CN1139664C - Short flow-process electric arc furnace steel plant - Google Patents
Short flow-process electric arc furnace steel plant Download PDFInfo
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- CN1139664C CN1139664C CNB981173810A CN98117381A CN1139664C CN 1139664 C CN1139664 C CN 1139664C CN B981173810 A CNB981173810 A CN B981173810A CN 98117381 A CN98117381 A CN 98117381A CN 1139664 C CN1139664 C CN 1139664C
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- furnace
- electric arc
- arc furnace
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- steel
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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)
- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The present invention relates to a short-flow process steel plant with an electric arc furnace, which is provided with an iron making blast furnace, and the produced molten iron is filled in an electric furnace in a hot state to replace partial scrap steel. Lump ore, pellet ore, charred coal, coal and a smelting agent for the blast furnace are used as raw materials, and a strong-air warm blast furnace, an oxygen enriching and coal injecting device and a computer for monitoring the operation of the blast furnace are adopted without waste emission. The ratio of the volume of the blast furnace to the volume of an electric furnace is from 2.3 to 5.0 m<3>/t., and the optimal proportion of the hot filling molten iron replacing the scrap steel is from 30% to 50%. The present invention has no coking and sintering so as to eliminate the primary pollution source of the ordinary steel plant, reduce the amount of investment and occupation area and shorten a construction period. The present invention not only can effectively solve the problem of pure scrap steel shortage existing in a steel plant with the electric furnace, but also has high investment benefit.
Description
Technical field:
The present invention relates to a kind of steel mill, is exactly a kind of blast furnace that is provided with specifically, and the output molten iron substitutes the part steel scrap, and hot charging is gone into the novel short flow-process electric arc furnace of electric arc furnace.
Background technology:
Modern steel mill can be divided into two kinds basically.A kind of is long flow process steel mill (also claiming Steel Complex) by blast furnace-converter-continuous casting-rolling formation.It is the main force of Iron and Steel Production always.But because investment is big, problems such as construction period length and environmental protection are seldom built.Another kind is the short flow-process electric arc furnace steel plant by ultra-high power electric arc furnace-external refining-continuous casting-rolling formation.It is owing to the technical progress of electric arc furnace, and the exploitation such as compound heat supply, reinforcement oxygen blast, making foamed slag etc. and near net shape continuous casting technology has strengthened its vitality and competitive power significantly.Recent two decades comes, and worldwide short flow-process electric arc furnace steel plant development is very fast, and the annual production of electric arc furnace steel has now accounted for more than 30% of ultimate production of world's steel.
Yet the development of short flow-process electric arc furnace steel plant, the greatest problem that is run into is exactly the steel scrap shortage of resources, particularly contains the shortage problem of the low high-quality steel scrap of harmful element.The solution of this problem was mainly placed on direct-reduction process in the past and was produced sponge iron or briquette iron by hot molding.But the development of direct-reduction process is subject to local available resource, the energy and product price.
Other steel scrap substitute also has iron carbide and pig.The suitability for industrialized production of iron carbide is also not exclusively ripe technically.Electric arc furnace adds pig in a large number, except that considering the price factor, to consider also that owing to fusing and carbon rejection process smelting cycle prolongs, power consumption raises, productivity of furnace reduces and cause electric arc furnace-refining furnace-continuous casting to be difficult to coordination, to disconnect, and influences the direct motion of technical process.
In electric arc furnace was produced, hot metal charge substituted succeeding in developing of part steel scrap technology, gave new enlightenment in recent years.Molten iron substitutes the part steel scrap, can dilute the content of harmful element in the furnace mix, and helps removing the nitrogen content in the molten steel.Facts have proved the decarburization effect of molten iron, be better than sponge iron and briquette iron by hot molding.Molten iron has a large amount of physics sensible heat and potential chemical heat.These heats enter electric arc furnace, have advantages such as saves energy, reduction consumption of electrode, shortening smelting cycle.As substituting 30% steel scrap with molten iron, the electric arc furnace electric power consumption per ton steel can reduce more than the 100Wh/t, and electric arc furnace productivity improves 20%.To some national electric-arc furnace steelmaking production, molten iron is best steel scrap substitute.
Short flow-process electric arc furnace steel plant, hot metal supply can have several selections.The one, the cupola furnace is set, secondary iron will increase the production cost of steel like this, and it is irrational obviously relying on secondary iron.Another kind is by smelting reduction process, adopts COREX to go to provide molten iron for electric arc furnace.Subject matter is that the COREX device is invested much bigger in some countries than blast furnace system.Counter investment is big, becomes the difficulty of this technology of application.Also having a kind of is to build traditional huge, complicated ironmaking system that comprises blast furnace, sintering, coking, raw material in short flow-process electric arc furnace steel plant.Because investment is big, floor space is big, the construction period is long, also have environmental issue etc., weak point flow process electric furnace steel mill is difficult to consider to adopt.Therefore the supply that solves molten iron has economically become the limiting element of short flow process electric furnace steel mill development under certain condition.
Summary of the invention:
The object of the present invention is to provide a kind of novel short flow-process electric arc furnace steel plant, to overcome the above-mentioned shortcoming of prior art.
Technical solution of the present invention comprises 1 or 2 bell-less blast furnace main body system and 1 or 2 superpower or ultra-high power electric arc furnace that is provided with the eccentric bottom tapping of converting metal trough, hot metal ladle tipple that is provided with high wind-heat wind furnace, coal powder injection or oxygen-enriched coal spray equipment; Blast furnace in the described blast-furnace body system and described Arc Furnace Capacity are than being 2.3-5.0m3/t.Also be provided with refining furnace, continuous caster and reduction unit.
Blast-furnace body of the present invention system comprises: blast-furnace body, storing and charging equipment, casting house, hotblast stove, gas cleaning system, blast furnace water-cooling system, pulverized coal preparation and winding-up, oxygen-enriched injection system and instrument automation system.
Blast furnace of the present invention, raw material adopts iron ore bulk, pellet, coke, coal and flux etc.
Blast furnace of the present invention adopts no bell furnace roof, to adapt to the requirement that blast furnace raw material is iron ore lump ore, pellet and big coal injection amount.
Blast furnace system of the present invention adopts the high-blast-temperature hot-blast stove technology, coal powder injection or oxygen-enriched coal spray technology, Hydraulic clay gun, electronic taphole drilling machine, computer monitoring control charging of blast furnace, hotblast stove and blast furnace operating.
Blast furnace of the present invention is adopted the dedusting of beam method, hydraulic discharged slag, and the water coolant closed cycle, casting house, the dedusting of feed and feeding system reduces noise, technology such as no waste discharge.
Furnace volume of the present invention is 2.3～5.0m with the ratio of capacity of electric arc furnace
3/ t, the ratio that molten iron substitutes steel scrap is 20-60%, optimum proportion is 30-50%.Capacity of electric arc furnace is the 30-200 ton, and the high furnace capacity that matches is 100-1000m
3Along with the increase of capacity of electric arc furnace and molten iron substitute the increasing of steel scrap ratio, the upper limit of the above-mentioned blast furnace of corresponding selection and electric arc furnace volume and volume ratio is opposite then select the lower limit of its ratio.The configuration of blast furnace can be selected an electric arc furnace blast furnace of configuration or two blast furnaces, or blast furnace of two electric arc furnace configurations.
Electric arc furnace of the present invention is ultra-high power electric arc furnace or high power electric arc furnace.
Electric arc furnace of the present invention is established and is converted metal trough and hot metal ladle tipple, is blended into molten iron in electric arc furnace.
Electric arc furnace of the present invention adopts eccentric bottom tapping, stays steel operation, oxygen blast to flux, strengthen technology such as decarburization, spray coke grain making foamed slag.Decarbonization rate＞0.12%min, oxygen supply intensity 20-55Nm
3/ t.
Short flow-process electric arc furnace steel plant of the present invention is made up of blast-furnace body system-electric arc furnace-refining furnace-continuous casting-milling train.Only establish the key character that the blast-furnace body system is a short flow-process electric arc furnace steel plant of the present invention.Raw material iron ore lump ore described in the present invention, pellet, all outsourcings of coke, thus in short flow-process electric arc furnace steel plant, can establish coking system, pelletizing and sintering system, simplified traditional huge and ironmaking system complexity greatly.Blast furnace system described in the present invention, have occupation of land less, the distance of electric arc furnace and blast furnace is near, environmental protection condition is improved, less investment, recovery of the capital are fast, be easy to produce and advantages such as management, is suitable for short flow-process electric arc furnace steel plant.Its keeps and has developed that the investment of short flow process steel mill is little, labour productivity is high, less energy consumption, the advantage that production cost is low, thereby be a kind of novel short flow-process electric arc furnace steel plant.In certain scope, short flow-process electric arc furnace steel plant of the present invention is better than length flow process Steel Complex, ironmaking system complexity, the device that is the latter is many, investment is big, floor space is big, transportation is complicated, difficult and short flow-process electric arc furnace steel plant mates, input-output ratio is excessive simultaneously, economic benefit must be a problem, and this also is that short flow-process electric arc furnace steel plant is difficult to bear.
Certainly, if the existing blast furnace of Steel Complex is had ready conditions and supplied molten iron by blast furnace to existing or newly-built electric arc furnace, then should be regarded as a different matter, but that has not belonged to the defined short flow-process electric arc furnace steel plant of the present invention.
Short flow-process electric arc furnace steel plant of the present invention, system supplies molten iron to electric arc furnace by blast-furnace body, to substitute the part steel scrap, compare with traditional short flow-process electric arc furnace steel plant, its superiority is to become electric arc furnace cold charge steel scrap and the solid surrogate is the part hot metal charge, to the production of electric arc furnace steel, have the effects such as cost of energy-conservation, as to lower consumption, improve steel output and quality, reduction steel.Adopt hot metal charge to substitute the steel scrap of 30-60% as electric arc furnace, electric power consumption per ton steel reduces 100-200kWh/t, foreshortens in 50 minutes from time of tapping-tapping.Short flow-process electric arc furnace of the present invention is owing to be provided with the blast-furnace body system, thereby become electric arc furnace and be the part hot charging by cold charge, be to electric arc furnace production line traditional concept breakthrough, list can be alleviated the contradiction of the few steel scrap shortage of impure element, and will promote the development of short flow-process electric arc furnace steel plant.
Embodiment:
Embodiment of the present invention: one of the existing 90 tons of ultra-high power electric arc furnace of short flow-process electric arc furnace steel plant, produce ten thousand tons of steel 60-80 per year.Substitute the 30-60% steel scrap by hot metal charge, it is 380m that useful volume is set
3One in blast furnace.Furnace volume is 4.2m with the ratio of electric arc furnace volume
3/ t.Blast furnace is produced ten thousand tons of molten iron of 30-33.7 per year, and day taps a blast furnace 18 times, and on average the amount of tapping a blast furnace is the 47-52 ton, daily output molten iron 846-936 ton.90 tons of electric arc furnace days tap 18-24 time.Every stove is on average tapped 90 tons, daily output steel 1600-2100 ton.
Hot metal composition is: C:4.73%, Si 0.4%, S 0.034%, P 0.08%, Fe 94.35%, molten iron temperature 1450 degree.
90 tons of capacity of electric arc furnace substitute 30% steel scrap by hot metal charge, economize on electricity 100kWh/t, and consumption of electrode reduces by 0.75～1.0Kg/t, and electric arc furnace productivity improves 20%.
Claims (2)
1. short flow-process electric arc furnace steel plant, it comprises 1 or 2 blast-furnace body system and 1 or 2 superpower or ultra-high power electric arc furnace that is provided with the eccentric bottom tapping of converting metal trough, hot metal ladle tipple of only being provided with the bell-less blast furnace of high-blast-temperature hot-blast stove, coal powder injection or oxygen-enriched coal spray equipment; Blast furnace in the described blast-furnace body system and described Arc Furnace Capacity are than being 2.3-5.0m3/t.
2. the short flow-process electric arc furnace steel plant of claim 1, it also is provided with refining furnace, continuous caster and reduction unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981173810A CN1139664C (en) | 1998-08-25 | 1998-08-25 | Short flow-process electric arc furnace steel plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981173810A CN1139664C (en) | 1998-08-25 | 1998-08-25 | Short flow-process electric arc furnace steel plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1245833A CN1245833A (en) | 2000-03-01 |
| CN1139664C true CN1139664C (en) | 2004-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981173810A Expired - Fee Related CN1139664C (en) | 1998-08-25 | 1998-08-25 | Short flow-process electric arc furnace steel plant |
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| Country | Link |
|---|---|
| CN (1) | CN1139664C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667588B (en) * | 2013-09-05 | 2015-08-26 | 通裕重工股份有限公司 | Electricity converter steelmaking process |
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1998
- 1998-08-25 CN CNB981173810A patent/CN1139664C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1245833A (en) | 2000-03-01 |
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