Device and method for testing spontaneous combustion of metal dust in case of heat

Abstract

The invention provides a device and a method for testing spontaneous combustion of metal dust when heated, and relates to the technical field of material testing. The device comprises a heating pipe, a cover body, a plurality of temperature probes, a monitoring assembly and a control unit. According to the test device for the spontaneous combustion of the metal dust when heated, through the combined design of the heating pipe and the heating plate, the metal dust is heated from different positions, the temperatures of different areas in the reaction chamber are detected through the multiple temperature probes, and then the heating power of the heating pipe and the heating plate is independently adjusted based on the temperatures; the temperature of different areas in the reaction chamber can be accurately controlled, and the uniformity of the temperature of the metal dust is improved. And by arranging the graphite inner pipe, the thermal insulation performance is improved. By arranging the metal outer pipe, the anti-explosion performance is enhanced, leakage or fracture is avoided, gas leakage or device damage is avoided, and the test safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material testing, and particularly to a test device and a test method for the spontaneous combustion of metal dust upon heating. Background Art

[0002] Metal dust is widely used in industrial production, which provides support for improving production efficiency and technological innovation. However, due to its unique physical and chemical properties, it is extremely prone to combustion or explosion accidents under specific conditions. Especially active metal dust such as aluminum powder and magnesium powder has a high specific surface area and reactivity, and is very likely to cause serious safety accidents once it encounters high temperature or open fire. Therefore, it is necessary to study the spontaneous combustion characteristics of metal dust.

[0003] Currently, the research methods for the spontaneous combustion characteristics of metal dust mainly include numerical simulation and experimental research. Although numerical simulation can provide certain theoretical guidance, experimental research is still an important means to verify and explore the combustion mechanism of metal dust.

[0004] However, existing experimental devices usually heat the dust through a heater. Under high temperature and high pressure conditions, traditional experimental devices are prone to leakage or rupture. Especially when the heating and gas control units are not fully optimized, this may lead to gas leakage or device damage, making it difficult to ensure the safety of the test. Summary of the Invention

[0005] In order to solve the technical problem that in the prior art, under high temperature and high pressure conditions, traditional experimental devices are prone to leakage or rupture, especially when the heating and gas control units are not fully optimized, this may lead to gas leakage or device damage, making it difficult to ensure the safety of the test, the embodiments of the present invention provide a test device and a test method for the spontaneous combustion of metal dust upon heating. The technical solutions are as follows:

[0006] On the one hand, a test device for the spontaneous combustion of metal dust upon heating is provided, and the device includes:

[0007] A heating tube, the heating tube includes, from inside to outside in sequence: a graphite inner tube, a heat insulation layer, and a metal outer tube. Among them, a threaded groove is provided on the outer wall of the graphite inner tube, a heating wire is bundled in the threaded groove, and the graphite inner tube is connected to the metal outer tube through a clamping member;

[0008] A heating plate, the heating plate is arranged at the first end of the heating tube to form a reaction chamber with the heating plate;

[0009] A cover body, the cover body is provided at the second end of the graphite inner tube in an openable and closable manner;

[0010] Multiple temperature probes, a plurality of the temperature probes are evenly spaced and embedded in the wall of the graphite inner tube, and the needle heads of the temperature probes are located in the reaction chamber;

[0011] A monitoring component, the monitoring component is arranged on the cover body;

[0012] A control unit, the control unit is communicatively connected to the heating tube, the heating plate, the plurality of temperature probes, and the monitoring component. The monitoring component is used to send monitoring information to the control unit, and the control unit is further used to respectively control the heating power of the heating tube and the heating plate according to the temperature information sent by the plurality of temperature probes.

[0013] Optionally, the temperature probe is embedded in the wall of the graphite inner tube through the threaded groove.

[0014] Optionally, the lengths of the plurality of temperature probes are different, so that the needle heads of the plurality of temperature probes are located at different positions from the center to the inner wall of the graphite inner tube.

[0015] Optionally, the control unit includes: a first temperature controller and a second temperature controller;

[0016] The first temperature controller is connected to the heating wire, the heating wire includes multiple sections of cable wires, and the first temperature controller is used to independently control each section of the cable wire;

[0017] The second temperature controller is connected to the heating plate through a transformer.

[0018] Optionally, a gas sampling port is further arranged on the wall of the graphite inner tube, and a gas sampling component is arranged on the gas sampling port;

[0019] The gas sampling component is communicatively connected to the control unit.

[0020] Optionally, the cover body includes an explosion-proof glass viewing window.

[0021] Optionally, the monitoring component includes: a camera, and the camera is arranged above the explosion-proof glass viewing window.

[0022] Optionally, the monitoring component includes: a thermal imaging probe, and the thermal imaging probe is arranged on the inner wall of the cover body.

[0023] Optionally, the material of the metal outer tube is 316L stainless steel.

[0024] On the other hand, a test method for spontaneous combustion of metal dust when heated is provided, and the method includes:

[0025] Through the control unit, the heating tubes and the heating plates are controlled to gradually increase the heating power, and the reaction chamber formed between the heating tubes and the heating plates is filled with metal dust;

[0026] Obtain the monitoring information sent by the monitoring component;

[0027] According to the temperature information sent by multiple temperature probes, control the heating power of the heating tubes and the heating plates respectively;

[0028] According to the monitoring information and the temperature information, obtain the influence of different temperatures and environmental conditions on the combustion behavior of metal dust.

[0029] The beneficial effects brought by the technical solution provided by the embodiment of the present invention at least include:

[0030] The test device for spontaneous combustion of metal dust when heated provided by the embodiment of the present invention, through the combined design of heating tubes and heating plates, heats the metal dust from different positions, and detects the temperatures of different regions in the reaction chamber through multiple temperature probes. Furthermore, based on the temperature, the heating power of the heating tubes and the heating plates is independently adjusted, which can achieve precise control of the temperatures of different regions in the reaction chamber and improve the temperature uniformity of the metal dust. By setting the graphite inner tube, the heat preservation performance is improved. By setting the metal outer tube, the explosion resistance performance is enhanced, avoiding leakage or rupture, preventing gas leakage or device damage, and improving the safety of the test. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of a test device for spontaneous combustion of metal dust when heated provided by the embodiment of the present invention;

[0033] Figure 2 It is a flowchart of a test method for spontaneous combustion of metal dust when heated provided by the embodiment of the present invention.

[0034] Reference Signs:

[0035] 1. Heating tube; 11. Graphite inner tube; 111. Threaded groove; 112. Heating wire; 12. Heat preservation layer; 13. Metal outer tube; 14. Clamping part;

[0036] 2. Heating plate;

[0037] 3. Cover body; 31. Explosion-proof glass viewing window;

[0038] 4. Temperature probe;

[0039] 5. Monitoring component; 51. Camera; 52. Thermal imaging probe;

[0040] 6. Control unit; 61. Temperature data acquisition processor; 62. Computer; 63. First temperature controller; 64. Second temperature controller; 65. Transformer. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0042] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0043] The structure of the existing technology still has many deficiencies in terms of temperature control, multi-point temperature measurement, reaction phenomenon observation and experimental safety:

[0044] Limitations of temperature control: Traditional devices usually use a single heating structure. Due to the accumulation level and density differences of metal dust, it is easy to cause uneven heating, with some areas having too high temperatures while other areas having low temperatures, thus affecting the accuracy of the experiment. It is impossible to achieve independent heating of different areas, resulting in uneven temperature distribution. A single heating method is difficult to simulate the temperature changes and complex conditions in the actual environment, which limits the comprehensive study of the spontaneous combustion characteristics of accumulated dust.

[0045] Inaccurate temperature distribution measurement: Many devices can only measure the temperature of a single point and cannot obtain the temperature field information of the entire experimental area in real time. This limitation makes it impossible to fully understand the temperature changes of accumulated dust at different locations, which in turn affects the dynamic analysis of the spontaneous combustion reaction process. The lack of accurate monitoring of temperature distribution limits the in-depth study of the heating process and dust reaction behavior.

[0046] Low safety performance: Under high temperature and high pressure conditions, traditional experimental devices are prone to leakage or rupture, especially when the heating and gas control units are not fully optimized. Since the spontaneous combustion experiment of accumulated dust involves high temperatures and pressures, the sealing and pressure resistance of the device become key. If the equipment fails to effectively withstand the challenges of high temperature and high pressure, it may cause gas leakage or device damage, leading to safety accidents.

[0047] Limited observation conditions: Some devices lack effective observation windows, resulting in the inability to monitor reaction phenomena and flame changes in real time during the experiment. This prevents researchers from obtaining key experimental data in a timely manner, limiting the intuitive analysis and dynamic adjustment of the spontaneous combustion process of accumulated dust. The lack of an observation window also restricts the recording and analysis of key features such as the timing of the reaction and flame propagation.

[0048] Metal dusts (such as aluminum powder and magnesium powder) are widely used in industrial production. However, due to their high specific surface area and reactivity, they are extremely prone to combustion or explosion accidents under specific conditions.

[0049] To make the technical problems, technical solutions, and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0050] An embodiment of the present invention provides a test device for the spontaneous combustion of metal dust upon heating. Figure 1 It is a schematic structural diagram of a test device for the spontaneous combustion of metal dust upon heating provided by an embodiment of the present invention. Please refer to Figure 1 , the device includes: a heating tube 1, a heating plate 2, a cover 3, a plurality of temperature probes 4, a monitoring component 5, and a control unit 6. Among them, the heating tube 1 and the heating plate 2 form a reaction chamber for accommodating the reaction of metal dust and are sealed by the cover 3. The plurality of temperature probes 4 are used to detect the temperatures in different regions of the reaction chamber and send them to the control unit 6. The monitoring component 5 is used to monitor the reaction conditions of the metal dust and send them to the control unit 6. The control unit 6 controls the heating power of the independent heating tube 1 and the heating plate 2 to adjust the temperatures in different regions of the reaction chamber. Based on this device, a test for the spontaneous combustion of metal dust upon heating is realized.

[0051] Specifically, the heating tube 1 includes, from the inside to the outside in sequence: a graphite inner tube 11, a heat insulation layer 12, and a metal outer tube 13. Among them, a threaded groove 111 is provided on the outer wall of the graphite inner tube 11, and a heating wire 112 is bundled in the threaded groove 111. The graphite inner tube 11 and the metal outer tube 13 are connected by a clamping member 14.

[0052] The graphite inner tube 11, as the innermost layer structure of the heating tube 1, is not only heat-resistant but also can effectively transfer heat due to its good thermal conductivity, ensuring that the metal dust in the reaction container is heated evenly and avoiding local overheating or uneven temperature, thus simulating a real metal dust reaction environment. The threaded groove 111 is designed on the outer wall of the graphite inner tube 11, which not only increases the surface area but also provides a stable attachment point for the heating wire 112. The heating wire 112 is used to ensure that heat can be transferred evenly and efficiently to the graphite inner tube 11 and its internal space.

[0053] The main function of the thermal insulation layer 12 is to reduce heat loss and improve the heating efficiency. The metal outer tube 13 is used to provide structural support and protection, enhance the anti-explosion performance and structural strength of the device, prevent structural rupture under high-temperature and high-pressure conditions, and achieve high-temperature and anti-explosion performance. The graphite inner tube 11 and the metal outer tube 13 are stably connected through the engaging member 14 to ensure the integrity and safety of the structure. The engaging member 14 is used to connect the graphite inner tube 11 and the metal outer tube 13 to ensure a tight fit between the two, and at the same time facilitate installation and maintenance.

[0054] This design combines the high thermal conductivity of the graphite inner tube 11 and the anti-explosion property of the metal outer tube 13 to achieve the safe operation of the test device under high-temperature and high-pressure conditions, while ensuring the heat transfer efficiency in the metal dust reaction area and improving the accuracy and safety of the experiment.

[0055] The heating plate 2 is arranged at the first end of the heating tube 1. The heating plate 2 can provide uniform heating to form a reaction chamber with the heating plate 2 for the spontaneous combustion of metal dust when heated.

[0056] The cover 3 is movably arranged at the second end of the graphite inner tube 11 to ensure the airtightness and safety during the experiment. The cover 3 can also be used for sampling.

[0057] A plurality of temperature probes 4 are evenly spaced and embedded in the wall of the graphite inner tube 11 to achieve multi-point temperature measurement. The needle heads of the temperature probes 4 are located in the reaction chamber to detect the temperatures in different areas of the reaction chamber.

[0058] The monitoring component 5 is arranged on the cover 3 to monitor the reaction phenomenon of the metal dust and the flame change.

[0059] The control unit 6 is communicatively connected to the heating tube 1, the heating plate 2, the plurality of temperature probes 4, and the monitoring component 5. The monitoring component 5 is used to send the monitoring information to the control unit 6 for the experimenter to analyze.

[0060] The control unit 6 is also used to respectively control the heating power of the heating tube 1 and the heating plate 2 according to the temperature information sent by the plurality of temperature probes 4 to achieve independent heating control of different areas.

[0061] For example, when the temperature at a position close to the first end is low, the heating power of the heating plate 2 can be increased to ensure that the temperatures in different areas change stably within a predetermined range, and to uniformly heat the metal dust to enhance the heating effect.

[0062] The orientations of the above-mentioned heating plate 2 and heating tube 1 can be designed according to needs. For example, the heating plate 2 can be arranged at the bottom of the heating tube 1 to provide uniform heat to the bottom of the metal dust.

[0063] Moreover, the control unit 6 can set different heating strategies according to experimental requirements. For example, the heating of the bottom and side walls can adopt independent temperature control methods respectively, and the heating intensity can be dynamically adjusted according to the reaction process to simulate different metal dust reaction environments.

[0064] The test device for spontaneous combustion of metal dust when heated provided by the embodiment of the present invention, through the combined design of the heating tube 1 and the heating plate 2, heats the metal dust from different positions, and detects the temperatures of different regions in the reaction chamber through multiple temperature probes 4. Furthermore, based on the temperature, the heating powers of the heating tube 1 and the heating plate 2 can be independently adjusted, so as to achieve precise control of the temperatures of different regions in the reaction chamber, and improve the uniformity of the metal dust temperature. By setting the graphite inner tube 11, the heat preservation performance is improved. By setting the metal outer tube 13, the explosion resistance performance is enhanced, avoiding leakage or rupture, preventing gas leakage or device damage, and improving the safety of the test.

[0065] Furthermore, the surface of the graphite inner tube 11 has an antioxidant coating. The antioxidant coating can be obtained through antioxidant process treatment to achieve high temperature resistance and oxidation resistance, enabling the graphite material to effectively resist the occurrence of oxidation reaction in a high temperature environment, and significantly extending its service life. The antioxidant treatment not only improves the stability of the graphite inner tube 11, but also ensures the reliability of its heat conduction performance and mechanical strength under extreme conditions, thus providing a guarantee for the performance stability of the test device in long-term and high-frequency experimental applications.

[0066] The cover 3 on the graphite inner tube 11 is made of high temperature resistant material, and can withstand the thermal shock and continuous heating in a high temperature environment, ensuring the stability and long-term use performance of the cover 3 under high temperature test conditions.

[0067] A sealing gasket is provided between the cover 3 and the graphite inner tube 11, and they are detachably connected through a buckle assembly, which can further improve the sealing performance of the reaction chamber. The sealing gasket is made of high temperature resistant and corrosion resistant materials such as silica gel or fluororubber, which can effectively prevent the leakage of hot gas or metal dust during the reaction process, maintain the airtightness of the test environment, and reduce the potential safety hazards during the test. The cover 3 is fixed at the opening of the graphite inner tube 11 through the buckle assembly. The buckle assembly is made of high temperature resistant alloy material and has a firm fixing effect, avoiding the loosening of the cover 3 due to thermal expansion or vibration during the heating process. The buckle assembly is designed to be conveniently opened, facilitating the researchers to quickly open the cover 3 during the later stage of the experiment or when the reactants need to be replaced for operation or observation.

[0068] The design of the cover 3 not only ensures the airtightness and safety during the test process, but also has good operability, facilitating the researchers to adjust the experimental environment or replace the samples during the test. In addition, the cooperation of the sealing gasket and the buckle assembly ensures the sealing effect at high temperature, helps to control the test atmosphere, and avoids the interference of external air on the metal dust reaction.

[0069] The graphite inner tube 11 and the metal outer tube 13 are connected by a clamping member 14 to ensure that they can still maintain a firm and stable connection under high temperature and high pressure environments, thereby enhancing the overall impact resistance of the device and the reliability of long-term use.

[0070] Furthermore, the clamping member 14 can be a mechanical structure with a concave-convex structure processed with high precision, which not only ensures the assembly flexibility of the graphite inner tube 11 but also enhances the protective effect of the metal outer tube 13 on it, preventing loosening or falling off problems caused by inconsistent thermal expansion at high temperatures.

[0071] The heating plate 2 can be made of silicon carbide material. Using the heating plate 2 as a heat source can provide efficient and uniform heating effects. Furthermore, heating cable wires are also arranged at the bottom of the reaction chamber and are controlled separately by the control unit 6.

[0072] Furthermore, the heat insulation layer 12 can be made of ceramic material or superalloy, which plays a role in reducing heat loss. The ceramic material or superalloy has good heat insulation performance, preventing heat from being transferred from the reaction chamber to the metal outer tube 13 and maintaining the stability and explosion resistance of the outer tube.

[0073] The above temperature probe 4 is made of a high-precision high-temperature resistant material, can work stably in a high-temperature environment, and has a fast response time.

[0074] Furthermore, the control unit 6 can include a temperature data acquisition processor 61 and a computer 62. After the temperature data acquisition processor 61 preliminarily processes the data collected by the temperature probe 4, it is sent to the computer 62.

[0075] In an embodiment provided by the present invention, the temperature probe 4 is embedded in the wall of the graphite inner tube 11 through a threaded groove 111. Drilling holes based on the threaded groove 111 is convenient for construction and economical. For example, the temperature probe 4 is embedded every 1 centimeter and the heating wire 112 is bundled.

[0076] Even further, in an embodiment provided by the present invention, the lengths of multiple temperature probes 4 are different, so that the needle heads of the multiple temperature probes 4 are located at different positions from the center to the inner wall of the graphite inner tube 11. That is to say, the temperature probes 4 arranged on each turn of the thread can detect the temperatures at different positions in the radial direction of the graphite inner tube 11. Moreover, since the number of turns of the thread is multiple, along the axial direction of the graphite inner tube 11, the temperature probes 4 can also detect the temperatures at different height positions. Based on this structure, the detection of temperatures in different regions is realized, which is not only beneficial to monitoring the temperature uniformity in the reaction chamber but also beneficial to the subsequent analysis of the process of the metal dust spontaneous combustion when heated by temperature.

[0077] The above-mentioned temperature probes 4 are evenly arranged along the external thread grooves of the graphite inner tube 11. Each probe can independently monitor the temperature changes at different positions, ensuring comprehensive and accurate measurement of the temperature distribution in the entire reaction area.

[0078] Each temperature probe 4 is connected to the control unit 6, and transmits the measured temperature data to the control unit 6 in real time. The control unit 6 adjusts the heating power of the heating wire 112 and the silicon carbide heating plate 2 according to these data to achieve precise temperature control.

[0079] The arrangement of the temperature probes 4 can not only monitor the bottom temperature of the reaction vessel, but also monitor the temperature distribution of the side wall, the upper part and the metal dust accumulation area, thus providing sufficient support for experimental data and helping to analyze the influence of the temperature in different areas on the spontaneous combustion reaction of metal dust. Through multi-point temperature distribution measurement, the temperature gradient in the reaction vessel can be effectively grasped, helping researchers accurately evaluate the spontaneous combustion characteristics of metal dust in different temperature environments.

[0080] In an embodiment provided by the present invention, the control unit 6 includes: a first temperature controller 63 and a second temperature controller 64; the first temperature controller 63 is connected to the heating wire 112 and is used to directly control the heating power of the heating wire 112. The second temperature controller 64 is connected to the heating plate 2 through a transformer 65 and is used to control the heating power of the heating plate 2. The heating wire 112 includes multiple sections of cable wires, and the first temperature controller 63 is used to independently control each section of cable wire. It should be noted that each section of cable wire has an independent temperature control module, and precise temperature regulation is achieved through the control unit 6. For example, precise temperature regulation can be achieved through the PID control algorithm.

[0081] In an embodiment provided by the present invention, a gas sampling port is further provided on the wall of the graphite inner tube 11; a gas sampling assembly is provided on the gas sampling port; the gas sampling assembly is communicatively connected to the control unit 6 and is used to sample the gas generated in the reactor and record and analyze it in order to study the reaction process.

[0082] In an embodiment provided by the present invention, the cover body 3 includes an explosion-proof glass viewing window 31 for observing the test process at high temperatures. The explosion-proof glass viewing window 31 has high temperature resistance and can prevent explosion. The flame changes and experimental progress during the reaction process can be observed in real time through the explosion-proof glass viewing window 31.

[0083] The area occupied by the explosion-proof glass viewing window 31 on the cover body 3 can be set as needed, and this embodiment does not limit it.

[0084] Further, in an embodiment provided by the present invention, the monitoring component 5 includes: a camera 51, which is disposed above the explosion-proof glass viewing window 31. The camera 51 is communicatively connected to the control unit 6. Through the signals transmitted by the camera 51, researchers can monitor the reaction phenomena, flame changes, and other key parameters during the experiment in real time. Further, the camera 51 is a high-speed camera.

[0085] In an embodiment provided by the present invention, the monitoring component 5 includes: a thermal imaging probe 52, which is disposed on the inner wall of the cover 3. Through the thermal imaging probe 52, the reaction phenomena and flame changes during the experiment can be monitored in real time. This design enables researchers to intuitively observe the experimental process, timely adjust the experimental conditions, and record important experimental data. Further, the thermal imaging probe 52 is an infrared thermal imaging probe.

[0086] Through the combined structure of the above-mentioned explosion-proof glass viewing window 31 and the monitoring component 5, researchers can intuitively understand the reaction progress during the experiment, and make timely adjustments and analyses.

[0087] In an embodiment provided by the present invention, the material of the metal outer tube 13 is 316L stainless steel. This material is used to enhance the explosion resistance and high-temperature resistance of the device, and prevent explosion or structural rupture under high-temperature and high-pressure conditions. 316L stainless steel has strong corrosion resistance and oxidation resistance, and can still maintain good mechanical properties in a high-temperature environment, thus ensuring the safety of the device.

[0088] Specifically, 316L stainless steel has excellent high-temperature resistance and corrosion resistance, and is particularly suitable for applications in high-temperature, high-pressure, and corrosive environments. Its chemical composition and metallographic structure enable it to maintain good mechanical strength and structural stability under high-temperature conditions.

[0089] Further, the maximum pressure that the 316L stainless steel outer tube design can withstand is not less than 10 MPa. This enables the device to ensure sufficient safety margin during high-temperature and high-pressure tests, and avoid deformation or rupture caused by excessive external pressure. At the same time, the high ductility and good welding performance of this material make the processing and assembly of the outer tube more convenient, providing a guarantee for the overall manufacturing process of the device.

[0090] In addition, the oxidation resistance and creep resistance of 316L stainless steel at high temperatures further enhance the durability of the device. Combining the precision machining of the stainless steel outer tube and the overall explosion-proof design of the device, this test device can operate stably under extreme experimental conditions, ensuring the reliability of experimental data and the long-term use safety of the device.

[0091] The test device for the spontaneous combustion of metal dust provided by the embodiments of the present invention, through the combined design of the heating tube 1 and the heating plate 2, heats the metal dust from different positions, and detects the temperatures of different regions in the reaction chamber through multiple temperature probes 4. Furthermore, based on the temperature, the heating powers of the heating tube 1 and the heating plate 2 are independently adjusted, enabling precise control of the temperatures of different regions in the reaction chamber and improving the temperature uniformity of the metal dust. By setting the graphite inner tube 11, the heat preservation performance is improved. By setting the metal outer tube 13, the explosion resistance performance is enhanced, preventing leakage or rupture, avoiding gas leakage or device damage, and improving the safety of the test.

[0092] The embodiments of the present invention also provide a test method for the spontaneous combustion of metal dust when heated. Figure 2 The flowchart of a test method for the spontaneous combustion of metal dust when heated provided by the embodiments of the present invention is shown in Figure 2 , and this method includes:

[0093] Fill the metal dust into the reaction chamber formed between the heating tube 1 and the heating plate 2. Open the cover 3 at the top of the graphite inner tube 11, and evenly spread the metal dust to be tested inside the graphite inner tube 11. Cover the cover 3, ensure that the sealing gasket fits well, and fix it with a buckle. Check whether the heating module, temperature probe 4, and control unit 6 are connected properly to complete the preparation work for the test.

[0094] 201. Through the control unit 6, control the heating tube 1 and the heating plate 2 to gradually increase the heating power. The reaction chamber formed between the heating tube 1 and the heating plate 2 is filled with metal dust.

[0095] This step is used to simulate the heating conditions of the metal dust at different temperatures, so as to observe its spontaneous combustion reaction.

[0096] Furthermore, it includes:

[0097] Start the control unit 6 and set the target temperature distribution:

[0098] Independently adjust the powers of the bottom heating plate 2 and the sidewall heating cable to simulate the temperature changes in different regions.

[0099] The temperature probe 4 real-time feeds back the temperature distribution data inside the reaction chamber and displays it on the interface of the control unit 6.

[0100] 202. Obtain the monitoring information sent by the monitoring component 5.

[0101] In this step, use the monitoring component 5 to continuously monitor the environmental changes in the reaction chamber, such as gas concentration, flame shape, etc.

[0102] The monitoring component 5 sends the collected monitoring information to the control unit 6 for subsequent analysis and judgment.

[0103] Further, the monitoring component 5 includes a camera 51 and / or a thermal imaging probe 52.

[0104] Further, through the top observation window, observe the flame change and dynamic process of the spontaneous combustion reaction of metal dust, and record the ignition temperature and reaction phenomena.

[0105] 203. According to the temperature information sent by multiple temperature probes 4, control the heating power of the heating tube 1 and the heating plate 2 respectively.

[0106] Arrange multiple temperature probes 4 in the reaction chamber to accurately measure the temperature changes at different positions. According to the temperature information sent by these temperature probes 4, the control unit 6 can adjust the heating power of the heating tube 1 and the heating plate 2 in real time to ensure the accuracy and controllability of the test conditions. This dynamic adjustment helps to more accurately simulate the spontaneous combustion behavior of metal dust under different temperature gradients. For example, when the temperature at the position near the first end is low, the heating power of the heating plate 2 can be increased to achieve uniform heating of the metal dust and enhance the heating effect.

[0107] 204. According to the monitoring information and temperature information, obtain the influence of different temperatures and environmental conditions on the combustion behavior of metal dust.

[0108] Combine the monitoring information and temperature information to comprehensively analyze the influence of different temperatures and environmental conditions on the combustion behavior of metal dust. This includes observing key indicators such as the spontaneous combustion temperature, combustion rate, and flame propagation characteristics of metal dust, and how these indicators change with temperature and environmental conditions. Through this analysis, the spontaneous combustion mechanism of metal dust can be deeply understood, providing a scientific basis for industrial safety and production.

[0109] Specifically, the control unit 6 automatically collects temperature data and generates a time-temperature distribution curve.

[0110] Record the reaction time, temperature change, and observed flame characteristics.

[0111] After the test is completed, stop heating. After the reaction chamber cools down to a safe temperature, open the lid to clean the residue. Analyze and organize the experimental data.

[0112] The test method for the spontaneous combustion of metal dust when heated provided by the embodiment of the present invention, through the combined design of the heating tube 1 and the heating plate 2, heats the metal dust from different positions, and detects the temperature in different regions of the reaction chamber through multiple temperature probes 4. Furthermore, based on the temperature, independently adjust the heating power of the heating tube 1 and the heating plate 2, which can achieve precise control of the temperature in different regions of the reaction chamber, improve the uniformity of the metal dust temperature. By setting the graphite inner tube 11, the heat preservation performance is improved. By setting the metal outer tube 13, the explosion resistance performance is enhanced, avoiding leakage or rupture, avoiding gas leakage or device damage, and improving the safety of the test.

[0113] The device and method provided by the present invention are used for studying the combustion and pyrolysis characteristics of metal dust, and for simulating the spontaneous combustion behavior of metal dust (such as aluminum powder) under specific thermal conditions. The device integrates multi-point temperature measurement, independent area heating control, high-temperature observation windows, and high-temperature and explosion-resistant designs. It is suitable for studying the spontaneous combustion characteristics, combustion laws, and pyrolysis reaction mechanisms of metal dust under different temperature fields and environments, and can accurately control the temperature distribution, ensure experimental safety, and achieve multi-functional testing. The present invention can be widely applied in the fields of safety engineering, fire science, materials engineering, and environmental engineering, thus providing a reliable experimental basis and data support for industrial production safety assessment and metal dust explosion prevention.

[0114] It should be understood that the term "and / or" in this article is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: the individual existence of A, the simultaneous existence of A and B, and the individual existence of B. Here, A and B can be singular or plural. In addition, the character " / " in this article generally represents an "or" relationship between the preceding and following associated objects, but it may also represent an "and / or" relationship, which can be specifically understood with reference to the context before and after.

[0115] In the present invention, "at least one" means one or more, and "a plurality" means two or more. "At least one of the following" or its similar expressions refer to any combination of these items, including any combination of single item (s) or plural item (s). For example, at least one of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or multiple.

[0116] It should be understood that in various embodiments of the present invention, the magnitudes of the serial numbers of the above processes do not mean the sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0117] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A test device for the spontaneous combustion of metal dust when exposed to heat, characterized in that: The device comprises: A heating tube, the heating tube comprising: a graphite inner tube, a heat-insulating layer and a metal outer tube arranged in sequence from the inside to the outside, wherein a threaded groove is arranged on the outer wall of the graphite inner tube, a heating wire is bundled in the threaded groove, and the graphite inner tube and the metal outer tube are connected by a clamping piece; A heating plate, the heating plate being arranged at the first end of the heating tube to form a reaction chamber with the heating plate; A cover body, the cover body being openably disposed at the second end of the graphite inner tube; A plurality of temperature probes, wherein the plurality of temperature probes are evenly spaced and embedded in the wall of the graphite inner tube, and the needle heads of the temperature probes are located in the reaction chamber; A monitoring component, wherein the monitoring component is arranged on the cover body; A control unit, wherein the control unit is communicatively connected to the heating tube, the heating plate, the plurality of temperature probes, and a monitoring component, wherein the monitoring component is used to send monitoring information to the control unit, and the control unit is also used to control the heating power of the heating tube and the heating plate respectively according to the temperature information sent by the plurality of temperature probes.

2. The test device for the spontaneous combustion of metal dust when exposed to heat according to claim 1 is characterized in that: The temperature probe is embedded in the wall of the graphite inner tube through the thread-shaped groove.

3. The test device for the spontaneous combustion of metal dust when exposed to heat according to claim 2, characterized in that: The lengths of the plurality of temperature probes are different, so that the needle heads of the plurality of temperature probes are located at different positions from the center to the inner wall of the graphite inner tube.

4. The test device for the spontaneous combustion of metal dust when exposed to heat according to claim 1, characterized in that: The control unit comprises: a first thermostat and a second thermostat; The first temperature controller is connected to the heating wire, the heating wire includes multiple sections of cable wire, and the first temperature controller is used to independently control each section of the cable wire; The second temperature controller is connected to the heating plate via a transformer.

5. The testing device for the spontaneous combustion of metal dust when exposed to heat according to claim 1 is characterized in that: The wall of the graphite inner tube is also provided with: a gas collection port, and a gas collection component is provided on the gas collection port; The gas collection component is in communication connection with the control unit.

6. The testing device for the spontaneous combustion of metal dust when exposed to heat according to claim 1, characterized in that: The cover body includes an explosion-proof glass viewing window.

7. The test device for the spontaneous combustion of metal dust when exposed to heat according to claim 6, characterized in that: The monitoring component includes: a camera, and the camera is arranged above the explosion-proof glass visual window.

8. The testing device for the spontaneous combustion of metal dust when exposed to heat according to claim 1, characterized in that: The monitoring component includes: a thermal imaging probe, and the thermal imaging probe is arranged on the inner wall of the cover body.

9. The testing device for the spontaneous combustion of metal dust when exposed to heat according to claim 1, characterized in that: The material of the metal outer tube is 316L stainless steel.

10. A test method for the spontaneous combustion of metal dust when exposed to heat, characterized in that: The method comprises: The control unit controls the heating tube and the heating plate to gradually increase the heating power, and the reaction chamber formed between the heating tube and the heating plate is filled with metal dust; Get the monitoring information sent by the monitoring component; According to the temperature information sent by the multiple temperature probes, the heating power of the heating tube and the heating plate are controlled respectively; Based on the monitoring information and temperature information, the influence of different temperatures and environmental conditions on the combustion behavior of metal dust is obtained.

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