CN102608161B - Method for testing critical energy of detonation formed by direct initiation - Google Patents
Method for testing critical energy of detonation formed by direct initiation Download PDFInfo
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- CN102608161B CN102608161B CN 201210058653 CN201210058653A CN102608161B CN 102608161 B CN102608161 B CN 102608161B CN 201210058653 CN201210058653 CN 201210058653 CN 201210058653 A CN201210058653 A CN 201210058653A CN 102608161 B CN102608161 B CN 102608161B
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Abstract
The invention belongs to the technical field of inflammable gas accident prevention, and particularly relates to inflammable gas testing methods. The technical scheme includes that a system for testing critical energy of detonation formed by direct initiation comprises an initiation device (1), an oscilloscope and an ignition circuit, wherein the oscilloscope is connected with output of a pressure sensor (5) of the initiation device, and the ignition circuit is connected to the initiation device (1) through a triggering switch. The initiation device is applicable to measurement of initial pressure ranging from 1kPa to 20atm so as to be wide in testing pressure range, and is applicable to measurement of the critical energy formed by direct initiation of mixed gases of all gaseous fuel and oxygen or air. Detonation sensitiveness of various substances can be judged by measuring the critical energy of detonation formed by direct initiation of various inflammable mixed gases, so that a dangerous source can be controlled, and damage of detonation to life safety and property loss is avoided or reduced. The system is simple in structure, low in cost, easy in operation and accurate in measurement result.
Description
Technical field
The invention belongs to inflammable gas accident prevention technical field, particularly to the method for testing of inflammable gas.
Background technology
Relate to a large amount of flammable explosive gas in the modern industry production run inevitably, in case combustible and air mixed also reach the finite concentration scope, under certain ignition energy effect, can burn, explode, even the stronger detonation of destructive power, cause any property loss within a large range and casualties.By measurement, can improve risk assessment ability, thereby effectively avoid or reduce the harm of detonation personnel and property to the burning mixture detonation hazard to direct formation detonation transition energy.1993, the Zhang Jinglin invention designed the flammable gas explosion characteristic test device, and this device can be tested the explosion limits and the minimum ignition energy of inflammable gas.2011, Jiang Juncheng invented flammable gas explosion limit test system under a kind of nonstandard state, is used to measure the explosion limits of inflammable gas under the non-standard condition under High Temperature High Pressure or the normal temperature high voltage.Though existing technology to the blast characteristics of inflammable gas and the measurement comparative maturity of explosion limits, also is not used in the test macro of direct initiation transition energy at present.
Summary of the invention
The objective of the invention is: provide a kind of direct initiation to form the transition energy method of testing of detonation, utilize the high-voltage spark igniting, based on the computing method of high-tension igniton effective energy, be applicable to that the inflammable gas of different initial pressures (particularly under the high pressure) directly forms the device of detonation transition energy test.
Technical scheme of the present invention is: a kind of direct initiation forms the transition energy method of testing of detonation, it uses a kind of direct initiation to form the transition energy test macro of detonation, the transition energy test macro that described direct initiation forms detonation comprises: priming device, oscillograph and firing circuit; Wherein, described priming device is a spherical container, and its top is provided with fire rod, the bottom is provided with the heating tape, the one side connects control panel, and described control panel is provided with the air inlet pipeline that communicates with described priming device, and can be by the monitoring of the electron pressure table on described control panel air inflow; Opposite side at described priming device is provided with pressure transducer; Described oscillograph connects the output of described pressure transducer; Described firing circuit comprises: high-voltage power supply, and the electric capacity in parallel with described high-voltage power supply, described high-voltage power supply is connected to described fire rod by a trigger switch;
This direct initiation forms the transition energy method of testing of detonation, and it may further comprise the steps:
A. use vacuum pump vacuum pumping in the described priming device, pressure is at least less than 80Pa;
B. slowly add mixed gas to be measured from described air inlet pipeline,, make it to reach original pressure by described electron pressure table pilot-gas amount;
C. add after the mixed gas, the heating tape energized was also worked 30 minutes, and the mixed gas in the described priming device is mixed;
D. connect described trigger switch and make described fire rod igniting;
E. the described pressure sensor signal by showing in the described oscillograph judges whether to be detonation or detonation, and as for detonation, then the time of arrival of blast wave is less than 100 microseconds, and as being detonation, then blast wave time of arrival is greater than 3 milliseconds;
F. calculate the discharge energy of electric spark;
If G. obtain detonation, test then reduced described high-voltage power supply output voltage or reduced described capacitance next time; If obtain detonation, the next capacity of testing the output voltage of the described high-voltage power supply that then raises or increasing described electric capacity; The transition energy of mixed gas direct initiation is between the ignition energy that causes detonation and cause between the detonation ignition energy;
H. near transition energy, repeat test, at least obtain three times and cause the ignition energy of detonation and the ignition energy that causes detonation three times, dwindle the spacing of detonation and detonation ignition energy whereby, least energy spacing is defined as the direct initiation transition energy of this mixed gas to be measured under original pressure between it the most at last.
Priming device of the present invention is applicable to the measurement of 1kPa～20atm original pressure, and the test pressure scope is wide, and is applicable to the measurement of all fuel gas and oxygen or Air mixing gas direct initiation transition energy; By measuring the transition energy that various burning mixtures directly form detonation, can judge the detonation susceptibility of various materials, thereby for the control dangerous matter sources, avoid or reduce the harm of detonation life security and property loss.The present invention is simple in structure, and cost is less, processing ease, and the result of measurement is accurate.
Description of drawings
Accompanying drawing 1 forms the transition energy test system structure synoptic diagram of detonation for direct initiation among the present invention;
Accompanying drawing 3 is detonation wave pressure trajectory diagram among the present invention;
Accompanying drawing 4 is deflagration wave pressure trajectories figure among the present invention.
1-priming device 2-fire rod 3-heating tape 4-control panel 5-PCB pressure transducer 6-high-voltage power supply 7-electric capacity wherein.
Embodiment
Referring to accompanying drawing 1,2, a kind of direct initiation forms the transition energy method of testing of detonation, and it uses a kind of direct initiation to form the transition energy test macro of detonation, the transition energy test macro that described direct initiation forms detonation comprises: priming device 1, oscillograph and firing circuit;
Described priming device 1 is 200mm for internal diameter, wall thickness is 50mm, maximum is born the spherical container of pressure 100MPa, its top is provided with fire rod 2, the cross section of igniter head of described fire rod 2 is the circle of radius 3.5mm, its positive pole is positioned at this circular home position, parcel one deck insulating ceramics between negative pole and the positive pole; Its bottom is provided with heating tape 3, and the one side connects control panel 4, and described control panel 4 one ends are provided with the air inlet pipeline that communicates with described priming device 1, and the other end is provided with vacuum pump; On described control panel 4, be provided with the operation valve of control mixed gas to be measured, and can be by the monitoring of the electron pressure table on the described control panel 4 air inflow; Being provided with model at the opposite side of described priming device 1 is PCB113B24 pressure transducer 5; Described oscillograph connects the output of described pressure transducer 5; Described firing circuit comprises: high-voltage power supply 6, and the electric capacity 7 in parallel with described high-voltage power supply 6, described high-voltage power supply 6 is connected to described fire rod 2 by a trigger switch;
This direct initiation forms the transition energy method of testing of detonation, and it may further comprise the steps:
A. use vacuum pump vacuum pumping in the described priming device 1, pressure is at least less than 80Pa;
B. slowly add mixed gas to be measured from described air inlet pipeline,, make it to reach original pressure by described electron pressure table pilot-gas amount;
C. add after the mixed gas, the heating tape energized was also worked 30 minutes, and the mixed gas in the described priming device 1 is mixed;
D. connect described trigger switch and make described fire rod 2 igniting;
E. described pressure transducer 5 signals by showing in the described oscillograph judge whether to be detonation or detonation, and as for detonation, then the time of arrival of blast wave is less than 100 microseconds, and as being detonation, then blast wave time of arrival is greater than 3 milliseconds;
F. calculate the discharge energy of electric spark; Computing method see also the Chinese patent application of application number for (201210057774.9);
If G. obtain detonation, test then reduced described high-voltage power supply 6 output voltages or reduced described electric capacity 7 capacity next time; If obtain detonation, the next capacity of testing the output voltage of the described high-voltage power supply 6 that then raises or increasing described electric capacity 7; The transition energy of mixed gas direct initiation is between the ignition energy that causes detonation and cause between the detonation ignition energy;
H. near transition energy, repeat test, at least obtain three times and cause the ignition energy of detonation and the ignition energy that causes detonation three times, dwindle the spacing of detonation and detonation ignition energy whereby, least energy spacing is defined as the direct initiation transition energy of this mixed gas to be measured under original pressure between it the most at last.
See table, when initial pressure P
0=100kPa, capacitor C=0.4 μ f charges into C in priming device 1
2H
2-2.5O
2During-70%Ar mixed gas, successful direct initiation and the unsuccessful experimental result of detonating of utilizing this method of testing to obtain; As can be known, be between the 0.80J-0.89J at the direct initiation transition energy under this condition.
Claims (2)
1. a direct initiation forms the transition energy method of testing of detonation, it is characterized in that, it uses a kind of direct initiation to form the transition energy test macro of detonation, and the transition energy test macro that described direct initiation forms detonation comprises: priming device (1), oscillograph and firing circuit; Wherein, described priming device (1) is a spherical container, its internal diameter is 200mm, wall thickness is 50mm, maximum is born pressure 100MPa, described priming device (1) top is provided with fire rod (2), the cross section of igniter head of described fire rod (2) is the circle of radius 3.5mm, its positive pole is positioned at this circular home position, parcel one deck insulating ceramics between negative pole and the positive pole, the bottom of described priming device (1) is provided with heating tape (3), and the one side connects control panel (4), described control panel (4) is provided with the air inlet pipeline that communicates with described priming device (1), and can be by the monitoring of the electron pressure table on the described control panel (4) air inflow; Opposite side at described priming device (1) is provided with pressure transducer (5); Described oscillograph connects the output of described pressure transducer (5); Described firing circuit comprises: high-voltage power supply (6), and the electric capacity (7) in parallel with described high-voltage power supply (6), described high-voltage power supply (6) is connected to described fire rod (2) by a trigger switch;
This direct initiation forms the transition energy method of testing of detonation, and it may further comprise the steps:
A. use vacuum pump the interior vacuum pumping of described priming device (1), pressure is at least less than 80Pa;
B. slowly add mixed gas to be measured from described air inlet pipeline,, make it to reach original pressure by described electron pressure table pilot-gas amount;
C. add after the mixed gas, the heating tape energized was also worked 30 minutes, and the mixed gas in the described priming device (1) is mixed;
D. connect described trigger switch and make described fire rod (2) igniting;
E. described pressure transducer (5) signal by showing in the described oscillograph judges whether to be detonation or detonation, and as for detonation, then the time of arrival of blast wave is less than 100 microseconds, and as being detonation, then blast wave time of arrival is greater than 3 milliseconds;
F. calculate the discharge energy of electric spark;
If G. obtain detonation, test then reduced described high-voltage power supply (6) output voltage or reduced described electric capacity (7) capacity next time; If obtain detonation, test the output voltage of the described high-voltage power supply (6) that then raises or increase the capacity of described electric capacity (7) next time; The transition energy of mixed gas direct initiation is between the ignition energy that causes detonation and cause between the detonation ignition energy;
H. near transition energy, repeat test, at least obtain three times and cause the ignition energy of detonation and the ignition energy that causes detonation three times, dwindle the spacing of detonation and detonation ignition energy whereby, least energy spacing is defined as the direct initiation transition energy of this mixed gas to be measured under original pressure between it the most at last.
2. a kind of direct initiation as claimed in claim 1 forms the transition energy method of testing of detonation, it is characterized in that the model of described pressure transducer (5) is PCB113B24.
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| CN 201210058653 CN102608161B (en) | 2012-03-07 | 2012-03-07 | Method for testing critical energy of detonation formed by direct initiation |
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| CN 201210058653 CN102608161B (en) | 2012-03-07 | 2012-03-07 | Method for testing critical energy of detonation formed by direct initiation |
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| CN102608161B true CN102608161B (en) | 2013-07-24 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102928466B (en) * | 2012-10-25 | 2015-01-07 | 四川威特龙消防设备有限公司 | Oil-gas explosive critical parameter testing device and method |
| CN103954737A (en) * | 2014-04-11 | 2014-07-30 | 中国石油化工股份有限公司 | Minimum ignition energy testing device |
| CN104698121B (en) * | 2015-02-03 | 2016-05-25 | 北京理工大学 | Gas deflagration to detonation transition experimental provision in minute yardstick pipeline |
| CN104792534B (en) * | 2015-02-03 | 2017-10-10 | 北京理工大学 | Rotate detonation engine experimental provision |
| CN108801816B (en) * | 2017-04-28 | 2023-08-18 | 中国人民解放军理工大学 | Large-equivalent underground shallow-buried explosion effect simulation device |
| CN107796628A (en) * | 2017-07-28 | 2018-03-13 | 天津大学 | A kind of constant volume detonation corrosion chamber and method that can monitor detonation wave fluctuation behavior |
| CN108535320B (en) * | 2018-04-08 | 2020-06-16 | 中国矿业大学(北京) | Experimental system for gas and coal dust single or multiple explosion induced by spontaneous combustion of coal in goaf |
| CN115445536A (en) * | 2022-09-20 | 2022-12-09 | 北京理工大学 | Novel experiment method and experiment device for reaction of hydrogen and fluorine gas |
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| CN101576521A (en) * | 2009-06-10 | 2009-11-11 | 西安科技大学 | Device for testing explosion, spreading and explosion suppression characteristics of inflammable gas and dust |
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| CN102253083A (en) * | 2011-05-07 | 2011-11-23 | 西安近代化学研究所 | Detonation performance test method for high-energy imploding explosive |
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| JP4414406B2 (en) * | 2006-03-24 | 2010-02-10 | 住友化学株式会社 | Method and apparatus for measuring critical combustion-supporting gas concentration in mist explosion |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576521A (en) * | 2009-06-10 | 2009-11-11 | 西安科技大学 | Device for testing explosion, spreading and explosion suppression characteristics of inflammable gas and dust |
| CN101726573A (en) * | 2009-11-30 | 2010-06-09 | 浙江工业大学 | Combustible gas explosion experiment system |
| CN102253083A (en) * | 2011-05-07 | 2011-11-23 | 西安近代化学研究所 | Detonation performance test method for high-energy imploding explosive |
Non-Patent Citations (3)
| Title |
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| JP特开2006－208397A 2006.08.10 |
| 张博等.高浓度氩气稀释对C_2H_2-2.5O_2气体直接起爆临界能量影响的实验研究.《高压物理学报》.2012,第26卷(第1期), |
| 高浓度氩气稀释对C_2H_2-2.5O_2气体直接起爆临界能量影响的实验研究;张博等;《高压物理学报》;20120229;第26卷(第1期);第55－61页 * |
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