Multi-source fusion wide-range high-precision integrated detection device and method for pipeline dust concentration and temperature

Abstract

This invention relates to a multi-source fusion, wide-range, high-precision integrated device and method for detecting pipeline dust concentration and temperature, belonging to the field of dust safety risk monitoring and control technology. The device includes a temperature detection unit, an electrostatic induction dust concentration detection unit, a light absorption dust concentration detection unit, a light scattering dust concentration detection unit, a dust passage window, a laser source, and a laser beam demodulator. The method of this invention simultaneously integrates multiple methods such as electrostatic induction, light scattering, and light absorption, achieving a dust concentration detection range of 0-30 g / m³. 3 The system provides accurate detection of dust concentration over an ultra-wide range, and uses fiber optic temperature measurement to detect temperature in pipelines. This provides accurate data support to prevent pipeline dust explosions and environmental pollution, playing a crucial role in ensuring workplace safety and occupational health.

Description

Technical Field

[0001] This invention belongs to the field of dust safety risk monitoring and control technology, and relates to dust concentration and temperature detection technology in dust conveying pipelines. Specifically, it relates to a multi-source fusion wide-range high-precision integrated detection device and method for pipeline dust concentration and temperature. Background Technology

[0002] High concentrations of dust can explode under certain conditions, posing a significant explosion hazard in production, processing, transportation, and storage processes. Metal dust explosions have occurred frequently in recent years. Currently, the field of dust explosion hazards reveals many key problems, such as inaccurate monitoring, untimely early warning, and insufficient targeting of explosion-proof technologies. In response to the requirements of the new situation, it is urgent to conduct research on metal dust safety risk monitoring and control technologies.

[0003] Foreign countries began researching dust concentration detection technologies for pipelines in power plants and steel mills earlier, developing related dust monitoring technologies and products, which have been applied to areas such as plant flue gas emissions, power plant dust concentration control, and dust collector leak monitoring. However, according to explosion-proof regulations, these products are not suitable for typical industrial metal dust explosion-prone areas. Domestically, China Coal Technology & Engineering Group Chongqing Research Institute Co., Ltd. has been researching dust monitoring methods for explosive environments such as metal polishing and grinding sites since the 13th Five-Year Plan period, developing sensor detection technologies for both airborne and deposited dust, achieving an airborne dust concentration of 1000 mg / m³. 3 The error is 15%. Wuhan University of Technology conducted laboratory research on measuring high-concentration dust using fiber optic gratings, verifying the direct proportionality between extinction degree and dust concentration. Currently, the monitoring accuracy of large-range dust concentrations is low both domestically and internationally, making it difficult to support precise dust explosion prevention and control. For a range of 30000 mg / m³... 3 There is a lack of research on high-precision, intrinsically safe monitoring of ultra-high concentration industrial dust environments, as well as research on simultaneous monitoring of concentration and temperature and three-dimensional imaging technology. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a multi-source fusion wide-range high-precision integrated detection device and method for pipeline dust concentration and temperature, so as to realize the simultaneous detection of dust concentration and temperature in dust conveying pipelines.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-source fusion, wide-range, high-precision integrated pipeline dust concentration and temperature detection device is inserted into the pipeline for detection. The device includes a temperature detection unit (i.e., optical fiber 13), an electrostatic induction dust concentration detection unit (i.e., electrostatic induction electrode 2), a light absorption dust concentration detection unit (i.e., photodiode I 17), a light scattering dust concentration detection unit (i.e., photodiode II 4), a dust passage window 16, a laser emitter 14, a laser source and laser beam demodulator 12, and a signal processing and controller 11.

[0007] Temperature detection: The laser emitted from the signal processing and controller 11 is input into the dust passage window 16 through the laser source and laser beam demodulator 12. Temperature detection is achieved based on the Durag fiber optic thermometry method. The temperature measurement signal is reflected in the temperature detection unit (i.e., fiber optic 13) and input to the signal processing and controller 11 through the laser source and laser beam demodulator 12 to achieve temperature detection.

[0008] Dust concentration detection: Dust in the pipeline diffuses with the airflow; the dust concentration test range is 0-30 g / m³. 3 This enables accurate detection of dust over a wide range.

[0009] Electrostatic induction method: When dust diffuses through the detection device, the dust concentration is detected by electrostatic induction on the surface of the device. As dust passes near the electrostatic induction dust concentration detection unit (electrostatic induction electrode 2), a wave signal is induced on the unit (electrostatic induction electrode 2). The amplitude of the wave signal characterizes the dust concentration. This method is primarily used to test medium-concentration dust (1 g / m³). 3 -10g / m 3 ;

[0010] Optical absorption method: When dust passes through the dust passage window 16, the laser beam emitted by the laser emitter 14 illuminates the optical absorption dust concentration detection unit (photodiode I 17) through the dust passage window 16. The dust scatters and absorbs this beam. The surface of the optical absorption dust concentration detection unit (photodiode I 17) receives the signal after the dust particles absorb the laser. The test method is optical absorption, which is used to test high-concentration dust with a test range of 10 g / m³. 3 -30g / m 3 ;

[0011] Light scattering method: The dust concentration detection unit (photodiode II4) receives the scattered signal from dust particles. The testing method is light scattering, which is used to test low-concentration dust, with a testing range of 0-1000 mg / m³. 3 ;

[0012] By integrating electrostatic induction, optical absorption, and light scattering methods, the simultaneous detection and analysis of these three signals achieves a range of 0-30 g / m³. 3 Accurate detection of high concentrations of dust.

[0013] Preferably, the electrostatic induction dust concentration detection unit (electrostatic induction electrode 2), the light scattering dust concentration detection unit (photodiode II 4), and the light absorption dust concentration detection unit (photodiode I 17) are all connected to the signal processing and controller 11; the laser emitting head 14 is connected to the signal processing and controller 11 through the laser source and the laser beam demodulator 12.

[0014] Preferably, the electrostatic induction dust concentration detection unit (electrostatic induction electrode 2) is covered on the surface of the insulating carrier 1, and the dust passage window 16 is disposed inside the insulating carrier 1; the light scattering dust concentration detection unit (photodiode II 4), the light absorption dust concentration detection unit (photodiode I 17), and the laser emitting head 14 are all disposed on the side of the dust passage window 16, wherein the light scattering dust concentration detection unit (photodiode II 4) is disposed at the end closer to the laser emitting head 14, and the light absorption dust concentration detection unit (photodiode I 17) is disposed on the opposite side of the laser emitting head 14.

[0015] Preferably, the dust is connected to an air compressor through window 16 to protect photodiode I17 and photodiode II4 from dust contamination, enabling the equipment to accurately detect dust concentration over long-term operation.

[0016] Preferably, the signal processing flow of the signal processing and controller 11 is as follows:

[0017] First, the parameters are initialized. Based on the Durlag fiber optic temperature measurement principle, the ambient temperature is detected by the offset of the reflected wave wavelength. Dust concentration detection integrates electrostatic induction, light absorption, and light scattering methods. The electrostatic induction dust concentration detection unit obtains the induced signal generated by dust, and the dust concentration is detected by analyzing the fluctuation intensity of the induced signal. Formula S1 is used to characterize the dust concentration by the fluctuation intensity of the induced signal, achieving accurate detection of medium-concentration dust, with a testing range of 1 g / m³-10 g / m³. Simultaneously, a laser is emitted, and the dust... When dust passes through a laser beam, it undergoes scattering and absorption. High-concentration dust is detected by analyzing the decrease in surface light intensity of the dust concentration detection unit using the light absorption method, and high-concentration dust is characterized using formula S2. Low-concentration dust is detected by analyzing the increase in surface light intensity of the dust concentration detection unit using the light scattering method, and low-concentration dust is characterized using formula S3. Finally, the electrostatic induction signal, light absorption signal, and light scattering signal are fused according to the fusion algorithm to automatically determine the boundaries of high, medium, and low dust concentrations, achieving accurate detection of dust concentration across the entire range.

[0018] The electrostatic induction signal is collected as a = [a1, a2, a3, ..., a n The light absorption signal collected is b=[b1,b2,b3,……,b] n The collected light scattering signal is c=[c1,c2,c3,……,c n ];

[0019]

[0020]

[0021]

[0022] in, S 1 represents the concentration of medium-concentration dust measured by electrostatic induction. S 2 represents the concentration of high-concentration dust measured by optical absorption method. S 3 represents the low-concentration dust concentration measured by light scattering method, and k1, k2, and k3 are correction factors. n Indicates the number of signals collected;

[0023] Fusion Algorithm: Since the detection device needs to automatically identify the boundary during the testing process, an automatic boundary identification algorithm was designed to achieve the fusion of the three methods.

[0024] Step 1: Set the values ​​of S1, S2, and S3 within the range of 0-30000 mg / m³ 3 Normalization within the range, the normalized values ​​are respectively as follows: , , ;

[0025]

[0026]

[0027]

[0028] Step 2: Select the discriminant formula for the data;

[0029] The maximum value of the three data increments is used as the criterion for data selection, as shown in the following formula:

[0030]

[0031] By judgment , , The maximum positive increment is used as the selection data for dust concentration output;

[0032] Step 3: Secondary calibration of the data;

[0033] Dust concentration Z is:

[0034]

[0035] Where k is the calibration coefficient.

[0036] The beneficial effects of this invention are as follows: the device of this invention can simultaneously detect dust concentration and temperature in dust conveying pipelines, and is small in size, lightweight, and easy to install, greatly realizing multi-parameter detection in narrow pipeline spaces. Furthermore, the integration of electrostatic induction, light scattering, and light absorption methods achieves a detection range of 0-30 g / m³. 3 The accurate detection of ultra-wide dust concentration provides precise data support for preventing pipeline dust explosions and environmental pollution, playing a crucial role in ensuring workplace safety and occupational health.

[0037] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0039] Figure 1 This is a schematic diagram of the integrated dust concentration and temperature detection device of the present invention;

[0040] Figure 2 This is a schematic diagram of the installation of the integrated dust concentration and temperature detection device of the present invention inserted into a pipeline;

[0041] Figure 3 This is a flowchart of the signal processing of the integrated dust concentration and temperature detection device of the present invention.

[0042] Reference numerals in the attached diagram: 1-Insulating carrier, 2-Electrostatic induction electrode, 3-Compressed air transmission pipeline, 4-Photodiode II, 5-Sensor end cap, 6-Air compressor, 7-Electrostatic induction signal transmission line, 8-Photodiode I signal transmission line, 9-Photodiode II signal transmission line, 10-Temperature signal transmission line, 11-Signal processing and controller, 12-Laser source and laser beam demodulator, 13-Fiber optic cable, 14-Laser emitter head, 15-Condenser lens, 16-Dust passage window, 17-Photodiode I. Detailed Implementation

[0043] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0044] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0045] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0046] Please see Figures 1-3 This invention provides a multi-source fusion, wide-range, high-precision integrated detection device for pipeline dust concentration and temperature. The entire device has a relatively complex structure, and the entire structure is inserted into the pipeline. The installation method is as follows: Figure 2 As shown, the structural schematic diagram of the device is as follows: Figure 1 As shown.

[0047] The entire device structure includes: 1. Insulating carrier (material: polytetrafluoroethylene), 2. Electrostatic induction electrode (material: H62 copper), 3. Compressed air transmission pipeline, 4. Photodiode II, 5. Sensor end cap, 6. Air compressor, 7. Electrostatic induction signal transmission line (electrostatic induction method), 8. Photodiode I signal transmission line (light absorption method), 9. Photodiode II signal transmission line (light scattering method), 10. Temperature signal transmission line (fiber optic temperature measurement method), 11. Signal processing and controller, 12. Laser and laser beam demodulator, 13. Optical fiber, 14. Laser emitter, 15. Condenser lens, 16. Dust passage window, 17. Photodiode I.

[0048] (1) Temperature detection:

[0049] The laser emitted from the signal processing and controller 11 is input into the device through the laser source and laser beam demodulator 12. Temperature detection is achieved based on the Durrag fiber optic thermometry method. The temperature measurement signal is reflected in the optical fiber and input into the signal processing and controller 11 through the laser source and laser beam demodulator 12 to achieve temperature detection.

[0050] (2) Dust concentration detection

[0051] Dust in the pipeline diffuses with the airflow, with a dust concentration test range of 0-30 g / m³. 3 This system enables accurate detection of dust over a wide range. As dust diffuses through the detection equipment, its concentration is detected by electrostatic induction on the detector surface. When dust passes near the electrostatic induction electrode, a wave signal is induced on the electrode. The amplitude of this wave signal characterizes the dust concentration. It primarily tests medium-concentration dust (1 g / m³). 3 -10g / m 3 When dust passes through the window, the laser beam emitted by the laser emitter 14 shines onto the photodiode I17 through the window. The dust scatters and absorbs this beam. The surface of photodiode I17 receives the signal after the dust particles absorb the laser light. The test method is the optical absorption method, which is used to test high-concentration dust with a test range of 10 g / m³. 3 -30g / m 3 The photodiode II4 receives the scattered signal from dust particles. The testing method used is light scattering, and it is applied to low-concentration dust particles, with a testing range of 0-1000 mg / m³. 3 By integrating electrostatic induction, optical absorption, and light scattering methods, the simultaneous detection and analysis of these three signals achieves a range of 0-30 g / m³. 3 Accurate detection of high concentrations of dust.

[0052] Signal processing flow, such as Figure 3 As shown.

[0053] First, the parameters are initialized. Then, the electrostatic induction electrode 2 obtains the induced signal of dust generation. The dust concentration is detected by analyzing the fluctuation intensity of the induced signal. Formula S1 is used to characterize the dust concentration by the fluctuation intensity of the induced signal, achieving accurate detection of medium-concentration dust. The test range is 1 g / m³. 3 -10g / m 3Simultaneously, a laser of a specific wavelength is emitted. Based on the Durlag fiber optic thermometry principle, the ambient temperature is detected by the shift in the reflected wavelength, and the temperature is characterized using formula S3. Dust particles undergo scattering and absorption when passing through the laser beam. High-concentration dust is detected by analyzing the reduction in light intensity on the surface of photodiode I17, and the high-concentration dust is characterized using formula S2. The test range is 10 g / m³. 3 -30g / m 3 Low-concentration dust was detected by analyzing the increase in light intensity on the surface of photodiode II4. Low-concentration dust was characterized using formula S1, with a test range of 0-1000 mg / m³. 3 Finally, the electrostatic induction signal, light absorption signal, and light scattering signal are fused together using a fusion algorithm to automatically determine the boundaries between high, medium, and low dust concentrations, thereby achieving accurate detection of dust concentration across the entire range.

[0054] The electrostatic induction signal is collected as a = [a1, a2, a3, ..., a n The light absorption signal collected is b=[b1,b2,b3,……,b] n The collected light scattering signal is c=[c1,c2,c3,……,c n ];

[0055]

[0056]

[0057]

[0058] in, S 1 represents the concentration of medium-concentration dust measured by electrostatic induction. S 2 represents the concentration of high-concentration dust measured by optical absorption method. S 3 represents the low-concentration dust concentration measured by light scattering method, and k1, k2, and k3 are correction factors. n Indicates the number of signals collected;

[0059] Fusion Algorithm: Since the detection device needs to automatically identify the boundary during the testing process, an automatic boundary identification algorithm was designed to achieve the fusion of the three methods.

[0060] Step 1: Set the values ​​of S1, S2, and S3 within the range of 0-30000 mg / m³ 3 Normalization within the range, the normalized values ​​are respectively as follows: , , ;

[0061]

[0062]

[0063]

[0064] Step 2: Select the discriminant formula for the data;

[0065] The maximum value of the three data increments is used as the criterion for data selection, as shown in the following formula:

[0066]

[0067] By judgment , , The maximum positive increment is used as the selection data for dust concentration output;

[0068] Step 3: Secondary calibration of the data;

[0069] Dust concentration Z is:

[0070]

[0071] Where k is the calibration coefficient.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-source fusion, wide-range, high-precision integrated detection method for pipeline dust concentration and temperature, wherein the detection device is inserted into the pipeline for detection, characterized in that... The device includes a temperature detection unit, an electrostatic induction dust concentration detection unit, a light absorption dust concentration detection unit, a light scattering dust concentration detection unit, a dust passing window (16), a laser source and laser beam demodulator (12), and a signal processing and controller (11). Temperature detection: A laser beam of a certain wavelength emitted from the laser source and laser beam demodulator (12) is input into the dust passage window (16) through the laser fiber (13). Temperature detection is achieved based on the Durag fiber thermometry method. The temperature measurement signal is reflected in the temperature detection unit and input to the signal processing and controller (11) through the laser source and laser beam demodulator (12) to achieve temperature detection. Dust concentration detection: Electrostatic induction method: When dust diffuses through the window (16), an alternating signal is induced on the surface of the electrostatic induction electrode (2) based on the principle of electrostatic induction. The alternating signal is transmitted to the signal processing and controller (11) through the electrostatic induction signal output line (7). The alternating signal is collected and processed to characterize the dust concentration. Optical absorption method: When dust passes through the dust passage window (16), the laser beam emitted by the laser emitter (14) irradiates the dust particles passing through the dust passage window (16), and the dust absorbs this beam. The surface of the dust concentration detection unit receives the signal after the dust particles absorb the laser beam. The test method based on this method is optical absorption method to test high concentration dust. Light scattering method: When dust passes through the dust passage window (16), the laser beam emitted by the laser emitter (14) irradiates the dust particles passing through the dust passage window (16). In addition to light absorption, the dust particles also scatter the laser beam. The dust concentration detection unit of the light scattering method receives the scattering signal of the dust particles. The test method based on this method is the light scattering method, which is used to test low concentration dust. By integrating three methods—electrostatic induction, optical absorption, and light scattering—and simultaneously detecting and analyzing the three signals, accurate detection of high-concentration dust can be achieved. The signal processing flow of the signal processing and controller (11) is as follows: First, the parameters are initialized. Based on the Durlag fiber optic temperature measurement principle, the ambient temperature is detected by the offset of the reflected wave wavelength. Dust concentration detection integrates electrostatic induction, light absorption, and light scattering methods. The electrostatic induction dust concentration detection unit obtains the induced signal generated by dust, and the dust concentration is detected by analyzing the fluctuation intensity of the induced signal. Formula S1 is used to characterize the dust concentration by the fluctuation intensity of the induced signal, achieving accurate detection of medium-concentration dust within a test range of 1 g / m³. 3 -10g / m 3 Simultaneously, a laser is emitted. When dust passes through the laser beam, it undergoes scattering and absorption. High-concentration dust is detected by analyzing the decrease in surface light intensity of the dust concentration detection unit using the light absorption method, and high-concentration dust is characterized using formula S2. Low-concentration dust is detected by analyzing the increase in surface light intensity of the dust concentration detection unit using the light scattering method, and low-concentration dust is characterized using formula S3. Finally, the electrostatic induction signal, light absorption signal, and light scattering signal are fused according to the fusion algorithm to automatically determine the boundaries of high, medium, and low dust concentrations, achieving accurate detection of dust concentration across the entire range. The electrostatic induction signal is collected as a = [a1, a2, a3, ..., a n The light absorption signal collected is b=[b1,b2,b3,……,b] n The collected light scattering signal is c=[c1,c2,c3,……,c n ]; in, S 1 represents the concentration of medium-concentration dust measured by electrostatic induction. S 2 represents the concentration of high-concentration dust measured by optical absorption method. S 3 represents the low-concentration dust concentration measured by light scattering method, and k1, k2, and k3 are correction factors. n Indicates the number of signals collected; Fusion Algorithm: Step 1: Set the values ​​of S1, S2, and S3 within the range of 0-30000 mg / m³ 3 Normalization within the range, the normalized values ​​are respectively as follows: , , ; Step 2: Select the discriminant formula for the data; The maximum value of the three data increments is used as the criterion for data selection, as shown in the following formula: By judgment , , The maximum positive increment is used as the selection data for dust concentration output; Step 3: Secondary calibration of the data; Dust concentration Z is: Where k is the calibration coefficient.

2. The integrated detection method for wide-range, high-precision pipeline dust concentration and temperature according to claim 1, characterized in that, The electrostatic induction dust concentration detection unit, the light scattering dust concentration detection unit, and the light absorption dust concentration detection unit are all connected to the signal processing and controller (11) to realize wide-range and high-precision online dust concentration detection; the laser source and laser beam demodulator (12) are connected to the signal processing and controller (11) to realize online temperature detection.

3. The integrated detection method for wide-range, high-precision pipeline dust concentration and temperature according to claim 1 or 2, characterized in that, The electrostatic induction dust concentration detection unit is covered on the surface of the insulating carrier (1), and the dust passes through the window (16) and is set inside the insulating carrier (1); the light scattering dust concentration detection unit, the light absorption dust concentration detection unit and the laser emitting head (14) are all set on the side of the dust passing through the window (16), wherein the light scattering dust concentration detection unit is set at the end close to the laser emitting head (14), and the light absorption dust concentration detection unit is set on the opposite side of the laser emitting head (14).

4. The integrated detection method for wide-range, high-precision pipeline dust concentration and temperature according to claim 3, characterized in that, The dust is connected to an air compressor through a window (16) to protect photodiode 1 (17) and photodiode II (4) from dust contamination, so that the equipment can achieve accurate detection of dust concentration during long-term operation.

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