CN113552169A - Device and method for testing characteristic parameters of combustible gas flowing and blasting process - Google Patents
Device and method for testing characteristic parameters of combustible gas flowing and blasting process Download PDFInfo
- Publication number
- CN113552169A CN113552169A CN202010329103.8A CN202010329103A CN113552169A CN 113552169 A CN113552169 A CN 113552169A CN 202010329103 A CN202010329103 A CN 202010329103A CN 113552169 A CN113552169 A CN 113552169A
- Authority
- CN
- China
- Prior art keywords
- combustible gas
- flowing
- characteristic parameters
- testing
- combustion
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 230000008569 process Effects 0.000 title claims abstract description 50
- 238000005422 blasting Methods 0.000 title claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 94
- 238000004880 explosion Methods 0.000 claims abstract description 57
- 238000003384 imaging method Methods 0.000 claims abstract description 24
- 238000001499 laser induced fluorescence spectroscopy Methods 0.000 claims abstract description 24
- 238000000917 particle-image velocimetry Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 205
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 42
- 238000005259 measurement Methods 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 238000009826 distribution Methods 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 17
- 238000010926 purge Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 4
- 230000035939 shock Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 238000005474 detonation Methods 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005112 continuous flow technique Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003860 storage 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Combustion & Propulsion (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Optics & Photonics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a device and a method for testing characteristic parameters of a combustible gas flowing and blasting process, wherein the device comprises: the hollow structure of the flowing combustion pipe provides a space for flowing and burning of combustible gas, and the flowing combustion pipe is filled with normal-pressure air before testing; the ignition electrode is inserted in the air inlet side of the tube body of the flow combustion tube, and an opening is formed at one end of the flow combustion tube, which is far away from the air inlet side of the tube body; the particle image velocimetry unit is used for measuring the flow field characteristic parameters of the combustible gas after combustion; and the laser-induced fluorescence imaging unit is used for synchronously measuring the flame characteristic parameters of the combusted flowing combustible gas. The device and the method can test the characteristic parameters of the continuous flowing and burning explosion process of the combustible gas under different pressures and temperatures, and accurately capture the flame and flow field structures in the burning explosion process of the combustible gas in the flowing state.
Description
Technical Field
The invention relates to the field of combustible gas explosion protection, in particular to a device and a method for testing characteristic parameters, flame forms, flow field structures and the like of combustible gas in flowing and explosion processes under certain temperature and pressure conditions.
Background
The safety of combustible gases such as hydrogen, methane and the like runs through all links such as production, storage, transportation, use and the like, and the combustible gases generally have the characteristics of low molecular weight, small ignition energy, wide explosion limit range and the like, and are easy to leak to cause fire and explosion accidents. Especially, under the conditions of high temperature and high pressure of a process device, combustible gas is easy to combust and explode, and serious threats are generated to operators and equipment, so that the initiation conditions and consequence parameters of combustible gas explosion need to be fully known, and a foundation is provided for understanding the combustible gas explosion mechanism and developing a safety protection technology.
At present, the research on the explosion characteristic parameters such as the explosion limit and the explosion pressure of combustible gas mainly adopts the standard 20L or 1m3Equipment such as explosion balls and shock tubes are used for inspecting ignition conditions, explosion evolution processes and various influence factors thereof. CN 108627608A discloses a tubular testing device and testing method for ignition sensitivity of combustible gas under flowing condition, which can test the minimum ignition energy and ignition sensitivity of flowing gas. CN205643223U discloses a restricted space gas burning explosion flow disturbance testing device, which can test the restricted space under various conditionsAnd the gas in the chamber is exploded and disturbed. However, the current combustible gas explosion characteristic test device and test method have the following problems: (1) the experimental device can only test the explosion parameters of static combustible gas under different initial conditions, but can not effectively capture the fine structures of flame structure, jet flow field and other explosion processes, and can not accurately reflect the interaction mechanism between gas flow and combustion; (2) the experimental device can only carry out tests on the blasting behavior of combustible gas in the air at normal temperature and normal pressure, and cannot research the blasting rules of the combustible gas at different temperatures and pressures; (3) the current experimental tests are mainly directed to intermittent gas jets or stationary gas, which is very different from the actual continuous flow situation.
Aiming at the current combustible gas explosion parameter testing device and method, only aiming at static gas, the testing temperature and pressure range is limited (generally 0-200 ℃, 0-5 Mpa), therefore, a testing device and method for combustible gas continuous flow and explosion process characteristic parameter experiment under different pressures and temperatures are urgently needed, and meanwhile, the flame and flow field structure in the combustible gas explosion process under the flowing state can be accurately captured, so that the interaction relation between gas flow and flame propagation can be disclosed, and the explosion parameters such as flow field distribution, concentration distribution, flame propagation speed, explosion limit and explosion pressure of the combustible gas under different pressures, temperatures and flowing states can be researched.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a device and a method for testing characteristic parameters of a continuous flowing and burning explosion process of combustible gas under different pressures and temperatures, so that flame and flow field structures in the burning explosion process of the combustible gas in a continuous flowing state can be accurately captured.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a device for testing characteristic parameters of a combustible gas flow and explosion process, comprising: the hollow structure of the flowing combustion pipe provides a space for flowing and burning of combustible gas, and the flowing combustion pipe is filled with normal-pressure air before testing; the ignition electrode is inserted in the air inlet side of the tube body of the flow combustion tube, and an opening is formed at one end of the flow combustion tube, which is far away from the air inlet side of the tube body; the particle image velocimetry unit is used for measuring the flow field characteristic parameters of the combustible gas after combustion; and the laser-induced fluorescence imaging unit is used for synchronously measuring the flame characteristic parameters of the combusted flowing combustible gas.
Further, in the above technical solution, the method further includes: and an air inlet nozzle which injects the combustible gas from the air inlet pipeline into the flow combustion pipe.
Further, in the above technical solution, the method further includes: the pressure sensor is arranged in a measuring hole on the surface of the tube body of the flow combustion tube and used for detecting the pressure change of combustible gas in the flow combustion tube after combustion and sending data to the control unit; the temperature sensor is arranged in a measuring hole on the surface of the tube body of the flowing combustion tube and used for detecting the temperature change of the combustible gas in the flowing combustion tube after combustion and sending data to the control unit; and the flame sensor is arranged in the measuring hole on the surface of the flowing combustion pipe body and used for detecting photoelectric data of the combustible gas in the flowing combustion pipe after combustion and sending the data to the control unit.
Further, among the above-mentioned technical scheme, the air intake nozzle front end can set up the spark arrester for prevent that combustible gas from igniting in advance or flame from anti-cluster to upstream pipeline.
Further, among the above-mentioned technical scheme, the flow combustion tube outside can twine glass fiber electric heating area, and this electric heating area is wrapped up by thermal-insulated cotton.
Furthermore, among the above-mentioned technical scheme, can be equipped with transparent glass window on the body of flow burner tube.
Further, in the above technical solution, the synchronous measurement may specifically be: focusing the detection planes of the particle image speed measurement unit and the laser-induced fluorescence imaging unit to the same measurement area, synchronously adjusting parameters of the particle image speed measurement unit and the laser-induced fluorescence imaging unit, such as laser pulse frequency, camera shutter width, detection time interval and the like, and acquiring data through a transparent glass window.
Further, in the above technical solution, the flow field characteristic parameters include but are not limited to: velocity field distribution information, vortex structure information, shock wave information, and/or shear layer information, etc. Flame characteristic parameters include, but are not limited to: flame morphology information and/or flame front structure information of the flame propagation process.
Furthermore, in the above technical scheme, a nitrogen purging pipeline can be arranged at the position of the air inlet pipeline.
According to a second aspect of the invention, the invention provides a method for testing characteristic parameters of a combustible gas flowing and blasting process, which comprises the following steps: filling air in the flowing combustion pipe and keeping the air pressure in the pipe at normal pressure; the combustible gas from the air inlet pipeline is adjusted to the temperature and the pressure set by the testing working condition, and the combustible gas enters the flowing combustion pipe to be mixed with air; the combustible gas is combusted under the action of the ignition electrode and is spread in the flow combustion tube; and synchronously measuring the flow field characteristic parameters and the flame characteristic parameters after the combustible gas is combusted.
Further, in the above technical scheme, the temperature range set by the test working condition may be room temperature to 500 ℃; the pressure may range from 0.1 to 20 Mpa.
Further, in the above technical solution, the synchronous measurement may specifically be: focusing the detection planes of the particle image velocimetry unit and the laser-induced fluorescence imaging unit to the same measurement area, and synchronously adjusting the laser pulse frequency, the camera shutter width, the detection time interval parameters and the like of the particle image velocimetry unit and the laser-induced fluorescence imaging unit.
Further, in the above technical solution, the method further includes: and detecting pressure change data, temperature change data and/or photoelectric data after the combustible gas in the flowing combustion pipe is combusted, and sending the data to the control unit.
Further, in the above technical scheme, nitrogen purging can be performed on the whole pipeline of the testing device before testing, so that residual gas in the testing device is removed, and the air tightness of the testing device is detected.
Compared with the prior art, the invention has the following beneficial effects:
1. the testing device can accurately capture flame and flow field structures in the combustible gas explosion process in the flowing state;
2. the visualization of information such as flow field, concentration field, flame form and the like in the gas flowing and blasting process can be realized;
3. the method can test the flow field distribution, concentration distribution, flame propagation speed, explosion limit, explosion pressure and other explosion parameters of the combustible gas under different pressures, temperatures and flowing states;
4. the flame arrester arranged at the front end of the gas flow combustion pipe can prevent gas from being ignited in advance or flame from reversely crossing an upstream pipeline;
5. a nitrogen purging pipeline is arranged at the gas source of the gas inlet pipeline, so that the pipeline and equipment can be effectively cleaned before formal testing;
6. the gas mixer is arranged before the gas enters the combustion tube, so that the combustible gas and the oxidizing gas can be fully mixed.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means implementable in accordance with the contents of the description, and to make the above and other objects, technical features, and advantages of the present invention more comprehensible, one or more preferred embodiments are described below in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic connection diagram of a device for testing characteristic parameters of combustible gas flowing and blasting processes.
Description of the main reference numerals:
1-an air inlet pipeline; 2-purging the pipeline with nitrogen; 3-an electric heater; 4-thermometer; 5-flame arrestors; 6-pressure regulating valve; 7-an air inlet nozzle; 8-a pressure gauge; 9-an ignition electrode; 10-a temperature sensor; 11-a pressure sensor; 12-a flame sensor; 13-a safety valve; 14-a shut-off valve; 15-a vacuum pump; 16-a gas flow burner tube; 17-heating belt and insulating layer; 18-data acquisition and control computer; 19-a particle image velocimetry unit; 20-laser induced fluorescence imaging unit.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The article may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
The invention can test the characteristic parameters of the continuous flowing and explosion process of the combustible gas under different pressures and temperatures, can accurately capture the flame and flow field structure in the explosion process of the combustible gas under the flowing state, and researches the explosion parameters such as the flow field distribution, the concentration distribution, the flame propagation speed, the explosion limit and the explosion pressure of the combustible gas under different pressures, temperatures and flowing states. And the visualization of information such as flow field, concentration field, flame form and the like in the gas flowing and blasting process can be realized.
As shown in fig. 1, the test apparatus of the present invention comprises a gas flow burner 16 and an air inlet nozzle 7, the hollow structure of the gas flow burner 16 provides a space for the flow and combustion of combustible gas, and the flow burner is filled with atmospheric air before the test. The ignition electrode 9 is inserted into the body intake side of the flow combustion tube 16. An opening (not shown in the figure) is formed in one end, far away from the air inlet side of the tube body, and the non-closed state of the tube body enables the test gas to keep a continuous flowing state, so that the actual working condition can be better simulated. The inlet nozzle 7 injects combustible gas from an inlet line (connected to a gas cylinder or compressor, not shown) into the flow duct 16. Specifically, combustible gas from a gas cylinder or a compressor enters the electric heater 3 to be heated to the working condition temperature to be measured, the temperature range is room temperature-500 ℃, and the pressure range is 0.1-20 Mpa. Combustible gas at a certain temperature enters the gas flow combustion tube 16 through the pressure regulating valve 6 (for pressure reduction) and the gas inlet nozzle 7 at a certain inlet pressure and speed. Preferably, but not limitatively, a flame arrestor 5 is provided at the front end of the inlet nozzle 7, the flame arrestor 5 preventing pre-ignition of gases or flame back-streaming to upstream piping. The diameter range of the inlet of the air inlet nozzle 7 is changeable within 5 mm-100 mm. The pressure and temperature of the gas are recorded and controlled prior to entering the flow/combustion conduit.
Further, in one or more exemplary embodiments of the present invention, the gas flow combustion tube 16 may be processed into pipes with different lengths and different pipe diameters, the length range is 1 m-10 m, and the pipe diameter range is 10 mm-500 mm, so as to examine the combustible gas flow and the explosion process in the pipes with different lengths and pipe diameters. The flange plate, the gasket and the nut which are made of the same material are utilized to seal two sides of the pipe body, an ignition hole is reserved in the flange plate on the air inlet side, the ignition electrode 9 is conveniently inserted, and the ignition electrode 9 can adjust voltage to realize different ignition energies through computer control. As further shown in fig. 1, a layer of glass fiber electrical heating tape is wound on the outer side of the gas flow combustion tube 16, and the heating tape is wrapped with heat insulation cotton to form a heating tape and a heat insulation layer 17, so as to reduce the heat dissipation to the surrounding air.
A plurality of measuring holes are uniformly arranged on the surface of the tube body of the gas flow combustion tube 16, and a temperature sensor 10, a pressure sensor 11, a flame sensor 12 and the like are arranged in the measuring holes. The gas flow combustion tube 16 is connected with a section of transparent glass window pipeline through a flange, and is used for measurement of a particle image speed measurement unit 19 and a laser-induced fluorescence imaging unit 20. The particle image speed measurement unit 19 is used for collecting the velocity field characteristic parameters of the burning flowing combustible gas and sending the data to the control unit, and the laser-induced fluorescence imaging unit 20 is used for collecting the flame characteristic parameters of the burning flowing combustible gas and sending the data to the control unit. The particle image velocimetry unit 19 and the laser-induced fluorescence imaging unit 20 adopt a synchronous measurement mode, specifically, detection planes of the particle image velocimetry unit 19 and the laser-induced fluorescence imaging unit 20 are focused on the same measurement area, and parameters such as laser pulse frequency, camera shutter width, detection time interval and the like of the particle image velocimetry unit 19 and the laser-induced fluorescence imaging unit 20 are synchronously adjusted. The laser light emitting frequencies of the two laser light emitting frequencies are set to be the same through focusing to a measuring area in a transparent glass window, so that the flow information such as velocity field distribution, vortex structures, shock waves and/or shear layers and the like in the gas flow process and the information such as flame shapes and/or flame front structures in the flame propagation process are recorded simultaneously. Through synchronous measurement, the flame and flow field structure in the combustible gas explosion process in a turbulent flow state can be synchronously and accurately captured, so that the interaction relationship between gas flow and flame propagation can be revealed.
As further shown in fig. 1, the temperature sensor 10, the pressure sensor 11 and the flame sensor 12 are disposed in a measuring hole on the surface of the gas flow combustion tube 16, and are configured to detect temperature changes, pressure changes and photoelectric data of the combustible gas in the gas flow combustion tube 16 after combustion, and send the data to a control unit, the control unit of the present invention is specifically a data acquisition and control computer 18, and the control unit may also be a single chip or a programmable controller, etc. The temperature, pressure, photoelectric data, and the like on the pipeline, as well as the flow information data and the flame measurement data can be sent to the data acquisition and control system 18 for data recording and control.
Preferably, but not limitatively, the gas flow combustion tube 16 of the present invention is further provided at the front end thereof with a temperature gauge 4 and a pressure gauge 8, which can observe the temperature and pressure of the intake side in real time. A safety valve 13 is arranged on the pipe body of the gas flow combustion pipe 16 and is used for preventing the equipment from being damaged by overpressure in the gas explosion process. And a nitrogen purging pipeline 2 is arranged at the gas source of the gas inlet pipeline 1 and is used for cleaning pipelines and equipment. The gas flow burner 16 is connected at its tubular end to a shut-off valve 14 and a vacuum pump 15 for removing air or residual gas from the test apparatus of the present invention.
It should be noted that the testing device of the present invention may also directly simulate the combustible gas leakage diffusion process without igniting the combustible gas, and study the flow state or flow field distribution of the gas when the gas is jetted at a certain pressure and flow rate in the pipeline.
The electric heater 3, the pressure regulating valve 6, the air inlet nozzle 7 and the like are arranged in the testing device, so that the testing of the flowing state and the explosion characteristic of combustible gas under different initial temperature and pressure conditions can be realized, and the explosion characteristic under different gas flowing states can be inspected. The testing device can measure the temperature, pressure and other parameters of the combustible gas in the burning and explosion process, can also accurately measure the velocity field distribution through the particle image velocimetry unit 19, and can capture the microstructure of the flame array surface through the laser-induced fluorescence imaging unit 20.
The test method of the invention is as follows:
in the test preparation stage, firstly, the whole test device is purged through a nitrogen purging pipeline 2, and residual gas in the device is discharged; then opening the stop valve 14 and the vacuum pump 15, closing the nitrogen purging pipeline 2, and draining the nitrogen in the device; then the stop valve 14 and the vacuum pump 15 are closed, and the air tightness of the device is judged through the pressure gauge 8; the gas flow burner tube 16 was then filled with air to restore the air pressure to atmospheric pressure prior to the actual test.
In the testing stage, according to the required working condition, firstly, the combustible gas is heated to the set temperature through the electric heater 3, the pressure of the combustible gas is controlled through the pressure regulating valve 6 after passing through the flame arrester 5, the combustible gas enters the gas flow combustion pipe 16 through the gas inlet nozzle 7, and the temperature and pressure data of the gas in the gas inlet side pipeline are collected by the thermometer 4 and the pressure gauge 8 and then are sent to the data collection and control computer 18.
The temperature in the gas flow burner 16 may be set to the same temperature as the electric heater 3 or may be set to a different temperature. After entering the flow combustion tube 16, the combustible gas is mixed with air pre-filled in the tube, the gas is ignited by the ignition electrode 9, the gas is combusted and spread in the tube, the temperature sensor 10, the pressure sensor 11 and the flame sensor 12 which are uniformly arranged on the tube body respectively acquire temperature, pressure and photoelectric data, the particle image speed measurement unit 19 records the flow field characteristic parameters of the gas, including but not limited to information such as velocity field distribution, flow field structure and the like, the laser-induced fluorescence imaging unit 20 acquires information such as flame shape, structure and the like, the data are transmitted to the control computer 18 by the sensors and the data acquisition cards of the units, and the data information such as explosion limit, explosion pressure, combustion temperature, flame propagation speed, flame structure and shape, velocity field distribution and the like of the combustible gas under different initial conditions can be obtained.
The characteristic parameter data of the combustible gas flow and explosion process include but are not limited to: the maximum explosion pressure and the pressure rising rate of the combustible gas, the combustion temperature of the combustible gas, the velocity field distribution of the combustible gas, the flame propagation speed of the combustible gas and the microstructure of a flame front. The maximum explosion pressure and the pressure rising rate of the combustible gas are collected through a pressure sensor; testing the velocity field distribution and the flame propagation velocity of the gas in the gas flow combustion pipe pipeline through a particle image velocimetry unit; and observing and researching the microstructure of the flame front surface of the combustible gas in the burning explosion process by using a laser-induced fluorescence imaging unit. And igniting the mixed gas to be detected in the pipeline and triggering the acquisition of explosion characteristic parameter data.
In addition, after the combustible gas enters the gas flow combustion tube 16, the particle image speed measurement unit 19 can directly record the flow field information of the gas without ignition, so that the experimental simulation of the continuous flow process of the combustible gas is realized.
After the experiment test is finished, the gas inlet pipeline 1 is closed, and the nitrogen is used for purging after the gas in the testing device is emptied.
The following specific examples are set forth below:
example 1
The combustible gas uses hydrogen, the gas to be detected is a mixture of hydrogen and air, the initial temperature is set to be 40 ℃, the initial pressure is set to be 0.2MPa, the inlet diameter of the gas inlet nozzle is 5mm, the length of a pipeline of the gas flow combustion pipe is 2m, and the pipe diameter is 200 mm. The method comprises the steps of firstly purging the whole device by using nitrogen, then closing all valves, vacuumizing the device, and determining that the system is good in air tightness when the pressure change in a pipeline is less than or equal to 1KPa within 1 minute after vacuumizing is finished. The gas flow combustion tube is filled with air and is returned to normal pressure.
Setting the temperature of an electric heater to be 40 ℃, controlling the air inlet pressure to be 0.2MPa through a pressure regulating valve, starting an ignition electrode after the gas in the pipeline flows stably, simultaneously triggering data acquisition, observing the gas combustion condition through a window on a gas flow combustion pipe, automatically recording the pressure, the pressure rise rate and the temperature change in the pipeline by a data acquisition card of each sensor, triggering a particle image speed measurement unit and a laser induced fluorescence imaging unit after the combustion is stable, acquiring the velocity field distribution data of the gas flow process in the pipeline, and shooting and recording the microstructure picture of flame combustion. After the experimental record is finished, the air inlet pipeline is closed, and the whole device is purged by nitrogen.
Example 2
The combustible gas is methane, the gas to be detected is a mixture of methane and air, the initial temperature is 100 ℃, the initial pressure is 0.5MPa, the inlet diameter of the gas inlet nozzle is 5mm, the length of a pipeline of the gas flow combustion pipe is 10m, and the pipe diameter is 500 mm. The method comprises the steps of firstly purging the whole device by using nitrogen, then closing all valves, vacuumizing the device, and determining that the system is good in air tightness when the pressure change in a pipeline is less than or equal to 1KPa within 1 minute after vacuumizing is finished. The gas flow combustion tube is filled with air and is returned to normal pressure.
Setting the temperature of an electric heater to be 100 ℃, controlling the air inlet pressure to be 0.5MPa through a pressure regulating valve, starting an ignition electrode after the gas in the pipeline flows stably, simultaneously triggering data acquisition, observing the gas combustion condition through a window on a gas flow combustion pipe, automatically recording the pressure, the pressure rise rate and the temperature change in the pipeline by a data acquisition card of each sensor, triggering a particle image speed measurement unit and a laser induced fluorescence imaging unit after the combustion is stable, acquiring the velocity field distribution data of the gas flow process in the pipeline, and shooting and recording the microstructure picture of flame combustion. After the experimental record is finished, the air inlet pipeline is closed, and the whole device is purged by nitrogen.
Example 3
The combustible gas uses hydrogen, the gas to be detected is a mixture of hydrogen and air, the initial temperature is 150 ℃, the initial pressure is 0.1MPa, the inlet diameter of the gas inlet nozzle is 100mm, the length of a pipeline of the gas flow combustion pipe is 1m, and the pipe diameter is 500 mm. The method comprises the steps of firstly purging the whole device by using nitrogen, then closing all valves, vacuumizing the device, and determining that the system is good in air tightness when the pressure change in a pipeline is less than or equal to 1KPa within 1 minute after vacuumizing is finished. The gas flow combustion tube is filled with air and is returned to normal pressure.
Setting the temperature of an electric heater to be 150 ℃, controlling the air inlet pressure to be 0.1MPa through a pressure regulating valve, starting an ignition electrode after the gas in a pipeline flows stably, simultaneously triggering data acquisition, observing the gas combustion condition through a window on the pipeline of a gas flow combustion pipe, automatically recording the pressure, the pressure rise rate and the temperature change in the pipeline through a data acquisition card of each sensor, triggering a particle image speed measurement unit and a laser induced fluorescence imaging unit after the combustion is stable, acquiring the velocity field distribution data of the gas flow process in the pipeline, and shooting and recording the microstructure picture of flame combustion. After the experimental record is finished, the air inlet pipeline is closed, and the whole device is purged by nitrogen.
Example 4
The combustible gas uses hydrogen, the gas to be detected is a mixture of hydrogen and air, the initial temperature is 200 ℃, the initial pressure is 1.0MPa, the inlet diameter of the gas inlet nozzle is 20mm, the length of a pipeline of the gas flow combustion pipe is 5m, and the pipe diameter is 100 mm. The method comprises the steps of firstly purging the whole device by using nitrogen, then closing all valves, vacuumizing the device, and determining that the system is good in air tightness when the pressure change in a pipeline is less than or equal to 1KPa within 1 minute after vacuumizing is finished. The gas flow combustion tube is filled with air and is returned to normal pressure.
Setting the temperature of an electric heater to be 200 ℃, controlling the air inlet pressure to be 1.0MPa through a pressure regulating valve, starting an ignition electrode after the gas in a pipeline flows stably, simultaneously triggering data acquisition, observing the gas combustion condition through a window on the pipeline of a gas flow combustion pipe, automatically recording the pressure, the pressure rise rate and the temperature change in the pipeline through a data acquisition card of each sensor, triggering a particle image speed measurement unit and a laser induced fluorescence imaging unit after the combustion is stable, acquiring the velocity field distribution data of the gas flow process in the pipeline, and shooting and recording the microstructure picture of flame combustion. After the experimental record is finished, the air inlet pipeline is closed, and the whole device is purged by nitrogen.
Example 5
The combustible gas uses hydrogen, the gas to be detected is a mixture of hydrogen and air, the initial temperature is 20 ℃, the initial pressure is 5.0MPa, the inlet diameter of the gas inlet nozzle is 50mm, the length of a pipeline of the gas flow combustion pipe is 8m, and the pipe diameter is 200 mm. The method comprises the steps of firstly purging the whole device by using nitrogen, then closing all valves, vacuumizing the device, and determining that the system is good in air tightness when the pressure change in a pipeline is less than or equal to 1KPa within 1 minute after vacuumizing is finished. The gas flow combustion tube is filled with air and is returned to normal pressure.
Setting the temperature of the electric heater to be 20 ℃, controlling the air inlet pressure to be 5.0MPa through the pressure regulating valve, directly triggering the particle image speed measuring unit without igniting after the gas in the pipeline flows stably, and collecting the velocity field distribution data of the gas flowing process in the pipeline. After the experimental record is finished, the air inlet pipeline is closed, and the whole device is purged by nitrogen.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments shall fall within the scope of the present invention.
Claims (15)
1. The utility model provides a combustible gas flows and explodes process characteristic parameter testing arrangement which characterized in that includes:
the hollow structure of the flowing combustion pipe provides a space for flowing and burning the combustible gas, and the flowing combustion pipe is filled with normal-pressure air before testing; an ignition electrode is inserted in the air inlet side of the tube body of the flow combustion tube, and an opening is formed at one end of the flow combustion tube, which is far away from the air inlet side of the tube body;
the particle image velocimetry unit is used for measuring the flow field characteristic parameters of the combustible gas after combustion;
and the laser-induced fluorescence imaging unit is used for synchronously measuring the flame characteristic parameters of the combusted flowing combustible gas.
2. The device for testing the characteristic parameters of the combustible gas flow and explosion process according to claim 1, further comprising:
an air intake nozzle that injects the combustible gas from an air intake conduit into the flow combustor.
3. The device for testing the characteristic parameters of the combustible gas flow and explosion process according to claim 2, further comprising:
the pressure sensor is arranged in a measuring hole on the surface of the flowing combustion pipe body and used for detecting the pressure change of combustible gas in the flowing combustion pipe after combustion and sending data to the control unit;
the temperature sensor is arranged in a measuring hole on the surface of the flowing combustion pipe body and used for detecting the temperature change of the combustible gas in the flowing combustion pipe after combustion and sending data to the control unit;
and the flame sensor is arranged in the measuring hole on the surface of the flowing combustion pipe body and used for detecting photoelectric data of combustible gas in the flowing combustion pipe after combustion and sending the data to the control unit.
4. The device for testing the characteristic parameters of the combustible gas flow and explosion process as claimed in claim 2, wherein a flame arrester is arranged at the front end of the gas inlet nozzle and is used for preventing the combustible gas from being ignited in advance or preventing flames from being connected back to an upstream pipeline.
5. The device for testing the characteristic parameters of the flowing and exploding process of combustible gas as claimed in claim 1, wherein the flowing combustion tube is wound with a glass fiber electric heating tape outside, and the electric heating tape is wrapped by heat insulation cotton.
6. The apparatus for testing the characteristic parameters of the flowing and exploding process of combustible gas as claimed in claim 1, wherein the tube body of the flowing combustion tube is provided with a transparent glass window.
7. The combustible gas flow and detonation process characteristic parameter testing device according to claim 6, wherein the synchronous measurement specifically is: focusing the detection planes of the particle image speed measurement unit and the laser-induced fluorescence imaging unit to the same measurement area, synchronously adjusting the laser pulse frequency, the camera shutter width and the detection time interval parameters of the particle image speed measurement unit and the laser-induced fluorescence imaging unit, and acquiring data through the transparent glass window.
8. The combustible gas flow and explosion process characteristic parameter testing device according to claim 1, wherein the flow field characteristic parameters include: velocity field distribution information, vortex structure information, shock wave information, and/or shear layer information.
9. The apparatus for testing the characteristic parameters of the combustible gas flow and explosion process according to claim 1, wherein the flame characteristic parameters comprise flame form information and/or flame front structure information of a flame propagation process.
10. The combustible gas flow and explosion process characteristic parameter testing device according to claim 1, wherein a nitrogen purging pipeline is arranged at the position of the air inlet pipeline.
11. A method for testing characteristic parameters of a combustible gas flowing and blasting process is characterized by comprising the following steps:
filling air in the flowing combustion pipe and keeping the air pressure in the pipe at normal pressure;
adjusting the combustible gas from an air inlet pipeline to the temperature and pressure set by the test working condition, wherein the combustible gas enters the flowing combustion pipe and is mixed with the air;
the combustible gas is combusted under the action of an ignition electrode and spreads in the flowing combustion tube;
and synchronously measuring the flow field characteristic parameters and the flame characteristic parameters after the combustible gas is combusted.
12. The method for testing the characteristic parameters of the combustible gas flow and explosion process according to claim 11, wherein the temperature range set by the test working condition is between room temperature and 500 ℃; the pressure ranges from 0.1 to 20 MPa.
13. The method for testing the characteristic parameters of the combustible gas flow and explosion process according to claim 11, wherein the synchronous measurement specifically comprises: focusing the detection planes of the particle image velocimetry unit and the laser-induced fluorescence imaging unit to the same measurement area, and synchronously adjusting the laser pulse frequency, the camera shutter width and the detection time interval parameters of the particle image velocimetry unit and the laser-induced fluorescence imaging unit.
14. The method for testing the characteristic parameters of the combustible gas flow and explosion process according to claim 11, further comprising: and detecting pressure change data, temperature change data and/or photoelectric data of the combustible gas after combustion in the flowing combustion pipe, and sending the data to a control unit.
15. The method for testing the characteristic parameters of the flowing and the blasting of the combustible gas as recited in claim 11, wherein nitrogen purging is performed on the whole pipeline of the testing device before the testing, residual gas in the testing device is removed, and the airtightness of the testing device is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010329103.8A CN113552169A (en) | 2020-04-23 | 2020-04-23 | Device and method for testing characteristic parameters of combustible gas flowing and blasting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010329103.8A CN113552169A (en) | 2020-04-23 | 2020-04-23 | Device and method for testing characteristic parameters of combustible gas flowing and blasting process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113552169A true CN113552169A (en) | 2021-10-26 |
Family
ID=78101249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010329103.8A Pending CN113552169A (en) | 2020-04-23 | 2020-04-23 | Device and method for testing characteristic parameters of combustible gas flowing and blasting process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113552169A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413693A (en) * | 2022-01-24 | 2022-04-29 | 安徽理工大学 | Gas detonation drive ultra-high speed launching test system |
| CN114414626A (en) * | 2022-01-21 | 2022-04-29 | 安徽理工大学 | Combustible gas detonation drive generator for high-speed loading |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003166962A (en) * | 2001-12-03 | 2003-06-13 | Kaneko Sangyo Kk | Combustion-testing apparatus and method of combustible gas in gas piping having breather valve |
| WO2008028453A1 (en) * | 2006-09-05 | 2008-03-13 | Technische Universität Bergakademie Freiberg | Method of measuring calorific values of combustible gases and a calorific value meter |
| US20120308940A1 (en) * | 2011-06-02 | 2012-12-06 | Caso Vincent J | Natural gas purge burner and associated systems and methods |
| CN103454308A (en) * | 2013-09-23 | 2013-12-18 | 中国科学技术大学 | Apparatus for testing flame propagation and flame suppression in flammable gas and air premixed gas explosion process |
| CN203432964U (en) * | 2013-09-06 | 2014-02-12 | 中国科学技术大学 | Test device for high-pressure combustible gas leakage spontaneous combustion and shock wave induced ignition |
| CN103759775A (en) * | 2014-01-23 | 2014-04-30 | 西北工业大学 | Experimental system for measuring propagation speed of laminar premixed flame under high pressure |
| CN107402232A (en) * | 2017-08-11 | 2017-11-28 | 中北大学 | The dynamic blast absolute rating assay method of fuel gas |
| CN209182323U (en) * | 2018-11-30 | 2019-07-30 | 中国石油大学(华东) | Flammable gas explosion simulation and the datonation-inhibition experiment porch of water mist under a kind of high/low temperature |
-
2020
- 2020-04-23 CN CN202010329103.8A patent/CN113552169A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003166962A (en) * | 2001-12-03 | 2003-06-13 | Kaneko Sangyo Kk | Combustion-testing apparatus and method of combustible gas in gas piping having breather valve |
| WO2008028453A1 (en) * | 2006-09-05 | 2008-03-13 | Technische Universität Bergakademie Freiberg | Method of measuring calorific values of combustible gases and a calorific value meter |
| US20120308940A1 (en) * | 2011-06-02 | 2012-12-06 | Caso Vincent J | Natural gas purge burner and associated systems and methods |
| CN203432964U (en) * | 2013-09-06 | 2014-02-12 | 中国科学技术大学 | Test device for high-pressure combustible gas leakage spontaneous combustion and shock wave induced ignition |
| CN103454308A (en) * | 2013-09-23 | 2013-12-18 | 中国科学技术大学 | Apparatus for testing flame propagation and flame suppression in flammable gas and air premixed gas explosion process |
| CN103759775A (en) * | 2014-01-23 | 2014-04-30 | 西北工业大学 | Experimental system for measuring propagation speed of laminar premixed flame under high pressure |
| CN107402232A (en) * | 2017-08-11 | 2017-11-28 | 中北大学 | The dynamic blast absolute rating assay method of fuel gas |
| CN209182323U (en) * | 2018-11-30 | 2019-07-30 | 中国石油大学(华东) | Flammable gas explosion simulation and the datonation-inhibition experiment porch of water mist under a kind of high/low temperature |
Non-Patent Citations (2)
| Title |
|---|
| 程浩力等;: "管道燃气爆炸特性实验研究", 中国安全生产科学技术, vol. 6, no. 04, 15 August 2010 (2010-08-15), pages 23 - 27 * |
| 谭迎新;霍雨江;焦国太;韩意;: "可燃气体动态爆炸极限测试装置设计", 消防科学与技术, vol. 37, no. 09, 15 September 2018 (2018-09-15), pages 1235 - 1237 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414626A (en) * | 2022-01-21 | 2022-04-29 | 安徽理工大学 | Combustible gas detonation drive generator for high-speed loading |
| CN114414626B (en) * | 2022-01-21 | 2023-11-03 | 安徽理工大学 | Combustible gas detonation drive generator for high-speed loading |
| CN114413693A (en) * | 2022-01-24 | 2022-04-29 | 安徽理工大学 | Gas detonation drive ultra-high speed launching test system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103454396B (en) | Test device for high-pressure combustible gas leakage spontaneous combustion and shock wave induction ignition | |
| CN102937603B (en) | High Temperature High Pressure explosion limits tester, measures method and the application of explosion limits | |
| CN203432964U (en) | Test device for high-pressure combustible gas leakage spontaneous combustion and shock wave induced ignition | |
| CN113552169A (en) | Device and method for testing characteristic parameters of combustible gas flowing and blasting process | |
| Li et al. | Visualization of spontaneous ignition and flame behavior in tubes with and without obstacles during the high-pressure hydrogen release | |
| CN113156045A (en) | Visual hydrogen explosion ripple spark arrester back-fire relief capability test and detection protector | |
| CN114441593B (en) | Hydrogen-doped natural gas pipeline leakage ignition combustion test device | |
| Pan et al. | Effects of top vent locations and gasoline volumes on vented gasoline vapor explosion in closed small-scale vessel | |
| CN114755266B (en) | Experimental device for simulating gas-coal dust explosion in underground tunnel of coal mine | |
| CN102323390A (en) | Constant volume premixed combustion testing apparatus | |
| CN106290703A (en) | Coal thermal insulation spontaneous combustion experimental provision and method | |
| CN108318254A (en) | It is a kind of to be used to measure the device and method that sound wave influences Free propagation flame | |
| CN207473007U (en) | High-pressure combustible gas pipeline leakage static monitoring and accurate energy ignition device | |
| CN209387568U (en) | It is a kind of with cigarette is close and the flame retardant cable horizontal firing test device of temperature-monitoring function | |
| CN220251795U (en) | Explosion venting experiment combination device for combustible gas pipeline | |
| CN109752409A (en) | A kind of flammable gas explosion propagation law simulation test device | |
| CN205748959U (en) | A kind of assay device for pipeline explosion arrestment spark arrester performance test | |
| CN112345588B (en) | Device and method for testing explosion-proof performance of positive pressure environment explosion protection product | |
| CN206431077U (en) | A kind of large scale pipeline powder coal weak ignition explosive test system | |
| CN113552168A (en) | Device and method for testing characteristic parameters of turbulence and explosion process of premixed combustible gas | |
| CN112798291A (en) | Hydrogen leakage simulation system and method | |
| CN111175434A (en) | Experimental device for combustible gas combustion characteristic integrated test | |
| CN211455070U (en) | Explosion-proof experiment system | |
| CN106568888A (en) | An experiment apparatus having a pressure stabilizing function and used for measuring the laminar flow burning rate of liquid fuel and a method thereof | |
| US20150335925A1 (en) | Systems and methods for reducing an overpressure caused by a vapor cloud explosion |
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 |