KR20170050625A - REMOTE MONITORING SYSTEM WITH DATA LOGGER FOR IoT BASED PLANT UTILITY - Google Patents

Abstract

The present invention relates to an IoT-based plant facility remote monitoring system.
The IoT-based facility facility remote monitoring system according to the present invention includes an explosion-proof data logger, the explosion-proof data logger includes an explosion-proof housing, and the sensor interface unit, the sensor interface unit, the A / D converter, A communication unit, the control unit, the RTC unit, and a power supply unit.
The explosion-proof data logger according to the present invention is provided with an RTC unit, and can transmit synchronous processing by sending measurement time together with data measured by various sensors. Also, by sensing temperature and pressure, The data can be corrected appropriately.
The data logger according to the present invention has a communication mode in the form of a USM supporting ISA100.11a, which is an industrial wireless standard, and an M2M terminal supporting LTE, so that it can be used smoothly in a region where wireless communication is poor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring system for plant facilities based on IoT,

The present invention relates to an IoT-based facility facility remote monitoring system, and more particularly, to an IoT-based plant facility remote monitoring system having an explosion-proof data logger capable of remotely monitoring plant facilities based on IoT.

Nuclear power generation, gas, petrochemical, and offshore plants are industries that supply facilities or produce factories that can produce products such as power, gas, and petrochemicals. They supply raw materials or energy to obtain energy, Plant facilities, or production facilities. Plant facilities are complex in many places, and most of them are high-risk facilities. Since many of the plant facilities in Korea are constructed and aged in the 60s and 70s, it is urgent to make decisions on disposal, repair and replacement of facilities. Therefore, most of plant facilities are high-risk facilities that contain high-risk materials. Therefore, it is necessary to continuously monitor and manage plant facilities. It is necessary to promptly locate facilities and quickly respond to the failure or damage of plant facilities.

In particular, high-risk facilities in nuclear power generation / gas / petrochemical / offshore plants are subject to regular preventive maintenance, and gas and chemical spills can lead to large-scale fire and explosion accidents.

In case of fire and explosion accident due to electrical defects and external impacts of measurement equipment, numerous measurement instruments performing surveillance function in the above high-risk facilities may be installed close to pipelines and facilities, and may affect high-risk facilities. Therefore, The system is installed in a separate explosion-proof enclosure. However, when installed in a separate explosion-proof enclosure, the installation cost is increased, resulting in weaker competitiveness and space limitations.

In the case of the wireless data measurement system, most of USN wireless communication technologies in the domestic are mostly Zigbee and Bluetooth communication technologies based on Tiny OS. However, since the conventional USN wireless communication technology has low reliability and security, It is necessary to apply industrial standard wireless communication technology with high reliability and security applicable to high-risk facilities such as the above plant because it is difficult to apply to environment of facilities.

Conventional explosion-proof data loggers used for monitoring high-risk facilities such as plants have the following problems.

The first problem will be explained. Plant facilities often use instantaneous voltage fluctuations during operation due to the various facilities that use high pressure. The explosion-proof data log has an internal battery and can be used as a power source, but it is not easy to replace the internal battery because it is installed in a dangerous plant. Therefore, the explosion-proof data logger generally receives power from the outside, and the voltage fluctuation of the external power source is large and includes a lot of noise. In addition, the electric circuit of the data logger is sometimes burned by the external high voltage current.

Secondly, for accurate analysis by collecting data using data logger, information about the temperature and pressure at the point where the corresponding data logger is installed is required. However, the conventional explosion-proof data logger does not provide such function, There was a problem.

Thirdly, although the data collected in the conventional explosion-proof data logger is wirelessly transmitted in the same manner as the Bluetooth communication method, a malfunction may occur in a poor communication environment in a region where the data logger is installed.

Accordingly, there is a need for an improved explosion-proof data logger device that solves the above-described problems of the conventional explosion-proof data logger.

Korean Patent Laid-Open No. 10-2015-0076908 (published Jul.

The present invention relates to a remote monitoring system for plant facilities based on IoT having an improved explosion-proof data logger by solving the problem of a conventional explosion-proof data logger. More specifically, the present invention eliminates noise included in an external power source, It is possible to supply the internal power with stability and to measure the temperature and pressure at the point where the data logger is installed and to transmit the measured temperature value and the pressure value at the time of data transmission and to use LTE communication And an IoT-based facility facility remote monitoring system having an explosion-proof data logger equipped with a module.

The object of the present invention is to provide an IoT-based plant facility remote monitoring system capable of monitoring the state of a plant structure by collecting and analyzing data obtained by measuring the dynamic state of the plant structure from a sensor, Pressure, and temperature according to vibration, inclination, and stress measured by a sensor unit, and a sensor unit that measures strain, pressure, and temperature data measured by the sensor unit, And a wireless communication unit for transmitting the converted digital data at a short distance and at a long distance, wherein a plurality of explosion-proof data loggers are provided corresponding to a number of one-to-one correspondence with a plurality of sensors of the sensor unit, Collects the collected data and transmits the collected data to the wireless communication unit A gateway unit for transmitting the sensor data transmitted from the gateway unit, a data server unit for receiving the sensor data transmitted from the gateway unit, comparing the data with the management reference value, and generating an alarm sound when the management reference value is exceeded, And the display unit displays the sensor data in a graph and a numerical value to allow the manager to confirm the measurement data transmitted at predetermined time intervals. The explosion-proof data logger includes an explosion-proof housing and an analog-to- An A / D converter for converting the analog data received from the sensor interface unit into digital data, and a control unit for controlling the A / SD that stores measured measurement data A control unit for controlling the data storage of the SD memory unit to display the sensor data measured and controlled by the data transmission of the wireless communication unit on the display module, And a power supply unit for supplying power to the sensor unit, the sensor interface unit, the A / D converter, the wireless communication unit, the control unit, and the RTC unit with a battery or a commercial power source, wherein the sensor unit, Wherein the A / D converter, the wireless communication unit, the control unit, the RTC unit, and the power supply unit are installed inside the explosion-proof housing.

In the IoT-based plant facility remote monitoring system having the explosion-proof data logger according to the present invention, noise included in the external power source is removed and the internal power can be supplied stably even if the input power varies within a considerable range. . In addition, since the temperature and pressure at the point where the data logger is installed can be measured, the measured value can be received together with the data, so that the measurement value can be corrected according to the surrounding environment.

Finally, the data logger according to the present invention has a communication mode in the form of the USN based on the industrial wireless standard ISA100.11a and the M2M terminal supporting the LTE, so that the data logger can be used smoothly in a region where wireless communication is poor.

1 is a block diagram of a remote monitoring system for plant facilities based on IoT for monitoring dynamic measurement data of a plant structure according to the present invention.
2 is a block diagram of an explosion-proof data logger constituting a dynamic measurement data monitoring system of a plant structure according to the present invention.
3 is a block diagram of an input circuit of an A / D converter 220 constituting an explosion-proof data logger according to the present invention.
4 is an example of an amplifier circuit according to the present invention.
5 is an example of an RTC circuit used in an explosion-proof data logger according to the present invention.
FIG. 6 is a graph showing waveforms obtained by changing the temperature between -20 ° C. and 80 ° C. after inserting an explosion-proof data logger according to the present invention into a chamber, and observing performance changes with temperature change.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a remote monitoring system for plant facilities based on IoT for monitoring dynamic measurement data of a plant structure according to the present invention. FIG. 2 is a block diagram of an explosion-proof data logger constituting a dynamic measurement data monitoring system of a plant structure according to the present invention. .

The present invention can monitor the state of a plant structure by collecting and analyzing data obtained by measuring the dynamic state of the plant structure from a sensor as shown in FIG. 1, and it is installed in a pipe rack or a pipe of the plant structure A sensor unit 100 for measuring the strain, a pressure, and a temperature of the plant structure according to acceleration, inclination and stress, respectively, and a sensor unit 100 for measuring acceleration, inclination, Pressure type data logger 200 for converting the strain, pressure and temperature data according to the pressure data and the temperature data into a digital signal and transmitting the measurement data to the gateway unit 300 via USN communication, Is collected through the USN communication module and the collected data is transmitted to the data server unit 400 of the remote place through the wireless communication module A data server unit 400 for receiving sensor data transmitted from the gateway unit 300 and comparing the data with a management reference value and generating an alarm sound in a stepwise manner when the data exceeds the management reference value, And a display unit 500 that displays the sensor data received from the data server unit 400 in a graph and numerical values and allows the manager to confirm measurement data transmitted at predetermined time intervals.

The sensor unit 100 is installed in a pipe rack or a pipe of the plant structure for measuring the state of the plant structure and includes an acceleration sensor for measuring the vibration of the plant structure, a tilt sensor for measuring the tilt of the plant structure, A strain sensor for measuring the strain according to the stress of the plant structure, a pressure sensor for measuring the pressure at the installation position of the plant structure, and a temperature sensor for measuring the temperature of the installation position of the plant structure. One-to-one correspondence with the data logger 200 and, if necessary, the data logger 200 may be built in or separately installed outside the explosion-proof data logger 200.

As shown in FIG. 2, the explosion-proof data logger 200 is an explosion-proof housing having an internal pressure explosion-proof structure installed in a high-risk facility so that even if an internal explosion of the wireless data measurement system occurs, Analog data measured through a sensor of the sensor unit 100 is converted into a voltage value by amplifying the measured analog data and filtering signals not related to noise or the like to perform signal processing An A / D converter 220 for converting the analog data received from the sensor interface 210 into digital data, and an A / D converter 220 for converting the digital signal converted from the A / A wireless communication unit 270 for transmitting the measurement data measured by the sensor unit 100 to a gateway located at a remote location or a remote server located at a remote location; An SD memory unit 240, a controller 230 for controlling the data storage measured by the SD memory unit 240 and displaying sensor data measured and controlled by the wireless communication unit 270 on the LCD module 260, A power supply unit 250 for supplying power to the sensor unit 100, the sensor interface unit 210, the A / D converter 220, the wireless communication unit 270, and the control unit 230, And an RTC unit 280 (Real Time Clock unit) for time synchronization.

The wireless communication unit 270 includes a short distance communication module 273 for communicating with the gate way unit 300 installed near by using the Zigbee or ISA100.11a and the data collected through the USN communication module is Wi- And a remote communication module 275 for transmitting measurement data of a data server unit 400 located at a remote location using a wireless communication network, a Wibro, a 3G communication network, or LTE.

3 is a block diagram of an input circuit of an A / D converter 220 constituting an explosion-proof data logger according to the present invention. The A / D performance according to the present invention is a high-performance A / D converter applicable to the plant using the ADC SAR engine type, the 51 KHz bandwidth is 109 dB SNR, the DC Accuracy is 1.8 uV / Offset Drift and 2 ppm / Respectively.

3 is a circuit diagram of an A / D converter 220 constituting an explosion-proof data logger according to the present invention. The A / D according to the present invention improves the resolution of the sensor input signal by using the analog-to-digital converter IC, and the conversion rate of the ADC is 64Ksps at the maximum, and the best sampling Conditions were satisfied. ADC performance is 109dB SNR at 51KHz bandwidth, DC accuracy is 1.8uV / offset drift, 2ppm / gain drift, and ADC SAR engine type is used.

Between the output terminal of the sensor unit 100 and the A / D converter 220, an amplifying circuit for amplifying the measured analog signal output from the sensor unit 100 is provided. 4 is an example of an amplifier circuit according to the present invention. In order to realize a signal conditioner for high performance measurement, the amplifier uses a Fully Differential Amplifier to minimize noise consumption and minimize power consumption by constructing a low-power differential signal conditioning circuit.

5 is an example of an RTC circuit used in an explosion-proof data logger according to the present invention. The RTC section for synchronizing the time uses a precision RTC (Real Time Clock) IC to transmit the time and data at the time of measurement at the time of sensor data measurement, eliminating the time delay in transmission and solving the synchronization problem in simultaneous analysis with other sensors Respectively.

The reliability test of the explosion-proof data logger according to the present invention was performed at various operating temperatures. Data reliability and performance of explosion-proof data logger were verified by changing the temperature of -20 ℃ ~ 80 ℃ and measuring the change of graph waveform according to the temperature after inserting explosion-proof data logger circuit in the chamber. As shown in FIG. 6, it can be seen that there is no change in the graph waveform indicating that the circuit characteristic varies with the temperature change. Therefore, it can be seen that there is no change in performance according to the temperature change.

In addition, a function generator was connected to an explosion-proof data logger according to the present invention to perform a functional test inspection, thereby performing self-verification of measurement performance and wireless communication performance. As a result of the functional test, it was verified that the data was received and stored in the same manner as the setting sampling (1024 Hz).

We implemented the temperature and pressure sensing function for monitoring while the process is in operation, and realized the temperature and pressure sensing function through the fully differential operational amplifier (FDA) circuit design. In addition, a K, T, R type temperature sensor interface is implemented to realize various types of output and a fully differential operational amplifier with a gain of 50 is used.

In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In addition, the components shown in the embodiments of the present invention are shown independently to represent different characteristic functions, which does not mean that each component is composed of separate hardware or software constituent units. That is, each constituent unit is included in each constituent unit for convenience of explanation, and at least two constituent units of the constituent units may be combined to form one constituent unit, or one constituent unit may be divided into a plurality of constituent units to perform a function. The integrated embodiments and separate embodiments of the components are also included within the scope of the present invention, unless they depart from the essence of the present invention.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

100: sensor unit 200: explosion-proof data logger
210: sensor interface unit 220: A / D converter
230: control unit 240: SD memory unit
250: power supply unit 260: LCD module
270: wireless communication unit 273: short distance communication module
275: Remote communication module 280: RTC part
300: Gateway unit 400: Data server unit
500:

Claims (3)

An IoT-based facility facility remote monitoring system capable of monitoring the state of a plant structure by collecting and analyzing data obtained by measuring the dynamic state of the plant structure from a sensor,
A sensor unit installed in a pipe rack or a pipe of the plant structure to measure a strain, a pressure and a temperature according to vibration, inclination and stress of the plant structure through a sensor;
And a wireless communication unit for converting the strain, pressure and temperature data according to vibration, inclination and stress measured by the sensor unit into digital data, and transmitting the converted digital data at a short distance and at a long distance, A plurality of explosion-proof data loggers,
A gateway unit for collecting data measured by the plurality of explosion-proof data loggers and transmitting the collected data through the wireless communication unit;
A data server unit for receiving each sensor data transmitted from the gateway unit and comparing the data with a management reference value and generating an alarm sound when the data exceeds the management reference value,
And a display unit for displaying sensor data received from the data server unit in a graph and numerical values and for allowing the manager to confirm measurement data transmitted at predetermined time intervals,
The explosion-proof data logger
An explosion-proof housing,
A sensor interface unit for converting analog data measured through a sensor of the sensor unit into a voltage value and for amplifying the measured analog data and filtering and processing a signal irrelevant to a signal such as noise,
An A / D converter for converting the analog data received from the sensor interface unit into digital data;
An SD memory unit for storing measurement data measured by the sensor unit;
A controller for controlling the data transmission of the wireless communication unit and displaying the measured sensor data on the display module and controlling the data storage measured by the SD memory unit;
An RTC unit for measuring a measurement time point when measuring sensor data,
And a power supply unit for supplying power to the sensor interface unit, the A / D converter, the wireless communication unit, the control unit, and the RTC unit using a battery or a commercial power source,
Wherein the sensor unit, the sensor interface unit, the A / D converter, the wireless communication unit, the control unit, the RTC unit, and the power supply unit are installed inside the explosion-proof housing.
The method according to claim 1,
Further comprising an amplifying circuit for amplifying an analog signal output from the sensor unit between an output terminal of the sensor unit and the A / D converter and including a fully differential amplifier.
3. The method according to claim 1 or 2,
Wherein the wireless communication unit is provided with a remote communication module using an ISA100.11a based short-range communication module and an LTE model.

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