CN1072212A - A kind of method of accelerated melting steel scrap by steel-smelting electric-arc furnace - Google Patents
A kind of method of accelerated melting steel scrap by steel-smelting electric-arc furnace Download PDFInfo
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- CN1072212A CN1072212A CN91110577A CN91110577A CN1072212A CN 1072212 A CN1072212 A CN 1072212A CN 91110577 A CN91110577 A CN 91110577A CN 91110577 A CN91110577 A CN 91110577A CN 1072212 A CN1072212 A CN 1072212A
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- coal
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- steel scrap
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- 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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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a kind of electric furnace arrangement for producing steel coal oxygen blast fluxing method, coal is added in the steel scrap, and be contained in below the oxygen rifle of cold-zone as far as possible, coal can directly be packed in the stove, also can dress up pouch earlier, or coal and packing of steel scrap.The coal of coal is unrestricted, but the granularity of coal will be more than 5mm, and charged send oxygen blast at once behind the electricity.This method technology is simple, easy to operate, and effect is remarkable, promotes easily.
Description
The present invention relates to a kind of method of electric furnace arrangement for producing steel melting period quickening scrap melting speed.
In EAF Steelmaking Process in order to quicken scrap melting, reach the purpose of boosting productivity and reducing power consumption, extensively adopt oxygen lance to flux, some countries adopt high heat value gas (for example Sweet natural gas, coke-oven gas, liquefied petroleum gas (LPG) etc.) or liquid fuel (for example heavy oil, diesel oil etc.) oxygen lance, owing to be subjected to this technology of resource limit to be difficult to promote in China.The coaloust-oxygen gun of University of Science ﹠ Technology, Beijing and Tangshan Iron and Steel Co's cooperative development is more perfect through in a few years application and improvement, and at ton steel coal dust 11kg, the oxygen coal compares 2.5m
3During/kg with do not blow the coal facies ratio 25min that shortens the heat, melting electric consumption reduces 80kwh/t.But this technical requirements coal powder size is the 0.0737mm(200 order), the powder manufacturing apparatus complexity, also require coal dust dry as far as possible, coal needs drying to handle, pressurized air needs through processed, because security reason can not use the high coal of fugitive constituent, the coaloust-oxygen gun igniting is slow, the total system maintenance load is big, and line clogging and the excessive accident of pipe wear coal dust often take place.More domestic factories are in order to reduce pig iron consumption, with solid carbon-containing material carburetting such as coke, hard coal, class graphite, carbonaceous material is added in furnace bottom, adorn steel scrap above, switch on and begin oxygen blast after 20～40 minutes, along with the molten steel recarburization that makes of fusing, the main purpose of this processing method is carburetting, requires the carbon content height of carbonaceous material, fugitive constituent is low, sulphur content is required tight, can not oxygen blast at once after energising, do not solve the melting period cold-zone yet and melt problem synchronously.
The purpose of this invention is to provide a kind of coal oxygen blowing method, to accelerate scrap melting, its method is simple, and can adapt to different coals.
For achieving the above object, the present invention has changed the fuel and the Oxygen Flow thigh of traditional oxygen lance and has carried in the same way and the mixed firing mode, also changed the mode that in the carbonaceous material carburetion method carbonaceous material is added in furnace bottom, but will load in mixture into stove greater than coal and the steel scrap of 5mm, charged send oxygen blast immediately behind the electricity.The charging method of coal has three kinds: first kind of method coal of coalingging is contained in the middle and upper part of steel scrap; Second method is contained in the bottom of steel scrap with a small amount of coal, and most of coal is contained in the middle and upper part of steel scrap; The third method is the factory that the baling of scrap device is arranged, and steel scrap can be packed with coal, and coal is beaten the centre at bag.In first and second kinds of methods of coalingging, coal can be dressed up pouch in advance, pack into then in the stove, the shape that also can directly loose is packed in the stove, bag or adorn and in bulkly all coal is not contained in place near electrode in case increase consumption of electrode, be adorned some coals in the cold-zone of electric furnace more, increase the heat in this district so that and the steel scrap at other positions melt synchronously.The electric furnace charged send oxygen blast at once behind the electricity, the oxygen amount is ascending, normal oxygen pressure is controlled at 0.5～0.7Mpa, oxygen and the coal combustion that loads in mixture in steel scrap, the steel scrap temperature rises rapidly, particularly the steel scrap of cold-zone is heated to the red heat state very soon, treats that steel scrap stops oxygen blast after all burning the red molten bath of collapsing in the stove.The add-on of coal is 10～30kg/t steel, can adopt various coals, the higher coal point of ignition of fugitive constituent is low, and thermal value is higher, and flame is longer, help the steel scrap heating, use the coal of fugitive constituent 20～30% comparatively suitable, both caught fire easily, the utilization ratio of coal is also high, sulphur in coal major part when burning enters furnace gas, thereby requires not tight to sulphur content in the coal.The oxygen rifle preferably adopts the porous water cooled oxygen lance, and oxygen rifle quantity can be decided according to the heat size size, and 5 tons of electric furnaces can be adorned 2～3, and the large-tonnage electric furnace can be adorned several more.The oxygen rifle can be contained in furnace roof, also can be contained on the furnace wall.The end of furnace roof oxygen rifle is concordant with roof brick, and furnace wall oxygen rifle is positioned on 300～500mm place, the residual top of slag, 5～30 ° of angles, and oxygen rifle end is concordant with furnace lining.Be that furnace roof oxygen rifle or furnace wall oxygen rifle all will be aimed at the cold-zone.The present invention is equally applicable to the direct current electric furnace arrangement for producing steel, also can replace coal with other carbonaceous materials.
Advantage of the present invention is: (1) method is simple, invests lowly, and general factory all can implement, with the coaloust-oxygen gun technology mutually specific investment reduce 80～90%.(2) use coal wide, be particularly suitable for the higher coal of fugitive constituent, the source of coal is wide.(3) not strict to the sulphur content requirement, sulphur content is little to the quality influence of steel in the coal.(4) when the add-on of coal is 10～30kg/t steel, flux with oxygen blast and to compare (not coal) economize on electricity 8～16%, shorten the heat 6～15%.(5) coal catches fire easily.
Embodiments of the invention are as follows:
Embodiment 1:
Nominal capacity is the electric furnace of 5t, transformer capacity 2250KVA, Intake Quantity 12t.Add the coal 180kg of the above fugitive constituent 20% of granularity 5mm, the every 20kg of coal is dressed up one bag, adorn 9 bags altogether.Use the shape steel scrap that looses, divide three chargings, each 3 bags of coals of 4t steel scrap (60kg altogether), 34 hole water cooled oxygen lances are installed on the furnace wall at 300mm place, slag line top, and 20 ° of angles are aimed at three cold-zones in the stove.Charging for the first time is dress 4t steel scrap earlier, then 3 bags of coals is contained in the oxygen rifle below of three cold-zones in the stove respectively.The oxygen blast of switching on behind the charged, the oxygen amount is not too big during the beginning oxygen blast, adds large oxygen quantity gradually after point catches fire, and the oxygen pressure-controlled stops oxygen blast at 0.5Mpa behind the scrap melting, carry out second time and feed.Charging for the second time is with loading method and the operation of charging back are with for the first time identical for the third time, and the steel scrap of packing into for the third time in the time of the 93rd minute all melts.Flux with the oxygen blast of coal not and to compare, fusing time shortens 22min, power consumption decline 62kwh/t.
Embodiment 2:
Nominal capacity 5t electric furnace, transformer capacity 2250KVA, Intake Quantity 12t adopts heavy-duty waste steel once to feed, and uses the coal 180kg of the above fugitive constituent 20% of 5mm, and by 34 hole water cooled oxygen lance oxygen blast that are placed in furnace roof, the end of oxygen rifle is concordant with roof brick.Loading sequence is 30kg coal → 4t heavy-duty waste steel → 50kg coal → 4t heavy-duty waste steel → 50kg coal → 4t heavy-duty waste steel → 50kg coal, all will be contained in the oxygen rifle below of three cold-zones when coalingging equably at every turn.Charged send the oxygen blast of electricity back, and the oxygen amount is not too big during the beginning oxygen blast, adds large oxygen quantity gradually after point catches fire, and normal oxygen pressure 0.5Mpa stops oxygen behind the scrap melting, fluxes with the oxygen blast of coal not and compares fusing time and shorten 19 minutes, economize on electricity 52kwh/t.
Embodiment 3:
5t electric furnace and furnace roof oxygen rifle and identical with embodiment 2 with coal, Intake Quantity 12t adopts frivolous material packing process.With the frivolous steel scrap of 75kg pack into the packing trough in, refill the 2.25kg coal, adorn the frivolous steel scrap of 75kg at last, start packing machine, be pressed into 400 * 300 * 300mm steel scrap piece, coal wraps in the middle of the steel scrap, frivolous steel scrap of 12t and 180kg coal break into 80.Divide three chargings, for the first time pack 27 into, 27 for the second time, 26 for the third time, the oxygen blast of switching on behind each charged is feeded behind the scrap melting next time, the oxygen amount is ascending during oxygen blast, steel scrap stops oxygen after melting fully, fluxes with the oxygen blast of coal not and compares fusing time and shorten 20 minutes, economize on electricity 54kwh/t.
Claims (5)
1, a kind ofly make the electric furnace arrangement for producing steel steel scrap quicken the method for fusing by the coal oxygen blast, it is characterized in that: when filling with substance loads in mixture coal in steel scrap, and charged send oxygen blast at once behind the electricity.
2, acceleration scrap melting method according to claim 1, it is characterized in that: the when filling with substance coal is contained in the middle and upper part of steel scrap.
3, acceleration scrap melting method according to claim 1, it is characterized in that: the when filling with substance a small amount of coal is contained in the steel scrap bottom, and most of coal is contained in the steel scrap middle and upper part.
4, acceleration scrap melting method according to claim 1 is characterized in that: during baling of scrap, coal is wrapped in the steel scrap, in the stove of packing into then.
5, acceleration scrap melting method according to claim 1, it is characterized in that: the granularity of coal is more than 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91110577A CN1024683C (en) | 1991-11-05 | 1991-11-05 | Method of accelerated melting steel scrap by steel-smelting electric-arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91110577A CN1024683C (en) | 1991-11-05 | 1991-11-05 | Method of accelerated melting steel scrap by steel-smelting electric-arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1072212A true CN1072212A (en) | 1993-05-19 |
| CN1024683C CN1024683C (en) | 1994-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91110577A Expired - Fee Related CN1024683C (en) | 1991-11-05 | 1991-11-05 | Method of accelerated melting steel scrap by steel-smelting electric-arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1024683C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593905A (en) * | 2018-12-04 | 2019-04-09 | 天津钢铁集团有限公司 | Steel scrap baking method in a kind of Converter |
| CN110699513A (en) * | 2019-10-23 | 2020-01-17 | 首钢集团有限公司 | Electric furnace steelmaking method and system |
| CN110846467A (en) * | 2019-10-23 | 2020-02-28 | 首钢集团有限公司 | Method and device for supplementing heat to electric furnace |
| CN111154938A (en) * | 2020-01-21 | 2020-05-15 | 鞍钢股份有限公司 | Smelting method for applying light and thin scrap steel in converter |
| CN111172347A (en) * | 2020-01-21 | 2020-05-19 | 鞍钢股份有限公司 | Carbon-containing solid waste and light and thin scrap steel mixed processing furnace entering process |
| CN113215354A (en) * | 2021-05-18 | 2021-08-06 | 张家港宏昌钢板有限公司 | Electric furnace full scrap steel smelting process |
| CN114085949A (en) * | 2021-11-29 | 2022-02-25 | 山西晋煤集团技术研究院有限责任公司 | Method for reducing total scrap steel smelting cost of Consteel electric furnace by using anthracite |
-
1991
- 1991-11-05 CN CN91110577A patent/CN1024683C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593905A (en) * | 2018-12-04 | 2019-04-09 | 天津钢铁集团有限公司 | Steel scrap baking method in a kind of Converter |
| CN110699513A (en) * | 2019-10-23 | 2020-01-17 | 首钢集团有限公司 | Electric furnace steelmaking method and system |
| CN110846467A (en) * | 2019-10-23 | 2020-02-28 | 首钢集团有限公司 | Method and device for supplementing heat to electric furnace |
| CN110846467B (en) * | 2019-10-23 | 2021-08-17 | 首钢集团有限公司 | Method and device for supplementing heat to electric furnace |
| CN111154938A (en) * | 2020-01-21 | 2020-05-15 | 鞍钢股份有限公司 | Smelting method for applying light and thin scrap steel in converter |
| CN111172347A (en) * | 2020-01-21 | 2020-05-19 | 鞍钢股份有限公司 | Carbon-containing solid waste and light and thin scrap steel mixed processing furnace entering process |
| CN111172347B (en) * | 2020-01-21 | 2021-04-27 | 鞍钢股份有限公司 | Carbon-containing solid waste and light and thin scrap steel mixed processing furnace entering process |
| CN113215354A (en) * | 2021-05-18 | 2021-08-06 | 张家港宏昌钢板有限公司 | Electric furnace full scrap steel smelting process |
| CN114085949A (en) * | 2021-11-29 | 2022-02-25 | 山西晋煤集团技术研究院有限责任公司 | Method for reducing total scrap steel smelting cost of Consteel electric furnace by using anthracite |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1024683C (en) | 1994-05-25 |
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