An offshore wind turbine cooling system and cooling method

Abstract

The present invention provides an offshore wind turbine cooling system and a cooling method, which relate to the technical field of wind power generation. The offshore wind turbine cooling system includes a seawater extraction system, a hydrogen production system, and a hydrogen refrigeration system arranged in sequence; the seawater extraction system and the hydrogen production system are connected through a seawater supply pipeline; the hydrogen production system and the hydrogen refrigeration system are connected through a hydrogen supply pipeline; the hydrogen refrigeration system includes a hydrogen refrigeration pipeline connected to the hydrogen supply pipeline, and the hydrogen refrigeration pipeline passes through the components to be cooled of the wind turbine. The present invention can solve the problems in the prior art that the refrigeration of offshore wind turbines uses liquid media, has high energy consumption and high cost. The present invention has the effects of not requiring regular replacement of the cooling medium, low energy consumption, small transmission loss, and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly relates to an offshore wind turbine cooling system and a cooling method. Background Art

[0002] An offshore wind turbine includes a wind turbine, blades and a tower barrel. The offshore wind turbine includes a plurality of high-power components, including a transformer and an inverter disposed in the tower barrel. A large amount of heat is generated during their operation, and a rise in temperature will seriously affect their operating performance. Therefore, in order to ensure the normal operation of the wind turbine, a cooling system needs to be equipped to cool the heat-generating components.

[0003] Currently, the cooling systems for high-power components in wind turbines use liquid media, and the cooling media need to be replaced regularly, which has problems of high energy consumption and high cost. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of using liquid media, high energy consumption and high cost in the existing offshore wind turbines, so as to provide an offshore wind turbine cooling system and a cooling method.

[0005] To solve the above problems, on the one hand, the present invention provides an offshore wind turbine cooling system, including a seawater extraction system, a hydrogen production system and a hydrogen refrigeration system arranged in sequence; the seawater extraction system and the hydrogen production system are connected through a seawater supply pipeline; the hydrogen production system and the hydrogen refrigeration system are connected through a hydrogen supply pipeline; the hydrogen refrigeration system includes a hydrogen refrigeration pipeline connected to the hydrogen supply pipeline, and the hydrogen refrigeration pipeline passes through the components to be cooled of the wind turbine.

[0006] Optionally, the hydrogen refrigeration pipeline includes a refrigeration main pipeline communicated with the hydrogen supply pipeline and a first hydrogen refrigeration pipeline and a second hydrogen refrigeration pipeline which are communicated with the refrigeration main pipeline and arranged in parallel. The first hydrogen refrigeration pipeline passes through the environmental heat exchanger of the wind turbine, and the second hydrogen refrigeration pipeline passes through the converter of the wind turbine.

[0007] Optionally, the converter includes an inverter and a transformer; the second hydrogen refrigeration pipeline includes a first refrigeration section and a second refrigeration section connected in series. One end of the first refrigeration section is communicated with the refrigeration main pipeline, and the other end is communicated with the hydrogen inlet of the inverter; one end of the second refrigeration section is communicated with the hydrogen outlet of the inverter, and the other end is communicated with the hydrogen inlet of the transformer.

[0008] Optionally, the inverter is located in the tower barrel of the wind turbine, the transformer is arranged above the inverter, the refrigeration main pipeline extends into the tower barrel from the bottom of the tower barrel, the first refrigeration section is arranged axially along the tower barrel on one side of the inverter, and the second refrigeration section is arranged in parallel with the first refrigeration section on the same side.

[0009] Optionally, the converter includes an inverter and a transformer; one end of the second hydrogen refrigeration pipeline is communicated with the refrigeration main pipeline, and the other end is communicated with the hydrogen inlet of the inverter; a third hydrogen refrigeration pipeline is connected in parallel on the refrigeration main pipeline, one end of the third hydrogen refrigeration pipeline is communicated with the refrigeration main pipeline, and the other end is communicated with the hydrogen inlet of the transformer.

[0010] Optionally, it further includes a hydrogen recovery system, the hydrogen recovery system includes a hydrogen recovery pipeline, the hydrogen recovery pipeline includes a recovery main pipeline and a first recovery pipeline and a second recovery pipeline connected in parallel to the recovery main pipeline, one end of the first recovery pipeline is connected to the hydrogen outlet of the environmental heat exchanger, and the other end is connected to the recovery main pipeline; one end of the second recovery pipeline is connected to the hydrogen outlet of the converter, and the other end is connected to the recovery main pipeline.

[0011] Optionally, the hydrogen recovery system includes a hydrogen booster, and the hydrogen booster is connected to the hydrogen recovery pipeline.

[0012] Optionally, the seawater extraction system includes a seawater filter and a water pump connected to the seawater supply pipeline.

[0013] Optionally, the hydrogen production system includes an electrolytic cell, a hydrogen separator, a hydrogen cooler, a dryer and a gas filter connected in sequence.

[0014] Optionally, the hydrogen production system is close to the tower barrel of the wind turbine generator set and is arranged on the installation platform below the tower barrel.

[0015] Optionally, temperature sensors and pressure sensors are provided at both the input end and the output end of the hydrogen refrigeration pipeline.

[0016] On the other hand, the present invention provides a cooling method for an offshore wind turbine generator set, including the following steps:

[0017] Extract seawater to the hydrogen production system through the seawater extraction system via the seawater supply pipeline;

[0018] Produce cooled hydrogen from the seawater through the hydrogen production system and send it to the hydrogen refrigeration system through the hydrogen supply pipeline;

[0019] The hydrogen passes through the hydrogen refrigeration pipeline through the component to be cooled of the wind turbine generator set to cool the component to be cooled.

[0020] The present invention has the following advantages:

[0021] 1. By using the technical solution of the present invention, through the setting of a seawater extraction system, seawater can be used as the preparation source of the refrigeration medium near the sea, with a short transportation distance of raw materials, obtaining materials locally, making full use of the rich seawater resources without consuming fresh water; effectively using the electric energy of the fan locally with low power cost; through the setting of a hydrogen production system, hydrogen can be produced from seawater; through the setting of a hydrogen refrigeration system, hydrogen is used as the refrigeration medium, and hydrogen is sent to the components to be cooled of the wind turbine generator through a hydrogen refrigeration pipeline for cooling. Using hydrogen refrigeration, compared with using a liquid medium for refrigeration, the cooling medium does not need to be replaced regularly, with low energy consumption, small transmission loss and low cost; compared with air refrigeration, the specific heat of hydrogen is 14 times that of air, with higher heat exchange efficiency; the density of hydrogen is 6.96% of that of air, with smaller transmission loss. The cooling system of the offshore wind turbine generator obtains materials locally, produces hydrogen from seawater, with sufficient raw material supply, short transmission distance and low transportation cost.

[0022] 2. The hydrogen refrigeration pipeline includes a first hydrogen refrigeration pipeline and a second hydrogen refrigeration pipeline arranged in parallel. The first hydrogen refrigeration pipeline passes through the environmental heat exchanger of the wind turbine generator, and the second hydrogen refrigeration pipeline passes through the converter of the wind turbine generator, which can improve the refrigeration efficiency of the refrigeration system for the wind turbine generator.

[0023] 3. By setting a hydrogen recovery system, the hydrogen that absorbs heat can be recycled, with no loss of hydrogen and no cost of the cooling medium.

[0024] 4. The hydrogen production system is close to the tower barrel of the wind turbine generator and is arranged on the installation platform below the tower barrel, which can shorten the distance between the refrigeration medium and the components to be cooled, shorten the transmission distance of the refrigeration medium and reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Shows a schematic structural diagram of the cooling system of the offshore wind turbine generator provided by the embodiment of the present invention;

[0027] Figure 2 Shows a schematic layout diagram of the cooling system of the offshore wind turbine generator provided by the embodiment of the present invention;

[0028] Figure 3 Shows a schematic diagram of the hydrogen flow direction of the hydrogen refrigeration system;

[0029] Figure 4 The flowchart of the cooling method for an offshore wind turbine provided by an embodiment of the present invention is shown.

[0030] Description of the reference numerals:

[0031] 1. Seawater extraction system; 11. Seawater filter; 12. Water pump; 2. Hydrogen production system; 3. Hydrogen refrigeration system; 4. Seawater supply pipeline; 5. Hydrogen supply pipeline; 6. Hydrogen refrigeration pipeline; 61. First hydrogen refrigeration pipeline; 611. Throttle valve; 62. Second hydrogen refrigeration pipeline; 621. First refrigeration section; 622. Second refrigeration section; 63. Refrigeration main pipeline; 7. Wind turbine; 71. Ambient heat exchanger; 72. Converter; 73. Transformer; 8. Hydrogen recovery system; 81. Hydrogen supercharger; 9. Hydrogen recovery pipeline; 91. Recovery main pipeline; 92. First recovery pipeline; 93. Second recovery pipeline; 10. Tower barrel; 20. Installation platform. Detailed implementation manners

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] For the convenience of introducing the technical solution of the present invention, the following will be described in detail with reference to the accompanying drawings and specific embodiments, but the embodiments should not be regarded as a limitation to the present invention.

[0037] Embodiment 1

[0038] A cooling system for an offshore wind turbine generator includes a seawater extraction system 1, a hydrogen production system 2, and a hydrogen refrigeration system 3 arranged in sequence; the seawater extraction system 1 and the hydrogen production system 2 are connected through a seawater supply pipeline 4; the hydrogen production system 2 and the hydrogen refrigeration system 3 are connected through a hydrogen supply pipeline 5; the hydrogen refrigeration system 3 includes a hydrogen refrigeration pipeline 6 connected to the hydrogen supply pipeline 5, and the hydrogen refrigeration pipeline 6 passes through the component to be cooled of the wind turbine generator 7.

[0039] Using the technical solution of the present invention, by setting up the seawater extraction system 1, seawater can be used as the preparation source of the refrigeration medium near the sea, the transportation distance of raw materials is short, materials are obtained locally, and the rich seawater resources are fully utilized without consuming fresh water; the electric energy of the fan is effectively utilized locally, and the power cost is low; by setting up the hydrogen production system 2, hydrogen can be produced from seawater; by setting up the hydrogen refrigeration system 3, hydrogen is used as the refrigeration medium, and hydrogen is sent to the component to be cooled of the wind turbine generator 7 through the hydrogen refrigeration pipeline 6 for cooling. Using hydrogen refrigeration, compared with using a liquid medium for refrigeration, the refrigeration medium does not need to be replaced regularly, the energy consumption is small, the transmission loss is small, and the cost is low; compared with air refrigeration, the specific heat of hydrogen is 14 times that of air, and the heat exchange efficiency is higher; the density of hydrogen is 6.96% of that of air, and the transmission loss is smaller. The cooling system of the offshore wind turbine generator obtains materials locally, uses seawater to produce hydrogen, the raw material supply is sufficient, the transmission distance is short, and the transportation cost is low.

[0040] Optionally, referring to Figures 1-4 , the hydrogen refrigeration pipeline 6 includes a refrigeration main pipeline 63 communicated with the hydrogen supply pipeline 5, and a first hydrogen refrigeration pipeline 61 and a second hydrogen refrigeration pipeline 62 which are communicated with the refrigeration main pipeline 63 and arranged in parallel. The first hydrogen refrigeration pipeline 61 passes through the environmental heat exchanger 71 of the wind turbine generator 7, and the second hydrogen refrigeration pipeline 62 passes through the converter of the wind turbine generator 7. The first hydrogen refrigeration pipeline 61 and the second hydrogen refrigeration pipeline 62 are arranged in parallel, one passes through the environmental heat exchanger 71 and the other passes through the converter, so as to improve the refrigeration efficiency of the refrigeration system for the wind turbine generator 7. Using hydrogen directly as the cooling medium, compared with the liquid cooling medium, due to the low density and small transmission resistance of hydrogen, the loss during the transmission process is small.

[0041] Specifically, the converter of the wind turbine generator 7 includes an inverter 72 and a transformer 73, and the second hydrogen refrigeration pipeline 62 passes through the inverter 72 and the transformer 73 in sequence. Referring to Figure 2 and Figure 3, in this embodiment, inside the tower barrel 10 of the wind turbine generator set, the environmental heat exchanger 71 and the converter are arranged side by side in the radial direction of the tower barrel 10. The converter of the wind turbine generator set 7 is arranged inside the tower barrel 10. Among them, the converter 72 is arranged in the lower part inside the tower barrel 10, and the transformer 73 is arranged above the converter 72. The environmental heat exchanger 71 is arranged on the side of the transformer 73. Therefore, the first hydrogen refrigeration pipeline 61 and the second hydrogen refrigeration pipeline 62 are arranged side by side in the radial direction of the tower barrel 10.

[0042] The second hydrogen refrigeration pipeline 62 includes a first refrigeration section 621 and a second refrigeration section 622 connected in series. One end of the first refrigeration section 621 is communicated with the refrigeration main pipeline 63, and the other end is communicated with the hydrogen inlet of the converter 72; one end of the second refrigeration section 622 is communicated with the hydrogen outlet of the converter 72, and the other end is communicated with the hydrogen inlet of the transformer 73.

[0043] Specifically, in this embodiment, the refrigeration main pipeline 63 extends into the tower barrel 10 from the bottom of the tower barrel 10. The first refrigeration section 621 is arranged along the axial direction of the tower barrel 10 on one side of the converter 72, and the second refrigeration section 622 is arranged in parallel with the first refrigeration section 621 on the same side. Refer to Figure 2 and Figure 3 , for the convenience of pipeline layout, the hydrogen inlet of the converter 72, the hydrogen outlet of the converter 72, the hydrogen inlet of the transformer 73, and the hydrogen outlet of the transformer 73 are all arranged on the same side. Further, the hydrogen inlet and hydrogen outlet of the environmental heat exchanger 71 are arranged on the side close to the hydrogen inlet of the transformer 73. As one preferred implementation manner, the first refrigeration section, the second refrigeration section of the second hydrogen refrigeration pipeline 62, and the first hydrogen refrigeration pipeline 61 are arranged side by side along the axial direction of the tower barrel 10.

[0044] In this embodiment, the hydrogen in the second hydrogen refrigeration pipeline 62 first passes through the converter 72, exchanges heat with the converter 72, then continues to rise, enters the transformer 73, and then exchanges heat and refrigerates the transformer 73.

[0045] Specifically, a converter heat exchanger is arranged inside the converter 72. The hydrogen inlet and hydrogen outlet of the above converter heat exchanger are both heat exchanger flange interfaces, and the first refrigeration section 621 of the second hydrogen refrigeration pipeline 62 is connected to the heat exchanger flange interface; the converter heat exchanger exchanges heat with the heat generated by the converter 72 to realize the cooling of the converter 72. The cooled hydrogen produced by the hydrogen production system 2 passes through the refrigeration main pipeline 63, the first refrigeration section 621, and the heat exchanger flange interface of the second hydrogen refrigeration pipeline 62 and enters the inside of the converter 72, exchanges heat with the heated converter heat exchanger, and cools the cooling medium in the converter heat exchanger, thereby improving the heat exchange efficiency of the converter heat exchanger for the converter 72.

[0046] Similarly, the transformer 73 itself is provided with a variable-pressure heat exchanger, and the hydrogen inlet and hydrogen outlet of the above-mentioned transformer 73 are both heat exchanger flange interfaces. In this embodiment, the heated hydrogen discharged from the current transformer 72 enters the heat exchanger flange interface of the upper-layer transformer 73 along the second refrigeration section 622 of the second hydrogen refrigeration pipeline 62. The hydrogen exchanges heat with the variable-pressure heat exchanger to cool down the variable-pressure heat exchanger, thereby improving the refrigeration effect of the variable-pressure heat exchanger on the transformer 73.

[0047] Since hydrogen indirectly cools the heating equipment by exchanging heat with the heat exchanger of the component to be cooled, hydrogen does not directly flow through the interior of the component to be cooled, and the requirements for sealing and protection of each component to be cooled are low.

[0048] The ambient heat exchanger 71 includes a heat exchange coil, a plate-fin heat exchanger, and an air-cooled heat exchanger.

[0049] The current-exchanging heat exchanger in the current transformer 72 and the variable-pressure heat exchanger in the transformer 73 include two cooling media: air cooling and oil cooling. Hydrogen can exchange heat and cool down heat exchangers with various heat exchange forms and various heat exchange media.

[0050] Of course, in some other embodiments, one end of the second hydrogen refrigeration pipeline 62 is connected to the refrigeration main pipeline 63, and the other end is connected to the hydrogen inlet of the current transformer 72; a third hydrogen refrigeration pipeline is connected in parallel to the refrigeration main pipeline 63, and one end of the third hydrogen refrigeration pipeline is connected to the refrigeration main pipeline 63, and the other end is connected to the hydrogen inlet of the transformer 73.

[0051] A third hydrogen refrigeration pipeline is connected in parallel to the second hydrogen refrigeration pipeline 62. The second hydrogen refrigeration pipeline 62 and the third hydrogen refrigeration pipeline respectively pass through the current transformer 72 and the transformer 73 in the converter, which can further improve the refrigeration efficiency of hydrogen for each component to be cooled.

[0052] Specifically, control valves are provided on both the first hydrogen refrigeration pipeline 61 and the second hydrogen refrigeration pipeline 62. By adjusting the control valves, the flow rate of hydrogen on the first hydrogen refrigeration pipeline 61 and the second hydrogen refrigeration pipeline 62 can be adjusted. Specifically, the control valve includes a throttle valve 611.

[0053] Optionally, the seawater extraction system 1 includes a seawater filter 11 and a water pump 12 that are sequentially connected to the seawater supply pipeline 4. The seawater extraction system 1 is powered by the water pump 12 to extract seawater through the seawater supply pipeline 4, and after being filtered by the seawater filter 11, it is sent to the hydrogen production system 2.

[0054] Optionally, the hydrogen production system 2 includes an electrolytic cell, a hydrogen separator, a hydrogen cooler, a dryer, and a gas filter, which are connected in sequence. Seawater enters the electrolytic cell and is decomposed into hydrogen and oxygen. The hydrogen is separated by the hydrogen separator, cooled down by the hydrogen cooler, dried by the dryer, and finally filtered by the gas filter and then transported to the hydrogen refrigeration system 3 through the hydrogen supply pipeline 5.

[0055] Furthermore, the hydrogen production system 2 further includes an alkali tank, a steam-water separator, a deoxidizer, and a regeneration filter. Specifically, the connection relationship between the devices is as follows in sequence: alkali tank, electrolytic cell, hydrogen separator, hydrogen cooler, steam-water separator, deoxidizer, hydrogen cooler, steam-water separator, regeneration filter, dryer, and gas filter. The hydrogen obtained through the treatment of the above devices is safe, dry, pure, and low-temperature hydrogen, and the hydrogen itself has a pressure of 1.5 Mpa, which can realize the flow in the hydrogen refrigeration pipeline 6, and there is no need to equip a pressurizing pump on the hydrogen refrigeration pipeline 6.

[0056] Furthermore, a water storage tank can be provided upstream of the alkali tank. The seawater extracted through the seawater supply pipeline 4 and filtered can be stored in the water storage tank first, and then the water storage tank supplies seawater to the hydrogen production system 2.

[0057] Optionally, the offshore wind turbine cooling system further includes a hydrogen recovery system 8. The hydrogen recovery system 8 includes a hydrogen recovery pipeline 9. The hydrogen recovery pipeline 9 includes a recovery main pipeline 91 and a first recovery pipeline 92 and a second recovery pipeline 93 connected in parallel to the recovery main pipeline 91. One end of the first recovery pipeline 92 is connected to the hydrogen outlet of the environmental heat exchanger 71, and the other end is connected to the recovery main pipeline 91; one end of the second recovery pipeline 93 is connected to the hydrogen outlet of the converter, and the other end is connected to the recovery main pipeline 91. By setting the hydrogen recovery system 8, the hydrogen that absorbs heat can be recycled, and there is no loss of hydrogen and no cost of cooling medium.

[0058] Specifically, after the hydrogen in the second hydrogen refrigeration pipeline 62 is heated, it is discharged from the heat exchange flange interface of the transformer 73; the hydrogen in the first hydrogen refrigeration pipeline 61 is heated and discharged from the hydrogen outlet of the environmental heat exchanger 71. The heated hydrogen from the two paths converges after coming out of the component to be cooled, and is recovered to the hydrogen recovery system 8 by the hydrogen recovery pipeline 9.

[0059] To improve the compactness and convenience of pipeline layout, the first recovery pipeline 92 and the second recovery pipeline 93 are arranged in parallel along the axial direction of the tower barrel 10. Furthermore, the recovery main pipeline 91 and the refrigeration main pipeline 63 are located at the bottom of the tower barrel 10 and are arranged in parallel along the radial direction of the tower barrel 10.

[0060] Optionally, the hydrogen recovery system 8 includes a hydrogen booster 81, and the hydrogen booster 81 is connected to the hydrogen recovery pipeline 9.

[0061] Optionally, the hydrogen production system 2 is close to the tower 10 of the wind turbine generator 7 and is arranged on the installation platform 20 below the tower 10. The hydrogen production system 2 being close to the tower 10 of the wind turbine generator 7 and arranged on the installation platform 20 below the tower 10 can shorten the distance between the refrigeration medium and the component to be cooled, shorten the transmission distance of the refrigeration medium, and reduce costs. The hydrogen production system 2 is a small device and can be arranged on the installation platform 20 below the tower 10. A sea wind farm has dozens of wind turbine generators 7, and a hydrogen production system 2 can be arranged on the installation platform 20 below the tower 10 of each wind turbine generator 7. The cooled hydrogen produced by the hydrogen production system 2 cools the respective wind turbine generators 7, improving the refrigeration effect on the entire wind farm.

[0062] Optionally, temperature sensors and pressure sensors are provided at both the input end and the output end of the hydrogen refrigeration pipeline 6. By setting the temperature sensors and pressure sensors, the temperature and pressure of the hydrogen at the input end and the output end of the hydrogen refrigeration pipeline 6 can be monitored in real time, so that the control valve on the hydrogen refrigeration pipeline 6 can be adjusted according to the actual situation, and the temperature and pressure of the hydrogen on the hydrogen refrigeration pipeline 6 can be adjusted.

[0063] Embodiment 2

[0064] A cooling method for a sea wind turbine generator uses the sea wind turbine generator cooling system provided in Embodiment 1, with reference to Figure 4 , and includes the following steps:

[0065] Step S01, extracting seawater to the hydrogen production system 2 through the seawater supply pipeline 4 by the seawater extraction system 1;

[0066] Step S02, producing cooled hydrogen from the seawater by the hydrogen production system 2 and sending it to the hydrogen refrigeration system 3 through the hydrogen supply pipeline 5;

[0067] Step S03, the hydrogen passes through the hydrogen refrigeration pipeline 6 through the component to be cooled of the wind turbine generator 7 to cool the component to be cooled.

[0068] Optionally, in step S01, the seawater is extracted by the water pump 12, filtered by the seawater filter 11, and then transported to the hydrogen production system 2 through the seawater supply pipeline 4.

[0069] Optionally, in step S02, the seawater enters the alkali tank to form an alkali solution, which is pumped into the electrolytic cell by the alkali solution pump. The electrolytic cell uses the electric energy provided by the wind turbine generator 7 to electrolyze the seawater, and hydrogen is prepared through the hydrogen separator.

[0070] Further, hydrogen gas passes through a hydrogen cooler to cool down the hydrogen gas. After that, steam-water separation, deoxidation, cooling, steam-water separation, regeneration filtration, drying, and filtration are carried out in sequence. Finally, pure, dry, and cooled hydrogen gas is obtained and supplied to the hydrogen refrigeration system 3 through the hydrogen gas supply pipeline 5. In the existing air cooling, since the air contains impurities such as dust and salt mist, it enters the equipment during the heat exchange process, resulting in an increase in maintenance requirements. After the hydrogen gas undergoes the above treatment, it is pure and dry and will not affect the equipment.

[0071] Optionally, in step S03, the hydrogen gas is transported through the hydrogen gas supply pipeline 5 to the hydrogen refrigeration pipeline 6 and is divided into two parts, which respectively enter the first hydrogen refrigeration pipeline 61 and the second hydrogen refrigeration pipeline 62. The first hydrogen refrigeration pipeline 61 passes through the ambient heat exchanger 71, which can cool down the internal environment of the tower barrel 10. The second hydrogen refrigeration pipeline 62 passes through the converter 72 and the transformer 73 in sequence to cool down the converter 72 and the transformer 73. During this period, the temperature and pressure of the hydrogen gas in the first hydrogen refrigeration pipeline 61 and the second hydrogen refrigeration pipeline 62 can be monitored in real time through temperature sensors and pressure sensors, which is convenient for adjusting the temperature and pressure of the hydrogen gas.

[0072] Optionally, the cooling method for an offshore wind turbine generator set further includes the following steps:

[0073] Step S04, recovering the hydrogen gas after heat exchange and temperature rise.

[0074] Specifically, in step S04, the hydrogen gas is recovered through the hydrogen gas recovery pipeline. The hydrogen gas can be recovered into the hydrogen gas storage tank or transported to the land through the submarine pipeline.

[0075] Further, the hydrogen gas in the hydrogen gas recovery pipeline is pressurized by the hydrogen gas booster 81 to increase the pressure of the hydrogen gas and enhance the driving force of the hydrogen gas flow.

[0076] According to the above description, the present patent application has the following advantages:

[0077] 1. Using hydrogen gas for refrigeration, compared with using liquid media for refrigeration, the cooling medium does not need to be replaced regularly, with low energy consumption, small transmission loss, low cost, and higher heat exchange efficiency and smaller transmission loss compared with air refrigeration;

[0078] 2. Using seawater to produce hydrogen, the raw material supply is sufficient, the transmission distance is short, and the transportation cost is low;

[0079] 3. The hydrogen refrigeration pipeline 6 is divided into the first hydrogen refrigeration pipeline 61 and the second hydrogen refrigeration pipeline 62 arranged in parallel, which can improve the refrigeration efficiency of the refrigeration system for the wind turbine generator set 7;

[0080] 4. By setting up the hydrogen gas recovery system 8, the hydrogen gas that absorbs heat can be recovered and utilized, with no loss of hydrogen gas and no cost of the cooling medium;

[0081] 5. The hydrogen production system 2 is close to the tower barrel 10 of the wind turbine generator set 7 and is arranged on the installation platform 20 below the tower barrel 10, which can shorten the distance between the refrigeration medium and the component to be cooled, shorten the transmission distance of the refrigeration medium, and reduce the cost.

[0082] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A cooling system for an offshore wind turbine generator, characterized in that, It includes a seawater extraction system (1), a hydrogen production system (2), and a hydrogen refrigeration system (3) arranged in sequence; The seawater extraction system (1) and the hydrogen production system (2) are connected by a seawater supply pipeline (4); The hydrogen production system (2) and the hydrogen refrigeration system (3) are connected by a hydrogen supply pipeline (5); The hydrogen refrigeration system (3) includes a hydrogen refrigeration pipeline (6) connected to the hydrogen supply pipeline (5), and the hydrogen refrigeration pipeline (6) passes through the component to be cooled of the wind turbine generator set (7); The hydrogen refrigeration pipeline (6) includes a refrigeration main pipeline (63) communicated with the hydrogen supply pipeline (5), and a first hydrogen refrigeration pipeline (61) and a second hydrogen refrigeration pipeline (62) which are communicated with the refrigeration main pipeline (63) and arranged in parallel. The first hydrogen refrigeration pipeline (61) passes through the environmental heat exchanger (71) of the wind turbine generator set (7), and the second hydrogen refrigeration pipeline (62) passes through the converter of the wind turbine generator set (7); The converter includes an inverter (72) and a transformer (73); The second hydrogen refrigeration pipeline (62) includes a first refrigeration section (621) and a second refrigeration section (622) connected in series. One end of the first refrigeration section (621) is communicated with the refrigeration main pipeline (63), and the other end is communicated with the hydrogen inlet of the inverter (72); One end of the second refrigeration section (622) is communicated with the hydrogen outlet of the inverter (72), and the other end is communicated with the hydrogen inlet of the transformer (73); The inverter (72) is located in the tower barrel (10) of the wind turbine generator set (7), the transformer (73) is arranged above the inverter (72), the refrigeration main pipeline (63) extends into the tower barrel (10) from the bottom of the tower barrel (10), the first refrigeration section (621) is arranged along the axial direction of the tower barrel (10) on one side of the inverter (72), and the second refrigeration section (622) is arranged in parallel with the first refrigeration section (621) on the same side.

2. The cooling system for an offshore wind turbine generator according to claim 1, wherein, It further includes a hydrogen recovery system (8), and the hydrogen recovery system (8) includes a hydrogen recovery pipeline (9). The hydrogen recovery pipeline (9) includes a recovery main pipeline (91), and a first recovery pipeline (92) and a second recovery pipeline (93) connected in parallel to the recovery main pipeline (91). One end of the first recovery pipeline (92) is connected to the hydrogen outlet of the environmental heat exchanger (71), and the other end is connected to the recovery main pipeline (91); One end of the second recovery pipeline (93) is connected to the hydrogen outlet of the converter, and the other end is connected to the recovery main pipeline (91).

3. The cooling system for an offshore wind turbine generator according to claim 2, characterized in that, The hydrogen recovery system (8) includes a hydrogen booster (81), and the hydrogen booster (81) is connected to the hydrogen recovery pipeline (9).

4. The cooling system for an offshore wind turbine generator according to claim 1, characterized in that, The hydrogen production system (2) is close to the tower barrel (10) of the wind turbine generator set (7) and is arranged on the installation platform (20) below the tower barrel (10).

5. The cooling system for an offshore wind turbine generator according to claim 1, characterized in that, Temperature sensors and pressure sensors are provided at both the input end and the output end of the hydrogen refrigeration pipeline (6).

6. A cooling method for an offshore wind turbine generator, characterized in that, Adopt the cooling system for an offshore wind turbine generator according to any one of claims 1 to 5, including the following steps: Extract seawater to the hydrogen production system (2) through the seawater supply pipeline (4) by means of the seawater extraction system (1); Produce cooled hydrogen from the seawater through the hydrogen production system (2), and send it to the hydrogen refrigeration system (3) through the hydrogen supply pipeline (5); The hydrogen passes through the hydrogen refrigeration pipeline (6) through the component to be cooled of the wind turbine generator (7) to cool the component to be cooled.

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