A chemical park gas telemetry alarm integration method and system

Abstract

The present invention provides a gas telemetry alarm integration method and system for a chemical park, the method comprising: drawing a distribution map of the park's devices; obtaining the gas types and infrared spectrum characteristics of each device in the chemical park; arranging gas telemetry equipment according to the specific equipment configuration of the park; performing gas detection and identification; using gas alarm thresholds for judgment and alarm; locating the gas leakage source using gas telemetry equipment; and pushing alarm information. The present invention solves the technical problems of unreasonable equipment layout, low positioning accuracy, and reliance on manual operation.

Description

Technical Field

[0001] The invention relates to the field of chemical park security, and in particular to a chemical park gas telemetry alarm integration method and system. Background Art

[0002] Gas leakage in chemical parks may lead to serious consequences such as gas pollution, explosion, and human poisoning. Therefore, it is of great significance to carry out gas leakage monitoring in chemical parks.

[0003] Infrared telemetry equipment can detect and identify gas at a long distance, monitor gas leaks at a long distance and locate the source of the leak. The monitoring personnel in the park obtain information such as the type of gas leak, leakage event, leakage location, tank area or pipeline where the gas leak occurs through text messages, WeChat push, etc., in order to facilitate subsequent investigation and disposal. The existing invention application document "A handheld laser methane gas reflector leak detection device" with publication number CN103884477A includes: a laser reflector, a handheld laser methane telemeter, and the laser reflector is installed at a location where methane gas leakage may occur; the handheld laser methane telemeter includes a battery charging module, a voltage conversion module, a laser methane sensor module, a spectral analysis module, a display module and an alarm module; the laser methane sensor module also includes a laser and a laser detector; the laser of the laser methane sensor module outputs a laser signal and reflects a light signal through the laser reflector; the laser detector of the laser methane sensor module receives the laser signal reflected by the laser reflector. From the specific implementation content of the prior art, it can be seen that the prior art detection device needs to rely on manual regular inspection of the methane gas reflector, which restricts the efficiency and accuracy of gas detection. At the same time, the prior art only detects methane gas and a specific device, namely the gas reflector, and adopts a conventional system layout, which limits the applicability of the prior art.

[0004] The existing invention patent document "Gas Remote Sensing Method with Alarm Function" with publication number CN103091266A includes the following steps: (A1) the measuring light emitted by the measuring light source passes through the gas to be measured, and the measuring light is reflected by the reflector and then received by the detector, and the detector converts the optical signal into an electrical signal and transmits it to the electronic module; (A2) the electronic module uses a formula to process the received electrical signal to obtain the average concentration C of the gas to be measured, and transmits it to the judgment module; (A3) the judgment module compares the received average concentration C with the alarm value: if the average concentration C is less than the alarm value, no alarm is required; if the average concentration C is greater than or equal to the alarm value, a prompt is sent to the alarm module; (A4) the alarm module sends an alarm signal according to the received prompt. From the specific implementation logic of the prior art, it can be seen that the prior art only uses the alarm value as the threshold to determine whether the average concentration C is abnormal. At the same time, its telemetry scheme obtains the distance between the abnormality location and the detection end by calculating the phase delay of the modulated light in a round trip. It can be seen that the result obtained by the existing telemetry scheme is a larger range, and its telemetry accuracy is low. It also limits the efficiency of the discovery of faults such as gas leaks and maintenance operations. It is not suitable for specific application scenarios such as dangerous gas leaks in chemical parks, and has low applicability.

[0005] In summary, the existing technology has technical problems such as unreasonable equipment layout, low positioning accuracy and reliance on manual operation. Summary of the invention

[0006] The technical problem to be solved by the present invention is how to solve the technical problems existing in the prior art, such as unreasonable equipment layout, low positioning accuracy and reliance on manual operation.

[0007] The present invention adopts the following technical solutions to solve the above technical problems: A chemical park gas remote sensing alarm integration method comprises:

[0008] S1. Record the gas devices in the park to draw and mark the location of each gas device to obtain a device distribution map of the chemical park;

[0009] S2. Record the types of gas storage and production in each gas device, and search and obtain gas characteristics from a preset database based on the types of gas storage and production, wherein the types of gas storage and production are not less than 2;

[0010] S3. Collect gas leak detection demand data and obtain the number of devices to lay out the layout area of ​​the telemetry equipment. When there are no less than two gas telemetry devices, locate the gas to be tested and reconstruct the three-dimensional concentration to scan and obtain the scanning image of the target cloud.

[0011] S4. Using spectrum matching and pattern recognition operations, classify and process the gas features in the scanned image to obtain and return gas type data to the preset main control device;

[0012] S5. Using the preset main control device, the gas type data and scanning imaging are processed according to the infrared spectrum characteristics to obtain gas monitoring information, and the gas monitoring information is processed using the preset alarm threshold to obtain gas leakage information and alarm;

[0013] S6. Using the gas remote sensing equipment in the deployment area, identify and locate the gas leakage location according to the gas characteristics;

[0014] S7. Use the preset cloud push platform to send gas leakage information and gas leakage device monitoring terminals to perform chemical park maintenance operations.

[0015] Use the park surveying map to mark the tank area, pipelines and other equipment for storing gas to form a layout diagram of the park equipment. According to the monitoring needs, the installation location of the infrared telemetry equipment is rationally laid out. Use infrared telemetry equipment to monitor whether the gas is leaking and locate the source of the leak. According to the number of equipment and the test results, locate the specific location or direction of the leaking gas storage tank, provide monitoring information for monitoring personnel, facilitate subsequent investigation and disposal, and improve the positioning accuracy of the leak location and the maintenance efficiency of the chemical park equipment.

[0016] The present invention combines the location distribution map of key devices such as gas storage tanks and pipelines in the park, and continuously detects key devices such as gas storage tanks and pipelines through gas telemetry equipment. Once a gas leak is found, the alarm information is pushed to the monitoring personnel's mobile phone through SMS or WeChat, etc. This solves the defects of traditional technology that relies on manual monitoring.

[0017] In a more specific technical solution, in step S1, the position of the gas device includes: device height, device orientation and device distance.

[0018] In a more specific technical solution, in step S2, the types of gases in each gas device are counted and listed.

[0019] In a more specific technical solution, step S3 includes:

[0020] S31. Arrange the layout area of ​​the gas remote sensing equipment according to the gas leakage monitoring demand data, the number of equipment and the number of gas remote sensing equipment;

[0021] S32. When one gas remote sensing device is used, the distribution position of the gas remote sensing device is adjusted to cover all gas devices, wherein, in the same direction, when there are no less than two gas devices in the layout area, leakage location is performed according to the gas characteristics of different gas devices;

[0022] S33. When using at least two gas remote sensing devices, cross-scan the gas installations in the layout area with two or more gas remote sensing devices to locate the gas leakage source;

[0023] S34. Use two or more gas telemetry devices to locate the gas and reconstruct the three-dimensional concentration, so as to perform synchronous scanning in different directions to obtain scanning imaging of the target cloud.

[0024] In a more specific technical solution, in step S34, a three-dimensional reconstruction and solution of cloud concentration is performed in the overlapping area of ​​the detection field of view of the two gas remote sensing devices to obtain a three-dimensional distribution of cloud concentration, wherein step S34 also includes:

[0025] S341, calculating the spatial position and size of the overlapping area of ​​the field of view;

[0026] S342, calculating the number of single-sided grids by dividing the actual overlapping surface size by the grid size;

[0027] S343, determining the size of a single three-dimensional grid according to the maximum surface scanning density;

[0028] S344, gridding the three-dimensional space of the overlapping area of ​​the field of view, wherein step S344 includes:

[0029] S3441, calculating the coordinates of eight intersection points of a preset number of FTIR field of view cones in space, thereby forming a three-dimensional geometric body of an overlapping area;

[0030] S3442. Taking each FTIR position coordinate as a starting point, a field of view ray is emitted according to the number of scanning points and the field of view angle, and the intersection of each ray and the solid geometric body is obtained by processing.

[0031] S3443, cutting the solid geometric body based on the grid lines formed by the intersection points with the largest surface density, and completing the three-dimensional grid division of the overlapping field of view;

[0032] S345, matching the FTIR plane scanning concentration path length result with the overlapping area of ​​the field of view, dynamically allocating the concentration path length to each three-dimensional grid, and calculating the actual cloud concentration of each three-dimensional grid according to the grid thickness;

[0033] S346, performing dynamic inversion of grid concentration using preset inversion logic;

[0034] S347, performing three-dimensional concentration distribution rendering of the cloud cluster.

[0035] In a more specific technical solution, step S346 includes:

[0036] S3461. When one of the concentration path lengths CL(Mi, j, k) of a grid point on two FTIR lines of sight is 0, the concentration of the grid point is set to 0;

[0037] S362, when the concentration path lengths CL(Mi,j,k) of the grid points on the two FTIR sight lines are both greater than 0, let the concentration path length CL1(M i，j，k )=CL1 / N1, where CL1 is the total concentration path length on the FTIR1 line of sight, and N1 is the number of grids whose concentration path length on the FTIR1 line of sight is not equal to 0;

[0038] S363, traverse all points on the line of sight of FTIR1;

[0039] S364, let the concentration path length of point M on the FTIR2 line of sight be CL2 (M i，j，k )=CL2 / N2;

[0040] S365, if the concentration path length CL1 (M i，j，k ) is greater than the concentration path length CL2 (M) of point M on the FTIR2 line of sight i，j，k ), then let CL1(M i，j，k )=CL2(M i，j，k ), and update the concentration path length of other points on the FTIR1 line of sight except point M with the following logic:

[0041] CL1(M else )+=(CL1(M i，j，k )-CL2(M i，j，k )) / (N1-1).

[0042] S366, traverse all points on the line of sight of FTIR2, then CL(M i，j，k )=CL1(M i，j，k ), C(M i，j，k )=CL(M i，j，k ) / L(M i，j，k ), where L(M i，j，k ) is the path length of point M along the line of sight of FTIR1.

[0043] In the process of laying out the telemetry equipment, the present invention adopts different step-by-step strategies and coverage positioning methods for application scenarios using one gas telemetry device and multiple gas telemetry devices. At the same time, a leakage positioning method based on infrared spectral characteristics is designed for the situation where there are one or more park chemical plants in the same position, which improves the applicability of the present invention and makes the equipment layout more reasonable.

[0044] In a more specific technical solution, in step S34, a three-dimensional reconstruction and solution of cloud concentration is performed in the overlapping area of ​​the detection fields of view of two gas telemetry devices to obtain a three-dimensional distribution of cloud concentration.

[0045] In a more specific technical solution, step S5 includes:

[0046] S51, processing to obtain the average value of a single gas alarm, and using it as a preset alarm threshold;

[0047] S52, determining whether the gas monitoring information is higher than a preset alarm threshold;

[0048] S53: If yes, generate gas leakage information and alarm according to the current gas monitoring information;

[0049] S54: If not, filter out the gas monitoring information.

[0050] The present invention uses the average value of a single gas alarm in a chemical park as an alarm threshold. Information above the alarm threshold can be used as gas leakage information and alarm, and information below the alarm threshold can be ignored, thus filtering out some alarm information of drifting gas, making the alarm information more reliable and effective.

[0051] In a more specific technical solution, in step S6, the number of gas devices can be marked according to the gas telemetry equipment used, and the leakage is located according to the characteristic gases of different gas devices.

[0052] In a more specific technical solution, the gas characteristics in step S6 include: infrared spectrum characteristics.

[0053] In a more specific technical solution, a chemical park gas telemetry alarm integrated system includes:

[0054] A distribution map drawing module is used to record the gas devices in the park, to draw and mark the location of each gas device, and to obtain a device distribution map of the chemical park;

[0055] The gas type characteristic module is used to record the types of gas storage and production in each gas device, and to search and obtain infrared spectrum characteristics from a preset database, wherein the types of gas storage and production are not less than 2;

[0056] The reconstruction scanning imaging module is used to collect gas leakage detection demand data and obtain the number of equipment to layout the layout area of ​​the telemetry equipment. When there are no less than two gas telemetry equipment, the measured gas is positioned and the three-dimensional concentration is reconstructed to scan and obtain the scanning imaging of the target cloud. The reconstruction scanning imaging module is connected with the distribution map drawing module and the gas type feature module;

[0057] A spectrum recognition module is used to classify and process the gas features in the scanning imaging by using spectrum matching and pattern recognition operations, so as to obtain and return the gas type data to the preset main control device. The spectrum recognition module is connected to the reconstruction scanning imaging module;

[0058] An alarm module is used to process gas type data and scan imaging according to infrared spectrum characteristics using a preset main control device to obtain gas monitoring information, and to process the gas monitoring information using a preset alarm threshold to obtain gas leakage information and alarm, and is connected to the gas type characteristic module, the reconstruction scanning imaging module and the spectrum recognition module;

[0059] A leakage location positioning module is used to identify and locate the gas leakage location according to the gas characteristics by using the gas telemetry equipment in the layout area. The leakage location positioning module is connected to the alarm module;

[0060] The information push module is used to utilize the preset cloud push platform to transmit the gas leakage information and the gas leakage device monitoring terminal, so as to perform chemical park maintenance operations. The information push module is connected with the alarm module and the leakage location positioning module.

[0061] Compared with the prior art, the present invention has the following advantages: the present invention uses the park surveying map to mark the tank area, pipelines and other equipment for storing gas to form a layout diagram of the park equipment; according to the monitoring requirements, the installation position of the infrared telemetry equipment is rationally arranged. The infrared telemetry equipment is used to monitor whether the gas is leaking and locate the direction of the leak source. According to the number of equipment and the test results, the specific position or direction of the leaking gas storage tank is located, and monitoring information is provided to the monitoring personnel, which is convenient for subsequent investigation and disposal, and improves the positioning accuracy of the leak position and the maintenance efficiency of the chemical park equipment.

[0062] The present invention combines the location distribution map of key devices such as gas storage tanks and pipelines in the park, and continuously detects key devices such as gas storage tanks and pipelines through gas telemetry equipment. Once a gas leak is found, the alarm information is pushed to the monitoring personnel's mobile phone through SMS or WeChat, etc. This solves the defects of traditional technology that relies on manual monitoring.

[0063] In the process of laying out the telemetry equipment, the present invention adopts different step-by-step strategies and coverage positioning methods for application scenarios using one gas telemetry device and multiple gas telemetry devices. At the same time, a leakage positioning method based on infrared spectral characteristics is designed for the situation where there are one or more park chemical plants in the same position, which improves the applicability of the present invention and makes the equipment layout more reasonable.

[0064] The present invention uses the average value of a single gas alarm in a chemical park as an alarm threshold. Information above the alarm threshold can be used as gas leakage information and alarm, and information below the alarm threshold can be ignored, thereby filtering out some alarm information of drifting gas, making the alarm information more reliable and effective. The present invention solves the technical problems of unreasonable equipment layout, low positioning accuracy and reliance on manual operation in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 This is a schematic diagram of the basic steps of the chemical park gas remote sensing alarm integration method according to Example 1 of the present invention;

[0066] Figure 2 This is a schematic diagram of a typical plant device layout of Example 1 of the present invention;

[0067] Figure 3 This is a characteristic infrared spectrum diagram of typical chemical gas formaldehyde in Example 1 of the present invention;

[0068] Figure 4 This is a schematic diagram of the layout of a gas remote sensing device according to Example 1 of the present invention;

[0069] Figure 5 This is a schematic diagram of locating a leakage source by two or more gas remote sensing devices according to Example 1 of the present invention;

[0070] Figure 6 This is a schematic diagram of the positions and scanning ranges of two devices in Example 1 of the present invention;

[0071] Figure 7 This is a schematic diagram of the scanning imaging field of view intersection and cloud positioning principle of Example 1 of the present invention;

[0072] Figure 8 This is a three-dimensional distribution effect diagram of the gas cloud in Example 1 of the present invention

[0073] Fig. 9 This is a schematic diagram of passive infrared remote sensing of polluted gas according to Example 2 of the present invention;

[0074] Fig.10 This is a schematic diagram of the process of gas remote sensing and leakage point location of more than two devices in Example 2 of the present invention;

[0075] Fig.11 This is a schematic diagram of three-dimensional grid division of two FTIRs in Example 2 of the present invention;

[0076] Fig.12 This is a schematic diagram of the three-dimensional grid concentration inversion in the overlapping area of ​​Example 2 of the present invention. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0078] Example 1

[0079] The present invention provides a chemical park gas telemetry alarm integration method and system, which combines the location distribution map of key devices such as gas storage tanks and pipelines in the park, and continuously monitors key devices such as gas storage tanks and pipelines through gas telemetry equipment. A chemical park gas telemetry alarm integration method includes the following basic steps:

[0080] S1. Draw a distribution map of the park equipment;

[0081] S2. Obtain the gas types and infrared spectrum characteristics of each device in the chemical park;

[0082] S3. Arrange gas telemetry equipment according to the specific equipment configuration of the park;

[0083] S4, perform gas detection and identification;

[0084] S5. Use the gas alarm threshold to make judgments and alarms;

[0085] S6. Locate the source of gas leakage using gas telemetry equipment;

[0086] S7. Push alarm information.

[0087] like Figure 2 As shown, in this embodiment, in step S1 of drawing the distribution map of the park device, the positions of the devices such as the tank area and pipeline 1 that need to be monitored are drawn and marked, and the height, orientation, distance and other information of the devices are recorded. The tank area also includes: gas storage tank 2, refining device 3,

[0088] like Figure 3 As shown, in step S2 of recording the types of gases stored or generated by each device and searching for their infrared spectral characteristics, since the gases stored, transported, and generated by different devices are different, the types of gases in each device are counted and listed, the types of gases that need to be monitored by each device are recorded, and the infrared spectral characteristics of the gases are searched from the database.

[0089] In this embodiment, in step S3 of rationally arranging the gas telemetry equipment, the arrangement area of ​​the telemetry equipment is rationally arranged according to the gas leakage monitoring requirements and the number of equipment. The main schemes include two situations:

[0090] (1) Figure 4 As shown in the figure, in the scenario of using a gas remote sensing device:

[0091] A gas remote sensing device 4 needs to cover all devices according to the device distribution location. A gas remote sensing device 4 can only mark the device in a certain direction. If there are multiple devices in this direction, the leakage is located according to the characteristic gases of different devices, where the dotted line represents the field of view of the device.

[0092] (2) Figure 5 As shown in the figure, in the scenario where two or more gas telemetry devices are used:

[0093] Two or more gas telemetry devices locate the source of gas leakage through cross scanning, where the dotted line represents the field of view of the device.

[0094] like Figures 6 to 8 As shown, two or more gas remote sensing devices are used Figure 5 The gas remote sensing device 1' and the gas remote sensing clone 2' can locate the gas and reconstruct the three-dimensional concentration, and simultaneously scan and image the target cloud from different directions. The three-dimensional reconstruction and solution of the cloud concentration are performed in the overlapping area of ​​the detection field of view of the two gas remote sensing devices to obtain the three-dimensional distribution of the cloud concentration.

[0095] In this embodiment, in step S4 of gas detection and identification, algorithms such as spectrum matching and pattern recognition are used to identify and classify gas spectrum features, confirm the gas type, and transmit the information back to the main control.

[0096] In this embodiment, in step S5, the average value of the alarm for a single gas in the chemical park is used as the alarm threshold. Information above the alarm threshold can be used as gas leakage information and alarm, and information below the alarm threshold can be ignored, so that some alarm information of drifting gas is filtered out, making the alarm information more reliable and effective.

[0097] In this embodiment, the step S6 of locating the gas leakage source includes the following application scenarios:

[0098] (1) When using a gas remote sensing device:

[0099] One device can only mark a device in a certain direction. If there are multiple devices in this direction, the leak will be located based on the characteristic gases of different devices.

[0100] (2) When two or more devices are used:

[0101] Two or more devices can accurately locate the source of the gas leak, thereby locating the device where the gas leak occurs.

[0102] In the push step S7, the alarm information push system is used to send information such as the gas leakage device information, leakage time, location, type of leaked gas, etc. to the monitoring personnel's mobile phone through the cloud push platform in the form of text messages, WeChat push, etc., to facilitate subsequent investigation and processing.

[0103] Example 2

[0104] When a passive remote sensing Fourier transform infrared spectrometer is used to detect a target cloud in its field of view, the radiation signal measured by the spectrometer contains both the background signal in the spectrometer field of view and the target cloud signal and the atmospheric signal. A three-layer model can be used to describe the measurement process. Figure 1 As shown, the first layer is the atmosphere, the second layer is the target gas cloud, and the third layer is the field of view background such as the low sky, buildings, trees, mountains, etc.

[0105] like Fig. 9 As shown in the figure, in this model, each layer is considered to be uniform and fills the instrument field of view. Since the selected band is 1300cm-1 to 700cm-1, in this band, the radiation of the atmosphere and background objects themselves is the main part of the total radiation, and the reflection, scattering and multiple scattering of sunlight by the surrounding environment can be ignored.

[0106] The radiation brightness L (W / m2·Sr·cm-1) incident on the spectrometer is:

[0107]

[0108] here,

[0109] τ i : transmittance of the i-th layer;

[0110] B i : Blackbody radiation brightness at the temperature of the i-th layer;

[0111] L3: Spectral radiance ahead of the polluting gas cloud.

[0112] Assuming that the cloud thickness is relatively small compared to the distance between the cloud and the spectrometer, and there is no polluted gas cloud in the field of view of the spectrometer, that is, τ2 = 1, the radiation brightness L0 incident on the spectrometer is

[0113] L0=(1-τ1)B1+τ1L3 (2)

[0114] Combining equations (1) and (2), we can get the relationship between L and L0 as follows:

[0115] L=L0+τ1(1-τ2)(B2-L3) (3)

[0116] In the infrared spectrum, the target cloud generally has several strong absorption or emission characteristics, which is the physical basis for the spectral identification of polluted gases. The radiation signal received by the spectrometer includes both the background signal in the spectrometer field of view and the target cloud signal and the atmospheric signal. The weak target gas radiation accounts for only 1% or even less of the total energy. To identify and classify the target cloud spectrum, the background radiation signal must be deducted first.

[0117] The difference in radiance incident on the detector when there is a target cloud or not can be expressed as

[0118] ΔL=L-L0=τ1(1-τ2)(B2-L3) (4)

[0119] The difference spectrum ΔL deducts most of the background radiation and can characterize the spectral characteristics of the target cloud.

[0120] As the cloud diffuses and exchanges heat with the atmosphere, its temperature quickly approaches the atmospheric temperature. Then equation (4) can be simplified to

[0121] ΔL=τ1(1-τ2)(B1-L3) (5)

[0122] Formula (2) can be transformed into

[0123] τ1(B1-L3)=B1-L0 (6)

[0124] Substituting formula (6) into formula (5), we can get:

[0125] ΔL=(1-τ2)(B1-L0) (7)

[0126] The cloud transmittance τ2 in the formula can be calculated by the following formula:

[0127] τ2(ν)=e -α(ν)CL (8)

[0128] Where:

[0129] α(ν): absorption coefficient of atmospheric clouds (ppm-1m-1)

[0130] CL: Concentration-length product of atmospheric clouds (ppm*m), that is, the product of the concentration of atmospheric clouds in the direction of the field of view axis and the thickness of atmospheric clouds.

[0131] According to formula (8), the gas concentration path length CL is obtained, and its physical meaning is the product of gas concentration and cloud thickness, that is, gas column concentration:

[0132] CL=-ln(τ2(ν)) / α(ν) (9)

[0133] like Fig.10As shown, the steps for gas remote sensing and leak location of more than 2 devices include:

[0134] S1', calculate the spatial position and size of the overlapping area of ​​the field of view;

[0135] S2', calculate the number of single-sided grids by dividing the actual overlapping surface size by the grid size;

[0136] S3', determining the size of a single three-dimensional grid according to the maximum surface scanning density;

[0137] S4', gridding the three-dimensional space of the overlapping area of ​​the field of view;

[0138] S5', dynamically assigning the concentration path length to each three-dimensional grid by matching the FTIR plane scanning concentration path length result with the overlapping area of ​​the field of view, and calculating the actual cloud concentration of each three-dimensional grid according to the grid thickness;

[0139] S6', using preset inversion logic to perform dynamic inversion of grid concentration;

[0140] S7', performing three-dimensional concentration distribution rendering of the cloud cluster.

[0141] By using more than two devices, the three-dimensional gas concentration C can be calculated and the location of the gas leakage source can be located. This is mainly done through spatial position division and concentration reconstruction algorithm. The specific process is as follows:

[0142] like Fig.11 As shown in Figure 2, the two most critical steps are (1) 3D grid division in the overlapping area and (2) 3D grid concentration inversion in the overlapping area, which are calculated as follows:

[0143] (1) 3D grid division in overlapping areas

[0144] like Fig.12 As shown, in this embodiment, the specific process of three-dimensional grid division includes:

[0145] The coordinates of the eight intersection points of the two FTIR field of view cones in space are calculated to form an octahedron of the overlapping area.

[0146] Taking each FTIR position coordinate as the starting point, according to the number of scanning points and the field of view angle, the field of view rays are emitted, and the intersection points of each ray and the octahedron are calculated.

[0147] The octahedron is cut based on the grid lines formed by the intersection points with the largest surface density to complete the three-dimensional grid division of the overlapping field of view.

[0148] (2) Concentration inversion of three-dimensional grids in overlapping areas

[0149] In this embodiment, taking the grid point Mi,j,k as an example, the grid concentration inversion algorithm process includes:

[0150] If one of the concentration path lengths CL(Mi,j,k) of the grid point Mi,j,k on the two FTIR lines of sight is 0, then the concentration C(Mi,j,k) of Mi,j,k is set to 0.

[0151] If the CL(Mi,j,k) of the grid point Mi,j,k on both FTIR lines of sight is greater than 0, then let the concentration path length CL1(M i，j，k )=CL1 / N1. Where CL1 is the total concentration path length on the line of sight of FTIR1, and N1 is the number of grids whose concentration path length on the line of sight of FTIR1 is not equal to 0. Repeat steps 1 to 2 until all points on the line of sight of FTIR1 are traversed.

[0152] At the same time, let the concentration path length CL2 (M i，j，k )=CL2 / N2. If CL1(M i，j，k )>CL2(M i，j，k ), let CL1(M i，j，k )=CL2(M i，j，k ), update the concentration path length of other points on the FTIR1 line of sight except point M, CL1(M else )+=(CL1(M i，j，k )-CL2(M i，j，k )) / (N1-1).

[0153] Repeat step 3 until all points on the line of sight of FTIR2 are traversed, then CL(M i，j，k )=CL1(M i，j，k ), C(M i，j，k )=CL(M i，j，k ) / L(M i，j，k ), where L(M i，j，k ) is the path length of point M along the line of sight of FTIR1.

[0154] In summary, the present invention uses the park surveying map to mark the tank area, pipelines and other equipment for storing gas to form a layout diagram of the park equipment; according to the monitoring requirements, the installation location of the infrared telemetry equipment is rationally laid out. The infrared telemetry equipment is used to monitor whether the gas is leaking and locate the direction of the leak source. According to the number of equipment and the test results, the specific location or direction of the leaking gas storage tank is located, and monitoring information is provided to the monitoring personnel, which is convenient for subsequent investigation and disposal, and improves the positioning accuracy of the leak position and the maintenance efficiency of the chemical park equipment.

[0155] The present invention combines the location distribution map of key devices such as gas storage tanks and pipelines in the park, and continuously detects key devices such as gas storage tanks and pipelines through gas telemetry equipment. Once a gas leak is found, the alarm information is pushed to the monitoring personnel's mobile phone through SMS or WeChat, etc. This solves the defects of traditional technology that relies on manual monitoring.

[0156] In the process of laying out the telemetry equipment, the present invention adopts different step-by-step strategies and coverage positioning methods for application scenarios using one gas telemetry device and multiple gas telemetry devices. At the same time, a leakage positioning method based on infrared spectral characteristics is designed for the situation where there are one or more park chemical plants in the same position, which improves the applicability of the present invention and makes the equipment layout more reasonable.

[0157] The present invention uses the average value of a single gas alarm in a chemical park as an alarm threshold. Information above the alarm threshold can be used as gas leakage information and alarm, and information below the alarm threshold can be ignored, thereby filtering out some alarm information of drifting gas, making the alarm information more reliable and effective. The present invention solves the technical problems of unreasonable equipment layout, low positioning accuracy and reliance on manual operation in the prior art.

[0158] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chemical park gas remote sensing alarm integration method, characterized in that: The method comprises: S1. Record the gas devices in the park to draw and mark the location of each gas device to obtain a device distribution map of the chemical park; S2, recording the types of gas storage and gas production in each of the gas devices, and searching and obtaining gas characteristics from a preset database based on the types of gas storage and gas production, wherein the types of gas storage and gas production are not less than 2; S3. Collect gas leakage detection demand data and obtain the number of devices to lay out the layout area of ​​the gas remote sensing device. When there are no less than two gas remote sensing devices, perform positioning and three-dimensional concentration reconstruction operations on the measured gas to scan and obtain scanning imaging of the target cloud. S4, using spectrum matching and pattern recognition operations to classify and process the gas features in the scanned image to obtain and return gas type data to a preset main control device; Wherein, the step S3 comprises: S31, laying out the layout area of ​​the gas remote sensing equipment according to the gas leakage detection demand data, the number of the equipment and the number of the gas remote sensing equipment; S32, when one gas remote sensing device is used, adjusting the distribution position of the gas remote sensing device to cover all the gas devices, wherein, in the same position, when there are no less than two gas devices in the arrangement area, leak location is performed according to the gas characteristics of different gas devices; S33, when using at least two gas remote sensing devices, cross-scanning the gas devices in the layout area with more than two gas remote sensing devices to locate the gas leakage source; S34, using two or more gas telemetry devices to locate the gas and reconstruct the three-dimensional concentration, so as to perform synchronous scanning in different directions, so as to obtain a scanning image of the target cloud; Wherein, in the step S34, a three-dimensional reconstruction and solution of cloud concentration is performed in the overlapping area of ​​the detection fields of view of the two gas remote sensing devices to obtain a three-dimensional distribution of cloud concentration, wherein the step S34 further includes: S341, calculating the spatial position and size of the overlapping area of ​​the field of view; S342, calculating the number of single-sided grids by dividing the actual overlapping surface size by the grid size; S343, determining the size of a single three-dimensional grid according to the maximum surface scanning density; S344, gridding the three-dimensional space of the overlapping area of ​​the field of view, wherein the step S344 includes: S3441, calculating the coordinates of eight intersection points of a preset number of FTIR field of view cones in space, thereby forming a three-dimensional geometric body of an overlapping area; S3442, taking each FTIR position coordinate as a starting point, emitting field rays according to the number of scanning points and the field angle, and processing to obtain the intersection of each ray and the three-dimensional geometric body; S3443, cutting the three-dimensional geometric body based on the grid lines formed by the intersection points with the largest surface density, and completing the three-dimensional grid division of the overlapping field of view; S345, making the FTIR plane scanning concentration path length result correspond to the overlapping area of ​​the field of view, dynamically allocating the concentration path length to each of the three-dimensional grids, and calculating the actual cloud concentration of each of the three-dimensional grids according to the grid thickness; S346, performing dynamic inversion of grid concentration using preset inversion logic; Wherein, the step S346 includes: S3461, when the concentration path length CL (M i,j,k ) is 0, then the concentration of the grid point is set to 0; S3462, when the concentration path length CL (M) of the grid point on the two FTIR lines of sight i,j,k ) are greater than 0, then the concentration path length CL1 (M i,j,k )=CL1 / N1, where CL1 is the total concentration path length on the FTIR1 line of sight, and N1 is the number of grids whose concentration path length on the FTIR1 line of sight is not equal to 0; S3463, traverse all points on the line of sight of FTIR1; S3464, let the concentration path length of point M on the FTIR2 line of sight be CL2 (M i,j,k ) = CL2 / N2; S3465, if the concentration path length of point M on the FTIR1 line of sight is long: CL1(M i,j,k ) is greater than the concentration path length CL2 (M) of point M on the FTIR2 line of sight i,j,k ), then: CL1(M i,j,k )=CL2(M i,j,k ), and update the concentration path length of other points on the FTIR1 line of sight except point M with the following logic: CL1(M else )+=(CL1(M i,j,k )-CL2(M i,j,k )) / (N1-1); S3466, traverse all the points on the line of sight of FTIR2, then CL(M i,j,k )=CL1(M i,j,k ), C(M i,j,k )=CL(M i,j,k ) / L(M i,j,k ), where L(M i,j,k ) is the path length of the point M along the line of sight of the FTIR1; S347, performing three-dimensional concentration distribution rendering of clouds; S5, using the preset main control device to process the gas type data and the scanning image according to infrared spectrum characteristics to obtain gas monitoring information, and using the preset alarm threshold to process the gas monitoring information to obtain gas leakage information and alarm; S6. Using the gas remote sensing equipment in the deployment area, according to the gas characteristics, identify and locate the gas leakage position; S7. Using the preset cloud push platform, according to the gas leakage information and the gas leakage device monitoring terminal, chemical park maintenance operations are performed.

2. A chemical park gas remote sensing alarm integration method according to claim 1, characterized in that: In the step S1, the position of the gas device includes: device height, device orientation and device distance.

3. A chemical park gas remote sensing alarm integration method according to claim 1, characterized in that: In the step S2, the gas types of each of the gas devices are counted and listed.

4. A chemical park gas remote sensing alarm integration method according to claim 1, characterized in that: The step S5 comprises: S51, processing to obtain a single gas alarm average value, and using it as the preset alarm threshold; S52, determining whether the gas monitoring information is higher than the preset alarm threshold; S53: If yes, generate gas leakage information and alarm according to the current gas monitoring information; S54: If not, filter out the gas monitoring information.

5. A chemical park gas remote sensing alarm integration method according to claim 1, characterized in that: In step S6, the number of gas devices can be marked according to the gas remote sensing equipment used, and leakage is located according to characteristic gases of different gas devices.

6. A chemical park gas remote sensing alarm integration method according to claim 1, characterized in that: The gas characteristics in step S6 include: infrared spectrum characteristics.

7. A chemical park gas remote sensing alarm integration system, used to execute a chemical park gas remote sensing alarm integration method according to any one of claims 1 to 6, characterized in that: The system comprises: A distribution map drawing module is used to record the gas devices in the park, to draw and mark the location of each of the gas devices, and to obtain a chemical park device distribution map; A gas type characteristic module, used to record the types of gas storage and gas production in each of the gas devices, and to search and obtain infrared spectrum characteristics from a preset database, wherein the types of gas storage and gas production are not less than 2; A reconstruction scanning imaging module is used to collect gas leakage detection demand data and obtain the number of equipment to layout the layout area of ​​the gas remote sensing equipment. When there are no less than two gas remote sensing equipment, the measured gas is positioned and the three-dimensional concentration is reconstructed to scan and obtain the scanning imaging of the target cloud. The reconstruction scanning imaging module is connected to the distribution map drawing module and the gas type feature module; A spectrum recognition module, used to classify and process the gas features in the scanning imaging by using spectrum matching and pattern recognition operations, so as to obtain and return gas type data to a preset main control device, and the spectrum recognition module is connected to the reconstruction scanning imaging module; An alarm module, used to use the preset main control device to process the gas type data and the scanning imaging according to the infrared spectrum characteristics to obtain gas monitoring information, and use the preset alarm threshold to process the gas monitoring information to obtain gas leakage information and alarm, the alarm module is connected with the gas type feature module, the reconstruction scanning imaging module and the spectrum recognition module; a leakage position locating module, used to identify and locate the gas leakage position according to the gas characteristics by using the gas telemetry equipment in the arrangement area, the leakage position locating module being connected to the alarm module; The information push module is used to utilize the preset cloud push platform to perform chemical park maintenance operations according to the gas leakage information and the gas leakage device monitoring terminal. The information push module is connected to the alarm module and the leakage position positioning module.

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