20L spherical explosion device for steam dynamic sample injection and explosion experiment method

Abstract

The invention discloses a 20L spherical explosion device for steam dynamic sample introduction and an explosion experiment method, and relates to the technical field of industrial safety test and explosion protection. The device comprises a test tank body, a steam sample introduction system and a dust sample introduction system; the test tank body is provided with a spherical inner cavity, a first temperature control mechanism is arranged outside the test tank body, an explosion monitoring assembly and an ignition device are arranged inside the test tank body, and the explosion monitoring assembly can monitor pressure, temperature and light intensity changes in the cavity; the steam sample introduction system comprises a steam bin, a second temperature control mechanism and a first gas supply path, and a liquid sample is heated and gasified and then forms premixed gas with first carrier gas; the dust sampling system comprises a dust bin, a third temperature control mechanism and a second gas supply path; the steam bin and the dust bin are each provided with a branch monitoring assembly, and premixed gas, a dust sample and second carrier gas are instantaneously and synchronously sprayed into the spherical inner cavity. The experimental method comprises the following steps: stabilizing the temperature of the tank body, preparing premixed gas, preparing a dust sample and a second carrier gas, synchronously spraying, igniting, testing and collecting parameters. And dynamic sample introduction of sample steam can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial safety testing and explosion protection, and particularly relates to a 20L spherical explosion device with vapor dynamic sampling and an explosion experiment method. BACKGROUND

[0002] In the chemical, energy, pharmaceutical and other industries, it is crucial to accurately assess the explosion risk of combustible dust or combustible vapor. The traditional 20L spherical device relied on by the current industrial dust explosion test standard mainly tests single dust or vapor medium. However, the explosion risk in the actual production environment is mainly caused by gas-powder two-phase mixed system, such as dust carrying solvent vapor or combustible gas containing dust, and the explosion risk is significantly enhanced due to the synergistic effect.

[0003] Moreover, the existing 20L spherical explosion device mainly adopts a static sampling method, in which liquid samples are directly injected into the tank for natural evaporation, and the uniformity is poor. Moreover, the liquid evaporation speed and degree are greatly affected by the liquid droplet morphology, position and micro air flow in the tank, resulting in uncontrollable initial conditions and low repeatability. The real dynamic process of two-phase medium turbulent mixing in the industrial site cannot be accurately simulated, and the test results have poor repeatability and large deviation from the actual working condition. SUMMARY

[0004] The purpose of the present application is to provide a 20L spherical explosion device with vapor dynamic sampling and an explosion experiment method to solve the problems existing in the prior art, realize sample vapor dynamic sampling, synchronously form a uniform and controllable two-phase mixed explosive environment, and provide more complex dangerous system test capability.

[0005] To achieve the above purpose, the present application provides the following solutions. The application provides a 20L spherical explosion device with vapor dynamic sampling, which comprises a test tank body with a spherical inner cavity and a first temperature control mechanism, an explosion monitoring assembly arranged in the spherical inner cavity, wherein the explosion monitoring assembly can monitor at least pressure, temperature and light intensity change in the spherical inner cavity, and an ignition device arranged in the spherical inner cavity, a vapor sampling system comprising a vapor bin, a second temperature control mechanism for providing a heat source in the vapor bin, and a first gas supply path for providing a first carrier gas for the vapor bin, wherein liquid samples added in the vapor bin are completely gasified by the second temperature control mechanism and form a premixed gas together with the first carrier gas, a dust sampling system comprising a dust bin, a third temperature control mechanism for providing a heat source in the dust bin, and a second gas supply path for providing a second carrier gas for the dust bin, wherein the second carrier gas in the second gas supply path entering the dust bin can spray dust samples in the dust bin into the test tank body and form a premixed powder in the test tank body, and branch monitoring assemblies for monitoring pressure and temperature are arranged on the vapor bin and the dust bin, and the premixed gas in the vapor bin and the dust samples and the second carrier gas in the dust bin are sprayed into the spherical inner cavity of the test tank body at the same time.

[0006] Preferably, a liquid sampling device is arranged in the test tank body, which is used for directly injecting liquid samples into the spherical inner cavity, and a third gas supply path for providing compressed gas into the spherical inner cavity is further arranged on the test tank body.

[0007] Preferably, the first gas supply path, the second gas supply path and the third gas supply path are connected with a gas source supply device.

[0008] Preferably, a first diffuser is arranged at an output end of the vapor bin, a second diffuser is arranged at an output end of the dust bin, and the first diffuser and the second diffuser are arranged in the spherical inner cavity, and quick opening and closing control valves are arranged on a communication pipeline between the vapor bin and the spherical inner cavity and on a communication pipeline between the dust bin and the spherical inner cavity.

[0009] Preferably, the first temperature control mechanism, the second temperature control mechanism and the third temperature control mechanism are branches of an oil bath heating device, and a sandwich cavity is arranged in a side wall of the test tank body, the vapor bin and the dust bin, and heat conducting oil provided by the oil bath heating device flows through the sandwich cavity.

[0010] Preferably, a control system is further included, which is in communication connection with the explosion monitoring assembly, the branch monitoring assembly, the control valve, the ignition device, the first temperature control mechanism, the second temperature control mechanism and the third temperature control mechanism.

[0011] Preferably, the test tank body is further provided with a manual pressure relief port, and the spherical inner cavity is connected with a vacuum pump.

[0012] The application further provides an explosion experiment method of a 20L spherical explosion device based on the vapor dynamic sampling of any one of the above, comprising the following steps: S1, temperature adjustment and stabilization of the test tank body at a set temperature by the first temperature control mechanism; S2, quantitative liquid sample is placed in the vapor chamber, heated by the second temperature control mechanism to completely gasify, and mixed with the first carrier gas provided by the first gas supply gas path to form the premixed gas; quantitative dust sample is added to the dust chamber, heated to a set temperature by the third temperature control mechanism, and the second gas supply gas path provides quantitative second carrier gas for the dust chamber; S3, the premixed gas, the dust sample and the second carrier gas are instantaneously and synchronously injected into the spherical inner cavity of the test tank body; S4, set the ignition delay time, start the ignition device for explosion test, and collect explosion characteristic parameters by the explosion monitoring assembly.

[0013] Preferably, after S2 and before S3, the spherical inner cavity of the test tank body is vacuumized to a set pressure value.

[0014] Preferably, S5 is further included, after the explosion characteristic parameters are output, the spherical inner cavity of the test tank body is depressurized, the generated gas in the experiment is discharged, the gas output by the first gas supply gas path and the second gas supply gas path is used to purge the connecting pipeline, and the spherical inner cavity of the test tank body is cleaned.

[0015] The application has the following technical effects compared with the prior art: The 20L spherical explosion device with dynamic vapor sampling provided by this invention integrates independent vapor sampling and dust sampling systems. A second temperature control mechanism within the vapor chamber completely vaporizes the liquid sample and forms a premixed gas with the first carrier gas. The dust chamber contains the dust sample and a second carrier gas. The premixed gas, dust sample, and second carrier gas are then instantaneously and synchronously injected into the spherical cavity of the test vessel, achieving precise control over the concentration and injection timing of the gas and dust phases. This synchronously forms a uniform and controllable two-phase mixed explosive environment, accurately replicating the real-world scenario of two-phase media coexisting in industrial settings, and effectively meeting the needs of explosion hazard assessment under synergistic effects. Addressing the problems of poor mixing uniformity, uncontrollable initial conditions, and low repeatability of traditional static sampling methods, this device adopts a dynamic sampling mode. The sample is vaporized in an independent vapor chamber, where the temperature and pressure are precisely controlled by a second temperature control mechanism and a branch monitoring component to ensure complete vaporization and stable concentration. The dust sample is temperature-controlled in a dust chamber by a third temperature control mechanism and is propelled into the test tank by a second carrier gas to form a uniform premixed powder. Both are injected into the tank in an instantaneous synchronous injection manner to reduce the problem of uneven mixing caused by natural diffusion. At the same time, the first temperature control mechanism on the outside of the test tank and the explosion monitoring component in the inner cavity can ensure the stability of the experimental environment and the accurate acquisition of parameters, significantly improving the controllability of the initial experimental conditions and the repeatability of the test results, and greatly reducing the deviation from the actual working conditions. Moreover, the synchronous injection of both can shorten the preparation time of the experiment and reduce the slow process of waiting for the liquid to completely evaporate into vapor and diffuse evenly in the traditional static injection method.

[0016] This invention also provides an explosion test method. A first temperature control mechanism stabilizes the test container at a set temperature. A second temperature control mechanism and a first gas supply path allow the liquid sample to be completely vaporized in the vapor chamber to form a uniform premixed gas. A third temperature control mechanism and a second gas supply path allow the dust sample to form a stable premixed powder in the test container. The two-phase system is uniformly mixed through instantaneous synchronous injection. With the setting of ignition delay time and the precise acquisition of parameters by the explosion monitoring component, the controllability and mixing uniformity of the experimental conditions are effectively improved, the repeatability and accuracy of the test results are significantly optimized, and the method is precisely adapted to the explosion characteristic testing requirements of vapor and dust two-phase systems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of the 20L spherical explosion device for dynamic vapor injection provided by the present invention.

[0019] In the picture: 1-Test vessel; 101-Lid; 102-Injection needle; 103-Manual three-way valve; 104-Ignition device; 105-Interlayer cavity; 106-Manual pressure relief port; 107-Vacuum pump; 108-Explosion monitoring component; 2-Steam chamber; 201-Branch monitoring assembly; 202-First diffuser; 203-Control valve; 3-Dust bin; 301-Second diffuser; 4-Gas supply equipment; 401-First gas supply line; 402-Second gas supply line; 403-Third gas supply line; 5-Control System. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a 20L spherical explosion device and explosion test method for dynamic vapor injection, so as to solve the problems existing in the prior art, realize dynamic vapor injection of samples, and simultaneously form a uniform and controllable two-phase mixed explosive environment, providing a more complex and dangerous system testing capability.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 This embodiment provides a 20L spherical explosion device for dynamic vapor injection, such as... Figure 1As shown, it includes: a test tank 1 with a spherical inner cavity and an external first temperature control mechanism; an explosion monitoring component 108 is installed inside the spherical inner cavity, which can at least monitor the pressure, temperature, and light intensity changes inside the spherical inner cavity (the explosion monitoring component 108 includes a pressure sensor, a temperature sensor, and a light intensity sensor), and an ignition device 104 is installed inside the spherical inner cavity; a vapor injection system including a vapor chamber 2, a second temperature control mechanism that provides a heat source to the vapor chamber 2, and a first gas supply path 401 that provides a first carrier gas to the vapor chamber 2; the liquid sample added to the vapor chamber 2 is completely vaporized by the second temperature control mechanism and forms a premixed gas together with the first carrier gas; and a dust injection system including a dust chamber 3, a third temperature control mechanism that provides a heat source to the dust chamber 3, and a second gas supply path 401 that provides a second carrier gas to the dust chamber 3. 2; The second carrier gas introduced into the dust chamber 3 through the second air supply path can spray the dust sample in the dust chamber 3 into the test tank 1, and form a premixed powder in the test tank 1; Both the steam chamber 2 and the dust chamber 3 are equipped with branch monitoring components 201 for monitoring pressure and temperature (including pressure sensors and temperature sensors for monitoring the steam chamber 2 and the dust chamber 3; wherein, the pressure sensor can be set in the steam chamber 2 and the dust chamber 3; or it can be set in a pipeline that is always connected to the steam chamber 2 and the dust chamber 3, and the first air supply path 401 and the second air supply path 402 can also be equipped with necessary pressure gauges according to actual needs); The premixed gas in the steam chamber 2 and the dust sample and the second carrier gas in the dust chamber 3 are instantaneously and synchronously sprayed into the spherical inner cavity of the test tank 1 (the premixed gas and the premixed powder together form a steam-dust mixed cloud).

[0024] The device integrates independent vapor and dust sampling systems. The liquid sample is completely vaporized by a second temperature control mechanism within the vapor chamber 2 and mixed with the first carrier gas to form a premixed gas. The dust chamber 3 contains the dust sample and a second carrier gas. The premixed gas, dust sample, and second carrier gas are then instantaneously and synchronously injected into the spherical inner cavity of the test tank 1. This achieves precise control over the concentration and injection timing of the gas and dust phases, thereby simultaneously forming a uniform and controllable two-phase mixed explosive environment. This accurately replicates the real-world scenario of two-phase media coexisting in industrial settings and effectively meets the needs of explosion hazard assessment under synergistic effects. Addressing the problems of poor mixing uniformity, uncontrollable initial conditions, and low repeatability of traditional static sampling methods, this device adopts a dynamic sampling mode. The liquid sample is injected into a vacuum chamber 3... The vapor chamber 2 achieves precise temperature and pressure control during the vaporization process through a second temperature control mechanism and a branch monitoring component 201, ensuring complete vaporization and stable concentration. The dust sample is temperature-controlled in the dust chamber 3 by a third temperature control mechanism and is propelled into the test tank 1 by a second carrier gas to form a uniform premixed powder. The two are injected into the tank in an instantaneous synchronous injection manner, reducing the problem of uneven mixing caused by natural diffusion. At the same time, the first temperature control mechanism on the outside of the test tank 1 and the explosion monitoring component 108 in the inner cavity can ensure the stability of the experimental environment and the accurate acquisition of parameters, significantly improving the controllability of the initial experimental conditions and the repeatability of the test results, and greatly reducing the deviation from the actual working conditions. Moreover, the synchronous injection of the two can shorten the preparation time of the experiment and reduce the slow process of waiting for the liquid to completely evaporate into vapor and diffuse evenly in the traditional static injection method.

[0025] The following are the relevant settings instructions for test tank 1: Specifically, test tank 1 is a 20L spherical explosive tank.

[0026] Specifically, the test tank 1 is also equipped with a necessary insulation sleeve to avoid the cold wall effect.

[0027] Specifically, the temperature sensor, pressure sensor, and light intensity sensor on the test tank 1 are all located on the outside of the test tank 1, and the detection sensing elements of each sensor extend into the inside of the test tank 1 through small holes on the test tank 1.

[0028] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the test tank 1 is equipped with a liquid injector, which is used to directly inject liquid samples into the spherical inner cavity; the test tank 1 is also equipped with a third gas supply line 403 for supplying compressed gas to the spherical inner cavity.

[0029] Specifically, the liquid sampler, in conjunction with the third gas supply path 403, can also be used for related explosion experiments under vapor conditions alone.

[0030] Specifically, the liquid sampler is a sample injection needle 102, which is equipped with a manual three-way valve 103 to control the inflow of liquid sample.

[0031] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the test tank 1 is also equipped with a manual pressure relief port 106, and a vacuum pump 107 is connected to the spherical inner cavity.

[0032] Specifically, the vacuum pump 107 is used to evacuate the test tank 1 to create a negative pressure environment; the manual pressure relief port 106 is equipped with a manual pressure relief valve, which is used to make the pressure inside the test tank 1 the same as the outside pressure after the explosion experiment.

[0033] Specifically, the test tank 1 has a cover 101, and the liquid injector and ignition device 104 are fixed on the cover 101.

[0034] The following are the setup instructions for the vapor injection system and the dust injection system: Specifically, the steam chamber 2 is made of stainless steel and has a pressure resistance of not less than 4MPa.

[0035] Specifically, the branch monitoring component 201 includes a pressure sensor and a temperature sensor, wherein the pressure sensor has a measurement range of 0~2.5MPa.

[0036] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the output end of the steam chamber 2 is provided with a first diffuser 202, and the output end of the dust chamber 3 is provided with a second diffuser 301. Both the first diffuser 202 and the second diffuser 301 are located inside the spherical inner cavity. The connecting pipes between the steam chamber 2 and the spherical inner cavity, and the connecting pipes between the dust chamber 3 and the spherical inner cavity are provided with control valves 203 that can be opened and closed quickly.

[0037] Specifically, the first diffuser 202 is fixedly disposed at the bottom of the spherical inner cavity, and the second diffuser 301 is fixedly disposed on the side wall of the spherical inner cavity; the first diffuser 202 and the second diffuser 301 are used to enable the injected premixed gas, dust sample and second carrier gas to diffuse rapidly and uniformly into the entire internal space of the test tank 1, so as to achieve a high dispersion distribution and promote the rapid and uniform mixing of vapor, dust and air.

[0038] Specifically, inside the dust chamber 3, the second carrier gas is located above the dust sample. The dust chamber 3 has a conical constricted outlet. The dust sample is located at the conical constricted outlet of the dust chamber 3. When the passage is opened, the second carrier gas pushes the dust sample out from the conical constricted outlet of the dust chamber 3, and sprays the dust sample out through the second diffuser 301, forming premixed powder in the test tank 1.

[0039] Specifically, both the first diffuser 202 and the second diffuser 301 can be freely disassembled, and the diffuser style can be replaced according to actual needs. If the diffuser is not needed, the interface of the output end of the dust chamber 3 and the interface of the output end of the vapor chamber 2 can be sealed with a plug equipped with a sealing gasket.

[0040] The following are the settings instructions for control system 5: Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, it also includes a control system 5, which is communicatively connected to the explosion monitoring component 108, the branch monitoring component 201, the control valve 203, the ignition device 104, the first temperature control mechanism, the second temperature control mechanism and the third temperature control mechanism.

[0041] Specifically, the control system 5 can automatically adjust the corresponding components. For example, it can automatically control the temperature and gas injection according to the set target value through temperature control (such as heating by the first temperature control mechanism, the second temperature control mechanism and the third temperature control mechanism) and air intake (first air supply line 401, second air supply line 402 and third air supply line 403), so that the temperature and pressure in the steam chamber 2, dust chamber 3 and test tank 1 are stabilized within the preset range.

[0042] Specifically, control system 5 can remotely monitor and adjust parameters throughout the entire experimental process, and transmit experimental data via network.

[0043] The following are the settings instructions for gas supply equipment 4: Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the first gas supply path 401, the second gas supply path 402, and the third gas supply path 403 are all connected to the gas supply device 4 (the gas supply device 4 has its own independent gas supply drive unit and gas storage unit. The amount of gas stored in each gas storage unit is determined according to the experimental requirements. The gas supply drive unit is used to discharge the gas in the gas storage unit accordingly. The first gas supply path 401 is connected to a set of gas supply drive unit and gas storage unit. The second gas supply path 402 is connected to a set of gas supply drive unit and gas storage unit. The third gas supply path 403 is connected to a set of gas supply drive unit and gas storage unit).

[0044] Including instructions regarding temperature control settings: Specifically, the first temperature control mechanism, the second temperature control mechanism, and the third temperature control mechanism can be supplied independently, or they can be supplied with the same heating medium by the same oil bath heating device; and in addition to being an oil bath heating device, they can also be electric heating devices.

[0045] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1As shown, the first, second, and third temperature control mechanisms are all branches of the oil bath heating device (except that the heating medium is provided by the oil bath heating device, and the heating control of the test tank 1, steam chamber 2, and dust chamber 3 is independent of each other, that is, the temperature, pressure, and time of the liquid sample in the steam chamber 2 and the dust sample in the separation chamber are controlled independently of the state of the test tank 1, so as to realize the independent heating and temperature control function of each part); the side walls of the test tank 1, steam chamber 2, and dust chamber 3 are all provided with a double-layer cavity 105, and the double-layer cavity 105 is filled with heat transfer oil provided by the oil bath heating device (the heating and constant temperature range can be specified as room temperature to 150℃, so as to realize the uniform and precise control of the temperature in the system).

[0046] Example 2 This embodiment provides an explosion test method for a 20L spherical explosion device with dynamic vapor injection based on Embodiment 1, including the following steps: S1, the temperature of the test tank 1 is adjusted and stabilized at the set temperature by the first temperature control mechanism (the test tank 1 and its connecting pipelines are checked to ensure that they meet the experimental requirements, and necessary valves, such as manual pressure relief valve, control valve 203, etc., are closed). S2, a quantitative liquid sample is placed in the vapor chamber 2 and heated to complete vaporization by the second temperature control mechanism, and mixed with the first carrier gas provided by the first gas supply line 401 to form a premixed gas (i.e., pressurizing the vapor chamber 2 to a set value through the first gas supply line 401); a quantitative dust sample is added to the dust chamber 3 and heated to a set temperature by the third temperature control mechanism, and a quantitative second carrier gas is provided to the dust chamber 3 by the second gas supply line 402 (i.e., pressurizing the dust chamber 3 to a set value through the second gas supply line 402). S3, the premixed gas, dust sample and second carrier gas are instantaneously and synchronously injected into the spherical inner cavity of the test tank 1 (the premixed gas, dust sample and second carrier gas are synchronously injected into the test tank 1 by opening two corresponding control valves 203). S4, set the ignition delay time, start the ignition device 104 to conduct an explosion test, and collect explosion characteristic parameters through the explosion monitoring component 108.

[0047] The first temperature control mechanism stabilizes the test tank 1 at the set temperature. The second temperature control mechanism and the first gas supply path 401 allow the liquid sample to be completely vaporized in the vapor chamber 2 to form a uniform premixed gas. The third temperature control mechanism and the second gas supply path 402 enable the dust sample test tank to form a stable premixed powder. The two-phase system is uniformly mixed through instantaneous synchronous injection. With the set ignition delay time and the explosion monitoring component 108 accurately collecting parameters, the controllability and mixing uniformity of the experimental conditions are effectively improved, the repeatability and accuracy of the test results are significantly optimized, and the explosion characteristics test requirements of the vapor and dust two-phase system are accurately met.

[0048] Specifically, before S1, the experimental conditions need to be determined, including the target vapor concentration, dust concentration (based on the target vapor concentration and dust concentration, determine the amount of liquid sample added in vapor chamber 2 and the amount of dust sample added in dust chamber 3) and experimental temperature, etc. (also including the set series of minimum ignition energy values ​​corresponding to the minimum ignition energy experiment).

[0049] In the optional schemes of this embodiment, it is more preferred that, after S2 and before S3, the spherical inner cavity of the test tank 1 is evacuated to a set pressure value.

[0050] Specifically, after S2 and before S3, since the pressure inside the test tank 1, which has been injected with premixed gas, dust sample and second carrier gas, must be at atmospheric pressure before the explosion experiment is ignited, it is necessary to calculate the vacuum value of the test tank 1 before the sample is injected based on the volume of the vapor chamber 2 and the dust chamber 3 and their respective pressure values.

[0051] Specifically, in S4, the ignition method is selected according to experimental requirements. If chemical ignition is selected, the chemical ignition head is fixed to the ignition electrode; if electric spark ignition is used, the tungsten electrode is fixed to the ignition electrode (ignition device 104 includes a chemical ignition head and an ignition electrode, or a tungsten electrode and an ignition electrode). After sample injection is completed and ignition device 104 is prepared, the test container 1 is evacuated; and using a discharge ignition system with precisely adjustable energy, the minimum ignition energy of the vapor-dust two-phase mixture at a specific concentration is determined according to the "dichotomy method" or similar statistical methods.

[0052] Specifically, in S4, the pressure sensor, temperature sensor, and light intensity sensor inside the test tank 1 monitor the changes in pressure, temperature, and light intensity inside the test tank 1 in real time and transmit the data to the control system 5 to generate a result file (the control system 5 can complete the acquisition and analysis of explosion characteristic parameter data, and automatically record and calculate, and finally automatically generate the result curve).

[0053] In the optional scheme of this embodiment, a more preferred method is to further include S5, after the explosion characteristic parameters are output, depressurize the spherical inner cavity of the test tank 1 and discharge the gas generated in the experiment, and use the gas output from the first gas supply line 401 and the second gas supply line 402 to purge the connecting pipeline (also including the third gas supply line 403, through the high-pressure gas provided by the first gas supply line 401, the second gas supply line 402 and the third gas supply line 403, the residual dust and gas in the pipeline are flushed into the test tank 1), and clean the spherical inner cavity of the test tank 1 (the test tank 1 has a cover 101, after opening the cover 101, a vacuum cleaner and a brush are used to clean the inside of the test tank 1 and its components, after cleaning, the cover 101 is closed to prepare for the next experiment).

[0054] Specifically, regarding the principle for determining the lower explosive limit, if combustion and explosion occur, the concentration is reduced and the next experiment is conducted; if combustion and explosion do not occur, the concentration is increased and the next experiment is conducted. Through at least three repeated experiments, the lower explosive limit concentration of the vapor-dust two-phase mixture system is finally determined.

[0055] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A vapor dynamic sample introduction 20 L sphere bomb, characterized in that: The test tank body has a spherical inner cavity and is provided with a first temperature control mechanism outside; The spherical inner cavity is provided with an explosion monitoring assembly, which can at least monitor the pressure, temperature and light intensity change in the spherical inner cavity, and the spherical inner cavity is provided with an ignition device; The vapor sampling system includes a vapor tank, a second temperature control mechanism for providing a heat source in the vapor tank, and a first gas supply path for providing a first carrier gas to the vapor tank; the liquid sample added in the vapor tank is completely gasified by the second temperature control mechanism, and forms a premixed gas with the first carrier gas; The dust sampling system includes a dust tank, a third temperature control mechanism for providing a heat source in the dust tank, and a second gas supply path for providing a second carrier gas to the dust tank; the second carrier gas in the second gas supply path can inject the dust sample in the dust tank into the test tank body and form a premixed powder in the test tank body; The vapor tank and the dust tank are both provided with branch monitoring assemblies for monitoring pressure and temperature; The premixed gas in the vapor tank and the dust sample and the second carrier gas in the dust tank are instantaneously and synchronously injected into the spherical inner cavity of the test tank body. The test tank body is provided with a liquid sample injector for directly injecting a liquid sample into the spherical inner cavity; 2. The vapor dynamic spiking 20 L spherical bomb of claim 1, wherein: The test tank body is also provided with a third gas supply path for providing compressed gas to the spherical inner cavity. The first gas supply path, the second gas supply path and the third gas supply path are all connected with a gas source supply device.

3. The vapor dynamic spiking 20 L spherical bomb of claim 1, wherein: The output end of the vapor tank is provided with a first diffuser, and the output end of the dust tank is provided with a second diffuser, both of which are arranged in the spherical inner cavity; 4. The vapor dynamic spiking 20 L spherical bomb of claim 1, wherein: The communication pipeline between the vapor tank and the spherical inner cavity, and the communication pipeline between the dust tank and the spherical inner cavity are both provided with a quick opening and closing control valve. The first temperature control mechanism, the second temperature control mechanism and the third temperature control mechanism are all branches of an oil bath heating device; 5. The vapor dynamic spiking 20 L spherical bomb of claim 1, wherein: The side walls of the test tank body, the vapor tank and the dust tank are all provided with a sandwich cavity, and the sandwich cavity is filled with heat conducting oil provided by the oil bath heating device. It also includes a control system, which is in communication connection with the explosion monitoring assembly, the branch monitoring assembly, the control valve, the ignition device, the first temperature control mechanism, the second temperature control mechanism and the third temperature control mechanism.

6. The vapor dynamic spiking 20L spherical bomb of claim 4, wherein: The test tank body is also provided with a manual pressure relief port, and the spherical inner cavity is connected with a vacuum pump.

7. The vapor dynamic spiking 20 L spherical bomb of claim 1, wherein: The following steps are included:

8. A method for explosion experiment of a 20L spherical explosion device based on the vapor dynamic sampling of any one of claims 1-7, characterized in that: S1, adjust the temperature of the test tank body to a set temperature by the first temperature control mechanism; S2, place a certain amount of liquid sample in the vapor tank, heat it to complete gasification by the second temperature control mechanism, and mix it with the first carrier gas provided by the first gas supply path to form the premixed gas; add a certain amount of dust sample to the dust tank, heat it to a set temperature by the third temperature control mechanism, and the second gas supply path provides a certain amount of second carrier gas to the dust tank; ​ S3, instantaneously synchronously injecting the premixed gas, the dust sample and the second carrier gas into the spherical inner cavity of the test tank; S4, setting a firing delay time, starting the firing device to perform an explosion test, and collecting explosion characteristic parameters through the explosion monitoring assembly.

9. The explosion experiment method according to claim 8, characterized by: After S2 and before S3, the spherical inner cavity of the test tank is vacuumized to a set pressure value.

10. The explosion experiment method according to claim 8, characterized by: S5, after the explosion characteristic parameters are output, the spherical inner cavity of the test tank is depressurized, and the generated gas is discharged. The gas output by the first gas supply path and the second gas supply path is used to purge the connecting pipeline, and the spherical inner cavity of the test tank is cleaned.

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