and negative carbon emissions. It can effectively improve the intermittent and volatile problems of new energy power generation. Under the limited available space of the ship, it can improve the safety and reliability of the ship as much as possible and achieve long-term energy storage, which meets the needs of my country's large-scale long-term energy storage system construction and sustainable development.

[0004] In addition, diesel engines that use heavy oil as their main fuel are currently the most widely used power systems in the shipbuilding industry. However, only about 50% of the thermal energy in ship diesel engines is converted into useful work, and most of the remaining heat is discharged in the form of exhaust gas, which makes the fuel thermal efficiency low. At the same time, heavy oil will also produce extremely high emissions of pollutants such as nitrogen oxides when burned, which will cause high pollution to the environment.

[0005] In view of this, it is necessary to design a low-carbon ship power equipment that couples wind, solar and pressure storage to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a low-carbon power equipment for ships that utilizes a supercritical carbon dioxide Brayton cycle device to solve the problem of unstable system energy supply caused by the randomness and volatility of wind and solar energy sources, and utilizes wind and light for complementary power generation, while also recovering and utilizing the waste heat of ship diesel engine flue gas to improve the thermal efficiency of the fuel, which is highly coupled, low-pollution, and low-energy-consuming coupled wind-solar pressure storage.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A low-carbon ship power device coupled with wind, solar and pressure storage, comprising:

[0009] Photovoltaic devices, used to convert solar energy into electrical energy;

[0010] Wind power generation device, used for converting wind energy into electrical energy;

[0011] A supercritical carbon dioxide Brayton cycle device, comprising a compression structure, an intercooler, a high-pressure storage tank, a reheater, a turbine and a low-pressure storage tank which are sequentially connected to form a carbon dioxide circulation loop; wherein at least two reheaters are provided, including a first reheater and a second reheater which are sequentially arranged along the flow direction of the carbon dioxide;

[0012] a diesel engine for supplying power to the vessel's electrical grid and to said compression structure;

[0013] The output ends of the photovoltaic power generation device and the wind power generation device are respectively connected to the power grid and the compression structure for supplying electricity to the power grid and the compression structure; the turbine is connected to the power grid to supply electricity to the power grid using the supercritical carbon dioxide Brayton cycle device; the first reheater is also connected to the intercooler, so that a cold source and heat source recovery and utilization structure is formed inside the supercritical carbon dioxide Brayton cycle device; the second reheater is connected to the flue gas output port of the diesel engine to recover the waste heat in the flue gas.

[0014] As a further improvement of the present invention, a cold treatment device is also connected between the first reheater and the intercooler, so that the heat exchange medium flowing out from the cold side outlet of the first reheater is treated by the cold treatment device and flows into the intercooler and then flows back to the first reheater, forming a heat exchange medium circulation loop for recycling cold sources and heat sources.

[0015] As a further improvement of the present invention, the cold treatment device includes a cooler for reducing the temperature of the heat exchange medium.

[0016] As a further improvement of the utility model, a precooler is also provided between the turbine and the low-pressure storage tank.

[0017] As a further improvement of the present invention, the cold side outlet of the first reheater is connected to the precooler, so that the heat exchange medium flows out of the first reheater and flows into the cold treatment device after passing through the precooler.

[0018] As a further improvement of the present invention, the compression structure is a two-stage compressor unit, including a first compressor and a second compressor arranged along the flow direction of the carbon dioxide.

[0019] As a further improvement of the present invention, the output ends of the photovoltaic power generation device and the wind power generation device are respectively connected to the first compressor and the second compressor to supply power to the first compressor and the second compressor at the same time.

[0020] As a further improvement of the present invention, the output end of the first compressor is connected to a first intercooler, and the output end of the second compressor is connected to a second intercooler.

[0021] As a further improvement of the utility model, a generator is also connected between the turbine and the power grid.

[0022] The beneficial effects of the utility model are:

[0023] 1. The utility model generates electricity by coupling clean, environmentally friendly, renewable, widely available and highly complementary solar energy and wind energy, and uses a supercritical carbon dioxide Brayton cycle device to store electricity from wind and solar energy. When the sunlight and wind power are insufficient at sea, the electricity stored in the supercritical carbon dioxide Brayton cycle device is provided to the ship, thereby ensuring the continuity, reliability and stability of the ship's power supply system, improving the energy utilization efficiency of the ship, reducing the energy consumption and pollutant emissions of the ship, and improving the flexibility of system regulation, effectively promoting the green transformation of ships and achieving carbon reduction and pollution reduction.

[0024] 2. The utility model connects the solar photovoltaic power generation device and the wind power generation device to the power grid and the supercritical carbon dioxide Brayton cycle device respectively. On the one hand, it can use solar energy and wind energy for complementary power generation; on the other hand, in addition to using solar energy and wind energy for direct energy supply, it can also use the supercritical carbon dioxide Brayton cycle device to store excess solar energy and wind energy, and use the supercritical carbon dioxide Brayton cycle device to smooth the fluctuations of solar energy and wind energy, thereby maximizing the utilization of energy.

[0025] 3. The utility model uses supercritical carbon dioxide as a working fluid and utilizes the Brayton cycle to recover the waste heat of diesel engine flue gas, which can effectively improve the utilization efficiency of energy and avoid wasting flue gas waste heat resources.

[0026] 4. The utility model can fully recycle and utilize the energy released by the heat exchange medium of the first reheater and the intercooler by combining the first reheater with the intercooler, thereby realizing the recycling of the internal energy of the supercritical carbon dioxide Brayton cycle device.

[0027] 5. The utility model's low-carbon ship power equipment coupled with wind-solar compression and storage improves the energy utilization efficiency of the wind-solar power generation system through compression and energy storage technology. At the same time, it combines with diesel engines to provide flexible power scheduling and backup power supply, thereby achieving efficient and stable ship power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the low-carbon ship power equipment coupled with wind, solar and pressure storage according to the utility model.

[0029] Reference numerals

[0030] 10. Photovoltaic power generation device; 20. Wind power generation device; 31. Low-pressure storage tank; 321. First compressor; 322. Second compressor; 331. First intercooler; 332. Second intercooler; 34. High-pressure storage tank; 351. First reheater; 352. Second reheater; 361. First turbine; 362. Second turbine; 363. Generator; 37. Precooler; 381. First control valve; 382. Second control valve; 391. Cooler; 392. Cold water tank; 393. Hot water tank; 40. Diesel engine; 41. Shaft generator; 50. Power grid. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0033] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0034] See also Figure 1 As shown, the utility model provides a low-carbon ship power equipment coupled with wind, solar and pressure storage, including:

[0035] Photovoltaic power generation device 10, used for converting solar energy into electrical energy;

[0036] A wind power generation device 20, used for converting wind energy into electrical energy;

[0037] A supercritical carbon dioxide Brayton cycle device, comprising a compression structure, an intercooler, a high-pressure storage tank 34, a reheater, a turbine and a low-pressure storage tank 31 which are sequentially connected to form a carbon dioxide circulation loop; wherein at least two reheaters are provided, including a first reheater 351 and a second reheater 352 which are sequentially arranged along the flow direction of carbon dioxide;

[0038] A diesel engine 40 for supplying power to a power grid 50 on board the vessel and to the compression structure;

[0039] The output ends of the photovoltaic power generation device 10 and the wind power generation device 20 are respectively connected to the power grid 50 and the compression structure for supplying electricity to the power grid 50 and the compression structure; the turbine is connected to the power grid 50 to supply electricity to the power grid 50 using the supercritical carbon dioxide Brayton cycle device; the first reheater 351 is also connected to the intercooler, so that a cold source and heat source recovery and utilization structure is formed inside the supercritical carbon dioxide Brayton cycle device; the second reheater 352 is connected to the flue gas output port of the diesel engine 40 to recover the waste heat of the flue gas.

[0040] Specifically, the output ends of the photovoltaic power generation device 10 and the wind power generation device 20 are respectively connected to the power grid 50 and the compression structure. On the one hand, they can use solar energy and wind energy for complementary power generation to supply electricity to the power grid 50; on the other hand, in addition to using solar energy and wind energy to directly supply energy, they can also use a supercritical carbon dioxide Brayton cycle device to store excess solar energy and wind energy, that is, the photovoltaic power generation device 10 and the wind power generation device 20 provide electricity to the compression structure, so that the compression structure compresses carbon dioxide for energy storage, and then the supercritical carbon dioxide Brayton cycle device can be used to smooth the fluctuations of solar energy and wind energy, and the two unstable and discontinuous energy sources of wind energy and solar energy can be stored and utilized to maximize the utilization of energy.

[0041] Specifically, the compression structure is a two-stage compressor unit, including a first compressor 321 and a second compressor 322 arranged along the flow direction of carbon dioxide. Correspondingly, there are two reheaters and turbines, the input end of the first reheater 351 is connected to the high-pressure storage tank 34, the output end of the first reheater 351 is connected to the first turbine 361, and the output end of the second reheater 352 is connected to the second turbine 362, that is, the high-pressure storage tank 34, the first reheater 351, the first turbine 361, the second reheater 352, and the second turbine 362 are connected in sequence. The setting of the two-stage compressor unit can maximize the cycle efficiency and energy storage density of the supercritical carbon dioxide Brayton cycle device, and ensure the operation effect and energy saving effect of the supercritical carbon dioxide Brayton cycle device.

[0042] Specifically, the output ends of the photovoltaic power generation device 10 and the wind power generation device 20 are respectively connected to the first compressor 321 and the second compressor 322 to supply power to the first compressor 321 and the second compressor 322 at the same time.

[0043] The output end of the first compressor 321 is connected to the first intercooler 331, and the output end of the second compressor 322 is connected to the second intercooler 332, that is, the first compressor 321, the first intercooler 331, the second compressor 322, and the second intercooler 332 are connected in sequence, and the output end of the second intercooler 332 is connected to the input end of the high-pressure storage tank 34, so that the low-temperature and low-pressure carbon dioxide in the low-pressure storage tank 31 is processed by the first compressor 321, the first intercooler 331, the second compressor 322, and the second intercooler 332 to form a low-temperature and high-pressure carbon dioxide working medium stored in the high-pressure storage tank 34 for energy storage.

[0044] Specifically, in the heat source recovery and utilization, the first reheater 351 is connected to the intercooler, and the second reheater 352 is connected to the flue gas outlet of the diesel engine 40. This allows the high-temperature heat exchange medium flowing out from the hot side of the intercooler to flow into the first reheater 351 in the carbon dioxide circulation loop to heat the low-temperature and high-pressure carbon dioxide flowing out from the high-pressure storage tank 34, and then the first turbine 361 is used to convert the thermal energy; the high-temperature flue gas flowing out of the flue gas outlet reheats the relatively low-temperature and high-pressure carbon dioxide flowing out of the first turbine 361, and the second turbine 362 converts the thermal energy, so that the heat in the high-temperature heat exchange medium obtained after the heat exchange treatment of the intercooler and the waste heat of the flue gas can be recovered and utilized. In particular, the high-temperature heat exchange medium flowing out of the intercooler can only serve as a heat source for the first reheater 351. If the intercooler is connected to the second reheater 352 and the flue gas outlet is connected to the first reheater 351, the carbon dioxide may still be at a relatively high temperature after energy conversion by the first turbine 361, resulting in poor heating effect of the high-temperature heat exchange medium on the carbon dioxide in the second reheater 352, thereby reducing the thermal utilization efficiency of the high-temperature heat exchange medium and affecting the recovery and utilization effect of the cold source and heat source inside the supercritical carbon dioxide Brayton cycle device.

[0045] Specifically, a precooler 37 is further provided between the second turbine 362 and the low-pressure storage tank 31 , and the cold side outlet of the first reheater 351 is connected to the precooler 37 .

[0046] Specifically, it also includes a cold treatment device, which includes a cooler 391 and a cold water tank 392. The precooler 37 is connected to the cooler 391, the cold water tank 392 and the intercooler in sequence. The low-temperature heat exchange medium flowing out of the cold side outlet of the first reheater 351 undergoes cold and heat exchange in the precooler 37, and then flows into the cold water tank 392 after being cooled by the cooler 391. The output port of the cold water tank 392 is connected to the first intercooler 331 and the second intercooler 332 respectively, so as to provide a cold source for the first intercooler 331 and the second intercooler 332; after the cold and heat exchange, the high-temperature heat exchange medium flowing out of the hot side outlet of the first intercooler 331 and the second intercooler 332 flows back to the first reheater 351, so that a heat exchange medium circulation loop for recycling cold sources and heat sources is formed inside the supercritical carbon dioxide Brayton cycle device.

[0047] A hot water tank 393 is further provided between the first intercooler 331 , the second intercooler 332 and the first reheater 351 .

[0048] Exemplarily, the output end of the diesel engine 40 is connected to a shaft belt generator 41, and the output ends of the shaft belt generator 41 are respectively connected to the power grid 50 and the first compressor 321 and the second compressor 322, so that the diesel engine 40 can be used to provide electrical energy to the power grid 50, and the diesel engine 40 can also be used to provide electrical energy to the two compressors as needed.

[0049] Specifically, a first control valve 381 is provided between the low-pressure storage tank 31 and the first compressor 321, and a second control valve 382 is provided between the high-pressure storage tank 34 and the first reheater 351. The operation of the supercritical carbon dioxide Brayton cycle device can be adjusted as needed by controlling the valve state.

[0050] Specifically, a generator 363 is connected between the first turbine 361 and the second turbine 362 and the power grid 50 , and the generator 363 is driven by the turbine to generate electricity, thereby supplying electricity to the power grid 50 using a supercritical carbon dioxide Brayton cycle device.

[0051] Specifically, the wind power generation device 20 is provided with a steering structure, so that when the wind force is insufficient to generate electricity, it is convenient to adjust the steering according to the wind direction to avoid the wind power generation device 20 causing ship resistance. The steering structure can be set according to the existing technology and will not be described in detail here.

[0052] The working principle of the low-carbon power equipment for ships coupled with wind-solar pressure storage of the utility model is described below:

[0053] When there is abundant sunlight and wind power at sea, the photovoltaic power generation device 10 and the wind power generation device 20 convert solar energy and wind energy into electrical energy. Part of the converted electrical energy is used to supply the power grid 50, and the other part is used to power the compressor. The compressor is controlled to compress carbon dioxide, and then the solar energy and wind energy are stored through the supercritical carbon dioxide Brayton cycle device; at the same time, the supercritical carbon dioxide Brayton cycle device and the diesel engine 40 also supply part of the electrical energy to the power grid 50, wherein the flue gas in the diesel engine 40 is recycled through the second reheater 352. In this mode, the power grid 50 is mainly supplied by the power converted from solar energy and wind energy;

[0054] When there is insufficient sunlight and wind power at sea, the photovoltaic power generation device 10 and the wind power generation device 20 cannot operate, or the electric energy converted by the photovoltaic power generation device 10 and the wind power generation device 20 is too low to be used as the main electric energy supply for the power grid 50, the supercritical carbon dioxide Brayton cycle device is used to supply electric energy, and at the same time, the diesel engine 40 also supplies part of the electric energy for the power grid 50, wherein the diesel engine 40 provides electric energy for the compressor, and the flue gas in the diesel engine 40 is recycled through the second reheater 352. In this mode, the electric energy of the power grid 50 is mainly supplied by the supercritical carbon dioxide Brayton cycle device.

[0055] Specifically, the operation of the supercritical carbon dioxide Brayton cycle device is as follows:

[0056] During energy storage, the photovoltaic power generation device 10 and the wind power generation device 20 supply electric energy to the compressor, the low-temperature and low-pressure carbon dioxide in the low-pressure storage tank 31 is processed by the first compressor 321 to obtain high-temperature and high-pressure carbon dioxide, the first intercooler 331 cools the high-temperature and high-pressure carbon dioxide, and then the carbon dioxide is further compressed by the second compressor 322, the second intercooler 332 cools the high-temperature and high-pressure carbon dioxide flowing out of the second compressor 322, and obtains low-temperature and high-pressure carbon dioxide and places it in the high-pressure storage tank 34 to realize the storage of solar energy and wind energy;

[0057] When releasing energy, the low-temperature and high-pressure carbon dioxide in the high-pressure storage tank 34 flows into the first reheater 351, and is heated by the first reheater 351 to obtain high-temperature and high-pressure carbon dioxide. The high-temperature and high-pressure carbon dioxide flows into the first turbine 361 for energy conversion. At the same time, the first turbine 361 drives the generator 363 to generate electricity, so that the thermal energy and pressure energy of the carbon dioxide are converted into electrical energy and supplied to the power grid 50. Then, the carbon dioxide with relatively low pressure and temperature flowing out of the first turbine 361 flows into the second reheater 352 again and is heated by the waste heat provided by the flue gas to obtain a carbon dioxide working medium with increased temperature and still having a certain pressure. The carbon dioxide working medium flows into the second turbine 362 for energy conversion. At the same time, the second turbine 362 drives the generator 363 to generate electricity, so that the thermal energy and pressure of the carbon dioxide working medium are again converted into electrical energy and supplied to the power grid 50, thereby realizing energy release. The low-temperature and low-pressure carbon dioxide flowing out of the second turbine 362 is processed by the precooler 37 and flows into the low-pressure storage tank 31.

[0058] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A low-carbon ship power equipment coupled with wind, solar, pressure and storage, characterized in that: include: Photovoltaic devices, used to convert solar energy into electrical energy; Wind power generation device, used for converting wind energy into electrical energy; A supercritical carbon dioxide Brayton cycle device, comprising a compression structure, an intercooler, a high-pressure storage tank, a reheater, a turbine and a low-pressure storage tank which are sequentially connected to form a carbon dioxide circulation loop; wherein at least two reheaters are provided, including a first reheater and a second reheater which are sequentially arranged along the flow direction of the carbon dioxide; a diesel engine for supplying power to the vessel's electrical grid and to said compression structure; The output ends of the photovoltaic power generation device and the wind power generation device are respectively connected to the power grid and the compression structure; the turbine is connected to the power grid; the first reheater is also connected to the intercooler, so that a cold source and heat source recovery and utilization structure is formed inside the supercritical carbon dioxide Brayton cycle device; the second reheater is connected to the flue gas output port of the diesel engine to recover the waste heat in the flue gas.

2. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 1 is characterized by: A cold treatment device is also connected between the first reheater and the intercooler, so that the heat exchange medium flowing out from the cold side outlet of the first reheater is treated by the cold treatment device and then flows into the intercooler and then flows back to the first reheater, forming a heat exchange medium circulation loop for recycling cold sources and heat sources.

3. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 2 is characterized by: The cold treatment device includes a cooler for reducing the temperature of the heat exchange medium.

4. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 2 is characterized by: A precooler is also arranged between the turbine and the low-pressure storage tank.

5. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 4 is characterized by: The cold side outlet of the first reheater is connected to the precooler, so that the heat exchange medium flows out of the first reheater and flows into the cold treatment device after passing through the precooler.

6. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 1 is characterized by: The compression structure is a two-stage compressor unit, comprising a first compressor and a second compressor arranged along the flow direction of the carbon dioxide.

7. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 6 is characterized by: The output ends of the photovoltaic power generation device and the wind power generation device are respectively connected to the first compressor and the second compressor to supply power to the first compressor and the second compressor at the same time.

8. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 6 is characterized by: The output end of the first compressor is connected to a first intercooler, and the output end of the second compressor is connected to a second intercooler.

9. The low-carbon marine power equipment coupled with wind, solar, pressure and storage according to claim 1 is characterized by: A generator is also connected between the turbine and the power grid.

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