Experimental device for evaluating influence of environment humidity on dust cloud explosion characteristics

Abstract

The utility model discloses an experimental device for evaluating the influence of environmental humidity on dust cloud explosion characteristics, which comprises an explosion bin, a dust bin, a dust injection system, a dehumidification and humidification system and a data acquisition system, the explosion bin is used for providing a dust cloud explosion environment and collecting explosion data, the dust bin is used for placing dust to be detected, and the dust injection system is used for injecting dust into the explosion bin. The dust injection system is used for injecting to-be-detected dust in the dust bin into the explosion bin to form uniform and stable dust cloud, and the dehumidification and humidification system is used for dehumidifying or humidifying air in the explosion bin according to the required humidity condition; and the data acquisition system is used for collecting related data of dust cloud explosion and transmitting the data to a computer for storage, so that subsequent data analysis is facilitated. Therefore, the dust explosion testing device can realize that different types of dust form dust cloud in environments with different humidity to perform dust explosion testing, is used for exploring explosion states of the dust in the environments with different humidity, and provides data support for dust explosion prevention and industrial safety production.

Description

Technical Field

[0001] The utility model belongs to the research field of dust explosion discipline, in particular to an experimental device for evaluating the influence of environmental humidity on the explosion characteristics of dust clouds. Background Art

[0002] Combustible dust is inevitably used or generated during industrial production processes across various sectors. Given the diverse ways dust is generated and the high volume of production, serious dust explosions are common. When combustible dust mixes with air under certain conditions, it forms a dust cloud that can quickly explode upon contact with an ignition source. The high temperatures and pressures generated by dust explosions can quickly damage equipment and buildings, severely impacting personal and property safety.

[0003] At present, domestic and international research on dust explosions mainly focuses on dust characteristic parameters and combustion and explosion characteristics. There is no systematic study on the impact of ambient humidity on dust cloud explosions. Ambient humidity is one of the important factors affecting dust diffusion. Climate, equipment temperature, etc. will cause changes in the humidity of the environment in which the dust is located. On the one hand, when the humidity increases, the moisture in the air will interact with some combustible dust (such as coal powder), and the condensation heat and wetting heat generated will cause the dust to spontaneously combust. In high-temperature environments, the moisture in the air will undergo a replacement reaction with metal dust, generating hydrogen, which will increase the risk of dust explosion. On the other hand, when the humidity decreases, the degree of adhesion of dust particles decreases, making them more likely to float in the air, which will also increase the probability of dust explosion.

[0004] Therefore, in-depth experimental research on the impact of ambient humidity on dust explosions is crucial for curbing dust explosions. Therefore, the technical problem addressed by this utility model is how to provide an experimental device for evaluating the impact of ambient humidity on the explosion characteristics of dust clouds, thereby exploring the explosion state of dust in different humidity environments and providing data support for dust explosion prevention and industrial safety production. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned existing technologies, the utility model provides an experimental device for evaluating the influence of environmental humidity on the explosion characteristics of dust clouds. It can simulate environments with different humidity to conduct dust explosion experiments, and is used to explore the explosion state of dust in different humidity environments, providing data support for dust explosion prevention and industrial safety production.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an experimental device for evaluating the influence of environmental humidity on the explosion characteristics of dust clouds, comprising an explosion chamber, a dust chamber, a dust injection system, a dehumidification and humidification system, and a data acquisition system;

[0007] The explosion chamber is used to provide a dust cloud explosion environment. The dust chamber is connected to the explosion chamber and is used to hold the dust to be tested. An opening and closing mechanism is provided between the dust chamber and the explosion chamber. When the opening and closing mechanism is opened, the dust chamber and the explosion chamber are connected; when the opening and closing mechanism is closed, the dust chamber and the explosion chamber are disconnected. An ignition head is provided in the explosion chamber for igniting the dust cloud.

[0008] The dust injection system includes a high-pressure air cylinder, a gas tank and a mushroom nozzle. A groove is provided in the dust bin, and the mushroom nozzle is installed in the groove. The high-pressure air cylinder is connected to the gas tank and the mushroom nozzle in sequence through a pipeline. The high-pressure air cylinder first buffers and reduces the pressure of the high-pressure gas in the gas tank and then transports it to the mushroom nozzle for spraying, so that the dust to be tested is blown up to form a dust cloud; a pressure reducing valve and a first pressure gauge are installed on the pipeline between the high-pressure air cylinder and the gas tank, the pressure reducing valve is used to reduce the pressure of the gas flowing through the pipeline, and the first pressure gauge is used to monitor the air pressure in the pipeline; an air valve and a second pressure gauge are installed on the pipeline between the gas tank and the mushroom nozzle, the air valve is used to control the on-off of the pipeline, and the second pressure gauge is used to monitor the air pressure in the pipeline;

[0009] The dehumidification and humidification system includes an air inlet pipe, a condenser, an evaporator, a compressor, a fan, a water tank and a vaporization mixer. One end of the air inlet pipe is connected to the vaporization mixer and the other end is connected to the explosion chamber. The condenser, evaporator and fan are all installed in the air inlet pipe, and the condenser is closer to the explosion chamber, the fan is closer to the vaporization mixer, and the evaporator is between the condenser and the fan; the fan is used to pump the gas in the explosion chamber to the vaporization mixer, the condenser and the evaporator are both connected to the compressor, and the condenser is used to condense the moisture in the gas and then pass it through the drainage trough The gas is transported to the water tank; the evaporator is used to evaporate the water in the gas; the water tank is connected to the gasification mixer through a water suction pipe, which is used to transport water to the gasification mixer. The gasification mixer is connected to the explosion chamber through an air pump and a return pipe, which is used to adjust the gas humidity and then return the adjusted gas to the explosion chamber through the air pump; a first valve is installed on the air intake pipe between the fan and the gasification mixer, and a second valve and a water pump are installed on the water suction pipe. The water pump is used to provide power for transporting the water in the water tank to the gasification mixer; a third valve is installed at the connection between the air intake pipe and the explosion chamber;

[0010] The data acquisition system includes a computer, a data acquisition instrument, an air pressure detection device, a temperature detection device, a humidity detection device and a first humidity detector. The first humidity detector is installed in the gasification mixer and is used to detect the gas humidity in the gasification mixer; the air pressure detection device, the temperature detection device and the humidity detection device are all installed in the explosion chamber and are used to detect the air pressure, gas temperature and humidity in the explosion chamber respectively; the data acquisition instrument is connected to the computer, the air pressure detection device, the temperature detection device, the humidity detection device, the first humidity detector and the second pressure gauge, and is used to obtain the data detected by the air pressure detection device, the humidity detection device, the first humidity detector and the second pressure gauge respectively, and feed it back to the computer for storage.

[0011] Furthermore, the explosion chamber includes four side panels and a top panel forming a rectangular body, wherein two opposite side panels are made of acrylic panels, and the remaining two side panels and the top panel are made of metal panels.

[0012] Furthermore, the opening and closing mechanism includes two movable plates and a baffle, and the two movable plates are respectively installed at the connection between the explosion bin and the dust bin through hinges. When the two movable plates are closed, the explosion bin and the dust bin can be connected. When the two movable plates are rotated to open with the hinges as the axis, the baffle passes through the connection between the explosion bin and the dust bin through the two movable plates, and is used to disconnect the explosion bin and the dust bin.

[0013] Furthermore, the reflux pipe includes four reflux branches, one end of each reflux branch is connected to the air pump, and the other end extends into the explosion chamber from different positions. Each reflux branch is provided with a valve, and the other end of each reflux branch is equipped with a nozzle.

[0014] Furthermore, it also includes a high-speed camera, which is used to shoot the explosion situation in the explosion chamber and feed it back to the data acquisition device.

[0015] Furthermore, the air pressure detection device includes multiple pressure sensors, which are distributed at different positions in the explosion chamber; the humidity detection device includes multiple humidity detectors, which are distributed at different positions in the explosion chamber; the temperature detection device includes multiple thermocouples, which are distributed at different positions in the explosion chamber.

[0016] Compared with the existing technology, the present invention combines an explosion chamber, a dust chamber, a dust injection system, a dehumidification and humidification system, and a data acquisition system. The explosion chamber is used to provide a dust cloud explosion environment and collect explosion data. The dust chamber is used to place the dust to be tested. The dust injection system is used to spray the dust to be tested in the dust chamber into the explosion chamber to form a uniform and stable dust cloud. The dehumidification and humidification system is used to dehumidify or humidify the air in the explosion chamber according to the required humidity. The data acquisition system is used to collect data related to the dust cloud explosion and transmit it to a computer for storage to facilitate subsequent data analysis. Therefore, the present invention can form dust clouds of different types of dust in environments with different humidity to conduct dust explosion tests, which is used to explore the explosion state of dust in different humidity environments and provide data support for dust explosion prevention and industrial safety production. In addition, the present invention is simple to operate and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 yes Figure 1 A perspective view of the interior of the explosion chamber.

[0019] In the figure: 1-high pressure air bottle, 2-pressure reducing valve, 3-first pressure gauge, 4-gas tank, 5-air valve, 6-second pressure gauge, 7-compressor, 8-water tank, 9-drain tank, 10-condenser, 11-evaporator, 12-fan, 13-intake pipe, 14-first valve, 15-water suction pipe, 16-second valve, 17-water pump, 18-first humidity detector, 19-gasification mixer, 20-air pump, 21a-fourth valve, 21b-fifth valve, 21c-sixth valve, 21d-seventh valve, 22-third valve, 23a-first nozzle, 23b-second nozzle, 23c-third nozzle, 23d-fourth nozzle, 24-baffle, 25-mushroom nozzle, 2 6a-first thermocouple, 26b-second thermocouple, 26c-third thermocouple, 27a-first pressure sensor, 27b-second pressure sensor, 27c-third pressure sensor, 28a-second humidity detector, 28b-third humidity detector, 28c-fourth humidity detector, 29a-first movable plate, 29b-second movable plate, 30a-first cylindrical pull rod, 30b-second cylindrical pull rod, 31-high-speed camera, 32-computer, 33-data acquisition device, 34-dust bin, 35-ignition head, 36-explosion bin, 37a-left steel plate, 37b-right steel plate, 38a-front acrylic plate, 38b-rear acrylic plate, 39-metal base. DETAILED DESCRIPTION

[0020] The utility model will be further described below.

[0021] like Figure 1 As shown, the utility model includes an explosion chamber 36, a dust chamber 34, a dust injection system, a dehumidification and humidification system and a data acquisition system;

[0022] The explosion chamber 36 is used to provide a dust cloud explosion environment. The dust chamber 34 is connected to the explosion chamber 36 and is used to hold the dust to be tested. An opening and closing mechanism is provided between the dust chamber 34 and the explosion chamber 36. When the opening and closing mechanism is opened, the dust chamber 34 and the explosion chamber 36 are connected; when the opening and closing mechanism is closed, the dust chamber 34 and the explosion chamber 36 are disconnected. An ignition head 35 is provided in the explosion chamber 36 for igniting the dust cloud. Figure 2 As shown, the explosion chamber 36 comprises four side panels and a top panel, forming a rectangular body. The two opposing side panels, front and rear acrylic panels 38a and 38b, are made of acrylic. The remaining two side panels are left and right steel panels 37a and 37b, respectively. The top panel is a metal plate. The dust bin 34 is located below the explosion chamber 36 and has a metal base 39 at its bottom.

[0023] The dust injection system includes a high-pressure air cylinder 1, a gas tank 4 and a mushroom nozzle 25. A groove is provided in the dust bin 34, and the mushroom nozzle 25 is installed in the groove. The high-pressure air cylinder 1 is connected to the gas tank 4 and the mushroom nozzle 25 in sequence through a pipeline. The high-pressure air cylinder 1 first buffers and reduces the pressure of the high-pressure gas through the gas tank 4, and then transports it to the mushroom nozzle 25 for spraying, so that the dust to be tested is blown up to form a dust cloud; a pressure reducing valve 2 and a first pressure gauge 3 are installed on the pipeline between the high-pressure air cylinder 1 and the gas tank 4. The pressure reducing valve 2 is used to reduce the pressure of the gas flowing through the pipeline, and the first pressure gauge 3 is used to monitor the air pressure in the pipeline; an air valve 5 and a second pressure gauge 6 are installed on the pipeline between the gas tank 4 and the mushroom nozzle 25. The air valve 5 is used to control the on-off of the pipeline, and the second pressure gauge 6 is used to monitor the air pressure in the pipeline;

[0024] The dehumidification and humidification system includes an air intake pipe 13, a condenser 10, an evaporator 11, a compressor 7, a fan 12, a water tank 8 and a gasification mixer 19. One end of the air intake pipe 13 is connected to the gasification mixer 19 and the other end is connected to the explosion chamber 36. The condenser 10, the evaporator 11 and the fan 12 are all installed in the air intake pipe 13, and the condenser 10 is closer to the explosion chamber 36, the fan 12 is closer to the gasification mixer 19, and the evaporator 11 is between the condenser 10 and the fan 12; the fan 12 is used to pump the gas in the explosion chamber 36 to the gasification mixer 19, the condenser 10 and the evaporator 11 are both connected to the compressor 7, the condenser 10 is used to condense the moisture in the gas and then transport it to the water tank 8 through the drain trough 9 to reduce the humidity in the gas; the evaporator 11 is used to The water evaporates, further reducing the humidity in the gas; the water tank 8 is connected to the gasification mixer 19 through the water suction pipe 15, which is used to transport water into the gasification mixer 19. The gasification mixer 19 is connected to the explosion chamber 36 through the air pump 20 and the return pipe, which is used to adjust the gas humidity (the adjustment process is to heat the water entering the water suction pipe 15 to form water vapor to increase the gas humidity, thereby humidifying the gas) and then return the adjusted gas to the explosion chamber 36 through the air pump 20; a first valve 14 is installed on the air intake pipe 13 between the fan 12 and the gasification mixer 19, and a second valve 16 and a water pump 17 are installed on the water suction pipe 15. The water pump 17 is used to provide power for transporting the water in the water tank 8 to the gasification mixer 19; a third valve 22 is installed at the connection between the air intake pipe 13 and the explosion chamber 36;

[0025] The data acquisition system includes a computer 32, a data acquisition instrument 33, an air pressure detection device, a temperature detection device, a humidity detection device and a first humidity detector 18. The first humidity detector 18 is installed in the gasification mixer 19 and is used to detect the gas humidity in the gasification mixer 19; the air pressure detection device, the temperature detection device and the humidity detection device are all installed in the explosion chamber 36, and are used to detect the air pressure, gas temperature and humidity in the explosion chamber 36 respectively; the data acquisition instrument 33 is connected to the computer 32, the air pressure detection device, the temperature detection device, the humidity detection device, the first humidity detector 18 and the second pressure gauge 6, and is used to obtain the data detected by the air pressure detection device, the humidity detection device, the first humidity detector 18 and the second pressure gauge 6 respectively, and feed it back to the computer 32 for storage; it also includes a high-speed camera 31, which is used to shoot the explosion situation in the explosion chamber 36 and feed it back to the data acquisition instrument 33. The air pressure detection device includes multiple pressure sensors, namely a first pressure sensor 27a, a second pressure sensor 27b and a third pressure sensor 27c, and the multiple pressure sensors are distributed at different positions of the explosion chamber 36; the humidity detection device includes multiple humidity detectors, namely a second humidity detector 28a, a third humidity detector 28b and a fourth humidity detector 28c, and the multiple humidity detectors are distributed at different positions of the explosion chamber 36; the temperature detection device includes multiple thermocouples, namely a first thermocouple 26a, a second thermocouple 26b and a third thermocouple 26c, and the multiple thermocouples are distributed at different positions of the explosion chamber 36.

[0026] As an improvement to the present invention, the opening and closing mechanism includes two movable plates and a baffle 24. The two movable plates are respectively mounted on the connection between the explosion chamber 36 and the dust chamber 34 via hinges. When the two movable plates are closed, the explosion chamber 36 and the dust chamber 34 are connected. When the two movable plates are rotated about the hinges to open, the baffle 24 passes through the connection between the explosion chamber 36 and the dust chamber 34 via the two movable plates, thereby disconnecting the explosion chamber 36 and the dust chamber 34. The two movable plates are respectively a first movable plate 29a and a second movable plate 29b. The first movable plate 29a is controlled to open and close by a first cylindrical pull rod 30a, and the second movable plate 29b is controlled to open and close by a second cylindrical pull rod 30b.

[0027] As another improvement of the present invention, the reflux pipe includes four reflux branches, one end of each reflux branch is connected to the air pump 20, and the other end extends into the explosion chamber 36 from different positions, and each reflux branch is provided with a valve, namely the fourth valve 21a, the fifth valve 21b, the sixth valve 21c and the seventh valve 21d; and the other end of each reflux branch is equipped with a nozzle, namely the first nozzle 23a, the second nozzle 23b, the third nozzle 23c and the fourth nozzle 23d.

[0028] First, assemble the utility model and start the experiment on the effect of ambient humidity on the explosion characteristics of dust cloud. The specific steps are as follows:

[0029] Step 1: According to the specific experimental requirements, start the high-pressure air bottle 1, appropriately adjust the pressure reducing valve 2 to the required air pressure, close the high-pressure air bottle 1, and turn on the high-speed camera 31, data acquisition instrument 33 and computer 32.

[0030] Step 2: Select a type of dust to be tested and place it into the dust bin 34. Push the first cylindrical pull rod 30a and the second cylindrical pull rod 30b inward to open the first movable plate 29a and the second movable plate b inward. Insert the baffle 24 to ensure that the explosion bin 36 and the dust bin 34 are disconnected and sealed, so that the dust bin 34 is not affected by the humidity in the explosion bin 36.

[0031] Step 3: Observe the second humidity detector 28a. If the ambient humidity is higher than the humidity to be measured, open the third valve 22 and the first valve 14, and close the second valve 16. The humid air in the explosion chamber 36 is condensed through the condenser 10, and the condensed water flows into the water tank 8 through the drain trough 9. The air is further dried by the evaporator. The dry air is transported to the gasification mixer 19 through the fan 12. Turn on the air pump 20, and the dry air enters the explosion chamber 37 through the first nozzle 23a, the second nozzle 23b, the third nozzle 23c, and the fourth nozzle 23d.

[0032] Step 4: Appropriately adjust the fourth valve 21a, the fifth valve 21b, the sixth valve 21c, and the seventh valve 21d. When the humidity values displayed by the second humidity detector 28a, the third humidity detector 28b, the fourth humidity detector 28c, and the first humidity detector 18 are all lower than the humidity to be measured, open the second valve 16 and the water pump 17 to introduce the water in the water tank 8 into the gasification mixer 19 through the suction pipe 15. Use the first humidity detector 18 to observe the humidity changes and adjust the water pump 17 appropriately so that the values of the second humidity detector 28a, the third humidity detector 28b, and the fourth humidity detector 28c reach the humidity to be measured and are stable.

[0033] Step 5. Quickly pull out the baffle 24, pull the first cylindrical pull rod 30a and the second cylindrical pull rod 30b outward to close the first movable plate 29a and the second movable plate 29b, connect the dust bin 34 and the explosion bin 36, close the third valve 22 and the air pump 20, quickly start the high-pressure air bottle 1, and start the ignition head 35 to ignite after the dust is sprayed to form a dust cloud in the explosion bin 36.

[0034] Step 6: The data from the high-speed camera 31, the first thermocouple 26a, the second thermocouple 26b, the third thermocouple 26c, the first pressure sensor 27a, the second pressure sensor 27b, the third pressure sensor 27c, the first humidity detector 28a, the second humidity detector 28b, the third humidity detector 28c, and the second pressure gauge 6 are collected by the data acquisition device 33 and transmitted to the computer 32.

[0035] Step 7. If the ambient humidity is lower than the humidity to be measured, there is no need to turn on the condenser 10 for condensation and the evaporator 11 for evaporation. Only the fan 12 needs to be turned on and steps 4 to 6 need to be repeated for humidification. This simulates environments with different humidity levels to conduct dust explosion experiments, which is used to explore the explosion status of the current dust under different humidity environments. If necessary, different types of dust can be replaced and the above experimental steps can be repeated to obtain the explosion status of different types of dust under different humidity environments. The corresponding data obtained provides data support for dust explosion prevention and industrial safety production.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An experimental device for evaluating the effect of ambient humidity on the explosion characteristics of dust clouds, characterized in that: Including explosion chamber, dust chamber, dust injection system, dehumidification and humidification system and data acquisition system; The explosion chamber is used to provide a dust cloud explosion environment. The dust chamber is connected to the explosion chamber and is used to hold the dust to be tested. An opening and closing mechanism is provided between the dust chamber and the explosion chamber. When the opening and closing mechanism is opened, the dust chamber and the explosion chamber are connected; when the opening and closing mechanism is closed, the dust chamber and the explosion chamber are disconnected. An ignition head is provided in the explosion chamber for igniting the dust cloud. The dust injection system includes a high-pressure air cylinder, a gas tank and a mushroom nozzle. A groove is provided in the dust bin, and the mushroom nozzle is installed in the groove. The high-pressure air cylinder is connected to the gas tank and the mushroom nozzle in sequence through a pipeline. The high-pressure air cylinder first buffers and reduces the pressure of the high-pressure gas in the gas tank and then transports it to the mushroom nozzle for spraying, so that the dust to be tested is blown up to form a dust cloud; a pressure reducing valve and a first pressure gauge are installed on the pipeline between the high-pressure air cylinder and the gas tank, the pressure reducing valve is used to reduce the pressure of the gas flowing through the pipeline, and the first pressure gauge is used to monitor the air pressure in the pipeline; an air valve and a second pressure gauge are installed on the pipeline between the gas tank and the mushroom nozzle, the air valve is used to control the on-off of the pipeline, and the second pressure gauge is used to monitor the air pressure in the pipeline; The dehumidification and humidification system includes an air inlet pipe, a condenser, an evaporator, a compressor, a fan, a water tank and a vaporization mixer. One end of the air inlet pipe is connected to the vaporization mixer and the other end is connected to the explosion chamber. The condenser, evaporator and fan are all installed in the air inlet pipe, and the condenser is closer to the explosion chamber, the fan is closer to the vaporization mixer, and the evaporator is between the condenser and the fan; the fan is used to pump the gas in the explosion chamber to the vaporization mixer, the condenser and the evaporator are both connected to the compressor, and the condenser is used to condense the moisture in the gas and then pass it through the drainage trough The gas is transported to the water tank; the evaporator is used to evaporate the water in the gas; the water tank is connected to the gasification mixer through a water suction pipe, which is used to transport water to the gasification mixer. The gasification mixer is connected to the explosion chamber through an air pump and a return pipe, which is used to adjust the gas humidity and then return the adjusted gas to the explosion chamber through the air pump; a first valve is installed on the air intake pipe between the fan and the gasification mixer, and a second valve and a water pump are installed on the water suction pipe. The water pump is used to provide power for transporting the water in the water tank to the gasification mixer; a third valve is installed at the connection between the air intake pipe and the explosion chamber; The data acquisition system includes a computer, a data acquisition instrument, an air pressure detection device, a temperature detection device, a humidity detection device and a first humidity detector. The first humidity detector is installed in the gasification mixer and is used to detect the gas humidity in the gasification mixer; the air pressure detection device, the temperature detection device and the humidity detection device are all installed in the explosion chamber and are used to detect the air pressure, gas temperature and humidity in the explosion chamber respectively; the data acquisition instrument is connected to the computer, the air pressure detection device, the temperature detection device, the humidity detection device, the first humidity detector and the second pressure gauge, and is used to obtain the data detected by the air pressure detection device, the humidity detection device, the first humidity detector and the second pressure gauge respectively, and feed it back to the computer for storage.

2. The experimental device for evaluating the influence of ambient humidity on the explosion characteristics of dust clouds according to claim 1, characterized in that: The explosion chamber includes four side panels and a top panel to form a rectangular body, wherein two opposite side panels are made of acrylic panels, and the remaining two side panels and the top panel are made of metal panels.

3. The experimental device for evaluating the influence of ambient humidity on the explosion characteristics of dust clouds according to claim 1, characterized in that: The opening and closing mechanism includes two movable plates and a baffle. The two movable plates are respectively installed at the connection between the explosion bin and the dust bin through hinges. When the two movable plates are closed, the explosion bin and the dust bin can be connected. When the two movable plates are rotated to open with the hinges as axes, the baffle passes through the connection between the explosion bin and the dust bin through the two movable plates, so as to disconnect the explosion bin and the dust bin.

4. The experimental device for evaluating the effect of ambient humidity on dust cloud explosion characteristics according to claim 1, characterized in that: The reflux pipe includes four reflux branches, one end of each reflux branch is connected to the air pump, and the other end extends into the explosion chamber from different positions. Each reflux branch is provided with a valve, and the other end of each reflux branch is equipped with a nozzle.

5. The experimental device for evaluating the influence of ambient humidity on the explosion characteristics of dust clouds according to claim 2, characterized in that: It also includes a high-speed camera, which is used to shoot the explosion situation in the explosion chamber and feed it back to the data acquisition device.

6. The experimental device for evaluating the effect of ambient humidity on dust cloud explosion characteristics according to claim 1, characterized in that: The air pressure detection device includes multiple pressure sensors, which are distributed at different positions in the explosion chamber; the humidity detection device includes multiple humidity detectors, which are distributed at different positions in the explosion chamber; the temperature detection device includes multiple thermocouples, which are distributed at different positions in the explosion chamber.

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