CN110218842A - A kind of dephosphorization of molten iron device and method - Google Patents
A kind of dephosphorization of molten iron device and method Download PDFInfo
- Publication number
- CN110218842A CN110218842A CN201910587581.6A CN201910587581A CN110218842A CN 110218842 A CN110218842 A CN 110218842A CN 201910587581 A CN201910587581 A CN 201910587581A CN 110218842 A CN110218842 A CN 110218842A
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- China
- Prior art keywords
- spray head
- gun body
- spray
- water inlet
- dephosphorization
- Prior art date
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007921 spray Substances 0.000 claims abstract description 201
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 210000000476 body water Anatomy 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000004886 process control Methods 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims 1
- 238000001727 in vivo Methods 0.000 claims 1
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- -1 temperature Chemical compound 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 241000071123 Ectopleura larynx Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of dephosphorization of molten iron device and methods, belong to iron and steel smelting technology field.The present invention includes gun body assembly and spray head assembly, the gun body assembly is made of gun body inner tube, gun body intermediate tube, gun body water inlet pipe and gun body return pipe, spray head assembly is made of head body, spray head return pipe, spray head water inlet pipe, spray head intermediate tube, spray head inner tube, the spray head upper end of inner tube is connected to gun body inner tube, spray head intermediate tube upper end is connected to gun body intermediate tube, the upper end of spray head water inlet pipe is connected to gun body water inlet pipe, the upper end of spray head return pipe is connected to gun body return pipe, and the inner cavity of head body is equipped with cooling water channel, outer spray orifice and internal spray hole.The present invention has two sets of independent air supply channels, i.e. oxygen, channel of nitrogen and corresponding Lavalle spray orifice, can be realized nitrogen, oxygen under the conditions of lower top oxygen supply intensity and mixes and blow, improves converter molten pool overhead power condition, realize efficient, low consumption, environmentally friendly dephosphorization purpose.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, more specifically to a kind of dephosphorization of molten iron device and method.
Background technique
Phosphorus is the harmful element in most steel, is easy to cause black brittleness and temper brittleness in cyrystal boundary segregation, is suitable
The raising and the extremely low phosphoretic steel market demand, dephosphorization of molten iron for answering raw material phosphorus content are come into being.Dephosphorization of molten iron processing can be divided into oxygen
Change two kinds of techniques of dephosphorization and dephosphorization under reducing atmosphere, currently, each steel mill generallys use dephosphorization under oxidizing atmosphere method.Common dephosphorization technology be divided to two greatly
Class: one is dephosphorization is carried out in hot-metal bottle or fish torpedo ladle, another kind carries out dephosphorization of molten iron processing, both methods in converter
Be primarily present following problem: when carrying out dephosphorization in hot-metal bottle or fish torpedo ladle, the treatment process quantity of slag is big, and iron loss is high, and temperature drop is big, if
When carrying out temperature-compensating using oxygen blast, splash is serious and the processing time is long, seriously polluted, influences to produce direct motion, application situation is not
It is ideal.When carrying out the pre- dephosphorization treatment of molten iron in converter, converter two-step method process for making is generallyd use, i.e., a block converter is as iron
Water dephosphorization furnace, another converter is as decarbonizing furnace.Dephosphorization of molten iron furnace uses top-bottom blowing mode, using strong bottom blowing, the weak oxygen supply of top gun
Mode carries out dephosphorization operation, and because top gun oxygen flow is small, converter molten pool overhead power condition is poor, and molten bath top steel scrap is difficult to melt
Change, the duration of heat is partially long, and iron loss is bigger than normal, and it is relatively more that terminal P deviates equilibrium valve.
Summary of the invention
1. technical problems to be solved by the inivention
In view of the defects existing in the prior art with deficiency, the present invention provides a kind of dephosphorization of molten iron device and method, this hairs
It is bright that there are two sets of independent air supply channels, i.e. oxygen, channel of nitrogen and corresponding Lavalle spray orifice, it can be realized strong in the oxygen supply of lower top
Nitrogen, oxygen are mixed under the conditions of degree blows, and improves converter molten pool overhead power condition, promotes process carbon, temperature, phosphorus to coordinate, realize efficient, low
Consumption, environmentally friendly dephosphorization purpose.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of dephosphorization of molten iron device of the invention, including gun body assembly and spray head assembly, the gun body assembly is by gun body
Inner tube, gun body intermediate tube, gun body water inlet pipe and gun body return pipe form, and are provided among gun body on the outside of the gun body inner tube
It manages, is provided with gun body water inlet pipe on the outside of gun body intermediate tube, gun body return pipe, the rifle are provided on the outside of gun body water inlet pipe
The lower part of body assembly is connected with spray head assembly, spray head assembly by head body, spray head return pipe, spray head water inlet pipe, spray head among
Pipe, spray head inner tube composition, the inner cavity of head body are equipped with cooling water channel, outer spray orifice, internal spray hole；
The spray head upper end of inner tube is connected to gun body inner tube, the input terminal connection nitrogen of gun body inner tube, under spray head inner tube
End is connected to the internal spray hole of head body, is spray head center line at the center of spray head inner tube, is set on the outside of the spray head inner tube
It is equipped with spray head intermediate tube, the spray head intermediate tube upper end is connected to gun body intermediate tube, and the input terminal of gun body intermediate tube connects oxygen
Gas, spray head intermediate tube lower end are connected to the outer spray orifice of head body, and spray head water inlet is provided on the outside of the spray head intermediate tube
Pipe, the upper end of spray head water inlet pipe are connected to gun body water inlet pipe, and the input terminal of gun body water inlet pipe connects external cooling water inlet pipe line,
The lower end of spray head water inlet pipe is connected to the cooling water channel of head body, is provided with spray head return water on the outside of the spray head water inlet pipe
Pipe, the upper end of spray head return pipe are connected to gun body return pipe, and gun body return pipe upper end is connected to external return piping, spray head return pipe
Lower end be connected to the cooling water channel of head body.
Further, the gun body inner tube, gun body intermediate tube, gun body water inlet pipe and gun body return pipe are concentric cylinder
Cylinder.
It further, is internal spray hole center line, internal spray hole center line and spray head center line at the center of the internal spray hole
Angle is α, and α is 0 °~15 °.
Further, the internal spray hole is equipped with 2 to 6, and exit Mach number M2=2.0~2.5, internal spray hole is in spray head sheet
Body end is spaced apart on face.
Further, the internal spray hole is equipped with one, and the internal spray hole center line of internal spray hole is overlapped with spray head center line, out
Mouth Mach number M2=2.0~2.5.
Further, the outer spray orifice is equipped with 3 to 6, and exit Mach number M1=1.2~2.2, outer spray orifice is in spray head sheet
The surface of body is spaced apart.
Further, the outer spray orifice and internal spray hole are Laval spray orifice, and by taper contraction section, nearly cylinder
Section, cone expansion section composition, outer spray orifice and internal spray hole have independent air supply channel respectively.
Further, outer orifice center line is set as at the center of the outer spray orifice, in outer orifice center line and spray head
Heart wire clamp angle is β, and β is 12 °~20 °.
A kind of dephosphorization method for molten iron, the steps include:
Step 1: frivolous steel scrap being added into converter, and additional amount is determined according to thermal balance state；
Step 2: being blended into molten iron into converter, according to BOF nominal capacity, determines converter molten iron charge weight；
Step 3: starting is stirred by force in bottom blowing；
Step 4: carrying out dephosphorization of molten iron operation, and gun body assembly and spray head assembly are inserted into converter, and spray head assembly is away from iron in furnace
Water level 1.0m-4.0m is supplied oxygen, for nitrogen operation；
Step 5: the slag making materials such as lime are added and carry out dephosphorization, lime adding amount is determined according to molten iron situation, control
R1.0-2.5, R refer to basicity, R=CaO/SiO2；
Step 6: process control converter temperature is at 1380 DEG C hereinafter, carbon content is not less than 3.5%, if temperature is excessively high or carbon
Content is lower than 3.5%；Stop exit orifice and supply oxygen operation, is only stirred for nitrogen；
Step 7: after making it, operation is completed.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, have the following beneficial effects:
The present invention has two sets of independent air supply channels, i.e. oxygen, channel of nitrogen and corresponding Bearing score using converter as reaction vessel
That spray orifice, outer spray orifice and internal spray hole are taper, and discharge performance influences significantly, to can be realized under the conditions of lower top oxygen supply intensity
Nitrogen, oxygen are mixed to be blown, and converter molten pool overhead power condition is improved, and promotes process carbon, temperature, phosphorus to coordinate, operating cost in dephosphorizing process
Reduce, dephosphorization rate significantly improves, and effectively shortens the smelting iron and steel period, realize efficiently, low consumption, environmentally friendly dephosphorization purpose.
Detailed description of the invention
Fig. 1 is overall structure figure of the invention；
Fig. 2 is gun body assembly structure chart of the invention；
Fig. 3 is spray head assembly structure chart of the invention.
In figure: 1, gun body assembly；11, gun body inner tube；12, gun body intermediate tube；13, gun body water inlet pipe；14, gun body return water
Pipe；2, spray head assembly；21, head body；211, cooling water channel；212, outer spray orifice；213, internal spray hole；22, spray head return pipe；
23, spray head water inlet pipe；24, spray head intermediate tube；25, spray head inner tube；26, spray head center line；27, internal spray hole center line；28, outer spray
Centerline hole.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples:
Embodiment 1
It can be seen that a kind of dephosphorization of molten iron device of the present embodiment, including gun body assembly 1 and spray head assembly 2 from Fig. 1-3,
Gun body assembly 1 is made of gun body inner tube 11, gun body intermediate tube 12, gun body water inlet pipe 13 and gun body return pipe 14, gun body inner tube 11,
Gun body intermediate tube 12, gun body water inlet pipe 13 and gun body return pipe 14 are concentric cylinder cylinder, gun body inner tube 11, gun body intermediate tube
12, the diameter of gun body water inlet pipe 13 and gun body return pipe 14 is denoted as Ф 4, Ф 3, Ф 2 and Ф 1, the outside of gun body inner tube 11 respectively
It is provided with gun body intermediate tube 12, the outside of gun body intermediate tube 12 is provided with gun body water inlet pipe 13, and the outside of gun body water inlet pipe 13 is set
It is equipped with gun body return pipe 14, the lower part of gun body assembly 1 is connected with spray head assembly 2, and spray head assembly 2 is returned by head body 21, spray head
Water pipe 22, spray head water inlet pipe 23, spray head intermediate tube 24, spray head inner tube 25 form, and the inner cavity of head body 21 is equipped with cooling water channel
211, outer spray orifice 212, internal spray hole 213.
Spray head return pipe 22, spray head water inlet pipe 23, spray head intermediate tube 24, spray head inner tube 25 diameter be denoted as Ф 5, Ф respectively
6, Ф 7 and Ф 8.
25 upper end of spray head inner tube is connected to gun body inner tube 11, and the input terminal of gun body inner tube 11 connects nitrogen, spray head inner tube 25
Lower end is connected to the internal spray hole 213 of head body 21, is spray head center line 26 at the center of spray head inner tube 25, spray head inner tube 25
Outside is provided with spray head intermediate tube 24, and 24 upper end of spray head intermediate tube is connected to gun body intermediate tube 12, the input of gun body intermediate tube 12
End connection oxygen, 24 lower end of spray head intermediate tube are connected to the outer spray orifice 212 of head body 21, the outside setting of spray head intermediate tube 24
There is spray head water inlet pipe 23, the upper end of spray head water inlet pipe 23 is connected to gun body water inlet pipe 13, the input terminal connection of gun body water inlet pipe 13
External cooling water inlet pipe line, the lower end of spray head water inlet pipe 23 are connected to the cooling water channel 211 of head body 21, spray head water inlet pipe
23 outside is provided with spray head return pipe 22, and the upper end of spray head return pipe 22 is connected to gun body return pipe 14, gun body return pipe 14
Upper end is connected to external return piping, and the lower end of spray head return pipe 22 is connected to the cooling water channel 211 of head body 21.
It is internal spray hole center line 27 at the center of internal spray hole 213, internal spray hole center line 27 is with 26 angle of spray head center line
α, α are 0 °~15 °, when internal spray hole 213 is equipped with one, the internal spray hole center line 27 and 26 weight of spray head center line of internal spray hole 213
Close, exit Mach number M2=2.0~2.5, when internal spray hole 213 be equipped with 2 to 6, exit Mach number M2=2.0~2.5, internal spray hole
213 are spaced apart on 21 end face of head body.
Outer spray orifice 212 be equipped with 3 to 6, exit Mach number M1=1.2~2.2, table of the outer spray orifice 212 in head body 21
Face interval distribution, outer spray orifice 212 and internal spray hole 213 are Laval spray orifice, and by taper contraction section, nearly cylindrical section, cone
Shape expansion segment composition, outer spray orifice 212 and internal spray hole 213 have independent air supply channel respectively, are set as at the center of outer spray orifice 212
Outer orifice center line 28, outer orifice center line 28 are β with 26 angle of spray head center line, and β is 12 °~20 °.
The cone expansion section diameter of outer spray orifice 212 is denoted as Ф 10, and the nearly cylindrical section diameter of outer spray orifice 212 is denoted as Ф 9, interior spray
The cone expansion section diameter in hole 213 is denoted as Ф 12, and the nearly cylindrical section diameter of internal spray hole 213 is denoted as Ф 11.
A kind of dephosphorization method for molten iron, the steps include:
Step 1: frivolous steel scrap being added into converter, and additional amount is determined according to thermal balance state；
Step 2: being blended into molten iron into converter, according to BOF nominal capacity, determines converter molten iron charge weight；
Step 3: starting is stirred by force in bottom blowing；
Step 4: carrying out dephosphorization of molten iron operation, and gun body assembly 1 and spray head assembly 2 are inserted into converter, and spray head assembly 2 is away from furnace
Interior molten iron level 1.0m-4.0m is supplied oxygen, for nitrogen operation；
Step 5: the slag making materials such as lime are added and carry out dephosphorization, lime adding amount is determined according to molten iron situation, control
R1.0-2.5, R refer to basicity, R=CaO/SiO2；
Step 6: process control converter temperature is at 1380 DEG C hereinafter, carbon content is not less than 3.5%, if temperature is excessively high or carbon
Content is lower than 3.5%；Stop exit orifice and supply oxygen operation, is only stirred for nitrogen；
Step 7: after making it, operation is completed.
According to practical operation situation, specific implementation process is as follows:
Outer spray orifice 212 sets 6, exit Mach number M1=2.05, uniformly distributed on the same circumference, nearly cylindrical section (i.e. larynx
Mouthful) diameter Ф 9=28.33mm, cone expansion section outlet diameter Ф 10=37.59mm, technique flow 16000-25000m3/ h,
Outer orifice center line 28 and 26 angle β=17.5 ° of spray head center line, internal spray hole 213 set 1, exit Mach number M2=2.20,
It is arranged on spray head center line 26, nearly cylindrical section (i.e. aditus laryngis) diameter Ф 11=53.46mm, cone expansion section outlet diameter Ф
12=75.70mm, technique flow 13000-18000m3A=0 ° of/h, internal spray hole center line 27 and 26 angle of spray head center line, spray
Head ontology 21 is by copper casting and forming, Cu content > 99.85%, Ф 1=Ф 5=406.4mm, Ф 2=Ф 6=340mm, Ф 3=Ф
7=267.4mm, Ф 4=Ф 8=168mm, wall thickness 12mm.
Gun body inner tube 11, spray head inner tube 25, internal spray hole 213 connect nitrogen, gun body intermediate tube 12, spray head intermediate tube 24, outer
Spray orifice 212 connects oxygen, and gun body water inlet pipe 13 connects external cooling water inlet pipe line, through spray head water inlet pipe 23, head body 21
Cooling water channel 211, after spray head return pipe 22, external return piping is connected by gun body return pipe 14.
Specific dephosphorization method comprising the steps of:
Job step one: frivolous steel scrap being added into converter, and additional amount 0-30t is determined with specific reference to molten iron silicon, temperature,
Actually it see the table below；
Job step two: enter furnace molten iron temperature not less than 1200 DEG C, molten iron, the amount of being blended into 290-330 are blended into converter
Ton；
Job step three: starting, bottom blowing intensity 0.20m are stirred by force in bottom blowing3/ t.min, using nitrogen gas stirring；
Job step four: when carrying out dephosphorization of molten iron operation, gun body assembly 1 and spray head assembly 2 are inserted into converter, spray head assembly
2 away from molten iron level rifle position in furnace: 2.5m is supplied oxygen, for nitrogen operation；Oxygen flow 24000m3/ h, for nitrogen flow 20000m3/h；
Job step five: the slag making materials such as lime are added and carry out dephosphorization；R=1.5 is controlled, lime adding amount see the table below；
Job step six: process control converter temperature is at 1350 DEG C hereinafter, carbon content is not less than 3.8%；
Job step seven: accumulation oxygen supply 3500-4200m3Afterwards, after phosphorus reaches target value (being not more than 0.035%), operation is complete
At.
The present invention has two sets of independent air supply channels, i.e. oxygen, channel of nitrogen and corresponding Bearing score using converter as reaction vessel
That spray orifice, outer spray orifice 212 and internal spray hole 213 are taper, and discharge performance influences significantly, to can be realized in lower top oxygen supply intensity
Under the conditions of nitrogen, oxygen is mixed blows, improve converter molten pool overhead power condition, operating cost reduction, dephosphorization rate are significant in dephosphorizing process
Improve, and effectively shorten the smelting iron and steel period, realize efficiently, low consumption, environmentally friendly dephosphorization purpose.
Schematically the present invention and embodiments thereof are described above, description is not limiting, institute in attached drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited to this.So if the common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (9)
1. a kind of dephosphorization of molten iron device, including gun body assembly (1) and spray head assembly (2), it is characterised in that: the gun body assembly
(1) it is made of gun body inner tube (11), gun body intermediate tube (12), gun body water inlet pipe (13) and gun body return pipe (14), the rifle
It is provided with gun body intermediate tube (12) on the outside of pipe (11) in vivo, gun body intermediate tube is provided with gun body water inlet pipe on the outside of (12)
(13), it is provided with gun body return pipe (14) on the outside of gun body water inlet pipe (13), the lower part of the gun body assembly (1) is connected with spray
Head assembly (2), spray head assembly (2) is by head body (21), spray head return pipe (22), spray head water inlet pipe (23), spray head intermediate tube
(24), spray head inner tube (25) forms, and the inner cavity of head body (21) is equipped with cooling water channel (211), outer spray orifice (212), internal spray hole
(213)；
Spray head inner tube (25) upper end is connected to gun body inner tube (11), and the input terminal of gun body inner tube (11) connects nitrogen, spray
Head inner tube (25) lower end is connected to the internal spray hole (213) of head body (21), is spray head center at the center of spray head inner tube (25)
Line (26) is provided with spray head intermediate tube (24) on the outside of the spray head inner tube (25), described spray head intermediate tube (24) upper end
It is connected to gun body intermediate tube (12), the input terminal of gun body intermediate tube (12) connects oxygen, spray head intermediate tube (24) lower end and spray head
The outer spray orifice (212) of ontology (21) is connected to, and is provided with spray head water inlet pipe (23), spray head on the outside of the spray head intermediate tube (24)
The upper end of water inlet pipe (23) is connected to gun body water inlet pipe (13), and the input terminal of gun body water inlet pipe (13) connects external cooling water water inlet
Pipeline, the lower end of spray head water inlet pipe (23) are connected to the cooling water channel (211) of head body (21), the spray head water inlet pipe
(23) it is provided on the outside of spray head return pipe (22), the upper end of spray head return pipe (22) is connected to gun body return pipe (14), gun body
Return pipe (14) upper end is connected to external return piping, the lower end of spray head return pipe (22) and the cooling water channel of head body (21)
(211) it is connected to.
2. a kind of dephosphorization of molten iron device according to claim 1, it is characterised in that: the gun body inner tube (11), gun body
Intermediate tube (12), gun body water inlet pipe (13) and gun body return pipe (14) are concentric cylinder cylinder.
3. a kind of dephosphorization of molten iron device according to claim 1, it is characterised in that: the center of the internal spray hole (213)
Place is internal spray hole center line (27), and internal spray hole center line (27) and spray head center line (26) angle are α, and α is 0 °~15 °.
4. a kind of dephosphorization of molten iron device according to claim 1, it is characterised in that: the internal spray hole (213) be equipped with 2 to
6, exit Mach number M2=2.0~2.5, internal spray hole (213) is spaced apart on head body (21) end face.
5. a kind of dephosphorization of molten iron device according to claim 3, it is characterised in that: the internal spray hole (213) is equipped with one
A, the internal spray hole center line (27) of internal spray hole (213) is overlapped with spray head center line (26), exit Mach number M2=2.0~2.5.
6. a kind of dephosphorization of molten iron device according to claim 1, it is characterised in that: the outer spray orifice (212) be equipped with 3 to
6, exit Mach number M1=1.2~2.2, outer spray orifice (212) is spaced apart on the surface of head body (21).
7. a kind of dephosphorization of molten iron device according to claim 1, it is characterised in that: the outer spray orifice (212) and interior spray
Hole (213) is Laval spray orifice, and is made of taper contraction section, nearly cylindrical section, cone expansion section, outer spray orifice (212)
There is independent air supply channel respectively with internal spray hole (213).
8. a kind of dephosphorization of molten iron device according to claim 1, it is characterised in that: the center of the outer spray orifice (212)
Place is set as outer orifice center line (28), and outer orifice center line (28) and spray head center line (26) angle are β, and β is 12 °~20 °.
9. a kind of dephosphorization method for molten iron, it is characterised in that: the steps include:
Step 1: frivolous steel scrap being added into converter, and additional amount is determined according to thermal balance state；
Step 2: being blended into molten iron into converter, according to BOF nominal capacity, determines converter molten iron charge weight；
Step 3: starting is stirred by force in bottom blowing；
Step 4: carrying out dephosphorization of molten iron operation, and gun body assembly (1) and spray head assembly (2) are inserted into converter, spray head assembly (2) away from
Molten iron level 1.0m-4.0m is supplied oxygen, for nitrogen operation in furnace；
Step 5: being added the slag making materials such as lime and carry out dephosphorization, and lime adding amount is determined according to molten iron situation, controls R1.0-
2.5, R refer to basicity, R=CaO/SiO2；
Step 6: process control converter temperature is at 1380 DEG C hereinafter, carbon content is not less than 3.5%, if temperature is excessively high or carbon content
Lower than 3.5%；Stop exit orifice and supply oxygen operation, is only stirred for nitrogen；
Step 7: after making it, operation is completed.
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| CN112831626A (en) * | 2021-03-30 | 2021-05-25 | 马鞍山钢铁股份有限公司 | Molten iron pretreatment feeding system |
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