CN111831780B - Method for early warning of traceable VOC leakage risk point - Google Patents
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Abstract
A method for early warning and tracing a VOC leakage risk point belongs to the technical field of VOC pollution monitoring. The method combines laser radar scanning and infrared thermal imaging technologies, utilizes the horizontal concentration distribution data of the total amount of VOC obtained by laser radar detection, analyzes the high concentration pollution zone of the total amount of VOC in a scanning monitoring area in real time, and calculates the specific geographic position of high concentration VOC pollution by combining GIS geographic information; automatically adjusting the focal length, pitch angle and azimuth angle of the camera, finishing image video evidence collection, simultaneously applying an image recognition technology, tracking and tracing to a device with VOC sudden leakage, and pushing early warning information. The method can timely and rapidly monitor the high-concentration pollution area of the VOC in the chemical industry park, trace the source to a specific VOC leakage device and provide image video evidence; meanwhile, the method can be automatically executed within 24 hours, and an effective way is provided for VOC pollution tracing and early warning management and control.
Description
Technical Field
The invention belongs to the technical field of VOC pollution monitoring, relates to a method for early warning and tracing a VOC leakage risk point, and particularly relates to a method for early warning and tracing a VOC leakage risk point, in particular to a chemical device VOC leakage risk point by combining laser radar scanning and infrared thermal imaging technology.
Background
With the rapid development of economy, environmental pollution is becoming serious, especially in chemical parks and industrial concentration areas. In various pollution types, VOC pollution is gradually emphasized, and is mainly monitored and treated.
In industrial chemical industry garden, there is the risk that VOC suddenly revealed, but because the garden does not have omnidirectional monitored control system, can't in time discover, especially under the condition that artificial intervention such as night reduces, cause the excessive emission of VOC easily, probably takes place the environmental accident when serious. In view of this, there is a need for an online, full-time, all-around monitoring means that can discover devices that may have VOC leakage in time and locate device areas for image video forensics to reduce such uncontrolled burstiness risk.
Disclosure of Invention
The invention aims to provide a method for early warning and tracing VOC leakage risk points, which is used for realizing online, full-time and all-dimensional monitoring by combining laser radar scanning and infrared thermal imaging technologies, timely finding out devices possibly having VOC leakage and positioning device areas, and performing image video evidence collection so as to reduce uncontrollable burst risks.
The invention utilizes the laser radar detection to obtain the VOC total amount horizontal concentration distribution data, instantly analyzes and scans the VOC total amount high concentration pollution zone in the monitoring area, and calculates the specific geographic position of the high concentration VOC pollution by combining with GIS geographic information. According to the geographic position and the geographic position of the thermal imaging camera, the focal length, the pitch angle and the azimuth angle of the camera are automatically adjusted by combining with a device database of the monitoring area, which has the risk of VOC leakage, image video evidence collection is completed, meanwhile, an image recognition technology is applied, the device with the sudden VOC leakage is tracked and traced, and early warning information is pushed. The specific technical scheme is as follows.
A method for early warning of traceable VOC leakage risk points comprises the following steps:
(1) Establishing an emission device database in which VOC leakage risks exist in a monitoring area;
(2) Establishing a laser radar monitoring station, wherein the laser radar scanning range covers all monitored areas, and the laser radar has the continuous working capacity of 7×24 hours;
(3) Establishing shooting points of an infrared thermal imaging camera above the laser radar, wherein the shooting range of the infrared thermal imaging camera covers all the monitored area, and the infrared thermal imaging camera has the continuous working capacity of 7X 24 hours;
(4) The laser radar executes a scanning task and uploads data to a control center; the control center analyzes the continuous scanning results for a plurality of times to form VOC total quantity distribution data in the continuous scanning range;
(5) The control center judges whether an exceeding area exists in the scanning area according to a preset exceeding threshold value of the total VOC; if the out-of-standard area exists, calculating the distance and azimuth angle between the out-of-standard area and the camera;
(6) The control center sends a camera control command, rotates a camera lens to the azimuth of the pollution area, adjusts the focal length of the camera, takes a group of pictures and records a video, and uploads the pictures and the video to the control center;
(7) The control center carries out image recognition on the pictures and the videos obtained in the step (6) and judges whether VOC leakage exists or not; and (3) if VOC leakage exists, tracing the source by combining the point location database in the step (1), and pushing image and text early warning information.
Further, the emission device database in step (1) records in detail the geographical location information and the emission port height information of each VOC emission device in the monitored area.
Further, in the step (4), the total VOC distribution data in the laser radar scanning range is rasterized and divided into a plurality of square areas, and each square area data comprises VOC concentration data and geographic information data.
Further, the image recognition in the step (7) firstly determines and recognizes whether a high heat source scene exists in the thermal imaging picture; and secondly, judging and identifying whether the key device VOC leakage exists in the visible light picture.
Further, the monitoring area is a chemical industry park.
The method for early warning and tracing the VOC leakage risk points can timely and rapidly monitor the high-concentration pollution area of the VOC in the chemical industry park, trace the source to a specific VOC leakage device and provide image video evidence; meanwhile, the method can be automatically executed in 24 hours in practical application, and the full-time monitoring greatly improves the VOC pollution monitoring capability, and provides an effective way for VOC pollution tracing and early warning management and control.
Drawings
FIG. 1 is a schematic diagram of gridding division and grid acquisition of a scan area.
Fig. 2 is a schematic diagram of parameters required for computing and controlling video capture of a camera image.
Fig. 3 is a trace of the VOC leakage point.
Reference numerals: 1-a thermal imaging camera; 2-laser radar; 3-a round area scanned by a laser radar; 4 to 5 represent sector areas formed by three scans; 6-grid Ri with out-of-standard pollution exists after grid formation, and the geographic coordinate of the center point is Gp2; 7-average height aH of a key device in the square; 8-compass, north azimuth is 0 °.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A method for early warning of a traceable VOC leakage risk point monitors a chemical industry park. The method comprises the following specific steps:
1) Firstly, establishing a park VOC emission accent device database Kds, and recording the geographical position information and the discharge port height information of each VOC emission device in a chemical industry park in detail for later early warning and tracing.
2) The laser radar is used to acquire the total VOC pollution distribution data (here denoted as: f) The pollution distribution data is geographically represented as sectors, the center of the sectors being the location of the lidar (denoted herein as: p), the radius is the laser radar effective scan radius (denoted herein as: r) is defined as (1);
3) The whole scanning area is rasterized according to the pollution judgment precision (namely, the pollution judgment size Pr is set to be 50 meters here), the square occupied by the sector (assumed to be Rect [ ] Rn) is obtained, and the longitude and latitude of the upper left corner and the lower right corner of each rectangular area are calculated by combining GIS geographic information, as shown in figure 1.
Wherein the data structure of Rect is as follows:
4) Traversing the grid Ri in the Rn obtained in the step 3), calculating the geographical range Region contained in the grid Ri, obtaining the maximum concentration value of the total VOC in the Region from the F calculated in the step 1), filling TVOCmax of the grid Ri, judging whether the grid Ri exceeds the standard (assuming that the exceeding standard concentration is Tm), and eliminating the grid Ri without the exceeding standard;
5) Traversing the key device database Kds, and associating the grid Rn processed in the step 4) with Kds according to GIS geographic information. Then, rn is split into two parts, one is a set Rnh of accent discharge devices in the square, and the other is a set Rnn of accent devices in the square.
6) Traversing the grid Rim in the step Rnh, calculating the longitude and latitude Gpm of the grid central point, calculating the distance Dm between the central point and the camera by combining GIS geographic information calculation and trigonometric function, azimuth Azm and pitch angle Pch, and then automatically controlling the camera to shoot image video information, wherein the method comprises the following steps: thermal imaging image video information, visible light image video information. The process is shown in fig. 2;
7) Firstly, judging and identifying whether a high heat source scene exists in a thermal imaging picture by adopting an image identification technology; secondly, judging and identifying whether emission behaviors such as a key device chimney exist in the visible light picture;
8) And (3) automatically judging whether VOC leakage is possible or not according to the total VOC exceeding numerical value, the thermal imaging picture identification Result and the visible light picture identification Result, and obtaining a Result set Result1 for judging the VOC leakage is assumed.
9) The square grid Ri in step Rnn is traversed and the square grid center point Gp2 is calculated according to the method in fig. 2. The key device surrounded by Cr is searched from the key device database Kds by taking Gp2 as a circle center and R (R takes 200 meters) as a radius setting circle Cr, and if not searched, the radius R is enlarged (50 meters are added each time) until the key device (marked as an Kn set) is searched.
10 Traversing the key device Kj in the Kn, calculating parameters required by camera shooting according to the geographical information and the height information of the key device and the method shown in fig. 2, obtaining image video information, and obtaining a Result set Result2 for judging that VOC leakage tracing exists according to the judging results of the steps 7) and 8).
11 Comprehensive Result1 and Result2, eliminating the judging Result of the repeating device, obtaining the pollution tracing early warning information of the final high-concentration VOC region, integrating and displaying the information, pushing the tracing early warning information and obtaining the image video evidence information.
Through the method, the high-concentration pollution area of the VOC in the chemical industry park can be timely and rapidly monitored, a specific VOC leakage device is traced to, and image video evidence is provided, as shown in fig. 3.
Claims (5)
1. The method for early warning of the traceable VOC leakage risk point is characterized by comprising the following steps of:
(1) Establishing an emission device database in which VOC leakage risks exist in a monitoring area;
(2) Establishing a laser radar monitoring station, wherein the laser radar scanning range covers all monitored areas, and the laser radar has the continuous working capacity of 7×24 hours;
(3) Establishing shooting points of an infrared thermal imaging camera above the laser radar, wherein the shooting range of the infrared thermal imaging camera covers all the monitored area, and the infrared thermal imaging camera has the continuous working capacity of 7X 24 hours;
(4) The laser radar executes a scanning task and uploads data to a control center; the control center analyzes the continuous scanning results for a plurality of times to form VOC total quantity distribution data in the continuous scanning range;
(5) The control center judges whether an exceeding area exists in the scanning area according to a preset exceeding threshold value of the total VOC; if the out-of-standard area exists, calculating the distance and azimuth angle between the out-of-standard area and the camera;
(6) The control center sends a camera control command, rotates a camera lens to the azimuth of the pollution area, adjusts the focal length of the camera, takes a group of pictures and records a video, and uploads the pictures and the video to the control center;
(7) The control center carries out image recognition on the pictures and the videos obtained in the step (6) and judges whether VOC leakage exists or not; and (3) if VOC leakage exists, tracing the source by combining the emission device database in the step (1), and pushing image and text early warning information.
2. The method of claim 1, wherein the emissions database of step (1) details geographic location information and emissions height information for each VOC emissions device within a monitored area.
3. The method of claim 1, wherein step (4) rasterizes the total VOC distribution data within the laser radar scan range into a plurality of square grid areas, each square grid area data comprising VOC concentration data and geographic information data.
4. The method of claim 1, wherein the image recognition in step (7) first determines and recognizes whether a high heat source scene is present in the thermographic picture; and secondly, judging and identifying whether the key device VOC leakage exists in the visible light picture.
5. The method of claim 1, wherein the monitoring area is a chemical park.
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| CN113324924A (en) * | 2021-07-05 | 2021-08-31 | 中国科学技术大学先进技术研究院 | Hyperspectral remote sensing system for scanning and imaging overhead pollution source |
| CN113470050A (en) * | 2021-08-01 | 2021-10-01 | 北京环拓科技有限公司 | Method for analyzing, identifying and quantifying VOC (volatile organic compound) leakage by utilizing double-spectrum image |
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| CN104122054A (en) * | 2014-07-27 | 2014-10-29 | 北京航星网讯技术股份有限公司 | Infrared thermal imaging type laser gas leak detection method and apparatus |
| CN109686059A (en) * | 2018-12-29 | 2019-04-26 | 北京维禹特科技发展有限公司 | A kind of VOCs leakage monitoring traceability system and method |
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| JP2004028601A (en) * | 2002-06-21 | 2004-01-29 | Mitsubishi Heavy Ind Ltd | Monitoring laser radar system, and imaging method |
| CN110095423B (en) * | 2018-12-17 | 2024-05-24 | 中国科学院合肥物质科学研究院 | Multichannel pollution emission emergency telemetry imaging system and method |
| CN109696208A (en) * | 2018-12-29 | 2019-04-30 | 北京维禹特科技发展有限公司 | A kind of waste gas monitoring traceability system and method |
| CN111221004B (en) * | 2020-01-18 | 2022-04-19 | 北京环拓科技有限公司 | Method for detecting VOC distribution by utilizing laser radar 3D scanning |
| CN111220618B (en) * | 2020-02-25 | 2020-12-04 | 广州华粤科技有限公司 | Device for remotely monitoring VOCS (volatile organic Compounds) emission of pollutant gas based on unmanned aerial vehicle |
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| CN104122054A (en) * | 2014-07-27 | 2014-10-29 | 北京航星网讯技术股份有限公司 | Infrared thermal imaging type laser gas leak detection method and apparatus |
| CN109686059A (en) * | 2018-12-29 | 2019-04-26 | 北京维禹特科技发展有限公司 | A kind of VOCs leakage monitoring traceability system and method |
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