CN116537881A - Fire monitoring and early warning method and system for mine goaf - Google Patents
Fire monitoring and early warning method and system for mine goaf Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 163
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
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- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention provides a mine goaf fire monitoring and early warning method and an early warning system, wherein the mine goaf fire monitoring and early warning method comprises the following steps: dividing a goaf into a plurality of monitoring areas, collecting real-time temperature signals of the monitoring areas, and determining a target area with fire risk in the monitoring areas; (II) collecting the gas concentration in the target area and determining the ignition point; (iii) acquiring image information at the fire point, extracting the flame spread speed to determine the alarm level. The invention implements modularized monitoring management, is beneficial to accurately grasping the fire scene, and can quickly and accurately obtain the alarm level and carry out graded alarm.
Description
Technical Field
The invention belongs to the technical field of coal mine fire safety, and relates to a mine goaf fire monitoring and early warning method and an early warning system.
Background
In case of fire disaster, the mine can burn out a large amount of equipment and coal resources, so that the loss is brought to production, the attached high-temperature smoke flow and harmful gas can cause great damage to the environment, the lives of underground workers can be endangered, and additional disasters such as gas and coal dust explosion are extremely easy to cause, so that the harm is extremely great. The defects of fire safety wind direction awareness and countermeasures in a mine goaf lead to frequent fire accidents, effectively reduce waiting rescue time of underground miners, improve autonomous escape and emergency rescue efficiency, avoid casualties caused by secondary disasters after occurrence of mining accidents, and become a primary problem for reducing casualties of personnel in major mining accident. The underground environment contains inflammable and explosive gas, and is extremely easy to cause serious fire or explosion due to the firing in a small range, so that the coal in the goaf of the coal mine needs to be subjected to fire monitoring and early warning.
At present, the method for monitoring coal fire in the goaf by the coal mine mainly monitors the temperature and gas in the area where the fire possibly occurs in the goaf by a monitoring center and an underground monitoring device which are arranged on the ground. However, the sensor relied on by the disaster sensing device is affected by various factors such as severe underground environment, different geological occurrence conditions of coal, sensitivity and service life of the sensor, so that the prior coal mine fire early warning system has higher false alarm rate and false alarm rate, and can not perform early fire early warning. In addition, the sensor can only monitor the installation position or the surrounding small range, and the large-area monitoring of the disaster under the mine is difficult to realize.
Therefore, the monitoring method capable of realizing early fire early warning is provided, disaster sources are positioned and tracked, and the occurrence of the fire is found in time to make corresponding early warning, so that the method is very important for coal mine safety production.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a mine goaf fire monitoring and early warning method and system, which implement modularized monitoring and management, are favorable for accurately grasping a fire scene, can quickly and accurately obtain an alarm grade and carry out graded alarm.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a mine goaf fire monitoring and early warning method, which comprises the following steps:
dividing a goaf into a plurality of monitoring areas, collecting real-time temperature signals of the monitoring areas, and determining a target area with fire risk in the monitoring areas;
(II) collecting the gas concentration in the target area and determining the ignition point;
(iii) acquiring image information at the fire point, extracting the flame spread speed to determine the alarm level.
According to the mine goaf fire monitoring and early warning method provided by the invention, the goaf is divided into the monitoring areas, modularized monitoring management is implemented, accurate grasping of a fire scene is facilitated, the working efficiency is improved, the fire is detected early by detecting the temperature signals in each area to obtain a target area, and the fire deficiency and excess can be identified by combining the gas concentration in the detection environment, so that the fire starting point is determined, accurate positioning is realized, and the risk of false alarm or missing alarm is reduced; based on visual image recognition, real-time monitoring is performed, flame spreading speed is confirmed by utilizing dynamic flame state information, underground fire hazard degree is estimated, alarm grades can be rapidly and accurately obtained, grading alarm is performed, and the method has the advantages of being high in accuracy and strong in adaptability.
As a preferred embodiment of the present invention, in the step (i), the dividing of the monitoring area includes: dividing the goaf into at least two equidistant monitoring areas along the length direction of the goaf, and numbering the monitoring areas.
In the invention, the monitoring areas are numbered, so that the position of the target area can be obtained rapidly when the fire disaster situation is identified, and a foundation is provided for starting an emergency scheme.
As a preferred embodiment of the present invention, in the step (i), the determining of the target area includes:
s101, setting a temperature threshold and an interval threshold;
s102, acquiring a real-time thermal imaging image in a monitoring area, extracting the temperature of a high-temperature center in the real-time thermal imaging image, recording the temperature as a real-time temperature, comparing the real-time temperature with a temperature threshold, outputting a first early warning signal when the real-time temperature is higher than the temperature threshold, and recording an output time point;
s103, when the duration of outputting the first early warning signal reaches the interval threshold value, judging that fire risks exist in the monitoring area, and obtaining a target area; and when the duration of the first early warning signal is smaller than the interval threshold value, determining that false flames exist in the monitoring area.
It should be noted that, the thermal imaging image in each detection unit in the invention can cover the whole monitoring area, when the real-time temperature is detected to be higher than the temperature threshold, and the first early warning signal continuously responds within the preset interval threshold, the fire risk in the monitoring area is judged to be present, and the target area is obtained; otherwise, stopping responding the first early warning signal within a preset interval threshold value, and judging that false flames exist in the monitoring area and are not the target area. According to the thermal imaging image, the number of monitoring areas with fire risks in the goaf can be 1 or more than 1.
As a preferred embodiment of the present invention, in the step (i), the determining of the target area includes:
s111, distributing distributed temperature sensing optical fibers in the monitoring areas, so that the temperature sensing optical fibers in each monitoring area are symmetrically distributed by taking the central line of the monitoring area as an axis, and two adjacent temperature sensing optical fibers are equidistantly arranged;
s112, setting a temperature threshold;
s113, adopting a temperature sensing optical fiber to independently collect real-time temperature in a monitoring area, comparing the real-time temperature with a temperature threshold, and identifying and marking the temperature sensing optical fiber when the real-time temperature is higher than the temperature threshold;
s114, obtaining a target area according to the area covered by the identification mark.
In the invention, uniformly distributed temperature sensing optical fibers can be paved in each monitoring area to monitor the temperature, so that the full coverage of the goaf is realized, when the temperature abnormality in the monitoring area is detected (exceeding the preset temperature threshold), the goaf can be positioned to the position of a specific temperature sensing optical cable through a specific identification mark, and a temperature abnormality surface is formed according to the number of the temperature sensing optical fibers with the detected abnormality, so that the target area is obtained.
As a preferred embodiment of the present invention, in the step (ii), the determining of the ignition point includes: laser concentration detection is performed on a plurality of gases within the target area environment.
Preferably, the gas comprises CO 2 、CH 4 CO and O 2 At least two of them.
Preferably, the laser concentration detection specifically includes the following steps:
s201, setting a concentration threshold value, and determining an initial angle, switching times and a preset angle of a laser source according to a target area;
s202, driving a laser source to emit laser at an initial angle, and collecting real-time concentrations of various gases in the environment;
s203, comparing the real-time concentration with a concentration threshold, directly executing the step S204 when the real-time concentration is smaller than the concentration threshold, outputting a second early warning signal when the real-time concentration is larger than or equal to the concentration threshold, recording an output site, and executing the step S204;
s204, switching the emission angle of the laser source to a preset angle, driving the laser source to emit laser, collecting the real-time concentration of various gases in the environment, and repeatedly executing S203 until the detection of the switching times is completed;
s205, positioning the ignition point according to the recorded covering sites for outputting the second early warning signal initially and outputting the second early warning signal finally.
The method comprises the steps of determining the initial angle of the emission of the laser source according to the position of the target area, obtaining the switching times and the preset angle based on the area of the target area, driving the laser source to perform angle switching at the preset angle each time, and sequentially detecting various gas concentrations in the environment to realize the whole coverage of the target area and avoid the risk of missing report. In the gas concentration detection process, recording the output sites of each second early warning signal, and extracting the detection surface between the first output site and the last output site, namely the accurate position of the ignition point.
Preferably, the preset angle is 5 to 45 °, for example, 5 °, 8 °, 10 °, 15 °, 20 °, 25 °, 30 °, 32 °, 35 °, 40 °, or 45 °, but the preset angle is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
As a preferred embodiment of the present invention, in the step (iii), the determining of the alarm level specifically includes the following steps:
s301, setting an experience threshold;
s302, acquiring a video image of a fire point, and acquiring a real-time image of a flame target;
s303, processing the real-time image, and obtaining the flame area of the flame target by adopting edge analysis and calculation;
s304, comparing the change quantity of the flame areas of the front and rear frame field images to obtain the flame spreading speed, comparing the flame spreading speed with an experience threshold value, and outputting a hazard degree grading alarm signal.
The method extracts flame areas from the real-time images of the flame targets, determines flame spreading speed by comparing whether the flame areas of the front frame image and the rear frame image are increased, can also obtain the flame spreading direction, compares the real-time flame spreading speed obtained by detection with an empirical threshold value, determines dangerous grades, and starts a corresponding emergency scheme by grading alarm signals.
In a second aspect, the invention provides a mine goaf fire monitoring and early warning device, which is used for the mine goaf fire monitoring and early warning method in the first aspect, and comprises a control unit and a plurality of detection units, wherein the detection units are in one-to-one correspondence with the monitoring areas;
the detection unit comprises a temperature detection module, a concentration detection module and a visual monitoring module, wherein the temperature detection module is used for detecting a temperature signal in the monitoring unit, the concentration detection module is used for collecting a gas concentration signal in the environment of a target area, and the visual monitoring module is used for acquiring image information at a fire point;
the control unit is electrically connected with the temperature detection module, the concentration detection module and the visual monitoring module respectively and is used for receiving and analyzing the temperature signals, the gas concentration signals and the image information so as to respectively determine a target area, a fire point and an alarm level and send out an alarm.
According to the mine goaf fire monitoring and early warning device provided by the invention, whether the temperature abnormality occurs in the goaf is detected by the temperature detection module, the concentration of the gas in the environment is detected by the concentration detection module, so that the flame is virtual and real, accurate positioning is performed, the visual monitoring module is adopted to grasp the flame dynamic change, the alarm grade can be rapidly and accurately obtained, and the grading alarm is performed, so that the emergency scheme is started.
As a preferable technical scheme of the invention, the control unit comprises a downhole switching device, a central switching device, an information processing service device and an alarm device.
The underground exchange device is respectively and electrically connected with the detection unit and the central exchange device and is used for receiving and exchanging data signals; the central exchange device is electrically connected with the information processing service device, and the information processing service device is used for receiving and analyzing the temperature signal, the gas concentration signal and the image information, and controlling the alarm device to output an alarm signal through feedback of an analysis result.
The control unit of the invention is used as a terminal for operation and monitoring of operation and maintenance personnel in the underground coal mine, and comprises a central exchange device arranged on the underground coal mine, and an underground exchange device arranged in the underground coal mine, and a complete communication network is established in the whole inspection area, so that bidirectional data interaction is realized.
As a preferable technical scheme of the invention, the concentration detection module comprises a laser detection device and an angle adjustment device, wherein the laser detection device is used for detecting the concentration of various gases in a monitoring area, and the angle adjustment device is used for switching the deflection angle of laser emitted by the laser detection device.
Preferably, the laser detection device comprises a laser generator, a laser controller, a laser receiver, a photoelectric detector and a collimator, wherein the laser generator comprises a plurality of laser sources, the laser generator is connected with the collimator and is used for emitting laser into open air, the laser receiver is used for receiving reflected laser, the photoelectric detector is used for converting received laser signals into electric signals, and the laser controller is used for processing the electric signals and obtaining a plurality of gas concentrations.
Preferably, the angle adjusting device comprises an angle controller, the angle controller is respectively and electrically connected with the control unit, the laser generator and the laser receiver, and the angle controller is used for driving the laser generator and the laser receiver to switch the angle.
As a preferred technical scheme of the invention, the visual monitoring module comprises a CCD (Charge Coupled Device ) camera and a management module which are electrically connected, wherein the CCD camera is used for shooting a real-time image at a fire point and transmitting the real-time image to the management module, and the management module is used for analyzing and processing the real-time image.
Preferably, the temperature detection module comprises an infrared thermal imaging device and a resolution module, wherein the infrared thermal imaging device is used for acquiring thermal imaging images in the monitoring area, and the resolution module is used for analyzing and processing the thermal imaging images.
Preferably, the temperature detection module comprises distributed temperature sensing optical fibers, the distributed temperature sensing optical fibers are laid in the monitoring area, the distributed temperature sensing optical fibers comprise a plurality of temperature sensing optical fibers, the temperature sensing optical fibers in each monitoring area are symmetrically distributed by taking the central line of the monitoring area as an axis, and two adjacent temperature sensing optical fibers are equidistantly arranged.
The system refers to an equipment system, a device system or a production device.
Compared with the prior art, the invention has the beneficial effects that:
according to the mine goaf fire monitoring and early warning method and system, the goaf is divided into the monitoring areas, modularized monitoring management is implemented, accurate grasping of a fire scene is facilitated, working efficiency is improved, early detection of fire is carried out by detecting temperature signals in all areas to obtain a target area, and the gas concentration in a detection environment is combined, so that fire deficiency and excess can be identified, a fire starting point is determined, accurate positioning is achieved, and the risk of false alarm or missing alarm is reduced; based on visual image recognition, real-time monitoring is performed, flame spreading speed is confirmed by utilizing dynamic flame state information, underground fire hazard degree is estimated, alarm grades can be rapidly and accurately obtained, grading alarm is performed, and the method has the advantages of being high in accuracy and strong in adaptability.
Drawings
FIG. 1 is a flow chart of target region determination by acquiring a thermographic image in a goaf in accordance with one embodiment of the present invention;
FIG. 2 is a flow chart of determining a target area by laying distributed temperature sensing optical fibers in a goaf according to an embodiment of the present invention;
FIG. 3 is a flow chart of a laser concentration detection method according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for determining an alert level according to one embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fire monitoring and early warning device for a goaf of a mine according to an embodiment of the present invention.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
In a specific embodiment, the invention provides a mine goaf fire monitoring and early warning method, which comprises the following steps:
(1) Dividing the goaf into a plurality of monitoring areas, collecting real-time temperature signals of the monitoring areas, and determining a target area with fire risk in the monitoring areas;
(2) Collecting the gas concentration in a target area and determining a fire point;
(3) Image information at the fire point is acquired, and the flame spread rate is extracted to determine the alarm level.
According to the mine goaf fire monitoring and early warning method provided by the invention, the goaf is divided into monitoring areas, modularized monitoring management is implemented, fire early detection is carried out by detecting temperature signals in all areas, a target area is obtained, and the fire deficiency and excess can be identified by combining the gas concentration in the detection environment, so that the fire starting point is determined, and accurate positioning is realized; based on visual image recognition, real-time monitoring is performed, and flame spreading speed can be confirmed by utilizing dynamic flame state information, so that underground fire hazard degree is estimated.
In some embodiments, in step (1), the dividing of the monitoring area includes: dividing the goaf into at least two equidistant monitoring areas along the length direction of the goaf, and numbering the monitoring areas. According to the invention, the monitoring areas are numbered, so that the position of the target area can be obtained rapidly when the fire disaster situation is identified, and a foundation is provided for starting an emergency scheme.
In some embodiments, in step (1), the determination of the target area may be determined by acquiring a thermal imaging image in the goaf, as shown in fig. 1, and specifically includes the following steps:
s101, setting a temperature threshold and an interval threshold;
s102, acquiring a real-time thermal imaging image in a monitoring area, extracting the temperature of a high-temperature center in the real-time thermal imaging image, recording the temperature as a real-time temperature, comparing the real-time temperature with a temperature threshold, outputting a first early warning signal when the real-time temperature is higher than the temperature threshold, and recording an output time point;
s103, when the duration of outputting the first early warning signal reaches the interval threshold value, judging that fire risks exist in the monitoring area, and obtaining a target area; and when the duration of the first early warning signal is smaller than the interval threshold value, determining that false flames exist in the monitoring area.
The thermal imaging image in each detection unit can cover the whole monitoring area, and when the real-time temperature is detected to be higher than the temperature threshold value and within a preset interval threshold value, the first early warning signal continuously responds to judge that the fire risk exists in the monitoring area, namely a target area is obtained; otherwise, stopping responding the first early warning signal within a preset interval threshold value, and judging that false flames exist in the monitoring area and are not the target area. And according to the thermal imaging image, the monitoring area with fire risk in the goaf can be 1 or more than 1.
In some embodiments, in step (1), the target area may be further determined by laying a distributed temperature sensing optical fiber in the goaf, as shown in fig. 2, and specifically includes the following steps:
s111, distributing distributed temperature sensing optical fibers in the monitoring areas, so that the temperature sensing optical fibers in each monitoring area are symmetrically distributed by taking the central line of the monitoring area as an axis, and two adjacent temperature sensing optical fibers are equidistantly arranged;
s112, setting a temperature threshold;
s113, adopting a temperature sensing optical fiber to independently collect real-time temperature in a monitoring area, comparing the real-time temperature with a temperature threshold, and identifying and marking the temperature sensing optical fiber when the real-time temperature is higher than the temperature threshold;
s114, obtaining a target area according to the area covered by the identification mark.
According to the invention, the temperature monitoring can be carried out by paving the uniformly distributed temperature sensing optical fibers in each monitoring area, so that the full coverage of the goaf is realized, when the temperature abnormality in the monitoring area is detected (exceeding the preset temperature threshold), the temperature abnormality can be positioned to the position of a specific temperature sensing optical cable through a specific identification mark, and a temperature abnormality surface is formed according to the number of the detected abnormal temperature sensing optical fibers, so that the target area is obtained.
In some embodiments, in step (2), the determination of the ignition point comprises: laser concentration detection is performed on a plurality of gases within the target area environment. The gas comprises CO 2 、CH 4 CO and O 2 At least two of them.
In some embodiments, as shown in fig. 3, the laser concentration detection specifically includes the following steps:
s201, setting a concentration threshold value, and determining an initial angle, switching times and a preset angle of a laser source according to a target area;
s202, driving a laser source to emit laser at an initial angle, and collecting real-time concentrations of various gases in the environment;
s203, comparing the real-time concentration with a concentration threshold, directly executing the step S204 when the real-time concentration is smaller than the concentration threshold, outputting a second early warning signal when the real-time concentration is larger than or equal to the concentration threshold, recording an output site, and executing the step S204;
s204, switching the emission angle of the laser source to a preset angle, driving the laser source to emit laser, collecting the real-time concentration of various gases in the environment, and repeatedly executing S203 until the detection of the switching times is completed;
s205, positioning the ignition point according to the recorded covering sites for outputting the second early warning signal initially and outputting the second early warning signal finally.
According to the method, the initial angle of the emission of the laser source is determined according to the position of the target area, the switching times and the preset angle are obtained based on the area of the target area, the laser source is driven to switch angles at preset angles each time, and the concentration of various gases in the environment is detected sequentially, so that the whole coverage of the target area is realized, and the risk of missing report is avoided. In the gas concentration detection process, recording the output sites of each second early warning signal, and extracting the detection surface between the first output site and the last output site, namely the accurate position of the ignition point. The preset angle is 5-45 degrees.
In some embodiments, in step (3), as shown in fig. 4, the determining of the alarm level specifically includes the following steps:
s301, setting an experience threshold;
s302, acquiring a video image of a fire point, and acquiring a real-time image of a flame target;
s303, processing the real-time image, and obtaining the flame area of the flame target by adopting edge analysis and calculation;
s304, comparing the change quantity of the flame areas of the front and rear frame field images to obtain the flame spreading speed, comparing the flame spreading speed with an experience threshold value, and outputting a hazard degree grading alarm signal.
According to the invention, the flame area is extracted from the real-time image of the flame target, the flame spreading speed is determined by comparing whether the flame area of the front frame image and the rear frame image is increased, the flame spreading direction can be obtained, the real-time flame spreading speed obtained by detection is compared with an empirical threshold value, the dangerous grade is determined, and a corresponding emergency scheme is started by grading an alarm signal.
In another specific embodiment, the invention provides a mine goaf fire monitoring and early warning device, which is used for the mine goaf fire monitoring and early warning method in one specific embodiment, and comprises a control unit and a plurality of detection units, wherein the detection units are in one-to-one correspondence with the monitoring areas; the detection unit comprises a temperature detection module, a concentration detection module and a visual monitoring module, wherein the temperature detection module is used for detecting a temperature signal in the monitoring unit, the concentration detection module is used for collecting a gas concentration signal in the environment of a target area, and the visual monitoring module is used for acquiring image information at a fire point; the control unit is electrically connected with the temperature detection module, the concentration detection module and the visual monitoring module respectively and is used for receiving and analyzing the temperature signals, the gas concentration signals and the image information so as to respectively determine a target area, a fire point and an alarm level and send out an alarm.
According to the mine goaf fire monitoring and early warning device provided by the invention, whether the temperature abnormality occurs in the goaf is detected by the temperature detection module, the concentration of the gas in the environment is detected by the concentration detection module, so that the flame is virtual and real, accurate positioning is performed, the visual monitoring module is adopted to grasp the flame dynamic change, the alarm grade can be rapidly and accurately obtained, and the grading alarm is performed, so that the emergency scheme is started.
As shown in fig. 5, the control unit includes a downhole switching device, a central switching device, an information processing service device, and an alarm device. The underground exchange device is respectively and electrically connected with the detection unit and the central exchange device and is used for receiving and exchanging data signals; the central exchange device is electrically connected with the information processing service device, and the information processing service device is used for receiving and analyzing the temperature signal, the gas concentration signal and the image information, and controlling the alarm device to output an alarm signal through feedback of an analysis result. The control unit of the invention is used as a terminal for operation and monitoring of operation and maintenance personnel in the underground coal mine, and comprises a central exchange device arranged on the underground coal mine, and an underground exchange device arranged in the underground coal mine, and a complete communication network is established in the whole inspection area, so that bidirectional data interaction is realized. The detection unit of each monitoring area independently transmits various acquired data signals to the underground exchange device; the underground exchange device transmits the transmitted monitoring data to a central exchange device on the well; the central exchange device transmits the data to the information processing service device, the information processing server stores the data of each sensor, analyzes the data change, and feeds back and controls the alarm device to send out an alarm signal according to the analysis result.
The temperature detection module comprises an infrared thermal imaging device and an analysis module, wherein the infrared thermal imaging device is used for acquiring thermal imaging images in a monitoring area, and the analysis module is used for analyzing and processing the thermal imaging images. In the invention, each monitoring area is internally provided with an infrared thermal imaging device which corresponds to the number of the monitoring area, the infrared thermal imaging devices are respectively provided with a first exclusive number, in the monitoring process, the infrared thermal imaging devices can adopt a normally open mode, and the control unit can obtain the corresponding first exclusive number while acquiring the thermal imaging image.
The concentration detection module comprises a laser detection device and an angle adjustment device, wherein the laser detection device is used for detecting the concentration of various gases in a monitoring area, and the angle adjustment device is used for switching the deflection angle of laser emitted by the laser detection device. The laser detection device comprises a laser generator, a laser controller, a laser receiver, a photoelectric detector and a collimator, wherein the laser generator comprises a plurality of laser sources, the laser sources can adopt tunable semiconductor lasers, and can emit laser with a plurality of wavelengths for measuring different gas concentrations. The laser generator is connected with the collimator and used for emitting laser into open air, the laser receiver is used for receiving reflected laser, the photoelectric detector is used for converting received laser signals into electric signals, the laser controller is used for processing the electric signals and obtaining various gas concentrations under different angles, and data are transmitted to the control unit through the communication interface. The angle adjusting device comprises an angle controller, wherein the angle controller is respectively and electrically connected with the control unit, the laser generator and the laser receiver, and the angle controller is used for driving the laser generator and the laser receiver to switch the angle.
The visual monitoring module comprises a CCD camera and a management module which are electrically connected, wherein the CCD camera is used for shooting a real-time image at a fire point and transmitting the real-time image to the management module, and the management module is used for analyzing and processing the real-time image. In the invention, each monitoring area is provided with a CCD camera and a number corresponding to the monitoring area, the CCD cameras are respectively provided with a second exclusive number, and in the monitoring process, the control unit feeds back and controls the CCD cameras with the corresponding second exclusive numbers to be started according to the position of the fire starting point, and the real-time images are acquired and uploaded to the management module so as to obtain the dynamic change of the flame target.
In another specific embodiment, the invention provides a mine goaf fire monitoring and early warning device, which is used for the mine goaf fire monitoring and early warning method in one specific embodiment, and comprises a control unit and a plurality of detection units, wherein the detection units are in one-to-one correspondence with the monitoring areas;
the detection unit comprises a temperature detection module, a concentration detection module and a visual monitoring module, wherein the temperature detection module is used for detecting a temperature signal in the monitoring unit, the concentration detection module is used for collecting a gas concentration signal in the environment of a target area, and the visual monitoring module is used for acquiring image information at a fire point;
the control unit is electrically connected with the temperature detection module, the concentration detection module and the visual monitoring module respectively and is used for receiving and analyzing the temperature signals, the gas concentration signals and the image information so as to respectively determine a target area, a fire point and an alarm level and send out an alarm.
According to the mine goaf fire monitoring and early warning device provided by the invention, whether the temperature abnormality occurs in the goaf is detected by the temperature detection module, the concentration of the gas in the environment is detected by the concentration detection module, so that the flame is virtual and real, accurate positioning is performed, the visual monitoring module is adopted to grasp the flame dynamic change, the alarm grade can be rapidly and accurately obtained, and the grading alarm is performed, so that the emergency scheme is started.
The control unit comprises an underground exchange device, a central exchange device, an information processing service device and an alarm device. The underground exchange device is respectively and electrically connected with the detection unit and the central exchange device and is used for receiving and exchanging data signals; the central exchange device is electrically connected with the information processing service device, and the information processing service device is used for receiving and analyzing the temperature signal, the gas concentration signal and the image information, and controlling the alarm device to output an alarm signal through feedback of an analysis result. The control unit of the invention is used as a terminal for operation and monitoring of operation and maintenance personnel in the underground coal mine, and comprises a central exchange device arranged on the underground coal mine, and an underground exchange device arranged in the underground coal mine, and a complete communication network is established in the whole inspection area, so that bidirectional data interaction is realized. The detection unit of each monitoring area independently transmits various acquired data signals to the underground exchange device; the underground exchange device transmits the transmitted monitoring data to a central exchange device on the well; the central exchange device transmits the data to the information processing service device, the information processing server stores the data of each sensor, analyzes the data change, and feeds back and controls the alarm device to send out an alarm signal according to the analysis result.
The temperature detection module comprises distributed temperature sensing optical fibers, the distributed temperature sensing optical fibers are laid in the monitoring area, each distributed temperature sensing optical fiber comprises a plurality of temperature sensing optical fibers, the temperature sensing optical fibers in each monitoring area are symmetrically distributed by taking the central line of the monitoring area as an axis, and two adjacent temperature sensing optical fibers are equidistantly arranged. The temperature-sensing optical fiber has the advantages of water resistance, good tensile resistance and compression resistance, convenient installation and maintenance, corrosion resistance and capability of accurately finding out the ignition source within 1.5 m interval.
The concentration detection module comprises a laser detection device and an angle adjustment device, wherein the laser detection device is used for detecting the concentration of various gases in a monitoring area, and the angle adjustment device is used for switching the deflection angle of laser emitted by the laser detection device. The laser detection device comprises a laser generator, a laser controller, a laser receiver, a photoelectric detector and a collimator, wherein the laser generator comprises a plurality of laser sources, the laser sources can adopt tunable semiconductor lasers, and can emit laser with a plurality of wavelengths for measuring different gas concentrations. The laser generator is connected with the collimator and used for emitting laser into open air, the laser receiver is used for receiving reflected laser, the photoelectric detector is used for converting received laser signals into electric signals, the laser controller is used for processing the electric signals and obtaining various gas concentrations under different angles, and data are transmitted to the control unit through the communication interface. The angle adjusting device comprises an angle controller, wherein the angle controller is respectively and electrically connected with the control unit, the laser generator and the laser receiver, and the angle controller is used for driving the laser generator and the laser receiver to switch the angle.
The visual monitoring module comprises a CCD camera and a management module which are electrically connected, wherein the CCD camera is used for shooting real-time images at a fire point and transmitting the real-time images to the management module, and the management module is used for analyzing, processing and storing the real-time images. In the invention, each monitoring area is provided with a CCD camera and a number corresponding to the monitoring area, the CCD cameras are respectively provided with a second exclusive number, and in the monitoring process, the control unit feeds back and controls the CCD cameras with the corresponding second exclusive numbers to be started according to the position of the fire starting point, and the real-time images are acquired and uploaded to the management module so as to obtain the dynamic change of the flame target. The CCD camera is provided with a network cable, a long-line transmission interface and an optical fiber interface, supports point-to-point and point-to-multipoint data transmission, has no division of master nodes and slave nodes, and meets the possible underground optical fiber, flame-retardant network cable and power carrier long-line transmission access modes.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (10)
1. The mine goaf fire monitoring and early warning method is characterized by comprising the following steps of:
dividing a goaf into a plurality of monitoring areas, collecting real-time temperature signals of the monitoring areas, and determining a target area with fire risk in the monitoring areas;
(II) collecting the gas concentration in the target area and determining the ignition point;
(iii) acquiring image information at the fire point, extracting the flame spread speed to determine the alarm level.
2. The mine goaf fire monitoring and early warning method of claim 1, wherein in the step (i), the dividing of the monitoring area comprises: dividing the goaf into at least two equidistant monitoring areas along the length direction of the goaf, and numbering the monitoring areas.
3. The mine goaf fire monitoring and early warning method as claimed in claim 1 or 2, wherein in the step (i), the determination of the target area includes:
s101, setting a temperature threshold and an interval threshold;
s102, acquiring a real-time thermal imaging image in a monitoring area, extracting the temperature of a high-temperature center in the real-time thermal imaging image, recording the temperature as a real-time temperature, comparing the real-time temperature with a temperature threshold, outputting a first early warning signal when the real-time temperature is higher than the temperature threshold, and recording an output time point;
s103, when the duration of outputting the first early warning signal reaches the interval threshold value, judging that fire risks exist in the monitoring area, and obtaining a target area; and when the duration of the first early warning signal is smaller than the interval threshold value, determining that false flames exist in the monitoring area.
4. The mine goaf fire monitoring and early warning method as claimed in claim 1 or 2, wherein in the step (i), the determination of the target area includes:
s111, distributing distributed temperature sensing optical fibers in the monitoring areas, so that the temperature sensing optical fibers in each monitoring area are symmetrically distributed by taking the central line of the monitoring area as an axis, and two adjacent temperature sensing optical fibers are equidistantly arranged;
s112, setting a temperature threshold;
s113, adopting a temperature sensing optical fiber to independently collect real-time temperature in a monitoring area, comparing the real-time temperature with a temperature threshold, and identifying and marking the temperature sensing optical fiber when the real-time temperature is higher than the temperature threshold;
s114, obtaining a target area according to the area covered by the identification mark.
5. The mine goaf fire monitoring and early warning method of any one of claims 1-4, wherein in step (ii), the determination of the ignition point comprises: performing laser concentration detection on a plurality of gases in the target area environment;
preferably, the gas comprises CO 2 、CH 4 CO and O 2 At least two of (a) and (b);
preferably, the laser concentration detection specifically includes the following steps:
s201, setting a concentration threshold value, and determining an initial angle, switching times and a preset angle of a laser source according to a target area;
s202, driving a laser source to emit laser at an initial angle, and collecting real-time concentrations of various gases in the environment;
s203, comparing the real-time concentration with a concentration threshold, directly executing the step S204 when the real-time concentration is smaller than the concentration threshold, outputting a second early warning signal when the real-time concentration is larger than or equal to the concentration threshold, recording an output site, and executing the step S204;
s204, switching the emission angle of the laser source to a preset angle, driving the laser source to emit laser, collecting the real-time concentration of various gases in the environment, and repeatedly executing S203 until the detection of the switching times is completed;
s205, positioning the ignition point according to the recorded covering sites for outputting the second early warning signal initially and outputting the second early warning signal finally;
preferably, the preset angle is 5-45 °.
6. The mine goaf fire monitoring and early warning method as claimed in any one of claims 1 to 5, wherein in the step (iii), the determining of the alarm level specifically includes the steps of:
s301, setting an experience threshold;
s302, acquiring a video image of a fire point, and acquiring a real-time image of a flame target;
s303, processing the real-time image, and obtaining the flame area of the flame target by adopting edge analysis and calculation;
s304, comparing the change quantity of the flame areas of the front and rear frame field images to obtain the flame spreading speed, comparing the flame spreading speed with an experience threshold value, and outputting a hazard degree grading alarm signal.
7. The mine goaf fire monitoring and early warning device is characterized by being used for the mine goaf fire monitoring and early warning method according to any one of claims 1-6, and comprises a control unit and a plurality of detection units, wherein the detection units are in one-to-one correspondence with the monitoring areas;
the detection unit comprises a temperature detection module, a concentration detection module and a visual monitoring module, wherein the temperature detection module is used for detecting a temperature signal in the monitoring unit, the concentration detection module is used for collecting a gas concentration signal in the environment of a target area, and the visual monitoring module is used for acquiring image information at a fire point;
the control unit is electrically connected with the temperature detection module, the concentration detection module and the visual monitoring module respectively and is used for receiving and analyzing the temperature signals, the gas concentration signals and the image information so as to respectively determine a target area, a fire point and an alarm level and send out an alarm.
8. The mine goaf fire monitoring and early warning device according to claim 7, wherein the control unit comprises a downhole switching device, a central switching device, an information processing service device and an alarm device;
the underground exchange device is respectively and electrically connected with the detection unit and the central exchange device and is used for receiving and exchanging data signals; the central exchange device is electrically connected with the information processing service device, and the information processing service device is used for receiving and analyzing the temperature signal, the gas concentration signal and the image information, and controlling the alarm device to output an alarm signal through feedback of an analysis result.
9. The mine goaf fire monitoring and early warning device according to claim 7 or 8, wherein the concentration detection module comprises a laser detection device and an angle adjustment device, the laser detection device is used for detecting various gas concentrations in a monitoring area, and the angle adjustment device is used for switching the deflection angle of laser emitted by the laser detection device;
preferably, the laser detection device comprises a laser generator, a laser controller, a laser receiver, a photoelectric detector and a collimator, wherein the laser generator comprises a plurality of laser sources, the laser generator is connected with the collimator and is used for emitting laser into open air, the laser receiver is used for receiving reflected laser, the photoelectric detector is used for converting received laser signals into electric signals, and the laser controller is used for processing the electric signals and obtaining a plurality of gas concentrations;
preferably, the angle adjusting device comprises an angle controller, the angle controller is respectively and electrically connected with the control unit, the laser generator and the laser receiver, and the angle controller is used for driving the laser generator and the laser receiver to switch the angle.
10. The mine goaf fire monitoring and early warning device according to any one of claims 7 to 9, wherein the visual monitoring module comprises a CCD camera and a management module which are electrically connected, the CCD camera is used for shooting a real-time image of a fire point and transmitting the real-time image to the management module, and the management module is used for analyzing and processing the real-time image;
preferably, the temperature detection module comprises an infrared thermal imaging device and an analysis module, wherein the infrared thermal imaging device is used for acquiring thermal imaging images in a monitoring area, and the analysis module is used for analyzing and processing the thermal imaging images;
preferably, the temperature detection module comprises distributed temperature sensing optical fibers, the distributed temperature sensing optical fibers are laid in the monitoring area, the distributed temperature sensing optical fibers comprise a plurality of temperature sensing optical fibers, the temperature sensing optical fibers in each monitoring area are symmetrically distributed by taking the central line of the monitoring area as an axis, and two adjacent temperature sensing optical fibers are equidistantly arranged.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117373198A (en) * | 2023-12-05 | 2024-01-09 | 广州金王科技股份有限公司 | Parking lot alarm monitoring method, device and storage medium |
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| CN117373198A (en) * | 2023-12-05 | 2024-01-09 | 广州金王科技股份有限公司 | Parking lot alarm monitoring method, device and storage medium |
| CN117373198B (en) * | 2023-12-05 | 2024-02-20 | 广州金王科技股份有限公司 | Parking lot alarm monitoring method, device and storage medium |
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