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 PDF

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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
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oxygen
lance
jet orifice
secondary combustion
converter
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CN108977620B (en
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郑淑国
刘志远
安艳飞
吴优
王爽
朱苗勇
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Northeastern University China
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Northeastern University China
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    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

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

A kind of single channel Oxygen Lance With Secondary Combustion and its application method improving converter scrap ratio
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)

1.一种提高转炉废钢比的单流道二次燃烧氧枪，其特征在于，包括枪体和喷头，所述枪体包括由中间管道、中间环缝和外围管道组成的三层钢管结构，所述中间管道通入氧气，所述中间环缝通入冷却水，所述外围管道流出回水，所述喷头的端面设置有主氧喷孔，所述喷头的侧壁设置有副氧喷孔，所述副氧喷口流量占总供氧流量的15％～30％，所述主氧喷口流量占总供氧流量的70％～85％。1. A kind of single flow path secondary combustion oxygen lance that improves converter steel scrap ratio, is characterized in that, comprises lance body and shower head, and described lance body comprises the three-layer steel pipe structure that is made up of middle pipeline, middle annular seam and peripheral pipeline, Oxygen is passed into the middle pipe, cooling water is passed into the middle annular seam, return water flows out from the peripheral pipe, the end face of the nozzle is provided with a main oxygen nozzle, and the side wall of the nozzle is provided with a secondary oxygen nozzle , the flow rate of the auxiliary oxygen spout accounts for 15% to 30% of the total oxygen supply flow, and the flow rate of the main oxygen spout accounts for 70% to 85% of the total oxygen supply flow. 2.根据权利要求1所述的一种提高转炉废钢比的单流道二次燃烧氧枪，其特征在于：所述主氧喷孔轴线与枪体轴线之间的张角为α，且α设置为9°～18°，所述副氧喷孔与枪体轴线之间的张角为β，且β为α的2.1～2.5倍。2. A single-channel secondary combustion oxygen lance for increasing the scrap steel ratio of the converter according to claim 1, characterized in that: the opening angle between the axis of the main oxygen injection hole and the axis of the lance body is α, and α Set at 9°-18°, the opening angle between the auxiliary oxygen injection hole and the axis of the gun body is β, and β is 2.1-2.5 times of α. 3.根据权利要求1所述的一种提高转炉废钢比的单流道二次燃烧氧枪，其特征在于：所述主氧喷孔与副氧喷孔在喷头轴向间距L设置为40mm～150mm。3. A single-channel secondary combustion oxygen lance for increasing the scrap steel ratio of the converter according to claim 1, characterized in that: the axial distance L between the main oxygen injection hole and the auxiliary oxygen injection hole is set at 40 mm to 40 mm. 150mm. 4.根据权利要求1所述的一种提高转炉废钢比的单流道二次燃烧氧枪，其特征在于：所述主氧喷孔设置为3～6个，且副氧喷孔与主氧喷孔的个数比为1.0～2.0倍。4. A single-channel secondary combustion oxygen lance for increasing the scrap steel ratio of the converter according to claim 1, characterized in that: the number of the main oxygen injection holes is set to 3 to 6, and the auxiliary oxygen injection holes are connected with the main oxygen injection holes. The number ratio of the injection holes is 1.0 to 2.0 times. 5.根据权利要求1所述的一种提高转炉废钢比的单流道二次燃烧氧枪，其特征在于：所述主氧喷孔设置为常规的拉瓦尔型结构，所述主氧喷孔的喉口直径d喉为25mm～45mm，主氧喷孔出口直径d1为d喉的1.1～1.5倍。5. A single-channel secondary combustion oxygen lance for increasing the scrap steel ratio of the converter according to claim 1, characterized in that: the main oxygen injection hole is set as a conventional Laval-type structure, and the main oxygen injection hole The diameter dthroat of the throat is 25mm to 45mm, and the diameter d1 of the outlet of the main oxygen nozzle is 1.1 to 1.5 times that of dthroat . 6.根据权利要求1所述的一种提高转炉废钢比的单流道二次燃烧氧枪，其特征在于：所述副氧喷孔为直筒型或突跃扩张型结构，直筒型结构副氧喷孔入口直径d2为d喉的0.3～0.5倍；突跃扩张型结构副氧喷孔扩张段直径d3为副氧喷孔入口直径d2的1.1～1.5倍。6. A single-channel secondary combustion oxygen lance for increasing the scrap steel ratio of the converter according to claim 1, characterized in that: the auxiliary oxygen injection hole is a straight cylinder or sudden expansion structure, and the straight cylinder structure of the auxiliary oxygen The nozzle hole inlet diameter d 2 is 0.3-0.5 times of the d -throat ; the diameter d 3 of the expansion section of the sub-oxygen nozzle hole in the sudden expansion structure is 1.1-1.5 times the diameter of the sub-oxygen nozzle inlet d 2 . 7.一种提高转炉废钢比的单流道二次燃烧氧枪使用方法，根据权利要求1所述的采用一种提高转炉废钢比的单流道二次燃烧氧枪，其特征在于，包括以下步骤，7. A method for using a single-channel secondary combustion oxygen lance for improving the ratio of converter steel scrap, according to claim 1, adopting a single-channel secondary combustion oxygen lance for improving the ratio of converter steel scrap, characterized in that, comprising the following step, 步骤1，上一炉出钢完成后，倒净炉渣，堵住出钢口，由天车向转炉内添加废钢，之后将铁水包内的铁水兑入转炉；Step 1. After the tapping of the previous furnace is completed, the slag is poured out, the tapping hole is blocked, steel scrap is added to the converter by the crane, and then the molten iron in the ladle is mixed into the converter; 步骤2，由二次燃烧氧枪升降机构对本设计的单流道二次燃烧氧枪进行控制，并提供合适的供氧压力和流量；在送氧开吹的同时，加入第一批渣料，加入量为全炉总渣量的四分之三；Step 2: Control the designed single channel secondary combustion oxygen lance by the lifting mechanism of the secondary combustion oxygen lance, and provide suitable oxygen supply pressure and flow rate; at the same time of oxygen supply and blowing, add the first batch of slag, The amount added is three quarters of the total slag in the furnace; 步骤3，开吹3～4min后，第一批渣料化好，再加入第二批渣料；吹炼过程中，将供氧流量和供氧压力控制在合理的范围内，加强对转炉熔池的搅拌，使熔池内钢水成分和温度均匀；当吹炼到达所炼钢种要求时，提枪停吹，倒炉取样并进行出钢。Step 3: After 3-4 minutes of blowing, the first batch of slag is melted, and then the second batch of slag is added; during the blowing process, the flow rate and pressure of oxygen supply are controlled within a reasonable range to strengthen the control of the converter melting process. The stirring of the molten pool makes the composition and temperature of the molten steel in the molten pool uniform; when the blowing reaches the requirements of the steel type, the gun is lifted to stop blowing, and the furnace is reversed to take samples and tap the steel. 8.根据权利要求7所述的一种提高转炉废钢比的单流道二次燃烧氧枪使用方法，其特征在于：步骤2所述的供氧压力为0.75～1.25Mpa，供氧压力为常规氧枪供氧压力的1.05～1.25倍，步骤2所述的供氧流量为17000～45000Nm3/h，供氧流量为常规氧枪供氧流量的1.10～1.35倍。8. A method for using a single-channel secondary combustion oxygen lance for increasing the ratio of converter scrap to steel according to claim 7, characterized in that: the oxygen supply pressure in step 2 is 0.75-1.25Mpa, and the oxygen supply pressure is conventional The oxygen supply pressure of the oxygen lance is 1.05-1.25 times, the oxygen supply flow rate in step 2 is 17000-45000Nm 3 /h, and the oxygen supply flow rate is 1.10-1.35 times the oxygen supply flow rate of a conventional oxygen lance.
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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
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