JP2015176318A - Wireless type gas detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a gas detection system capable of freely installing a gas detection device, and confirming the leakage position of gas at a management device side on the basis of the gas detection signal of the gas detection device without making it necessary to grasp an installation place in advance at the management device side.SOLUTION: A gas sensor 2 includes position information acquisition means 21 capable of acquiring its own position information i, which is configured to acquire the position information i when detection target gas is detected, and to transmit the position information i and a detection signal S to a management device 3. The management device 3 includes: gas leakage position information storage means 31 for storing gas leakage position information X as the position information of a place where gas leakage tends to occur in a monitoring target area; and gas leakage position estimation means 32 for, when receiving the detection signal S from the gas sensor 2, estimating a place Xe where gas leakage occurs on the basis of the position information i received as well and the gas leakage position information X.

Description

  The present invention relates to a wireless gas detection system including a wireless gas sensor that detects a detection target gas and a management device that receives a detection signal from the gas sensor in a monitoring target area.

  As a device for continuously monitoring the concentration of a detection target gas at a specific location such as a gas plant, a stationary gas detection alarm device that is constantly installed is known. The stationary gas detection device uses a commercial power source as its power source, and is configured to transmit a gas detection signal to the management device via cables.

  The gas detection device having such a configuration requires laying of a cable at the time of installation, and there are many costs in terms of cost and time. In view of such a problem, Patent Document 1 discloses an independently driven wireless gas detection in which a gas detection device includes a wireless communication unit capable of wireless communication with a management device, solar power generation means, and a secondary battery. An apparatus is disclosed.

JP 2004-205425 A

  However, Patent Document 1 does not disclose a mechanism for grasping the installation location of the gas detection device on the management device side. For this reason, for example, when a gas detection signal is received from the gas detection device on the management device side in a gas plant or the like, it is not possible to know where the gas leakage has occurred. For this reason, in order to actually confirm the location of the gas leak, it is necessary for the worker to go directly to the place where the gas detector is installed. In addition, if the gas detection device is configured to be distinguishable on the management device side and the installation location is stored at the time of installation of each gas detection device, if the gas detection device is moved after installation, From the management device side, it is difficult to know the exact installation location of the gas detection device.

  For this reason, in order to accurately grasp the gas leakage location on the management device side with the gas detection device, it is necessary to determine the installation location and use it like the conventional stationary gas detection device. There is a problem that it is unsuitable for use such as confirming a gas leak point at a construction site to be performed in the past.

  Therefore, the object of the present invention is to freely install the gas detection device, and to manage the location of the gas leak based on the gas detection signal of the gas detection device without having to grasp the installation location on the management device side in advance. The object is to realize a gas detection system that can be confirmed on the apparatus side.

In order to achieve the above object, the wireless gas detection system according to the present invention includes a wireless gas sensor that detects a detection target gas and a management device that receives a detection signal from the gas sensor in a monitoring target area. A wireless gas detection system comprising:
The gas sensor is
Provided with location information acquisition means capable of acquiring own location information,
When the detection target gas is detected, the position information acquisition unit acquires its own position information, and the position information and the detection signal are transmitted to the management device,
The management device is
Gas leak position information storage means for storing gas leak position information which is position information of a place where gas leak is likely to occur in the monitoring target area,
When the detection signal is received from the gas sensor, a gas leak position estimation unit is provided that estimates the location where the gas leak has occurred based on the position information received together with the detection signal and the gas leak position information. In the point.

  With the above characteristic configuration, the gas sensor can acquire its own position information, and transmits the position information to the management apparatus when the detection target gas is detected by the management apparatus. For this reason, the management apparatus can grasp the position of the gas sensor when the gas sensor detects the detection target gas. Therefore, the installation location of the gas sensor can be freely changed according to the construction situation, for example, at a construction site. Further, since the gas leakage position information, which is a place where gas leakage is likely to occur, is stored in the management device, for example, based on the position information of the gas sensor and the gas leakage position information, the position information of the gas sensor is the most. The near gas leak position information can be estimated as the place where the gas leak actually occurred. In other words, the gas detection device can be installed freely, and the location of gas leakage can be confirmed on the management device side based on the gas detection signal of the gas detection device without having to know the installation location on the management device side in advance. A gas detection system can be realized.

In addition, the management device
Wind direction acquisition means for acquiring the wind direction in the monitored area;
It is preferable that the gas leak position estimation unit estimates the location where the gas leak has occurred based on the wind direction acquired by the wind direction acquisition unit in addition to the position information and the gas leak position information.

  According to the above characteristic configuration, the gas leak position estimating means can estimate the location where the gas leak has occurred in consideration of the wind direction. Therefore, for example, it is possible to estimate the gas leak location with higher accuracy, such as estimating the gas leak location information closest to the obtained wind direction in the gas sensor location information as the gas leak location. It becomes. That is, it is possible to realize a gas detection system capable of confirming a gas leakage location with higher accuracy on the management device side based on a gas detection signal of the gas detection device.

Furthermore, an imaging means for photographing the inside of the monitoring target area is arranged in the monitoring target area,
The management device is
A photographic image acquisition means for acquiring a photographic image from the imaging means;
When the detection signal is received from the gas sensor, a captured image is acquired from the imaging unit that images the location where the gas leakage estimated by the gas leakage position estimation unit has occurred,
In the photographed image, it is preferable that the location where the gas leak estimated by the gas leak position estimating means is illustrated.

  According to the above characteristic configuration, the location where the gas leak has occurred is illustrated on the captured image including the location where the gas leak has occurred, so that the user of the system can more easily locate the gas leak location on the management device side. Can be confirmed. That is, a more convenient gas detection system can be realized.

Schematic diagram of wireless gas detection system Configuration diagram of wireless gas detection system Reference diagram for explaining the method of estimating the gas leak location by the gas leak position estimation means The figure which shows the display form of the gas leak location in this embodiment

  Hereinafter, a wireless gas detection system 1 according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the wireless gas detection system 1 includes a wireless gas sensor 2 that detects a detection target gas and a management device 3 that receives a detection signal S from the gas sensor 2 in the monitoring target area A. Become. In the present embodiment, an example in which the monitoring target area A is a gas manufacturing factory is shown. The gas sensor 2 is installed to detect a gas leak in the gas plant, and is configured to be able to detect a combustible gas as a detection target gas.

  The gas sensors 2 are arranged at a plurality of locations in the gas manufacturing factory that is the monitoring target area A. Specifically, it is arranged in the vicinity of a gas tank or a place where there is a high possibility of gas leakage such as the vicinity of a connection flange of a pipe connected to the gas tank. The gas sensor 2 is configured to be able to communicate with the gas sensors 2 and the management device 3 using wireless communication. The gas sensor 2 is configured to be able to relay communication from the other gas sensor 2 to the management device 3, and a so-called multi-hop network can be constructed. The gas sensor 2 is configured to communicate with the management device 3 via the network constructed in this way.

  In the present embodiment, a control device provided in the management building in the monitoring target area A is used as the management device 3. The control device includes an arithmetic device and a storage device, and includes a circuit or a program that performs predetermined processing based on the detection signal S acquired from the gas sensor 2. The management device 3 is configured to be able to communicate with the gas sensor 2 by wireless communication. The management device 3 is provided with input / output devices (for example, a keyboard and a display) for the user of the wireless gas detection system 1 to operate, and is configured so that the user can operate the management device 3. Information processed by the device 3 is configured to be visible. Below, the structure of the gas sensor 2 and the management apparatus 3 is demonstrated.

[Configuration of Wireless Gas Detection System 1]
As shown in FIG. 2, the gas sensor 2 includes position information acquisition means 21 that can acquire position information i indicating a location where the gas sensor 2 is currently arranged. In the present embodiment, a GPS (Global Positioning System) is used as the position information acquisition unit 21 and the latitude and longitude can be acquired as the position information i. The gas sensor 2 is configured to acquire its own position information i by the position information acquisition unit 21 and transmit the position information i and the detection signal S to the management device 3 when detecting the detection target gas. In the present embodiment, the detection signal S indicates that the detection target gas has been detected at a predetermined allowable concentration or more. The detection signal S may include an index value indicating the detected concentration of the detection target gas.

  The management device 3 mainly includes a gas leakage position information storage unit 31, a gas leakage position estimation unit 32, and a display unit 33. In the present embodiment, the management device 3 further includes a wind direction acquisition unit 34 that acquires the wind direction W in the monitoring target area A. The wind direction acquisition unit 34 is configured to be able to acquire the current wind direction W at a place where the anemometer is installed from, for example, an anemometer provided in the monitoring target area A. The wind direction acquisition unit 34 may acquire the wind direction W in the monitoring target area A from the outside via the Internet.

  The gas leak position information storage unit 31 is configured to store gas leak position information X that is position information of a place where gas leak is likely to occur in the monitoring target area A. As the gas leakage position information X, for example, position information of a flange connecting part in a pipe connected to a gas tank in the monitoring target area A or a valve connecting part is used.

  When the gas leak position estimation means 32 receives the detection signal S from the gas sensor 2, the gas leak position estimation means 32 determines the location where the gas leak has occurred based on the position information i received together with the detection signal S and the gas leak position information X. presume. Specifically, when receiving the detection signal S and the position information i from the gas sensor 2, the gas leak position estimation means 32 acquires the gas leak position information X correlated with the position information i from the gas leak position information storage means 31. It is estimated that the gas leak position information X is a location where the detection target gas is actually leaking (hereinafter referred to as “gas leak location Xe”). Specifically, for example, the gas leak position information X at the position closest to the position information i (the shortest linear distance) is acquired from the gas leak position information storage unit 31 and is estimated as the gas leak location Xe.

  In the present embodiment, the gas leak position estimation means 32 estimates the gas leak location Xe based on the wind direction W acquired by the wind direction acquisition means 34 in addition to the position information i and the gas leak position information X. Specifically, the gas leakage position information X located closest to the upstream side of the acquired wind direction W with the position information i of the gas sensor 2 as the center is estimated as the gas leakage location Xe.

  A specific example is shown in FIG. FIG. 3 shows a case where the gas sensors 2a to 2c are provided in the monitoring target area A, and the gas leakage position information storage means 31 stores gas leakage position information X1 to X5. In this configuration, when the gas sensor 2 b detects the detection target gas and transmits the detection signal S to the management device 3, the gas leakage position estimation unit 32 first acquires the wind direction W from the wind direction acquisition unit 34. When the wind direction W is downward on the paper surface, the gas leak position information storage unit 31 searches for and acquires the gas leak position information X existing on the upstream side (upward on the paper surface) of the wind direction W of the gas sensor 2b. In this case, the closest gas leakage position information X1 in the upward direction of the paper of the gas sensor 2b is acquired. As described above, the gas leak position information storage unit 31 estimates the gas leak position information X1 as the gas leak position Xe.

  As shown in FIG. 2, the management device 3 includes a display as the display unit 33. When the gas leak location estimating means 32 estimates the gas leak location Xe, information indicating the gas leak location Xe is displayed to the user of the wireless gas detection system 1 via the display means 33. As a display form of information, it is sufficient that the user can perceive the gas leak location Xe. For example, the gas leak location information X (latitude / longitude) indicating the gas leak location Xe is displayed in characters. Alternatively, it is possible to use a form in which a map that covers the monitoring target area A is stored in the management device 3 and the gas leak position information X corresponding to the gas leak location Xe is illustrated with an icon or the like on the map. .

  In the present embodiment, the imaging unit 4 that images the inside of the monitoring target area A is arranged in the monitoring target area A, and the management device 3 uses the captured image of the imaging means 4 to wirelessly detect the gas 1. The gas leak location Xe is displayed in an easy-to-understand manner for the user.

  As the imaging means 4, a monitoring camera provided in the monitoring target area A is used. It is preferable that a plurality of imaging units 4 are arranged in the monitoring target area A and configured to be capable of imaging a range including the gas leakage position information X. The surveillance camera as the imaging means 4 may be either a fixed type or a movable type.

  The management device 3 includes a captured image acquisition unit 35 that acquires the captured image I from the imaging unit 4. More specifically, the captured image acquisition unit 35 selects the imaging unit 4 that captures a range including the gas leakage location Xe when the gas leakage location estimation unit 32 estimates the gas leakage location Xe, A captured image I from the imaging unit 4 is acquired.

  With this configuration, when the management device 3 receives the detection signal S from the gas sensor 2, the management device 3 acquires the captured image I from the imaging unit 4 that captures the gas leakage location Xe estimated by the gas leakage position estimation unit 32. To do. Further, a gas leakage point Xe is illustrated on the captured image I via the display unit 33. FIG. 4 shows an example in the case where the gas leakage portion Xe is illustrated on the photographed image I.

  As described above, the gas sensor 2 can be freely installed, and the gas leak location Xe can be set on the management device 3 side based on the detection signal S of the gas sensor 2 without having to know the installation location on the management device 3 side in advance. The wireless gas detection system 1 that can be confirmed with the above can be realized.

[Another embodiment]
(1) In the above embodiment, an example in which the management device 3 includes the wind direction acquisition unit 34 has been described, but a configuration in which the wind direction acquisition unit 34 is not provided may be employed.

(2) In the above embodiment, an example in which the management device 3 includes the imaging unit 4 has been described. However, a configuration in which the imaging unit 4 is not provided may be employed. In this case, the management device 3 may be configured not to include the captured image acquisition unit 35.

  The present invention can be used as a wireless gas detection system including a wireless gas sensor that detects a detection target gas and a management device that receives a detection signal from the gas sensor in a monitoring target area.

1: wireless gas detection system 2: gas sensor 2a: gas sensor 2b: gas sensor 2c: gas sensor 3: management device 4: imaging means 21: position information acquisition means 31: gas leak position information storage means 32: gas leak position estimation means 34: Wind direction acquisition means 35: Captured image acquisition means A: Monitored area I: Captured image S: Detection signal W: Wind direction X: Gas leakage position information X1: Gas leakage position information X2: Gas leakage position information X3: Gas leakage position information X4 : Gas leak position information Xe: Gas leak location (where gas leak occurred)
i: Location information

Claims (3)

A wireless gas detection system comprising a wireless gas sensor that detects a detection target gas and a management device that receives a detection signal from the gas sensor in a monitoring target area,
The gas sensor is
Provided with location information acquisition means capable of acquiring own location information,
When the detection target gas is detected, the position information acquisition unit acquires its own position information, and the position information and the detection signal are transmitted to the management device,
The management device is
Gas leak position information storage means for storing gas leak position information which is position information of a place where gas leak is likely to occur in the monitoring target area,
When the detection signal is received from the gas sensor, a gas leak position estimation unit is provided that estimates the location where the gas leak has occurred based on the position information received together with the detection signal and the gas leak position information. Wireless gas detection system. The management device is
Wind direction acquisition means for acquiring the wind direction in the monitored area;
2. The wireless gas according to claim 1, wherein the gas leak position estimation unit estimates a location where a gas leak has occurred based on the wind direction acquired by the wind direction acquisition unit in addition to the position information and the gas leak position information. Detection system. In the monitoring target area, imaging means for photographing the monitoring target area is arranged,
The management device is
A photographic image acquisition means for acquiring a photographic image from the imaging means;
When the detection signal is received from the gas sensor, a captured image is acquired from the imaging unit that images the location where the gas leakage estimated by the gas leakage position estimation unit has occurred,
3. The wireless gas detection system according to claim 1, wherein in the photographed image, a place where the gas leakage estimated by the gas leakage position estimation unit is generated is illustrated.

Images