CN208829713U - A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio - Google Patents
A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio Download PDFInfo
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- CN208829713U CN208829713U CN201821649061.0U CN201821649061U CN208829713U CN 208829713 U CN208829713 U CN 208829713U CN 201821649061 U CN201821649061 U CN 201821649061U CN 208829713 U CN208829713 U CN 208829713U
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Abstract
A kind of single channel Oxygen Lance With Secondary Combustion 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 15%~30% of the total oxygen flow of the assistant oxygen jet orifice flow Zhan, the 70%~85% of the total oxygen flow of the main oxygen jet orifice flow Zhan, this single channel Oxygen Lance With Secondary Combustion, 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, in the case where guaranteeing that assistant oxygen jet orifice jet stream does not neither cause erosion to converter lining again with the generation of main oxygen jet orifice jet stream " volume is inhaled " phenomenon , 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 utility model belongs to converter steeling technology field more particularly to a kind of single channel for improving converter scrap ratio is secondary
Burning oxygen rifle.
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.
Utility model content
In view of the deficiencies of the prior art, the utility model designs a kind of Novel single-stream road Oxygen Lance With Secondary Combustion, in traditional oxygen
Only spray head is transformed on the basis of rifle, i.e., opens up reasonable assistant oxygen jet orifice on the basis of original spray head, and be based on the single channel
Oxygen Lance With Secondary Combustion optimizes converter steelmaking process, and then effectively improves the post-combustion rate of convertor steelmaking process coal gas,
It is added to furnace steel scrap amount, improves converter scrap ratio, reduces oxygen blow duration, shortens the converter smelting period, improves converter terminal desulfurization
Rate.
To achieve the goals above, the utility model adopts the following technical solution:
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 15%~30% of the total oxygen flow of the assistant oxygen jet orifice flow Zhan, the main oxygen spray
The 70%~85% of the total oxygen flow of hole flow Zhan.
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.
The beneficial effects of the utility model,
(1) the utility model single channel Oxygen Lance With Secondary Combustion, the main oxygen jet orifice of oxygen rifle and conventional traditional oxygen rifle design are consistent,
On the basis of original spray head, reasonable assistant oxygen jet orifice structure is offered, is neither penetrated with main oxygen jet orifice in guarantee assistant oxygen jet orifice jet stream
In the case that stream occurs " volume is inhaled " phenomenon and does not cause erosion to converter lining, the oxygen jet and furnace that are projected using assistant oxygen jet orifice
Interior CO burning generates a large amount of heat to heat molten steel, can be added to furnace steel scrap amount, improves converter scrap ratio；This is secondary
Burning oxygen rifle also helps converter steelmaking process slugging, increases oxygen supply intensity, reduces oxygen supply time, shortens the converter smelting period,
And improve converter terminal desulfurization degree.
(2) the utility model single channel Oxygen Lance With Secondary Combustion is not required to be transformed original gun body, only to oxygen lance nozzle into
Row transformation, and secondary orifices outlet number is identical as entrance number, pipeline modification is passed through to cooling water smaller, body of a gun good cooling results,
Difficulty of processing 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 supplies oxygen 1.05~1.25 times that pressure is conventional oxygen rifle pressure, and oxygen flow is the 1.10~1.35 of conventional oxygen rifle flow
Times；Therefore the Oxygen Lance With Secondary Combustion can greatly improve the post-combustion rate of carbon monoxide in converter and influence the main oxygen of oxygen rifle
The decarburization in hole 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 utility model 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, the 7 total oxygen flow of flow Zhan of assistant oxygen jet orifice 15%~
30%, the 70%~85% of the 6 total oxygen flow of flow Zhan of main oxygen jet orifice.
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 on certain steel mill 80t, 120t, 180t, 210t top and bottom combined blown converter respectively to the utility model I, II, III,
The metallurgical effect of IV oxygen 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 streams designed using the utility model
Road Oxygen Lance With Secondary Combustion, in converter steelmaking process, slugging is fast, and oxygen supply time is reduced, and smelting cycle shortens；Smelting endpoint desulfurization
Rate improves；Especially converter enters furnace steel scrap amount and is significantly increased, wherein single channel two used in embodiment 3 and embodiment 4
Secondary burning oxygen rifle III, IV live using effect are best, enter furnace steel scrap amount and are promoted obviously.
Claims (6)
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 15%~30% of the pair total oxygen flow of oxygen spout flow Zhan, the main oxygen spout
The 70%~85% of the total oxygen flow of flow Zhan.
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.
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| CN201821649061.0U CN208829713U (en) | 2018-10-11 | 2018-10-11 | A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977620A (en) * | 2018-10-11 | 2018-12-11 | 东北大学 | A kind of single channel Oxygen Lance With Secondary Combustion and its application method improving converter scrap ratio |
| CN115627317A (en) * | 2022-10-20 | 2023-01-20 | 山东钢铁集团日照有限公司 | Oxygen lance nozzle and method for shortening smelting period of converter |
-
2018
- 2018-10-11 CN CN201821649061.0U patent/CN208829713U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977620A (en) * | 2018-10-11 | 2018-12-11 | 东北大学 | A kind of single channel Oxygen Lance With Secondary Combustion and its application method improving converter scrap ratio |
| CN108977620B (en) * | 2018-10-11 | 2024-03-01 | 东北大学 | Single-channel secondary combustion oxygen lance for improving steel scrap ratio of converter and use method thereof |
| CN115627317A (en) * | 2022-10-20 | 2023-01-20 | 山东钢铁集团日照有限公司 | Oxygen lance nozzle and method for shortening smelting period of converter |
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