CN107356632A - The experimental provision that externally-applied magnetic field influences on premixed gas explosive characteristic - Google Patents
The experimental provision that externally-applied magnetic field influences on premixed gas explosive characteristic Download PDFInfo
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- CN107356632A CN107356632A CN201710714337.2A CN201710714337A CN107356632A CN 107356632 A CN107356632 A CN 107356632A CN 201710714337 A CN201710714337 A CN 201710714337A CN 107356632 A CN107356632 A CN 107356632A
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- premixed gas
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- 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
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Abstract
The invention discloses the experimental provision that a kind of externally-applied magnetic field influences on premixed gas explosive characteristic, including adjustable additional electromagnetic field, nonmetallic transparent material premixed gas blast pipe-line system, air distribution system, transient state blast pressure system, high speed video system, high-energy ignition system, using all-transparent visualization and compatible transient state blast pressure acquisition system, the Synchronization Analysis of explosive flame propagation characteristic and transient state blast pressure feature can be realized, draw the flame propagation velocity that block blast-proof materials explodes to premixed gas, flame intensity, the affecting laws of the blast such as transient state blast pressure and rate of pressure rise, the further genralrlization of block blast-proof materials is contributed to use.
Description
Technical field
The present invention relates to a kind of gas combustion explosion scientific research and experiment test technology, more particularly to a kind of externally-applied magnetic field
The experimental provision influenceed on premixed gas explosive characteristic.
Background technology
With the high speed development of national economy and the adjustment of energy resource structure, inflammable and explosive chemicals and imflammable gas obtain
Extensive use, is industrial development essential raw materials for production and fuel energy, and future will be further lifted with the stone that liquefies
Industrial production, the status of domestic energy structure based on oil gas and natural gas.But inflammable and explosive chemicals and imflammable gas
During exploitation, conveying, storage, processing and use or because leakage causes gas burst accident to happen occasionally, often
Because flame caused by combustion explosion and shock wave easily caused by nearby device and structures destruction, cause the injures and deaths and warp of personnel
Ji loss, drastically influence the relevant industries such as national product, energy extraction, communications and transportation, petrochemical industry.Therefore to flammable gas
Study on influencing factors is carried out in body blast and injury survey research is very necessary.
In existing explosive characteristic research experiment device, mainly based on the test of transient state blast pressure, coordinate small area
Observation window, or all-transparent visualization blast pipeline, no pressure acquisition system, both experimental provisions can not all realize premix
The blast such as explosive flame spread speed, flame intensity, transient state blast pressure and rate of pressure rise of gas burst overall process is special
The Synchronization Analysis research of sign.
Gas burst is a sufficiently complex and extremely quick physical-chemical reaction process, can be produced perhaps in blast process
More intermediate products and moment product, such as molecule, free radical, ion, electronics, and in magnetic field, chemical reaction system and anti-
Answer the spin of the unpaired electron of thing can be affected by magnetic fields, so that the entropy of reaction system changes, and then influenceization
Learn reaction process.So magnetic field can have an impact to these intermediate products and moment product course of reaction, so that magnetic field is quick-fried to gas
Fried and its propagation can have an impact.
Domestic and foreign scholars are studied inflammable harmful influence and gas explosion propagation law, dynamic characteristics and influence factor etc. at present
It is more deep, but less, the related experimental provision of the achievement in research in terms of gas explosion and its propagation is influenceed for magnetic field
Less, this also constrains the research that magnetic field influences on premixed gas explosive characteristic in turn.
The content of the invention
It is an object of the invention to provide the experimental provision that a kind of externally-applied magnetic field influences on premixed gas explosive characteristic.
The purpose of the present invention is achieved through the following technical solutions：
The experimental provision that the externally-applied magnetic field of the present invention influences on premixed gas explosive characteristic, including adjustable additional electromagnetic field,
Nonmetallic transparent material premixed gas blast pipe-line system, air distribution system, transient state blast pressure system, high speed video system, height
Can ignition system；
The adjustable additional electromagnetic field includes electric voltage regulator and three groups of magnetic poles, and three groups of magnetic poles connect in parallel
Enter the electric voltage regulator；
The nonmetallic transparent material premixed gas blast pipe-line system is exploded including nonmetallic transparent material premixed gas
Pipeline, transient pressure sensor, pneumatic operated valve, flange, transient pressure sensor described in some groups are installed in a manner of symmetrical up and down
On the nonmetallic transparent material premixed gas blast pipeline, described nonmetallic transparent material premixed gas blast pipeline one end
The reserved connection igniter head of closed flange interface, the nonmetallic compatible peace of the transparent material premixed gas blast pipeline other end
Filling dismantled and assembled pneumatic operated valve controls closed flange and the closed flange of fastening-type, pneumatic operated valve to be connected by pipeline with pneumatic valve controller,
The nonmetallic transparent material premixed gas blast pipeline is provided with burst disk；
The air distribution system includes gas cylinder, gas flowmeter, gas valve；
The high speed video system includes high-speed camera, acquisition software and tripod；
The high-energy ignition system includes high-energy ignition platform and igniter head, and the high-energy ignition platform passes through cable and the point
Duration and degree of heating connects.
As seen from the above technical solution provided by the invention, externally-applied magnetic field provided in an embodiment of the present invention is to premixing gas
The experimental provision that body explosive characteristic influences, using all-transparent visualization and compatible transient state blast pressure acquisition system, it can realize
Explosive flame propagation characteristic and the Synchronization Analysis of transient state blast pressure feature, draw what block blast-proof materials exploded to premixed gas
The affecting laws of the blasts such as flame propagation velocity, flame intensity, transient state blast pressure and rate of pressure rise, contribute to barrier anti-
The further genralrlization of quick-fried material uses, and has very important economic implications and practical value.
Brief description of the drawings
Fig. 1 is the structure for the experimental provision that externally-applied magnetic field provided in an embodiment of the present invention influences on premixed gas explosive characteristic
Schematic diagram.
In figure：
The nonmetallic transparent material premixed gas blast pipeline 2- transient pressure sensor 3- magnetic pole 4- pneumatic operated valves 5- of 1-
Dismantled and assembled pneumatic operated valve controls closed flange 6- pneumatic valve controllers 7- electric voltage regulators 8- gas cylinder 9- spinner flowmeters 10-
Triple valve 11- circulating pump 12- air compressor 13- igniter head 14- high-energy ignition platform 15- vacuum meter 16- check valves
17- time-delay relay 18- transient pressures gather main frame 19- data acquisition computer 20- high-speed cameras.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
The experimental provision that the externally-applied magnetic field of the present invention influences on premixed gas explosive characteristic, its preferable embodiment
It is：
It is quick-fried including adjustable additional electromagnetic field, nonmetallic transparent material premixed gas blast pipe-line system, air distribution system, transient state
Fried pressure system, high speed video system, high-energy ignition system；
The adjustable additional electromagnetic field includes electric voltage regulator and three groups of magnetic poles, and three groups of magnetic poles connect in parallel
Enter the electric voltage regulator；
The nonmetallic transparent material premixed gas blast pipe-line system is exploded including nonmetallic transparent material premixed gas
Pipeline, transient pressure sensor, pneumatic operated valve, flange, transient pressure sensor described in some groups are installed in a manner of symmetrical up and down
On the nonmetallic transparent material premixed gas blast pipeline, described nonmetallic transparent material premixed gas blast pipeline one end
The reserved connection igniter head of closed flange interface, the nonmetallic compatible peace of the transparent material premixed gas blast pipeline other end
Filling dismantled and assembled pneumatic operated valve controls closed flange and the closed flange of fastening-type, pneumatic operated valve to be connected by pipeline with pneumatic valve controller,
The nonmetallic transparent material premixed gas blast pipeline is provided with burst disk；
The air distribution system includes gas cylinder, gas flowmeter, gas valve；
The high speed video system includes high-speed camera, acquisition software and tripod；
The high-energy ignition system includes high-energy ignition platform and igniter head, and the high-energy ignition platform passes through cable and the point
Duration and degree of heating connects.
The long 1000mm of the nonmetallic transparent material premixed gas blast pipeline, external diameter 104mm, internal diameter 100mm, wall thickness
2mm, pressure-resistant 2MPa, the burst disk critical pressure are 0.8MPa.
3rd, the experimental provision that externally-applied magnetic field according to claim 1 influences on premixed gas explosive characteristic, its feature
It is, the size of the magnetic field intensity of the adjustable additional electromagnetic field realizes stepless-adjustment by the step-less adjustment of electric voltage regulator
Section.
The ignition switch of the high-energy ignition platform is connected with the start button of the electric voltage regulator by delayed relay.
The adjustment parameter of the magnetic field intensity of the adjustable additional electromagnetic field is：Voltage adjustable extent is 0~450V, magnetic field
Adjustable extent be 0~300T.
In the horizontal direction, the distance of transient pressure sensor described in two adjacent groups is more than 1 centimetre.
The experimental provision that the externally-applied magnetic field of the present invention influences on premixed gas explosive characteristic, magnetic field intensity can be with stepless-adjustment
Save, be versatile, repeatable experiment.
The present invention is realized outer by the way that some groups of magnetic poles are erected at nonmetallic transparent material premixed gas blast pipeline both sides
Add covering of the magnetic field to pipeline, by adjusting the size of magnetic field intensity, realize to magnetic field intensity and premixed gas explosive characteristic
The research of Coupling Rule, by Pipe installing transient pressure sensor, and high-speed photography system is combined, realized to premixed gas
The research of the comprehensive explosive characteristic of transient pressure, rate of pressure rise, explosive flame spread speed and the flame intensity etc. of exploding, passes through
The closed flange and the closed flange-interface of fastening-type of compatible installation pneumatic operated valve control simultaneously, is realized to opening explosion test with remaining silent
The research of explosion test, sealing flange and the nonmetallic transparent material premixed gas blast nonmetallic transparent material premixed gas of pipeline
Sealing gasket is installed, burst disk is hard sealing with burst disk interface, and some groups of magnetic poles pass through in parallel between blast pipeline
Cable is connected with electric voltage regulator, and pumped vacuum systems, air distribution system are quick-fried by pipeline and nonmetallic transparent material premixed gas
Bombing road connects, and electric voltage regulator passes through cable connection with high-energy ignition platform.
Specific embodiment：
As shown in figure 1, the central idea of the present invention is by developing an externally-applied magnetic field to premixed gas explosive characteristic shadow
Loud experimental provision, the electric voltage regulator carried by device can the electrodeless additional electromagnetism for adjusting magnetic field intensity to realize with magnetic core
, by the nonmetallic transparent material premixed gas blast pipeline of nonmetallic transparent material premixed gas blast pipeline, and in pipeline
Transient pressure sensor is installed, is combined with high-speed photography system, is realized to raising speed in premixed gas blast transient pressure, pressure
The research of the comprehensive explosive characteristic such as rate, explosive flame spread speed and flame intensity, by pacifying in electric voltage regulator starting switch
Dress time-delay relay is connected with high-energy ignition platform ignition switch, realizes igniting with applying the overall-in-one control schema in magnetic field.
The experimental provision that externally-applied magnetic field of the present invention influences on premixed gas explosive characteristic, is included but are not limited to：
(1) block blast-proof materials is loaded.Blast pipeline internal resistance is 25kg/m every explosion-proof lamp packed density3, filling rate is
95%, the quality for filling block blast-proof materials is 187g, and lower end igniter head end leaves blank 5%, and its complementary space is filled full.(opening
Open up under externally-applied magnetic field effect, when block blast-proof materials influences to test on premixed gas explosive characteristic)
(2) airtight test.Blast pipeline is vacuumized 5 minutes, vacuum valve is closed and places 3 minutes, if 3 minutes
Afterwards, vacuum list index does not turn round, shows that device air-tightness is good, if cursor backward, shows with the presence of gas leakage place, to pipeline
Air is inside filled with, Gas leak position is found out and takes containment measures, until confirming that whole device air-tightness is intact, can be carried out
Experiment.
(3) vacuumize.Check that confirmation all valves of device are closed before starting vavuum pump, start vavuum pump, beat
Vacuum valve is driven, when vacuum meter shows that reaching certain vacuum spends, closes vacuum valve.
(4) distribution is with uniformly mixing.According in the volume of gas burst pipeline, and required premixed gas fuel gas it is dense
The volume for needing to inject fuel gas is calculated in degree.After the completion of distribution, start circulating pump, make premixed gas body in blast pipeline
Interior circulation more than 5 minutes, to complete the uniform mixing of fuel gas-air.
(5) high-speed photography system and pressure acquisition system are started.High-speed motion picture camera is with certain carry out high-speed capture；Below
Frame rate can be 2000 frames/second exemplified by the operating parameter of one group of face, and the sample frequency of pressure acquisition system is 15,000 times/second.
(6) start the starting switch of electric voltage regulator and trigger high-speed camera simultaneously.
(7) data process＆analysis.After experiment terminates, to explosive flame image and the transient state blast pressure number collected
According to Treatment Analysis is carried out, to obtain explosive flame spread speed, transient state detonation peak pressure and rate of pressure rise.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (6)
1. the experimental provision that a kind of externally-applied magnetic field influences on premixed gas explosive characteristic, it is characterised in that including adjustable outer power-up
Magnetic field, nonmetallic transparent material premixed gas blast pipe-line system, air distribution system, transient state blast pressure system, high-speed camera system
System, high-energy ignition system；
The adjustable additional electromagnetic field includes electric voltage regulator and three groups of magnetic poles, and three groups of magnetic poles access institute in parallel
State electric voltage regulator；
The nonmetallic transparent material premixed gas blast pipe-line system include nonmetallic transparent material premixed gas blast pipeline,
Transient pressure sensor, pneumatic operated valve, flange, transient pressure sensor described in some groups are arranged on described in a manner of symmetrical up and down
On nonmetallic transparent material premixed gas blast pipeline, described nonmetallic transparent material premixed gas blast pipeline one end it is closed
The interface of the reserved connection igniter head of flange, the nonmetallic compatible installation of the transparent material premixed gas blast pipeline other end are removable
Dress pneumatic operated valve controls closed flange and the closed flange of fastening-type, pneumatic operated valve to be connected by pipeline with pneumatic valve controller, described non-
Metallic transparent material premixed gas blast pipeline is provided with burst disk；
The air distribution system includes gas cylinder, gas flowmeter, gas valve；
The high speed video system includes high-speed camera, acquisition software and tripod；
The high-energy ignition system includes high-energy ignition platform and igniter head, and the high-energy ignition platform passes through cable and described igniter head
Connection.
2. the experimental provision that externally-applied magnetic field according to claim 1 influences on premixed gas explosive characteristic, it is characterised in that
It is the long 1000mm of the nonmetallic transparent material premixed gas blast pipeline, external diameter 104mm, internal diameter 100mm, wall thickness 2mm, pressure-resistant
2MPa, the burst disk critical pressure are 0.8MPa.
3. the experimental provision that externally-applied magnetic field according to claim 1 influences on premixed gas explosive characteristic, it is characterised in that
The size of the magnetic field intensity of the adjustable additional electromagnetic field realizes step-less adjustment by the step-less adjustment of electric voltage regulator.
4. the experimental provision that externally-applied magnetic field according to claim 3 influences on premixed gas explosive characteristic, it is characterised in that
The ignition switch of the high-energy ignition platform is connected with the start button of the electric voltage regulator by delayed relay.
5. the experimental provision that externally-applied magnetic field according to claim 3 influences on premixed gas explosive characteristic, it is characterised in that
The adjustment parameter of the magnetic field intensity of the adjustable additional electromagnetic field is：Voltage adjustable extent is 0~450V, and magnetic field can adjust
Scope is 0~300T.
6. the experimental provision that externally-applied magnetic field according to claim 1 influences on premixed gas explosive characteristic, it is characterised in that
In the horizontal direction, the distance of transient pressure sensor described in two adjacent groups is more than 1 centimetre.
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| CN201710714337.2A CN107356632A (en) | 2017-08-18 | 2017-08-18 | The experimental provision that externally-applied magnetic field influences on premixed gas explosive characteristic |
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| CN109283222A (en) * | 2018-11-27 | 2019-01-29 | 北京石油化工学院 | Metal material inhibits the method and experimental provision of flammable explosive gas explosion |
| CN111610121A (en) * | 2020-05-28 | 2020-09-01 | 北京理工大学 | Method for testing performance of explosive in pulsed magnetic field |
| CN112881465A (en) * | 2021-01-13 | 2021-06-01 | 北京理工大学 | Multi-initial-state fuel transient reaction flow field parameter testing system |
| CN113552170A (en) * | 2021-08-12 | 2021-10-26 | 北京石油化工学院 | Device and method for inhibiting combustible gas explosion by using magnetic field |
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