Explosion experiment measuring device based on spontaneous combustion ignition combustible gas

Abstract

The invention relates to the technical field of gas and dust explosion safety, and discloses an explosion experiment measuring device based on spontaneous combustion ignition combustible gas, the explosion experiment measuring device comprises a main body structure, the main body structure comprises a control host and a metal shell arranged on the side surface of the control host; a visual explosion system is arranged in the metal shell, a dust spontaneous combustion system, a temperature control system, a pressure acquisition system, an image acquisition system and a gas supply system are arranged on the visual explosion system, and the dust spontaneous combustion system, the temperature control system, the pressure acquisition system and the image acquisition system are electrically connected with a control host. A computer is arranged on the side face of the control host, a touch screen control panel and control keys are arranged on the front wall of the control host, a power switch, a power interface and a USB interface are arranged on the side wall of the control host, and the computer is connected with the control host through the USB interface; the device can measure parameters such as combustible gas explosion critical temperature, explosion pressure and the like caused by dust spontaneous combustion, and provides prevention and control reference data for combustible gas and dust coexistence places.

Description

Technical Field

[0001] The invention relates to the technical field of gas and dust explosion safety, and in particular to an explosion test measuring device based on spontaneous combustion ignition of combustible gas. Background Art

[0002] Dust accumulation usually occurs in coal plants, power plants, furniture factories, and metal products factories that transport, store, or process dust or other bulk materials. Once exposed to an oxidizing atmosphere and a mild heat source, the accumulated dust may self-heat to cause smoldering combustion. At the same time, some processes and production processes themselves exist in a combustible gas environment, such as the direct process route for the production of triethylaluminum, which uses aluminum powder, hydrogen, and ethylene as raw materials to synthesize triethylaluminum in two steps. Under certain conditions, the accumulation of combustible gases reaches a certain concentration, and the self-heating and self-ignition of the accumulated dust will cause instantaneous ignition, thereby igniting the combustible gas, causing a fire or explosion accident. The occurrence of an accident may cause significant casualties and property losses, and at the same time form a more serious negative impact.

[0003] At present, in some production processes where dust and combustible gases coexist, the research on the mechanism of the coupled disaster of dust and combustible gases is still incomplete, and there is a blank in the simulation experimental measurement device for the spontaneous combustion of dust and the ignition of combustible gas explosion. The traditional numerical simulation research method is difficult to truly reproduce the production process conditions where combustible gas and dust coexist, and the setting of dust spontaneous combustion parameters and combustible gas combustion or explosion parameters is too idealistic. Therefore, it is very important to further study the prevention and control of the coupled disasters of dust spontaneous combustion and combustible gas by independently designing and building a set of experimental measurement equipment for the ignition of combustible gas explosion by dust spontaneous combustion. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides an explosion experimental measurement device based on spontaneous combustion of combustible gas, which reveals the critical influencing temperature, explosion pressure, disaster mechanism, etc. of the explosion of spontaneous combustion of dust igniting combustible gas, and provides a reference for the effective prevention and control of explosion accidents.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: an explosion test measuring device based on spontaneous combustion of combustible gas, comprising a main structure, the main structure comprising a control host and a metal shell arranged on the side of the control host;

[0006] A visual explosion system is arranged in the metal shell, and a dust spontaneous combustion system, a temperature control system, a pressure acquisition system, an image acquisition system and an air supply system are arranged on the visual explosion system. The dust spontaneous combustion system, the temperature control system, the pressure acquisition system and the image acquisition system are electrically connected to the control host.

[0007] The beneficial effects of the present invention are as follows: the main structure of the device is composed of a control host and a metal shell. The design of the metal shell can not only provide good physical protection, but also effectively isolate the interference of the external environment on the experimental results. The design of the dust self-ignition system enables researchers to simulate the self-ignition behavior of dust of different concentrations and particle sizes under specific combustible gases and the process of self-ignition igniting the explosion of combustible gases. The temperature control system can perform staged temperature increase and accurately adjust the temperature of the experimental environment, providing the necessary conditions for studying the self-ignition ignition of combustible gases by dust. By real-time monitoring of temperature changes, researchers can better grasp the heat transfer characteristics during the self-ignition process. The pressure acquisition system is responsible for real-time monitoring of the pressure changes of the gas during the experiment. During the process of dust self-igniting and igniting the explosion of combustible gases, the pressure changes are often closely related to the reaction rate, reaction heat, and the diffusion characteristics of dust. Through high-frequency and high-resolution image acquisition, the image acquisition system allows researchers to observe subtle changes in the process of dust self-ignition igniting the explosion of combustible gases, such as smoke generation, flame propagation, flame structure, and other phenomena. These image data can not only be used for quantitative analysis, but also provide important visual evidence for subsequent model establishment and theoretical research. The design of the gas supply system ensures a stable supply of gas during the experiment, avoiding experimental errors caused by fluctuations in gas concentration. Using the Dalton partial pressure method to control the amount of combustible gas through the first high-frequency pressure sensor, the researchers were able to explore the characteristics of dust spontaneous combustion igniting combustible gas under different experimental conditions, providing a reference for safety assessment in practical applications.

[0008] Furthermore, in the explosion test measuring device based on spontaneous combustion of combustible gas, a computer is arranged on the side of the control host, a touch screen control panel and control buttons are arranged on the front wall of the control host, a power switch, a power interface and a USB interface are arranged on the side wall of the control host, and the computer and the control host are connected via the USB interface;

[0009] An end cover supporting and fixing device is arranged on the top of the metal shell, and the end cover supporting and fixing device comprises a metal cover plate arranged on the metal shell, a supporting shaft is arranged on the metal cover plate, a moon-shaped bayonet is arranged on the top of the supporting shaft, and the metal cover plate is connected to the metal shell by screws; an isolation door is arranged on the side wall of the metal shell, and the isolation door is movably connected to the metal shell by hinges, and a transparent glass window is arranged on the isolation door.

[0010] The beneficial effects of adopting the above further scheme are: the control host can realize the power supply, data transmission, setting and control of the running program of the natural ignition combustible gas explosion test measuring device. By connecting the computer to the control host through the USB interface, researchers can realize real-time data transmission and analysis, making the experimental process more efficient and intelligent. The touch screen control panel allows researchers to quickly adjust the experimental parameters and monitor the operating status of various systems through simple touch operations. The computer can receive data from various systems in real time, including temperature, pressure, etc. These data can be analyzed by professional software to generate detailed experimental reports and charts, providing researchers with a more comprehensive perspective and helping to deeply understand the mechanism of dust spontaneous combustion igniting combustible gas explosion. The setting of the end cover support fixture facilitates the placement of dust in the device and the purging of the device. A transparent glass window is set on the isolation door to facilitate the observation and image acquisition of the spontaneous combustion ignition combustible gas explosion process.

[0011] Furthermore, in the explosion experiment measuring device based on spontaneous combustion of combustible gas, the visualization explosion system includes a visualization explosion container, which includes a visualization cylindrical cavity, an explosion container end cover arranged on the top of the visualization cylindrical cavity, an explosion container chassis arranged on the bottom of the visualization cylindrical cavity, and a stabilizing support connecting the explosion container end cover and the explosion container chassis; the visualization cylindrical cavity is a high temperature and high pressure resistant quartz glass tube;

[0012] The end cover of the explosion container is connected to the visible cylindrical cavity through bolts and sealing gaskets, and the bottom plate of the explosion container is connected to the visible cylindrical cavity through bolts and sealing gaskets; an end cover lifting handle and an air intake and pressure relief system are provided on the end cover of the explosion container;

[0013] The air intake and pressure relief system comprises an air pipe arranged on the end cover of the explosion container, and a first branch pipe, a second branch pipe and a third branch pipe are arranged on the side wall of the air pipe; a combustible gas inlet is arranged at the end of the first branch pipe; an air inlet is arranged at the end of the second branch pipe; a branch pipe is arranged on the third branch pipe, and a manual pressure relief port and an automatic pressure relief port are arranged at both ends of the branch pipe respectively, and an automatic pressure relief valve is arranged on the side wall of the branch pipe close to the automatic pressure relief port.

[0014] The beneficial effects of adopting the above further scheme are as follows: the visualization cylindrical cavity adopts high temperature and high pressure resistant quartz glass tube material, which can withstand stress under high pressure environment. This transparency enables experimenters to monitor the flame propagation behavior of the spontaneous combustion of dust and ignition of combustible gas explosion in real time, and also enables the image acquisition system to capture the flame shape and propagation process inside the visualization cylindrical cavity. The stable connection between the container end cover and the chassis, through bolts and sealing gaskets, ensures the sealing and stability of the system, effectively prevents the leakage of combustible gas, and ensures the safety of the experiment. At the same time, the sealing design also helps to maintain the internal pressure and ensure the stability of the experimental conditions.

[0015] Through the air pipe, researchers can easily adjust the input of combustible gas and air to control the reaction. In addition, the manual pressure relief port and the automatic pressure relief port enable the rapid release of excessive pressure during the experiment to avoid equipment damage or safety accidents caused by excessive pressure. The introduction of the automatic pressure relief valve further enhances the intelligence of the system, and can automatically open when the pressure reaches the set value to ensure the safety of the experiment. The end cover lifting handle makes it easy for experimenters to quickly open and close the container when needed.

[0016] Furthermore, in the above-mentioned explosion experiment measuring device based on spontaneous combustion of combustible gas, the dust spontaneous combustion system includes a heating base arranged inside a visual cylindrical cavity, and a dust limiting device is arranged on the heating base; the dust limiting device is a movable circular ring, a concave boundary is arranged at the bottom of the movable circular ring, and a convex boundary matching the concave boundary is arranged on the heating base; the heating base is a circular shell structure, and is sealed and connected to the chassis of the explosion container by bolts.

[0017] The beneficial effect of adopting the above further solution is that by sealing the heating base with the container bottom plate, effective heat transfer and control are ensured. The concave boundary and the matching convex boundary prevent sliding. The heating base is made of stainless steel. The dust limiting device can be changed in height according to experimental needs, which is convenient for setting different initial dust amounts.

[0018] Furthermore, in the above-mentioned explosion experiment measuring device based on self-ignition of combustible gas, the temperature control system includes a temperature sensor arranged at the center position of the end cover of the explosion container and a high temperature source arranged inside the heating base, and the high temperature source and the temperature sensor are electrically connected to the touch screen control panel.

[0019] The beneficial effects of adopting the above further scheme are: the high temperature source sets the dust sample heating stage through the touch screen control panel, and controls the high temperature source to heat the dust sample in stages in combination with the programmed temperature rising method, while the temperature sensor monitors and feeds back the dust sample temperature in real time to realize the temperature rising control of the dust spontaneous combustion system.

[0020] Furthermore, in the above-mentioned explosion experiment measuring device based on spontaneous combustion of combustible gas, the pressure acquisition system includes a first high-frequency pressure sensor arranged on the side wall of the first branch pipe and a second high-frequency pressure sensor arranged on the top of the air pipe; the first high-frequency pressure sensor and the second high-frequency pressure sensor are electrically connected to the control host.

[0021] The beneficial effects of adopting the above further scheme are: using the Dalton partial pressure method through the first high-frequency pressure sensor to monitor the amount of combustible gas rushing into the explosion container; the second high-frequency pressure sensor tests the pressure generated on the end cover of the explosion container by the shock wave generated by the explosion of combustible gas ignited by spontaneous combustion of dust, and combining program control and data acquisition to collect explosion pressure data.

[0022] Furthermore, in the above-mentioned explosion experiment measuring device based on spontaneous combustion of combustible gas, the image acquisition system includes a high-speed camera arranged on the front side of the metal shell, and the high-speed camera is electrically connected to the control host and the computer.

[0023] The beneficial effects of adopting the above further scheme are: the visualized cylindrical cavity is a high temperature and high pressure resistant quartz glass tube, and the changes of the explosion flame of the combustible gas ignited under the condition of dust spontaneous combustion are collected by a high-speed camera. By electrically connecting the high-speed camera to the control host and the computer, the high-speed camera can be controlled by program control and the computer.

[0024] Furthermore, in the above-mentioned explosion test measuring device based on spontaneous combustion of combustible gas, the gas supply system includes a gas cylinder arranged on the side of the metal shell, and the gas cylinder is connected to the combustible gas inlet through a conduit.

[0025] The beneficial effect of adopting the above further scheme is that the setting of the gas cylinder provides a stable and controllable gas supply source, ensures the flow rate of the combustible gas during the experiment, and avoids experimental errors caused by fluctuations in gas concentration.

[0026] The beneficial effects of the present invention are as follows: the device sets the temperature rise stage through the touch screen control panel inside the dust spontaneous combustion system, and combines the programmed temperature rise method to perform staged temperature rise on the dust sample. When the values ​​of the high-frequency pressure sensor and temperature sensor inside the visual explosion system suddenly rise and are accompanied by light, loud noise, and the opening of the automatic pressure relief valve, it means that the dust sample self-heats and ignites the combustible gas in the visual explosion container, causing the explosion. The spontaneous combustion ignition of combustible gas explosion experimental measurement device can be used to measure the critical temperature and explosion pressure of combustible gas explosion caused by dust spontaneous combustion, providing reference data for disaster prevention and control in places where dust / combustible gas coexist. The present invention creates a spontaneous combustion ignition of combustible gas explosion experimental measurement device, which fills the gap in the testing of relevant parameters of the ignition of combustible gas explosion under the state of dust spontaneous combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the test device for spontaneous combustion and ignition of combustible gas explosion;

[0028] Figure 2 This is a front view of the test device for spontaneous combustion and ignition of combustible gas explosion;

[0029] Figure 3 This is the rear view of the test device for spontaneous combustion and ignition of combustible gas explosion;

[0030] Figure 4 A schematic diagram of a visual explosion container device;

[0031] Figure 5 To visualize the cross-section of the explosion containment device;

[0032] Among them: 1 control host; 1-1 USB interface; 1-2 automatic pressure relief valve data interface; 1-3 explosion pressure data interface; 1-4 space pressure data interface; 1-5 dust temperature data interface; 1-6 touch screen control panel; 1-7 control button; 1-8 power switch; 1-9 power interface; 2 end cover support fixture; 2-1 support shaft; 2-2 moon-shaped bayonet; 2-3 metal cover; 2-4 screws; 3 metal shell; 3-1 isolation door; 3-2 isolation door handle; 3-3 threaded switch; 3-4 transparent glass window; 3-5 movable hinge; 4 visual explosion container; 4-1 end cover Lifting handle; 4-2 temperature sensor; 4-3 explosion container end cover; 4-4 visualization cylindrical cavity; 4-5 explosion container chassis; 4-6 stabilizing pillar; 4-7 dust restriction device; 4-8 heating base; 4-9 temperature control interface; 5-1 combustible gas inlet; 5-2 first high-frequency pressure sensor; 5-3 second high-frequency pressure sensor; 5-4 air inlet; 6-1 manual pressure relief port; 6-2 automatic pressure relief valve; 6-3 automatic pressure relief port; 7 high-speed camera; 8 computer; 9 gas cylinder; 10, gas pipe; 11, first branch pipe; 12, second branch pipe; 13, third branch pipe; 14, branch pipe. DETAILED DESCRIPTION

[0033] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0034] like Figure 1 As shown, this embodiment provides an explosion test measuring device based on spontaneous combustion of combustible gas, which simulates the explosion dynamics process of spontaneous combustion of dust and ignition of combustible gas under actual working conditions to study its spontaneous combustion characteristics, critical temperature, changes in explosion pressure and visualization process. The device includes a main structure, which includes a control host 1 and a metal shell 3 arranged on the side of the control host 1; the control host 1 is the core of the entire device and is responsible for data processing, instruction sending and coordinated operation of various systems. The metal shell 3 serves as a protective shell of the experimental container, provides a stable working environment, and is provided with multiple functional areas to meet experimental needs.

[0035] A visual explosion system is arranged in the metal shell 3, and a dust spontaneous combustion system, a temperature control system, a pressure acquisition system, an image acquisition system and an air supply system are arranged on the visual explosion system. The dust spontaneous combustion system, the temperature control system, the pressure acquisition system and the image acquisition system are electrically connected to the control host 1 to realize real-time transmission of data and reception and execution of instructions.

[0036] A computer 8 is arranged on the side of the control host 1 for storing experimental data, analyzing experimental results and monitoring various experimental parameters of the visual explosion system. An automatic pressure relief valve data interface 1-2, an explosion pressure data interface 1-3, a space pressure data interface 1-4 and a dust temperature data interface 1-5 are arranged on the top of the control host 1, so as to enable the control host 1 to monitor and receive data on the explosion pressure, temperature, etc. A touch screen control panel 1-6 and control buttons 1-7 are arranged on the front wall of the control host 1, and a power switch 1-8, a power interface 1-9 and a USB interface 1-1 are arranged on the side wall. The computer 8 and the control host 1 are connected via the USB interface 1-1;

[0037] An end cover supporting and fixing device 2 is arranged on the top of the metal shell 3, and the end cover supporting and fixing device 2 includes a metal cover plate 2-3 arranged on the metal shell 3, a supporting shaft 2-1 is arranged on the metal cover plate 2-3, a moon-shaped bayonet 2-2 is arranged on the top of the supporting shaft 2-1, the metal cover plate 2-3 is connected to the metal shell 3 by screws 2-4, and the arrangement of the end cover supporting and fixing device 2 is convenient for the placement of dust in the device and the purging of the visual explosion container 4; an isolation door 3-1 is arranged on the side wall of the metal shell 3, and the isolation door 3-1 is movably connected to the metal shell 3 by hinges, and a transparent glass window 3-4, an isolation door handle 3-2 and a threaded switch 3-3 are arranged on the isolation door 3-1, and the transparent glass window 3-4 is convenient for the experimenter to observe the experimental phenomenon without opening the isolation door 3-1, and is also convenient for the image acquisition system to acquire the reaction state inside the visual cylindrical cavity 4-4.

[0038] The visualization explosion system includes a visualization explosion container 4, which includes a visualization cylindrical cavity 4-4, an explosion container end cover 4-3 arranged at the top of the visualization cylindrical cavity 4-4, an explosion container chassis 4-5 arranged at the bottom of the visualization cylindrical cavity 4-4, and a stabilizing support 4-6 connecting the explosion container end cover 4-3 and the explosion container chassis 4-5; the visualization cylindrical cavity 4-4 is a high temperature and high pressure resistant glass tube;

[0039] The explosion container end cover 4-3 is connected to the visualization cylindrical cavity 4-4 by bolts and sealing gaskets, and the explosion container chassis 4-5 is connected to the visualization cylindrical cavity 4-4 by bolts and sealing gaskets; the explosion container end cover 4-3 is provided with an end cover lifting handle 4-1 and an air intake and pressure relief system;

[0040] The air intake and pressure relief system includes an air pipe 10 arranged on the end cover 4-3 of the explosion container, and a first branch pipe 11, a second branch pipe 12 and a third branch pipe 13 are arranged on the side wall of the air pipe 10; a combustible gas inlet 5-1 is arranged at the end of the first branch pipe 11; an air inlet 5-4 is arranged at the end of the second branch pipe 12; a branch pipe 14 is arranged on the third branch pipe 13, and a manual pressure relief port 6-1 and an automatic pressure relief port 6-3 are arranged at both ends of the branch pipe 14, and an automatic pressure relief valve 6-2 is arranged on the side wall of the branch pipe 14 near the automatic pressure relief port 6-3.

[0041] The dust spontaneous combustion system includes a heating base 4-8 arranged inside a visual cylindrical cavity 4-4, on which a dust limiting device 4-7 is arranged; the dust limiting device 4-7 is a movable ring, a concave boundary is arranged at the bottom of the movable ring, and a convex boundary matching the concave boundary is arranged on the heating base 4-8; the heating base 4-8 is a circular shell structure, and is sealed and connected to the explosion container chassis 4-5 by bolts.

[0042] The temperature control system includes a temperature sensor 4-2 arranged at the center of the explosion container end cover 4-3 and a high temperature source arranged inside the heating base 4-8. The high temperature source and the temperature sensor 4-2 are electrically connected to the touch screen control panel 1-6. The control host 1 controls the high temperature source contained in the heating base 4-8 through a wire to heat the dust by self-heating. At the same time, the temperature is monitored in real time and positive feedback is provided through the temperature sensor 4-2 above the dust. The temperature control system decomposes the heating process into multiple stages through the stage heating method of the heating program. The temperature sensor 4-2 monitors the temperature reached by the self-ignition of the dust. The temperature rise stage and heating rate can be set through the touch screen control panel 1-6, and up to 5 groups of stage temperatures can be set.

[0043] The pressure acquisition system includes a first high-frequency pressure sensor 5-2 arranged on the side wall of the first branch pipe 11 and a second high-frequency pressure sensor 5-3 arranged on the top of the air pipe 10; the first high-frequency pressure sensor 5-2 and the second high-frequency pressure sensor 5-3 are electrically connected to the control host 1. The first high-frequency pressure sensor 5-2 determines the amount of combustible gas rushing into the explosion container by the Dalton partial pressure method; the second high-frequency pressure sensor 5-3 tests the pressure generated by the shock wave generated by the explosion of the combustible gas ignited by the spontaneous combustion of dust on the end cover 4-3 of the explosion container, and cooperates with the data control and data acquisition system to monitor the inflation and automatic pressure relief of the combustible gas in the visualization explosion container 4, and measure the explosion pressure of the combustible gas ignited by the spontaneous combustion of dust.

[0044] The image acquisition system includes a high-speed camera 7 arranged on the front side of the metal shell 3, and the high-speed camera 7 is electrically connected to the control host 1 and the computer 8. The high-speed camera 7 can trigger the high-speed camera 7 to shoot synchronously with the combustion and explosion. Monitor whether there is a flame of spontaneous combustion of dust igniting the explosion of combustible gas inside the visual explosion container 4, and collect the flame propagation characteristics and shape of the spontaneous combustion of dust igniting the explosion of combustible gas inside the visual explosion container 4. According to the collected flame and the change of overpressure in the visual explosion container 4 over time, the influence of the pressure of the spontaneous combustion of dust igniting the explosion of combustible gas on the flame can be explored.

[0045] The gas supply system includes a gas cylinder 9 arranged on the side of the metal shell 3, and the gas cylinder 9 is connected to the combustible gas inlet 5-1 through a conduit. The concentration of different combustible premixed gases is determined by Dalton's law of partial pressure. The vacuum pump is connected to the air inlet 5-4 of the visual explosion container to achieve the setting of the vacuum degree inside the container, and then adjust the initial pressure in the spontaneous combustion ignition combustible gas explosion experimental measuring device. The gas cylinder 9 is connected to the combustible gas inlet 5-1 through a conduit, which can realize the filling of combustible gas, and air is filled through the air inlet 5-4.

[0046] Determination of the occurrence of explosion caused by spontaneous combustion of combustible gas: The occurrence of explosion can be determined based on the sudden increase in the values ​​monitored by the temperature sensor 4-2 and the second high-frequency pressure sensor 5-3, and the appearance of light and brightness inside the visual explosion system accompanied by a violent sound. The time when the values ​​monitored by the temperature sensor 4-2 and the second high-frequency pressure sensor 5-3 suddenly increase is the time when the explosion starts.

[0047] The working process of the device of the present invention is as follows:

[0048] Check the spontaneous combustion ignition combustible gas explosion test measurement device to ensure that all systems and pipelines are connected properly; check the device body to ensure that it has good air tightness, check and debug the program control and data acquisition system to ensure that it can effectively and accurately control the program and collect data;

[0049] Dust of a certain mass is placed at the heating base 4-8 at the bottom of the visualization explosion container 4, and the explosion container end cover 4-3 above the visualization explosion container 4 is fixed and sealed by bolts.

[0050] The vacuum pump and the valve connected to the visual explosion container 4 are turned on, and the visual explosion container 4 is evacuated to achieve different vacuum degrees inside the visual explosion container 4, and the first high-frequency pressure collector is used for monitoring to ensure that the combustible gas and air of a certain concentration are filled to a normal pressure state. Then, the valve connected to the vacuum pump and the visual explosion container 4 is closed.

[0051] According to the concentration of the combustible gas and the volume of the visual explosion container 4, the pressure occupied by the combustible gas is determined in combination with the Dalton partial pressure method. The combustible gas cylinder 9 is connected to the combustible gas inlet 5-1 through a conduit. The combustible gas inlet 5-1 valve is opened to allow the combustible gas to enter the visual explosion container 4. The increased pressure of the combustible gas entering is determined according to the first high-frequency pressure sensor 5-2. After closing the combustible gas inlet 5-1 valve, open the air inlet 5-4 valve to allow air to enter. When the pressure in the first high-frequency pressure sensor 5-2 reaches normal pressure, close the air inlet 5-4 valve and let it stand for 5 minutes to ensure that the premixed gas in the explosion container is uniform.

[0052] By controlling the heating program in the host 1, the program control and data acquisition system, and the synchronous controller, a plurality of different heating stages and heating rates are set on the touch screen control panel 1-6, the dust is heated in stages, and the dust temperature is monitored by the temperature sensor 4-2. At the same time, the synchronous controller, the program control and the data acquisition system are used to control and collect the temperature.

[0053] The opening of the high-speed camera 7 and the collection of image data are controlled by the program control and data acquisition system and the synchronous controller; the image is collected to visualize the flame morphology development process after the dust in the explosion container 4 spontaneously ignites the combustible gas.

[0054] The program control and data acquisition system and the synchronous controller control the second high-frequency pressure sensor 5-3 to collect data on the explosion pressure, and determine the maximum pressure generated by the spontaneous combustion of dust igniting the combustible gas explosion.

[0055] The program control and data acquisition system and the synchronous controller control the temperature sensor 4-2 to start the collection of temperature data, and determine the critical temperature of the spontaneous combustion of dust to ignite the combustible gas and the maximum temperature produced by the explosion.

[0056] After the explosion is completed, the device automatically opens the pressure relief ball valve to release pressure.

[0057] The vacuum cleaner is turned on to purge the explosion products inside the visualization explosion container 4 so that the explosion products are replaced with fresh air from the outside. Meanwhile, the container is cooled to room temperature before starting the next set of experiments.

[0058] Although the specific implementation of the present invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. An explosion test measuring device based on spontaneous combustion of combustible gas, characterized in that: The main structure comprises a control host (1) and a metal shell (3) arranged on the side of the control host (1); A visual explosion system is arranged in the metal shell (3); a dust spontaneous combustion system, a temperature control system, a pressure acquisition system, an image acquisition system and an air supply system are arranged on the visual explosion system; and the dust spontaneous combustion system, the temperature control system, the pressure acquisition system and the image acquisition system are electrically connected to the control host (1).

2. The explosion test measuring device based on spontaneous combustion of combustible gas according to claim 1 is characterized in that: A computer (8) is arranged on the side of the control host (1), a touch screen control panel (1-6) and control buttons (1-7) are arranged on the front wall of the control host (1), a power switch (1-8), a power interface (1-9) and a USB interface (1-1) are arranged on the side wall of the control host (1), and the computer (8) and the control host (1) are connected via the USB interface (1-1); An end cover support and fixing device (2) is arranged on the top of the metal shell (3), and the end cover support and fixing device (2) comprises a metal cover plate (2-3) arranged on the metal shell (3), a support shaft (2-1) is arranged on the metal cover plate (2-3), a moon-shaped bayonet (2-2) is arranged on the top of the support shaft (2-1), and the metal cover plate (2-3) and the metal shell (3) are connected by screws (2-4); an isolation door (3-1) is arranged on the side wall of the metal shell (3), and the isolation door (3-1) and the metal shell (3) are movably connected by hinges, and a transparent glass window (3-4) is arranged on the isolation door (3-1).

3. The explosion test measuring device based on spontaneous combustion of combustible gas according to claim 1 is characterized in that: The visualized explosion system comprises a visualized explosion container (4), wherein the visualized explosion container (4) comprises a visualized cylindrical cavity (4-4), an explosion container end cover (4-3) arranged at the top of the visualized cylindrical cavity (4-4), an explosion container chassis (4-5) arranged at the bottom of the visualized cylindrical cavity (4-4), and a stabilizing support (4-6) connecting the explosion container end cover (4-3) and the explosion container chassis (4-5); the visualized cylindrical cavity (4-4) is a high temperature and high pressure resistant quartz glass tube; The explosion container end cover (4-3) is connected to the visible cylindrical cavity (4-4) via bolts and sealing gaskets, and the explosion container chassis (4-5) is connected to the visible cylindrical cavity (4-4) via bolts and sealing gaskets; the explosion container end cover (4-3) is provided with an end cover lifting handle (4-1) and an air intake and pressure relief system; The air intake and pressure relief system comprises an air pipe (10) arranged on an end cover (4-3) of the explosion container, and a first branch pipe (11), a second branch pipe (12) and a third branch pipe (13) are arranged on the side wall of the air pipe (10); a combustible gas inlet (5-1) is arranged at the end of the first branch pipe (11); an air inlet (5-4) is arranged at the end of the second branch pipe (12); a branch pipe (14) is arranged on the third branch pipe (13), and a manual pressure relief port (6-1) and an automatic pressure relief port (6-3) are arranged at both ends of the branch pipe (14), and an automatic pressure relief valve (6-2) is arranged on the side wall of the branch pipe (14) close to the automatic pressure relief port (6-3).

4. The explosion test measuring device based on spontaneous combustion of combustible gas according to claim 3 is characterized in that: The dust spontaneous combustion system comprises a heating base (4-8) arranged inside a visual cylindrical cavity (4-4), and a dust limiting device (4-7) is arranged on the heating base (4-8); the dust limiting device (4-7) is a movable circular ring, a concave boundary is arranged at the bottom of the movable circular ring, and a convex boundary matching the concave boundary is arranged on the heating base (4-8); the heating base (4-8) is a circular shell structure, and is sealed and connected to the explosion container chassis (4-5) by bolts.

5. The explosion test measuring device based on spontaneous combustion of combustible gas according to claim 3 is characterized in that: The temperature control system comprises a temperature sensor (4-2) arranged at the center of the explosion container end cover (4-3) and a high temperature source arranged inside the heating base (4-8); the high temperature source and the temperature sensor (4-2) are electrically connected to the touch screen control panel (1-6).

6. The explosion test measuring device based on spontaneous combustion of combustible gas according to claim 3 is characterized in that: The pressure acquisition system comprises a first high-frequency pressure sensor (5-2) arranged on the side wall of the first branch pipe (11) and a second high-frequency pressure sensor (5-3) arranged on the top of the trachea (10); the first high-frequency pressure sensor (5-2) and the second high-frequency pressure sensor (5-3) are electrically connected to the control host (1).

7. The explosion test measuring device based on spontaneous combustion of combustible gas according to claim 3 is characterized in that: The image acquisition system comprises a high-speed camera (7) arranged on the front side of the metal housing (3); the high-speed camera (7) is electrically connected to a control host (1) and a computer (8).

8. The explosion test measuring device based on spontaneous combustion of combustible gas according to claim 3 is characterized in that: The gas supply system comprises a gas cylinder (9) arranged on the side of the metal shell (3); the gas cylinder (9) is connected to the combustible gas inlet (5-1) via a conduit.

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