CN106702072A - Converter combined blowing method with bottom tuyeres being visible in full furnace campaign - Google Patents
Converter combined blowing method with bottom tuyeres being visible in full furnace campaign Download PDFInfo
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- CN106702072A CN106702072A CN201510789309.8A CN201510789309A CN106702072A CN 106702072 A CN106702072 A CN 106702072A CN 201510789309 A CN201510789309 A CN 201510789309A CN 106702072 A CN106702072 A CN 106702072A
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- slag
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- blowing element
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Abstract
The invention provides a converter combined blowing method with bottom tuyeres being visible in a full furnace campaign. The method includes the steps that bottom tuyere bricks are changed into blind bricks, and the thickness of furnace bottom lining bricks and the bottom tuyere bricks is increased by 200-600mm; in the first 45-55 furnaces when a converter of newly-constructed furnace lining bricks runs, plain carbon steel is selected as a smelted steel type; 2-4 bottom tuyeres in two trunnion directions are installed at first; a less-slag fast-splashing and less-slag fast-supplementing mode is adopted for conducting furnace lining maintenance; the thickness of a furnace lining is at least measured once with a thickness gauge every eight hours, and two or more visible bottom blowing element tuyeres are guaranteed; the visible bottom blowing condition and furnace lining erosion condition files of each furnace are established; and by the adoption of economic campaign life, the maximum combined blowing campaign life can be safely kept. By means of the method, efficient combined blowing with the converter bottom tuyeres being visible in the full furnace campaign is realized, steel can be effectively cleaned, furnace lining erosion is slowed down, desorption of harmful elements like phosphorus and sulfur and reduction of a manganese element are facilitated, and consumption of flux and alloy is reduced.
Description
Technical field
The invention belongs to process for making technical field, and in particular to a kind of Blowing Converter of the holding bottom rifle whole course visible within the stove labour phase
Method.
Background technology
Converter top-bottom blowing metallurgical technology popularization and application in the industry since 1980, because it combines top blast, bottom blowing both sides
Strong point, transform in addition existing converter easily, only several years begin to the whole world popularize.Such as Japan of some countries,
Simple top-blown method is eliminated.Since converter lining protection technology by slag splashing popularization and application, the converter lining life of China is increased substantially.Simultaneously
Promote the development of the multiple blowing technology of China.Iron and Steel Research Geueral Inst and domestic large iron and steel enterprise cooperation, exploitation " longevity is blown turn again
Stove smelting technique (LCB) ", has reached the world lead level for blowing field of steel-making again.Wuhan Iron and Steel Plant two makes steel 90 tons of combined blown converters should
After with " long-lived combined blown converter smelting technique (LCB) ", the world's combined blown converter highest furnace life for creating 15208 stoves for 1999 records
Record, and increase year by year, more create within 2003 29942 stove new records.In above-mentioned stove labour, blow again than having reached 100%, terminal
Molten Steel Cleanliness has obtained raising by a relatively large margin, and combined blown converter endpoint molten steel [C] [O] product value is 0.0028, reaches international first
Enter level.
Although top-bottom blowing metallurgical technology is developed rapidly, bottom lance life how is improved, carried out in the world nearly 20 years
Research work, but fails to obtain important breakthrough always.In order to solve converter longevity furnace life and the relatively low lance of bottom lance life
Shield, in the world using following technical measures：(1) sacrifice and blow again, protect furnace life：Because bottom lance life fails synchronous raising,
Cause to blow again than significantly declining (≤20%), be forced to abolish combined blowing process.(2) sacrifice furnace life, guarantor blows again：Combined blowing process can be protected
Card steel quality, therefore abandon splashing slag technique.(3) quick-replaceable bottom-blowing air feed element technology is used：Japan is using less-slag melting
Efficient converter producing technology, average furnace life reaches 5000 stoves, a bottom-blowing air feed element is changed therebetween, it is ensured that blow ratio >=90% again.
The 255 tons of converters of U.S. big lake steel mill use Technology of Slag Splashingfor Furnace Maintenance, furnace life is reached more than 10000 stoves.To ensure to blow effect again,
Technology for quick-replaceable bottom-blowing air feed element is carried out using every 2000 stove.
Above-mentioned control method of blowing again is all (bottom rifle to be covered with slag, so that bottom rifle is not using recessive invisible bottom rifle during stove is used as a servant
It can be seen that), control the full stove labour for blowing effect again to blow method again by dynamic control furnace bottom thickness, because bottom rifle is invisible, blow again
The control that effect can not be stablized, and blow effect again and blow effect far from answer visual with bottom rifle and compare.
The content of the invention
The present invention provides a kind of full stove labour bottom rifle visual Blowing Converter method, the purpose is to keep the air port of bottom blowing element in converter
The whole stove labour phase is visual all the time, bottom blown gas directly, is efficiently stirred and turns molten steel in the stove, on the one hand effectively reduces converter
The oxidisability of molten steel terminal oxygen value and slag, clean steel simultaneously slows down the erosion of furnace lining；On the other hand dynamic conditions is improved,
Promote harmful element phosphorus, the removing of sulphur and the reduction of manganese element, so as to reduce the consumption of flux and alloy.
Therefore, the technical solution that the present invention is taken is：
A kind of full stove uses as a servant the visual Blowing Converter method of bottom rifle, and its specific method is：
(1) the bottom rifle brick that will build converter bottom by laying bricks or stones is all changed to the solid blind brick in no bottom rifle hole；
(2) thickness of furnace bottom lining brick and bottom rifle brick is increased into by 200~600mm；
(3) 45~55 stoves before the new new blow-on of converter for building backup lining brick by laying bricks or stones, smelt steel grade selection straight carbon steel, and avoid Molten Steel over-oxidation；
(4) after the stove of converter smelting 50~100, the online hot swap of bottom rifle is carried out；Using the quick hot swap bottom blowing element of lossless furnace bottom
Method, at first install two 2~4, bottom rifles in gudgeon direction；The method of the lossless quick hot swap bottom blowing element of furnace bottom, that is, bore
Before the rifle of bottom, it is ensured that original thickness of slag layer, not carrying out furnace bottom operation；Drill bit is got near Slag Layer, interrupts drilling, with burning oxygen
Mode processes remaining Slag Layer, with drilling machine that the treatment of slag blanket hole is round and smooth after grilling thoroughly, it is ensured that drilling has with bottom blowing element external diameter
The plus tolerance of 1mm, then installs bottom blowing element, and first-class pad brick is tamped with the husky space by bottom rifle and the surrounding that drills of Martin, sealed
It is good；Stove uses as a servant the prometaphase, and the bottom blowing element for using is criticized right overhead has the air port thickness of resistance to material less than 500mm or less than furnace bottom average thickness
During 150~200mm, or the stove labour latter stage bottom blowing element air port thickness of resistance to material is when being less than 500mm, closes the bottom blowing element, changes
Sit for an examination in place of another person the bottom rifle closed in generation in bottom near tapping side slag line；Stove uses as a servant mid-term, changes non-gudgeon with the furnace bottom thicker part of slag lining
Bottom blowing element substitutes the bottom blowing element for needing to close the furnace bottom area that rises；Stove uses as a servant the later stage, changes the furnace bottom orientation higher that calibrator is measured
Bottom blowing element substitute and need to close the bottom blowing element of furnace bottom area of rising；
(5) few slag is taken to splash soon, the mode of mending carries out furnace lining maintenance to few slag soon；Few slag splashes after i.e. tapping terminates according to slag situation soon,
1/2~1/3 slag is outwelled, slag is then splashed, slag effect is splashed in raising；Few slag is mended furnace bottom is carried out using slag fettling bottom mode soon
Safeguard, before slag is mended, 1/2 slag is stayed in converter, is firmly splashed in furnace bottom and segment dystectic slag by slag mode of splashing stage by stage
Position, reduces the erosion of furnace bottom；
(6) every eight hours with calibrator at least to kiln lining thickness measuring once, it is ensured that no less than 2 visible bottom blowing element air ports, dynamic
Adjustment catch carbon rifle position, furnace bottom declines, and catch carbon standard rifle position improves 50~100mm；Furnace bottom rising, catch carbon standard rifle position reduction by 50~
100mm, maintains the dynamic equilibrium of converter bottom thickness；
(7) the maximum furnace life blown again can be safely kept using economic campaign life, bottom of the thickness of resistance to material less than 500mm at air port
Number of elements is blown more than 1/3, it is seen that when bottom blowing element air port is less than 2, carry out plan blowing out.
Beneficial effects of the present invention are：
By using blind brick, it is therefore prevented that bottom brick is offset, and condition is created to be smoothed out bottom rifle hot swap；Strengthened by early stage
Lining brick sintering operation technology, it is to avoid stove uses as a servant the rapid erosion of initial stage lining brick, the dynamic equilibrium loss of furnace lining；By lossless stove
The technology of the quick hot swap bottom blowing element in bottom, single bottom blowing element service life is enhanced about more than once；Splashed soon by few slag, lack slag
Fast benefit mode carries out furnace lining maintenance, the dynamic equilibrium loss of furnace bottom, it is achieved thereby that visual efficiently multiple of the full stove labour bottom rifle of converter
Blow, effectively reduce the oxidisability of converter molten steel terminal oxygen value and slag, clean steel simultaneously slows down the erosion of furnace lining；It is simultaneously strong
Promote harmful element phosphorus, the removing of sulphur and the reduction of manganese element, reduce the consumption of flux and alloy, this is metallurgical boundary in full stove
Labour is blown pioneering in terms of research again.
Specific embodiment
With 260 tons of top and bottom combined blown converters, at the diameter of bottom 0.6 as a example by evenly distributed 10 bottom blowing elements：
1st, bottom rifle brick is all changed to solid blind brick；And furnace bottom thickness is increased into 450mm, so that furnace bottom gross thickness is by 1100mm
Increase to 1550mm.
2nd, new stove uses as a servant preceding 50 stove, smelts steel grade selection straight carbon steel, forbids Molten Steel over-oxidation, strengthens furnace lining and safeguards and splash slag operation,
50 stoves terminate, furnace bottom rising 100mm, and remainder furnace lining does not have erosion, and sintering is good.
3rd, converter runs 50 stoves, using the method for the quick hot swap bottom blowing element of lossless furnace bottom, symmetrical four opened near gudgeon
Bottom blowing element.
4th, splash slag mode to be splashed soon using few slag, tap after terminating according to slag situation, outwell 1/2~1/3 slag, then splash slag,
Slag effect is splashed in raising.If production interval is more long, take few slag to mend soon, furnace bottom is safeguarded using slag fettling bottom mode,
Before slag is mended, 1/2 slag is stayed in converter, is firmly splashed at furnace bottom and segment position dystectic slag by slag mode of splashing stage by stage.
5th, every eight hours with calibrator to kiln lining thickness measuring once, with reference to supervision manually to furnace lining, and ensure not less than 2 it is visible
Bottom blowing element air port, dynamic adjustment catch carbon rifle position, the teams and groups for visible bottom blowing element air port on duty less than 2 enter to operative employee
Row performance appraisal.
6th, the 1500th stove, outputs steel side slag line two bottom blowing elements nearby, closes and corrodes more serious bottom blowing element two.3500th
Stove, opens positive tapping side and positive iron making side bottom blowing element, simultaneously closes off two bottom blowing elements of correspondence of bottom blowing effect on driving birds is not good；4000 stoves,
4500 stoves, 5000 stoves, 5500 stoves, 6000 stoves and 6500 stoves are respectively with the bottom blowing that bottom blowing element tuyere bottom thickness is relatively thick
Element substitutes the bottom blowing element for needing to close the furnace bottom area that rises, and stove labour reaches 7000 stoves, and furnace lining is torn in blowing out open.
Claims (1)
1. a kind of full stove uses as a servant the visual Blowing Converter method of bottom rifle, it is characterised in that：
(1) the bottom rifle brick that will build converter bottom by laying bricks or stones is all changed to the solid blind brick in no bottom rifle hole；
(2) thickness of furnace bottom lining brick and bottom rifle brick is increased into by 200~600mm；
(3) 45~55 stoves before the new new blow-on of converter for building backup lining brick by laying bricks or stones, smelt steel grade selection straight carbon steel, and avoid Molten Steel over-oxidation；
(4) after the stove of converter smelting 50~100, the online hot swap of bottom rifle is carried out；Two bottom rifles 2~4 in gudgeon direction are first installed
Branch；The method of the lossless quick hot swap bottom blowing element of furnace bottom, that is, before boring bottom rifle, it is ensured that original thickness of slag layer, not carrying out furnace bottom
Operation；Drill bit is got near Slag Layer, interrupts drilling, and remaining Slag Layer is processed with oxygen mode is burnt, will with drilling machine after grilling thoroughly
The treatment of slag blanket hole is round and smooth, it is ensured that drilling has the plus tolerance of 1mm with bottom blowing element external diameter, then installs bottom blowing element, first-class pad
Brick, is tamped with the husky space by bottom rifle and the surrounding that drills of Martin, sealed；Stove uses as a servant the prometaphase, and the bottom blowing element for using is criticized right overhead to be had
When the air port thickness of resistance to material is less than 500mm or less than furnace bottom 150~200mm of average thickness, or stove labour latter stage bottom blowing element air port is resistance to
When material thickness is less than 500mm, the bottom blowing element is closed, change the bottom rifle that the bottom near tapping side slag line sits for an examination in place of another person generation to close；Stove is used as a servant
Mid-term, changes non-gudgeon and the bottom blowing element for needing to close the furnace bottom area that rises is substituted with the bottom blowing element of the furnace bottom thicker part of slag lining；
Stove uses as a servant the later stage, and the bottom blowing element for changing the furnace bottom orientation higher that calibrator is measured substitutes the bottom blowing element for needing to close the furnace bottom area that rises；
(5) few slag is taken to splash soon, the mode of mending carries out furnace lining maintenance to few slag soon；Few slag splashes after i.e. tapping terminates according to slag situation soon,
1/2~1/3 slag is outwelled, slag is then splashed, slag effect is splashed in raising；Few slag is mended furnace bottom is carried out using slag fettling bottom mode soon
Safeguard, before slag is mended, 1/2 slag is stayed in converter, is firmly splashed in furnace bottom and segment dystectic slag by slag mode of splashing stage by stage
Position；
(6) every eight hours with calibrator at least to kiln lining thickness measuring once, it is ensured that no less than 2 visible bottom blowing element air ports, adjustment
Catch carbon rifle position, furnace bottom declines, and catch carbon standard rifle position improves 50~100mm；Furnace bottom rising, 50~100mm of catch carbon standard rifle position reduction；
(7) thickness of resistance to material is less than the bottom blowing element quantity of 500mm more than 1/3 at air port, it is seen that bottom blowing element air port is less than 2
When individual, plan blowing out is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510789309.8A CN106702072B (en) | 2015-11-17 | 2015-11-17 | A kind of Blowing Converter method that full stove labour bottom rifle is visual |
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| CN201510789309.8A CN106702072B (en) | 2015-11-17 | 2015-11-17 | A kind of Blowing Converter method that full stove labour bottom rifle is visual |
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| CN106702072A true CN106702072A (en) | 2017-05-24 |
| CN106702072B CN106702072B (en) | 2018-08-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578033A (en) * | 2019-09-24 | 2019-12-17 | 张家港宏昌钢板有限公司 | Converter bottom blowing replacement method |
| CN111363877A (en) * | 2018-12-25 | 2020-07-03 | 新疆八一钢铁股份有限公司 | Method for prolonging service life of furnace lining of steel-making converter |
| CN113249541A (en) * | 2021-04-23 | 2021-08-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Furnace protection method of bottom blowing powder injection converter |
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| CN101338350A (en) * | 2008-08-07 | 2009-01-07 | 武汉钢铁(集团)公司 | Element protection process by bottom-blowing gas supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363877A (en) * | 2018-12-25 | 2020-07-03 | 新疆八一钢铁股份有限公司 | Method for prolonging service life of furnace lining of steel-making converter |
| CN110578033A (en) * | 2019-09-24 | 2019-12-17 | 张家港宏昌钢板有限公司 | Converter bottom blowing replacement method |
| CN110578033B (en) * | 2019-09-24 | 2021-11-23 | 张家港宏昌钢板有限公司 | Converter bottom blowing replacement method |
| CN113249541A (en) * | 2021-04-23 | 2021-08-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Furnace protection method of bottom blowing powder injection converter |
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| Publication number | Publication date |
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| CN106702072B (en) | 2018-08-31 |
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