CN110389152B - Dust explosion simulation testing device and operation method thereof - Google Patents
Dust explosion simulation testing device and operation method thereof Download PDFInfo
- Publication number
- CN110389152B CN110389152B CN201910687644.5A CN201910687644A CN110389152B CN 110389152 B CN110389152 B CN 110389152B CN 201910687644 A CN201910687644 A CN 201910687644A CN 110389152 B CN110389152 B CN 110389152B
- Authority
- CN
- China
- Prior art keywords
- pipe section
- explosion
- pressure sensor
- section
- simulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000428 dust Substances 0.000 title claims abstract description 105
- 238000004088 simulation Methods 0.000 title claims abstract description 96
- 238000004880 explosion Methods 0.000 title claims abstract description 51
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims description 22
- 239000000843 powder Substances 0.000 claims abstract description 106
- 238000005474 detonation Methods 0.000 claims abstract description 42
- 238000004891 communication Methods 0.000 claims abstract description 40
- 238000012545 processing Methods 0.000 claims abstract description 24
- 230000000977 initiatory effect Effects 0.000 claims description 34
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 28
- 230000037452 priming Effects 0.000 claims description 15
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 14
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 238000005219 brazing Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000011017 operating method Methods 0.000 claims 2
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000011835 investigation Methods 0.000 abstract description 3
- 238000012795 verification Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 20
- 230000006872 improvement Effects 0.000 description 16
- 230000008569 process Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/50—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility
- G01N25/54—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility by determining explosibility
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a dust explosion simulation testing device, which comprises a mechanical structure part and an electric control acquisition part, wherein the mechanical structure part comprises a mechanical structure part and a dust explosion simulation testing device; the mechanical structure part comprises an inlet explosion-proof pipe section, a detonation pipe section, a simulation pipe section and an outlet explosion-proof pipe section which are sequentially connected; the detonating tube section is provided with a powder supply tank, and the simulating tube section is provided with a powder adding port; the electric control acquisition part comprises a communication module, an igniter, a pressure sensor A, a pressure sensor B, a pressure sensor C and a data processing server, wherein the igniter, the pressure sensor A, the pressure sensor B, the pressure sensor C and the data processing server are respectively connected with the communication module. The detonation pipe section is respectively connected with the igniter and the pressure sensor A, the simulation pipe section is connected with the pressure sensor B, the outlet explosion-proof pipe section is connected with the pressure sensor C, and the powder supply tank is connected with the communication module. The invention realizes the high-speed on-line monitoring and acquisition of the multi-working-condition multi-mechanism broad-spectrum dust explosion characteristics and the aims of accident reproduction, hidden danger investigation and extreme value verification through the motion similarity principle of hydrodynamics and corresponding arrangement and operation.
Description
Technical Field
The invention relates to the technical field of powder industry overpressure explosion protection, in particular to a dust explosion simulation testing device of a powder explosion energy real-time monitoring and calibrating device capable of simulating actual working conditions and an operation method thereof.
Background
The powder industry, which uses powder as the main operation medium, has a wide range of process materials and products with high flow rate, high oxygen content and high stack pressure properties. Powder industry plants are normally operated under pressure and use pressure vessels or air compression machinery to store or transport the relevant process materials. Once the equipment is subjected to fluctuation of the external environment or errors of manual operation, the related equipment is easy to have potential safety hazards of static electricity or over-temperature, and severe explosion can be caused seriously. In order to ensure the safety of the production process and the controllability in an unexpected situation, an overpressure relief or an active spraying device is generally adopted in industry as a protection technical means. However, in the dust industry, the powder body has too many influence factors for explosion, and particularly, the flow rate of the corresponding gas-solid two-phase flow and the differential pressure power in the transportation process are difficult to simulate, so that the actual harm degree cannot be determined after explosion occurs. Therefore, the assessment standard of the safety equipment is mostly derived according to experience and theoretical values, related tests are only carried out by adopting the explosion-proof tank body without initial flow velocity and pressure difference, and the assessment standard in industry is difficult to unify. After the occurrence of the accident, there is no corresponding technical means to reproduce the intrinsic mechanism of dust explosion.
Chinese researchers put forward some test methods under ideal conditions on the basis of relevant research, but the flow rate and pressure of powder equipment under actual working conditions can be simulated at present, and patents of the test device and the method for realizing online acquisition and recording are almost in a blank state. Patents that may be currently associated with this field are:
a dust explosion parameter test device (patent number: CN201620163426.3) discloses a test device which uses a pressure-resistant tank body to collect dust explosion characteristic parameters under ideal conditions of no flow velocity and no pressure difference. A combined type industrial dust explosion simulation demonstration system (patent number: CN201710182029.X) discloses a combined type dust explosion demonstration system using a programmable logic controller as an acquisition system. A dust explosion flame propagation behavior observation experiment system (patent number: CN201710205389.7) discloses a small dust explosion observation system using a fan to raise dust. However, the acquisition system architecture of the system disclosed in the above patent is a commercial module with a common acquisition frequency, and for a negative pressure type dust removal or powder supply system commonly used in the modern industry, the comparison and simulation effect on hydromechanics is lacking.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a dust explosion simulation testing device of a powder explosion energy real-time monitoring and calibrating device capable of simulating actual working conditions and an operation method thereof.
In order to solve the technical problem, the dust explosion simulation testing device provided by the invention comprises a mechanical structure part and an electric control acquisition part.
The mechanical structure part comprises an inlet explosion-proof pipe section, a detonation pipe section, a simulation pipe section and an outlet explosion-proof pipe section which are sequentially connected, and the sequential connection sequence is also the airflow flow direction sequence inside the pipe sections. The detonating tube section is provided with a powder supply tank, and the simulating tube section is provided with a powder adding port.
The electric control acquisition part comprises a communication module, an igniter, a pressure sensor A, a pressure sensor B, a pressure sensor C and a data processing server, wherein the igniter, the pressure sensor A, the pressure sensor B, the pressure sensor C and the data processing server are respectively connected with the communication module.
The detonation pipe section is respectively connected with the igniter and the pressure sensor A, the simulation pipe section is connected with the pressure sensor B, the outlet explosion-proof pipe section is connected with the pressure sensor C, and the powder supply tank is connected with the communication module.
As an improvement, the mechanical structure part also comprises an air pipe, a dust removal collector and a centrifugal dust removal fan which are connected in sequence; the air pipe is connected with the outlet explosion-proof pipe section.
As an improvement, the dust collector adopts a cloth bag dust collector, and a filter screen is arranged at the air inlet of the centrifugal dust removal fan.
As an improvement, the pressure sensor A, the pressure sensor B and the pressure sensor C all adopt high-frequency dynamic pressure sensors.
As an improvement, a transparent observation pipe section is arranged between the simulation pipe section and the outlet flame-proof pipe section.
As an improvement, a passive plate type explosion-proof valve is respectively arranged at an airflow inlet of the inlet explosion-proof pipe section and an airflow outlet of the outlet explosion-proof pipe section.
As an improvement, the outer wall of the initiation pipe section is provided with an opening and an external connecting pipe; the outlet of the powder supply tank is provided with a quick-opening electromagnetic valve which is connected with an external connecting pipe.
As an improvement, the priming pipe section is a rectangular pipe or a circular pipe; in the airflow direction, in order to prevent the settling velocity of large particle dust from being too high, the ignition position is far away from the central part of the dust cloud, the ratio of the length of the external connecting pipe of the initiation pipe section from the airflow inlet of the initiation pipe section to the inner diameter of the cross section of the circular initiation pipe section or the minimum side length of the cross section of the rectangular initiation pipe section is not less than 2:1, and the ratio of the length of the external connecting pipe of the initiation pipe section from the airflow outlet of the initiation pipe section to the inner diameter of the cross section of the circular initiation pipe section or the minimum side length of the cross section of the rectangular initiation pipe section is.
As an improvement, the ignition end of the igniter is arranged on the inner wall of the detonation tube section, in the airflow flowing direction, the ratio of the distance of the ignition end of the igniter relative to an external connecting tube of the detonation tube section to the inner diameter of the section of the circular detonation tube section or the minimum side length of the section of the rectangular detonation tube section is not more than 1:1, and the ignition end is ensured to be close to the center of the dust cloud as far as possible.
As a refinement, the opening at the firing tip of the igniter is either threaded or brazed.
As an improvement, the power supply part of the igniter adopts an intrinsic safety explosion-proof type.
As an improvement, to prevent adverse consequences of ignition failure and to take into account the need for ignition energy during the dust cloud diffusion process, the ignition energy of the igniter is not less than twice the theoretical minimum ignition energy of the dust.
As an improvement, a pressure sensor A is connected to the side wall of the detonation tube section, and an acquisition element of the pressure sensor A is flush with the inner wall of the detonation tube section; the pressure sensor B is connected to the side wall of the simulation pipe section, and an acquisition element of the pressure sensor B is flush with the inner wall of the simulation pipe section; the pressure sensor C is connected to the side wall of the outlet explosion-proof pipe section, and an acquisition element of the pressure sensor C is flush with the inner wall of the outlet explosion-proof pipe section.
As an improvement, the simulation pipe section adopts a rectangular pipe, and the tensile strength sigma of the pipe body material of the rectangular pipeminWall thickness of rectangular tube, maximum side length L of cross section of rectangular tuberThe following condition is satisfied:
wherein: pmaxThe theoretical maximum explosion pressure of the selected dust is in MPa.
As an improvement, the simulation pipe section adopts a circular pipe,tensile strength sigma of pipe body materialminWall thickness of circular tube and outer diameter D of circular tuberThe following conditions are satisfied:
wherein: pmaxThe theoretical maximum explosion pressure of the selected dust is in MPa.
As an improvement, the number of the powder adding openings is more than or equal to 1, in order to ensure that the openings on the pipe section do not need to be reinforced, the maximum value of the size of the openings of the powder adding openings is not more than 1/3 of the outer diameter of the section of the circular simulation pipe section or the minimum side length of the section of the rectangular simulation pipe section, and the ratio of the distance between two adjacent powder adding openings to the inner diameter of the section of the circular simulation pipe section or the minimum side length of the section of the rectangular simulation pipe section is not less than 1: 1.
As an improvement, the communication module is connected with the data processing server by a twisted pair, the communication module is respectively connected with the powder supply tank by a shielding wire, and the communication module is connected with the igniter by a copper core wire.
The assembling method and the checking method of the dust explosion simulation testing device comprise the following steps of:
1. connecting a passive plate type explosion-proof valve to an airflow inlet of an inlet explosion-proof pipe section by using a bolt, wherein the explosion-proof direction of the passive plate type explosion-proof valve is towards an airflow outlet of the inlet explosion-proof pipe section; the total length of the inlet explosion-proof pipe section is larger than the minimum safety distance of the installed passive plate type explosion-proof valve.
2. An airflow outlet of the inlet explosion-proof pipe section is connected to an airflow inlet of the detonation pipe section by using a flange, and an outer connecting pipe is arranged at a position, along the airflow direction, where the ratio of the length of the airflow inlet away from the detonation pipe section to the inner diameter of the section of the circular detonation pipe section or the minimum side length of the section of the rectangular detonation pipe section is not less than 2: 1; the ratio of the distance from the airflow outlet of the initiation pipe section to the external connecting pipe of the initiation pipe section to the inner diameter of the section of the circular initiation pipe section or the minimum side length of the section of the rectangular initiation pipe section is not more than 3: 1. The external pipe is connected with a quick-opening electromagnetic valve of a powder outlet of the powder supply tank.
3. In the airflow flowing direction of the priming pipe section, the position, where the ratio of the distance of the external connecting pipe to the inner diameter of the section of the circular priming pipe section or the minimum side length of the section of the rectangular priming pipe section is not more than 1:1, is provided with an opening for arranging the ignition end of the igniter. The power bolt terminal of some firearm sets up at the detonation tube section outer wall, uses the copper core line to be connected with communication module's on-off volume export to ensure that the power supply unit of some firearm is this safe explosion-proof type, the trompil of the ignition end department of some firearm should use pipe thread or braze and ensure not to take place to leak under the high pressure environment.
4. The pressure sensor A is connected to the side wall of the detonation tube section through threads, and the specific position can be selected automatically between the ignition end of the igniter and the gas outlet of the detonation tube section according to requirements and sensor tolerance. The pick-up element of the pressure sensor a should be flush with the inner wall of the detonation tube segment.
5. The gas outlet of the priming pipe section is connected with the gas flow inlet of the simulation pipe section by a flange. The simulation pipe section can be customized according to the specific numerical values of the parameters such as the pipeline form, the dust concentration and the dust type to be tested.
6. The powder adding ports are formed in the outer wall of the simulation pipe section in a hole mode and are welded, the number of the powder adding ports can be more than one, and the ratio of the distance between every two adjacent powder adding ports to the inner diameter of the section of the circular simulation pipe section or the minimum side length of the section of the rectangular simulation pipe section is not less than 1: 1; the maximum value of the opening size of the powder adding opening cannot exceed 1/3 of the inner diameter of the section of the circular simulated tube section or the minimum side length of the section of the rectangular simulated tube section; the powder inlet of the powder adding port is provided with an edge skirt, and is provided with a flange cover of a corresponding type, so that the flange cover is strictly sealed during the experiment.
7. The pressure sensor B is connected to the side wall of the simulation pipe section through threads, and the specific position can be automatically selected between a gas inlet and a gas outlet of the simulation pipe section according to the requirement and the tolerance capability of the sensor; the pick-up element of the pressure sensor B should be flush with the inner wall of the simulated pipe section.
8. And the airflow inlet of the transparent observation pipe section is connected with the airflow outlet of the dust environment simulation pipe section through a flange. The airflow outlet of the transparent observation pipe section is connected with the airflow inlet of the outlet flame-proof pipe section through a flange.
9. An airflow outlet of the outlet explosion-proof pipe section is provided with a passive plate type explosion-proof valve by using a bolt, and the outlet of the explosion-proof valve is connected with an airflow inlet of an air pipe by using a bolt; the total length of the outlet explosion-proof pipe section must be larger than the minimum safety distance of the installed passive plate type explosion-proof valve.
10. The pressure sensor C is connected to the side wall of the outlet explosion-proof pipe section through threads, and the specific position can be automatically selected between a gas inlet and a gas outlet of the outlet explosion-proof pipe section according to the requirement and the tolerance capability of the sensor; the collecting element of the pressure sensor C is flush with the inner wall of the outlet flame-proof pipe section.
11. The airflow outlet of the air pipe is connected with the airflow inlet of the dust removal collector by using a flange; the centrifugal dust removing fan is connected with the gas outlet of the dust removing collector.
12. The communication module is connected with the data processing server by using a coaxial cable; the communication module and the data processing server adopt the same set of power switch to carry out power-on and power-off.
The invention also provides an operation method of the dust explosion simulation test device, which comprises the following steps:
the method comprises the following steps: the cleanness and dryness of the interior of the dust explosion simulation test device are confirmed through the transparent observation pipe section and the airflow inlet of the inlet explosion-proof pipe section; and confirming that the passive plate type explosion-proof valve at the airflow inlet of the inlet explosion-proof pipe section and the passive plate type explosion-proof valve at the airflow outlet of the outlet explosion-proof pipe section are installed in place.
Step two: adding dust into the simulation pipe section through the powder adding port according to the type and theoretical mass concentration of the powder to be measured; the mass of the added dust is not less than the product of the volume of the inner cavity of the simulation pipe section and the theoretical mass concentration of the dust to be measured; and sealing the powder adding port after the dust is added.
Step three: and opening the communication module and the data processing server, setting the pressure signal sampling frequency and the ignition delay time of the igniter relative to the powder supply of the powder supply tank for the communication module, and starting to acquire the change of the pressure signal.
Step four: opening a quick-opening electromagnetic valve at the powder outlet of the powder supply tank, and starting an igniter to work after corresponding ignition delay time; the pressure sensor A, the pressure sensor B and the pressure sensor C transmit the pressure change condition to the data processing server to realize the processing, recording and storing of data.
Step five: and opening the powder adding port after the pressure values measured by the pressure sensor A, the pressure sensor B and the pressure sensor C are restored to the pressure values before the test, adding sodium bicarbonate powder into the simulation pipe section, sealing the powder adding port again after the sodium bicarbonate powder is added, and standing for more than half an hour.
Step six: and disassembling the pipe sections along the airflow direction, cleaning the pipe body, and returning the passive plate type explosion-proof valve at the airflow inlet of the inlet explosion-proof pipe section and the passive plate type explosion-proof valve at the airflow outlet of the outlet explosion-proof pipe section.
In the second step, the mass of the added dust is not less than the product of the inner cavity volume of the simulation pipe section and the theoretical mass concentration of the dust to be measured.
As an improvement, in step five, in order to prevent the residual dust from generating secondary damage, sodium bicarbonate powder should be added into the simulation pipe section which completes the experiment and recovers to the pressure value before the test. The sodium bicarbonate is decomposed into carbon dioxide under the action of the residual temperature of the pipeline so as to ensure the safety of the inside of the simulation pipeline. In order to generate sufficient excess carbon dioxide from decomposition, the amount of sodium bicarbonate powder added should be less than 2/3 for the quality of the dust used in the test; the added sodium bicarbonate powder meets the sodium bicarbonate powder specified in the GB/T1606-2008 industrial sodium bicarbonate standard.
The invention has the beneficial effects that: (1) the invention realizes the high-speed on-line monitoring and acquisition of the multi-working-condition multi-mechanism broad-spectrum dust explosion characteristics by corresponding arrangement and operation through the fluid mechanics motion similarity principle. (2) According to the recording of the flow or the area of the dust explosion accident, the accident reason is determined by adjusting the working condition of the device and reproducing the accident process, so that the reliability of the accident investigation result is realized. (3) The invention simulates and tries to explode the new process and the new equipment internal flow field in the powder or dust removal industry, eliminates the related potential safety hazard and realizes the reliability of the process or equipment safety acceptance. (4) According to relevant regulations of GB15577-2018 dust explosion-proof safety regulations, the invention realizes the working purposes of accident recurrence, hidden danger investigation and extreme value verification, and fills the blank of relevant fields in China.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-inlet flame-proof pipe section, 2-detonation pipe section, 3-powder supply tank, 4-igniter, 5-pressure sensor A, 6-powder adding port, 7-simulation pipe section, 8-pressure sensor B, 9-transparent observation pipe section, 10-outlet flame-proof pipe section, 11-pressure sensor C, 12-air pipe, 13-dust removal collector, 14-centrifugal dust removal fan, 15-communication module and 16-data processing server.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1: the dust explosion simulation test device provided by the invention comprises a mechanical structure part and an electric control acquisition part.
The mechanical structure part comprises an inlet explosion-proof pipe section 1, an explosion-proof pipe section 2, a simulation pipe section 7, a transparent observation pipe section 9, an outlet explosion-proof pipe section 10, an air pipe 12, a dust removal collector 13 and a centrifugal dust removal fan 14.
An airflow inlet of the inlet explosion-proof pipe section 1 is provided with a passive plate type explosion-proof valve by using a bolt, and an airflow outlet of the inlet explosion-proof pipe section 1 is connected with an airflow inlet of the detonation pipe section 2 by using a flange; the minimum safe distance of the passive plate type explosion-proof valve at the airflow inlet of the inlet explosion-proof pipe section 1 is smaller than the length of the inlet explosion-proof pipe section 1.
Along the direction of airflow, taking an airflow inlet of the initiation pipe section 2 as a starting point, forming a hole at a position which is larger than twice the inner diameter of the initiation pipe section 2 with a circular cross section or twice the minimum side length of the initiation pipe section 2 with a rectangular cross section, and arranging an external connecting pipe; the ratio of the length of the external connecting pipe of the priming pipe section 2 from the airflow outlet of the priming pipe section 2 to the inner diameter of the priming pipe section 2 with a circular cross section or the minimum side length of the priming pipe section 2 with a rectangular cross section is not more than 3: 1; a powder supply tank 3 is arranged on the priming pipe section 2, and a powder outlet of the powder supply tank 3 is provided with a quick-opening electromagnetic valve and is connected with an external connecting pipe of the priming pipe section 2; the powder supply tank 3 should use compressed air to push the powder in the tank into the detonation tube section 2, the nominal pressure of the compressed air should not be less than 4MPa, the powder amount should not exceed 300g, and the powder type should be the same as the powder type in the simulation tube section 7. The gas outlet of the priming tube section 2 is connected with the gas flow inlet of the dummy tube section 7 by a flange. The function of the priming tube section 2 is to generate enough explosion energy to lift dust in the simulation tube section 7 and ignite smoothly, thus completing the simulation of energy transfer and explosion characteristics.
The simulation pipe section 7 is used for simulating a dust environment and is provided with a powder adding port 6, and the powder adding port 6 is welded on the outer wall of the simulation pipe section 7; a powder adding port of the powder adding port 6 is a pipe flange cover and a matched pipe flange port; the maximum value of the opening size of the powder adding opening 6 cannot exceed the outer diameter of the round simulation pipe section 7 or 1/3 of the minimum side length of the rectangular section when a rectangular pipe is adopted; the powder adding openings 6 can be multiple, and the distance between two adjacent powder adding openings 6 cannot be smaller than the inner diameter of the simulation pipe section 7 with a circular cross section or the minimum side length of the simulation pipe section 7 with a rectangular cross section; the powder adding port 6 can be welded at different positions of the simulation pipe section 7 according to specific requirements, and a powder inlet of the powder adding port 6 is strictly sealed by using a flange cover in an experimental state; the airflow inlet of the transparent observation pipe section 9 is connected with the airflow outlet of the dust environment simulation pipe section 7 through a flange.
The simulation pipe section 7 can be customized according to specific numerical values of parameters such as the pipeline form, the dust concentration and the dust type to be tested; the simulation pipe section 7 of this embodiment is a rectangular pipe, and the tensile strength σ of the pipe body material isminWall thickness of rectangular tube, maximum side length L of cross section of rectangular tuberThe following condition is satisfied:
wherein: pmaxThe theoretical maximum explosion pressure of the selected dust is given inMPa。
The airflow outlet of the transparent observation tube section 9 is connected with the airflow inlet of the outlet flame-proof tube section 10 through a flange.
An airflow outlet of the outlet explosion-proof pipe section 10 is provided with a passive plate type explosion-proof valve by using a bolt, and the outlet of the explosion-proof valve is connected with an airflow inlet of an air pipe 12 by using a bolt; the minimum safe distance of the passive plate type explosion-proof valve at the airflow outlet of the outlet explosion-proof pipe section 10 is smaller than the length of the outlet explosion-proof pipe section 10.
The airflow outlet of the air pipe 12 is connected with the airflow inlet of the dust-removing collector 13 by a flange, and the dust-removing collector 13 adopts a cloth bag dust-removing collector.
A filter screen is arranged at the air inlet of the centrifugal dust removing fan 14 and is connected with the air outlet of the dust removing collector 13; the gas flow of the centrifugal dust removal fan 14 in the experiment is similar to the gas flow of the dust environment to be simulated.
The electric control acquisition part comprises an igniter 4, a pressure sensor A5, a pressure sensor B8, a pressure sensor C11, a communication module 15 and a data processing server 16. The communication module 15 is a high-speed communication module.
The ignition energy of the igniter 4 should not be less than twice the theoretical minimum ignition energy of the dust; the power supply part of the igniter 4 is of an intrinsic safety explosion-proof type, a power supply bolt terminal of the igniter 4 is connected with a switching value outlet of the communication module 15 through a copper core wire, an opening at the ignition end of the igniter 4 is formed through pipe threads or brazing, the ignition end of the igniter 4 is installed on the inner wall of the detonation pipe section 2, and the ratio of the external pipe distance relative to the detonation pipe section 2 to the minimum side length of the detonation pipe section 2 with a circular cross section or the detonation pipe section 2 with a rectangular cross section in the airflow flowing direction is not more than 1: 1.
The pressure sensor A5 adopts a high-frequency dynamic pressure sensor, the pressure sensor A5 is connected to the side wall of the detonation tube section 2 by screw threads, the collecting element of the pressure sensor A5 is flush with the inner wall of the detonation tube section 2, and the transmitting element of the pressure sensor A5 is connected to the high-speed signal collecting inlet of the communication module 15 by a shielded wire.
The pressure sensor B8 adopts a high-frequency dynamic pressure sensor, the pressure sensor B8 is connected to the side wall of the simulation pipe section 7 by screw threads, the collecting element of the pressure sensor B8 is flush with the inner wall of the simulation pipe section 7, and the transmitting element of the pressure sensor B8 is connected to the high-speed signal collecting inlet of the communication module 15 by a shielded wire.
The pressure sensor C11 adopts a high-frequency dynamic pressure sensor, the pressure sensor C11 is connected to the side wall of the outlet explosion-proof pipe section 10 through threads, the acquisition element of the pressure sensor C11 is flush with the inner wall of the outlet explosion-proof pipe section 10, and the transmission element of the pressure sensor 11 is connected to the high-speed signal acquisition inlet of the communication module 15 through a shielded wire.
The communication module 15 is connected with the data processing server 16 by using a twisted pair; the communication module 15 is connected to the powder supply tank 3 using a shielded wire.
The assembling method and the checking method of the dust explosion simulation testing device comprise the following steps of:
1. connecting a passive plate type explosion-proof valve to an airflow inlet of an inlet explosion-proof pipe section 1 by using a bolt, wherein the explosion-proof direction of the passive plate type explosion-proof valve is towards an airflow outlet of the inlet explosion-proof pipe section 1; the total length of the inlet flame-proof pipe section 1 is required to be larger than the minimum safety distance of the installed passive plate type flame-proof valve.
2. An airflow outlet of the inlet explosion-proof pipe section 1 is connected to an airflow inlet of the detonation pipe section 2 by using a flange, an opening is formed at a position, at which the ratio of the length of the airflow outlet of the inlet explosion-proof pipe section 1 to the airflow inlet of the detonation pipe section 2 along the airflow direction to the inner diameter of the detonation pipe section 2 with a circular cross section or the minimum side length of the detonation pipe section 2 with a rectangular cross section is not less than 2:1, and an external connecting pipe is arranged; the ratio of the distance from the airflow outlet of the initiation pipe section 2 to the external connecting pipe of the initiation pipe section 2 to the inner diameter of the initiation pipe section 2 with a circular cross section or the minimum side length of the initiation pipe section 2 with a rectangular cross section is not more than 3: 1. The external connecting pipe is connected with a quick-opening electromagnetic valve of a powder outlet of the powder supply tank 3.
3. In the airflow flowing direction of the initiation pipe section 2, an opening is formed at a position where the ratio of the external connection distance of the initiation pipe section 2 to the inner diameter of the initiation pipe section 2 with a circular cross section or the minimum side length of the initiation pipe section 2 with a rectangular cross section is not more than 1:1, and the opening is used for arranging an ignition end of an igniter 4. The power bolt terminal of the igniter 4 is arranged on the outer wall of the detonation pipe section 2, is connected with the switching value outlet of the communication module 15 by using a copper core wire, and ensures that a power supply part of the igniter 4 is of an intrinsic safety explosion-proof type, and the hole at the ignition end of the igniter 4 is ensured to be free from leakage in a high-pressure environment by using pipe threads or brazing.
4. The pressure sensor a5 is screwed onto the side wall of the initiation tube section 2, and the specific location can be selected autonomously between the firing tip of the igniter 4 and the gas outlet of the initiation tube section 2, depending on the requirements and sensor tolerance. The pick-up element of the pressure sensor a5 should be flush with the inner wall of the detonation tube segment 2.
5. The gas outlet of the priming tube section 2 is connected with the gas flow inlet of the dummy tube section 7 by a flange. The simulation pipe section 7 can be customized according to specific values of parameters such as the pipeline form, the dust concentration and the dust type to be tested.
6. The powder adding ports 6 are arranged on the outer wall of the simulation pipe section 7 in a hole-opening and welding mode, the number of the powder adding ports 6 can be more than one, and the ratio of the distance between every two adjacent powder adding ports 6 to the inner diameter of the section of the circular simulation pipe section 7 or the minimum side length of the section of the rectangular simulation pipe section 7 is not less than 1: 1; the maximum value of the opening size of the powder adding opening 6 cannot exceed 1/3 of the outer diameter of the section of the circular simulated tube section 7 or the minimum side length of the section of the rectangular simulated tube section 7; the powder inlet of the powder adding port 6 is provided with flange side skirts, and flange covers of corresponding types are configured, so that strict sealing is realized during experiments.
7. The pressure sensor B8 is connected to the side wall of the simulation pipe section 7 by using threads, and the specific position can be automatically selected between a gas inlet and a gas outlet of the simulation pipe section 7 according to the requirement and the tolerance capability of the sensor; the pick-up element of the pressure sensor B8 should be flush with the inner wall of the simulated pipe section 7.
8. The airflow inlet of the transparent observation pipe section 9 is connected with the airflow outlet of the dust environment simulation pipe section 7 through a flange. The airflow outlet of the transparent observation tube section 9 is connected with the airflow inlet of the outlet flame-proof tube section 10 through a flange.
9. An airflow outlet of the outlet explosion-proof pipe section 10 is provided with a passive plate type explosion-proof valve by using a bolt, and an outlet of the explosion-proof valve is connected with an airflow inlet of an air pipe 12 by using a bolt; the total length of the outlet flame-proof pipe section 10 is required to be larger than the minimum safety distance of the installed passive plate type flame-proof valve.
10. The pressure sensor C11 is connected to the side wall of the outlet flame-proof pipe section 10 by using threads, and the specific position can be automatically selected between a gas inlet and a gas outlet of the outlet flame-proof pipe section 10 according to the requirement and the tolerance capability of the sensor; the collecting element of pressure sensor C11 should be flush with the inner wall of outlet flame-proof tube section 10.
11. The airflow outlet of the air pipe 12 is connected with the airflow inlet of the dust removal collector 13 by using a flange; the centrifugal dust removing fan 14 is connected to a gas outlet of the dust removing collector 13.
12. The communication module 15 is connected with the data processing server 16 by using a twisted pair; the communication module 15 and the data processing server 16 are powered on and powered off by using the same set of power switch.
The embodiment also provides an operation method of the dust explosion simulation testing device, which comprises the following steps:
the method comprises the following steps: before the test is started, the cleanness and dryness of the interior of the test device are confirmed through visible windows such as airflow inlets of the transparent observation pipe section 9 and the inlet explosion-proof pipe section 1; no dust, water drops, oil drops or other impurities visible to the naked eye exist in the device; the installation of the passive plate type explosion-proof valve at the airflow inlet of the inlet explosion-proof pipe section 1 and the passive plate type explosion-proof valve at the airflow outlet of the outlet explosion-proof pipe section 10 in place is confirmed, and the action is reliable; the testing step can be performed.
Step two: after the safety measures are confirmed, certain mass of dust is added into the simulation pipe section 7 through the powder adding port 6 according to the type and theoretical mass concentration of the powder to be measured; the mass of the added dust is not less than the product of the volume of the inner cavity of the simulation pipe section 7 and the theoretical mass concentration of the dust to be measured; the powder inlet 6 should be reliably sealed with a flange cover after the dust has been added.
Step three: after the powder adding operation is finished, the power-on switches of the communication module 15 and the data processing server 16 are turned on, after the communication module 15 and the data processing server 16 are started, the high-speed communication module 15 is set with the pressure signal sampling frequency and the ignition delay time of the igniter 4 relative to the powder supply of the powder supply tank 3, and the pressure signal change starts to be collected.
Step four: after the relevant trial setting of the communication module 15 is finished, opening a quick-opening electromagnetic valve at the powder outlet of the powder supply tank 3, and starting the igniter to work after the corresponding ignition delay time; at this time, the pressure sensor a5, the pressure sensor B8 and the pressure sensor C11 transmit the pressure change in the testing device to the communication module 15, and implement the processing, recording and storing of data in the data processing server 16 through twisted pair.
Step five: when the pressure values measured by the pressure sensor A5, the pressure sensor B8 and the pressure sensor C11 are recovered to the pressure values before the test, the flange cover of the powder adding port 6 is detached, and the superfine sodium bicarbonate powder is added into the test device, wherein the adding amount of the superfine sodium bicarbonate powder cannot be less than 2/3 of the mass of the dust used for the test; and after the superfine sodium bicarbonate powder is added, sealing the powder adding port 6 by using a flange cover again and standing for half an hour.
Step six: after half an hour after the superfine sodium bicarbonate powder is added, disassembling the dust explosion simulation test device along the airflow direction according to the pipe section, pushing the residual dust out of the pipe section by using a wet push rod and collecting by using a water-containing collecting bag; and (3) wiping the inner wall of the pipe section by using wet cloth and drying, and resetting the passive plate type explosion-proof valve at the airflow inlet of the inlet explosion-proof pipe section 1 and the passive plate type explosion-proof valve at the airflow outlet of the outlet explosion-proof pipe section 10 to wait for the next test.
Example two:
the difference from the dust explosion simulation test device of the first embodiment is that: the simulated tube section 7 is a circular tube, the tensile strength sigma of the tube material of which isminWall thickness of round tube and outer diameter D of round tuberThe following conditions are satisfied:
wherein: pmaxThe theoretical maximum explosion pressure of the selected dust,the units are in MPa.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (13)
1. A dust explosion simulation test device comprises a mechanical structure part and an electric control acquisition part; the method is characterized in that: the mechanical structure part comprises an inlet explosion-proof pipe section (1), a detonation pipe section (2), a simulation pipe section (7) and an outlet explosion-proof pipe section (10) which are connected in sequence; a powder supply tank (3) is arranged on the detonation pipe section (2), and a powder adding port (6) is arranged on the simulation pipe section (7);
the electronic control acquisition part comprises a communication module (15), and an igniter (4), a pressure sensor A (5), a pressure sensor B (8), a pressure sensor C (11) and a data processing server (16) which are respectively connected with the communication module (15);
the detonation pipe section (2) is respectively connected with the igniter (4) and the pressure sensor A (5), the simulation pipe section (7) is connected with the pressure sensor B (8), the outlet explosion-proof pipe section (10) is connected with the pressure sensor C (11), and the powder supply tank (3) is connected with the communication module (15);
a transparent observation pipe section (9) is arranged between the simulation pipe section (7) and the outlet flame-proof pipe section (10);
the outer wall of the initiation pipe section (2) is provided with an opening and an external connecting pipe; a quick-opening electromagnetic valve is arranged at the outlet of the powder supply tank (3) and is connected with an external connecting pipe;
the priming pipe section (2) adopts a rectangular pipe or a circular pipe; the ratio of the length of the external connecting pipe of the initiation pipe section (2) to the airflow inlet of the initiation pipe section (2) to the inner diameter of the circular initiation pipe section (2) or the minimum side length of the rectangular initiation pipe section (2) is not less than 2:1, and the ratio of the length of the external connecting pipe of the initiation pipe section (2) to the airflow outlet of the circular initiation pipe section (2) or the minimum side length of the rectangular initiation pipe section (2) is not more than 3: 1.
2. A dust explosion simulation test device according to claim 1, wherein: the ignition end of the igniter (4) is arranged on the inner wall of the detonation tube section (2), and the ratio of the distance between the ignition end of the igniter (4) and the external connecting tube of the detonation tube section (2) to the inner diameter of the circular detonation tube section (2) or the minimum side length of the rectangular detonation tube section (2) is not more than 1: 1.
3. A dust explosion simulation test device according to claim 2, wherein: the opening at the firing end of the igniter (4) is formed by using pipe threads or brazing.
4. A dust explosion simulation test device according to claim 2, wherein: the power supply part of the igniter (4) adopts an intrinsic safety explosion-proof type.
5. A dust explosion simulation test device according to claim 2, wherein: the ignition energy of the igniter (4) is not less than twice the theoretical minimum ignition energy of the dust.
6. A dust explosion simulation test device according to claim 1, wherein: the pressure sensor A (5) is connected to the side wall of the detonation tube section (2), and a collecting element of the pressure sensor A (5) is flush with the inner wall of the detonation tube section (2); the pressure sensor B (8) is connected to the side wall of the simulation pipe section (7), and a collecting element of the pressure sensor B (8) is flush with the inner wall of the simulation pipe section (7); the pressure sensor C (11) is connected to the side wall of the outlet flame-proof pipe section (10), and an acquisition element of the pressure sensor C (11) is flush with the inner wall of the outlet flame-proof pipe section (10).
7. A dust explosion simulation test device according to claim 1, wherein: the simulation pipe section (7) is a rectangular pipe, and the tensile strength sigma of the pipe body material isminWall thickness of the tube, maximum side length L of the tube cross sectionrThe following condition is satisfied:
wherein: pmaxThe theoretical maximum explosion pressure of the selected dust.
8. A dust explosion simulation test device according to claim 1, wherein: the simulation pipe section (7) adopts a circular pipe, and the tensile strength sigma of the pipe body material of the circular pipeminWall thickness of pipe and outer diameter D of pipe sectionrThe following conditions are satisfied:
wherein: pmaxThe theoretical maximum explosion pressure of the selected dust.
9. A dust explosion simulation test device according to claim 1, wherein: the number of the powder adding openings (6) is not less than 1, the opening size of the powder adding openings (6) is not more than 1/3 of the outer diameter of the circular simulation pipe section (7) or the minimum side length of the rectangular simulation pipe section (7), and the ratio of the distance between two adjacent powder adding openings (6) to the inner diameter of the cross section of the circular simulation pipe section (7) or the minimum side length of the cross section of the rectangular simulation pipe section (7) is not less than 1: 1.
10. A dust explosion simulation test device according to claim 1, wherein: the communication module (15) is connected with the data processing server (16) by a twisted pair, the communication module (15) is respectively connected with the powder supply tank (3) by a shielded wire, and the communication module (15) is connected with the igniter (4) by a copper core wire.
11. A method of operating a dust explosion simulation test apparatus according to any one of claims 1 to 10, comprising the steps of:
the method comprises the following steps: the cleanness and dryness of the interior of the dust explosion simulation test device are confirmed through the transparent observation pipe section (9) and the airflow inlet of the inlet explosion-proof pipe section (1); confirming that a passive plate type explosion-proof valve at an airflow inlet of the inlet explosion-proof pipe section (1) and a passive plate type explosion-proof valve at an airflow outlet of the outlet explosion-proof pipe section (10) are installed in place;
step two: adding dust into the simulation pipe section (7) through the powder adding port (6) according to the type and theoretical mass concentration of the powder to be measured; sealing the powder adding port (6) after the dust is added;
step three: opening the communication module (15) and the data processing server (16), setting the pressure signal sampling frequency and the ignition delay time of the igniter (4) relative to the powder supply of the powder supply tank (3) for the communication module (15), and starting to acquire the change of the pressure signal;
step four: opening a valve at a powder outlet of the powder supply tank (3), and starting the igniter (4) to work after corresponding ignition delay time; the pressure sensor A (5), the pressure sensor B (8) and the pressure sensor C (11) transmit the pressure change situation to the data processing server (16) to realize the processing, recording and storing of data;
step five: after the pressure values measured by the pressure sensor A (5), the pressure sensor B (8) and the pressure sensor C (11) are recovered to the pressure values before testing, opening the powder adding port (6), adding sodium bicarbonate powder into the simulation pipe section (7), sealing the powder adding port (6) again and standing for not less than half an hour;
step six: disassembling the pipe sections along the airflow direction, cleaning the pipe body, and returning the passive plate type explosion-proof valve at the airflow inlet of the inlet explosion-proof pipe section (1) and the passive plate type explosion-proof valve at the airflow outlet of the outlet explosion-proof pipe section (10).
12. The operating method according to claim 11, characterized in that: in the second step, the mass of the added dust is not less than the product of the volume of the inner cavity of the simulation pipe section (7) and the theoretical mass concentration of the dust to be measured.
13. The operating method according to claim 11, characterized in that: in step five, the amount of sodium bicarbonate powder added cannot be less than 2/3 for the quality of dust used in the test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910687644.5A CN110389152B (en) | 2019-07-29 | 2019-07-29 | Dust explosion simulation testing device and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910687644.5A CN110389152B (en) | 2019-07-29 | 2019-07-29 | Dust explosion simulation testing device and operation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110389152A CN110389152A (en) | 2019-10-29 |
| CN110389152B true CN110389152B (en) | 2020-09-04 |
Family
ID=68287793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910687644.5A Active CN110389152B (en) | 2019-07-29 | 2019-07-29 | Dust explosion simulation testing device and operation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110389152B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022204458A1 (en) * | 2021-03-25 | 2022-09-29 | Fike Corporation | System and method for detecting and suppressing dust explosions |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267531A (en) * | 2021-06-29 | 2021-08-17 | 北京石油化工学院 | Testing device and testing method for inducing dust cloud explosion by smoldering of dust layer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604833A (en) * | 2013-11-07 | 2014-02-26 | 安徽理工大学 | Coal-dust explosion characteristic test system and coal-dust explosion characteristic test method |
| CN208239439U (en) * | 2018-02-12 | 2018-12-14 | 北京石油化工学院 | A kind of quick-fried experimental provision of dust prevention and control |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576521B (en) * | 2009-06-10 | 2011-06-15 | 西安科技大学 | Device for testing explosion, spreading and explosion suppression characteristics of inflammable gas and dust |
| KR101268341B1 (en) * | 2011-11-08 | 2013-05-28 | 주식회사 포스코 | Apparatus for mearsuring cokes of blast furnace |
| CN204228646U (en) * | 2014-10-20 | 2015-03-25 | 中国人民解放军总后勤部油料研究所 | A kind of block blast-proof materials explosion-proof performance Analytical system |
| CN205426830U (en) * | 2016-03-23 | 2016-08-03 | 中国矿业大学 | Gas explosion causes coal dust explosion's analogue means |
| CN205562533U (en) * | 2016-04-25 | 2016-09-07 | 河南工程学院 | Secondary explosion test device |
| CN106841300B (en) * | 2017-03-24 | 2020-04-28 | 上海化工研究院有限公司 | Combined industrial dust explosion simulation demonstration system |
| CN106979959B (en) * | 2017-03-31 | 2019-06-11 | 大连理工大学 | Dust explosion flame transmission measuring behavior experimental system |
| CN107290388A (en) * | 2017-07-31 | 2017-10-24 | 安徽理工大学 | A kind of ABC ultra-fine dry powders carry out datonation-inhibition experimental provision |
-
2019
- 2019-07-29 CN CN201910687644.5A patent/CN110389152B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604833A (en) * | 2013-11-07 | 2014-02-26 | 安徽理工大学 | Coal-dust explosion characteristic test system and coal-dust explosion characteristic test method |
| CN208239439U (en) * | 2018-02-12 | 2018-12-14 | 北京石油化工学院 | A kind of quick-fried experimental provision of dust prevention and control |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022204458A1 (en) * | 2021-03-25 | 2022-09-29 | Fike Corporation | System and method for detecting and suppressing dust explosions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110389152A (en) | 2019-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110389152B (en) | Dust explosion simulation testing device and operation method thereof | |
| CN112082798A (en) | Visual test device for accurately testing unsteady detonation flame arrester effect of combustible gas | |
| CN112345587B (en) | Device and method for testing explosion-proof performance of negative pressure environment explosion protection product | |
| CN107290388A (en) | A kind of ABC ultra-fine dry powders carry out datonation-inhibition experimental provision | |
| CN104949831A (en) | Online checking device and methods for pilot valve and main valve of pilot operated safety valve | |
| CN112345588B (en) | Device and method for testing explosion-proof performance of positive pressure environment explosion protection product | |
| CN111487053A (en) | Flame arrester test system | |
| CN111624228A (en) | Dust explosion experimental device | |
| CN112556912A (en) | Parameter-adjustable terrorist explosion shock wave effect simulation system | |
| CN106581916A (en) | Dust explosion suppression device in confined space and trigger method of dust explosion suppression device | |
| CN218918244U (en) | Smoke sensor calibration device | |
| CN104390533A (en) | Detonator delay time tester | |
| CN103808501A (en) | On-line calibration device for breather valve | |
| CN204944772U (en) | A kind of source of the gas steering gear system experiment test equipment | |
| CN107941568B (en) | Sampling system for gas in explosive atmosphere test box | |
| CN114720892A (en) | Battery thermal failure test system | |
| CN204731018U (en) | Pilot valve and main valve on-line testing device in pilot operated safety valve | |
| CN106706452B (en) | Controllable fire-retardant core antiknock testing arrangement | |
| CN211455070U (en) | Explosion-proof experiment system | |
| CN114062816A (en) | Electric explosion valve test system and test method thereof | |
| CN109682272A (en) | A kind of shock wave apparatus to cause bursting | |
| CN202794084U (en) | Multifunctional testing device for suppressing explosion of combustible gas by using fine water mist | |
| CN215931311U (en) | Explosion test device for explosion control device | |
| CN218098229U (en) | Detection system for testing explosive shock wave bearing performance of equipment | |
| CN206193189U (en) | Portable transformer buchholz relay calibration equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |