KR20190135674A - Apparatus for monitoring temperature of plant piping using ofdr - Google Patents

Abstract

The present invention relates to a plant pipe temperature monitoring apparatus using OFDR. The apparatus includes: a light source part outputting light with a designated light source; a light sensor part sensing reflected light or scattering light as a light signal inputted by the reflection of the light outputted from the light source part, and then, converting the signal into an electric signal and outputting the signal; an OFDR signal measurement part measuring and analyzing the light signal outputted through the light sensor part, using optical frequency domain reflectometry (OFDR); a signal processing part preprocessing the light signal to make the signal into a form able to be easily measured and analyzed by the OFDR signal measurement part, or postprocessing the signal measured and analyzed by the OFDR signal measurement part to make the signal into a form enabling a control part to diagnose the condition of a pipe; and the control part diagnosing or periodically monitoring the condition of a valve by using the light signal measured and analyzed through the OFDR signal measurement part.

Description

Plant piping temperature monitoring device using OFDR {APPARATUS FOR MONITORING TEMPERATURE OF PLANT PIPING USING OFDR}

The present invention relates to a plant piping temperature monitoring apparatus using OFDR, and more particularly, to diagnose the state including the temperature of the plant piping connected to the valve using optical frequency domain reflectometry (OFDR) or periodically The present invention relates to a plant piping temperature monitoring device using OFDR, which enables monitoring.

In general, a pipe for transporting a fluid is provided with a valve for shutting off the supply of fluid when necessary.

In particular, in petrochemical plants that handle fluids such as corrosive gases, solutions, or combustible gases, fluids that are transported through pipes may cause safety problems when leaked to the outside.

For example, in the case of a power plant, a leak of a valve may lead to a shutdown of the power plant. In particular, in a nuclear power plant, leakage of fluid from a valve may cause serious problems such as leakage or contamination of radioactive material.

Therefore, it is necessary to detect the leakage of the fluid at the valve engagement portion.

Accordingly, Republic of Korea Patent No. 10-1664314 (October 04, 2016, registered valve leakage monitoring system) is disclosed as a background technology of the present invention, in this technology, an optical fiber sensor to which OTDR / A (Optical Time Domain Reflectometer / Analysis) is applied. Disclosed is a method of determining and treating a fluid leak using a.

However, the method presented in the background art utilizes a pulsed laser light source, and the position resolution is considerably large (ie, inaccurate diagnosis accuracy) of several meters or less, and the measurement distance cannot be measured at a short distance (e.g., several meters). There is a problem that can only measure (at least several kilometers).

Therefore, there is a need for a method capable of accurate position diagnosis, such as measurement (state diagnosis) at a short distance (eg, several meters) and a long distance (eg, several kilometers), and a low position resolution (eg, several mm to several tens of mm).

According to an aspect of the present invention, the present invention was created to solve the above problems, using a frequency response reflectometry (OFDR) to diagnose or periodically monitor the condition including the temperature of the plant pipe connected to the valve It is an object of the present invention to provide a plant piping temperature monitoring apparatus using OFDR.

Plant piping temperature monitoring apparatus using the OFDR according to an aspect of the present invention, the light source for outputting the light by the specified light source; An optical sensor unit configured to sense reflected light or scattered light and convert the light output from the light source unit into incident light and convert the light into scattered light; OFDR signal measuring unit for measuring and analyzing the optical signal output through the optical sensor unit in the optical frequency region reflection measurement (OFDR) method; The optical signal may be preprocessed and processed or processed into a form that is easy for measurement and analysis in the OFDR signal measuring unit, or after processing the signal measured and analyzed in the OFDR signal measuring unit so that the controller may diagnose a pipe condition. Signal processing unit for processing in the form; And a controller for diagnosing or periodically monitoring a valve state by using the optical signal measured and analyzed by the OFDR signal measuring unit, wherein the controller is connected to the OFDR signal measuring unit to measure and analyze the optical signal. The result of the diagnosis may be diagnosed by referring to a predetermined analysis table or database, and the light source unit may include a light source for outputting laser light, and may be output by varying the wavelength or frequency of light under the control of the controller. It is characterized by.

In the present invention, the control unit receives reflected light or scattered light as an optical signal through an optical sensor unit, and measures and analyzes an optical frequency domain reflection signal (OFDR signal) in the received optical signal through the OFDR signal measurement unit, The optical signal is preprocessed by the signal processor, and processed or processed into a form that is easy for measurement and analysis by the OFDR signal measurer, or the signal measured and analyzed by the OFDR signal measurer by the signal processor. After processing, the control unit processes the condition of the pipe connected to the valve or the state of the valve connected to the pipe in the form that can be diagnosed, and also the optical signal (OFDR signal) measured and analyzed by the OFDR signal measuring unit, or the OFDR Analyze the optical signal (post-processed OFDR signal) after processing the signal measured and analyzed by the signal measuring unit, and measured and analyzed by the OFDR signal measuring unit. The result of analyzing the signal may be referred to a predetermined analysis table or database to diagnose a pipe or a valve connected thereto.

In the present invention, the control unit drives the light source unit, receives the optical signal by driving the optical sensor unit in a predetermined order among a plurality of optical sensor units installed in the pipe, and after the specified time has elapsed, all the installed light When the optical signal reception is completed by driving the sensor unit, and if the optical signal reception for all the optical sensor units is not completed, the optical sensor unit selects the optical sensor unit in the next order in a predetermined order and receives the optical signal in a predetermined time. The process is repeated, and thus, when the optical signal reception is completed by driving all the installed optical sensors, the condition of the pipe or the valve connected thereto is diagnosed using the optical signal reception result.

According to an aspect of the present invention, the present invention enables the diagnosis or periodic monitoring of the condition of the plant pipe connected to the valve using the optical frequency domain reflectometry (OFDR).

According to another aspect of the present invention, the present invention makes it possible to quickly and precisely diagnose the condition of a pipe through position resolution of several mm at a measurement distance of several km using optical frequency region reflection measurement (OFDR).

According to another aspect of the present invention, the present invention makes it possible to diagnose conditions for thousands to hundreds of thousands of points (or channels) of piping using optical frequency domain reflectometry (OFDR).

1 is an exemplary view showing a table of domestic and overseas major valve leakage accidents.
2 is an exemplary view showing a schematic configuration of a plant piping temperature monitoring apparatus using OFDR according to an embodiment of the present invention.
Figure 3 is an exemplary view showing the characteristics of the OFDR scheme applied in order to diagnose the valve state including the plant piping temperature using the OFDR in Figure 2 in the form of a table.
4 is a flowchart for explaining a valve condition monitoring method including a plant piping temperature using OFDR in FIG. 2.
5 is an exemplary diagram for explaining a method for diagnosing a valve state including a plant piping temperature using OFDR in FIG. 4.
FIG. 6 is a flowchart illustrating an exemplary driving method of an optical sensor unit for diagnosing a valve state including a plant piping temperature using OFDR in FIG. 4.

Hereinafter, an embodiment of a plant piping temperature monitoring apparatus using OFDR according to the present invention will be described with reference to the accompanying drawings.

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, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is an exemplary diagram showing major domestic and international valve leakage accidents in the form of a table. In 1979, a meltdown of a pressurizer steam discharge valve was caused by a meltdown of a pressurized steam discharge valve in the United States. The explosion caused by the leak caused the Ahyeon-dong gas explosion accident.In 2010, the coolant valve opened automatically, causing the leak of 423 tons of coolant, causing the leak of the Shin-Ki Unit 1 reactor coolant, and connected to the hydrochloric acid storage tank in 2013. The leak of 200 tonnes of hydrochloric acid caused by the breakage of the valve caused the leakage of hydrochloric acid in the Sangju polysilicon plant.

As the leakage of the industrial valve, explosion, rupture, and leakage of chemicals can cause enormous human and property damages. Therefore, a monitoring device or a smart valve is needed to diagnose the leakage of the valve. Situation.

Figure 2 is an exemplary view showing a schematic configuration of a plant piping temperature monitoring apparatus using OFDR according to an embodiment of the present invention.

As shown in FIG. 2, the plant piping temperature monitoring apparatus using the OFDR according to the present embodiment includes a light source unit 110, an optical sensor unit 120, an OFDR signal measurement unit 130, a signal processing unit 140, and a control unit. And 150.

The light source unit 110 outputs (or emits) light by a designated light source.

The light source unit 110 includes a light source for outputting laser light.

The light source unit 110 may output a variable wavelength or frequency of light under the control of the controller 150.

The optical sensor unit 120 senses the reflected light incident by the light output from the light source unit 110 is reflected. In this case, the reflected light may be incident to scattered light scattered in a plurality of forms according to the state, shape, and length of the pipe.

The optical sensor unit 120 is installed at a connection portion of the valve connected to the pipe (or pipe). For example, the photosensor 120 is installed at least in the valve-pipe connection, the valve-valve connection, and the valve cover.

The optical sensor unit 120 senses the reflected light (or scattered light) and converts the converted light into an electrical signal.

The OFDR signal measuring unit 130 measures and analyzes an optical signal (ie, reflected light and scattered light) using an optical frequency region reflection measurement (OFDR) method.

The OFDR signal measuring unit 130 measures a predetermined analysis table (see FIG. 5) in order to measure and analyze an optical signal (ie, reflected light and scattered light) using the OFDR method (for example, a pressure diagnosis table, a temperature diagnosis table, and a distance diagnosis). Tables, etc.) and a database (not shown) can be used.

The OFDR signal measuring unit 130 may perform the measurement and analysis of the optical signal by itself, or may perform the measurement and analysis of the optical signal in association with the control unit 150.

The signal processor 140 processes (or processes) (eg, amplifies, phase modulates, etc.) an optical signal output from the optical sensor unit 120 or a signal analyzed through the OFDR signal measurement unit 130. The optical signal processed (or processed) by the signal processor 140 may be measured and analyzed again through the OFDR signal measurement unit 130.

That is, the OFDR signal measuring unit 130 may measure and analyze an optical signal (that is, reflected light and scattered light) in the OFDR method by using the optical signal output from the optical sensor unit 120 as it is, and the signal processing unit ( Measurement and analysis may be performed using the optical signal processed (or processed) (eg, amplified, phase modulated, etc.) at 140.

The controller 150 diagnoses (or monitors) a valve state by using the optical signal measured and analyzed by the OFDR signal measuring unit 130.

The control unit 150 is connected to the OFDR signal measuring unit 130, and the result of measuring and analyzing the optical signal (that is, reflected light, scattered light) a predetermined analysis table (see Fig. 5) (for example, pressure diagnosis table, Temperature diagnosis table, distance diagnosis table, etc.) or a database (not shown) may be used to diagnose pipe (eg pipe, valve, etc.) conditions.

In this embodiment, the optical sensor unit 120 is a globally distributed sensor including an optical fiber sensor. The OFDR method applied to the present embodiment can obtain a position resolution of several mm at a measurement distance of several kilometers at maximum. Therefore, it is suitable for precise leakage diagnosis of industrial equipment such as valves.

Hereinafter, the OFDR scheme will be described in more detail with reference to FIG. 3.

FIG. 3 is an exemplary view showing the characteristics of the OFDR method applied to diagnose a valve state including a plant piping temperature using the OFDR in the form of a table in FIG. 2.

Referring to FIG. 3, the OFDR method uses a frequency variable laser as a light source, and measures an optical signal using a Rayleigh scattering principle, and a measurement distance is several m to several km, and a position resolution is several mm to several tens of mm. to be. As such, the OFDR method can improve the accuracy of diagnosis because the measurement distance can be measured at both short and long distances and can be measured at both small and large positions.

4 is a flowchart illustrating a valve state monitoring method including a plant piping temperature using OFDR in FIG. 2.

Referring to FIG. 4, the controller 150 receives an optical signal (ie, reflected light and scattered light) through the optical sensor unit 120 (S101).

The controller 150 measures and analyzes an optical frequency domain reflection signal (ie, OFDR signal) from the received optical signal (ie, reflected light and scattered light) through the OFDR signal measurement unit 130 (S102).

In this case, the controller 150 converts the optical signal from the optical sensor unit 120 into an electrical signal through the signal processor 140 and outputs the optical signal in order to measure and analyze the optical frequency region reflection signal (ie, OFDR signal). Can be processed (or processed) (e.g. amplification, phase modulation, etc.).

In addition, the control unit 150, through the signal processing unit 140, pre-process the optical signal, the processing (or processing) (for example, amplification) in a form that is easy for measurement and analysis in the OFDR signal measurement unit 130 , Phase modulation, or the like), or through the signal processing unit 140, post-processes the signal measured and analyzed by the OFDR signal measuring unit 130, so that the controller 150 is connected to a state of the pipe to which the valve is connected ( Alternatively, it may be processed in a form that can diagnose the state of the valve connected to the pipe (for example, in the form of a table that stores the reference information) (S103).

In addition, the control unit 150 may post-process an optical signal measured and analyzed by the OFDR signal measurement unit 130 (ie, an OFDR signal) or a signal measured and analyzed by the OFDR signal measurement unit 130. That is, the processed post-processed OFDR signal) is analyzed (S104).

And the control unit 150 is a predetermined analysis table (see Fig. 5) the result of analyzing the signal measured and analyzed by the OFDR signal measurement unit 130 (for example, pressure diagnostic table, temperature diagnostic table, distance diagnostic table, etc.) ) Or a database (not shown) to diagnose a state of a pipe (eg, a pipe, a valve, etc.) (S105).

FIG. 5 is an exemplary view for explaining a method for diagnosing a valve state including a plant piping temperature using OFDR in FIG. 4.

For example, the controller 150 may diagnose a state of the pipe (eg, a pipe, a valve, etc.) by using a result of analyzing the signal measured and analyzed by the OFDR signal measuring unit 130, or a predetermined analysis table (eg, The pressure diagnosis table 210, the temperature diagnosis table 220, the distance diagnosis table 230, and the like may be referred to.

However, since the analysis table 210, 220, 230 is described as an example, although not shown in the drawings, in another embodiment, the displacement diagnosis table, position diagnosis table, acceleration diagnosis table, gas diagnosis table, chemicals See also diagnostic table.

FIG. 6 is a flowchart illustrating an exemplary driving method of an optical sensor unit for diagnosing a valve state including a plant piping temperature using OFDR in FIG. 4.

Referring to FIG. 6, the controller 150 drives the light source unit 110 (S201).

In addition, the controller 150 receives the optical signal by driving the optical sensor unit 120 (that is, the first optical sensor unit in a predetermined order) (S202).

In this case, since the optical sensor unit 120 may be installed at several hundred points or more, the optical sensor unit 120 may sequentially receive and receive an optical signal in a predetermined order.

After the designated time (eg, water level, water level, etc.) has elapsed (S203), the control unit 150 completes the driving (ie, receiving the optical signal) of all the designated (or installed) optical sensor units 120. Check whether it is (S204).

If the driving (that is, the optical signal reception) of all the optical sensor unit 120 is not completed (NO in S204), the controller 150 selects the optical sensor unit in the next order in a predetermined order (S205).

Thereafter, the controller 150 repeats the steps S202 to S205 until the driving of all the optical sensor units 120 is completed (YES in S204).

Accordingly, when driving (ie, receiving an optical signal) of all of the designated (or installed) optical sensor units 120 is completed, the controller 150 uses a result of receiving the optical signal to pipe (eg, a pipe, a valve, etc.). You can quickly and accurately complete the diagnosis in seconds.

As described above, the present embodiment can diagnose or periodically monitor the condition of the plant piping to which the valve is connected by using the optical frequency region reflection measurement (OFDR), and through the position resolution of several mm at the measurement distance of several kilometers, It is possible to diagnose the condition quickly and precisely, and to simplify the diagnosis of the condition of thousands to hundreds of thousands of points (or channels) of the pipe.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible for those skilled in the art to which the art pertains. I will understand the point. Therefore, the technical protection scope of the present invention will be defined by the claims below.

110: light source unit 120: light sensor unit
130: OFDR signal measuring unit 140: signal processing unit
150 control unit 210 pressure diagnosis table
220: temperature diagnosis table 230: distance diagnosis table

Claims (3)

A light source unit for outputting light by a designated light source;
An optical sensor unit configured to sense reflected light or scattered light and convert the light output from the light source unit into incident light and convert the light into scattered light;
OFDR signal measuring unit for measuring and analyzing the optical signal output through the optical sensor unit in the optical frequency region reflection measurement (OFDR) method;
The optical signal may be preprocessed and processed or processed into a form that is easy for measurement and analysis in the OFDR signal measuring unit, or after processing the signal measured and analyzed in the OFDR signal measuring unit so that the control unit may diagnose a pipe condition. Signal processing unit for processing in the form; And
And a controller for diagnosing or periodically monitoring a valve state by using the optical signal measured and analyzed by the OFDR signal measuring unit.
The control unit diagnoses a pipe state by referring to a predetermined analysis table or database based on a result of measuring and analyzing the optical signal in association with the OFDR signal measuring unit.
The light source unit includes a light source for outputting the laser light, under the control of the controller, the plant piping temperature monitoring apparatus using OFDR, characterized in that for outputting by varying the wavelength or frequency of light.
The method of claim 1, wherein the control unit,
Receives reflected light or scattered light as an optical signal through the optical sensor unit,
Measuring and analyzing an optical frequency domain reflection signal (OFDR signal) from the received optical signal through the OFDR signal measurement unit;
The optical signal is preprocessed through the signal processor to process or process the optical signal in a form that is easy for measurement and analysis in the OFDR signal measurer, or the signal measured and analyzed by the OFDR signal measurer through the signal processor. Post-processing, the control unit is processed in a form that can diagnose the state of the pipe connected to the valve or the state of the valve connected to the pipe,
In addition, an optical signal (OFDR signal) measured and analyzed by the OFDR signal measuring unit or an optical signal (post-processed OFDR signal) which has been post-processed by the signal measured and analyzed by the OFDR signal measuring unit is analyzed.
The plant pipe temperature monitoring apparatus using the OFDR, characterized in that for diagnosing the state of the pipe or the valve connected thereto with reference to a predetermined analysis table or database based on the result of analyzing the signal measured and analyzed by the OFDR signal measuring unit.
The method of claim 1, wherein the control unit,
Driving the light source unit,
Receives an optical signal by driving the optical sensor unit in a predetermined order among a plurality of optical sensor units installed in the pipe,
After the designated time has elapsed, check whether the optical signal reception is completed by driving all of the installed optical sensor units,
If the optical signal reception for all the optical sensor units is not completed, the process of receiving the optical signal is repeated by selecting the optical sensor units of the next order in a predetermined order, at a specified time,
Accordingly, when the optical signal reception is completed by driving all the installed optical sensor unit, the plant pipe temperature monitoring apparatus using OFDR, characterized in that the diagnosis of the pipe or the valve connected thereto using the optical signal reception result.

Images