KR101049691B1 - Wire / wireless communication remote corrosion monitoring and control system of metal structures - Google Patents

Abstract

PURPOSE: A system for remotely monitoring corrosion and controlling corrosion proof of a metallic structure by wire and wirelessly is provided to remotely monitor the corrosion state of a buried metallic structure and remotely monitor power state of a corrosion measuring unit and automatic ON/OFF hysteresis information on input power of a rectifier. CONSTITUTION: A corrosion measuring unit(1) measures the potential of a metallic structure every a given period of time and transmits the measured potential and remaining power of a battery. A rectifier(2) outputs anticorrosion current to the metallic structure through insoluble anode buried at electrolyte holding the metallic structure, in a switching way and transmits automatic ON/OFF hysteresis information on input power to a corrosion monitoring terminal(3). The corrosion monitoring terminal calculates corrosion measurement, determines whether to control anti-corrosion and determines the amplitude of anticorrosion current.

Description

Wire / wireless communication remote corrosion monitoring and control system for metal structures {SYSTEM FOR MONITORING CORROSION OF METAL INFRASTRUCTURE}

The present invention relates to a wire and wireless communication remote corrosion monitoring and anti-corrosion control system of a metal structure, and more particularly to remotely monitor the corrosion state of the buried metal structure in a set time period, according to the corrosion state of the metal structure according to the monitoring result It is a method to control the corrosion control and wire control system of wire / wireless communication of the metal structure to perform the method control by varying the output of anticorrosive current and to remotely monitor the power on / off history information of the rectifier's input power. Will.

In general, the term "corrosion" is defined as "a substance reacts with its surrounding environment, or the substance itself is altered or its properties are altered." This corrosion is mostly called electrochemical corrosion because it occurs due to the electrochemical reaction caused by the movement of electrons.

When a metal structure reacts with the surrounding environment in an electrolyte such as underground or underwater, it becomes a corrosion cell and generates a corrosion current. When a corrosion cell is formed, the more active and lower potential becomes the anode and corrodes. Corrosion cells consist of four conditions: an anode, a cathode, an electrical path or a metallic path, an ionic path or an electrolyte.

Corrosion detection is based on the reflection of sound and the use of an array sensor and a multi-channel monitoring device to receive sound, analyze it, and process it to find cracks and abnormal points on the metal. Ultrasonic method for detecting corrosion by detecting changes in metal thickness due to corrosion There have been resistance measurement methods for detecting corrosion rate by detecting changes, and electrochemical potential measurement methods for determining the progress of corrosion by measuring electrochemical potentials of metals on metal surfaces in electrolytes. It is a potentiometric method.

The potentiometric method is a method of measuring the natural potential of the reference electrode (Cu / CuSO4) of the metal structure, which is a corrosion test object. The reference electrode is connected to the (+) terminal, and the reference electrode is connected to the immediate upper surface of the anticorrosive object to read the potential value. This value is used to determine whether the metal structure is in the anticorrosive state compared to the anticorrosive standard. When the -850 mV / CSE criterion is used as the anticorrosive standard, the potential of the metal structure is -850 mV or less with respect to the acid copper reference electrode (for example,- If it is maintained at 1000mV) it means that the metal structure is corroded and more than that is corroded.

The current status of corrosion inspection activities in the field of corrosion protection is based on the owners who own the objects of protection (gas pipelines, oil pipelines, water and sewage pipes, various tanks in petrochemical complexes, and other underground metal deposits) Corrosion checks are carried out on an irregular or regular basis in relation to the presence or absence of corrosion on the object.

The above-mentioned corrosion detection is performed by hand intermittently using an analog meta (tester) or a portable chart recorder (EPR), and in this case, the measurement lead wire in the test box for corrosion potential measurement. (The pipe is connected to + and the reference electrode is connected to-), and the corrosion potential needs to be measured for a predetermined time by moving to a point where the measurement is easy. Therefore, the measurement takes a long time.

Therefore, in recent years, corrosion monitoring devices that are introduced into the terminal box for corrosion potential measurement have been used, but these devices are installed at the site, store the corrosion information in memory, collect them in the office, and store and analyze the data again through a computer. Hassle still remains.

The foregoing invention refers to the background of the art to which the present invention pertains, and does not mean the prior art which is widely known in the art.

Therefore, the present invention remotely monitors the corrosion state of the buried metal structure at a set time period, and performs the anticorrosive control by varying the output of the anticorrosive current according to the corrosion state of the metal structure according to the monitoring result, and automatically controls the input power of the rectifier. Its purpose is to provide remote corrosion monitoring and control system for wired / wireless communication of metal structures to remotely monitor on / off history information and corrosion status of corrosion tester.

Corrosion monitoring and anticorrosion control system of a metal structure according to the present invention, the corrosion measuring device for measuring the potential value of the metal structure at a set time period, and transmits the measured potential value and the remaining power remaining of the battery; According to a method control signal for determining the magnitude of the method current, the method current is outputted in a switching manner to flow through the insoluble anode embedded in the electrolyte in which the metal structure is installed to the metal structure, and the input power is automatically turned on and off. Rectifier for transmitting to the corrosion monitoring terminal; And calculating the corrosion measurement result value by analyzing the potential value of the metal structure received from the corrosion measurement instrument, and determining whether or not the method is controlled according to the corrosion state of the metal structure using the calculated corrosion measurement result value. Corrosion monitoring terminal for transmitting the anti-corrosive control signal for determining the magnitude of the anticorrosive current according to the corrosion state of the metal structure to the rectifier, and receives and manages the input power automatic on / off history information from the rectifier; However, the corrosion meter is a lithium ion battery for power supply; A potential detector for measuring a potential value of the metal structure; An A / D converter configured to A / D convert the measured potential value; A control unit which controls the potential detection unit to measure the potential value of the metal structure, transmits the measured potential value by wire or wirelessly, and transmits the remaining power of the lithium ion battery to the corrosion monitoring terminal; And a wired / wireless transceiver configured to transmit the potential value and the remaining power of the lithium ion battery under the control of the controller, wherein the rectifier includes: a potential detector configured to measure the potential value of the metal structure; A rectifier output unit for outputting an anticorrosive potential to an electrolyte provided with the metal structure; A control unit which receives the method control signal and controls the method current by the method control signal to be synchronized with a clock signal to flow to the metal structure via an insoluble anode embedded in an electrolyte in which the metal structure is installed in a switching method; A clock generator for outputting the clock signal to the controller; A primary power supply unit for supplying commercial power; A secondary power charger and a secondary ion lithium ion battery for supplying backup power to the rectifier in case of commercial power failure; A timer for digitally counting the scheme current output time of the rectifier output; An alarm generator for generating an alarm when an abnormality is detected in the controller; And a status display unit displaying an abnormality and displaying a potential measurement value and a power supply state when the controller detects an abnormality.

In the present invention, it characterized in that it further comprises a corrosion monitoring terminal, a corrosion measuring device provided at the site where the metal structure is embedded and a repeater for amplifying and transmitting a wired or wireless signal during the rectification period.

In the present invention, the corrosion monitoring terminal interworked with at least one of the communication method of RS-232 and CDMA to provide a method control and potential measurement software, further comprising a corrosion monitoring server for controlling the method of the corrosion monitoring terminal. It is characterized by.

In the present invention, the corrosion monitoring server further comprises a database storing corrosion potential data, anticorrosive potential data, corrosion monitoring program, anticorrosive control program.

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In the present invention, the corrosion monitoring terminal is a wired or wireless transceiver for wired or wireless communication with the corrosion measuring instrument and the rectifier; RS-232 or CDMA communication with the corrosion monitoring server; Receiving the potential value of the metal structure through the wired and wireless transceiver to determine whether the corrosion, and according to the corrosion state of the metal structure, characterized in that it comprises a control unit for controlling to transmit the method control signal to the rectifying terminal.

As described above, the present invention remotely monitors the corrosion state of the buried metal structure at a set time period, and performs the anticorrosive control by varying the output of the anticorrosive current according to the corrosion state of the metal structure according to the monitoring result. Input power Automatic on / off history information and corrosion status of the power meter can be monitored remotely.

1 is a block diagram of a wire and wireless communication remote corrosion monitoring and system control system of a metal structure according to an embodiment of the present invention.
2 is a block diagram of a corrosion meter according to an embodiment of the present invention.
3 is a block diagram of a rectifier according to an embodiment of the present invention.
4 is a block diagram of a corrosion monitoring terminal according to an embodiment of the present invention.
5 is a block diagram of a repeater according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples. These embodiments are only for illustrating the present invention, and the scope of rights of the present invention is not limited by these embodiments.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a block diagram of a wire / wireless communication remote corrosion monitoring and anticorrosion control system of a metal structure according to an embodiment of the present invention, FIG. 2 is a block diagram of a corrosion measuring instrument according to the present embodiment, and FIG. 4 is a block diagram of a corrosion monitoring terminal according to the present embodiment, and FIG. 5 is a block diagram of a repeater according to the present embodiment.

1 to 4, the corrosion monitoring system of the metal structure according to the present embodiment is a corrosion measuring device (1), rectifier (2), corrosion monitoring terminal (3), repeater (4), corrosion monitoring server (5) It includes.

Referring to FIG. 2, the corrosion meter 1 includes a lithium ion battery 16 for power supply, a potential detector 15 for measuring a potential value of a metal structure at predetermined time intervals, and a measured potential value of A / D. A / D conversion unit 14 to convert.
In addition, the corrosion meter 1 controls the potential detector 15 to measure the potential value of the metal structure 7 and transmits the measured potential value and the remaining power of the lithium ion battery 16 to the corrosion monitoring terminal 3. And a wired / wireless transceiver 15 which transmits a potential value and a power remaining amount of the lithium ion battery 16 under wired or wireless control under the control of the controller 13.

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3, the rectifier 2 includes: a potential detector 24 for measuring potential values of the metal structure; a rectifier output unit 27 for outputting anticorrosive potential to an electrolyte provided with the metal structure; and a corrosion monitoring terminal 3. Receives a method control signal for determining the magnitude of the method current from the controller, and controls the method current to flow through the insoluble anode embedded in the electrolyte in which the metal structure is installed in a switching manner in synchronization with the clock signal according to the method control signal. And a clock generator 29 for outputting a clock signal to the controller.

In addition, the rectifier 2 digitally counts the system current output time of the secondary power charging unit 32 and the secondary power lithium ion battery 33 and the rectifier output unit 27 to supply the backup power in case of commercial power failure. The alarm generator 26 generates an alarm when an abnormality is detected in the timer 28, the controller 21, and the abnormality is detected when the controller 21 detects an abnormality. And a status display section 25 for displaying.

The rectifier 2 receives a method control signal for determining the magnitude of the method current from the corrosion monitoring terminal 3, and outputs the method current to the metal structure in a switching manner according to the method control signal. That is, the magnitude of the corrosion protection current is applied according to the corrosion state of the metal structure.
In general, when a switching regulator of PWM (Pulse Width Modulation) is used as the switching method, the driving current is applied to the high pulse of the clock signal, and the driving of the driving current is turned off to the low pulse. That is, in synchronizing the clock current with the clock signal and outputting the clock current, the on / off time of the clock current is controlled by controlling the pulse width of the clock signal.

On the other hand, the rectifier 2 transmits the automatic on / off history information of the input power to the corrosion monitoring terminal (3).
For example, the input power of the rectifier 2 is cut off due to a short circuit, and the like is included in the history information and transmitted to the corrosion monitoring terminal 3. Through this history information, the corrosion monitoring terminal (3) can be managed by remotely monitoring whether the frequency of automatic on / off of the input power is frequently generated due to a short circuit of the rectifier (2) installed in the field.

As used herein, "corrosion" refers to the removal or suppression of one or more conditions among the factors of corrosion of the metal structure. In the corrosion protection sector, it is practically difficult to completely eliminate the conditions of corrosion and employs methods of inhibiting anode or cathode reactions or blocking the flow of electrons or ions using corrosion inhibitors, insulating plates or other methods.

In this embodiment, the cathodic protection method, which is a kind of a method of suppressing the anodic reaction, uses an electric method. Looking at the principle of the electrocorrosion method, since corrosion of the metal occurs in the part where the current flows out through the electrolyte from the metal surface, an artificial inflow of a direct current (anticorrosive current) into the metal surface through the electrolyte causes a cathodic reaction on the metal surface. This is the principle of preventing corrosion.

The rectifier 2 flows a constant direct current through the soil (electrolyte) through the soil (electrolyte) to lower the potential of the metal structure 7 below a certain reference value of -850 mV / CSE in order to prevent corrosion of the metal structure 7. give.

That is, when the potential of the metal structure 7 embedded in the ground and the reference potential of the reference electrode 11 are measured through the terminal box, and the output of the rectifier 2 is set based on the measured potential, the rectifier 2 From the insoluble anode (Hi-Silicon Cast Iron (HSCI)) 12 in which a predetermined anticorrosive current is buried in the ground, and a potential of the metal structure 7 is applied to the reference electrode 11 as it flows to the anticorrosive object through soil. The metal structure 7 is operated by keeping it at or below -850 mV (for example, -1000 mV).

The corrosion monitoring terminal 3 includes a wired / wireless transceiver 35 for wired and wireless communication with the corrosion detector 1 and a rectifier 2, and an RS-232 transceiver for wired and wireless communication with the corrosion monitor server 5. (36) and, via the wired / wireless transceiver 35, receive the potential value of the metal structure 7 to determine whether it is corroded, and transmit the method control signal to the rectifying terminal according to the corrosion state of the metal structure. It includes a control unit 34 for controlling to.

The corrosion monitoring terminal 3 calculates a corrosion measurement result by measuring a corrosion potential from a predetermined location of the metal structure 7 at a predetermined set time period, and controls the method by using the calculated corrosion measurement result value. Determine whether or not.

In other words, the corrosion monitoring terminal 3 analyzes the potential value of the metal structure received from the corrosion measuring device 1 at a set time period, and calculates a corrosion measurement result value, using the calculated corrosion measurement result value. It is determined whether the corrosion control of the metal structure is controlled.

At this time, in the anticorrosive control determination, the anticorrosive control signal for determining the anticorrosive current according to the corrosion state of the metal structure is transmitted to the rectifier 1. Also, it receives and manages input power automatic on / off history information from the rectifier 1.

The repeater 4 amplifies and transmits wired and wireless signals between the corrosion monitoring terminal 3 and the corrosion measuring device 1 and the rectifier 2 provided at the site where the metal structure 7 is embedded.

The corrosion monitoring server 5 interlocks with the corrosion monitoring terminal 3 in an RS-232 communication manner to provide a method control and a potential measurement software and to control the method of the rectifier 2.

The corrosion monitoring server 5 includes a database 51 for storing corrosion potential data, anticorrosive potential data, corrosion monitoring program, and anticorrosive control program.

Referring to the operation of the corrosion monitoring and corrosion control system of the metal structure according to the present embodiment configured as described above are as follows.

First, the corrosion measuring device 1 measures the potential value of the metal structure 7 at a set time period, and transmits the measured potential value and the remaining power of the lithium ion battery 16 to the corrosion monitoring terminal 3.

The corrosion monitoring terminal 3 receives the potential value of the metal structure 7 from the corrosion measuring device 1 to determine whether it is corroded, and receives the remaining power of the corrosion measuring device 1 to determine the corrosion of the corrosion measuring device 1 installed in the field. Manage power status.

In other words, the corrosion monitoring terminal 3 analyzes the potential value of the metal structure received from the corrosion measuring device 1 at a set time period, and calculates a corrosion measurement result value, using the calculated corrosion measurement result value. It is determined whether the corrosion control of the metal structure is controlled.
At this time, in the anticorrosive control determination, the anticorrosive control signal for determining the anticorrosive current according to the corrosion state of the metal structure is transmitted to the rectifier 1. Also, it receives and manages input power automatic on / off history information from the rectifier 1.

Here, the corrosion monitoring terminal 3 is interlocked with the corrosion monitoring server 5 in the RS-232 communication method, receives the method control and the potential measurement software, and controls the method of the rectifier 2.

Then, the rectifier 2 causes the anticorrosive current to flow to the metal structure via the insoluble anode 12 embedded in the electrolyte in which the metal structure 7 is installed according to the anti-corrosion control signal received.

For example, a constant direct current is flowed through the soil (electrolyte) to the anticorrosive object to lower the potential of the rectifier 2 metal structure 7 below a certain reference value of -850 mV / CSE so that the metal structure 7 is operated. do.

As described above, the present invention remotely monitors the corrosion state of the buried metal structure at a set time period, and performs an anticorrosive control by varying the output of the anticorrosive current according to the corrosion state of the metal structure according to the monitoring result, and inputting power of the rectifier. Remote monitoring of automatic on / off history information and corrosion status of the corrosion detector.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1: corrosion meter 2: rectifier
3: corrosion monitoring terminal 4: repeater
5: corrosion monitoring server 6: communication network

Claims (7)

Corrosion measuring device for measuring the potential value of the metal structure at a set time period, and transmits the measured potential value and the remaining power remaining of the battery;
According to a method control signal for determining the magnitude of the method current, the method current is outputted in a switching manner to flow through the insoluble anode embedded in the electrolyte in which the metal structure is installed to the metal structure, and the input power is automatically turned on and off. Rectifier for transmitting to the corrosion monitoring terminal; And
Analyze the potential value of the metal structure received from the corrosion measuring device to calculate a corrosion measurement result value, and using the calculated corrosion measurement result value to determine whether or not the anticorrosion control according to the corrosion state of the metal structure, anticorrosion control And a corrosion monitoring terminal configured to transmit the anti-corrosion control signal for determining the magnitude of the anticorrosive current according to the corrosion state of the metal structure to the rectifier and to receive and manage input power automatic on / off history information from the rectifier. ,
The corrosion measuring device is a lithium ion battery for power supply; A potential detector for measuring a potential value of the metal structure; An A / D converter configured to A / D convert the measured potential value; A control unit which controls the potential detection unit to measure the potential value of the metal structure, transmits the measured potential value by wire or wirelessly, and transmits the remaining power of the lithium ion battery to the corrosion monitoring terminal; And a wired / wireless transceiver configured to transmit the potential value and the remaining power of the lithium ion battery under the control of the controller.
The rectifier includes: a potential detector for measuring a potential value of the metal structure; A rectifier output unit for outputting an anticorrosive potential to an electrolyte provided with the metal structure; A control unit which receives the method control signal and controls the method current by the method control signal to be synchronized with a clock signal to flow to the metal structure via an insoluble anode embedded in an electrolyte in which the metal structure is installed in a switching method; A clock generator for outputting the clock signal to the controller; A primary power supply unit for supplying commercial power; A secondary power charger and a secondary ion lithium ion battery for supplying backup power to the rectifier in case of commercial power failure; A timer for digitally counting the scheme current output time of the rectifier output; An alarm generator for generating an alarm when an abnormality is detected in the controller; And a status display unit for displaying the presence of an abnormality when the controller detects an abnormality and displaying a potential measurement value and a power supply state.
The method of claim 1,
Wire and wireless communication remote corrosion monitoring and method of the metal structure, characterized in that it further comprises a corrosion monitoring terminal, a corrosion measuring device provided in the site where the metal structure is embedded and a repeater for amplifying and transmitting a wired or wireless signal during the rectification period. Control system.
The method of claim 1,
Corrosion monitoring terminal and at least one of the communication method of RS-232 and CDMA interworking to provide a method control and potential measurement software, further comprising a corrosion monitoring server for controlling the method of the corrosion monitoring terminal Wire / wireless communication remote corrosion monitoring and control system of metal structures.
The method of claim 3, wherein the corrosion monitoring server
Wire and wireless communication remote corrosion monitoring and anticorrosive control system of a metal structure further comprises a database storing corrosion potential data, anticorrosive potential data, corrosion monitoring program, anticorrosive control program.
delete delete The method of claim 1, wherein the corrosion monitoring terminal
A wired / wireless transceiver for performing wired or wireless communication with the corrosion detector and the rectifier;
RS-232 or CDMA communication with the corrosion monitoring server;
Receiving the potential value of the metal structure via the wired / wireless transceiver to determine whether the corrosion, and a control unit for controlling to transmit the method control signal to the rectifying terminal according to the corrosion state of the metal structure. Wire and wireless communication remote corrosion monitoring and system control system of the structure.

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