Switch cabinet pyroelectric particle test system and test method

Abstract

The invention discloses a switch cabinet pyroelectric particle test system and test method, and relates to the technical field of power equipment monitoring and early warning. Comprising a current source, a test box body, an analysis module, a gas circulation system, a controller and a test device, a test wire, a temperature acquisition module and a multi-stage switchable filter are arranged in the test box body, the test wire is connected with the current source, and the temperature acquisition module detects the temperature of the test wire; the multi-stage switchable filter is provided with a plurality of independent filtering units with different pore diameters; the analysis module is connected with the multi-stage switchable filter, a fitting particle concentration and particle size distribution curve is built in the controller, the multi-stage switchable filter is controlled in real time, and when the fitting error of the particle size distribution curve reaches a set value, gas is output for testing; by dynamically adjusting the multi-stage switchable filter, curve fitting of particle concentration and particle size distribution is ensured, the real material pyrolysis process of the switch cabinet is simulated, and the test method is high in repeatability, consistency and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment monitoring and early warning, and particularly relates to a hot release particle test system and a test method for a switch cabinet. Background Art

[0002] A high-voltage switch cabinet mainly consists of components such as a circuit breaker, an earthing switch, a lightning arrester, a current transformer, a voltage transformer, and a live display device, and plays important roles such as switching on and off, controlling, and protecting in the power system. In recent years, with the continuous expansion of the power grid scale and the gradual increase of the voltage level, ensuring the safe and stable operation of the high-voltage switch cabinet is of great significance for improving the reliability of the entire power system.

[0003] When an electrical fault occurs in the switch cabinet, the main heat-generating bodies are the joints of the cable and the protective electrical switch, the polyvinyl chloride (PVC) insulating outer skin of the cable, and the insulating sheath (ABS material) of the protective electrical appliance. Heat generates particles, and the diameters of these particles are usually in the nanometer to micrometer level, which is one of the important characteristics in the early stage of an electrical fire. By using the hot release particle detector technology, early warning of electrical faults at an extremely early stage can be achieved, preventing fires before they occur.

[0004] By simulating the generation and propagation process of hot release particles in the switch cabinet and testing the hot release particles, potential faults can be detected in advance to ensure the safe operation of the switch cabinet. Traditional hot release particle tests mainly have the following defects: 1. Material limitation: When traditional hot release particle detection equipment is tested, PVC or ABS materials are generally used for isothermal pyrolysis tests. Affected by the consistency of material preparation, the repeatability of hot release particles in the early stage is poor, it is difficult to accurately match the pyrolysis particles of typical materials in the switch cabinet overheating, and the pyrolysis gas components are complex, there is a risk of pollution; 2. Insufficient sensitivity: The response threshold of existing hot release particle detectors to the particle release in the smoldering stage (temperature < 200 °C) is too high, and early warning cannot be triggered in the initial stage of a fire; 3. Unable to capture transient temperature rise in real time: Traditional methods rely on fixed-point thermocouples or infrared spot checks and cannot capture transient temperature rise in real time (such as the microsecond-level temperature sudden rise caused by arc discharge). Summary of the Invention

[0005] The present invention aims to solve the technical problems of poor repeatability, consistency, insufficient sensitivity, and poor reliability when traditional hot release particle detection equipment is tested, and aims to provide a hot release particle test system and a test method for a switch cabinet, which can simulate the real material pyrolysis process of the switch cabinet, ensure the curve fitting of the particle concentration and particle size distribution by dynamically adjusting a multi-stage switchable filter, and establish a standardized test method. The test method has high repeatability and consistency, which is beneficial to improving the sensitivity and reliability of fire early warning.

[0006] The present invention is achieved by the following technical solutions:

[0007] The first object of the present invention is to provide a thermal release particle testing system for switchgear, including a current source, a testing box body, an analysis module, a gas circulation system, a controller, and a testing device;

[0008] A test wire, a temperature acquisition module, and a multi-stage switchable filter are arranged in the test box body. The test wire is connected to the current source, the temperature acquisition module is installed on the test wire, and the multi-stage switchable filter is arranged at the gas outlet of the test box body and has multiple independent filter units with different pore sizes;

[0009] The analysis module is connected to the multi-stage switchable filter for obtaining particle size and concentration data of the filtered gas;

[0010] The controller is electrically connected to the current source, the temperature acquisition module, the multi-stage switchable filter, and the analysis module;

[0011] The controller internally fits the particle concentration and particle size distribution curve, and adjusts and matches the filter units with different pore sizes in real time to circulate and filter the gas through the gas circulation system. When the fitting error of the particle size distribution curve reaches the set value, the gas is output and tested through the testing device.

[0012] Further, the analysis module includes a laser particle size analyzer and a light scattering type concentration tester, and the inlet of the analysis module is connected through the multi-stage switchable filter of the gas output pipeline.

[0013] Further, the maximum fitting error of the particle size distribution curve does not exceed 10%;

[0014] Further, the multi-stage switchable filter includes filter units with pore sizes of Φ1, Φ2, Φ3, Φ4, Φ5, Φ6, and Φ7, and the values of Φ1, Φ2, Φ3, Φ4, Φ5, Φ6, and Φ7 increase in sequence and range between 0.1 - 10 μm.

[0015] Further, the gas circulation system includes a circulation pipeline and a circulation solenoid valve. The inlet of the circulation pipeline is connected to the outlet of the analysis module, and the outlet of the circulation pipeline is connected to the gas inlet of the test box body.

[0016] Further, the testing device uses an aspirating smoke fire detector, and the inlet of the aspirating smoke fire detector is connected to the outlet of the analysis module through a test pipeline.

[0017] Further, the temperature acquisition module uses a fluorescent optical fiber temperature sensor, and the current source uses a digital programmable current source. The digital programmable current source dynamically adjusts the current through the PID algorithm to simulate different overheating scenarios.

[0018] Further, a fan is also provided inside the test chamber.

[0019] Further, an air inlet and an air outlet are also formed on the test chamber. A fresh air filter is arranged inside the air inlet, and a vacuum pumping device is connected to the air outlet.

[0020] The second object of the present invention is to provide a method for testing heat-released particles of a switch cabinet, which is carried out based on the aforementioned test system and includes the following steps:

[0021] S1. The current source outputs current to overheat the test wire.

[0022] S2. The temperature acquisition module collects the temperature data of the test wire in real time to the controller, and the controller adjusts the current to simulate different overheating scenarios.

[0023] S3. The analysis module collects the particle size distribution and particle concentration in real time.

[0024] S4. The controller internally fits the curve of the particle concentration and the particle size distribution, and adjusts and matches the filtering units with different apertures to circularly filter the gas in real time. When the fitting error of the particle size distribution curve reaches the set value, the gas is output to the test device for testing.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] 1. The test system of the present invention can simulate the pyrolysis process of the real materials of the switch cabinet. By switching the filtering units with different apertures and controlling the usage time of the filtering units with different apertures, the dynamic adjustment of the particle size and concentration in the filtered gas can be realized, the monitoring of the particle size and concentration can be achieved, the curve fitting of the particle concentration and the particle size distribution can be ensured, which is beneficial to improving the repeatability and consistency of the test, facilitating the further monitoring and analysis of electrical faults, and thus providing a more reliable basis for the early warning of electrical faults at the extremely early stage.

[0027] 2. The present invention establishes a standardized test method for simulating the pyrolysis process of the real materials of the switch cabinet. By accurately and dynamically adjusting the particle size and concentration, the curve fitting of the particle concentration and the particle size distribution can be ensured, which is beneficial to improving the sensitivity and reliability of fire warning.

[0028] 3. The present invention adopts a digital program-controlled current source to dynamically adjust the current through the PID algorithm, which can accurately reproduce the overheating scenario of the switch cabinet. By using a fluorescent optical fiber temperature sensor to detect the temperature of the test wire, the response speed is fast, the real-time monitoring of the temperature rise can be realized, and thus the transient temperature rise can be captured in real time. Description of the Drawings

[0029] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0030] Figure 1 Schematic diagram of the test system of the present invention;

[0031] Marks in the drawings and corresponding names of components:

[0032] 1 - test box body, 101 - air inlet, 102 - air outlet, 2 - fresh air filter, 3 - test wire, 4 - temperature acquisition module, 5 - fan, 6 - multi - stage switchable filter, 7 - analysis module, 8 - gas output pipeline, 9 - circulation pipeline, 10 - circulation solenoid valve, 11 - test pipeline, 12 - test solenoid valve, 13 - aspirating smoke detector, 14 - vacuum pumping device. Specific embodiments

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the embodiments and the drawings. Obviously, the illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not serve as a limitation of the present invention.

[0034] The following will appropriately refer to the drawings to detail the embodiments of a switch cabinet heat - release particle test system and test method of the present invention. However, there may be cases where unnecessary details are omitted. For example, there are cases of omitting detailed descriptions of well - known matters and repeated descriptions. This is to avoid the following description becoming unnecessarily long and to facilitate the understanding of those skilled in the art.

[0035] If there is no special instruction, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0036] If there is no special instruction, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0037] Unless otherwise specified, all steps of this application can be carried out sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) carried out sequentially, or may also include steps (b) and (a) carried out sequentially. For example, when it is mentioned that the method may further include step (c), it means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may also include steps (a), (c) and (b), or may also include steps (c), (a) and (b), etc.

[0038] The technical solution of the present invention will be further described in detail below in conjunction with embodiments.

[0039] It should be noted that the experimental methods used in the embodiments are all conventional methods unless otherwise specified. The materials, methods and instruments used are all conventional materials, methods and instruments in the art, and those skilled in the art can obtain them through commercial channels without special instructions.

[0040] Embodiment 1

[0041] This embodiment provides a hot release particle test system for a switchgear cabinet, as Figure 1 shown, including a current source, a test box 1, an analysis module 7, a gas circulation system, a controller, and a test device;

[0042] A test wire 3, a temperature acquisition module 4, and a multi-stage switchable filter 6 are arranged in the test box 1. The test wire 3 is connected to the current source. The temperature acquisition module 4 is installed on the test wire 3. The multi-stage switchable filter 6 is arranged at the gas outlet of the test box 1 and has multiple independent filter units with different pore sizes;

[0043] The analysis module 7 is connected to the multi-stage switchable filter 6 for obtaining particle size and concentration data of the filtered gas;

[0044] The controller is electrically connected to the current source, the temperature acquisition module 4, the multi-stage switchable filter 6, and the analysis module 7;

[0045] The controller internally fits the particle concentration and particle size distribution curve, and adjusts and matches the filter units with different pore sizes in real time. The filtered gas is sent back to the test box 1 through the gas circulation system for circulation. When the fitting error of the particle size distribution curve reaches the set value, the gas is output and tested through the test device.

[0046] Among them, the maximum fitting error of the particle size distribution curve does not exceed 10%. The specific fitting error can be set as needed, such as 8%, 6%, 5%, 3%, preferably not exceeding 5%.

[0047] It should be noted that the simulation is carried out according to the set pyrolysis particle concentration curves of different materials, and the successive approximation algorithm model is used for filtering and fitting.

[0048] The test system provided by the present invention is used to simulate the real material pyrolysis process of the switch cabinet. The test wire 3 is heated by a current source, and the temperature acquisition module 4 feeds back the wire temperature to the controller in real time. The controller dynamically adjusts the current to maintain the target temperature rise rate, so as to realize the simulation of different overheating scenarios. The particles generated by the pyrolysis of the test wire 3 enter the analysis module 7 through a pipeline. The analysis module 7 generates a real-time particle size distribution curve and records the change of concentration over time. The controller internally fits the particle concentration and the particle size distribution curve; when the fitting error of the particle size distribution curve exceeds 5%, the controller switches the filtering units with different pore sizes in the filter according to the analysis data and circulates and filters the gas. In this way, by switching the filtering units with different pore sizes and controlling the usage time of the filtering units with different pore sizes, the dynamic adjustment of the particle size and concentration in the filtered gas is realized, the monitoring of the particle size and concentration is realized, and the curve fitting of the particle concentration and the particle size distribution is ensured; when the fitting error of the particle size distribution curve reaches the set value, the filtered gas can be output to the test device for testing.

[0049] The test system of the present invention can simulate the real material pyrolysis process of the switch cabinet, dynamically adjust the particle size and concentration of the particles, ensure the curve fitting of the particle concentration and the particle size distribution, which is beneficial to improving the repeatability and consistency of the test, facilitating the further monitoring and analysis of electrical faults, and thus providing a more reliable basis for the early warning of electrical faults at the extremely early stage.

[0050] It should be noted that in the present invention, the test wire 3 is the same as the switch cabinet busbar (such as silver-plated copper core), which can reduce the difference between the test wire 3 and the actual materials of the switch cabinet and improve the reliability of the simulation test.

[0051] Among them, the analysis module 7 includes a laser particle size analyzer and a light scattering type concentration tester. The inlet of the analysis module 7 is connected through a multi-stage switchable filter 6 of a gas output pipeline 8. The measurement range of the laser particle size analyzer is 0.01 - 10 μm, and the resolution is ±0.01 μm. The detection lower limit of the light scattering type concentration tester is 10 particles / cm3). The laser particle size analyzer and the light scattering type concentration tester respectively collect the particle size and concentration data in the gas, and combine the fitting results internally set by the controller to control the automatic switching of the multi-stage switchable filter 6, so as to realize the adjustment of the particle size distribution.

[0052] Among them, the multi-stage switchable filter 6 includes filter units with pore sizes of Φ1, Φ2, Φ3, Φ4, Φ5, Φ6, and Φ7, and the values of Φ1, Φ2, Φ3, Φ4, Φ5, Φ6, and Φ7 increase in sequence and range from 0.1 to 10 μm.

[0053] Preferably, the value range of Φ1 is 0.1 - 0.2 μm, the value range of Φ2 is 0.2 - 0.3 μm, the value range of Φ3 is 0.4 - 0.5 μm, the value range of Φ4 is 1.0 - 1.2 μm, the value range of Φ5 is 2 - 3 μm, the value range of Φ6 is 4 - 6 μm, and the value range of Φ7 is 8 - 10 μm.

[0054] More preferably, the multi-stage switchable filter 6 adopts filter units with pore sizes of 0.1 μm, 0.2 μm, 0.5 μm, 1.0 μm, 2.5 μm, 5 μm, and 10 μm.

[0055] It should be noted that the multi-stage switchable filter 6 is driven by a stepper motor and automatically matches the filter unit with the target pore size according to the particle size analysis result. Specifically, the filter units with different pore sizes in the multi-stage switchable filter 6 are all independent filters. The filter units with different pore sizes are installed on a turntable. The stepper motor drives the turntable to rotate through a gear or a lead screw, and the stepper angle of the stepper motor is controlled by a controller to realize the switching of filter units with different pore sizes.

[0056] Among them, the gas circulation system includes a circulation pipeline 9 and a circulation solenoid valve 10. The inlet of the circulation pipeline 9 is connected to the outlet of the analysis module 7, and the outlet of the circulation pipeline 9 is connected to the gas inlet of the test chamber 1. The gas circulation system is set up to circulate and filter the gas. When the particle size in the gas does not meet the set value, the filter unit needs to be adjusted to further filter the gas until the set requirements are met to ensure the curve fitting of the particle concentration and particle size distribution. As Figure 1 shown, a circulation solenoid valve 10 is provided on the circulation pipeline 9 to control the flow of the circulating gas. When the particle size in the gas does not meet the set value, the controller controls to open the circulation solenoid valve 10 to realize the circulating filtration of the gas.

[0057] Among them, the test device adopts an aspirating smoke fire detector 13, and the inlet of the aspirating smoke fire detector 13 is connected to the outlet of the analysis module 7 through a test pipeline 11. As Figure 1 shown, a test solenoid valve 12 is provided on the test pipeline 11. When the particle size in the gas meets the set value, the controller controls to open the test solenoid valve 12 to output the gas, and the aspirating smoke fire detector 13 is used to test the gas, which has high sensitivity.

[0058] Among them, the temperature acquisition module 4 uses a fluorescence optical fiber temperature sensor, which is installed on the test wire 3. The fluorescence optical fiber temperature sensor has a fast temperature response speed and can realize real-time monitoring of temperature rise, so as to capture transient temperature rise in real time. The current source uses a digital programmable current source, with an output current range of 0 - 200A and an accuracy of ±0.1A. The digital programmable current source dynamically adjusts the current through the PID algorithm to simulate different overheating scenarios.

[0059] Embodiment 2

[0060] This embodiment further describes the test system of the present invention on the basis of Embodiment 1.

[0061] As Figure 1 shown, a fan 5 is further provided in the test box 1. By arranging the fan 5 in the test box 1 and using the fan 5 to stir the gas in the test box 1, the gas flow and circulation can be strengthened, and at the same time, the particle distribution in the gas can be made uniform, providing guarantee for subsequent analysis and testing.

[0062] Embodiment 3

[0063] This embodiment further describes the test system of the present invention on the basis of Embodiment 1.

[0064] As Figure 1 shown, an air inlet 101 and an air outlet 102 are further provided on the test box 1. A fresh air filter 2 is arranged in the air inlet 101, and a vacuum pumping device 14 is connected to the air outlet 102. By arranging the fresh air filter 2 at the air inlet 101 of the test box 1, the incoming air can be filtered. After the test is completed, the test box 1 is emptied through the vacuum pumping device 14, and then purged with nitrogen to clean the test environment and avoid interference with the next experiment.

[0065] Embodiment 4

[0066] This embodiment provides a method for testing heat-released particles of a switchgear, which is carried out based on the foregoing test system and includes the following steps:

[0067] S1. Select the wire diameter of the test wire 3 and connect the test wire 3 to control the digital programmable current source;

[0068] S2. The controller controls the digital programmable current source to output current to overheat the test wire 3;

[0069] S3. The temperature acquisition module 4 collects the temperature data of the test wire 3 in real time to the controller, and the controller dynamically adjusts the current to simulate different overheating scenarios;

[0070] S4. The analysis module 7 collects the particle size distribution and particle concentration in real time;

[0071] S5. The controller internally fits the curve of particle concentration and particle size distribution, combines the current particle size distribution, adjusts and matches filtration units with different pore sizes to circularly filter the gas. When the fitting error of the particle size distribution curve reaches the set value, the gas is output to the test device for testing.

[0072] S6. After the test is completed, evacuate the test chamber 1 through the vacuum device 14 and purge it with nitrogen to avoid interference with the next experiment.

[0073] The present invention aims at simulating the pyrolysis process of the real materials of switch cabinets, establishes a standardized test method, can dynamically adjust the particle size and concentration of particles, ensures the curve fitting of particle concentration and particle size distribution, and improves the repeatability and consistency of the test.

[0074] Example 5

[0075] This example is based on Example 4 and is for illustration.

[0076] This example uses a copper wire with a wire diameter of 0.1 mm 2 for testing, with a normal working current of 0.5 A, stepping with a step size of 0.05 A increasing, and the time for each step being adjustable from 2 to 5 minutes.

[0077] It is designed that the particle size ratios corresponding to 0.1, 0.2, 0.5, 1.0, 2.5, 5, and 10 μm are 5%, 14%, 20%, 26%, 18%, 12%, and 5% respectively; according to the real-time concentration of the particle concentration distribution ratio of the particle size analysis instrument, it is found that the particle concentration ratios of 5 and 10 μm particles are 20% and 12%; the ratios exceed the original set curve, the ratio of 10 μm particles exceeds 7%, and the ratio of 5 μm particles exceeds 8%. By adjusting the filtration units for 5 and 10 μm, first filter particles with a particle size greater than 10 μm, and then filter particles with a particle size greater than 5 μm. By filtration, reduce the ratio of corresponding particle size particles, and combine with the real-time monitored corresponding particle concentration ratio after filtration. When the error is less than 3%, stop filtration, meet the requirements, and then the gas can be output for testing.

[0078] Finally, it should be noted that: the above specific examples are only used to illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only the specific implementation manners of the present invention and is not used to limit the protection scope of the present invention; although the present invention has been described in detail with reference to the above specific examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above examples, or perform equivalent replacements or improvements on some or all of the technical features; and these modifications, equivalent replacements and improvements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A switch cabinet pyrolysis particle testing system, characterized in that: It comprises a current source, a test box (1), an analysis module (7), a gas circulation system, a controller, and a test device; The test box (1) is provided with a test wire (3), a temperature acquisition module (4), and a multi-stage switchable filter (6); the test wire (3) is connected to a current source; the temperature acquisition module (4) is installed on the test wire (3); the multi-stage switchable filter (6) is arranged at the gas outlet of the test box (1) and has a plurality of independent filter units with different pore sizes; The analysis module (7) is connected to the multi-stage switchable filter (6) and is used to obtain particle size and concentration data in the filtered gas; The controller is electrically connected to the current source, the temperature acquisition module (4), the multi-stage switchable filter (6) and the analysis module (7); The controller has a built-in fitting particle concentration and particle size distribution curve, and adjusts in real time the filter units matching different apertures to circulate and filter the gas through the gas circulation system. When the particle size distribution curve fitting error reaches a set value, the gas is output and tested by a testing device.

2. A switch cabinet pyrolytic particle testing system according to claim 1, characterized in that: The analysis module (7) comprises a laser particle size analyzer and a light scattering concentration tester, and the inlet of the analysis module (7) is connected via a multi-stage switchable filter (6) of a gas output pipeline (8).

3. A switch cabinet pyrolytic particle testing system according to claim 1, characterized in that: The maximum fitting error of the particle size distribution curve does not exceed 10%.

4. A switch cabinet pyrolytic particle testing system according to claim 1, characterized in that: The multi-stage switchable filter (6) comprises filter units with pore sizes of Φ1, Φ2, Φ3, Φ4, Φ5, Φ6 and Φ7, wherein the values ​​of Φ1, Φ2, Φ3, Φ4, Φ5, Φ6 and Φ7 increase in sequence and are in the range of 0.1-10 μm.

5. The switch cabinet pyrolytic particle testing system according to claim 1, characterized in that: The gas circulation system comprises a circulation pipeline (9) and a circulation solenoid valve (10); the inlet of the circulation pipeline (9) is connected to the outlet of the analysis module (7); and the outlet of the circulation pipeline (9) is connected to the gas inlet of the test box (1).

6. The switch cabinet pyrolytic particle testing system according to claim 1, characterized in that: The test device adopts an aspirating smoke fire detector (13), and the inlet of the aspirating smoke fire detector (13) is connected to the outlet of the analysis module (7) through a test pipeline (11).

7. A switch cabinet pyrolytic particle testing system according to any one of claims 1 to 5, characterized in that: The temperature acquisition module (4) adopts a fluorescent optical fiber temperature sensor, and the current source adopts a digital programmable current source. The digital programmable current source dynamically adjusts the current through a PID algorithm to simulate different overheating scenarios.

8. The switch cabinet pyrolytic particle testing system according to claim 6, characterized in that: A fan (5) is also provided in the test box (1).

9. A switch cabinet pyrolytic particle testing system according to claim 6, characterized in that: The test box (1) is also provided with an air inlet (101) and an air outlet (102); a fresh air filter (2) is arranged in the air inlet (101), and a vacuum device (14) is connected to the air outlet (102).

10. A switch cabinet pyrolytic particle testing method, characterized in that: The test system according to any one of claims 1 to 8 is carried out, comprising the following steps: S1, the current source outputs a current that causes the test lead (3) to overheat; S2, the temperature acquisition module (4) collects the temperature data of the test wire (3) in real time and transmits it to the controller, and adjusts the current through the controller to simulate different overheating scenarios; S3, analysis module (7) collects particle size distribution and particle concentration in real time; S4. The controller has a built-in fitting of the particle concentration and particle size distribution curve, and adjusts the filter units with different pore sizes in real time to circulate and filter the gas. When the particle size distribution curve fitting error reaches the set value, the gas is output to the test device for testing.

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