Front-end filter of seawater cooling system, seawater cooling system and wind turbine generator unit

Abstract

The application provides a front-end filter of a seawater cooling system, the seawater cooling system and a wind turbine generator set. The front-end filter comprises a first electrode including a first electrode base and a plurality of first perforations penetrating through the first electrode base; a second electrode spaced apart from the first electrode by a predetermined distance, including a second electrode base and a plurality of second perforations penetrating through the second electrode base, wherein one of the first electrode and the second electrode comprises a titanium base material with a ruthenium-iridium alloy coating, and the other of the first electrode and the second electrode comprises a nickel alloy, and seawater for the seawater cooling system enters a pipeline of the seawater cooling system after penetrating through the first perforations and the second perforations. The front-end filter according to the application can effectively remove marine organisms attached to the electrode filter screen.

Description

Technical Field

[0001] This invention relates to the field of wind power technology, specifically to a front-end filter for a seawater cooling system, a seawater cooling system, and a wind turbine generator set. Background Technology

[0002] The front-end filters of seawater cooling systems are located below the water surface. Considering the high cleanliness of deep-sea water, the front-end filters installed at the water intake are mostly made of inexpensive carbon steel, bearing a significant risk of failure due to biofouling. Once severe biofouling occurs, the mesh will become clogged, seriously affecting water intake efficiency and the system's operational safety.

[0003] Traditionally, the front-end filters in seawater pipeline systems are not treated with any anti-fouling measures because they can be manually inspected, maintained, and replaced at any time, whether in coastal power plants or on surface ships. Following this approach, typical front-end filters are simply replaced with new ones when they become dirty or corroded.

[0004] However, offshore wind power systems are characterized by large wind farm areas, long distances from shore, and difficult and costly maintenance. If marine organisms adhere to the front-end filter, causing blockage, it will affect the operation of the entire system. Therefore, the long-term anti-fouling capability of the front-end filter must be considered from the initial design stage of the offshore wind turbine water-cooling system. This is crucial for improving system operating efficiency, ensuring system safety during service, and reducing system maintenance costs. Summary of the Invention

[0005] One object of the present invention is to provide a front-end filter capable of effectively removing marine organisms attached to an electrode filter screen, a seawater cooling system including the front-end filter, and a wind turbine generator set.

[0006] Another objective of this invention is to provide a front-end filter that can effectively avoid fouling and improve the service life of the front-end filter, a seawater cooling system including the front-end filter, and a wind turbine generator set.

[0007] According to one aspect of the present invention, a front-end filter for a seawater cooling system is provided, the front-end filter comprising: a first electrode including a first electrode substrate and a plurality of first perforations passing through the first electrode substrate; and a second electrode spaced at a predetermined distance from the first electrode, including a second electrode substrate and a plurality of second perforations passing through the second electrode substrate, wherein one of the first electrode and the second electrode comprises a titanium substrate having a ruthenium-iridium alloy coating, and the other of the first electrode and the second electrode comprises a nickel alloy, wherein seawater for the seawater cooling system enters the pipe of the seawater cooling system after passing through the first perforations and the second perforations.

[0008] Optionally, the first electrode substrate forms an outer cylinder, and the second electrode substrate forms an inner cylinder, wherein the second electrode substrate is disposed inside the first electrode substrate and is electrically isolated from the first electrode substrate.

[0009] Optionally, the open end of the first electrode substrate is connected to a first electrode terminal piece, and the open end of the second electrode substrate is connected to a second electrode terminal piece.

[0010] Optionally, the front-end filter further includes a plurality of insulating support rods, one end of which is fixed to the first electrode substrate and the other end of which is fixed to the second electrode substrate, so that the first electrode substrate and the second electrode substrate are insulated and isolated from each other.

[0011] Optionally, the first electrode substrate includes an outer sidewall and an outer bottom wall, and the second electrode substrate includes an inner sidewall and an inner bottom wall, wherein the distance between the outer sidewall and the inner sidewall is equal to the distance between the outer bottom wall and the inner bottom wall.

[0012] Optionally, along the axial direction of the front-end filter, the diameter of the first electrode substrate gradually increases from the end opposite to the opening end of the first electrode substrate to the opening end of the first electrode substrate, and the diameter of the second electrode substrate gradually increases from the end opposite to the opening end of the second electrode substrate to the opening end of the second electrode substrate.

[0013] Optionally, the first electrode and the second electrode can operate in a DC constant current / constant voltage mode or a pulse constant current / constant voltage mode.

[0014] Optionally, the first electrode further includes a first flange disposed at the upper end of the first electrode, and the second electrode further includes a second flange disposed at the upper end of the second electrode, wherein the first electrode terminal piece is connected to the first flange, and the second electrode terminal piece is connected to the second flange.

[0015] According to another aspect of the present invention, a seawater cooling system is provided, the seawater cooling system comprising a front-end filter as described above.

[0016] According to another aspect of the present invention, a wind turbine generator set is provided, the wind turbine generator set including the seawater cooling system as described above.

[0017] This invention, by setting up a front-end filter including a first electrode and a second electrode, can prevent marine organisms from attaching to the electrode filter screen through electrolysis technology, thereby ensuring the normal operation of the seawater cooling system.

[0018] The anode of this invention is a titanium composite electrode (DSA anode) with a ruthenium-iridium alloy coating that has good electrolytic chlorine evolution activity in seawater, and the cathode is a Monel nickel alloy cathode with good seawater corrosion resistance. This ensures the corrosion resistance and electrolysis efficiency of the filter screen in the seawater environment, thereby improving the stability and service life of the system.

[0019] This invention improves the filtration effect by setting the front-end filter as a two-layer cylindrical structure, while cooling water can enter the pipe through the side wall and bottom wall, thus increasing the seawater intake speed.

[0020] This invention, by using a pulsed electrolysis operating mode, can effectively control electrode failure caused by cathode calcium and magnesium deposition, and greatly extend electrode life. Attached Figure Description

[0021] The above and other objects, features and advantages of the present invention will become clearer from the following detailed description taken in conjunction with the accompanying drawings.

[0022] Figure 1 This is a schematic structural diagram of a front-end filter according to an embodiment of the present invention.

[0023] Figure 2 This is a perspective view of a front-end filter according to an embodiment of the present invention.

[0024] Figure 3 This is an axial cross-sectional view of the front-end filter according to an embodiment of the present invention.

[0025] Figure 4 yes Figure 3 An enlarged view of part I.

[0026] Figure 5 and Figure 6 This is a schematic diagram of the working mode according to an embodiment of the present invention.

[0027] Figure label: 100 front-end filters 110 First Electrode 110A First Electrode Connector 110B Second Electrode Connector 111 First electrode substrate 111a Outer wall 111b Outer bottom wall 112 Perforation 112 First perforation 113 end 114 First flange 120 Second Electrode 121 Second electrode substrate 121a Inner wall 121b inner bottom wall 122 perforation 122 Second perforation 123 End 124 Second flange 130 Insulating Support Rod 200 pipes 210 flange 310 First Insulation Pad 320 Second Insulation Pad 330 Insulating pad. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] Front-end filter of seawater cooling system The following will refer to Figures 1 to 6 A front-end filter of a seawater cooling system according to an embodiment of the present invention is described in detail.

[0032] Figure 1 This is a schematic structural diagram of a front-end filter according to an embodiment of the present invention. Figure 2 This is a perspective view of a front-end filter according to an embodiment of the present invention. Figure 3 This is an axial cross-sectional view of the front-end filter according to an embodiment of the present invention. Figure 4 yes Figure 3 An enlarged view of part I. Figure 5 and Figure 6 This is a schematic diagram of the working mode according to an embodiment of the present invention.

[0033] like Figures 1 to 3As shown, the front-end filter 100 according to an embodiment of the present invention may include: a first electrode 110, including a first electrode substrate 111 and a plurality of first perforations 112 passing through the first electrode substrate 111; and a second electrode 120, spaced apart from the first electrode 110 by a predetermined distance, including a second electrode substrate 121 and a plurality of second perforations 122 passing through the second electrode substrate 121, wherein one of the first electrode 110 and the second electrode 120 includes a titanium substrate with a ruthenium-iridium alloy coating, and the other of the first electrode 110 and the second electrode 120 includes a nickel alloy, and seawater for the seawater cooling system enters the pipe 200 of the seawater cooling system after passing through the first perforations 112 and the second perforations 122.

[0034] Hereinafter, the invention will be described with the example of a first electrode 110 comprising a nickel alloy and thus serving as a cathode, and a second electrode 120 comprising a titanium substrate having a ruthenium-iridium alloy coating and thus serving as an anode. However, the invention is not limited thereto, and the first electrode 110 may also comprise a titanium substrate having a ruthenium-iridium alloy coating and the second electrode 120 may comprise a nickel alloy.

[0035] According to an embodiment of the present invention, the first electrode 110 may comprise a nickel alloy resistant to seawater corrosion. The first electrode 110 may serve as a cathode and be connected to the positive terminal of a power source, for example, by means of... Figure 3 The first electrode terminal 110A shown is connected to the positive terminal of the power supply (e.g., as shown in the diagram). Figure 1 (As shown). Additionally, the second electrode 120 may include a titanium substrate with a ruthenium-iridium alloy coating that has good chlorine evolution catalytic ability. The second electrode 120 can be used as an anode and can be connected to the negative terminal of a power source, for example, via... Figure 3 The second electrode terminal 110B shown is connected to the negative terminal of the power supply (e.g., as shown in the diagram). Figure 1 (As shown).

[0036] According to an embodiment of the present invention, the first electrode 110 has a plurality of perforations 112 and the second electrode 120 has a plurality of perforations 122. Therefore, the first electrode 110 and the second electrode 120 can be used as electrode filters capable of filtering and undergoing electrolytic reactions. By applying a DC voltage to the first electrode 110 and the second electrode 120, chloride ions and hydrogen gas are generated. These two gases work together on the surface of the electrode filter to prevent biofouling. Therefore, the present invention can prevent marine organisms from attaching to the electrode filter using electrolysis technology, thereby ensuring the normal operation of the seawater cooling system.

[0037] According to an embodiment of the present invention, when power is supplied to the first electrode 110 and the second electrode 120 using a power source, the following reactions, as shown in Formulas 1 to 5, can occur.

[0038] (1) Equation 1 represents the cathode reaction that occurs on the first electrode 110, in which water molecules are reduced to hydrogen gas and hydroxide ions on the first electrode 110 when seawater passes through the first perforation 112.

[0039] (2) Equation 2 represents the anodic reaction that occurs on the second electrode 120, in which chloride ions are oxidized to generate chlorine gas.

[0040] (3) (4) Equations 3 and 4 represent chemical reactions in seawater, in which chlorine gas generated at the anode reacts with NaOH to form sodium hypochlorite. Sodium hypochlorite has strong oxidizing properties and can kill organisms attached to the filter screen.

[0041] (5) Equation 5 represents the overall reaction of the electrolysis reaction.

[0042] According to embodiments of the present invention, based on formulas 1 to 5 above, the front-end filter 100 can achieve a fouling prevention effect through the physical and chemical actions described below.

[0043] Physical action: The hydrogen gas generated on the first electrode 110 and the chlorine gas generated on the second electrode 120 can form bubbles. The bubbling action of these bubbles can physically detach the biological spores and larvae from the first electrode 110 and the second electrode 120.

[0044] Chemical action: Sodium hypochlorite can effectively kill organisms attached to the first electrode 110 and the second electrode 120 through its toxic effect, thereby inhibiting the growth and development of organisms.

[0045] Furthermore, according to embodiments of the present invention, the synergistic effect of hydrogen bubbles, chlorine bubbles and sodium hypochlorite generated by electrolysis can not only achieve self-cleaning of the surfaces of the first electrode 110 and the second electrode 120, but also inhibit biological adhesion for a long time, thus achieving long-term anti-fouling.

[0046] Furthermore, according to embodiments of the present invention, by selecting a nickel alloy and a titanium substrate with a ruthenium-iridium alloy coating, the corrosion resistance and electrolytic efficiency of the filter screen in a seawater environment are ensured, thereby improving the stability and service life of the system.

[0047] According to embodiments of the present invention, the nickel alloy may include at least one of copper, iron, manganese, etc., in addition to nickel. Furthermore, according to embodiments of the present invention, a titanium substrate with a ruthenium-iridium alloy coating may include a titanium substrate and a surface coating formed of a ruthenium-iridium alloy.

[0048] According to an embodiment of the present invention, the first electrode 110 may be made of a nickel alloy mesh, and the second electrode 120 may be made of a titanium substrate composite electrode mesh with a ruthenium-iridium alloy coating.

[0049] According to embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the first electrode substrate 111 can form an outer cylinder, and the second electrode substrate 121 can form an inner cylinder. The second electrode substrate 121 is disposed inside the first electrode substrate 111 and electrically isolated from it. Therefore, the front-end filter 100, which has an inner and outer cylindrical structure formed by the first electrode substrate 111 and the second electrode substrate 121, can improve the filtration effect while allowing cooling water to enter the pipe 200 through the side and bottom walls of the cylindrical structure, thus increasing the cooling water inlet speed.

[0050] According to embodiments of the present invention, such as Figure 1 As shown, the upper end of the front-end filter 100 can be connected to the pipe 200 of the seawater cooling system. Seawater can enter the pipe 200 after passing through the side and bottom walls of the front-end filter 100, sequentially through the first perforation 112 of the outer first electrode 110 and the second perforation 122 of the inner second electrode 120. The first perforation 112 can be evenly distributed on the side and bottom walls of the first electrode 110, and the second perforation 122 can be evenly distributed on the side and bottom walls of the second electrode 120. The aperture of the first perforation 112 and the second perforation 122 is not specifically limited, but can be adjusted according to the design or flow rate.

[0051] According to an embodiment of the present invention, the first electrode 110 and the second electrode 120 may be separated by a predetermined distance. As an example, such as... Figure 1 As shown, the front-end filter 100 may also include a plurality of insulating support rods 130. One end of the insulating support rod 130 is fixed to the first electrode substrate 111, and the other end of the insulating support rod 130 is fixed to the second electrode substrate 121, so that the first electrode substrate 111 and the second electrode substrate 121 are insulated and isolated, thereby ensuring the effective progress of the electrolysis reaction and avoiding short circuits between electrodes.

[0052] According to embodiments of the present invention, such as Figure 1 As shown, the first electrode substrate 111 may include an outer sidewall 111a and an outer bottom wall 111b, and the second electrode substrate 121 may include an inner sidewall 121a and an inner bottom wall 121b. The distance between the outer sidewall 111a and the inner sidewall 121a may be equal to the distance between the outer bottom wall 111b and the inner bottom wall 121b. According to an embodiment of the present invention, by making the distance between the outer sidewall 111a and the inner sidewall 121a equal to the distance between the outer bottom wall 111b and the inner bottom wall 121b, the voltage between the first electrode 110 and the second electrode 120 at each position can be kept substantially equal, thereby ensuring that the electrolysis reaction proceeds efficiently and evenly.

[0053] According to embodiments of the present invention, such as Figure 2 As shown, along the axial direction of the front-end filter 100, the diameter of the first electrode substrate 111 gradually increases from the end opposite to the opening end 113 of the first electrode substrate 111 to the opening end 113 of the first electrode substrate 111, and the diameter of the second electrode substrate 121 gradually increases from the end opposite to the opening end 123 of the second electrode substrate 121 to the opening end 123 of the second electrode substrate 121. In other words, the front-end filter 100 can be formed into a cone-shaped structure, which is beneficial for improving filtration efficiency and filtration effect.

[0054] Although the above description describes the front-end filter 100 as having a cone-like structure, the present invention does not limit the specific shape of the front-end filter 100. For example, the front-end filter 100 may also be formed in a cylindrical shape or as shown in the figure. Figure 1 The structure shown is a cone at the bottom and a cylinder at the top.

[0055] According to embodiments of the present invention, such as Figure 4 As shown, the first electrode 110 may further include a first flange 114 disposed at the upper end of the first electrode 110, and the second electrode 120 may further include a second flange 124 disposed at the upper end of the second electrode 120, in combination with Figure 2 The first electrode terminal 110A can be connected to the first flange 114, and the second electrode terminal 110B can be connected to the second flange 124.

[0056] According to an embodiment of the present invention, a first insulating pad 310 may be provided on the upper part of the second flange 124, a second insulating pad 320 may be provided on the lower part of the first flange 114, and an insulating block 330 may be provided between the first flange 114 and the second flange 124, thereby preventing the first flange 114 and the second flange 124 from being electrically connected or from undesired connections between the first flange 114 and the second flange 124 and external sources. Additionally, according to an embodiment of the present invention, the flange 210 of the pipe 200 may be connected to the first insulating pad 310 to connect the front-end filter 100 to the pipe 200.

[0057] According to an embodiment of the present invention, the first electrode 110 and the second electrode 120 can operate in a DC constant current / constant voltage mode. When the first electrode 110 and the second electrode 120 operate in a DC constant current / constant voltage mode, it is preferable to disconnect the power for a period of time after operating for a period of time, so as to use water flow to flush and prevent the first perforation 112 and the second perforation 122 from being blocked by calcium and magnesium particle deposition.

[0058] According to an embodiment of the present invention, preferably, the operating mode of the first electrode 110 and the second electrode 120 can be a pulsed constant current / constant voltage mode. For example, the operating time can be set to 1 minute and the stop time to 30 minutes. However, the present invention does not limit the specific time of the operating time and the stop time.

[0059] If continuous operation is used, the voltage needs to be reduced to avoid over-electrolysis, which can lead to severe calcium and magnesium deposition at the cathode during the electrochemical reaction, resulting in decreased current efficiency and increased cell voltage. This not only increases power consumption but also damages the expensive anode, causing significant economic losses.

[0060] According to embodiments of the present invention, the pulsed constant current / constant pressure mode effectively inhibits biofouling during operation and prevents blockage of the first perforation 112 and the second perforation 122 through the flushing action of water flow during shutdown. Therefore, according to the present invention, by using the pulsed constant current / constant pressure mode and intermittent electrolysis, biofouling can be effectively prevented, energy can be saved, calcium and magnesium ion deposition can be avoided, and the service life of the equipment can be extended.

[0061] Therefore, by rationally designing the operating modes of the first electrode 110 and the second electrode 120, and combining constant potential control and pulse constant current / constant voltage modes, this invention effectively achieves the goal of preventing marine organism attachment. Furthermore, in a natural seawater environment, the front-end filter 100 of this invention ensures the self-cleaning and anti-fouling effect of the electrode surface by maintaining continuous seawater scouring, guaranteeing reliable system operation. Moreover, the voltage can be adjusted according to actual needs to achieve optimal anti-fouling effect and energy efficiency.

[0062] Seawater cooling system According to embodiments of the present invention, a seawater cooling system including the aforementioned front-end filter 100 can also be provided. A pipe 200 of the seawater cooling system can be connected to the upper end of the front-end filter 100. For example, as described above, the flange 210 of the pipe 200 can be connected to the first insulating pad 310 to mate the front-end filter 100 with the pipe 200. However, the manner in which the front-end filter 100 is mated to the pipe 200 is not limited thereto and can be specifically configured according to the structure of the pipe 200.

[0063] Wind turbine generator set According to embodiments of the present invention, a wind turbine generator set including the seawater cooling system described above can also be provided. The wind turbine generator set according to embodiments of the present invention can be an offshore wind turbine generator set.

[0064] The front-end filter according to embodiments of the present invention can achieve beneficial technical effects, not limited to those described below.

[0065] This invention, by setting up a front-end filter including a first electrode and a second electrode, can prevent marine organisms from attaching to the electrode filter screen through electrolysis technology, thereby ensuring the normal operation of the seawater cooling system.

[0066] The anode of this invention is a titanium composite electrode (DSA anode) with a ruthenium-iridium alloy coating that has good electrolytic chlorine evolution activity in seawater, and the cathode is a Monel nickel alloy cathode with good seawater corrosion resistance. This ensures the corrosion resistance and electrolysis efficiency of the filter screen in the seawater environment, thereby improving the stability and service life of the system.

[0067] This invention improves the filtration effect by setting the front-end filter as a two-layer cylindrical structure, and at the same time, cooling water can enter the pipe through the side wall and bottom wall, thus increasing the cooling water inlet speed.

[0068] This invention, by using a pulsed electrolysis operating mode, can effectively control electrode failure caused by cathode calcium and magnesium deposition, and greatly extend electrode life.

[0069] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention; the objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A front-end filter for a seawater cooling system, characterized in that, The front-end filter (100) includes: The first electrode (110) includes a first electrode substrate (111) and a plurality of first perforations (112) passing through the first electrode substrate (111). The second electrode (120) is spaced at a predetermined distance from the first electrode (110) and includes a second electrode substrate (121) and a plurality of second perforations (122) passing through the second electrode substrate (121). One of the first electrode (110) and the second electrode (120) includes a titanium substrate with a ruthenium-iridium alloy coating, and the other of the first electrode (110) and the second electrode (120) includes a nickel alloy. Seawater for the seawater cooling system enters the pipe (200) of the seawater cooling system after passing through the first perforation (112) and the second perforation (122).

2. The front-end filter of the seawater cooling system according to claim 1, characterized in that, The first electrode substrate (111) forms an outer cylinder, and the second electrode substrate (121) forms an inner cylinder. The second electrode substrate (121) is disposed inside the first electrode substrate (111) and is electrically isolated from the first electrode substrate (111).

3. The front-end filter of the seawater cooling system according to claim 2, characterized in that, The first electrode substrate (111) has an open end (113) connected to a first electrode terminal (110A), and the second electrode substrate (121) has an open end (123) connected to a second electrode terminal (110B).

4. The front-end filter of the seawater cooling system according to claim 2, characterized in that, The front-end filter (100) also includes a plurality of insulating support rods (130), one end of which is fixed to the first electrode substrate (111) and the other end of which is fixed to the second electrode substrate (121) so that the first electrode substrate (111) and the second electrode substrate (121) are insulated from each other.

5. The front-end filter of the seawater cooling system according to claim 2, characterized in that, The first electrode substrate (111) includes an outer sidewall (111a) and an outer bottom wall (111b), and the second electrode substrate (121) includes an inner sidewall (121a) and an inner bottom wall (121b). The distance between the outer sidewall (111a) and the inner sidewall (121a) is equal to the distance between the outer bottom wall (111b) and the inner bottom wall (121b).

6. The front-end filter of the seawater cooling system according to claim 3, characterized in that, Along the axial direction of the front-end filter (100), the diameter of the first electrode substrate (111) gradually increases from the end opposite to the opening end (113) of the first electrode substrate (111) to the opening end (113) of the first electrode substrate (111), and the diameter of the second electrode substrate (121) gradually increases from the end opposite to the opening end (123) of the second electrode substrate (121) to the opening end (123) of the second electrode substrate (121).

7. The front-end filter of the seawater cooling system according to any one of claims 1 to 6, characterized in that, The first electrode (110) and the second electrode (120) operate in either DC constant current / constant voltage mode or pulse constant current / constant voltage mode.

8. The front-end filter of the seawater cooling system according to claim 3, characterized in that, The first electrode (110) further includes a first flange (114) disposed at the upper end of the first electrode (110), and the second electrode (120) further includes a second flange (124) disposed at the upper end of the second electrode (120). The first electrode terminal piece (110A) is connected to the first flange (114), and the second electrode terminal piece (110B) is connected to the second flange (124).

9. A seawater cooling system, characterized in that, The seawater cooling system includes a front-end filter (100) according to any one of claims 1 to 8.

10. A wind turbine generator set, characterized in that, The wind turbine generator set includes the seawater cooling system according to claim 9.

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