CN2673879Y - Furnace wall carbon oxygen spray gun for novel super high power electric steel-smelting furnace - Google Patents
Furnace wall carbon oxygen spray gun for novel super high power electric steel-smelting furnace Download PDFInfo
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- CN2673879Y CN2673879Y CN 200320123669 CN200320123669U CN2673879Y CN 2673879 Y CN2673879 Y CN 2673879Y CN 200320123669 CN200320123669 CN 200320123669 CN 200320123669 U CN200320123669 U CN 200320123669U CN 2673879 Y CN2673879 Y CN 2673879Y
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Abstract
The utility model discloses a novel furnace wall carbon oxygen spray gun for a super high power electric steel-smelting furnace, which is characterized in that the carbon oxygen spray gun comprises a beaming oxygen shooting gun (7) and a carbon spray gun (4); the beaming oxygen shooting gun (7) comprises a hypersonic oxygen spray nozzle (1) and a circumfluence oxygen spray nozzle (2); both the beaming oxygen shooting gun (7) and the carbon spray gun (4) are installed in a water cooled copper box (5). The main oxygen stream of the center of the spray nozzle of the beaming oxygen shooting gun points to a molten pool, and a circumambient combustion-gas stream or an epoxy stream is added outside the periphery of the main oxygen stream to fulfill an envelope protecting function to the main oxygen stream to cause the main oxygen stream to keep a beaming status at a longer distance, in order to be provided with a strong penetrating ability. The carbon spray gun and the beaming oxygen shooting gun are arranged in parallel, and are installed in the water cooled copper box, the water cooled copper box is installed at the top (6) of a furnace wall fire brick layer, the front part surface of the water cooled copper box and the heat surface of the fire brick are basically positioned at the same cylindric surface to cause the distance between the beaming oxygen shooting gun, the carbon spray gun and the molten pool to be shorter, and the spray angle is more reasonable. The carbon oxygen spray gun can efficiently lead the chemical energy in the electric furnace, in order to reduce the electricity consumption of the electric furnace and the electricity consumption of the electrode, the work efficiency of the electric furnace is enhanced, and the economic benefit is increased.
Description
Affiliated technical field
The utility model relates to ferrous metallurgy, is specifically related to novel smelting steel in ultrahigh-power electric furnace furnace wall carbonyl spray gun.
Background technology
Aggravation along with domestic and international metallurgy industry competition, improve the short flow process of electric furnace steel mill competitive power and become urgent day by day problem, must improve the production efficiency of weak point flow process steel mill for this reason, key is further to shorten the electrosmelting time, main path is the input that improves electric energy, physical energy and chemical energy, reduces thermosteresis to shorten conduction time and to reduce stoppage time.
A trend of electric furnace development is to widely apply chemical energy, has developed the reinforcement oxygen technology that uhp electric arc furnace is smelted for this reason.Many electric furnaces are installed supersonic speed oxygen rifle, carbonyl spray gun, oxygen burner and are used secondary burning technology, a large amount of input chemical energy sources, make the electrosmelting cycle shorten greatly, power consumption and consumption of electrode constantly reduce, but find that through secular smelting practice common supersonic speed water-cooled C-O spray gun winding-up distance is short, air supply intensity is low, and oxygen point is single; Many water-cooled supersonic speed oxygen rifles are installed near the fire door, insert from fire door during oxygen blast, and complicated operation, fire door can not be closed, and labor strength is big; Though the oxygen oil burner is installed on the furnace wall, burner flame is short, installation site height, blowing weak effect.
Summary of the invention
For overcoming the shortcoming and the better application secondary burning technology of conventional oven door and furnace wall supersonic speed oxygen rifle, carbonyl spray gun, oxygen burner, the utility model provides a kind of novel smelting steel in ultrahigh-power electric furnace furnace wall carbonyl spray gun, this carbonyl spray gun can be incorporated into chemical energy in the electric furnace effectively and go, thereby reduce energy consumption of electric furnace and consumption of electrode, improve the electric furnace working efficiency.
Technical solution of the present utility model is: this carbonyl spray gun combines oxygen rifle and carbon rifle; all be installed in the water-cooling copper box; the copper case is installed in the top of furnace wall fire brick layer; be on the cylindrical surface on the hot surface table basis of its anterior face and refractory brick; oxygen rifle and carbon rifle are more near the molten bath; the oxygen rifle comprises supersonic speed oxygen jet and epoxy nozzle; around supersonic speed master oxygen flow, add a circle protection air-flow; reduce dispersing of supersonic speed oxygen flow, make it on longer distance, to keep the fast state of collection.
Theoretical investigation shows that under the situation without any the protection air-flow, the supersonic speed Oxygen Flow only keeps the boundling shape in short period of time or short range; uncontrolledly disperse then to all directions; the convergency of oxygen flow reduces, and its speed and penetrativity reduce, and oxygen utilization rate descends.The main oxygen stream of cluster fluidic oxygen gun of the present utility model nozzle center points to the molten bath, is used for the molten steel decarburization.Around supersonic speed main oxygen stream, add circling gas flow; if no Sweet natural gas then can add circling gas flow (epoxy); make gas-flow or epoxy stream flow the big envelope provide protection to main oxygen; main oxygen stream just can keep the boundling state on long distance like this; thereby possess powerful penetrativity, the effect of agitation molten pool is strengthened, and has obviously increased the contact area of oxygen and molten steel; improve the dynamic conditions of steel-making chemical reaction, improved the utilization ratio of oxygen.Epoxy is protected the main oxygen stream except that being used for, and secondary combustion oxygen also is provided, and promptly is used for the CO after burning.
Theoretical investigation also proves; even used around the protection air-flow; leave the increase of nozzle distance along with oxygen; oxygen gas flow rate and penetrativity still can reduce; therefore, also be necessary to shorten the distance of nozzle, keep a good angle of penetration simultaneously to the molten bath; this principle is equally applicable to efficiently spray carbon, promptly sprays carbon and also is necessary near the molten bath and keeps a relative steeper angle.For reaching this purpose, oxygen rifle of the present utility model and spray gun all are installed in the copper water-cooled case, and the design of copper case has the long life-span, and fabulous cooling can be provided, and can bear steel scrap and impact.The copper case is installed in the top of furnace wall fire brick layer, the hot surface of its anterior face and refractory brick is on the cylindrical surface basically, such design has solved common fixed oxygen rifle and carbon rifle well apart from a liquid level main difficult problem far away, make oxygen rifle and carbon rifle shorter, and spray angle is more reasonable apart from the molten bath.
The utility model uses cluster fluidic, water-cooling copper box to realize shorter jet length, improves oxygen supply intensity and oxygen utilization rate, makes good foamy slag; Strengthen to stir, accelerate decarbonization rate, make temperature in the stove, composition more even.
Description of drawings
Fig. 1 installs electric furnace sidewall profile figure for the utility model
Fig. 2 installs oxygen rifle synoptic diagram for the utility model water tank
Among the figure: 1 supersonic speed oxygen rifle, 2 protection epoxy rifles, 3 water-cooled casees water supply (backwater) mouth, 4 carbon jetting guns, 5 water-cooled casees, refractory brick top, 6 furnace wall, 7 oxygen rifles
Embodiment
Steel 70 tons of electric furnaces in Huaihe River are introduced from Italian Danieli Off Mecc, and transformer efficiency (AC) is 60 ± 20%MVA, are equipped with MORE type fire door water-cooled supersonic speed oxygen rifle (2500Nm
3/ h) 1, MORE type furnace wall oxygen oil burner (oxygen flow 3 * 800Nm
3/ h) 3, spray carbon system 1 cover, a year designed productive capacity is 300,000 tons.After going into operation in 95 years, the Huaihe River steel has carried out a series of technological transformation to 70 tons of electric furnaces, adopt technologies such as liquid iron charging, low purity oxygen steel-making and secondary combustion, improved the throughput of electric furnace greatly, calendar year 2001, actual product steel reached 660,000 tons, the electric furnace electric power consumption per ton steel drops to below 300 degree, and tap to tap time is about 50 minutes.For further reducing energy consumption of electric furnace and consumption of electrode, shorten the heat, solve the high palpus of electric furnace carbon power failure decarburization, cause problems such as big splash easily, the Huaihe River steel has been developed novel smelting steel in ultrahigh-power electric furnace furnace wall carbonyl spray gun, replaces electric furnace MORE type fire door oxygen rifle and furnace wall burner.
Around 70 tons of electric stove walls the novel smelting steel in ultrahigh-power electric furnace of 3 covers furnace wall carbonyl spray gun is installed, 1# and 2# furnace wall carbonyl spray gun system are by 3000Nm
3The oxygen supply of/hVPSA oxygenerator group, 3# furnace wall carbon oxygen spray system is by a cover 2 * 1000Nm
3The oxygen supply of/h deep cooling oxygenerator group.
The novel smelting steel in ultrahigh-power electric furnace of every cover all includes cluster oxygen ejection gun 7, carbon jetting gun 4 and water-cooling copper box 5 with the furnace wall carbonyl spray gun.The cluster oxygen ejection gun 7 of Huaihe River steel design comprises supersonic speed oxygen jet 1 and circulation oxygen nozzle 2, the Sweet natural gas of use arranged and do not use two kinds of Sweet natural gases, and by using a combustion chamber to mix and spray two bursts of Oxygen Flow in the oxygen rifle, thus assurance generation cluster fluidic.When the supersonic speed oxygen jet with 2 Mach the velocity of sound during to the molten bath oxygen supply, circulation oxygen is with maximum 8Nm
3The speed of/mih is protected Supersonic rapid fire oxygen flow, and secondary combustion oxygen is provided simultaneously.The Huaihe River steel does not have gas source temporarily, can't use gas-flow protection main oxygen stream, but that the gas valve station has installed is stand-by.
Every novel smelting steel in ultrahigh-power electric furnace also has a carbon jetting gun with the furnace wall carbonyl spray gun, is arranged in the lower right of cluster oxygen ejection gun, and this being arranged in parallel helps the quick formation of foamy slag and prevent that spray orifice from stopping up.
Cluster oxygen ejection gun and carbon jetting gun all are contained in the water-cooling copper box, are subjected to the protection of copper case.The copper case is installed in the top apart from the anti-material in furnace wall of the about 0.6-0.75 rice of liquid steel level, angle of declination to the stove center is the 43-45 degree, both guaranteed that jet length was the shortest, reduced splash again to greatest extent, simultaneously because the cooling effect of water-cooling copper box, make that the etch rates of anti-material the below the copper case slows down.
Be equipped with oxygen/gas control valve station 1 cover, provide independent control, be equipped with all necessary devices of keeping the safety in production the gas-flow and the Oxygen Flow of each cluster oxygen ejection gun.
The combined type operation control system is equipped with a siemens S7-400PLC, can be according to the variation of input electric energy in the stove, different oxygen flow and spray carbon amounts is provided, schedule of operation is considered steelshop maximum oxygen flow and potential limited field, change according to burden structure and steel grade, and the blowing oxygen quantity difference that needs, different operator schemes be provided with, carry out man-machine dialogue by indicating meter, can select operation and manual operation automatically.
Compare novel furnace wall carbonyl spray gun with conventional oven door with furnace wall supersonic speed oxygen rifle, carbonyl spray gun, oxygen burner and have following series of advantages:
(1) use multiple spot oxygen supply spray carbon and shorter jet length in cluster fluidic, the stove, oxygen supply intensity increases, the quick melting waste steel of electric furnace, and decarburization and dephosphorizing capacity strengthen, and are specially adapted to liquid iron charging, and smelt the higher steel grade of carbon content.
(2) because three oxygen rifle uniform distribution, temperature in the stove, composition are more even, and the slag splash significantly reduces, and bell steel bonding phenomenon is improved greatly; Good foam slag burialing arc has reduced the arc heat radiation, has reduced the consumption of water-cooled part.
(3) the close molten bath of spray carbon, and capable with the main oxygen levelling, can stably make good foamy slag, reduce the loss of carbon, improve recovery rate of iron.
(4) realize closing the fire door operation, the cold wind that stove gate sucks is few, reduces calorific loss; Compare with original MORE type oxygen rifle, reduced the labor capacity in cold steel, cold slag and fire door zone that cleaning oxygen rifle attaches; Because novel furnace wall carbonyl spray gun fixedly is loaded on the furnace wall, a lot of mechanicalness maintenances of former oxygen rifle reduce, and save maintenance cost.
(5) steel 70 tons of electric furnaces in Huaihe River are installed novel furnace wall carbonyl spray gun, the electric furnace each economic target further improves, average index is compared before using novel furnace wall carbonyl spray gun and using, smelting cycle shortens 3-6 minute, energy consumption of electric furnace reduces about 30Kwh/t, consumption of electrode has reduced 0.4kg/t, realizes 1,200 ten thousand yuan of year economic benefits.Use the contrast of novel furnace wall carbonyl spray gun and MORE type oxygen rifle index to see Table 1.
Table 1 uses novel furnace wall carbonyl spray gun and the contrast of MORE type oxygen rifle index
The novel furnace wall of index MORE type oxygen changes
Rifle is the oxygen rifle
*
The mean power input, MW 43.6 47.4+3.8
Conduction time, min 33-36 30-33-3～-5
Tapping---45-54 42-50-3～-6 during tapping
Between, min
Power consumption, Kwh/t 295 265-30
Consumption of electrode, Kg/t 1.8 1.4-0.4
Oxygen depletion, Nm
3/ t 32 39+7
Spray carbon amount, Kg/t 2 5+3
Fuel oil consumption, Kg/t 3 0-3
Secondary side voltage, V 410-440 420-460+10～+ 20
Recovery rate, % 90 90.5+0.5
Claims (3)
1, novel smelting steel in ultrahigh-power electric furnace furnace wall carbonyl spray gun, it is characterized in that: this carbonyl spray gun is compound cluster oxygen ejection gun (7) and carbon jetting gun (4), carbon jetting gun (4) is arranged in parallel in the lower right of cluster oxygen ejection gun (7), and oxygen rifle (7) and carbon rifle (4) all are installed in the water-cooled case (5).
2, novel smelting steel in ultrahigh-power electric furnace furnace wall carbonyl spray gun according to claim 1 is characterized in that: oxygen rifle (7) includes supersonic speed oxygen rifle (1) and epoxy rifle (2).
3, novel smelting steel in ultrahigh-power electric furnace furnace wall carbonyl spray gun according to claim 1 is characterized in that: water-cooled case (5) is installed in the top (6) of furnace wall fire brick layer and locates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320123669 CN2673879Y (en) | 2003-12-31 | 2003-12-31 | Furnace wall carbon oxygen spray gun for novel super high power electric steel-smelting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320123669 CN2673879Y (en) | 2003-12-31 | 2003-12-31 | Furnace wall carbon oxygen spray gun for novel super high power electric steel-smelting furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2673879Y true CN2673879Y (en) | 2005-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320123669 Expired - Fee Related CN2673879Y (en) | 2003-12-31 | 2003-12-31 | Furnace wall carbon oxygen spray gun for novel super high power electric steel-smelting furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN2673879Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107214009A (en) * | 2017-07-11 | 2017-09-29 | 云汇环保科技南通有限公司 | A kind of fast fluidic oxygen gun of ultrahigh frequency |
| CN107636174A (en) * | 2015-04-08 | 2018-01-26 | Sms集团有限责任公司 | Converter |
| CN111378809A (en) * | 2020-05-06 | 2020-07-07 | 江苏必瑞驰科技有限公司 | Equipment and method for electric arc furnace steelmaking by using oxygen combustion lance |
| CN113832292A (en) * | 2021-09-03 | 2021-12-24 | 张家港宏昌钢板有限公司 | Method for optimizing function of oxygen lance on side wall of electric furnace |
-
2003
- 2003-12-31 CN CN 200320123669 patent/CN2673879Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636174A (en) * | 2015-04-08 | 2018-01-26 | Sms集团有限责任公司 | Converter |
| CN107636174B (en) * | 2015-04-08 | 2019-12-27 | Sms集团有限责任公司 | Converter |
| CN107214009A (en) * | 2017-07-11 | 2017-09-29 | 云汇环保科技南通有限公司 | A kind of fast fluidic oxygen gun of ultrahigh frequency |
| CN111378809A (en) * | 2020-05-06 | 2020-07-07 | 江苏必瑞驰科技有限公司 | Equipment and method for electric arc furnace steelmaking by using oxygen combustion lance |
| CN113832292A (en) * | 2021-09-03 | 2021-12-24 | 张家港宏昌钢板有限公司 | Method for optimizing function of oxygen lance on side wall of electric furnace |
| CN113832292B (en) * | 2021-09-03 | 2022-12-02 | 张家港宏昌钢板有限公司 | Method for optimizing function of oxygen lance on side wall of electric furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |