CN1048563A - Process for smelting semisteel by combined blowing-double flow channel oxygen lance - Google Patents
Process for smelting semisteel by combined blowing-double flow channel oxygen lance Download PDFInfo
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- CN1048563A CN1048563A CN 90104728 CN90104728A CN1048563A CN 1048563 A CN1048563 A CN 1048563A CN 90104728 CN90104728 CN 90104728 CN 90104728 A CN90104728 A CN 90104728A CN 1048563 A CN1048563 A CN 1048563A
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- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 124
- 239000001301 oxygen Substances 0.000 title claims abstract description 124
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 238000003723 Smelting Methods 0.000 title abstract description 13
- 238000000034 method Methods 0.000 title abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 14
- 229910052786 argon Inorganic materials 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 17
- 230000009977 dual effect Effects 0.000 claims description 16
- 238000009628 steelmaking Methods 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 38
- 239000010959 steel Substances 0.000 abstract description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000023556 desulfurization Effects 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 description 13
- 239000011572 manganese Substances 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical group [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a new process for smelting semisteel by an oxygen converter. The oxygen lance is characterized in that a double-oxygen runner oxygen lance with a new structure is adopted at the top, and oxygen is supplied by a main oxygen runner and an auxiliary oxygen runner simultaneously, so that the secondary combustion rate of the converter is improved and slagging is accelerated; meanwhile, nitrogen or argon is blown to the bottom, so that the secondary combustion rate is averagely improved by 8.74 percent, the smelting temperature can be compensated to about 30 ℃, 25 kilograms of scrap steel can be added per ton of steel, the desulfurization rate is improved by 2.18 percent, the total iron in the slag is reduced by 2 to 3 percent at the end of smelting, the oxygen supply time of each furnace is shortened by 5 minutes, and the economic effect is obvious.
Description
The invention belongs to the oxygen converter steelmaking field.Mainly be applicable to semi-steel making, also can be used for the steel-making of common molten iron-steelmaking and middle and high ferrophosphorus water.
Half steel is the work in-process by vanadium-bearing hot metal gained after oxidation style is extracted vanadium slag.Its chemical ingredients (weight %) is: 3.50～3.80%C, and Si≤0.02%, Mn≤0.08%, 0.06～0.10%S, P＜0.05%, V≤0.04%, Ti≤0.01%, surplus is Fe.
Because normally molten iron is low for C, Si, Mn content in the half steel, is shortage of heat and slagging difficulty so utilize the subject matter of semi-steel making.At present, the major technique measure that solves oxygen coverter smelting half steel the problems referred to above is to add or do not add steel scrap less, to reduce the consumption of heat; In addition, add some acidity or neutral oxide, quicken slagging course.
The converter steel factory of overseas utilization semi-steel making has the steel mill of Nizhni Tagil of the Soviet Union and the Kazakhstan Wilder steel company in South Africa, the half steel smelting technology that is adopted is similar substantially, promptly utilize single track oxygen rifle to carry out top blowing oxygen ((Journal of The Iron and Steel Institute) April 1970, P336～341; (vanadium titano-magnetite is developed international academic meeting paper collection, 51～55 pages)).In recent years, the Soviet Union adopts converter top-bottom blowing technology blowing half steel, but does not adopt the dual channel oxygen lance blowing, so the main difficulty of semi-steel making does not solve as yet fully.Dual channel oxygen lance of the prior art, its structure is simpler, and the phenomenon that easily takes place to catch fire in the rifle (external converter top bottom compositing blowing steelmaking technology (two) collection of translations, 244～245 pages, 249～258 pages).
The main drawback of above-mentioned semisteel making technology is:
1. adding amount of scrap steel is few, and the temperature of blow end point molten steel can not get guaranteeing.
2. change the slag difficulty, cause in the steel sulphur content higher, blow end point does not still reach and smelts the desired sulphur content of steel grade sometimes, can not guarantee to smelt according to plan steel grade.
3. oxygen supply intensity is low, and duration of blast is long, and production efficiency is low, long 4～6 minutes of the oxygen supply time ratio blowing low phosphorus pig iron of every stove steel.
The object of the present invention is to provide a kind of novel process of oxygen coverter semi-steel making and the spray gun that is adopted, both solved the problem of shortage of heat and slagging difficulty in the existing semi-steel making technology, can add steel scrap again, shorten the heat, raise labour productivity etc.
For achieving the above object, its main technical schemes is to adopt a kind of dual channel oxygen lance and injection parameters thereof of new texture, improves the post-combustion rate and the quickeningization slag of converter; Bottom nitrogen-blow of converter simultaneously or argon gas.It is the compound blow-double flow duct oxygen lance semisteel making technology and oxygen lance.
The oxygen jet speed height of the main oxygen flow spray orifice of dual channel oxygen lance, oxygen-supplying amount is big, and stream strand diameter is big, and this part oxygen flow is mainly used in oxidation molten bath impurity; The oxygen jet speed of secondary oxygen flow spray orifice is low, and oxygen-supplying amount is little, and stream strand diameter is little, is mainly used in the post-combustion rate that improves furnace gas.1 mark rice under 1500 ℃ of temperature
3CO burns into CO
2, can produce heat 10.383 megajoules.The raising of post-combustion rate has increased the thermal source of steelmaking process; Secondary oxygen flow stirs and oxygenizement slag in addition, helps the fusing of lime, quickens the formation of slag.The bottom feeds rare gas element (nitrogen, argon gas) by gas supply element, can agitation molten pool, improve that conduct heat in the molten bath, mass transfer condition, and quicken to transmit heat, and the chemical reaction between slag-steel is accelerated, more near balance to the molten bath.
Dual channel oxygen lance of the present invention is made up of outer tube, drill conductor, main oxygen deferent, subsidiary oxygen way pipe, shower nozzle and fire prevention copper sleeve.On the main oxygen channel inside pipe wall, inlayed a copper sleeve, prevented to catch fire in the pipe.In addition, drill conductor, main oxygen channel pipe, auxiliary oxygen flow way pipe and shower nozzle is connected all to adopt and is slidingly connected.This connection has following advantage: it is convenient to change oxygen lance blow head; Connect simple than weld seam; Help eliminating the stress that the oxygen rifle expands and produced.
The concrete technology of blowing dual channel oxygen lance smelting half steel again is as follows:
1. dual channel oxygen lance oxygen supply system
Converter has been adorned after molten iron, the steel scrap, and the beginning oxygen supply stops until smelting.The oxygen supply system of dual channel oxygen lance is: the oxygen of main oxygen channel is pressed 0.75～0.85 MPa, oxygen flow 17～18 * 10
3Rice
3/ hour; The oxygen of auxiliary oxygen flow way is pressed 0.5～0.75 MPa, oxygen flow 2.8～4.0 * 10
3Rice
3/ hour.
2. blow the bottom again for the rare gas element system
The blowing before, mid-term nitrogen blowing, the blowing later stage blowing argon gas.Nitrogen-blow intensity is 0.010～0.020 meter
3/ minute ton, winding-up argon intensity is 0.025～0.050 meter
3/ minute ton.
3. slagging regime
Adopt single slag two batch of materials operation, first basicity of slag (CaO/SiO
2) being controlled at 2.5～3.5, finishing slag basicity is controlled at 4.5～6.5.
Compared with prior art, the present invention has following advantage:
1. thermo-efficiency improves, and post-combustion rate on average improves 8.74%, can compensate about 30 ℃ of smelting temperature, uses 25 kilograms of/ton steel of steel scrap more.
2. desulfuration is effective, and the partition ratio ((S)/(S)) of sulphur between slag, steel reaches 9.50 during blow end point, improved 1.55 than common top-blown oxygen steelmaking technology; And when saving 2.13 kilograms of/ton steel of lime, desulfurization degree improves 2.18%.
3. during smelting endpoint, the full iron (TFe) in the slag descends 2～3%; Simultaneously, splash reduces in the converting process, and recovery rate of iron improves 0.4%.
4. oxygen activity in the reduction steel improves the rate of recovery of metal in the iron alloy.As when blowing soft steel, the oxygen activity 50～150PPm that on average descends in steel during its blow end point, residual manganese improves 0.01%; During deoxidation alloying, the rate of recovery of manganese on average improves 2% in the ferromanganese, and the rate of recovery of silicon on average improves 1.5% in the ferrosilicon.
5. can shorten oxygen supply time, improve labour productivity, shorten 5 minutes than common top-blown oxygen converter.
6. dual channel oxygen lance of the present invention is simple and reasonable for structure, and can prevent to catch fire in the rifle, can eliminate the stress that the oxygen rifle expands and produced.
Description of drawings
Accompanying drawing is the structural representation of dual channel oxygen lance of the present invention.1 is outer tube among the figure, and 2 is drill conductor, and 3 is the auxiliary oxygen flow way pipe, and 4 is sealing groove and sealing-ring, and 5 is main oxygen road spray orifice, and 6 is shower nozzle, and 7 is the subsidiary oxygen way spray orifice, and 8 is the main oxygen channel pipe, and 9 is copper sleeve.
Outer tube 1, drill conductor 2, auxiliary oxygen flow way pipe 3 and main oxygen channel pipe 8 are all made with steel pipe, and shower nozzle 6 is made of copper.Shower nozzle 6 except that with main oxygen road spray orifice 5 and subsidiary oxygen way spray orifice 7 corresponding parts, also have and outer tube 1, drill conductor 2, auxiliary oxygen flow way pipe 3 and main oxygen channel pipe 8 corresponding parts.Outer tube 1 adopts with shower nozzle 6 and is welded to connect; Drill conductor 2, main oxygen channel pipe 8 adopt being slidingly connected of no sealing-ring with shower nozzle 6; Auxiliary oxygen flow way pipe 3 adopts with shower nozzle 6 being slidingly connected of sealing-ring.Copper sleeve 9 is embedded on the inwall of main oxygen channel pipe 8.Dual channel oxygen lance shower nozzle parameter is as shown in table 1.
Table 1 dual channel oxygen lance shower nozzle parameter
| Main oxygen road spray orifice | The subsidiary oxygen way spray orifice | |||||
| Spray orifice (number) | Throat diameter (mm) | Exit diameter (mm) | Inclination alpha 1(degree) | Spray orifice (number) | Throat diameter (mm) | Inclination alpha 2(degree) |
| 3～5 | 32～38 | 42～46 | 9～13 | 6～10 | 12～16 | 25～35 |
Inclination alpha 1 expression main oxygen road spray orifice and oxygen rifle medullary ray angle, α 2 is subsidiary oxygen way spray orifice and oxygen rifle medullary ray angle.
Embodiment
Adopt dual channel oxygen lance of the present invention and compound blow-double flow duct oxygen supply blow moulding, on 120 tons of oxygen coverters, carried out the test of 3 stoves blowing half steel.Chemical ingredients of 3 stove half steels (weight %) and temperature are as shown in table 2.In smelting process, 3 stove steel add 12,10,12 tons of steel scraps respectively.The air feed parameter of 3 stove smelting steel processes is as shown in table 3.
The chemical ingredients (weight %) and the temperature of table 2 embodiment 3 stove half steels
| Heat (batch) number | Chemical Composition (%) | Temperature ℃ | |||||||
| C | Si | Mn | S | P | V | Ti | Fe | ||
| 1 | 3.50 | 0.01 | 0.06 | 0.066 | 0.035 | 0.03 | 0.01 | All the other | 1280 |
| 2 | 3.80 | 0.02 | 0.07 | 0.090 | 0.049 | 0.03 | 0.01 | All the other | 1270 |
| 3 | 3.60 | 0.01 | 0.05 | 0.087 | 0.045 | 0.02 | 0.01 | All the other | 1270 |
The oxygen supply of table 3 embodiment smelting process and confession nitrogen or argon system
| Heat (batch) number | The main oxygen channel oxygen supply | The auxiliary oxygen flow way oxygen supply | For nitrogen intensity rice 3/ minute ton | Oxygen supply intensity rice 3/ minute ton | ||
| Oxygen is pressed MPa | Oxygen flow * 10 3Rice 3/ hour | Oxygen is pressed MPa | Oxygen flow * 10 3Rice 3/ hour | |||
| 1 | 0.77 | 17.4 | 0.54 | 3.1 | 0.010 | 0.025 |
| 2 | 0.80 | 17.0 | 0.52 | 3.0 | 0.016 | 0.030 |
| 3 | 0.83 | 17.5 | 0.56 | 3.8 | 0.012 | 0.035 |
Be respectively 29,28,32 minutes the tap to tap time that 3 furnace steel final slag basicities are respectively 5.54,6.5,5.5,3 stove steel.
Claims (8)
1, a kind of semi-steel making technology of oxygen coverter is characterized in that top employing dual channel oxygen lance oxygen supply and corresponding main oxygen channel and auxiliary oxygen flow way oxygen supply system, bottom nitrogen-blow or argon gas and corresponding air supply intensity, and slagging regime.
2, technology according to claim 1 is characterized in that the oxygen supply system of dual channel oxygen lance is as follows: main oxygen channel oxygen is pressed 0.75～0.85 MPa, oxygen flow 17～18 * 10
3Rice
3/ hour; Auxiliary oxygen flow way oxygen is pressed 0.5～0.75 MPa, oxygen flow 2.8～4.0 * 10
3Rice
3/ hour.
3,, it is characterized in that converter bottom nitrogen-blow intensity is 0.010～0.020 meter according to claim 1 and 2 described technologies
3/ minute ton, winding-up argon gas intensity is 0.025～0.050 meter
3/ minute ton.
4, technology according to claim 1 is characterized in that slagging regime is that just basicity of slag is controlled at 2.5～3.5, and finishing slag basicity is controlled at 4.5～6.5.
5, a kind of dual channel oxygen lance that is used for oxygen converter steelmaking, it includes main oxygen channel pipe and auxiliary oxygen flow way pipe, it is characterized in that it is made up of outer tube 1, drill conductor 2, auxiliary oxygen flow way pipe 3, main oxygen channel pipe 8, shower nozzle 6, sealing groove and sealing-ring 4, main oxygen road spray orifice 5, subsidiary oxygen way spray orifice 7, copper sleeve 9.
6, oxygen rifle according to claim 5 is characterized in that copper sleeve 9 is embedded on the inwall of main oxygen channel pipe 8.
7, oxygen rifle according to claim 5 is characterized in that outer tube 1 and shower nozzle 6 employings are welded to connect, and drill conductor 2, main oxygen channel pipe 8 adopt being slidingly connected of no sealing-ring with shower nozzle 6, and auxiliary oxygen flow way pipe 3 adopts with shower nozzle 6 being slidingly connected of sealing-ring.
8, oxygen rifle according to claim 5 is characterized in that main oxygen road spray orifice 5 and oxygen rifle medullary ray angle α
1Be 9～13 °, subsidiary oxygen way spray orifice 7 and oxygen rifle medullary ray angle α
2It is 25～35 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90104728 CN1017999B (en) | 1990-07-23 | 1990-07-23 | Process for smelting semisteel by using combined blowing-double-channel oxygen lance and oxygen lance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90104728 CN1017999B (en) | 1990-07-23 | 1990-07-23 | Process for smelting semisteel by using combined blowing-double-channel oxygen lance and oxygen lance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1048563A true CN1048563A (en) | 1991-01-16 |
| CN1017999B CN1017999B (en) | 1992-08-26 |
Family
ID=4878712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90104728 Expired CN1017999B (en) | 1990-07-23 | 1990-07-23 | Process for smelting semisteel by using combined blowing-double-channel oxygen lance and oxygen lance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017999B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575656B (en) * | 2009-06-18 | 2010-12-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Oxygen top blown converter steel making method |
| CN101597664B (en) * | 2009-06-18 | 2011-01-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Oxygen top-blown converter steelmaking method |
| CN102002551A (en) * | 2010-12-09 | 2011-04-06 | 中冶南方工程技术有限公司 | Double-channel oxygen lance |
| CN102134627A (en) * | 2011-03-01 | 2011-07-27 | 中冶南方工程技术有限公司 | Double-channel oxygen lance |
| CN103060510A (en) * | 2013-01-01 | 2013-04-24 | 北京科技大学 | High scrap ratio smelting method by adopting gas to heat |
| CN106282481A (en) * | 2016-10-28 | 2017-01-04 | 钢铁研究总院 | A kind of double fluid stock oxygen rifle and using method thereof |
| CN110229941A (en) * | 2019-06-17 | 2019-09-13 | 武汉工程大学 | A kind of double-work medium oxygen rifle |
-
1990
- 1990-07-23 CN CN 90104728 patent/CN1017999B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575656B (en) * | 2009-06-18 | 2010-12-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Oxygen top blown converter steel making method |
| CN101597664B (en) * | 2009-06-18 | 2011-01-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Oxygen top-blown converter steelmaking method |
| CN102002551A (en) * | 2010-12-09 | 2011-04-06 | 中冶南方工程技术有限公司 | Double-channel oxygen lance |
| CN102134627A (en) * | 2011-03-01 | 2011-07-27 | 中冶南方工程技术有限公司 | Double-channel oxygen lance |
| CN102134627B (en) * | 2011-03-01 | 2012-11-14 | 中冶南方工程技术有限公司 | Double-channel oxygen lance |
| CN103060510A (en) * | 2013-01-01 | 2013-04-24 | 北京科技大学 | High scrap ratio smelting method by adopting gas to heat |
| CN106282481A (en) * | 2016-10-28 | 2017-01-04 | 钢铁研究总院 | A kind of double fluid stock oxygen rifle and using method thereof |
| CN106282481B (en) * | 2016-10-28 | 2018-07-06 | 钢铁研究总院 | A kind of double fluid stock oxygen rifle and its application method |
| CN110229941A (en) * | 2019-06-17 | 2019-09-13 | 武汉工程大学 | A kind of double-work medium oxygen rifle |
| CN110229941B (en) * | 2019-06-17 | 2024-04-16 | 武汉工程大学 | Double-station oxygen gun |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017999B (en) | 1992-08-26 |
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