JP2004133596A - Plant monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect any symptom of the degradation of equipment that forms a plant or abnormality in an initial condition relating to damage, without stopping the operation of the plant nor using personnel. <P>SOLUTION: A diagnostic device for plant failure receives via a noncontact IC tag information on measuring made by sensors, makes a diagnosis on changes in this sensor measuring information within a given period of time, and specifies the mounting position of the sensor from which any trouble was found. The diagnostic device continues to operate the equipment which forms the plant, by making a diagnosis to see whether or not the operating condition of the equipment is within a preset range, and changing the operating condition if the operating condition is determined to be out of the range. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plant monitoring system for diagnosing a failure of each plant component device constituting a plant or monitoring an operation state.
[0002]
[Prior art]
FIG. 5 shows an example of a plant component of a flue gas desulfurization system in a thermal power plant. Here, the plant components include a boiler auxiliary device such as a boiler 51, an air heater 52, and the like, flue gas treatment systems 53, 54, 55, and 56, and a control center 57 that manages the entire plant.
By the way, among the plant components described above, for example, in the boiler 51, a heat transfer tube may be broken inside the boiler. At this time, in order to detect the damaged position, conventionally, the operation status (temperature of each part, boiler flow rate, etc.) is monitored from the outside, or an inspector examines the sound accompanying the steam leak from the outside. I was Conventionally, there is no hardware for performing a failure diagnosis of the above-described high-temperature plant, a rotating body, and the like (see Patent Document 1).
[0003]
[Patent Document 1]
JP 2002-169612 A
[Problems to be solved by the invention]
Further, even if it was found that the steam was leaking, the exact position related to the leak location could not be determined. Therefore, after the steam leak occurred, the operation of the plant was stopped, and after the temperature dropped, the investigator entered the inside of the boiler and visually checked the leak position. After detecting the location of the leak, it was necessary to arrange the heat transfer tube material used for the location of the leak, wait for processing at the factory, and install it. I was
On the other hand, in the electric power industry, it took time to perform a round-trip inspection of all plant components in order to respond with a small number of inspectors to enhance competitiveness. In addition, since it was difficult to inspect all valves and rotating machines of plant components, it was difficult to detect abnormalities of these plant components at an early stage, and repairs required a lot of work. It had led to such damage.
[0005]
The present invention has been made in view of the above-described circumstances, and in addition to the boiler described above, detects signs of deterioration of plant component equipment, or abnormalities in an initial state related to breakage, without detecting operation of the plant unattended. Accordingly, an object of the present invention is to provide a plant monitoring system that prevents accidents before they occur.
It is another object of the present invention to provide a plant monitoring system capable of continuously operating the plant by changing the operating conditions of the plant when an abnormality is detected.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is a plant monitoring system that performs a failure diagnosis of each plant component device constituting a plant, a plurality of sensors mounted at any location of the plant component device, A plurality of non-contact IC tags that are connected to each of the sensors and capture and transmit the measurement information by the sensor, and sequentially receive the measurement information by the sensor through the plurality of non-contact IC tags within a predetermined time. A plant failure diagnosis device for diagnosing a change in sensor measurement information and specifying a mounting position of the sensor when an abnormality is detected.
[0007]
According to the present invention, a plant failure diagnosis device sequentially receives measurement information from a sensor via a non-contact IC tag and diagnoses a change in sensor measurement information within a predetermined time. A plant monitoring system that can detect signs of deterioration of plant component equipment or abnormalities in the initial state related to damage without stopping plant operation by identifying the mounting position of the plant, and prevent accidents before they happen Can be provided.
[0008]
Further, the present invention is a plant monitoring system for monitoring an operation state of each plant component device constituting a plant, wherein a plurality of sensors mounted at arbitrary portions of the plant component device are connected to each of the sensors. A plurality of non-contact IC tags that capture and transmit wirelessly the measurement information from the sensor and, via the plurality of non-contact IC tags, sequentially receive the measurement information from the sensor and set in advance the plant constituent devices. A plant failure diagnosis apparatus for diagnosing whether or not it is within a range of operating conditions, changing the operating condition when it is recognized that the plant is not within the range of operating conditions, and continuing the operation of the plant component equipment. And the following.
[0009]
According to the present invention, a plant failure diagnosis device sequentially receives measurement information from sensors via a plurality of non-contact IC tags and diagnoses whether or not the operation condition of a plant component is set in advance. Then, when it is determined that the operation condition is not within the range, the operation condition is changed, so that it is possible to provide a plant monitoring system capable of continuously executing the operation of the plant component device.
[0010]
Further, in the present invention, the sensor and the non-contact IC tag are covered with a heat-resistant material and are integrated into an arbitrary part of each of the above-mentioned plant components.
According to the present invention, the sensor and the non-contact IC tag are formed as an integral type covered with a heat-resistant material, and embedded and used in an arbitrary part of each component device in a plant, so that the measurement in a high-temperature environment, which has conventionally been difficult to measure, It can be mounted on the underlying plant components, and fault diagnosis can be performed.
[0011]
In the present invention, the sensor is a composite mechanical sensor that measures at least sound, temperature, and pressure.
According to the present invention, a plurality of measurement information can be transmitted simultaneously via one non-contact IC tag by integrating the composite mechanical sensor.
[0012]
Further, in the present invention, the sensor further includes an optical fiber gas sensor that detects a chemical component of a gas introduced through a gas introduction path by irradiating light and measuring light passing therethrough or reflected light. It is characterized by the following.
According to the present invention, a plurality of types of measurement information can be monitored at one time by integrating a mechanical sensor and a chemical component analysis sensor.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a diagram showing a configuration example of a sensor mounted at an arbitrary position of a plant component device in the plant monitoring system of the present invention.
In FIG. 1, reference numeral 10 denotes a sensor-integrated capsule mounted at an arbitrary position of a plant component device in the plant monitoring system of the present invention, and includes a sensor 1, a non-contact IC tag 2, a chemical component analysis sensor 3, and a microminiature sensor. A CCD camera 4 and a camera power supply 5 are enclosed in a heat-resistant glass 7.
Here, the mechanical sensor 1 is a composite sensor that measures each of vibration (acceleration), pressure, and temperature. The internal structure of the non-contact IC tag 2 is shown in FIG. 2, and is characterized by receiving power supply via an antenna installed near the mounting position and transmitting and receiving information without a battery.
[0014]
That is, as shown in FIG. 2, the non-contact IC tag 2 includes an A / D (Analog / Digital) converter 21, an ID memory 22, and a wireless transmission / reception circuit 23 which are commonly connected to an internal bus 25 of the CPU 24. Is configured.
The A / D converter 21 takes in various types of measurement information obtained through the mechanical sensor 1 connected thereto, and via a wireless transmission / reception circuit 23, an antenna installed nearby and a plant failure diagnosis device in a control center. It has the function of wireless transmission to The ID memory 22 stores identifier information (ID) uniquely assigned to the mechanical sensor 1 and wirelessly transmits the ID information together with the measurement information via an antenna. Is the original data for specifying The CPU 24 is used to receive a command related to re-measurement or the like from the plant failure diagnosis device and execute the command, but is not an essential component for realizing the present invention.
[0015]
The description returns to FIG. An optical fiber for detecting a chemical component of a gas introduced through a gas introduction path 31 by irradiating a semiconductor laser beam and measuring the passing or reflected light thereof. Gas sensor.
The plant failure diagnosis device at the control center (not shown) uses the chemical component analysis sensor 3 and the measurement information obtained via the oscillation unit (not shown) to check the relationship between the wavelength and the wave light value and analyze the accident condition and the like. Is possible.
The micro CCD camera 4 is mounted in the sensor-integrated capsule 10 together with the camera power supply 5. An image of the inside of the plant component equipment can be photographed via the microminiature CCD camera 4 and transmitted to the plant failure diagnosis device at the control center via the small communication cable 6.
The above-described mechanical sensor 1, non-contact IC tag 2, chemical component analysis sensor 3, microminiature CCD camera 4, and camera power supply 5 are covered with heat-resistant glass 7 and are integrally formed.
Note that the CCD camera 4 and the camera power supply 5 are not essential components for realizing the present invention.
[0016]
According to the plant monitoring system of the present invention, the sensors 1 and 3 and the non-contact IC tag 2 are covered with the heat-resistant glass 7 and attached as an integrated sensor-integrated capsule 10 to an arbitrary part of a plant component or attached. Some parts shall be embedded and used.
For example, the above-mentioned capsule is attached to several places inside and outside the boiler. At this time, an acoustic sensor for capturing at least acoustic information (sound wave) is mounted as a mechanical sensor 1 in the sensor-integrated capsule 10 as a part of the composite sensor. An antenna (not shown) is installed near the mounting position of the sensor-integrated capsule 10, and power (electromagnetic waves) is supplied to the non-contact IC tag 2 via the antenna and the antenna (not shown) To receive the sensor measurement information.
The plant failure diagnosis device takes in the acoustic information (sound wave) obtained by the acoustic sensor via the above-described sensor-integrated capsule 10 and the antenna, and, based on the acoustic information transmitted by the non-contact IC tag 2, when the steam leaks, From the difference between the sensed sound volume and the arrival time of the leaked sound, it is possible to accurately detect at which position in the boiler the steam is leaking. Furthermore, by attaching this sensor to the entrance and exit of each tube group of the boiler heat transfer tubes, it is possible to identify the tube in which an abnormality has occurred.
[0017]
Further, it is assumed that the sensor-integrated capsule 10 in which the acoustic sensor is mounted at two different positions (steam entrance / exit) of the same boiler heat transfer tube is mounted directly or via an acoustic guide installed at the position. An antenna is installed near the sensor-integrated capsule 10, and receives an acoustic signal from the non-contact line tag 2 via the antenna.
The received signal is broken down by the plant failure diagnosis device in the control center, where the sound generated when a steam leak occurs is detected to detect the leak, and the leak is detected based on the time difference until the sound is detected. The location of occurrence can also be known.
[0018]
FIG. 3 is a flowchart showing the flow of processing by the plant failure diagnosis device. Here, an example is shown in which, when an abnormality (steam leakage) is detected, a specialized maintenance person is requested to recover.
First, the plant failure diagnosis device receives acoustic information and accumulates the acoustic information in a time series for a predetermined time (S31). Then, a change in the intensity of the acoustic information within a predetermined time is checked by comparing the frequency spectrum data at the time of occurrence of abnormality stored in the database (DB) in advance (S32). Here, if the frequency spectrum substantially matches the frequency spectrum stored in the DB, occurrence of an abnormality, in this case, leakage of steam is detected.
[0019]
At this time, the sensor-integrated capsule 10 (non-contact tag 2) mounted on the abnormality occurrence location is further specified (S33). The ID stored in the ID memory 22 is transmitted from the sensor-integrated capsule 10 in addition to the acoustic information.
Therefore, the plant failure diagnosis apparatus can identify the mounting position by searching a table stored in the DB that shows the correspondence between the ID of the non-contact IC tag 2 and the mounting position on the plant component device. it can.
Then, a recovery request is made to a specialized maintenance person based on the mounting position information. At this time, the maintenance information is read out from the DB by reading out the design information including the material and dimensions recorded in accordance with the mounting position of the sensor-integrated capsule 10 and notified together with the previous mounting position. Efficiency is improved.
If there is a difference from the frequency spectrum data at the time of abnormality (there is no change in intensity within a predetermined time), the operation is continued.
[0020]
Next, the processing of the plant failure diagnosis apparatus when the operating conditions are dynamically changed when an abnormality is detected and the operation is continued will be described with reference to the flowchart shown in FIG.
The processing from the reception of the acoustic information by the plant failure diagnosis apparatus to the accumulation of the information as time-series data is the same as the example shown in FIG. 3 described above (S41). Here, a comparison with the actual operation value of the plant stored in the DB is performed (S43), and it is determined whether or not it is close to a preset condition setting parameter relating to temperature, pressure, gas amount, vibration, and the like. If it is checked and approximated, it is regarded as being within the set range, and the operation is continued.
On the other hand, when it is far from the setting range, the setting of the operating condition is changed (S45), and the sensor measurement information obtained as a result of the operation based on the operating condition is again compared with the operating condition, and the operating condition is within the set range. It is checked whether it is (S44). This comparison operation is retried about 2-3 times (n times) and executed (S43). If the retry is out of the set range even after retrying n times, the operation is stopped and, as in the embodiment shown in FIG.
[0021]
For the operating conditions, the upper and lower limits are set for each parameter. Here, it is determined how many times the upper and lower limits have been exceeded continuously, or the average is calculated to be within the range. It is determined whether or not there is. For the setting of the operating conditions, the setting is permitted for each user. For the changing of the operating conditions, a plurality of operating conditions are set for each sensor in advance and stored in the DB. May be selected.
[0022]
In the above, only the case where the sensor-integrated capsule 10 is installed in a boiler has been described. Hereinafter, the case where the capsule 10 is installed in a plant component other than the boiler will be described.
Many various valves are installed in a plant component, and it is necessary to detect whether or not these valves are operating normally. Therefore, when the sensor-integrated capsule 10 is mounted on each valve, the inspector wears a wearable computer that supplies power for signal reception and goes around, and when approaching the sensor-integrated capsule 10 installed on each valve, Read measurement information wirelessly. Then, by transmitting the data wirelessly to the plant failure diagnosis device of the control center, the abnormality is detected by the plant failure diagnosis device, and the presence / absence of the abnormality is determined by the wearable computer worn by the inspector. It is also conceivable to notify the symptom or the like in the case where there is.
In addition, an antenna is installed near the sensor-integrated capsule 10, and each valve distributes a signal to the antenna via the sensor-integrated capsule 10, and the signal is analyzed by the plant failure diagnosis device of the control center, so that the valve is controlled. It is also possible to monitor abnormalities.
[0023]
By mounting the sensor-integrated capsule 10, it is also conceivable to detect the occurrence of vibration due to deterioration of a device having an internal device that comes into contact with high-pressure high-speed steam, such as a steam drum or a heating reducer.
That is, since these devices are used in a high-temperature environment, for example, a guide for transmitting sound is installed by welding or the like, and several sensor-integrated capsules 10 are mounted at the tip of the guide, and these sound information is stored in the vicinity. Is received by the antenna arranged in the control center, and the frequency is analyzed by the plant failure diagnosis device of the control center. As a result, the plant failure diagnosis device can detect the sound generated when the internal device of the plant component has deteriorated, and can detect the presence or absence of an abnormality during operation.
Furthermore, in a rotating part such as a compressor or a pump, a sensor-integrated capsule 10 including a mechanical sensor for detecting vibration is mounted, and an abnormality is detected by monitoring a change in vibration in the same manner as in the above-described example of the valve. It is also possible.
[0024]
【The invention's effect】
INDUSTRIAL APPLICABILITY As described above, according to the present invention, signs of deterioration of plant components during the operation of the plant, or the initial stage of damage can be detected unattended, so that major accidents occurring in these plants can be prevented beforehand. Will be able to
In addition, since an accident that has occurred can be detected at an early stage, necessary restoration work can be performed promptly thereafter, and damages due to plant shutdown due to the accident can be minimized. It is possible to provide a plant monitoring system capable of performing the above.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a sensor mounted at an arbitrary position of a plant component device in a plant monitoring system of the present invention.
FIG. 2 is a block diagram showing an internal configuration of a non-contact IC tag mounted on a plant component device in the plant monitoring system of the present invention.
FIG. 3 is a flowchart cited for explaining processing by a plant failure diagnosis device used in the plant monitoring system of the present invention.
FIG. 4 is a flowchart cited for explaining processing by a plant failure diagnosis device used in the plant monitoring system of the present invention.
FIG. 5 is a diagram illustrating an example of plant components in a thermal power plant.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mechanical sensor, 2 ... Non-contact IC tag, 3 ... Chemical composition analysis sensor, 7 ... Heat resistant glass, 10 ... Sensor integrated capsule, 21 ... A / D converter, 22 ... ID memory, 23 ... Wireless transmission / reception circuit

Claims (5)

A plant monitoring system for performing a failure diagnosis of each plant component device constituting the plant,
A plurality of sensors mounted at any location of the plant component equipment,
A plurality of non-contact IC tags that are connected to each of the sensors and capture and transmit wirelessly the measurement information from the sensors;
A plant for sequentially receiving measurement information from the sensor via the plurality of non-contact IC tags, diagnosing a change in sensor measurement information within a predetermined time, and specifying a mounting position of the sensor when an abnormality is recognized A failure diagnosis device;
A plant monitoring system comprising: A plant monitoring system for monitoring an operation state of each plant component device constituting the plant,
A plurality of sensors mounted at any location of the plant component equipment,
A plurality of non-contact IC tags that are connected to each of the sensors and capture and transmit wirelessly the measurement information from the sensors;
Via the plurality of non-contact IC tags, sequentially receive the measurement information by the sensor and diagnose whether or not it is within a preset operating condition range of the plant component, and within the operating condition range When it is recognized that there is no change in the operating conditions, a plant failure diagnosis device to continue the operation of the plant component equipment,
A plant monitoring system comprising: 3. The plant monitoring system according to claim 1, wherein the sensor and the non-contact IC tag are covered with a heat-resistant material, and are integrated into an arbitrary part of each of the plant components. 4. The plant monitoring system according to claim 3, wherein the sensor is a combined mechanical sensor that measures at least sound, temperature, and pressure. The sensor may further include an optical fiber gas sensor that detects a chemical component of the gas introduced through the gas introduction path by irradiating light and measuring the light passing therethrough or reflected light. Item 3. A plant monitoring system according to item 3.

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