WO2019061700A1

WO2019061700A1 - Seawater treatment system and seawater treatment control method

Info

Publication number: WO2019061700A1
Application number: PCT/CN2017/110038
Authority: WO
Inventors: 陈三定
Original assignee: 广船国际有限公司
Priority date: 2017-09-27
Filing date: 2017-11-08
Publication date: 2019-04-04
Also published as: CN107473328B; CN107473328A

Abstract

A seawater treatment system, comprising a sea chest valve box (1), a ballast water valve box (2), a ballast pump (3), an ultraviolet treatment device (5), a control device (4), a constant current output device (6), and a metal electrode (7). The ballast pump (3) is used for outputting an operation signal. The control device (4) is used for controlling, when receiving the operation signal, the ultraviolet treatment device (5) to be connected to an external power supply (9). The ultraviolet treatment device (5) is used for generating ultraviolet to kill marine organisms. The control device (4) is further used for cutting a connection between the ultraviolet treatment device (5) and the external power supply (9) when the operation signal is interrupted, and controlling the constant current output device (6) to be connected to the external power supply (9). The constant current output device (6) is used for outputting a current signal to the metal electrode (7). The metal electrode (7) is used for releasing metal ions to kill or expel the marine organisms. Also disclosed is a seawater treatment control method.

Description

Seawater treatment system and seawater treatment control method

Technical field

Embodiments of the present invention relate to the field of seawater treatment, and in particular, to a seawater treatment system and a seawater treatment control method.

Background technique

Ships sailing at sea are provided with ballast tanks. The ship needs to load a certain amount of ballast to ensure good stability and floatability during the voyage. According to the requirements of the operation, ships often need to press and discharge ballast water in the port waters or offshore waters. Therefore, in the process of ballast water, the plants contain low-level organisms such as phytoplankton, zooplankton, bacteria and pathogens. Biological debris, biological cysts, insoluble silicates, etc., often found in fish and sediments, enter the ballast tank. When the ship presses in and discharges the ballast water, the organisms in the ballast water will flow into the new living place and begin to multiply, which may lead to biological invasion and destruction of the local ecosystem. Not only that, marine organisms are attached to the ship's pipelines, causing blockages in seawater pipelines, valves, filters, various coolers, and subsea doors, resulting in reduced efficiency and power for seawater pumps, coolers, heat exchangers, etc. The increased fuel consumption of the unit and the reduced service life of the unit affect the working efficiency of the entire seawater system. In addition, the attachment of marine organisms on the inner surface of the ship's pipeline will also cause the formation of oxygen-concentrated batteries on the metal surface, which will accelerate the local corrosion and quickly cause pitting perforation. Therefore, seawater entering the ship's pipelines and ballast tanks must be treated by sea creatures.

At present, ballast water systems generally use two basic processes to treat ballast water: the physical separation process, that is, the separation of microorganisms with a size larger than 50um and a partial size of 10 to 50um in ballast water by physical means such as filtration, spinning, and flocculation. Come out to achieve the separation of aquatic organisms and large-scale microorganisms; The process is specifically divided into physical and chemical methods. The physical method refers to the use of ultraviolet, deoxidation, gas injection, ultrasonic cavitation and other methods to kill microorganisms; chemical method refers to the production of chlorinated fire extinguishing, ozone fire extinguishing or hydroxyl radicals by electrolysis of seawater. Strong oxidants kill microorganisms.

Existing equipment requires both ballast water treatment systems and anti-marine organisms to achieve the function of killing marine organisms and preventing marine organisms from entering seawater pipelines. In order to prevent marine organisms from entering the pipelines and ballast tanks of ships, the ships at this stage are equipped with fully independent, cooperating ballast water treatment systems and marine biological systems, but at the same time as ballast water treatment systems and marine biological systems. The use of the seawater entering the cabin is multi-processed, shortening the service life of the electrode rods of the anti-sea biological device, and the ballast water treatment system and the anti-marine biological system also interfere with each other, affecting the use efficiency. This caused a waste of resources on board.

Summary of the invention

The embodiment of the invention provides a seawater treatment system and a seawater treatment control method, which can kill marine life, and can also save the cost of shipbuilding and the space for ship installation equipment.

In order to achieve the above objective, the embodiment of the present invention adopts the following technical solutions:

In a first aspect, an embodiment of the present invention provides a seawater treatment system including a subsea valve box, a ballast water valve box, a ballast pump, an ultraviolet treatment device, a control device, a constant current output device, and a metal electrode;

The ballast pump is connected to the ballast water valve box through a pipeline for injecting seawater into the ballast water valve box when an external power source is turned on, and outputting an operation signal;

The control device is electrically connected to the ballast pump for controlling the ultraviolet processing device to turn on an external power source when receiving the operation signal;

The ultraviolet treatment device is connected to the control device, and is disposed at the ballast pump and the ballast Between the water valve boxes, for generating ultraviolet rays when the external power source is turned on to kill marine life;

The control device is connected to the constant current output device, and is further configured to cut off the connection between the ultraviolet processing device and an external power source when the operation signal is interrupted, and control the constant current output device to turn on an external power source;

The constant current output device is disposed between the ballast pump and the subsea valve box for outputting a current signal to the metal electrode when the external power source is turned on;

The metal electrode is disposed in the subsea valve box, and is connected to the constant current output device for releasing metal ions according to the received current signal to kill or drive marine life in the submarine valve box;

The subsea valve box and the ballast water valve box are connected by a pipeline for injecting seawater into the ballast water valve box when the ballast pump does not output an operation signal;

The ballast water valve box is used to treat seawater and inject seawater into the ballast tank and the nacelle.

In a second aspect, an embodiment of the present invention provides a seawater processing control method, where the method includes:

Receiving an operation signal of the output of the ballast pump, controlling the ultraviolet processing device to turn on an external power source, so that the ultraviolet processing device generates ultraviolet rays to kill marine life;

When detecting that the operation signal is interrupted, disconnecting the ultraviolet processing device from an external power source, and controlling the constant current output device to turn on an external power source to cause the constant current output device to output a current signal to the metal electrode to release the metal ion to kill Or drive away marine life in the submarine valve box.

According to the technical solution provided by the embodiments of the present invention, when the ship is under ballast, the ultraviolet processing device outputs a large dose of ultraviolet rays to kill marine organisms, and when the ship is not ballasted, the constant current output device outputs a constant small current electrolytic metal electrode to kill Or drive away marine life. The technical solution provided by the embodiment of the present invention replaces the existing two systems of ballast water treatment system and marine biological system, and achieves killing and While driving away marine life, it also saves the cost of shipbuilding and saves the space required to install ballast water treatment equipment.

DRAWINGS

Figure 1 is a schematic diagram of a prior art ballast water treatment system;

2 is a schematic diagram of a prior art anti-marine biological system;

3 is a schematic diagram showing the working principle of a seawater treatment system according to Embodiment 1 of the present invention;

4 is a schematic diagram showing the working principle of a seawater treatment system according to Embodiment 2 of the present invention;

5 is another working principle diagram of a seawater treatment system according to Embodiment 2 of the present invention;

FIG. 6 is a flowchart of a seawater processing control method according to Embodiment 3 of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should also be noted that, for ease of description, only some, but not all, of the structures related to the present invention are shown in the drawings.

Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as a process or method depicted as a flowchart. Although the flowcharts describe the various steps as a sequential process, many of the steps can be implemented in parallel, concurrently, or concurrently. In addition, the order of the steps can be rearranged. The process may be terminated when its operation is completed, but may also have additional steps not included in the figures. The processing may correspond to methods, functions, procedures, subroutines, subroutines, and the like.

In the existing ship ballast water treatment equipment, both the ballast water treatment system and the anti-marine organisms need to work simultaneously to achieve the function of killing marine organisms and preventing marine organisms from entering the seawater pipelines. 1 is a schematic diagram of a prior art ballast water treatment system, and FIG. 2 is a schematic diagram of a prior art anti-marine biological system. As shown in Fig. 1, the ballast water treatment system is mainly composed of a ballast water treatment electric control box 101, a seawater transmission pipe 104 and a ballast water valve box 103 containing a large number of ballast water treatment lines 102, and the specific working process is as follows: When the ship needs to be ballasted in the seawater area, the ballast water treatment system is turned on, and the large amount of ballast water treatment line 102 in the ballast water treatment electric control box 101 inputs a large current of several hundred amperes into the seawater, and the marine life is in it. Killing with a large current before entering the ballast water valve box 103. As shown in FIG. 2, the anti-marine biological system is mainly composed of a junction box 201, a first metal electrode 202, a second metal electrode 203 and a subsea water valve box 204. The working process of the anti-marine biological system is: external power supply output AC, first After the alternating current is converted into direct current, the direct current is input to the first metal electrode 202 and the second metal electrode 203 provided in each of the subsea valve box 204 through the junction box 201, and the first metal electrode 202 and the second metal electrode 203 are both The positive electrode is connected to the anode of the output, and the hull is used as the negative electrode to connect with the cathode of the output, and after the electrode forms a circuit with the seawater, a current is formed around the subsea door to kill the marine organism, and the first metal electrode 202 and the second metal Electrode 203 is electrolyzed to kill marine life. Because the anti-marine biological system works in the process of ballasting, the water inflow is large, and there are many marine organisms entering with seawater. The output current can reach hundreds of amps to kill marine life. In order to prevent marine organisms from entering seawater pipelines and ballast tanks, the ship is equipped with an independent working ballast water treatment system and an anti-marine biological system. The ballast water treatment system and the marine biological system are used at the same time. After the water treatment electric control box is processed, the seawater treated by the seawater and the marine biological system enters the ballast water valve box and is output to the ballast tank. The existing ship ballast water treatment equipment performs multiple treatments on the seawater entering the cabin, shortening the service life of the electrode rods in the marine biological device, and using the large current to increase the power consumption of the ship. At the same time, the ballast water treatment system and the anti-marine biological system will also cause interference with each other, affecting the use efficiency and causing waste of resources on board.

Embodiment 1

3 is a working principle diagram of a seawater treatment system according to Embodiment 1 of the present invention. The seawater treatment system provided in this embodiment includes a subsea valve box 1, a ballast water valve box 2, a ballast pump 3, a control device 4, and an ultraviolet ray. The processing device 5, the constant current output device 6, and the metal electrode 7.

The ballast pump 3 is connected to the ballast water valve box 2 through a pipe 8 for injecting seawater into the ballast water valve box 2 when the external power source 9 is turned on, and outputs an operation signal.

The control device 4 is electrically connected to the ballast pump 3 for controlling the ultraviolet processing device 5 to turn on the external power source 9 when receiving the operation signal; the ultraviolet processing device 5 is connected to the control device 4, and is disposed in the ballast pump 3 and the ballast water. Between the valve box 2, it is used to generate ultraviolet rays to kill marine organisms when the external power source 9 is turned on; the ultraviolet processing device 5 is equipped with an ultraviolet light source and a large number of ultraviolet rays, and enters the cabin when the ship is ballasted in the seawater region. The amount of sea water is large, there are many marine organisms, and the ultraviolet light is connected. A large number of ultraviolet light sources illuminate and emit ultraviolet light. The input seawater passes through the ultraviolet treatment device 5, and the ultraviolet light beam destroys the DNA of the living body to kill organisms smaller than 50um in size. The purpose of smaller plankton, bacteria and pathogens prevents their reproduction.

The control device 4 is connected to the constant current output device 6, and is also configured to cut off the connection between the ultraviolet processing device 5 and the external power source 9 when the operation signal is interrupted, and control the constant current output device 6 to turn on the external power source 9. The constant current output device 6 is disposed between the ballast pump 3 and the subsea valve box 1 for outputting a current signal to the metal electrode 7 when the external power source 9 is turned on. The output current signal is a constant small current signal below several amps. Preferably, the constant small current signal is 2A or less. When the ship When in different seawater regions, the resistivity of seawater is different, and the voltage of the constant current output device is adjusted so that the output current signal is constant.

When the constant current output device 6 outputs a constant current signal of 2 A or less, the metal electrode 7 is slowly electrolyzed in seawater, and a certain concentration of metal ions is released into the circulating seawater, causing an environment in which the marine life is difficult to survive in the entire seawater system. A certain concentration of metal ions can destroy proteins in marine biological cells and stop their lives, thereby killing and driving away marine life.

Specifically, the constant current output device 6 is equipped with a low-voltage low-current constant output line, the number of output channels is the same as the number of subsea doors, and a subsea door valve box 1 is disposed at each subsea door. The metal electrode 7 is disposed in the subsea valve box 1 and connected to the constant current output device 6 for releasing metal ions according to the received current signal to kill or drive the marine organisms in the submarine valve box; the material of the metal electrode can be It is made of copper, aluminum, iron, etc. The material of the selected metal electrode is determined according to the material of the ship pipe. Preferably, when the ship pipe is a steel pipe, the metal electrode may be copper and aluminum; when the ship pipe is a copper pipe, the metal electrode may be copper and iron. When the metal electrode is hydrolyzed, the metal electrode undergoes a redox reaction, releasing metal ions, causing an environment in which the marine life is difficult to survive in a submarine valve box, destroying proteins in marine biological cells, killing or driving away marine organisms, thereby achieving The purpose of antifouling.

Here, as shown in FIG. 3, the subsea valve box 1 and the ballast water valve box 2 are connected by a pipe 8 for injecting seawater into the ballast water valve box 2 when the ballast pump 3 does not output an operation signal. The ballast water valve box 2 is for treating seawater, and injecting seawater into the ballast tank 13 and the nacelle 14, respectively. The ultraviolet output device 5 for ballast water treatment is combined with a constant current output device 6 that outputs a constant small current and a metal electrode 7 to constitute a seawater treatment system.

Optionally, as shown in FIG. 3, a seawater treatment tank 10 is further included, and the ultraviolet treatment device 5 is disposed in the seawater treatment valve box 10, and the ballast pump 3 injects seawater into the ballast water valve box 2 through the seawater treatment valve box 10. .

The working process of the seawater treatment system in this embodiment is: when the ship is subjected to ballasting at the input seawater, the ballast pump 3 turns on the external power source 9, and outputs an operation signal to the control device 4, and the control device 4 receives the operation signal. The ultraviolet processing device 5 is controlled to turn on the external power source 9 and the ultraviolet output line, turn on the ultraviolet light source, emit a large dose of ultraviolet rays, and process a large amount of seawater entering the seawater treatment valve box 10. During the ballasting process of the ship, the seawater treatment system kills the marine life through the ultraviolet treatment device 5, and protects the ship pipeline. At this time, the connection line between the constant current output device 6 and the external power source 9 is cut off, and the constant current output device 6 is cut off. Not working. When the ship in the seawater area is not subjected to ballasting, the operation signal of the ballast pump 3 is interrupted, and after receiving the interrupt signal, the control device 4 turns on the external power source 9 of the constant current output device 6, and the constant current output device 6 operates. At this time, the connection line between the ultraviolet treatment device 5 and the external power source 9 is cut off, and the ultraviolet treatment device 5 does not operate. The constant current output device 6 outputs a current to the metal electrode 7 located in the subsea valve box 1 according to the actual situation, and the metal electrode 7 is electrolyzed in seawater to release metal ions, causing an environment in which the marine life is difficult to survive in the entire seawater system. A certain concentration of metal ions can destroy proteins in marine biological cells and stop their lives, thereby killing and driving away marine life. The seawater treated by the ultraviolet treatment device 5 and the seawater treated by the constant current output device 6 and the metal electrode 7 are respectively injected into the ballast water valve box 2 through the pipe 8, and the seawater entering the seawater treatment tank 2 is separately injected. In the ballast tank 13 and the nacelle 14.

The seawater treatment system provided by the invention is mainly composed of a UV treatment device and a constant current output device combined into a system, which replaces the two independent systems of the traditional ballast water treatment system and the anti-marine biological system, and the ballasting and non-ballasting in the ship. When the function is switched, the killing of marine organisms in the process of ballasting and non-ballasting of the ship is realized, which not only saves the cost of shipbuilding, but also saves space for installing ballast water treatment equipment.

Embodiment 2

4 is a working principle diagram of a seawater treatment system according to a second embodiment of the present invention. The seawater treatment system includes a subsea valve box 1, a ballast water valve box 2, a ballast pump 3, and a control device 4 in the first embodiment. The ultraviolet treatment device 5, the constant current output device 6, and the metal electrode 7, wherein the seawater treatment system further includes a potential detecting device 11 and a control device 4, and the potential detecting device 11 is disposed on the metal electrode 7 for detecting the seawater and the ship A potential difference signal between the outer casings is transmitted to the control device 4 by the detected potential difference signal. When the ship is in the freshwater area, the salt content in the water becomes less and the electrical resistivity increases. At this time, the potential difference between the seawater and the ship's outer shell is large. At this time, the seawater is fresh water with low salt content; when the ship is in the seawater area The salt content in the water increases, the electrical resistivity decreases, and the potential difference between the seawater and the hull is small. The metal electrode 7 can be divided into a first metal electrode and a second metal electrode. When the first metal electrode is a copper electrode, the second metal electrode can be an aluminum electrode. The copper electrode generates copper ions during the electrolysis process, and the copper ions are Toxic, so as to achieve the role of killing marine organisms; aluminum electrode in the electrolysis process produces oxide floc attached to the pipe wall to form a protective film, which can effectively protect the pipe wall from corrosion, thereby achieving anti-corrosion effect . The choice of electrode material is related to the material used in the pipeline. When the materials used in the pipeline are different, the preferred electrode materials are different. For example, when the pipeline material is copper, an iron electrode should be used instead of the aluminum electrode.

The control device 4 is electrically connected to the potential detecting device 11 for receiving the potential difference signal, and when the received potential difference signal is less than the set value, indicating that the ship is in the seawater region, the control device 4 controls the constant current output device 6 to The metal electrode 7 outputs a current signal; when the received potential difference signal is greater than the set value, indicating that the ship is in the fresh water region, the control device 4 controls the constant current output device 6 to be turned off. Preferably, the set value may be 500 mV, which differs depending on the seawater content. Such as If the potential difference exceeds 500mV, the salt content of seawater is very low, the ship is in the fresh water area, and the constant current output device does not output current. If the potential difference is less than 500mV, the ship is in the seawater area, and the constant current output device works. A constant small current is output to kill or drive away sea creatures. Preferably, the constant small current can be 2A or less.

As shown in FIG. 4, the working process between the constant current output device 6, the metal electrode 7, the potential detecting device 11, and the control device 4 is specifically: in the electrolysis process of the metal electrode 7, the hull is used as the cathode, and the electrode 7 is used as the electrode 7 anode. When the ship is not subjected to ballasting, the ballast pump 3 does not operate, and the constant current output device 6 turns on the external power source 9, and whether or not the output current signal is required depends on the potential difference between the water detected by the potential detecting device 11 and the ship's outer casing. When the potential difference signal detected by the potential detecting device 11 is smaller than the set value, the ship is in the seawater region. At this time, the control device 4 controls the constant current output device 6 to output a current to the metal electrode 7, and the metal electrode 7 starts to undergo hydrolysis. When the potential difference signal detected by the potential detecting device 11 is greater than the set value, the ship is in the fresh water region. At this time, the control device controls the constant current output device not to output current to the metal electrode 7, and the electrode does not undergo hydrolysis. Among them, the set value is calculated according to the seawater content at that time, and can be 500mV.

FIG. 5 is a schematic diagram of another working principle of a seawater treatment system according to an embodiment of the present invention. When the ship performs ballasting, the operation signal is output, and the control device 4 controls the ultraviolet processing device 5 disposed in the seawater processing valve box 10 to turn on the external power source 9, and the ultraviolet processing device 5 emits a high-intensity ultraviolet light beam to kill the marine life. At this time, the external circuit of the constant current output device 6 is cut off; when the ship is not subjected to ballasting, the output operation signal is interrupted, and the control device 4 controls the constant current output device 6 to turn on the external power source 9, and the external circuit of the ultraviolet processing device 5 at this time Cut off. The constant current output device 6 is respectively connected to the first metal electrode 7-1 and the second metal electrode 7-2 provided in the subsea valve box 1, and whether the constant current output device 6 is directed to the first metal electrode 7-1 and the second metal The output current of the electrode 7-2 also depends on the setting of the metal The potential difference between the water detected by the potential detecting device 11 on the pole 7 and the ship's outer casing. When the potential detecting means 11 detects that the potential difference is smaller than the set value, the constant current output means 6 outputs a constant small current. The potential difference of the set value may be 500 mV, and the value of the constant small current may be 2 A. At this time, the first metal electrode 7-1 and the second metal electrode 7-2 start to undergo slow hydrolysis, releasing metal ions and oxidizing substances. The first metal electrode 7-1 may be a copper electrode, and the second metal electrode 7-2 may be an aluminum electrode. At this time, the copper electrode is hydrolyzed to release a large amount of copper ions, and a certain concentration of copper ions may destroy the protein of the marine circadian clock. And the life is stopped to achieve the purpose of antifouling; the aluminum electrode is hydrolyzed to release a large amount of aluminum hydroxide material, and the inner surface of the subsea valve box 1 and the ballast water valve box 2 and the inner surface of the subsea valve box 1 are formed. A thin layer of oxide protective film for corrosion protection. The seawater treated with the ultraviolet-treated seawater and the metal electrode 7 is separately supplied to the ballast water valve box 2, and is output to the ballast tank 13 and the nacelle 14 through the ballast water valve box 2.

In the embodiment of the present invention, the ultraviolet processing device, the constant current output device and the metal electrode are combined with each other, and by detecting the potential difference between the water and the ship's outer casing, it is determined whether the constant current output device outputs current to the metal electrode for electrolysis, thereby killing or In order to achieve the purpose of anti-pollution and anti-corrosion, the present invention can achieve the killing of marine life by using a system in comparison with the existing two systems of the ballast water treatment system and the anti-marine biological system. The purpose of anti-fouling and anti-corrosion not only saves the cost of shipbuilding, but also saves space for ship installation of ballast water treatment equipment.

Embodiment 3

6 is a flow chart of a method for controlling seawater treatment according to a third embodiment of the present invention. The method is applied to the seawater treatment system described above. As shown in FIG. 6, the method includes:

S301: When receiving the running signal of the ballast pump output, controlling the ultraviolet processing device to turn on the external power The source is such that the ultraviolet treatment device generates ultraviolet rays to kill marine life.

In this embodiment, when the ship performs ballasting, the ballast pump operates to output an operation signal; when the ship does not perform ballasting, the ballast pump does not work, and the output operation signal is interrupted.

Specifically, when the ship performs ballasting, it receives the operation signal of the ballast pump, controls the ultraviolet processing device to turn on the external power source and the ultraviolet output line, turns on the ultraviolet light source, emits a large dose of ultraviolet light, and enters the seawater treatment valve box. A large amount of seawater is treated to kill marine life. At this time, the constant current output device does not operate, and the constant current output line is disconnected.

S302: If it is detected that the ballast pump output operation signal is interrupted, the connection between the ultraviolet processing device and the external power source is cut off, and the constant current output device is controlled to turn on the external power source to cause the constant current output device to output a current signal to the metal electrode to release Metal ions kill or drive marine life inside the submarine valve box.

Specifically, the control constant current output device turns on an external power source to cause the constant current output device to output a current signal to the metal electrode, including: receiving a potential difference signal between the seawater sent by the potential detecting device and the ship casing; when detecting the When the potential difference signal is less than the set value, the constant current output device is controlled to output a current signal to the metal electrode.

In this embodiment, the constant current output device turns on the external power source, and whether the output current signal is also dependent on the potential difference between the seawater and the ship's outer casing. When the ship is in the fresh water area, the salt content in the water is reduced, the electrical resistivity is increased, and the potential difference between the seawater and the ship's outer shell is large. At this time, the salt content of the seawater is very low, which is fresh water; when the ship is in the seawater area The salt content in the water increases, the electrical resistivity decreases, and the potential difference between the seawater and the hull is small. Moreover, the method further includes: controlling the constant current output device to output a current signal to the metal electrode when detecting that the potential difference signal is less than a set value. Here, the set value differs depending on the salt content of seawater in the seawater region where the ship is located, and preferably 500 mV.

Specifically, if the detected potential difference signal is less than 500 mV, the ship is in the seawater region, and the controlled constant current output device outputs a current to the metal electrode provided in the subsea valve box, and the metal electrode starts to be hydrolyzed. Among them, the output current signal is a constant small current signal, and the size is 2A or less. The metal electrode is divided into a first metal electrode and a second metal electrode, wherein the first metal electrode may be a copper electrode and the second metal electrode may be an aluminum electrode. When the first metal electrode is a copper electrode, the copper electrode is electrolyzed to release copper ions, and the copper ions are toxic, thereby killing or driving away marine organisms; the second metal electrode is an aluminum electrode, and the aluminum electrode is electrolyzed to release aluminum hydroxide. The floc adheres to the wall of the pipe to form a protective film, which can effectively protect the pipe wall from corrosion and thereby achieve the anticorrosion effect.

In this embodiment, when it is detected that the potential difference signal is greater than a set value, the constant current output device is controlled to be turned off, and the constant current output device does not output current.

Specifically, if the detected potential difference signal is greater than 500mV, the ship is in a fresh water area, there is no marine life, and there is no need to kill or drive the marine organism. At this time, the constant current output device is turned off, and the constant current output device is not Output current.

In this embodiment, according to the operation signal outputted by the ballast pump, the ultraviolet treatment device or the constant current output device is controlled to be turned on or off, so that the vessel uses the ultraviolet treatment device when the ballast is used, and the constant current output device is used when the ballast is not pressed. The seawater is treated with the metal electrode to kill the marine life, thereby achieving the purpose of antifouling and anticorrosion of the marine pipeline. Compared with the existing ballast water treatment system and the anti-marine biological system for seawater treatment, the method adopted in this embodiment can save the cost of shipbuilding, reduce the power consumption of the ship, and save the ship's installation of ballast water treatment equipment. space.

Note that the above are only the preferred embodiments of the present invention and the technical principles applied thereto. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various modifications, changes and substitutions may be made without departing from the scope of the invention. Therefore, though The present invention is described in detail by the above embodiments, but the present invention is not limited to the above embodiments, and other equivalent embodiments may be included without departing from the scope of the present invention. It is determined by the scope of the appended claims.

Claims

A seawater treatment system, comprising: a subsea valve box, a ballast water valve box, a ballast pump, an ultraviolet treatment device, a control device, a constant current output device, and a metal electrode;

The ballast pump is connected to the ballast water valve box through a pipeline for injecting seawater into the ballast water valve box when an external power source is turned on, and outputting an operation signal;

The control device is electrically connected to the ballast pump for controlling the ultraviolet processing device to turn on an external power source when receiving the operation signal;

The ultraviolet processing device is connected to the control device and disposed between the ballast pump and the ballast water valve box for generating ultraviolet rays to kill marine organisms when the external power source is turned on;

The control device is connected to the constant current output device, and is further configured to cut off the connection between the ultraviolet processing device and an external power source when the operation signal is interrupted, and control the constant current output device to turn on an external power source;

The constant current output device is disposed between the ballast pump and the subsea valve box for outputting a current signal to the metal electrode when the external power source is turned on;

The metal electrode is disposed in the subsea valve box, and is connected to the constant current output device for releasing metal ions according to the received current signal to kill or drive marine life in the submarine valve box;

The subsea valve box and the ballast water valve box are connected by a pipeline for injecting seawater into the ballast water valve box when the ballast pump does not output an operation signal;

The ballast water valve box is used to treat seawater and inject seawater into the ballast tank and the nacelle.
A seawater treatment system according to claim 1, further comprising a potential detecting means and a control means, said potential detecting means being provided on the metal electrode for detecting a potential difference signal between the seawater and the ship's outer casing, and The detected potential difference signal is sent to the control device;

The control device is electrically connected to the potential detecting device for receiving the potential difference signal, and when the received potential difference signal is less than a set value, controlling the constant current output device to output current to the metal electrode signal.
The system according to claim 2, wherein said control means is further configured to control said constant current output means to be turned off when said received potential difference signal is greater than said set value.
The system according to claim 1, further comprising a seawater treatment valve box; said ultraviolet treatment device being disposed in said seawater treatment valve box;

The ballast pump injects seawater into the ballast water valve box through the seawater treatment valve box.
The seawater treatment system according to claim 1, wherein said metal electrode is further configured to release oxide according to said received current signal to said subsea valve box and said ballast water valve box An anticorrosive protective film is formed between the pipe and the inner surface of the subsea valve box.
The seawater treatment system according to claim 1, wherein the constant current output device outputs a constant current signal of less than 2A.
The system according to claim 1, wherein the metal electrode comprises a first metal electrode and a second metal electrode, and when the first metal electrode is a copper electrode, the second metal electrode is an iron electrode or aluminum electrode.
A seawater treatment control method, characterized in that the method comprises:

When receiving the running signal of the ballast pump output, controlling the ultraviolet processing device to turn on the external power source, Causing the ultraviolet treatment device to generate ultraviolet rays to kill marine life;

When detecting that the operation signal is interrupted, disconnecting the ultraviolet processing device from an external power source, and controlling the constant current output device to turn on an external power source to cause the constant current output device to output a current signal to the metal electrode to release the metal ion to kill Or drive away marine life in the submarine valve box.
The method according to claim 8, wherein the controlling the constant current output device to turn on the external power source to cause the constant current output device to output the current signal to the metal electrode comprises:

Receiving a potential difference signal between the seawater sent by the potential detecting device and the ship's outer casing;

When it is detected that the potential difference signal is less than a set value, the constant current output device is controlled to output a current signal to the metal electrode.
The method of claim 9 further comprising:

When it is detected that the potential difference signal is greater than a set value, the constant current output device is controlled to be turned off.