Hazardous chemical substance cabinet explosion-proof performance detection system based on aerosol test and detection method thereof

Abstract

The invention relates to a hazardous chemical substance cabinet explosion-proof performance detection system based on an aerosol test and a detection method thereof, and belongs to the technical field of hazardous chemical substance cabinet detection.The hazardous chemical substance cabinet explosion-proof performance detection system comprises a detection control platform, an aerosol supply module, an environment simulation module, an ignition trigger module, a multi-modal data acquisition module, a sealing performance verification module and a hazardous chemical substance cabinet to be detected; the detection control platform comprises a main controller, a data acquisition unit, a human-computer interaction interface and a data storage and processing unit and is a central control and data processing core of the system, and the aerosol supply module is communicated with an inner cavity of the to-be-detected hazardous chemical substance cabinet through a pipeline. According to the invention, the assessment dimension is comprehensive and is close to the actual working condition, the structural integrity and explosion suppression performance of the cabinet body under the combined action of the explosion shock wave and the flame load can be comprehensively assessed by simulating the internal explosion and synchronously acquiring the pressure and image data, the assessment dimension is more comprehensive, and the result can better reflect the real explosion-proof capability of the cabinet body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hazardous chemical cabinet detection, in particular to a hazardous chemical cabinet explosion-proof performance detection system based on aerosol testing and a detection method thereof. BACKGROUND

[0002] The hazardous chemical storage cabinet is a key equipment for safely storing flammable and explosive chemicals in laboratories, petrochemicals, pharmaceuticals and other fields, and its explosion-proof performance is directly related to the safety of personnel and property. At present, the evaluation and detection technology of the safety performance of such equipment mainly has the following limitations: Firstly, the existing detection methods are mostly static index detection, such as testing the cabinet bearing capacity by a universal material testing machine and verifying the sealing by a gas leakage detector. However, these static tests cannot fully evaluate the bearing and inhibition capacity of the cabinet to dynamic effects such as explosion overpressure, pressure rise rate and flame propagation when internal flammable gas or aerosol explodes. Explosion is a violent release of energy and pressure in a very short time, and its destruction mode is fundamentally different from static load. The existing detection system has obvious gaps in this regard.

[0003] Secondly, the existing technology lacks special, quantifiable and repeatable explosion simulation test means for the explosion-proof performance of hazardous chemical cabinets. Some advanced intelligent control technologies, such as explosion-proof safety cabinet control systems based on deep learning, aim to respond and intervene in the hazards that have occurred or are about to occur in the cabinet, which belongs to "after" or "during" control, rather than "before" active and standardized detection and certification of the explosion-proof performance limit of the cabinet itself.

[0004] Although there are some explosion test methods in the existing technology, such as dust explosion test for evaluating flammability or drum test for testing aerosol flammability, these methods are not designed specifically for the overall explosion-proof performance evaluation of hazardous chemical storage cabinets and cannot be directly applied to the test of finished cabinet bodies. In addition, some explosion-proof monitoring devices can only perform safety monitoring in explosive environments, but not explosion-proof performance testing of the cabinet itself.

[0005] Therefore, there is an urgent need in the art for a hazardous chemical cabinet explosion-proof performance detection system and method that can safely, reliably and quantitatively simulate the aerosol explosion environment inside the hazardous chemical cabinet and comprehensively evaluate its explosion-proof performance. Aerosol is used as the explosion simulation medium, which is safe, easy to control and has good repeatability, and is particularly suitable for standardized and quantitative explosion-proof performance certification testing of finished cabinet bodies. SUMMARY

[0006] The application provides a dangerous chemical cabinet explosion-proof performance detection system based on aerosol testing and a detection method thereof, and solves the problem that the existing dangerous chemical cabinet explosion-proof performance detection technology cannot perform dynamic explosion-proof performance testing on the dangerous chemical cabinet, and realizes standardized and quantitative explosion-proof performance detection of the explosion-proof performance of the dangerous chemical cabinet.

[0007] The application solves the above technical problems in the following manner: a dangerous chemical cabinet explosion-proof performance detection system based on aerosol testing, comprising a detection control platform, an aerosol supply module, an environment simulation module, an ignition trigger module, a multi-modal data acquisition module, a sealing verification module, and a dangerous chemical cabinet to be tested, wherein the detection control platform comprises a main controller, a data acquisition unit, a man-machine interface, and a data storage and processing unit, and serves as the central control and data processing core of the system: The aerosol supply module is connected to the internal cavity of the dangerous chemical cabinet to be tested through a pipeline, and comprises an aerosol generating device, a conveying pipeline, a circulating fan, and a concentration sensor. The environment simulation module comprises a temperature sensor, a humidity sensor, a heater, and a humidifier, and the temperature sensor and the humidity sensor are arranged in the internal cavity of the dangerous chemical cabinet to be tested. The ignition trigger module comprises an igniter and a trigger circuit, and is arranged in the internal cavity of the dangerous chemical cabinet to be tested. The multi-modal data acquisition module comprises a pressure sensor array and a high-speed camera, and both of them are used for data acquisition of the internal explosion area of the dangerous chemical cabinet to be tested. The sealing verification module is connected to the internal cavity of the dangerous chemical cabinet to be tested, and comprises a high-precision pressure sensor and a clean air supply device. The detection control platform is connected to the aerosol supply module, the environment simulation module, the ignition trigger module, the multi-modal data acquisition module, and the sealing verification module through a cable or an optical fiber communication link.

[0008] On the basis of the above technical solution, the application can be further improved as follows.

[0009] Further, the main controller is a programmable logic controller (PLC) or an industrial computer, which is used for executing test logic and coordinating the modules; the data acquisition unit is a multi-channel high-speed analog and digital acquisition card, which is used for receiving signals from the sensors; the man-machine interface is a touch screen or a computer graphical interface, which is used for parameter setting, process monitoring, and result display; and the data storage and processing unit is used for storing original data and calculating explosion-proof performance evaluation indexes through built-in algorithms, thereby improving the control accuracy and interactive convenience of the entire detection system, and providing a complete software and hardware foundation for subsequent data analysis and report generation.

[0010] Further, the aerosol generator atomizes the liquid combustible agent into an aerosol state, the liquid combustible agent including but not limited to isopropyl alcohol, ethanol, n-hexane, the delivery pipeline is made of anti-static material and can be reliably grounded, connecting the aerosol generator and the hazardous chemical cabinet to be tested, the circulating fan is installed in the hazardous chemical cabinet to be tested, promoting the uniform distribution of aerosol, the concentration sensor monitors the aerosol concentration in the cabinet in real time and feeds back to the detection control platform, the concentration sensor and the aerosol generator constitute a closed-loop feedback system, and the aerosol concentration is dynamically adjusted to the preset value through the PID control algorithm, which can safely and uniformly generate and maintain a specific aerosol test environment in the cabinet, wherein the anti-static pipeline prevents the risk of static ignition, and the closed-loop PID control system composed of the aerosol generator and the concentration sensor realizes automatic and accurate adjustment of the concentration, greatly improving the consistency, repeatability and control accuracy of the test conditions, thereby ensuring the reliability and comparability of the test results.

[0011] Further, the detection control platform controls the working state of the heater and the humidifier according to the readings of the temperature sensor and the humidity sensor, so that the environment in the cabinet is stabilized at the preset temperature and humidity target value, and the heater or the humidifier is automatically driven to work by the detection control platform according to the preset temperature and humidity target value, forming a closed-loop control loop, which can quickly and accurately stabilize the environment in the cabinet at the conditions required by the simulation of real working conditions or specific test standards, ensuring the consistency of different batches of test environment factors and enhancing the persuasiveness of the test conclusion.

[0012] Further, the igniter is at least one, which is electric spark type or high temperature wire type, arranged in the center or corner of the cabinet according to test requirements, the trigger circuit is connected with the igniter and receives the trigger instruction from the detection control platform, the trigger instruction is transmitted through an isolated optical fiber communication link, supporting multi-point synchronous triggering or sequence triggering according to a preset time sequence, providing a flexible configuration (point, number, time sequence) and safe and reliable remote ignition solution, transmitting the trigger instruction through an isolated optical fiber communication link, which not only meets the flexibility requirements of the test scheme for explosion form simulation, but also effectively ensures the safety of the control end equipment and the operator through electrical isolation, avoiding potential interference and harm of high-energy ignition circuit to weak current control system.

[0013] Further, the pressure sensor array is composed of not less than three high-frequency dynamic pressure sensors, which are installed on the inner wall of the cabinet in a spatially distributed manner, and the sampling rate of a single sensor is not less than 100 kHz. The dangerous chemical product cabinet to be tested is provided with a cabinet door, and the cabinet door is provided with an explosion-proof window. The high-speed camera observes the flame propagation process in the cabinet through the explosion-proof window, and the acquisition frame rate is not less than 1000 frames / second. The pressure sensor array and the high-speed camera are started simultaneously by the synchronization signal sent by the detection control platform, and the explosion pressure waveform and the flame development image are recorded respectively. The high-frequency pressure sensor array captures the dynamic change of pressure at the moment of explosion, and the high-speed camera records the visual process of flame propagation through the explosion-proof window. Both are triggered by the same synchronization signal, ensuring that the collected pressure data and image data are strictly synchronized in time, providing accurate space-time correspondence for subsequent analysis of the correlation between explosion parameters (such as pressure rise rate) and flame development characteristics, and realizing multi-dimensional and fine evaluation of the explosion-proof performance.

[0014] Further, the detection control platform controls the clean air supply device to charge the cabinet to a predetermined positive pressure of 1.0 kPa to 2.5 kPa, and then closes the air source. The leakage rate is calculated by monitoring the pressure decay curve of the high-precision pressure sensor. The clean air charging and cutting are automatically controlled by the detection control platform, and the leakage rate is automatically calculated based on the pressure decay data monitored by the high-precision pressure sensor. The sealing verification is standardized and quantified, avoiding errors caused by manual operation and interpretation, and ensuring that the cabinet to be tested meets the basic sealing integrity requirements before subsequent explosion testing, thereby ensuring the effectiveness of the test from the source.

[0015] Further, the high-precision pressure sensor is arranged in the cabinet for measuring the small pressure change in the cabinet. The clean air supply device is in communication with the cabinet for charging clean air into the cabinet to be tested to establish an initial positive pressure. The initial test pressure is established by the clean air supply device, and the small change of the pressure is sensed by the high-precision pressure sensor, thereby providing an accurate pressure source and measurement tool for quantitative evaluation of the sealing performance by using the differential pressure method, so that small leaks can be reliably detected, thereby ensuring the accuracy and authority of the sealing verification result.

[0016] A dangerous chemical product cabinet explosion-proof performance detection method based on aerosol testing, comprising the following steps: S1, system self-checking and cabinet sealing verification step, self-checking each module of the detection system, and quantitatively evaluating the sealing performance of the dangerous chemical product cabinet to be tested by using the differential pressure method; S2, cabinet environment simulation step, adjusting and stabilizing the temperature and humidity in the cabinet to the preset target value by the environment simulation module; S3: aerosol injection and concentration balancing step, injecting flammable aerosol into the cabinet by the aerosol generating device, and through the closed loop feedback system composed of the aerosol generating device and the concentration sensor, the aerosol concentration in the cabinet reaches and stabilizes at the preset concentration; S4, ignition trigger and multi-modal data synchronous acquisition step, after confirming the concentration balance, remotely triggering at least one igniter, and synchronously starting the pressure sensor array and the high-speed camera to collect explosion pressure waveform and flame propagation image; S5, data processing and explosion-proof performance evaluation step, processing the collected pressure data and image data, calculating the maximum explosion pressure, the maximum pressure rise rate and the flame propagation speed by algorithm, and comprehensively evaluating the structural integrity of the cabinet to generate a test report; The data processing specifically includes: calculating the first derivative after smoothing filtering the pressure-time curve, finding the maximum value of the derivative in the explosion rising segment as the maximum pressure rise rate; image processing of high-speed image sequence, including color space conversion, binarization (preferably Otsu method), morphological operation and contour recognition, determining the flame front peak position and calculating the displacement between consecutive frames, combining the frame rate and the calibration scale to obtain the flame propagation speed sequence, taking the maximum value as the evaluation index, converting the transient and complex physical phenomena in the explosion process into objective and comparable numerical indicators, so that the evaluation of the explosion-proof performance of the cabinet is improved from subjective qualitative judgment to objective quantitative analysis, and the accuracy of the test report is significantly improved.

[0017] The beneficial effects of the present application are: the present application provides a dangerous chemical product cabinet explosion-proof performance detection system and method based on aerosol test, which has the following advantages: 1. Comprehensive evaluation dimension, close to actual working conditions, by simulating internal explosion and synchronously collecting pressure and image data, the structural integrity and explosion suppression performance of the cabinet under the combined action of explosion shock wave and flame load can be comprehensively evaluated, the evaluation dimension is more comprehensive, and the result can better reflect the real explosion-proof ability of the cabinet.

[0018] 2. The detection result is objective, accurate and quantifiable, based on high-precision sensors and high-speed acquisition equipment, combined with standardized data processing algorithms, and finally outputting key performance indicators in the form of specific numerical values, which eliminates the subjectivity of human judgment, makes the detection result highly objective, accurate and comparable, and is very suitable for product certification and performance grading.

[0019] 3. Good test consistency, from sealing verification, environment simulation, concentration balancing to ignition triggering and data acquisition, the whole process is automatically controlled by the detection control platform, which maximally reduces human operation errors, ensures the high consistency of test conditions and processes at different times and different batches, and greatly improves the reliability and repeatability of test results.

[0020] 4. High safety and reliability. The aerosol medium reduces the overall risk, the anti-static pipeline design prevents accidental ignition, the isolated optical fiber communication used for ignition triggering ensures control safety, the test system and the to-be-tested cabinet are placed in an explosion-proof test cabin or equipped with a safety pressure relief device, and these designs jointly build a solid safety barrier to ensure the safety and controllability of the test process itself. 5. By combining the closed-loop PID concentration control in the aerosol supply module with the synchronous triggering of the multi-modal data acquisition module, the first quantifiable and repeatable dynamic explosion performance test in the hazardous chemical cabinet detection field is realized.

[0021] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, and to implement the content of the description, the following will be described in detail with the preferred embodiments of the present application and the accompanying drawings. The specific embodiments of the present application are given in detail by the following examples and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A structure diagram of a hazardous chemical cabinet explosion-proof performance detection system and a detection method based on aerosol testing according to an embodiment of the present application; Figure 2 A front view of a hazardous chemical cabinet explosion-proof performance detection system and a detection method based on aerosol testing according to an embodiment of the present application; Figure 3 A system architecture diagram of a hazardous chemical cabinet explosion-proof performance detection system and a detection method based on aerosol testing according to an embodiment of the present application; Figure 4 A method flowchart of a hazardous chemical cabinet explosion-proof performance detection system and a detection method based on aerosol testing according to an embodiment of the present application.

[0023] In the drawings, the component list represented by each number is as follows: 1, detection control platform; 101, main controller; 102, data acquisition unit; 103, human-computer interaction interface; 2, aerosol supply module; 201, aerosol generating device; 202, conveying pipeline; 203, circulating fan; 204, concentration sensor; 3, environment simulation module; 301, temperature sensor; 302, humidity sensor; 303, heater; 304, humidifier; 4, ignition trigger module; 401, igniter; 402, trigger circuit; 5, multi-modal data acquisition module; 501, pressure sensor array; 502, high-speed camera; 6, sealing verification module; 601, high-precision pressure sensor; 602, clean air supply device; 7, hazardous chemical product cabinet to be tested. DETAILED DESCRIPTION

[0024] The principles and features of the present application are described, and the examples are only used to explain the present application, and are not used to limit the scope of the present application. In the following paragraphs, the present application is described in more detail with reference to the accompanying drawings. According to the following description, the advantages and features of the present application will be more apparent. It should be noted that the drawings are very simplified and use non-precise proportions, only for the purpose of facilitating and clearly assisting the description of the embodiments of the present application. Figures 1-4 It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. When a component is referred to as "disposed on" another component, it can be directly disposed on the other component or there can be a middle component. The terms "vertical", "horizontal", "left", "right" and the like used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] As

[0027] Figures 1-4 ​As shown, the present application provides an aerosol test-based hazardous chemical cabinet explosion-proof performance detection system and its detection method, which comprises a detection control platform 1, an aerosol supply module 2, an environment simulation module 3, an ignition trigger module 4, a multi-modal data acquisition module 5 and a sealing verification module 6. These modules work together to complete the explosion-proof performance detection of the hazardous chemical cabinet 7. The hazardous chemical cabinet 7 to be tested and all the detection modules placed inside it (including circulating fans, concentration sensors, temperature sensors, humidity sensors, igniters and pressure sensor arrays) should be placed in an explosion-proof test cabin with pressure relief and explosion function. The explosion-proof test cabin should be able to withstand the maximum expected explosion pressure and be equipped with an automatic fire extinguishing and explosion suppression system to ensure the absolute safety of the outside during the test process. The detection control platform 1 comprises a main controller 101, a data acquisition unit 102 and a human-computer interaction interface 103. The main controller 101 can adopt an industrial-grade PLC or an embedded industrial computer, responsible for coordinating the working time sequence of each module. The data acquisition unit 102 is responsible for collecting data from various sensors, including pressure, temperature, humidity, aerosol concentration, etc. The human-computer interaction interface 103 is a touch screen or computer interface, used for parameter setting, test process monitoring and result display. The aerosol supply module 2 comprises an aerosol generating device 201, a delivery pipeline 202, a circulating fan 203 and a concentration sensor 204. The aerosol generating device 201 can atomize liquid flammable substances (such as isopropyl alcohol) into aerosol state. The delivery pipeline 202 is made of anti-static material and is reliably grounded, connecting the aerosol generating device 201 and the inside of the hazardous chemical cabinet 7 to be tested. The circulating fan 203 is used to promote the uniform distribution of aerosol in the cabinet. The concentration sensor 204 monitors the aerosol concentration in the cabinet in real time and feeds back the data to the detection control platform 1, forming a PID closed-loop control system. The environment simulation module 3 comprises a temperature sensor 301, a humidity sensor 302, a heater 303 and a humidifier 304. These components work together to adjust and stabilize the temperature and humidity in the cabinet to the preset target value, simulating different environmental conditions. The ignition trigger module 4 comprises at least one igniter 401 and a corresponding trigger circuit 402. The igniter 401 can use electric spark ignition or high-temperature wire ignition method and is installed at the key position in the cabinet. The trigger circuit 402 is connected with the detection control platform 1 through an isolated optical fiber communication link, ensuring the safe and reliable transmission of ignition instructions. The multi-modal data acquisition module 5 includes a pressure sensor array 501 and a high-speed camera 502, the pressure sensor array 501 is composed of a plurality of high-frequency pressure sensors (a sampling rate is not less than 100 kHz), which are distributed at different positions in the cabinet and used for recording pressure changes in the explosion process, in order to ensure the survivability and data accuracy in the explosion test, a single sensor should have a range of not less than 2.0 MPa, a sampling rate of not less than 100 kHz, and be equipped with a high-temperature-resistant metal protective cover to resist the direct impact of explosion flame and fragments, the acquisition frame rate of the high-speed camera 502 is not less than 1000 frames / s, which is used for capturing the flame propagation process through the explosion-proof window, a protective lens can be installed in front of the lens, and the high-speed camera 502 is operated through remote control to ensure the safety of personnel and equipment; The sealing verification module 6 includes a high-precision pressure sensor 601 and a clean air supply device 602, the high-precision pressure sensor 601 is used for measuring the small pressure change in the cabinet, and the clean air supply device 602 is used for filling clean air into the cabinet to establish the initial pressure required for the test; Considering that the explosion environment may cause pollution or loss to the sensing elements, the sensors should be calibrated and checked after each or regular test, and the igniter is regarded as a test consumable and needs to be checked and replaced after each test; The detection process is carried out in a dedicated explosion-proof test laboratory, the dangerous chemical product cabinet 7 to be tested and all detection modules in the cabinet should be placed in a sealed explosion-proof test cabin, the test cabin has a wall thickness of not less than 10 mm, is provided with a bursting disc type safety pressure relief port and an inert gas automatic fire extinguishing system, so that even if the cabinet to be tested completely fails, the overall safety of the laboratory can be ensured; The main controller 101 adopts an industrial computer, which is connected with each module through an optical fiber communication link to realize electrical isolation and avoid potential influence of explosion impact on the control core; The pressure sensor array 501, in the embodiment, three piezoelectric dynamic pressure sensors (for example, PCB Piezotronics 113B series) with a range of 2.5 MPa and a sampling rate of 200 kHz are selected, and are firmly installed on the pressure measuring holes pre-processed on the inner wall of the cabinet through flanges and threads, and a detachable anti-pollution metal cover is installed in front of the sensor; The igniter 401 is an electric spark type, and the ignition electrode may be ablated after a single high-intensity explosion, so the igniter 401 is designed as a modular structure which can be quickly plugged and unplugged, so as to facilitate replacement after the test; The circulating fan 203 is automatically cut off by the main controller 101 30 seconds before the ignition is triggered after the system completes the aerosol concentration equalization, so that the circulating fan 203 completely stops rotating, so as to maximize the protection of the fan from the damage of the explosion shock wave.

[0028] The specific working principle and use method of the application are as follows: S1, system self-checking and cabinet sealing verification, first, the detection system modules are self-checked to confirm that the components are working properly, then the differential pressure method is used to quantitatively evaluate the sealing performance of the hazardous chemical cabinet to be tested, the specific process is: clean air is filled into the closed cabinet to be tested to make the internal pressure rise to 1.5kPa, then the gas source is closed, the pressure decay curve is monitored by a high-precision pressure sensor, the leakage rate algorithm is: LeakRate=(ΔP*V) / (Δt*P_atm), wherein ΔP is the pressure drop value within Δt, V is the net volume of the cabinet, P_atm is the atmospheric pressure, when the calculated LeakRate is lower than 0.5mL / min, the sealing performance is determined to be qualified; S2, cabinet environment simulation, the temperature and humidity in the cabinet are adjusted and stabilized at the preset target value by the environment simulation module, according to the test requirements, different temperature and humidity conditions can be set to simulate the explosion-proof performance of the cabinet under different environments, for example, the standard environmental conditions of 25±2℃ and 50±5% relative humidity are set; S3, aerosol injection and concentration equalization, flammable aerosol (such as isopropyl alcohol) is injected into the cabinet by the aerosol generating device, and the closed loop feedback system composed of the aerosol generating device and the concentration sensor makes the aerosol concentration in the cabinet reach and stabilize at the preset concentration (such as 50% of the lower explosive limit), the proportional-integral-derivative (PID) control algorithm is used to realize closed loop control, the fuel pump speed or carrier gas flow of the aerosol generating device is dynamically adjusted to make the aerosol concentration reach the preset value, and the aerosol concentration in the cabinet is stabilized at the preset value; S4, ignition trigger and multi-modal data synchronous acquisition, after confirming the concentration equalization, at least one igniter is triggered remotely, and the pressure sensor array and high-speed camera are started synchronously to collect explosion pressure waveform and flame propagation image, the trigger command is sent by the detection control platform through an isolated optical fiber communication link to ensure synchronization accuracy and operation safety; S5, data processing and explosion-proof performance evaluation, the collected pressure data and image data are processed, the maximum explosion pressure, maximum pressure rise rate and flame propagation speed are calculated by algorithm, and the structural integrity of the cabinet is comprehensively evaluated to generate a detection report; The maximum explosion pressure is directly taken from the peak point of the pressure-time curve; The maximum pressure rise rate is obtained by smoothing the pressure-time curve, then calculating its first derivative, and finding the maximum value of the derivative in the explosion rising segment; The flame propagation speed is calculated by processing the image sequence collected by the high-speed camera. The specific algorithm is: color space conversion, binarization (using the Otsu method) and contour recognition are performed on each frame of image to determine the position of the flame front peak, the displacement of the flame front peak between consecutive frames is calculated, and then divided by the time interval between frames to obtain the flame propagation speed sequence, and the maximum value is taken as the evaluation index. Before calculation, the pixel distance needs to be converted into actual distance by calibrating the scale; Embodiment: The following further illustrates the embodiment of the present application through a specific embodiment; Test object: a commercial hazardous chemical storage cabinet with a volume of 200L; Environmental conditions: temperature 25℃, relative humidity 50%; Test medium: isopropyl alcohol aerosol (explosion lower limit 2.0%, test concentration set to 1.0%, i.e. 50% of the explosion lower limit); Ignition method: single-point ignition at the center, ignition energy 10J; Data acquisition: pressure sensor sampling rate 100kHz, high-speed camera acquisition frame rate 5000fps; Test process: first, system self-checking and cabinet sealing verification, fill clean air into the cabinet to 1.5kPa positive pressure, monitor the pressure decay within 5 minutes, calculate the leakage rate as 0.3mL / min, which is lower than the threshold value of 0.5mL / min, and determine that the sealing is qualified; Adjust and stabilize the cabinet environment temperature to 25℃, relative humidity to 50%; inject isopropyl alcohol aerosol, and stabilize the aerosol concentration in the cabinet at 1.0% through PID closed-loop control; remotely trigger the igniter, start the pressure sensor array and high-speed camera at the same time, and record the explosion process; process the collected data to calculate the maximum explosion pressure as 0.85MPa, the maximum pressure rise rate as 35MPa / s, and the maximum flame propagation speed as 2.8m / s; check the cabinet structure integrity, and no permanent deformation or damage is found; generate a test report, and comprehensively evaluate that the explosion-proof performance of the hazardous chemical cabinet is qualified.

[0029] It should be noted that, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. The contents not described in detail in this specification are the prior art known to those skilled in the art.

[0030] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form; any person skilled in the art can easily implement the present application according to the drawings and the above description; however, any person skilled in the art can make some changes, modifications and equivalent changes within the scope of the technical solutions of the present application, and the equivalent embodiments of the present application are still within the protection scope of the technical solutions of the present application.

Claims

1. An explosive performance detection system of a hazardous chemical cabinet based on aerosol test, comprising a detection control platform (1), an aerosol supply module (2), an environment simulation module (3), an ignition trigger module (4), a multi-modal data acquisition module (5), a sealing verification module (6), and a hazardous chemical cabinet to be tested (7), characterized in that: The detection control platform (1) comprises a main controller (101), a data acquisition unit (102), a man-machine interface (103) and a data storage and processing unit, which is the central control and data processing core of the system: ​ The aerosol supply module (2) is communicated with the internal cavity of the dangerous chemical product cabinet (7) through a pipeline, comprising an aerosol generator (201), a conveying pipeline (202), a circulating fan (203) and a concentration sensor (204); The environmental simulation module (3) comprises a temperature sensor (301), a humidity sensor (302), a heater (303) and a humidifier (304), and the temperature sensor (301) and the humidity sensor (302) are arranged in the internal cavity of the dangerous chemical product cabinet (7); The ignition trigger module (4) comprises an igniter (401) and a trigger circuit (402), which is arranged in the internal cavity of the dangerous chemical product cabinet (7): The multi-modal data acquisition module (5) comprises a pressure sensor array (501) and a high-speed camera (502), and both of them are used for data acquisition of the internal explosion area of the dangerous chemical product cabinet (7); The sealing verification module (6) is communicated with the internal cavity of the dangerous chemical product cabinet (7), comprising a high-precision pressure sensor (601) and a clean air supply device (602): The detection control platform (1) is signal connected with the aerosol supply module (2), the environmental simulation module (3), the ignition trigger module (4), the multi-modal data acquisition module (5) and the sealing verification module (6) through a cable or an optical fiber communication link, so as to coordinate and control the whole test process and collect data.

2. The system according to claim 1, wherein, The main controller (101) adopts a programmable logic controller (PLC) or an industrial computer, which is used for executing test logic and coordinating each module; the data acquisition unit (102) adopts a multi-channel high-speed analog and digital quantity acquisition card, which is used for receiving signals from each sensor; the man-machine interface (103) adopts a touch screen or a computer graphic interface, which is used for parameter setting, process monitoring and result display, and the data storage and processing unit is used for storing original data and calculating explosion-proof performance evaluation indexes through a built-in algorithm.

3. The detection system for explosion-proof performance of the hazardous chemical cabinet based on aerosol test according to claim 1, characterized in that, The aerosol generator (201) is used for atomizing liquid combustible agent into aerosol state, the conveying pipeline (202) is made of anti-static material, and is connected with the aerosol generator (201) and the dangerous chemical product cabinet (7); the circulating fan (203) is installed in the dangerous chemical product cabinet (7) to promote uniform distribution of the aerosol; the concentration sensor (204) monitors the aerosol concentration in the cabinet in real time and feeds back to the detection control platform (1); the concentration sensor (204) and the aerosol generator (201) constitute a closed-loop feedback system, which dynamically adjusts the aerosol concentration to a preset value through a PID control algorithm.

4. The detection system for explosion-proof performance of the hazardous chemical cabinet based on aerosol test according to claim 1, characterized in that, The detection control platform (1) controls the working state of the heater (303) and the humidifier (304) according to the readings of the temperature sensor (301) and the humidity sensor (302), so that the environment in the cabinet is stabilized at the preset temperature and humidity target value.

5. The detection system for explosion-proof performance of the hazardous chemical cabinet based on aerosol test according to claim 1, characterized in that, The igniter (401) is at least one, using electric spark type or high temperature wire type, arranged in the center or corner of the cabinet according to the test requirements, the trigger circuit (402) is connected with the igniter (401), receives the trigger instruction from the detection control platform (1), the trigger instruction is transmitted through the isolated optical fiber communication link, supports multiple point synchronous trigger or sequence trigger according to the preset time sequence.

6. The detection system for explosion-proof performance of the hazardous chemical cabinet based on aerosol test according to claim 1, characterized in that, The pressure sensor array (501) is composed of not less than three high-frequency dynamic pressure sensors, which are installed on the inner wall of the cabinet in a spatial distribution manner, the sampling rate of a single sensor is not less than 100 kHz, the dangerous chemical product cabinet (7) is provided with a cabinet door, and the cabinet door is provided with an explosion-proof window, the high-speed camera (502) observes the flame propagation process in the cabinet through the explosion-proof window, and the acquisition frame rate is not less than 1000 frames / s, the pressure sensor array (501) and the high-speed camera (502) are started at the same time by the synchronous signal sent by the detection control platform (1), and the explosion pressure waveform and the flame development image are recorded respectively.

7. The detection system for explosion-proof performance of the hazardous chemical cabinet based on aerosol test according to claim 1, characterized in that, The detection control platform (1) controls the clean air supply device (602) to charge the cabinet to a predetermined positive pressure of 1.0kPa to 2.5kPa, and then closes the air source, and calculates the leakage rate by monitoring the pressure decay curve of the high-precision pressure sensor (601).

8. The aerosol test-based hazardous chemical cabinet explosion-proof performance detection system according to claim 7, characterized in that, The high-precision pressure sensor (601) is arranged in the cabinet and is used for measuring the small pressure change in the cabinet, and the clean air supply device (602) is communicated with the cabinet and is used for charging clean air into the cabinet to establish an initial positive pressure.

9. A method for detecting the explosion-proof performance of a hazardous chemical cabinet based on aerosol testing, characterized in that, The method comprises the following steps: S1, system self-checking and cabinet sealing verification step: self-checking each module of the detection system, and quantitatively evaluating the sealing performance of the dangerous chemical product cabinet by using a differential pressure method, wherein the quantitative evaluation by using the differential pressure method specifically comprises: charging clean air into the cabinet to establish an initial positive pressure of 1.0kPa to 2.5kPa, closing the air source, monitoring the pressure decay curve, and calculating the leakage rate according to the formula LeakRate=(ΔP*V) / (Δt*P_atm), wherein ΔP is the pressure drop value in Δt time, V is the net volume of the cabinet body, and P_atm is the atmospheric pressure; the calculated leakage rate can be understood as an equivalent volume leakage flow rate under standard atmospheric pressure; when the leakage rate is lower than 0.5mL / min, it is determined that the sealing performance is qualified; S2, cabinet environment simulation step: adjusting and stabilizing the temperature and humidity in the cabinet to the preset target value through the environment simulation module; S3: aerosol injection and concentration equalization step: injecting flammable aerosol into the cabinet by the aerosol generating device, and making the aerosol concentration in the cabinet reach and stabilize at the preset concentration through the closed loop feedback system composed of the aerosol generating device and the concentration sensor; S4, ignition trigger and multi-modal data synchronous acquisition step: after confirming the concentration equalization, remotely triggering at least one igniter, and starting the pressure sensor array and the high-speed camera synchronously, explosion pressure waveform and flame propagation image are collected. S5, data processing and explosion-proof performance evaluation step: the collected pressure data and image data are processed, the maximum explosion pressure, the maximum pressure rise rate and the flame propagation speed are calculated through an algorithm, and the structural integrity of the cabinet is comprehensively evaluated to generate a detection report.

10. The method according to claim 9, wherein, In step S5, the data processing specifically includes: calculating the first derivative after smoothing filtering the pressure-time curve, finding the maximum value of the derivative in the explosion rising section as the maximum pressure rise rate; performing image processing on the high-speed image sequence, including binarization and contour recognition, determining the flame front position and calculating the displacement between consecutive frames, combining the frame rate and the calibration scale to obtain the flame propagation speed sequence, and taking the maximum value as the evaluation index.

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