CN108977620A - A kind of single channel Oxygen Lance With Secondary Combustion and its application method improving converter scrap ratio - Google Patents
A kind of single channel Oxygen Lance With Secondary Combustion and its application method improving converter scrap ratio Download PDFInfo
- Publication number
- CN108977620A CN108977620A CN201811184284.9A CN201811184284A CN108977620A CN 108977620 A CN108977620 A CN 108977620A CN 201811184284 A CN201811184284 A CN 201811184284A CN 108977620 A CN108977620 A CN 108977620A
- Authority
- CN
- China
- Prior art keywords
- oxygen
- jet orifice
- assistant
- secondary combustion
- single channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 279
- 239000001301 oxygen Substances 0.000 title claims abstract description 279
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 277
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 239000007921 spray Substances 0.000 claims abstract description 34
- 238000013461 design Methods 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 239000000498 cooling water Substances 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000002893 slag Substances 0.000 claims description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 238000009628 steelmaking Methods 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 16
- 238000010079 rubber tapping Methods 0.000 claims description 12
- 230000009191 jumping Effects 0.000 claims description 9
- 230000003028 elevating effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 description 12
- 238000006477 desulfuration reaction Methods 0.000 description 11
- 230000023556 desulfurization Effects 0.000 description 11
- 238000009491 slugging Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000002926 oxygen Chemical class 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/462—Means for handling, e.g. adjusting, changing, coupling
-
- 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
Abstract
A kind of single channel Oxygen Lance With Secondary Combustion and its application method improving converter scrap ratio, including gun body and spray head, the gun body includes by intermediate conduit, the compound steel pipe structure of intermediate circumferential weld and peripheral conduits composition, the intermediate conduit is passed through oxygen, the intermediate circumferential weld is passed through cooling water, the peripheral conduits flow out return water, the end face of the spray head is provided with main oxygen jet orifice, the side wall of the spray head is provided with assistant oxygen jet orifice, the assistant oxygen jet orifice flow accounts for the 15%~30% of total oxygen flow, the main oxygen jet orifice flow accounts for the 70%~85% of total oxygen flow, single channel Oxygen Lance With Secondary Combustion of the present invention, the main oxygen jet orifice of oxygen rifle and conventional traditional oxygen rifle design are consistent, on the basis of original spray head, open up assistant oxygen jet orifice, guaranteeing assistant oxygen jet orifice jet stream neither with the generation of main oxygen jet orifice jet stream " volume is inhaled " phenomenon again not to converter lining In the case where causing erosion, a large amount of heat is generated to heat molten steel using CO burning in the oxygen jet and furnace of assistant oxygen jet orifice injection, improves converter scrap ratio.
Description
Technical field
The invention belongs to converter steeling technology field more particularly to a kind of single channel second-time burnings for improving converter scrap ratio
Oxygen rifle and its application method.
Background technique
Currently, the ratio of China's electric steel, also less than 10%, bof process is still the main flow that China produces steel, each big steel
Converter scrap ratio is all improving energetically in enterprise.The means for commonly improving converter scrap ratio in mass production at present mainly have: steel scrap
Concurrent heating agent (coke, SiC etc.) is added in preheating, converter, but the technology that above-mentioned two class improves scrap ratio has shortcoming: Qian Zhexu
Special heating equipment is wanted, the latter often introduces the impurity such as sulphur, phosphorus and molten steel meeting nitrogen pick-up into molten steel, influences molten steel cleaning
Degree.
In convertor steelmaking process, as the coal gas of converter of byproduct, usually recycled by steel mill.If but coal gas of converter
Second-time burning utilization is carried out inside converter, then is that coal-gas recovering utilizes thermal efficiency highest, most economical method.Secondary burning oxygen
Rifle technology is a kind of compensation method for thermal that can improve pneumatic steelmaking post-combustion rate, which is in traditional pneumatic steelmaking oxygen rifle
Secondary orifices is opened up, the oxygen jet for allowing main aperture to project carries out decarburizing reaction, an oxidation in the oxygen jet and furnace projected using secondary orifices
Carbon burning generates a large amount of heat, makes full use of converter self heat relatively, and then improves converter scrap ratio.But current two
Secondary burning oxygen rifle technology has the disadvantage that 1. for dual channel Oxygen Lance With Secondary Combustion since the device is complicated, processing and manufacturing difficulty is big；And
It is high due to requiring oxygen lance lifting mechanism, cooling water system, it is difficult to be changed in traditional oxygen rifle system-based of existing converter
It makes, therefore is difficult to large-scale promotion application in mass production；2. double-current stock oxygen rifle (single channel) due to secondary orifices underfed 15%,
Second-time burning thermal compensation effect is limited, therefore it improves liquid steel temperature and increases converter scrap ratio scarce capacity；And secondary orifices outlet
Number is cooling difficult (especially secondary orifices exit region) more than the design of its entrance number, the double-current stock oxygen of this secondary orifices design
Rifle is not suitable for industrial production.
Summary of the invention
In view of the deficiencies of the prior art, the present invention designs a kind of Novel single-stream road Oxygen Lance With Secondary Combustion, in traditional oxygen rifle base
Only spray head is transformed on plinth, i.e., opens up reasonable assistant oxygen jet orifice on the basis of original spray head, and secondary based on the single channel
Burning oxygen rifle optimizes converter steelmaking process, and then effectively improves the post-combustion rate of convertor steelmaking process coal gas, increases
Enter furnace steel scrap amount, improve converter scrap ratio, reduce oxygen blow duration, shorten the converter smelting period, improves converter terminal desulfurization degree.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio, which is characterized in that described including gun body and spray head
Gun body includes the compound steel pipe structure being made of intermediate conduit, intermediate circumferential weld and peripheral conduits, and the intermediate conduit is passed through oxygen,
The intermediate circumferential weld is passed through cooling water, and the peripheral conduits flow out return water, and the end face of the spray head is provided with main oxygen jet orifice, described
The side wall of spray head is provided with assistant oxygen jet orifice, and the assistant oxygen jet orifice flow accounts for the 15%~30% of total oxygen flow, the main oxygen spray
Hole flow accounts for the 70%~85% of total oxygen flow.
Subtended angle between the main oxygen jet orifice axis and gun body axis is α, and α is set as 9 °~18 °, the assistant oxygen jet orifice
Subtended angle between gun body axis is β, and β is 2.1~2.5 times of α.
The main oxygen jet orifice and assistant oxygen jet orifice are set as 40mm~150mm in spray head axial spacing L.
The main oxygen jet orifice is set as 3~6, and the number of assistant oxygen jet orifice and main oxygen jet orifice ratio is 1.0~2.0 times.
The main oxygen jet orifice is set as conventional Laval structure, the throat diameter d of the main oxygen jet orificeLarynxFor 25mm~
45mm, main oxygen jet orifice outlet diameter d1For dLarynx1.1~1.5 times.
The assistant oxygen jet orifice is straight barrel type or jumping expanding structure, straight barrel type structure assistant oxygen jet orifice inlet diameter d2For dLarynx
0.3~0.5 times；Jumping expanding structure assistant oxygen jet orifice expansion segment diameter d3For assistant oxygen jet orifice inlet diameter d21.1~1.5
Times.
A kind of single channel Oxygen Lance With Secondary Combustion application method improving converter scrap ratio, using a kind of raising converter scrap ratio
Single channel Oxygen Lance With Secondary Combustion, include the following steps,
Step 1, after the completion of upper furnace tapping, evacuation clinker blocks tapping hole, and steel scrap is added into converter from overhead traveling crane, it
The molten iron in ladle is blended into converter afterwards；
Step 2, it is controlled, and mentioned by single channel Oxygen Lance With Secondary Combustion of the Oxygen Lance With Secondary Combustion elevating mechanism to the design
For suitably supplying oxygen pressure and flow；While sending oxygen to open to blow, first slag charge is added, additional amount is the four of the total quantity of slag of full furnace
/ tri-；
Step 3, it opens after blowing 3~4min, first slag chargeization is good, adds second batch slag charge；In converting process, it will supply oxygen
Flow and oxygen supply pressure control reinforce the stirring to converter molten pool, make molten steel composition and temperature in molten bath in reasonable range
Uniformly；When blowing, which reaches institute's steelmaking kind, to be required, rifle blow off is mentioned, the sampling of falling furnace is simultaneously tapped.
Oxygen supply pressure described in step 2 is 0.75~1.25Mpa, oxygen supply pressure be conventional oxygen supply by lance pressure 1.05~
1.25 times, oxygen flow described in step 2 is 17000~45000Nm3/ h, oxygen flow are conventional oxygen supply by lance flow
1.10~1.35 times.
Beneficial effects of the present invention,
(1) single channel Oxygen Lance With Secondary Combustion of the present invention, the main oxygen jet orifice of oxygen rifle and conventional traditional oxygen rifle design are consistent, in original
On the basis of having spray head, reasonable assistant oxygen jet orifice structure is offered, is neither sent out with main oxygen jet orifice jet stream in guarantee assistant oxygen jet orifice jet stream
In the case that raw " volume is inhaled " phenomenon does not cause erosion to converter lining again, in the oxygen jet and furnace of assistant oxygen jet orifice injection one is utilized
Oxidation carbon burning generates a large amount of heat to heat molten steel, can be added to furnace steel scrap amount, improves converter scrap ratio；The second-time burning
Oxygen rifle also helps converter steelmaking process slugging, increases oxygen supply intensity, reduces oxygen supply time, shortens the converter smelting period, and mention
High converter terminal desulfurization degree.
(2) single channel Oxygen Lance With Secondary Combustion of the present invention is not required to be transformed original gun body, only changes to oxygen lance nozzle
It makes, and secondary orifices outlet number is identical with entrance number, smaller, the body of a gun good cooling results that are passed through pipeline modification to cooling water are processed
Difficulty is small, and manufacturing cost is low.Since the oxygen flow of oxygen rifle assistant oxygen jet orifice is up to the 15%~30% of total oxygen flow, and oxygen
1.05~1.25 times that pressure is conventional oxygen rifle pressure are supplied oxygen, oxygen flow is 1.10~1.35 times of conventional oxygen rifle flow；Cause
This Oxygen Lance With Secondary Combustion can greatly improve the post-combustion rate of carbon monoxide in converter and influence the de- of oxygen rifle main oxygen hole
Carbon and the metallurgical function for splashing slag.
Detailed description of the invention
Fig. 1 is 1 single channel Oxygen Lance With Secondary Combustion I structural schematic diagram of embodiment, wherein main oxygen jet orifice number 4, secondary oxygen spray
Hole number 6, assistant oxygen jet orifice pass is straight barrel type structure；
Fig. 2 is 2 single channel Oxygen Lance With Secondary Combustion II structural schematic diagram of embodiment, wherein main oxygen jet orifice number is 4, secondary
Oxygen spray orifice number is 6, and assistant oxygen jet orifice pass is jumping expanding structure；
Fig. 3 is 3 single channel Oxygen Lance With Secondary Combustion III structural schematic diagram of embodiment, wherein main oxygen jet orifice number is 5, secondary
Oxygen spray orifice number is 8, and secondary orifices pass is straight barrel type structure；
Fig. 4 is 4 single channel Oxygen Lance With Secondary Combustion of embodiment, IV structural schematic diagram, wherein main oxygen jet orifice number is 4, secondary
Oxygen spray orifice number is 8, and assistant oxygen jet orifice pass is straight barrel type structure；
1- gun body, 2- spray head, 3- intermediate conduit, the centre 4- circumferential weld, 5- peripheral conduits, 6- main oxygen jet orifice, 7- assistant oxygen jet orifice.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio, which is characterized in that including gun body 1 and spray head 2, institute
Stating gun body 1 includes the compound steel pipe structure being made of intermediate conduit 3, intermediate circumferential weld 4 and peripheral conduits 5, and the intermediate conduit 3 is logical
Enter oxygen, the intermediate circumferential weld 4 is passed through cooling water, and the peripheral conduits 5 flow out return water, and the end face of the spray head 2 is provided with master
Oxygen spray orifice 6, the side wall of the spray head 2 are provided with assistant oxygen jet orifice 7,7 flow of assistant oxygen jet orifice account for total oxygen flow 15%~
30%, 6 flow of main oxygen jet orifice accounts for the 70%~85% of total oxygen flow.
Subtended angle between 6 axis of main oxygen jet orifice and 1 axis of gun body is α, and α is set as 9 °~18 °, the pair oxygen spray
Subtended angle between 1 axis of hole 7 and gun body is β, and β is 2.1~2.5 times of α.
The main oxygen jet orifice 6 is set as 40mm~150mm in 2 axial spacing L of spray head with assistant oxygen jet orifice 7.
The main oxygen jet orifice 6 is set as 3~6, and the number ratio of assistant oxygen jet orifice 7 and main oxygen jet orifice 6 is 1.0~2.0.
The main oxygen jet orifice 6 is set as conventional Laval structure, the throat diameter d of the main oxygen jet orifice 6LarynxFor 25mm
~45mm, 6 outlet diameter d of main oxygen jet orifice1For dLarynx1.1~1.5 times.
The assistant oxygen jet orifice 7 is straight barrel type or jumping expanding structure, 7 inlet diameter d of straight barrel type structure assistant oxygen jet orifice2For
dLarynx0.3~0.5 times；7 expansion segment diameter d of jumping expanding structure assistant oxygen jet orifice3For 7 inlet diameter d of assistant oxygen jet orifice21.1~
1.5 again.
At home respectively to I, II of the present invention, III, IV oxygen on certain steel mill 80t, 120t, 180t, 210t top and bottom combined blown converter
The metallurgical effect of rifle carries out field test, especially to using the converter steel scrap before and after this oxygen rifle to be compared to detailed comparison.
Embodiment 1
Currently, averagely entering furnace steel scrap amount using conventional common oxygen rifle in 80 tons of converters of the steel mill and being generally 8.37t, enter
Furnace steel scrap amount is lower.First slag charge being added is generally 2/3rds of total slag charge, and the slugging time is 4~6min, when oxygen supply
Between be 14.5min~15.7min, smelting endpoint desulfurization degree be 5.1%~6.3%.
As shown in Figure 1, single channel Oxygen Lance With Secondary Combustion I pair oxygen spout 7 is straight barrel type structure in the present embodiment, turn in 80t
By single channel Oxygen Lance With Secondary Combustion I application, converter steelmaking process, 6 numbers of the oxygen rifle main oxygen jet orifice are 4 on site on furnace, secondary oxygen
7 numbers of spray orifice are 6, and 6 subtended angle α of main oxygen jet orifice is 9 °, and 7 subtended angle β of assistant oxygen jet orifice is 20 °, throat diameter dLarynxFor 25mm, main oxygen spray
6 outlet diameter d of hole1For 28mm, 7 inlet diameter d of assistant oxygen jet orifice2For 10mm, main oxygen jet orifice 6 and assistant oxygen jet orifice 7 are axial in spray head 2
Spacing L is 40mm.
Be embodied as follows: after the completion of upper furnace tapping, evacuation clinker blocks tapping hole, is added from overhead traveling crane into converter
Molten iron in ladle is blended into converter later by steel scrap, and molten iron temperature is generally greater than 1300 DEG C, then by oxygen lance lifting mechanism into
Row drop rifle oxygen supply, oxygen supply pressure are 0.75~0.85Mpa, and oxygen flow is 17000~21000Nm3/ h, send oxygen open blow it is same
When, first slag charge is added, additional amount is 3/4ths of the total quantity of slag of full furnace, is opened after blowing 3~4min, first slag chargeization is good,
Add second batch slag charge.It in blowing mid-term, supplies oxygen pressure and flow is held essentially constant, guarantee that " returning dry " does not occur for clinker,
Do not generate splash；It blows latter stage, using Oxygen Lance With Secondary Combustion elevating mechanism, reduces oxygen rifle at a distance from molten bath, make molten bath molten steel
Ingredient and temperature are uniform, reinforce stirring, reduce iron content in slag, reduce iron loss；When blowing, which reaches institute's steelmaking kind, to be required, rifle is mentioned
Blow off, the sampling of falling furnace are simultaneously tapped.
Analysis is sampled to result, after single channel Oxygen Lance With Secondary Combustion I, in smelting process, oxygen blow duration shortens
For 12.2~13.5min, smelting endpoint desulfurization degree is increased to 8.9%~11.3%.Enter furnace steel scrap amount to be increased by original 8.37t
For 10.25t, enter the increase of furnace steel scrap amount:
Embodiment 2
Currently, averagely enter furnace steel scrap amount using conventional common oxygen rifle in 120 tons of converters of the steel mill and be generally 15.37t,
It is lower to enter furnace steel scrap amount.First slag charge being added is generally 2/3rds of total slag charge, and the slugging time is 4~6min, oxygen supply
Time is 13.7min~14.9min, and smelting endpoint desulfurization degree is 4.7%~5.3%.
As shown in Fig. 2, single channel Oxygen Lance With Secondary Combustion II assistant oxygen jet orifice 7 is jumping expanding structure in the present embodiment,
By single channel Oxygen Lance With Secondary Combustion II application, converter steelmaking process, 6 numbers of the oxygen rifle main oxygen jet orifice are on site in 120 tons of converters
4,7 numbers of assistant oxygen jet orifice are 6, and the subtended angle α of main oxygen jet orifice 6 is set as 15 °, and 7 subtended angle β of assistant oxygen jet orifice is 35 °, throat diameter dLarynx
For 35mm, 6 outlet diameter d of main oxygen jet orifice1For 45mm, 7 inlet diameter d of assistant oxygen jet orifice2For 14mm, jumping expansion diameter d3For
18mm, main oxygen jet orifice 6 and assistant oxygen jet orifice 7 are 80mm in 2 axial spacing L of spray head.
Be embodied as follows: after the completion of upper furnace tapping, evacuation clinker blocks tapping hole, is added from overhead traveling crane into converter
Molten iron in ladle is blended into converter later by steel scrap, and molten iron temperature is generally greater than 1300 DEG C, then by oxygen lance lifting mechanism into
Row drop rifle oxygen supply, oxygen supply pressure are 0.85~1.05Mpa, and oxygen flow is 28000~30000Nm3/ h, send oxygen open blow it is same
When, first slag charge is added, additional amount is 3/4ths of the total quantity of slag of full furnace, is opened after blowing 3~4min, first slag chargeization is good,
Add second batch slag charge.It in blowing mid-term, supplies oxygen pressure and flow is held essentially constant, guarantee that " returning dry " does not occur for clinker,
Do not generate splash；It blows latter stage, using Oxygen Lance With Secondary Combustion elevating mechanism, reduces oxygen rifle at a distance from molten bath, make molten bath molten steel
Ingredient and temperature are uniform, reinforce stirring, reduce iron content in slag, reduce iron loss；When blowing, which reaches institute's steelmaking kind, to be required, rifle is mentioned
Blow off, the sampling of falling furnace are simultaneously tapped.
Analysis is sampled to result, after the single channel Oxygen Lance With Secondary Combustion II of the design, in smelting process, oxygen blast
Time shorten to 11.8~13.2min, and smelting endpoint desulfurization degree is increased to 7.8%~8.6%, enters furnace steel scrap amount by original
It is 18.45t that 15.37t, which increases, enters the increase of furnace steel scrap amount:
Embodiment 3
Currently, averagely entering furnace steel scrap amount using conventional common oxygen rifle III in 180 tons of converters of the steel mill and being generally
It is lower to enter furnace steel scrap amount by 16.35t.First slag charge being added is generally 2/3rds of total slag charge, and the slugging time is 4~
6min.Oxygen supply time is 13.5~14.8min, and desulfurization degree is 5.7%~6.4%.
As shown in figure 3, single channel Oxygen Lance With Secondary Combustion III assistant oxygen jet orifice 7 is straight barrel type structure in the present embodiment, 180
By single channel Oxygen Lance With Secondary Combustion III application, converter steelmaking process, 6 numbers of the oxygen rifle main oxygen jet orifice are 5 on site in ton converter
A, 7 numbers of assistant oxygen jet orifice are 8, and the subtended angle α of main oxygen jet orifice 6 is set as 18 °, and 7 subtended angle β of assistant oxygen jet orifice is 40 °, throat diameter dLarynx
For 40mm, 6 outlet diameter d of main oxygen jet orifice1For 50mm, 7 inlet diameter d of assistant oxygen jet orifice2For 20mm, main oxygen jet orifice 6 and assistant oxygen jet orifice
72 axial spacing L of spray head be 100mm.
Be embodied as follows: after the completion of upper furnace tapping, evacuation clinker blocks tapping hole, is added from overhead traveling crane into converter
Molten iron in ladle is blended into converter later by steel scrap, and molten iron temperature is generally greater than 1300 DEG C, then by oxygen lance lifting mechanism into
Row drop rifle oxygen supply, oxygen supply pressure are 0.95~1.15Mpa, and oxygen flow is 29600~32500Nm3/ h, send oxygen open blow it is same
When, first slag charge is added, additional amount is 3/4ths of the total quantity of slag of full furnace, is opened after blowing 3~4min, first slag chargeization is good,
Add second batch slag charge.It in blowing mid-term, supplies oxygen pressure and flow is held essentially constant, guarantee that " returning dry " does not occur for clinker,
Do not generate splash；It blows latter stage, using Oxygen Lance With Secondary Combustion elevating mechanism, reduces oxygen rifle at a distance from molten bath, make molten bath molten steel
Ingredient and temperature are uniform, reinforce stirring, reduce iron content in slag, reduce iron loss；When blowing, which reaches institute's steelmaking kind, to be required, rifle is mentioned
Blow off, the sampling of falling furnace are simultaneously tapped.
Analysis is sampled to result, after the single channel Oxygen Lance With Secondary Combustion IV of the design, in smelting process, oxygen blast
Time shorten to 11.2~12.3min, and desulfurization degree is increased to 9.5%~10.7%.Enter furnace steel scrap amount to be increased by original 16.35t
21.32t is added as, the increase of furnace steel scrap amount is entered:
Embodiment 4
Currently, averagely enter furnace steel scrap amount using conventional common oxygen rifle in 210 tons of converters of the steel mill and be generally 19.35t,
It is lower to enter furnace steel scrap amount.First slag charge being added is generally 2/3rds of total slag charge, and the slugging time is 4~6min, slugging
Time is long.In converter steelmaking process, average oxygen supply time is 15.4~16.7min, and desulfurization degree is 5.6%~6.7%.
As shown in figure 4, the secondary oxygen spout of single channel Oxygen Lance With Secondary Combustion IV is straight barrel type structure in the present embodiment, at 210 tons
By the application of single channel Oxygen Lance With Secondary Combustion IV, converter steelmaking process, 6 numbers of the oxygen rifle main oxygen jet orifice are 4 on site in converter,
7 numbers of assistant oxygen jet orifice are 8.6 subtended angle α of main oxygen jet orifice is 18 °, and 7 subtended angle β of assistant oxygen jet orifice is 45 °, throat diameter dLarynxFor 45mm,
6 outlet diameter d of main oxygen jet orifice1For 60mm, 7 inlet diameter d of assistant oxygen jet orifice2For 20mm.Main oxygen jet orifice 6 and assistant oxygen jet orifice 7 are in spray head
2 axial spacing L are 120mm.
Be embodied as follows: after the completion of upper furnace tapping, evacuation clinker blocks tapping hole, is added from overhead traveling crane into converter
Molten iron in ladle is blended into converter later by steel scrap, and molten iron temperature is generally greater than 1300 DEG C, then by oxygen lance lifting mechanism into
Row drop rifle oxygen supply, oxygen supply pressure are 0.90~1.25Mpa, and oxygen flow is 40000~45000Nm3/ h, send oxygen open blow it is same
When, first slag charge is added, additional amount is 3/4ths of the total quantity of slag of full furnace, is opened after blowing 3~4min, first slag chargeization is good,
Add second batch slag charge.It in blowing mid-term, supplies oxygen pressure and flow is held essentially constant, guarantee that " returning dry " does not occur for clinker,
Do not generate splash；It blows latter stage, using Oxygen Lance With Secondary Combustion elevating mechanism, reduces oxygen rifle at a distance from molten bath, make molten bath molten steel
Ingredient and temperature are uniform, reinforce stirring, reduce iron content in slag, reduce iron loss；When blowing, which reaches institute's steelmaking kind, to be required, rifle is mentioned
Blow off, the sampling of falling furnace are simultaneously tapped.
Analysis is sampled to result, after the single channel Oxygen Lance With Secondary Combustion IV of the design, in smelting process, oxygen blast
Time shorten to 13.2~14.5min, and desulfurization degree is increased to 9.4%~11.2%.Enter furnace steel scrap amount to be increased by original 19.35t
25.13t is added as, the increase of furnace steel scrap amount is entered:
By embodiment 1, embodiment 2, embodiment 3 and embodiment 4 it is found that the four kinds of single channels two designed using the present invention
Secondary burning oxygen rifle, in converter steelmaking process, slugging is fast, and oxygen supply time is reduced, and smelting cycle shortens；Smelting endpoint desulfurization degree mentions
It is high；Especially converter enters furnace steel scrap amount and is significantly increased, wherein the secondary combustion of single channel used in embodiment 3 and embodiment 4
It is best to burn oxygen rifle III, IV live using effect, enters furnace steel scrap amount and is promoted obviously.
Claims (8)
1. a kind of single channel Oxygen Lance With Secondary Combustion for improving converter scrap ratio, which is characterized in that including gun body and spray head, the rifle
Body includes the compound steel pipe structure being made of intermediate conduit, intermediate circumferential weld and peripheral conduits, and the intermediate conduit is passed through oxygen, institute
It states intermediate circumferential weld and is passed through cooling water, the peripheral conduits flow out return water, and the end face of the spray head is provided with main oxygen jet orifice, the spray
The side wall of head is provided with assistant oxygen jet orifice, and the pair oxygen spout flow accounts for the 15%~30% of total oxygen flow, the main oxygen spout
Flow accounts for the 70%~85% of total oxygen flow.
2. a kind of single channel Oxygen Lance With Secondary Combustion for improving converter scrap ratio according to claim 1, it is characterised in that: institute
Stating subtended angle between main oxygen jet orifice axis and gun body axis is α, and α is set as 9 °~18 °, the assistant oxygen jet orifice and gun body axis
Between subtended angle be β, and β is 2.1~2.5 times of α.
3. a kind of single channel Oxygen Lance With Secondary Combustion for improving converter scrap ratio according to claim 1, it is characterised in that: institute
It states main oxygen jet orifice and assistant oxygen jet orifice and is set as 40mm~150mm in spray head axial spacing L.
4. a kind of single channel Oxygen Lance With Secondary Combustion for improving converter scrap ratio according to claim 1, it is characterised in that: institute
It states main oxygen jet orifice and is set as 3~6, and the number of assistant oxygen jet orifice and main oxygen jet orifice ratio is 1.0~2.0 times.
5. a kind of single channel Oxygen Lance With Secondary Combustion for improving converter scrap ratio according to claim 1, it is characterised in that: institute
State the Laval structure that main oxygen jet orifice is set as conventional, the throat diameter d of the main oxygen jet orificeLarynxFor 25mm~45mm, main oxygen
Spray orifice outlet diameter d1For dLarynx1.1~1.5 times.
6. a kind of single channel Oxygen Lance With Secondary Combustion for improving converter scrap ratio according to claim 1, it is characterised in that: institute
Stating assistant oxygen jet orifice is straight barrel type or jumping expanding structure, straight barrel type structure assistant oxygen jet orifice inlet diameter d2For dLarynx0.3~0.5
Times；Jumping expanding structure assistant oxygen jet orifice expansion segment diameter d3For assistant oxygen jet orifice inlet diameter d21.1~1.5 times.
7. a kind of single channel Oxygen Lance With Secondary Combustion application method for improving converter scrap ratio, use according to claim 1
A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio, which is characterized in that include the following steps,
Step 1, after the completion of upper furnace tapping, evacuation clinker blocks tapping hole, and steel scrap is added into converter from overhead traveling crane, later will
Molten iron in ladle is blended into converter；
Step 2, it is controlled by single channel Oxygen Lance With Secondary Combustion of the Oxygen Lance With Secondary Combustion elevating mechanism to the design, and conjunction is provided
Suitable oxygen supply pressure and flow；While sending oxygen to open to blow, be added first slag charge, additional amount be the total quantity of slag of full furnace four/
Three；
Step 3, it opens after blowing 3~4min, first slag chargeization is good, adds second batch slag charge；In converting process, by oxygen flow
With oxygen supply pressure control in reasonable range, reinforces the stirring to converter molten pool, keep molten steel composition and temperature in molten bath uniform；
When blowing, which reaches institute's steelmaking kind, to be required, rifle blow off is mentioned, the sampling of falling furnace is simultaneously tapped.
8. a kind of single channel Oxygen Lance With Secondary Combustion application method for improving converter scrap ratio according to claim 7, special
Sign is: oxygen supply pressure described in step 2 is 0.75~1.25Mpa, oxygen supply pressure be conventional oxygen supply by lance pressure 1.05~
1.25 times, oxygen flow described in step 2 is 17000~45000Nm3/ h, oxygen flow are conventional oxygen supply by lance flow
1.10~1.35 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811184284.9A CN108977620B (en) | 2018-10-11 | 2018-10-11 | Single-channel secondary combustion oxygen lance for improving steel scrap ratio of converter and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811184284.9A CN108977620B (en) | 2018-10-11 | 2018-10-11 | Single-channel secondary combustion oxygen lance for improving steel scrap ratio of converter and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108977620A true CN108977620A (en) | 2018-12-11 |
| CN108977620B CN108977620B (en) | 2024-03-01 |
Family
ID=64543470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811184284.9A Active CN108977620B (en) | 2018-10-11 | 2018-10-11 | Single-channel secondary combustion oxygen lance for improving steel scrap ratio of converter and use method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108977620B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254250A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method for improving converter scrap steel ratio |
| CN114717380A (en) * | 2022-03-21 | 2022-07-08 | 北京科技大学 | Supersonic secondary combustion oxygen lance for improving converter steel scrap ratio |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3112627A1 (en) * | 1980-06-03 | 1982-04-15 | Voest-Alpine AG, 4010 Linz | Device on a steelworks converter for aftercombustion of carbon- monoxide-containing gases |
| CN201535631U (en) * | 2009-08-26 | 2010-07-28 | 鞍钢股份有限公司 | Double-flow oxygen lance nozzle |
| CN105441624A (en) * | 2016-01-12 | 2016-03-30 | 中冶赛迪上海工程技术有限公司 | Lance head structure and method for double-oxygen-flow adjustment of top blowing oxygen flow rate of converter |
| 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 |
| CN108300831A (en) * | 2018-02-27 | 2018-07-20 | 首钢京唐钢铁联合有限责任公司 | A method of improving dephosphorization converter smelting process origin of heat |
| CN208829713U (en) * | 2018-10-11 | 2019-05-07 | 东北大学 | A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio |
-
2018
- 2018-10-11 CN CN201811184284.9A patent/CN108977620B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3112627A1 (en) * | 1980-06-03 | 1982-04-15 | Voest-Alpine AG, 4010 Linz | Device on a steelworks converter for aftercombustion of carbon- monoxide-containing gases |
| CN201535631U (en) * | 2009-08-26 | 2010-07-28 | 鞍钢股份有限公司 | Double-flow oxygen lance nozzle |
| CN105441624A (en) * | 2016-01-12 | 2016-03-30 | 中冶赛迪上海工程技术有限公司 | Lance head structure and method for double-oxygen-flow adjustment of top blowing oxygen flow rate of converter |
| 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 |
| CN108300831A (en) * | 2018-02-27 | 2018-07-20 | 首钢京唐钢铁联合有限责任公司 | A method of improving dephosphorization converter smelting process origin of heat |
| CN208829713U (en) * | 2018-10-11 | 2019-05-07 | 东北大学 | A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254250A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method for improving converter scrap steel ratio |
| CN114717380A (en) * | 2022-03-21 | 2022-07-08 | 北京科技大学 | Supersonic secondary combustion oxygen lance for improving converter steel scrap ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108977620B (en) | 2024-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101117651B (en) | Converting process for converter low-silicon molten iron | |
| WO2019029136A1 (en) | Clean and rapid smelting method for all scrap steel electric arc furnace | |
| CN107419051B (en) | Promote the smelting process of converter scrap melting using gasification dephosphorized slag | |
| CN106282487B (en) | A kind of pre-dephosporizing method for molten iron | |
| CN108048618A (en) | A kind of converter CO2The method of vanadium extraction | |
| CN103060510A (en) | High scrap ratio smelting method by adopting gas to heat | |
| CN111254250A (en) | Smelting method for improving converter scrap steel ratio | |
| CN208829713U (en) | A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio | |
| CN108977620A (en) | A kind of single channel Oxygen Lance With Secondary Combustion and its application method improving converter scrap ratio | |
| CN102796841A (en) | Method for slagging steelmaking by side blowing of powder particle limestone in top-bottom combined blown converter | |
| CN103924027B (en) | Vanadium extraction method for making steel | |
| CN111763794B (en) | Method for smelting stainless steel by mixed blowing of chromium ore powder and carbon powder in TSR converter | |
| CN109609717A (en) | A kind of converter steel-smelting technique using porous oxygen lance | |
| CN102312044B (en) | Method for smelting with electric furnace | |
| CN114672607B (en) | Method for online reduction of iron oxide by converter deslagging | |
| CN115418428A (en) | Direct smelting reduction furnace | |
| CN113234886B (en) | Control method for realizing ultralow iron oxide of converter end-point slag | |
| CN201463594U (en) | Combined spray gun used for iron making by smelting reduction | |
| CN109628676B (en) | Short-process technology for directly producing pure molten iron | |
| CN210163472U (en) | Molten iron dephosphorization device | |
| CN203810892U (en) | Coal-oxygen blowing melting separation shaft furnace | |
| CN209602610U (en) | Copper making continuous-blowing furnace oxygen lance nozzle | |
| CN107779548B (en) | A kind of device and method of the side-blown injection refining of safe and efficient ladle | |
| CN114085949B (en) | Method for reducing smelting cost of total scrap steel of Consteel electric furnace by using anthracite | |
| CN218435821U (en) | Direct smelting reduction furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20181211 Assignee: Jiangsu Shidai Hongyuan Environmental Protection Technology Co.,Ltd. Assignor: Northeastern University Contract record no.: X2021210000016 Denomination of invention: A single channel secondary combustion oxygen lance for increasing scrap ratio of converter and its application method License type: Common License Record date: 20210407 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |