CN104155341B - A kind of boron powder combustion heat value test device - Google Patents
A kind of boron powder combustion heat value test device Download PDFInfo
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- CN104155341B CN104155341B CN201410388850.3A CN201410388850A CN104155341B CN 104155341 B CN104155341 B CN 104155341B CN 201410388850 A CN201410388850 A CN 201410388850A CN 104155341 B CN104155341 B CN 104155341B
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Abstract
The invention discloses a kind of boron powder combustion heat value test device, including body, bullet, crucible, crucible cover, conductive pole, crucible is fixed on the tripod in body, bullet is arranged on above body, breather is had to communicate with in body in the middle of bullet, breather is provided with thimble-type air valve, two conductive poles are ignitor, conductive pole has aperture, conduction lasso is arranged at top, the aperture that ignition wire two ends respectively penetrate on conductive pole is connected by conduction lasso, crucible cover is positioned at above crucible, crucible cover has the stepped hole of two ceramic embedded, for penetrating ignition wire；Circumferentially there are two row's pilot holes in the middle of sidewall of crucible, the boron powder that combustion heat value is higher can be avoided oxygen bomb parts ablation；Increase crucible volume, it is ensured that abundant oxygen participates in burning；Crucible cover has pressure inside and outside stepped hole balance crucible.Test device particularly suitable fuel boron combustion heat value measures, and applies also for the mensuration of solid propellant, coal, oil substance combustion heating amount.
Description
Technical field
The present invention relates to the test device of a kind of sample combustion thermal discharge, specifically, relate to a kind of boron powder combustion heat value test device.
Background technology
In prior art, measuring through frequently with oxygen bomb calorimeter in the instrument of material caloric value, the oxygen bomb (such as Fig. 1) that wherein sample combustion room and usual indication are said, oxygen bomb volume is about 300mL, and weight is about 2.5kg, through 20MPa hydraulic pressure test.Bullet, body are made up of nickel-chrome alloy steel heat-resisting, corrosion resistant, have good electrical and thermal conductivity, and oxygen bomb top adopts thimble-type self sealss air valve.Blow vent doubles as ignitor, and bullet doubles as another ignitor, is completely cut off by insulant between two electrodes.Ignition wire two penetrates the aperture on conductive pole, and is fixed by conduction lasso, and in the sample that remainder embedment is to be tested, ignition wire with crucible, body contact internal walls, otherwise can not can cause loss of ignition.One of them conductive pole doubles as tripod, is fixed by crucible, and crucible is made up of nickel chromium.During test, sample is placed in crucible, is tightly connected bullet and body；It is filled with the oxygen of certain pressure intensity, energising igniting, makes sample fully burn in oxygen enriched environment.
Disclosed in patent of invention ZL200610042932.8, general calorimeter assembly has been carried out transforming (such as Fig. 2) by a kind of " detector for boron containing lean oxygen propellant heat value ", and adopt block combustion-supporting way, overcome the defect of two aspects in general Calorimetric Techniques: the serious ablation of oxygen bomb parts that boron containing lean oxygen propellant can not fully burn and should not burn.And the combustion heat value for boron powder is tested, owing to boron powder is powder, it is impossible to adopt the powder charge pattern hung, and the combustion heat release amount of boron powder and ignition temperature are significantly high, adopting the oxygen bomb structure of conventional oxygen bomb calorimeter, crucible, support, crucible cover and binding post all have by serious ablation phenomen.
The preparation method describing test sample in patent 201010535657.X " measuring method of boron powder combustion heat value ", namely boron powder and combustion adjuvant closely mix, and existing oxygen bomb is transformed (such as Fig. 3).This measuring method does not have the problem that oxygen bomb parts are ablated.But its deficiency is: the sample of test is made up of boron powder and combustion adjuvant, combustion adjuvant first gasify after with oxygen catalytic combustion, during burning, local produces very atmospheric pressure, and oxygen bomb is internal because the effect of pressure reduction can produce very strong gas flowing, causes that boron particles produces splash.Oxygen bomb is made up of the nickel-chrome alloy steel that heat conductivity is good, it is placed in the distilled water of inner core, temperature about 25 DEG C, so oxygen bomb inner wall temperature is slightly above 25 DEG C, if boron particles splash can be rapidly cooled to oxygen bomb inwall, the B2O3 of surface liquid can completely cut off contacting of boron particles and oxygen after solidifying, causes boron particles imperfect combustion.
Summary of the invention
In order to avoid the deficiency that prior art exists, when overcoming its test boron powder combustion heat value there is, to oxygen bomb inwall, the imperfect combustion problem caused of stopping working in the crucible of oxygen bomb, tripod, the ablation of crucible cover parts and boron particles splash；The present invention proposes a kind of boron powder combustion heat value test device.
nullThe technical solution adopted for the present invention to solve the technical problems is: include body、Crucible、Pilot hole、Tripod、Crucible cover、Conduction lasso、Bullet、Thimble-type air valve、Breather、Insulator、Blow vent、Conductive pole、Stepped hole、Ignition wire,Crucible is positioned at body and is fixed on tripod，Bullet is arranged on above body，Breather is had to communicate with blow vent in body in the middle of bullet，Insulator it is inlaid with between breather and bullet,Breather is provided with thimble-type air valve and is positioned at bullet top,Two conductive poles are ignitor,Wherein long conductive pole one end is fixed on bullet，The long conductive pole other end bends to annulus as tripod，Two conductive poles have aperture，Conductive pole has conduction lasso，Two stepped holes on ignition wire traverse crucible cover,Two ends respectively penetrate aperture on two conductive poles,And be connected by conduction lasso；
Described crucible cover is positioned at above crucible, crucible cover is provided with the stepped hole of two ceramic embedded, is used for penetrating ignition wire；
Described crucible wall middle part has been evenly distributed two row's pilot holes, and two row's pilot holes relative tilts between two outside sidewall of crucible, inclination angle is 60 degree.
Described pilot hole is four or multiple any one.
Described crucible material adopts tungsten alloy.
Described crucible cover material adopts tungsten alloy.
Beneficial effect
The boron powder combustion heat value test device that the present invention proposes, including body, crucible, pilot hole, tripod, crucible cover, conduction lasso, bullet, crucible is positioned at body and is fixed on tripod, bullet is arranged on above body, breather is had to communicate with blow vent in body in the middle of bullet, breather is provided with thimble-type air valve and is positioned at bullet top, two conductive poles are ignitor, stepped hole on ignition wire traverse crucible cover, two ends are respectively penetrated aperture on conductive pole and are connected by conduction lasso, crucible cover is positioned at above crucible, two row's pilot holes it have been evenly distributed in the middle of crucible wall.Crucible and crucible cover material adopt the tungsten alloy of ablation high temperature resistant, resistance to make, and the boron powder that combustion heat value is higher can be avoided oxygen bomb parts ablation；Increase crucible volume, it is ensured that abundant oxygen participates in burning；Crucible wall has two row's pilot holes facing each other, it is to avoid the direct splash of boron particles causes imperfect combustion to oxygen bomb inwall, it is possible to pressure inside and outside balance crucible；Crucible cover has the stepped hole of ceramic embedded, ignition wire is played fixing protective effect, it is ensured that reliable ignition.
The present invention tests device and is particularly well-suited to the mensuration of fuel boron, solid propellant, coal, oil substance combustion heating amount.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, one boron powder combustion heat value of the present invention is tested device to be described in further detail.
Fig. 1 is disclosed document oxygen bomb structural representation.
Fig. 2 is disclosed document " detector for boron containing lean oxygen propellant heat value " schematic diagram.
Fig. 3 is disclosed document " measuring method of boron powder combustion heat value " schematic diagram.
Fig. 4 is combustion heat value of the present invention test apparatus structure schematic diagram.
Fig. 5 is the crucible schematic diagram of combustion heat value of the present invention test device.
Fig. 6 is the crucible cover schematic diagram of combustion heat value of the present invention test device.
Fig. 7 is the crucible cover sectional view of combustion heat value of the present invention test device.
In figure:
1. body 2. crucible 3. pilot hole 4. tripod 5. crucible cover 6. conducts electricity lasso 7. bullet 8. thimble-type air valve 9. breather 10. insulator 11. blow vent 12. conductive pole 13. stepped hole 14. ignition wire 15. cotton thread 16. sample
Detailed description of the invention
The present embodiment is a kind of boron powder combustion heat value test device.
Consult Fig. 1～Fig. 3, by the ultimate principle of oxygen bomb calorimeter test sample combustion heat value be: test system is made up of oxygen bomb calorimeter, igniter, temperature-difference instrument, data acquisition computer.Wherein oxygen bomb calorimeter is made up of oxygen bomb, inner core, urceolus, agitator, temperature sensor, is respectively arranged with appropriate distilled water in inner core, urceolus.First calibrate the thermal capacity of test system, then test.Sample is connected ignition wire and is placed in the crucible of oxygen bomb, in oxygen bomb, be filled with 2MPa oxygen, then be deflated to chamber pressure, so repeat twice, be re-filled with 2MPa oxygen, to ensure that sample is in oxygen environment.Being placed on by oxygen bomb in inner core distilled water, open agitator, start collecting temperature data after inner/outer tube distilled water hygral equilibrium, the heat that sample discharges after lighting can cause oxygen bomb itself and distilled water about to raise about the temperature of adnexa with calorimeter.The combustion heat value of sample can be obtained by processing the temperature variation data of inner/outer tube.
First calibration system thermal capacity before test, uses 90 square piece medicines to demarcate in this example.90 square piece medicines are a kind of single-base powders, and main component is nitrocotton, and wherein the content of nitrocotton reaches 90%.This medicine is easily lighted, the short time can be released bigger heat, and without solid residue after burning, the combustion heat value under aerobic environment is 13327J/g.The 90 square piece medicines that this example uses calibrate system thermal capacity and are 15200J/ DEG C.
There is ignition difficulties in boron powder, only could burn completely in the oxygen environment of continuous high temperature, so test sample is made up of boron powder and combustion adjuvant.
The preparation method of sample is as follows:
Choosing double base propellant as combustion adjuvant, its combustion heat value is 11050J/g, before using, double base propellant is ground into powder.Combustion adjuvant and boron powder is weighed by the mass ratio of 6:1, the above-mentioned combustion adjuvant weighed is used a small amount of effumability solvatrope, and make combustion adjuvant mix homogeneously with boron powder by stirring, then be made into thin slice put in vacuum desiccator dry, thin slice is shredded standby after solvent volatilizees completely.Complete the preparation of sample.
Consult Fig. 4～Fig. 7, the present embodiment boron powder combustion heat value test device, including body 1, crucible 2, pilot hole 3, tripod 4, crucible cover 5, conduction lasso 6, bullet 7, thimble-type air valve 8, breather 9, insulator 10, blow vent 11, conductive pole 12, stepped hole 13, ignition wire 14, cotton thread 15, sample 16, crucible 2 is fixed on the tripod 4 in body 1, bullet 7 is arranged on above body 1, breather 9 is had to communicate with the blow vent 11 in body 1 in the middle of bullet 7, insulator 10 it is inlaid with between breather 9 and bullet 7, breather 9 is provided with thimble-type air valve 8 and is fixed on bullet 7 top, realize gas exchange inside and outside oxygen bomb.Two conductive poles 12 are ignitor, wherein, long conductive pole one end is fixed on bullet 7, the long conductive pole other end bends to annulus as tripod 4, and two conductive poles 12 have aperture, and conductive pole 12 has conduction lasso 6, ignition wire 14 is the stepped hole 13 of two ceramic embedded on crucible cover 5, two ends respectively penetrate the aperture on two conductive poles 12, and by conducting electricity, lasso 6 is fixing to be connected, and ensures reliable ignition.Crucible cover 5 is fixed on above crucible 2, and crucible cover 5 is provided with the stepped hole 13 of two ceramic embedded, is used for penetrating ignition wire 14；Crucible cover 5 material adopts tungsten alloy to make, and the anti-corrosive properties of tungsten alloy, heat conductivity are good, and fusing point is higher；Crucible cover 5 is placed directly within the splash avoiding boron powder on crucible 2, simultaneously by increasing crucible 2 volume, makes the oxygen in crucible 2 be enough to ensure that sample fully burns.Crucible 2 material adopts tungsten alloy to make, and crucible 2 is fixed on tripod 4, and crucible 2 sidewall middle part has been evenly distributed two row's pilot holes 3, and two row's pilot holes 3 relative tilts between two outside crucible 2 wall, inclination angle is 60 degree.Pilot hole on crucible 2 is four or multiple any one.
Adopting two row's pilot holes 3 in the present embodiment, often row's pilot hole 3 is 8.Two row's pilot holes 3 can balance pressure inside and outside crucible 2 when sample combustion, if having boron particles to take crucible 2 out of with air-flow in the gas of pilot hole 3 ejection during burning, pilot hole 3 opposing upper and lower can make boron particles mutually impact and cause quenching, flameout without directly contacting oxygen bomb inwall.
Bullet 7, body 1 adopt nichrome Steel material heat-resisting, corrosion resistant to make, and nickel-chrome alloy steel has good electrical and thermal conductivity performance.
Test is embodied as step and is:
1. weigh 2.5g sample and be placed on crucible bottom, crucible is fixed on tripod.
2. measuring 8cm ignition wire, by the stepped hole of two ceramic embedded on ignition wire traverse crucible cover, ignition wire two ends are respectively penetrated aperture on two conductive poles and are connected by conduction lasso.
3. measure 4cm cotton thread and be connected in ignition wire, fixing crucible cover；Being ignited cotton thread by ignition wire during igniting, crucible bottom fallen by cotton thread, lights crucible bottom sample.
4. install oxygen bomb, it is determined that oxygen bomb seals all right, is filled with 2MPa oxygen, then is deflated to chamber pressure, so repeat twice, then be filled with 2MPa oxygen in oxygen bomb in oxygen bomb.
5. oxygen bomb is put in the distilled water of inner core, it is ensured that oxygen bomb is flooded completely, opens agitator, make inner/outer tube hygral equilibrium.
6. using temperature-difference acquisition software, the sampling time is set to 5s, starts to gather inner/outer tube temperature data.
7. igniting after temperature data 80 groups stable to be collected, record duration of ignition is 4s, and ignition voltage is 10V.
8. sample combustion can make inner core temperature raise, and observes inner core variations in temperature, re-records the descending branch data of one section of temperature after inner core temperature reaches maximum, then turns off collection, stores data.
9. using data processing software, adopt the method for cooling correction that inner/outer tube temperature data is processed, the combustion heat value obtaining sample is 18555J/g, removes the factor of combustion adjuvant, and the combustion heat value finally giving boron powder is 56078J/g.
Claims (4)
- null1. a boron powder combustion heat value test device，It is characterized in that: include body、Crucible、Pilot hole、Tripod、Crucible cover、Conduction lasso、Bullet、Thimble-type air valve、Breather、Insulator、Blow vent、Conductive pole、Stepped hole、Ignition wire,Crucible is positioned at body and is fixed on tripod，Bullet is arranged on above body，Breather is had to communicate with blow vent in body in the middle of bullet，Insulator it is inlaid with between breather and bullet,Breather is provided with thimble-type air valve and is positioned at bullet top,Two conductive poles are ignitor,Wherein long conductive pole one end is fixed on bullet，The long conductive pole other end bends to annulus as tripod，Two conductive poles have aperture，Conductive pole has conduction lasso，Two stepped holes on ignition wire traverse crucible cover,The two ends of ignition wire respectively penetrate the aperture on two conductive poles,And be connected by conduction lasso；Described crucible cover is positioned at above crucible, crucible cover is provided with the stepped hole of two ceramic embedded, is used for penetrating ignition wire；Described crucible wall middle part has been evenly distributed two row's pilot holes, and two row's pilot holes relative tilts between two outside sidewall of crucible, inclination angle is 60 degree.
- 2. boron powder combustion heat value according to claim 1 test device, it is characterised in that: described pilot hole is multiple.
- 3. boron powder combustion heat value according to claim 1 test device, it is characterised in that: described crucible material adopts tungsten alloy.
- 4. boron powder combustion heat value according to claim 1 test device, it is characterised in that: described crucible cover material adopts tungsten alloy.
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| CN201410388850.3A CN104155341B (en) | 2014-08-08 | 2014-08-08 | A kind of boron powder combustion heat value test device |
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| CN201410388850.3A CN104155341B (en) | 2014-08-08 | 2014-08-08 | A kind of boron powder combustion heat value test device |
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| CN104155341B true CN104155341B (en) | 2016-07-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104315537A (en) * | 2014-11-06 | 2015-01-28 | 合肥卓越分析仪器有限责任公司 | Coal sample electric arc igniting method |
| CN105606649A (en) * | 2016-03-09 | 2016-05-25 | 西安近代化学研究所 | High-activity aluminum powder combustion heat measurement method |
| CN109270120B (en) * | 2018-11-08 | 2023-12-22 | 浙江大学 | Heat measuring device and system for on-line measurement of calorific value of pulverized coal |
| CN110411802A (en) * | 2019-08-15 | 2019-11-05 | 西北工业大学 | The production method of boron powder thermal value measurement sample |
| CN112067741A (en) * | 2020-06-28 | 2020-12-11 | 上海航天化工应用研究所 | Device for testing high-temperature and high-pressure environment in oxygen bomb |
| CN112834565B (en) * | 2020-12-31 | 2022-10-14 | 西南科技大学 | Miniature oxygen bomb for small calorimeter |
| CN113390921B (en) * | 2021-06-11 | 2022-04-22 | 英飞智信（苏州）科技有限公司 | Device and method for automatically assembling ignition wire by oxygen bomb |
| CN114252158B (en) * | 2021-12-14 | 2024-03-15 | 上海航天化工应用研究所 | High-temperature high-pressure test system and method for combustion process |
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| DE3217225A1 (en) * | 1982-05-07 | 1983-11-10 | Franz Morat KG Elektro-Feinmechanik & Maschinenbau (GmbH & Co), 7821 Eisenbach | Measuring circuit for a combustion calorimeter |
| CN2475030Y (en) * | 2001-04-26 | 2002-01-30 | 吴熙 | Calorimeter two head oxygen ball |
| CN1219206C (en) * | 2002-11-06 | 2005-09-14 | 中国矿业大学 | Method and device for fast detecting ash content of coal by use of oxygen bomb method |
| CN2906607Y (en) * | 2006-04-27 | 2007-05-30 | 长沙奔特仪器有限公司 | High-pressure combustion container for experiment |
| CN100501391C (en) * | 2006-06-07 | 2009-06-17 | 西北工业大学 | Detector for boron containing lean oxygen propellant heat value |
| CN102680519A (en) * | 2012-05-23 | 2012-09-19 | 长沙开元仪器股份有限公司 | Oxygen bomb |
| CN203479737U (en) * | 2013-07-03 | 2014-03-12 | 广东电网公司电力科学研究院 | Special oxygen bomb for testing biomass calorific value |
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