CN103954737A - Minimum ignition energy testing device - Google Patents
Minimum ignition energy testing device Download PDFInfo
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- CN103954737A CN103954737A CN201410146252.5A CN201410146252A CN103954737A CN 103954737 A CN103954737 A CN 103954737A CN 201410146252 A CN201410146252 A CN 201410146252A CN 103954737 A CN103954737 A CN 103954737A
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Abstract
The invention relates to a minimum ignition energy testing device mainly used for solving problems of existing technology that testing temperature range is relatively narrow, and testing accuracy is relatively low. According to the minimum ignition energy testing device, the main body of a mixer (5) is provided with an air inlet pipeline, a steam inlet pipeline, and a mixed gas outlet pipeline; a stirrer (4) is arranged in the mixer (5); a reactor (7) is provided with an gas inlet (9); the two sides of the reactor (7) are provided with electrode regulators; one end of an ignition electrode is connected with the electrode regulators via threaded connection, and the other end is connected with a precise sparker (10); the mixed gas outlet pipeline of the mixer (5) is connected with the gas inlet (9) of the reactor (7); a connection pipeline between a mixed gas outlet of the mixer (5) and the gas inlet (9) of the reactor is connected with a vacuum pump. The minimum ignition energy testing device is capable of solving the above problems, and can be used for minimum ignition energy testing.
Description
Technical field
The present invention relates to a kind of device for testing minimum ignition energy.
Background technology
Three pacing itemss that inflammable gas or liquid vapour fire be combustable gas concentration in explosion limits, oxygenant and the incendiary source of suitable concn, wherein incendiary source only reaches the minimum ignition energy of this material under this condition and could cause and fire.Therefore, minimum ignition energy is to weigh the important parameter of inflammable gas or liquid vapour explosion hazard, is also the important parameter of electrostatic safety, and can be the control of the danger such as inflammable gas or steam generation burning, blast and control provides the reference of use.Because inflammable gas or liquid vapour have inflammable and explosive feature, its corresponding minimum ignition energy value is less, therefore, must accurately measure its minimum ignition energy value, and in the time of real work, to be strict controlled in below minimum ignition energy value, to ensure safety in production.Therefore, the accurate measurement of inflammable gas or liquid vapour minimum ignition energy has very important significance.
The proving installation that GB/T16428-1996 recommends is 20L blast ball or Hartmann Bomb.The proving installation that CN101692081A recommends is 0.5L proving installation, but it is narrower that this device can be tested the temperature range of sample, and test cavity material is organic glass, organic glass is material meeting deliquescing in the time that temperature exceedes 100 DEG C, affecting larger is sparking electrode retaining thread, eccentric screw-in when screw thread deliquescing causes electrode separation to regulate, thus cause the adjustment of electrode separation accurately to measure.In addition, the electrode material that this device adopts is stainless steel, stainless steel electrode is after repeatedly striking sparks, the most advanced and sophisticated high-temperature oxydation that can occur generates tri-iron tetroxide, most advanced and sophisticated tri-iron tetroxide can impact low-yield arc discharge, and when ignition energy, stainless steel electrode cannot regular picture during lower than 0.5mJ.
The present invention has solved the problems referred to above targetedly.
Summary of the invention
Technical matters to be solved by this invention is the problem that in prior art, Range of measuring temp is narrower, measuring accuracy is lower, and a kind of new device for testing minimum ignition energy is provided.This device, for the test of minimum ignition energy, has advantages of that Range of measuring temp is wider, measuring accuracy is higher.
For addressing the above problem, the technical solution used in the present invention is as follows: a kind of device for testing minimum ignition energy, comprise steam generator (3), mixer (5), reactor (7), Precision EDM generator (10), mixer (5) main body is provided with air intake pipeline, steam inlet pipeline, mixed gas outlet pipeline, in mixer (5), be provided with stirrer (4), reactor (7) is provided with air intake opening (9), both sides are provided with electrode regulator, spark electrode one end and electrode regulator are threaded connection, the other end is connected with Precision EDM generator (10), the mixed gas outlet pipeline of mixer (5) is connected with the air intake opening (9) of reactor (7), on associated line between the mixed gas outlet of mixer (5) and reactor air intake opening (9), be also connected to vacuum pump.
In technique scheme, preferably, described steam generator (3) should strictly seal, and is positioned in incubator (2), and incubator (2) temperature controlling range is 25～150 DEG C, and temperature measurement error is ± 2 DEG C.
In technique scheme, preferably, the pressure-bearing of described mixer (5) is not less than 980KPa, and mixer (5) and reactor (7) are all positioned in incubator (6), and the temperature controlling range of incubator (6) is 25～150 DEG C, and temperature control error is ± 2 DEG C.
In technique scheme, preferably, the motive seal intensity of the stirrer connecting rod on described mixer (5) is not less than 490KPa.
In technique scheme, preferably, described mixer (5) is provided with digital pressure vacuum gauge, measurement range is 0～600KPa, resolution is 1KPa, associated line between mixer (5) and reactor (7) is provided with sample analysis pipeline (11), between the mixed gas outlet and sample analysis pipeline (11) tie point of mixer (5), between reactor air intake opening (9) and sample analysis pipeline (11) tie point, between air intake opening (9) and reactor (7), on air intake pipeline, be equipped with valve on the pipeline of steam inlet; Described vacuum pump can complete vacuumizing mixer (5) and/or reactor (7).
In technique scheme, preferably, described electrode regulator rotary part adopts hard material, and main element is organic glass, and electrode adopts tungsten filament to make, and electrode interior cover has the sealing of O type circle, and eletrode tip is symmetrical in reactor (7) radial center position; Antidetonation pressure vacuum gauge test specification on reactor (7) is 0～490KPa.
In technique scheme, preferably, described accurate spark generator (10) is made up of voltage stabilizing high-voltage power supply, energy storage capacitor storehouse and control system three parts, and voltage stabilizing high-voltage power supply is the direct supply of the highest exportable 20KV, the highest DC current 3mA, power 50W; The capacitance level that energy storage capacitor lab setting is different, and different brackets can combination in any, therefore can coordinate high-voltage power supply to produce different ignition energies; Control system is made up of industrial Programmable Logic Controller PLC and corresponding relay and button, so as to completing electrode pair zero, capacitance selection and starting the functions such as electric discharge.
In technique scheme, preferably, the relative humidity of described air is lower than 30%.
In technique scheme, preferably, described hard material is copper.
In technique scheme, preferably, described reactor (7) is provided with antidetonation pressure vacuum gauge, safety valve (8).
This patent can effectively be measured the minimum ignition energy of inflammable gas under 25～150 DEG C of conditions or steam, is more close to working condition.The material of electrode fixed position is copper, the impact of having avoided high temperature to adjust electrode separation.Spark electrode material adopts tungsten filament, measuring accuracy is further improved, having avoided stainless steel that oxidation occurs after electrode discharge causes after discharge to puncture, electrode can reignition least energy reach the findable electric discharge phenomena of 0.08mJ(naked eyes), fire more accurate means of testing is provided for controlling better and take precautions against inflammable gas or steam, obtained good technique effect.
Brief description of the drawings
Fig. 1 is the structural representation of device of the present invention.
1. air gas cylinder; 2. incubator; 3. inflammable gas steam generator; 4. stirrer; 5. mixer; 6. incubator; 7. reactor; 8. safety valve; 9 air intake openings; 10. Precision EDM generator; 11. sample analysis pipelines.
Below by embodiment, the invention will be further elaborated, but be not limited only to the present embodiment.
Embodiment
[embodiment 1]
On the proving installation shown in Fig. 1, relative humidity is lower than 30% cleaned air air bottle splendid attire, and the volume of air bottle is that 50L, pressure-bearing are 196 × 10
2kPa.The thick alloy aluminium sheet of steam generator 3 use 5mm is welded, and should strictly seal, and its volume is 45 ± 5L, is positioned in incubator 2.Incubator 2 adopts heat-conducting oil heating case, and temperature controlling range is 25～150 DEG C, and temperature measurement error is ± 2 DEG C, and the temperature controlling range of incubator 6 is 25～150 DEG C, and temperature control error is ± 2 DEG C.Mixer 5 use steel plates are made, and pressure-bearing must not be lower than 980KPa, and volume is 40 ± 5L, is positioned in incubator 6.Stirrer connecting rod is of a size of
10 × 250mm; Screw propeller length is 100mm; The motive seal intensity of connecting rod must not be less than 490kPa.It is 0～600KPa that numeral pressure vacuum gauge adopts measurement range, and resolution is 1KPa, gaseous tension in test mixing device 5.The speed of exhaust of vacuum pump is that 1～2L/s, final vacuum are not less than 7 × 15
-5kPa.Reactor 7 use organic glass are made, and volume is 0.5L, in its both sides, electrode regulator is housed, be used for regulating electrode gap, electrode regulator rotary part adopts fine copper material, and spark electrode and electrode regulator are threaded connection, and spark electrode internal sleeve has the sealing of O type circle.Antidetonation pressure vacuum gauge is equipped with on reactor 7 tops, and safety valve and air intake opening are equipped with in bottom, gets final product pressure release in the time that reactor pressure exceedes 140kPa.Reactor is answered good seal.The pressure vacuum meter test specification linking with reactor is 0～490kPa.Electrode adopts tungsten filament to make, and its diameter is 0.3mm, and tip curvature radius is 6 × 10-3mm.
Describe in detail below and adopt this proving installation to carry out the testing procedure of minimum ignition energy.
1, prepare
1.1 pack electrode on the conductive pole being set in electrode regulating screw rod into.
1.2 are transferred to required separation distance between 0.5～2.5mm by electrode regulating bar by electrode gap, and make eletrode tip be symmetrical in reactor radial center position.
Reactor is placed in incubator II by 1.3, and be connected with mixer and vacuum pump by valve.
1.4 are connected the electrode in reactor with accurate spark generator.
1.5 according to institute's test specimens ignition energy size, choose capacitor (capability value is 5～100pF), and electricity consumption looks is measured its capacitance.
1.6 check that whether circuit, instrument and each system be intact.Gas distributing system has or not gas leak phenomenon.
Before 1.7 tests, reply steam generator cleans, and method is as follows.
1.7.1 first with clean-out system, foreign material in steam generator are cleaned up.Then be placed in incubator I and be connected with mixer by valve.
1.7.2 open incubator I, make its temperature remain on test temperature required, start vacuum pump, open steam generator sample inlet, use air cleaning two hours.
2, distribution
First adopt dividing potential drop method to allot the combination gas a little more than desired concn, and then slowly add cleaned air, make it reach desired concn.
The air distributing method of 2.1 liquor samples:
2.1.1 by liquor sample steam injection generator, it is temperature required that unlatching incubator I makes its temperature remain on test, and keep 1h, makes it reach liquid gas balance.
2.1.2 for avoiding steam liquefied, opening incubator II, to be heated to remain on test to mixer and reactor temperature required and keep constant temperature, until off-test.
2.1.3 start vacuum pump, extract air in mixer out.In the time that pressure indicated value is less than 2kPa, close each valve and vacuum pump, stop bleeding.
2.1.4 the steam in steam generator is put into evacuated mixer, put into quantity of steam and read by digital pressure vacuum gauge, quantity of steam should be determined according to the mixture strength that will prepare, then close mixer.
2.1.5 according to preparation mixture strength, a certain amount of cleaned air in air bottle is filled with in mixer and is mixed with combustible vapor.Be filled with air capacity and read by pressure vacuum meter, then close.Start stirrer, stir 10～15min, the gas in mixer is mixed.
The air distributing method of 2.2 gas samples is as follows:
When gas sample distribution, require air distributing device within the scope of explosion limits, all can allot the combination gas of variable concentrations to any combustible gas.And distribution error must not be greater than ± and 0.1%, the analysis of gas concentration is got and is entered chromatogram after gas and demarcate by sample tap.As adopt the gas distributing system of this patent, can be by following program distribution.
2.2.1 gas bomb is communicated with mixer, and by 2.1.4 requirement, mixer is evacuated.
2.2.2 by 2.1.5 method, gas sample is put into mixer, inflate air to mixer, mix with inflammable gas.
2.3 regulate the temperature (20～150 DEG C) of incubator I, II, can test the minimum ignition energy under different temperatures.
3, minimum ignition energy (E
min) mensuration
3.1 under sensitiveness, with 25 electric discharge tests, normative reference GB/T14288-93.That is: first select a sparking voltage that is enough to blasting test gas, then gradually reduce the magnitude of voltage on (at every turn reducing by 100～250V) storage capacitor, on each magnitude of voltage, all carry out 25 electric discharges, until 25 electric discharges all can not be lighted test gas.In above-mentioned all electric discharges, light the least energy of this gas, be minimum ignition energy (E
min).
3.2 by 3.1 revision tests, until the minimum voltage deviation of lighting of three tests is less than 100～250V, finally get minimum minimum ignition energy of lighting voltmeter calculation test gas in three times.
4, the calculating of result
4.150% ignition energy (E
50) calculating
E
50=0.5CU
50 2（1）
In formula:
C=C
1+C
2
C
1---storage capacitor amount, pF;
C
2---circuit Equivalent Distributed electric capacity, pF;
U
50---corresponding keep-alive voltage when the rate of lighting is 50%, V.
4.2 minimum ignition energy (E
min) calculating
E
min=0.5CU
2（2）
In formula:
U---25 definite minimum keep-alive voltages of test method, V;
C---sensitization capacitance amount, pF.
[comparative example]
According to condition and step described in embodiment 1, incubator 2 is not just set, the material of electrode fixed position is organic glass, electrode material adopts stainless steel, Range of measuring temp narrower (25～100 DEG C), and also test cavity material is organic glass, organic glass is material meeting deliquescing in the time that temperature exceedes 100 DEG C, affecting larger is sparking electrode retaining thread, eccentric screw-in when screw thread deliquescing causes electrode separation to regulate, thus cause the adjustment of electrode separation accurately to measure.In addition, stainless steel electrode is after sparking repeatedly, and the most advanced and sophisticated high-temperature oxydation that can occur generates tri-iron tetroxide, and most advanced and sophisticated tri-iron tetroxide can impact low-yield arc discharge, and when ignition energy, stainless steel electrode cannot regular picture during lower than 0.5mJ.
Adopt method of the present invention, can effectively measure the minimum ignition energy of inflammable gas under 25～150 DEG C of conditions or steam, be more close to working condition.The material of electrode fixed position is copper, the impact of having avoided high temperature to adjust electrode separation.Spark electrode material adopts tungsten filament, measuring accuracy is further improved, having avoided stainless steel that oxidation occurs after electrode discharge causes after discharge to puncture, electrode can reignition least energy reach 0.08mJ, fire more accurate means of testing be provided for controlling better and take precautions against inflammable gas or steam.
Claims (10)
1. a device for testing minimum ignition energy, comprise steam generator (3), mixer (5), reactor (7), Precision EDM generator (10), mixer (5) main body is provided with air intake pipeline, steam inlet pipeline, mixed gas outlet pipeline, in mixer (5), be provided with stirrer (4), reactor (7) is provided with air intake opening (9), both sides are provided with electrode regulator, spark electrode one end and electrode regulator are threaded connection, the other end is connected with Precision EDM generator (10), the mixed gas outlet pipeline of mixer (5) is connected with the air intake opening (9) of reactor (7), on associated line between the mixed gas outlet of mixer (5) and reactor air intake opening (9), be also connected to vacuum pump.
2. device for testing minimum ignition energy according to claim 1, is characterized in that described steam generator (3) should strictly seal, and is positioned in incubator (2), incubator (2) temperature controlling range is 25～150 DEG C, and temperature measurement error is ± 2 DEG C.
3. device for testing minimum ignition energy according to claim 1, the pressure-bearing that it is characterized in that described mixer (5) is not less than 980KPa, mixer (5) and reactor (7) are all positioned in incubator (6), and the temperature controlling range of incubator (6) is 25～150 DEG C, and temperature control error is ± 2 DEG C.
4. device for testing minimum ignition energy according to claim 1, is characterized in that the motive seal intensity of the stirrer connecting rod on described mixer (5) is not less than 490KPa.
5. device for testing minimum ignition energy according to claim 1, it is characterized in that described mixer (5) is provided with digital pressure vacuum gauge, measurement range is 0～600KPa, resolution is 1KPa, associated line between mixer (5) and reactor (7) is provided with sample analysis pipeline (11), between the mixed gas outlet and sample analysis pipeline (11) tie point of mixer (5), between reactor air intake opening (9) and sample analysis pipeline (11) tie point, between air intake opening (9) and reactor (7), on air intake pipeline, on the pipeline of steam inlet, be equipped with valve, described vacuum pump can complete vacuumizing mixer (5) and/or reactor (7).
6. device for testing minimum ignition energy according to claim 1, it is characterized in that described electrode regulator rotary part adopts hard material, main element is organic glass, electrode adopts tungsten filament to make, electrode interior cover has the sealing of O type circle, and eletrode tip is symmetrical in reactor (7) radial center position; Antidetonation pressure vacuum gauge test specification on reactor (7) is 0～490KPa.
7. device for testing minimum ignition energy according to claim 1, it is characterized in that described accurate spark generator (10) is made up of voltage stabilizing high-voltage power supply, energy storage capacitor storehouse and control system three parts, voltage stabilizing high-voltage power supply is the direct supply of the highest exportable 20KV, the highest DC current 3mA, power 50W; The capacitance level that energy storage capacitor lab setting is different, and different brackets can combination in any, therefore can coordinate high-voltage power supply to produce different ignition energies; Control system is made up of industrial Programmable Logic Controller PLC and corresponding relay and button, so as to completing electrode pair zero, capacitance selection and starting the functions such as electric discharge.
8. device for testing minimum ignition energy according to claim 1, is characterized in that the relative humidity of described air is lower than 30%.
9. device for testing minimum ignition energy according to claim 6, is characterized in that described hard material is copper.
10. device for testing minimum ignition energy according to claim 1, is characterized in that described reactor (7) is provided with antidetonation pressure vacuum gauge, safety valve (8).
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Cited By (14)
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| CN104374866A (en) * | 2014-11-20 | 2015-02-25 | 武汉理工大学 | Ignition electrode gap adjustable constant-volume combustion device |
| CN104749217A (en) * | 2015-03-27 | 2015-07-01 | 中国石油大学(华东) | Ultralow temperature combustible gas explosion minimum ignition energy testing system and method |
| CN104897305A (en) * | 2015-05-12 | 2015-09-09 | 清华大学 | Electric spark ignition energy calibration system under high pressure and method thereof |
| CN106404986A (en) * | 2016-08-31 | 2017-02-15 | 上海安平静电科技有限公司 | Test device and test method for electrostatic discharge ignition |
| CN106872664A (en) * | 2017-04-17 | 2017-06-20 | 中国石油化工股份有限公司 | The method of testing of the critical propagation diameter of fuel gas |
| CN106872640A (en) * | 2017-04-17 | 2017-06-20 | 中国石油化工股份有限公司 | The test device of the critical propagation diameter of fuel gas |
| CN107643318A (en) * | 2016-12-01 | 2018-01-30 | 中国石油化工股份有限公司 | Combustion explosion of combustible gas characteristic test method under hot conditions |
| CN107688085A (en) * | 2017-08-16 | 2018-02-13 | 上海化工研究院有限公司 | A kind of light-duty simulation test device for the checking of gas burst accident |
| CN108627608A (en) * | 2018-03-28 | 2018-10-09 | 东北大学 | Ignition of flammable vapour sensibility tubular type test device and test method under flow regime |
| CN109668930A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test method of gas-particle two-phase combustible material minimum ignition energy |
| CN109668999A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test device of gas-particle two-phase combustible material minimum ignition energy |
| CN111766330A (en) * | 2020-06-30 | 2020-10-13 | 南京三鸣智自动化工程有限公司 | Gas detection device and detection method |
| CN111896675A (en) * | 2020-08-10 | 2020-11-06 | 国网湖南省电力有限公司 | Test system and test method for simulating transformer fire combustion under electric field condition |
| CN114113922A (en) * | 2020-11-25 | 2022-03-01 | 核工业理化工程研究院 | Dynamically adjustable vacuum ignition air inlet device and adjusting method thereof |
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| CN104374866A (en) * | 2014-11-20 | 2015-02-25 | 武汉理工大学 | Ignition electrode gap adjustable constant-volume combustion device |
| CN104374866B (en) * | 2014-11-20 | 2016-09-14 | 武汉理工大学 | Ignitor clearance adjustable type CONSTANT VOLUME MODEL COMBUSTION CHAMBER |
| CN104749217A (en) * | 2015-03-27 | 2015-07-01 | 中国石油大学(华东) | Ultralow temperature combustible gas explosion minimum ignition energy testing system and method |
| CN104749217B (en) * | 2015-03-27 | 2018-06-05 | 中国石油大学(华东) | Flammable gas explosion minimum ignition energy tests system and method under ultralow temperature |
| CN104897305A (en) * | 2015-05-12 | 2015-09-09 | 清华大学 | Electric spark ignition energy calibration system under high pressure and method thereof |
| CN104897305B (en) * | 2015-05-12 | 2017-05-24 | 清华大学 | Electric spark ignition energy calibration system under high pressure and method thereof |
| CN106404986A (en) * | 2016-08-31 | 2017-02-15 | 上海安平静电科技有限公司 | Test device and test method for electrostatic discharge ignition |
| CN107643318A (en) * | 2016-12-01 | 2018-01-30 | 中国石油化工股份有限公司 | Combustion explosion of combustible gas characteristic test method under hot conditions |
| CN106872640A (en) * | 2017-04-17 | 2017-06-20 | 中国石油化工股份有限公司 | The test device of the critical propagation diameter of fuel gas |
| CN106872664A (en) * | 2017-04-17 | 2017-06-20 | 中国石油化工股份有限公司 | The method of testing of the critical propagation diameter of fuel gas |
| CN107688085A (en) * | 2017-08-16 | 2018-02-13 | 上海化工研究院有限公司 | A kind of light-duty simulation test device for the checking of gas burst accident |
| CN109668930A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test method of gas-particle two-phase combustible material minimum ignition energy |
| CN109668999A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test device of gas-particle two-phase combustible material minimum ignition energy |
| CN109668930B (en) * | 2017-10-17 | 2022-06-17 | 中国石油化工股份有限公司 | Method for testing minimum ignition energy of gas-solid two-phase combustible material |
| CN108627608A (en) * | 2018-03-28 | 2018-10-09 | 东北大学 | Ignition of flammable vapour sensibility tubular type test device and test method under flow regime |
| CN111766330A (en) * | 2020-06-30 | 2020-10-13 | 南京三鸣智自动化工程有限公司 | Gas detection device and detection method |
| CN111766330B (en) * | 2020-06-30 | 2022-04-19 | 南京三鸣智自动化工程有限公司 | Gas detection device and detection method |
| CN111896675A (en) * | 2020-08-10 | 2020-11-06 | 国网湖南省电力有限公司 | Test system and test method for simulating transformer fire combustion under electric field condition |
| CN114113922A (en) * | 2020-11-25 | 2022-03-01 | 核工业理化工程研究院 | Dynamically adjustable vacuum ignition air inlet device and adjusting method thereof |
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Application publication date: 20140730 |