CN1148460C - Spraygun for splashing slags to protect converter and its splashing method - Google Patents
Spraygun for splashing slags to protect converter and its splashing method Download PDFInfo
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- CN1148460C CN1148460C CNB001062972A CN00106297A CN1148460C CN 1148460 C CN1148460 C CN 1148460C CN B001062972 A CNB001062972 A CN B001062972A CN 00106297 A CN00106297 A CN 00106297A CN 1148460 C CN1148460 C CN 1148460C
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- spray
- shower nozzle
- converter
- nitrogen
- slag
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Abstract
The present invention belongs to the technical field of the steel making of a converter, which is mainly suitable for splashing slag to protect a converter after the large-size converter tops steel. The spray gun of the present invention is composed of a spray pipe and a spray head, wherein the spray pipe is composed of an outer sleeve pipe, an intermediate water pipe and a nitrogen inner pipe; the spray head is in an integral structure, and comprises an outer wall, a cooling water wall, an air chamber and 6 spray holes, the spray pipe is correspondingly connected with the spray head. After the converter taps the steel, a slag adjusting material is added, nitrogen is immediately blown, and then slag is splashed to protect the converter. The slag adjusting material is composed of soft-burning magnesium balls and soft-burning dolomite, the addition of the slag adjusting material is from 1 to 2 kg/T steel, and the total flow of the nitrogen is from 820 to 850Nm<3>/min. The outlet velocity of the nitrogen is greater than 530 m/s.
Description
Technical field
The invention belongs to the converter steelmaking field.Mainly be applicable to the slag splashing of mammoth conveter.
Background technology
During converter steelmaking, owing to be subjected to the erosion and the impact of molten steel and slag liquid, its furnace lining is subjected to serious erosion, therefore, after tapping, often needs furnace lining is repaired, and normally adopts Gunning refractory or tar, the dolomite brick raw material as fettling.The repairing of converter lining has not only consumed a large amount of refractory materialss, reduces converter productivity, but also needs to consume heavy manual work.
For this reason, developed converter protecting method with splash slag in recent years in the world.This method is to stay the part finishing slag behind converter tapping; and add an amount of slag supplying agent; make slag have suitable viscosity and refractoriness; again with the oxygen rifle to the slag high pressure nitrogen of jetting; impact slag; slag is splashed on the furnace lining, forms the erosion-resistant protective layer of one deck, reach the purpose of protection furnace lining on the furnace lining surface.
In the prior art, adopt steel making oxygen lance to the slag high pressure nitrogen of jetting, there are the following problems to carry out slag splashing:
(1) on mammoth conveter, when adopting the steel-making oxygen lance spraying to blow high pressure nitrogen to carry out slag splashing, the frequent thick dry slag of bonding 20-30mm in oxygen rifle end and on the gun barrel of upper part, and contain the part iron shot in the dry slag, during next stove steel-making, oxygen enters the gap of dry slag and rifle body, iron shot in the dry slag and oxygen effect and burn, localized hyperthermia can make the fusing of oxygen gun barrel wall and leak, and need change gun barrel and shower nozzle at once, both influenced production, also be absolutely unsafe.
(2) steel-making oxygen rifle is because nozzle structure is limit, and the jet character that nitrogen produced of winding-up can not satisfy the requirement of slag splashing, and in addition, the nitrogen amount that is consumed is also big, the cost height.
(3) steel-making oxygen rifle is short work-ing life, generally is no more than 20 stoves.
(4) existing oxygen lance blow head has only 5 spray orifices, and one of them is at the center, and 4 are evenly distributed on periphery by 90 ° of angles in addition.Center of orifices vertical impact slag, spatter the effect of slag toward the furnace wall relatively poor, and the spray orifice that effectively spatters slag on the furnace wall has only 4, makes that the homogeneity of dross is affected on the furnace wall.
Summary of the invention
The object of the present invention is to provide a kind of nitrogen jet current character can satisfy service requirements, and the low splashing slag in converter of spray gun long service life and nitrogen consumption is with spray gun and spray method.
At above-mentioned purpose, the present invention adopts following technical scheme:
Splashing slag in converter of the present invention is made up of pipe connecting and shower nozzle two portions with spray gun, and both are welded to connect in employing.Pipe connecting comprises that pipe is formed in outer tube (gun barrel), middle level water pipe and the nitrogen.Shower nozzle is an one-piece construction, and it comprises outer wall, water coolant wall, air chamber, spray orifice and water eliminator.The outer tube of shower nozzle outer wall and pipe connecting joins, and pipe joins in the air chamber of shower nozzle and the nitrogen of pipe connecting, and the water coolant wall of shower nozzle and the middle level water pipe of pipe connecting join, and water eliminator is within the cooling-water duct of shower nozzle.
Shower nozzle contains 6 spray orifices, and they are evenly distributed in the periphery of shower nozzle end, and angle is 60 ° between two adjacent spray orifices, and spray orifice is the Lavalle pass, exit diameter φ
1Be 52-57mm, throat diameter φ
2Be 38-44mm, the angle α of the central axis of each spray orifice and the central axis of spray gun is 10-15 °.
The concrete operations step and the parameter of splashing slag in converter spray method of the present invention are as follows:
It is to carry out with interior in 1 minute behind converter tapping that slag is spattered in converter, when converter tapping finishes, the extraction of oxygen rifle is come out of the stove, to spatter the residue adjustment material that slag uses rapidly adds in the converter, insert in the converter with being about to spatter the special-purpose spray gun of slag, the spray gun shower nozzle highly is a 2.0-2.5 rice apart from the rifle position of furnace bottom bottom, behind the spray gun location, begin to utilize spray gun nitrogen-blow in stove, the total flux of 6 spray orifice nitrogen-blows is 820-850Nm
3/ min, at spray nozzle, the velocity of discharge＞530m/s of nitrogen jet current, splash time 3-5min.The thickness of slag layer that spatters that the converter furnace wall is hung is 18-25mm.
The proportioning of described residue adjustment material (weight %) is: calcined magnesite ball 10-15%, light dolomite 85-90%;
Wherein the chemical ingredients of calcined magnesite ball (weight %) is: MgO 65-72%, CaO 1.0-1.5%, SiO
24.0-6.0%, Al
2O
31.0-2.0%, Fe
2O
3≤ 1.5%, alkali 20-24.0% burns;
The chemical ingredients of light dolomite (weight %) is: MgO 34-38%, CaO 54-58%, SiO
25.5-6.5%, Al
2O
31.0-2.0%, Fe
2O
3≤ 1.5%, alkali 1.0-1.3% burns;
The add-on of residue adjustment material is 1-2 kilogram/ton steel (a converter tonnage).Usually, still leave the part recrement behind the converter tapping.
Compared with prior art, the present invention has following advantage:
(1) 6 of shower nozzle of the present invention spray orifices are evenly distributed in the shower nozzle periphery, the wide coverage of nitrogen jet current, can with furnace retaining residue adjustment material effectively equably splash to converter lining everywhere.
(2) the Mach number height (M=2.05-2.4) in spray orifice of the present invention exit, nitrogen jet current speed is big, and the jet exit momentum is big, can improve splash effect and splash speed greatly, shortens the whole splash time, increases work efficiency.
(3) the present invention is because sprinkler design is reasonable, and nitrogen flow is little, can save nitrogen, reduces cost.
(4) because the present invention will make steel the oxygen rifle and separate use with the slag splashing spray gun, so spray gun end institute agglutinating slag can come off in the natural cooling process after the splash end voluntarily, the rifle body can not take place burn accident.
(5) spray gun long service life, its rifle age is above 2000 times.
Description of drawings
Now in conjunction with the accompanying drawings, the invention will be further described.
Accompanying drawing 1 is the structural representation of splashing slag in converter of the present invention with spray gun.
Accompanying drawing 2 is cross section (C-C section) synoptic diagram of spray gun shower nozzle.
Embodiment
By finding out among the figure, splashing slag in converter of the present invention is made up of pipe connecting 2 and red copper shower nozzle 1 with spray gun, and both are welded to connect in employing.Pipe connecting 2 is made up of pipe 8 in outer tube 6 (gun barrel), middle level water pipe 7 and the nitrogen.Shower nozzle 1 is an one-piece construction, and it comprises outer wall 3, water coolant wall 4, air chamber 5, spray orifice 11, stiffening web 12 and water eliminator 10.The outer wall 3 of shower nozzle joins with the outer tube 6 of pipe connecting, and the air chamber 5 of shower nozzle joins with the interior pipe 8 of the nitrogen of pipe connecting, and the water coolant wall 4 of shower nozzle slides with the middle level water pipe of pipe connecting 7 and joins.Water eliminator 10 is within the cooling-water duct 13 of shower nozzle.12 is stiffening web among the figure, and 14 is the wire of pipe connecting 2 and red copper shower nozzle 1.
Shower nozzle has 6 spray orifices 11, is evenly distributed on the shower nozzle end, and the angle between two adjacent spray orifices is 60 °, and in shower nozzle, the periphery of each spray orifice all has cooling-water duct 13.The air chamber 5 of shower nozzle directly communicates with 6 spray orifices.Spray orifice is the Lavalle pass, the exit diameter phi
1Bigger, φ
1Be 52-57mm, throat diameter φ
2Be 38-44mm, the angle α of the central axis of each spray orifice and the central axis of spray gun is 10-15 °.
Embodiment
Adopt splashing slag in converter of the present invention with spray gun and spray method thereof, in 300 tons converter, implemented the test of 3 stove slag splashings.The relevant structural parameter of institute's employing spray gun are as shown in table 1 in the test.After the tapping of 3 stove steel, leave the part recrement, spray gun of the present invention is inserted in the stove locate, the residue adjustment material is added in the stove, begin nitrogen-blow immediately and spatter slag.
In the test of every stove, the investigation material composition of finishing slag amount, adding and add-on, nitrogen consumption, rifle position height and to spatter the spray time as shown in table 2.Final slag composition, to spatter thickness of slag layer, backup lining brick consumption, mending material consumption and converter operating rate as shown in table 3.
In order to contrast, in same body of heater, under the similarity condition, adopt steel-making oxygen rifle as the slag splashing spray gun, carried out a stove slag splashing and tested, its have related parameter also example gone in the corresponding table.
The structural parameter of table 1 embodiment and Comparative Examples spray gun
Table 2 embodiment and Comparative Examples spray gun splash parameter
The proportioning (Wt%) of table 3 embodiment residue adjustment material
The chemical ingredients (wt%) of calcined magnesite ball and light dolomite in the table 4 residue adjustment material
| The composition heat (batch) number | MgO | ?CaO | ?SiO 2 | ?Al 2O 3 | ?Fe 2O 3 | Alkali burns | |
| 1 | Calcined magnesite ball | 68.6 | ?1.2 | ?5.4 | ?1.60 | ?23.2 | |
| Light dolomite | 35.0 | ?55.5 | ?5.8 | ?1.70 | ?1.0 | ?1.0 | |
| ?2 | Calcined magnesite ball | 70.1 | ?1.3 | ?4.8 | ?1.41 | ?1.0 | ?21.39 |
| Light dolomite | 37.0 | ?54.8 | ?6.0 | ?1.0 | ?1.2 | ||
| ?3 | Calcined magnesite ball | 66.9 | ?1.4 | ?5.9 | ?1.?8 | ?1.1 | ?22.9 |
| Light dolomite | 37.2 | ?54.4 | ?5.8 | ?1.5 | ?1.1 | ||
Table 5 embodiment and the winding-up of Comparative Examples spray gun be index as a result
Claims (3)
1, a kind of splashing slag in converter spray gun is made up of pipe connecting (2) and shower nozzle (1), and both are welded to connect in employing, and pipe connecting (2) is made up of pipe (8) in outer tube (6), middle level water pipe (7) and the nitrogen; Shower nozzle (1) is an one-piece construction, and it comprises outer wall (3), water coolant wall (4), air chamber (5), spray orifice (11); The outer wall of shower nozzle (3) joins with the outer tube (6) of pipe connecting, and the air chamber of shower nozzle (5) joins with the interior pipe of nitrogen (8) of pipe connecting, and the water coolant wall (4) of shower nozzle joins with the middle level water pipe (7) of pipe connecting; It is characterized in that:
Shower nozzle (1) contains 6 spray orifices (11), and they are evenly distributed in the periphery of shower nozzle end, and the angle between two adjacent spray orifices is 60 °, and the air chamber of shower nozzle (5) directly communicates with 6 spray orifices; Spray orifice is the Lavalle pass, the exit diameter phi
1Be 52-57mm, throat diameter φ
2Be 38-44mm, the angle α of the central axis of each spray orifice and the central axis of spray gun is 10-15 °.
2, spray gun according to claim 1 is characterized in that being provided with water eliminator (10) within the cooling-water duct (13) at shower nozzle.
3. one kind is utilized the described spray gun of claim 1, carries out the spray method of splashing slag in converter, when converter tapping, leaves the part recrement, after the tapping, adds the residue adjustment material, and nitrogen-blow carries out slag splashing immediately, it is characterized in that:
(1) behind the converter tapping, rapidly the oxygen rifle is extracted out, the described spray gun of claim 1 is inserted in the stove, the location of spray gun in stove highly is 2.0-2.5m;
(2) proportioning of residue adjustment material (wt%) is: calcined magnesite ball 10-15%, light dolomite 85-90%;
Wherein the chemical ingredients of calcined magnesite ball (wt%) is: MgO 65-72%, CaO 1.0-1.5%, SiO
24.0-6.0%, Al
2O
31.0-2.0%, Fe
2O
3≤ 1.5%, alkali 20-24.0% burns;
The chemical ingredients of light dolomite (wt%) is: MgO 34-38%, CaO 54-58%, SiO
25.5-6.5%, Al
2O
31.0-2.0%, Fe
2O
3≤ 1.5%, alkali 1.0-1.3% burns;
(3) add-on of residue adjustment material is the 1-2Kg/t steel;
(4) total flux of 6 spray orifice nitrogen-blows of shower nozzle is 820-850Nm
3/ min;
(5) velocity of discharge＞530m/s of nitrogen jet current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001062972A CN1148460C (en) | 2000-05-10 | 2000-05-10 | Spraygun for splashing slags to protect converter and its splashing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001062972A CN1148460C (en) | 2000-05-10 | 2000-05-10 | Spraygun for splashing slags to protect converter and its splashing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1274011A CN1274011A (en) | 2000-11-22 |
| CN1148460C true CN1148460C (en) | 2004-05-05 |
Family
ID=4578264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001062972A Expired - Fee Related CN1148460C (en) | 2000-05-10 | 2000-05-10 | Spraygun for splashing slags to protect converter and its splashing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1148460C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107034336A (en) * | 2017-05-23 | 2017-08-11 | 钢铁研究总院 | It is a kind of to improve the device and method that slag effect is splashed in converter |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977617A (en) * | 2018-09-03 | 2018-12-11 | 南京钢铁股份有限公司 | One kind scrubbing clinker cross-drilled hole oxygen rifle and its brushing method |
| CN111187873A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Molten steel smelting method of large converter |
-
2000
- 2000-05-10 CN CNB001062972A patent/CN1148460C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107034336A (en) * | 2017-05-23 | 2017-08-11 | 钢铁研究总院 | It is a kind of to improve the device and method that slag effect is splashed in converter |
| CN107034336B (en) * | 2017-05-23 | 2019-02-01 | 钢铁研究总院 | A kind of device and method for improving converter and splashing slag effect |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1274011A (en) | 2000-11-22 |
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