Anticorrosion and sterilization device and process for seawater cooling pipeline of high-power frequency converter

Abstract

The present invention discloses an anti-corrosion and sterilization device and process for seawater cooling pipelines of high-power frequency converters. The device includes metal pipe fittings for cooling seawater circulation, graphene electrodes and an external power supply. The metal pipe fittings, graphene electrodes and external power supply are electrically connected, and the metal pipe fittings are negative electrodes and the graphene electrodes are positive electrodes, thereby forming a current path to electrolyze the cooling seawater of the pipe fittings to produce NaClO, HClO and chlorine, thereby preventing the growth and accumulation of microorganisms such as bacteria and algae in the pipe, keeping the inner wall clean, and ensuring the heat exchange effect. In addition, the metal pipe fittings are white copper pipes with titanium-plated inner surfaces, which have strong seawater corrosion resistance, ensure the corrosion resistance of the cooling pipe, and effectively ensure the stable operation of the system. Moreover, the present invention uses seawater as a cooling medium without considering the cost; the titanium-plated white copper pipe acts as a heat-conducting medium and can also be used as a cathode for chemical sterilization and sterilization, which greatly simplifies equipment investment, reduces floor space, and has good practical and economic value.

Description

Technical Field

[0001] The invention relates to an anti-corrosion and sterilization device and process for seawater cooling pipelines of high-power frequency converters. Background Art

[0002] With more and more human activities related to the ocean, more and more ships are using efficient all-electric propulsion technology. Among them, the inverter module is a high-power device, which will dissipate a lot of heat energy in a short time. If it cannot be dissipated in time, it will cause the control system to reduce the operating power, directly affect the ship speed, and even shut down or burn out due to thermal runaway. Therefore, it is necessary to equip the self-equipped high-efficiency heat dissipation device to dissipate the heat energy into the environment in time. In the ocean, the cheapest and most effective medium is seawater, but using seawater will cause two problems: 1) The high salt content of seawater corrodes metal pipes, causing perforation and leakage; 2) Microorganisms grow on the pipe wall, affecting the heat exchange effect. There are many ways to solve these two problems, such as inner surface coating treatment and sacrificial anode protection, but it is difficult to achieve long-term stability at the same time, and the equipment needs to be replaced frequently, which increases the cost. Therefore, there is an urgent need for a solution that can provide long-term protection and heat dissipation using seawater to effectively protect the cooling pipes and extend the replacement time, such as replacing equipment for more than one year. Summary of the invention

[0003] In order to solve the above problems and achieve the above objectives, the present invention provides an anti-corrosion and sterilization device and process for seawater cooling pipelines of high-power frequency converters, which uses a titanium-plated copper-white tube as a cathode electrode and an externally connected graphite anode electrode to electrolyze seawater to kill microorganisms while preventing corrosion of pipe fittings. The specific technical solution is as follows:

[0004] First, the present invention provides an anti-corrosion and sterilization device for seawater cooling pipelines of high-power frequency converters. The device includes metal pipes for cooling seawater circulation, graphene electrodes and an external power supply. The metal pipes, graphene electrodes and the external power supply are electrically connected, and the metal pipes are negative poles and the graphene electrodes are positive poles.

[0005] Preferably, the external power supply is a direct current power supply; and the metal pipes used for cooling the seawater circulation are white copper pipes.

[0006] Further preferably, the inner surface of the white copper tube is provided with a titanium coating;

[0007] Still more preferably, the thickness of the titanium coating is 5 to 15 μm;

[0008] Most preferably, the titanium coating layer has a thickness of 12 to 15 μm.

[0009] The aforementioned device is used for the anti-corrosion and sterilization process of the seawater cooling pipeline of the high-power frequency converter: the titanium-plated nickel silver pipe fittings, the graphene electrode and the external DC power supply are connected by wires, the nickel silver pipe is used as the negative electrode, and the graphene electrode is used as the positive electrode to form a current path, and the cooling seawater flowing through the nickel silver pipe is electrolyzed to produce NaClO, HClO and chlorine gas to prevent the growth and accumulation of microorganisms such as bacteria and algae in the pipe.

[0010] As a preferred technical solution, the electrolysis treatment is an intermittent operation mode, and the intermittent time is once every 5 to 20 days.

[0011] As a preferred technical solution, the duration of each electrolytic treatment is controlled within 5 to 20 minutes.

[0012] As a preferred technical solution, the thickness of the titanium coating inside the white copper tube is 5 to 15 μm;

[0013] As a preferred technical solution, the current of the DC power supply is controlled to be 10-50 mA / cm 2 .

[0014] The beneficial effects of the present invention are:

[0015] The present invention uses a white copper tube with titanium coating on the inner surface as a cathode electrode, and an external graphite anode electrode to directly electrolyze seawater to produce NaClO, HClO and chlorine, thereby preventing algae from accumulating on the inner wall, keeping the inner wall clean, and ensuring the heat exchange effect. Moreover, the white copper tube with titanium coating of the present invention has a strong ability to resist seawater corrosion; the white copper tube with titanium coating not only acts as a heat conducting medium, but also can be used as a cathode for chemical sterilization and sterilization; the present invention uses intermittent electrolysis of seawater to produce chlorine for sterilization, and since it is used in an all-electric propulsion system, the source of DC power is not a problem; the present invention uses direct seawater cooling to fan the inverter module, and the cost of the cooling medium does not need to be considered when driving in the ocean.

[0016] Therefore, the structure and process of the present invention not only ensure the corrosion resistance of the cooling pipe, but also completely prevent the attachment of microorganisms, effectively ensuring the stable operation of the system; and it maximizes the use of available resources on site, greatly simplifies equipment investment, reduces floor space, and frees up more space for other equipment, thus having good practical and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the structure of the anti-corrosion and sterilization device for the seawater cooling pipeline of a high-power frequency converter according to the present invention.

[0018] In the figure: 1. Metal pipes; 2. Graphene electrodes; 3. External power supply; 4. Titanium coating; 5. Cooling seawater. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the embodiments and drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The specific embodiments are as follows:

[0020] Anti-corrosion and sterilization device for seawater cooling pipelines of high-power inverters, such as Figure 1 As shown, it includes a metal pipe 1 for circulating cooling seawater 5, a graphene electrode 2 and an external power supply 3. The metal pipe 1, the graphene electrode 2 and the external power supply 3 are electrically connected, and the metal pipe 1 is the negative electrode and the graphene electrode 2 is the positive electrode, thereby forming a current path to electrolyze the cooling seawater in the pipe to produce NaClO, HClO and chlorine, thereby preventing the growth and accumulation of microorganisms such as bacteria and algae in the pipe, keeping the inner wall clean, and ensuring the heat exchange effect.

[0021] In this embodiment, the external power supply 3 is a DC power supply; the metal pipe 1 for cooling the circulation of seawater 5 is a nickel silver pipe, and a titanium coating 4 is provided on its inner surface, and the thickness of the titanium coating 4 is 5 to 15 μm; preferably 12 to 15 μm. The titanium-plated nickel silver pipe has a strong ability to resist seawater corrosion, which solves the problem of high seawater salinity corroding metal pipes and causing perforation and leakage. In addition, the titanium-plated nickel silver pipe acts as a heat conducting medium and a cathode for chemical sterilization, simplifying the device structure.

[0022] The anti-corrosion and sterilization device for the seawater cooling pipeline of a high-power frequency converter described in this embodiment has the following process for anti-corrosion and sterilization: the titanium-plated nickel silver pipe fittings, the graphene electrode and the external DC power supply are connected by wires, the nickel silver pipe is used as the negative electrode, the graphene electrode is used as the positive electrode, and a current path is formed to electrolyze the cooling seawater flowing through the nickel silver pipe to produce NaClO, HClO and chlorine gas to prevent the growth and accumulation of microorganisms such as bacteria and algae in the pipe. The electrolysis treatment is an intermittent operation mode, and the intermittent time is once every 5 to 20 days. The time of each treatment is controlled at 5 to 20 minutes, and the current is controlled at 10 to 50 mA / cm 2 , and it is run once every 5-20 days with the daily maintenance of the hull to ensure the normal operation of the equipment. Since the aforementioned device in this embodiment is used for an all-electric propulsion system, the source of DC power is not a problem, and the inverter module is fanned by seawater direct cooling, and the cost of the cooling medium does not need to be considered when traveling in the ocean. Therefore, the structure and process of the present invention not only ensure the corrosion resistance of the cooling pipe, but also completely prevent the attachment of microorganisms, effectively ensuring the stable operation of the system; and it maximizes the use of available resources on site, greatly simplifies equipment investment, reduces floor space, and frees up more space for other equipment.

[0023] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0024] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1.Anti-corrosion and sterilization device for seawater cooling pipeline of high-power frequency converter, characterized by: It comprises a metal pipe (1) for circulating cooling seawater (5), a graphene electrode (2) and an external power supply (3), wherein the metal pipe (1), the graphene electrode (2) and the external power supply (3) are electrically connected, and the metal pipe (1) is a negative electrode and the graphene electrode (2) is a positive electrode; The metal pipe (1) used for the circulation of cooling seawater (5) is a white copper pipe; The inner surface of the white copper tube is provided with a titanium coating layer (4); The titanium coating layer (4) has a thickness of 12 to 15 μm; The external power supply (3) is a DC power supply; the current is controlled to be 10-50 mA / cm 2 ; The metal pipe (1) through which the cooling seawater (5) flows is used as a negative electrode, the external graphene electrode (2) is used as a positive electrode, and an external DC power supply is provided to form a current path, so as to electrolyze the cooling seawater (5) flowing through the nickel silver pipe to generate NaClO, HClO and chlorine gas, thereby preventing the growth of microorganisms in the metal pipe (1); The electrolysis treatment is an intermittent operation mode, and the intermittent time is once every 5 to 20 days; The duration of each electrolytic treatment is controlled within 5 to 20 minutes.

Images