Distributed solar-driven metal cathode protection system

Abstract

The invention discloses a distributed solar-driven metal cathode protection system, and belongs to the field of cathode protection of impressed current. Comprising a solar panel, an anti-corrosion control box and an external module, wherein the anti-corrosion control box is used for fixing, isolating and protecting damageable parts; electric energy generated by the solar panel is converted and controlled by vulnerable parts of the anti-corrosion control box and then is provided for an external module. According to the invention, the surface potential of the metal can be reduced to a corrosion immune zone by utilizing sunlight irradiation without an external power supply, so that the purpose of cathode protection is achieved, and the system almost has no operation cost, is independent of power supply of a power grid, and is particularly suitable for cathode protection of independent metal facilities in remote areas.

Description

Technical Field

[0001] The present invention relates to the technical field of impressed current cathode protection, and more particularly to a distributed solar-driven metal cathode protection system. Background Art

[0002] Impressed current cathodic protection technology is currently a commonly used electrochemical corrosion protection technology for metal corrosion protection. This anti-corrosion technology usually uses a constant potential instrument to convert the alternating current supplied by the power grid into low-voltage direct current, connects the negative electrode to the protected metal through a wire, and connects the positive electrode to the auxiliary anode. Through cathodic polarization, the corrosion of the metal is inhibited.

[0003] Objective disadvantages of existing technology:

[0004] (1) The existing impressed current cathodic protection system requires continuous power supply from the power grid. In remote areas, island environments and other areas where the power grid is not covered, the impressed current cathodic protection system is difficult to implement.

[0005] (2) The existing impressed current cathodic protection technology requires continuous consumption of electrical energy during use, resulting in high operating costs.

[0006] (3) The existing impressed current cathodic protection technology has high equipment cost and difficult construction, and is mainly used for corrosion protection of large metal facilities.

[0007] (4) The current device is difficult to promote in reality because it consists of many components, is fragile, and is difficult to adapt to harsh corrosive environments.

[0008] Therefore, how to provide a distributed solar-driven metal cathode protection system that can solve the above problems is an issue that technical personnel in this field urgently need to solve. Summary of the invention

[0009] In view of this, the present invention provides a distributed solar-driven metal cathode protection system to solve the technical problems existing in the above-mentioned prior art.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A distributed solar-driven metal cathodic protection system, comprising:

[0012] Solar panels, corrosion-resistant control boxes and external modules;

[0013] Wherein, the anti-corrosion control box fixes and isolates the vulnerable parts for protection;

[0014] The electric energy generated by the solar panel is converted and controlled by vulnerable parts of the corrosion-resistant control box and then provided to the external modules.

[0015] Furthermore, the anti-corrosion control box comprises:

[0016] Solar controller, battery, voltage detection device, voltage controller and DC transformer;

[0017] Wherein, the solar controller is connected with the solar panel, the battery and the DC transformer;

[0018] The storage battery is connected to the solar controller and the voltage controller;

[0019] The voltage controller is connected to the DC transformer and the voltage detection device;

[0020] The voltage detection device is connected to the external module.

[0021] Furthermore, the outlet port of the anti-corrosion control box is sealed with rubber and paint.

[0022] Furthermore, the external module includes:

[0023] Counter electrode, reference electrode and protected metal in corrosive environment;

[0024] The voltage between the reference electrode and the protected metal is used as the basis for adjusting the DC transformer to reduce the surface potential of the protected metal to the corrosion immunity potential.

[0025] Furthermore, the counter electrode is connected to the positive electrode of the DC transformer by an insulating and protected wire, one end of the protected metal is connected to the negative electrode of the DC transformer by an insulating and protected wire, the other end of the protected metal is connected to one end of the voltage detection device by an insulating and protected wire, and the other end of the voltage detection device is connected to the reference electrode by an insulating and protected wire.

[0026] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a distributed solar-driven metal cathodic protection system, which splits and integrates the solar cathodic protection system, integrates and protects all vulnerable parts including solar controllers, batteries, voltage detection devices, voltage controllers and DC transformers, thereby improving the stability of the solar cathodic protection device and extending its service life; while using an anti-corrosion control box to protect vulnerable parts, the interface is sealed with rubber and paint at the lead-out port, and the anti-corrosion control box is placed away from corrosive environments such as seawater and soil, and is connected to the protected metal, the counter electrode and the reference electrode with insulated protective wires to reduce the corrosion effect of the corrosive environment on the vulnerable parts and extend their service life; the voltage between the reference electrode and the protected device is used as the adjustment basis of the DC voltage regulator to reduce the surface potential of the protected metal to the corrosion immunity potential; the protection potential is adjusted according to the on-site corrosion environment and the type of metal, so as to achieve the effect of efficient protection of various metals and corrosive environments; the solar panels and batteries of appropriate sizes are matched according to the surface area of ​​the protected metal and the corrosion environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0030] Embodiment 1:

[0031] See also Figure 1 The embodiment of the present invention discloses a distributed solar-driven metal cathode protection system, comprising:

[0032] Solar panels, corrosion-resistant control boxes and external modules;

[0033] Among them, the anti-corrosion control box fixes and isolates the vulnerable parts for protection;

[0034] The electricity generated by the solar panels is converted and controlled by the vulnerable parts of the corrosion-resistant control box and then provided to the external modules.

[0035] In a specific embodiment, the corrosion-resistant control box comprises:

[0036] Solar controller, battery, voltage detection device, voltage controller and DC transformer;

[0037] Wherein, the solar controller is connected with the solar panel, the battery and the DC transformer;

[0038] The battery is connected to the solar controller and the voltage controller;

[0039] The voltage controller is connected with the DC transformer and the voltage detection device;

[0040] The voltage detection device is connected to the external module.

[0041] In a specific embodiment, rubber and paint are used to seal the outlet port of the corrosion-resistant control box.

[0042] In a specific embodiment, the external module includes:

[0043] Counter electrode, reference electrode and protected metal in corrosive environment;

[0044] Among them, the voltage between the reference electrode and the protected metal is used as the adjustment basis of the DC transformer to reduce the surface potential of the protected metal to the corrosion immunity potential.

[0045] In a specific embodiment, the counter electrode is connected to the positive pole of the DC transformer with an insulated protective wire, one end of the protected metal is connected to the negative pole of the DC transformer with an insulated protective wire, the other end of the protected metal is connected to one end of the voltage detection device with an insulated protective wire, and the other end of the voltage detection device is connected to the reference electrode with an insulated protective wire.

[0046] Specifically, this embodiment disassembles and integrates the solar cathode protection system, integrates and protects all vulnerable parts including the solar controller, battery, voltage detection device, voltage controller and DC transformer (solar controller, battery, voltmeter, voltage controller, DC voltage regulator), improves the stability of the solar cathode protection device, and extends its operating life.

[0047] Specifically, in this embodiment, while using an anti-corrosion control box (cathode protection box) to protect vulnerable parts, the interface is sealed with rubber and paint at the lead-out port, and the anti-corrosion control box (cathode protection box) is placed away from corrosive environments such as seawater and soil, and is connected to the protected metal, counter electrode and reference electrode with insulated wires, thereby reducing the corrosion effect of the corrosive environment on vulnerable parts and extending their service life.

[0048] Specifically, this embodiment uses the voltage between the reference electrode and the protected device as the adjustment basis of the DC voltage regulating device to reduce the surface potential of the protected metal to the corrosion immunity potential. Implementation method: The voltage difference between the protected metal and the reference electrode detected by the voltmeter is transmitted to the voltage controller, and the voltage controller automatically compares the detected value with the set value, increases or decreases the output voltage, and adjusts the surface potential of the protected metal to within the set range, thereby achieving the purpose of cathodic protection.

[0049] Specifically, this embodiment adjusts the protection potential according to the on-site corrosion environment and metal type, thereby achieving the effect of highly efficient protection for various metals and corrosion environments. Implementation method: The corrosion potential can be determined according to the type of metal, and the control range of the metal cathode protection surface potential can be set according to the corrosion environment classification. During the automatic control process, according to the real-time potential detection results, the voltage controller can adjust the output voltage so that the metal surface potential is stable within the set range, thereby achieving the effect of cathodic protection.

[0050] Specifically, this embodiment matches solar panels and batteries of appropriate sizes according to the surface area of ​​the protected metal and the corrosive environment. Implementation method: The amount of electricity consumed by metal cathodic protection is related to the metal structure, surface coating, corrosive environment, set protection potential, and the type and area of ​​the auxiliary anode. Under stable operation conditions, the power consumed by the cathodic protection can be estimated. With the changes in site conditions and the structure of metal devices, the consumed electric energy will have obvious differences. The electric energy consumed by the metal cathodic protection and the time when the photoelectric conversion cannot be effectively performed to charge the battery under the extreme conditions of local sunlight are estimated, so as to equip the battery capacity of the battery that can ensure the stable operation of the equipment within this time, and the size of the solar panel that can continuously supply electric energy (the power supply capacity of the solar panel is determined according to the photoelectric conversion efficiency, area size, light intensity and light duration), and a certain redundancy is considered, so as to determine the size of the required battery and the size of the solar panel.

[0051] Embodiment 2:

[0052] In 3.5w% NaCl simulated seawater, sample: Q235 (surface area 36 square centimeters), using a distributed solar-driven metal cathode protection system provided by the present invention, the cathode is connected to the sample with a wire, and under sunlight, the distributed solar-driven metal cathode protection system provided by the present invention can be continuously and stably operated for more than 3 months without external power supply. According to the DC transformer setting value, the surface potential of the Q235 sample can be freely adjusted between -0.85v (SCE) and -1.15v (SCE) as the setting value changes. Under the cathode protection with a setting voltage of 0.9V, in the simulated seawater continuously stirred by an aerator, the Q235 sample has a good appearance for 3 days, no obvious corrosion phenomenon, and the weight remains at 116g, with almost no change. In contrast, the same sample without cathode protection has obvious corrosion on the surface after 3 days, and the weight decreases by 0.11g after 3 days, which is about 0.095% of the original weight. The cathode protection effect of the system can be shown by comparison.

[0053] The present invention provides a distributed solar-driven metal cathodic protection system, which is a new metal cathodic protection system that can reduce the metal surface potential to a corrosion-immune zone by using sunlight without an external power supply, thereby achieving the purpose of cathodic protection. The system has almost no operating cost and does not rely on power grid power. It is particularly suitable for cathodic protection of independent metal facilities in remote areas.

[0054] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0055] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A distributed solar-driven metal cathodic protection system, characterized in that: include: Solar panels, corrosion-resistant control boxes and external modules; Wherein, the anti-corrosion control box fixes and isolates the vulnerable parts for protection; The electric energy generated by the solar panel is converted and controlled by vulnerable parts of the corrosion-resistant control box and then provided to the external modules.

2. A distributed solar-driven metal cathodic protection system according to claim 1, characterized in that: The anti-corrosion control box comprises: Solar controller, battery, voltage detection device, voltage controller and DC transformer; Wherein, the solar controller is connected with the solar panel, the battery and the DC transformer; The storage battery is connected to the solar controller and the voltage controller; The voltage controller is connected to the DC transformer and the voltage detection device; The voltage detection device is connected to the external module.

3. A distributed solar-driven metal cathodic protection system according to claim 2, characterized in that: The outlet port of the anti-corrosion control box is sealed with rubber and paint.

4. A distributed solar-driven metal cathodic protection system according to claim 2, characterized in that: The external module comprises: Counter electrode, reference electrode and protected metal in corrosive environment; The voltage between the reference electrode and the protected metal is used as the basis for adjusting the DC transformer to reduce the surface potential of the protected metal to the corrosion immunity potential.

5. A distributed solar-driven metal cathodic protection system according to claim 4, characterized in that: The counter electrode is connected to the positive electrode of the DC transformer by an insulating and protected wire, one end of the protected metal is connected to the negative electrode of the DC transformer by an insulating and protected wire, the other end of the protected metal is connected to one end of the voltage detection device by an insulating and protected wire, and the other end of the voltage detection device is connected to the reference electrode by an insulating and protected wire.

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