CN110241287A - A kind of method of the ultra high electric arc furnace without electric smelting - Google Patents
A kind of method of the ultra high electric arc furnace without electric smelting Download PDFInfo
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- CN110241287A CN110241287A CN201910524897.0A CN201910524897A CN110241287A CN 110241287 A CN110241287 A CN 110241287A CN 201910524897 A CN201910524897 A CN 201910524897A CN 110241287 A CN110241287 A CN 110241287A
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- furnace
- electric arc
- charging
- oxygen
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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
- C21C5/52—Manufacture of steel in electric furnaces
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- 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
Abstract
A kind of method the invention discloses ultra high electric arc furnace without electric smelting includes the following steps: to reserve residual soup in furnace, low discharge oxygen blast, feed operation, and main breaking-in period flows slag operation, the burn-off phase, soup operation and thermometric sample operation out, then proceed by next furnace operation.It rations the power supply when occurring it is an advantage of the invention that solving Consteel electric arc furnaces in short time generation electric power obstacle or power failure, continues the problem that steady production does not stop production, guarantee the normal operation of the full process of entire factory, greatly reduce the loss of steel mill.
Description
Technical field
The invention belongs to ultra high electric arc furnace technical field of smelting more particularly to a kind of ultra high electric arc furnace without electrometallurgy
The method of refining.
Background technique
Electric arc furnaces (electric arc furnace) is the high melt ore and metal generated using electrode arc
Electric furnace, energy is concentrated very much when gas discharge forms electric arc, and arc area temperature utilizes the fuel factor heating furnace of electric arc at 3000 DEG C or more
Material carries out the method for making steel of melting.Alternating current is inputted in furnace by 3 graphite electrodes, is generated between end and metal charge under the electrodes
Electric arc directly heats furnace charge using the high temperature of electric arc, steelmaking process is enable to carry out.Electrical arc furnace is matched by heat size per ton
The number of transformer capacity is divided into common power electric arc furnace, high power electric arc furnace and ultra high electric arc furnace.Uhp electric arc furnace
It is that last century the mid-1960s rise, the arc characteristic of high voltage, long arc was mainly changed to high current, low electricity at that time
Pressure, the arc characteristic of short electric arc, to make electric furnace smelting be possible to not only input higher power but also keep refractory material expense
2.5h or less is shortened to by 4h in acceptable limit, and by every furnace steel smelting time.Hereafter, technique develops very
Fastly, not only the unit power level of electric furnace is higher and higher, but also with the raising of power level, every matching technology is also opened in succession
It sends out and becomes better and approaching perfection day by day, uhp electric arc furnace is made to obtain popularity application in the world.Consteel electric arc furnaces is twentieth century
TECHINT company, the eighties Italy is developed, and the patented product as the said firm is known as Consteel Furnace (Kang Si
Enlightening electric arc furnaces).Nucor-Darlington in the U.S. in 1987 is produced as a trial, and the nineties comes into vogue, after succeeding
It is promoted the use of in the U.S., Italy, Japan and China etc..Chinese First Consteel electric arc furnaces is 2000 in Xining special steel
It is completed and goes into operation.Consteel electric arc furnaces working principle: while continuous charging, the high-temp waste gas generated using stove is to entrance
Furnace charge carry out continuously pre-heating, the temperature that steel scrap can be made to enter stokehold is up to 600 DEG C (200~600 DEG C), and the exhaust gas warp after preheating
It crosses combustion chamber and enters residual neat recovering system.Process realizes that steel scrap is continuously added to, continuously pre-heating and continuous melting, electric arc heated melt
Pond, molten bath melting waste steel.
Kang Sidi electric arc furnace smelting process characteristic:
First is that scrap steel preheating: steel scrap enters stokehold, is preheated by the flue gas generated in furnace in conveying road preheating section, mean temperature
It is 600~650 DEG C；
Second is that steel is stayed to operate: at least 30 tons of molten steel in electric furnace, then continuous feed, electrode power transmission, carbon -- oxygen rifle operation,
Electric furnace works under flat molten bath state always, can reduce electric arc fluctuation；
Third is that continuous feed: without frequent blowing out and opening bell, reduce thermal loss；
Fourth is that operating technology is easy: steel being stayed to stay slag, foam slag burialing arc list molten bath smelting operation technology.
Although Consteel electric arc furnaces has the advantages that more, ultra high electric arc furnace is all impact load, is belonged to
In power consumption rich and influential family, and transformer capacity is high, is easy to happen electrical equipment malfunction.It rations the power supply or the equipment faults such as transformer in government
When, energization production can not be carried out, production is caused to stop.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention provides a kind of method of the ultra high electric arc furnace without electric smelting, solves
Ultra high electric arc furnace power equipment breaks down or ration the power supply power failure when, arc furnace equipment still can normally give birth to
The technical problem of production, Consteel electric arc furnaces can continue to steady production and do not stop production when the short time electric power obstacle occurring.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of method of the ultra high electric arc furnace without electric smelting, its main feature is that including the following steps:
1) residual soup is reserved, previous furnace goes out soup and finishes, and residual soup is reserved in furnace, and it carries out in arc furnace and equipment point-detecting confirms,
Confirm that equipment is without exception, resistance to material state is normal in furnace, is ready for the smelting of next furnace；
2) low discharge oxygen blast calculates the amount of being blown into of theoretical oxygen according to raw material charge weight and composition；Oxygen lance prepares just
Thread smelts initial stage, and using 2 grades of low discharge oxygen blast operations of gear, oxygen rifle carries out low discharge oxygen blast in slag blanket face；
3) steel slag residual in furnace is heated up and stirs fusing by low discharge oxygen blast, after steel slag has good fluidity, by the trolley that feeds
Feed location is advanced to, charging operation is ready for；
4) charging operation, charging trolley advance to feed location, and starting charging trolley carries out charging operation, and tail vibration starts,
Charging rate sets the frequency converter modulation frequency percentage of tail vibration motor based on 80%, and 80% refers to the frequency converter of tail vibration motor
Modulation frequency percentage, normal frequency 50HZ are 100%, are 740 revs/min for motor speed, and 80% corresponding is exactly
40HZ, revolving speed also accordingly decline；80% is during normal production, and dissolution of raw material speed and charging rate, which can reach, compares balance
One parameter value carries out appropriate adjustment according to the composition of raw material and BF's inner state: when melting sources speed is higher than charging rate, adding
Material speed remains unchanged；Melting sources speed is lower than charging rate, when having the generation of a small amount of windrow, reduces charging rate or temporary
Stop charging；Raw materials start, and oxygen flow is gradually increased to 4 grades of (3000Nm3), into main breaking-in period；
5) main breaking-in period, raw material addition finish, and charging trolley is retracted in time, avoid subsequent oxygen blast that steel slag is caused to splash viscous
Cold steel is added 1 bag of quick lime from tail vibration feed bin and advances to charging trolley head；
6) slag operation is flowed, main breaking-in period has judged composition, the dissolution of raw material state in furnace, the rear entrance such as amount of being blown into of oxygen
Slag operation is flowed, basicity in furnace is reduced, removes impurity, so far flowing slag terminates, into the burn-off phase；
7) the burn-off phase carries out composition fine tuning and temperature adjustment；Lime input amount and oxygen are determined according to steel slag state in furnace
The amount of being blown into, furnace inner sampling operation can be carried out when during which connecting if there is oxygen rifle, wait the chemical examination of composition, after composition is qualified, furnace
Interior molten steel temperature is normally carried out out soup operation, if not reaching soup requirement out can continue to be blown into certain amount of oxygen and auxiliary work
Industry；
8) go out soup operation and thermometric sampling operation, then proceed by next furnace operation.
Further, the electric arc furnaces type is the Consteel electric arc furnaces with continuous charging system, described
Consteel electric arc furnaces has continuous charging system, and Consteel electric arc furnaces can be accomplished to reduce heat in the case where opening bell
Amount loss, raw material preheats in advance reduces energy consumption.
Further, it is 20~30Ton that residual soup is reserved in the furnace.
Further, the raw material uses easily fusing and the higher raw material of Si content.
Further, the raw material is unsatisfactory for easily melting and when the higher material condition of Si content, and high hopper prepares Fe-Si
To supplement Si deficiency.
Further, the step 5) main breaking-in period, will control the basicity in furnace when main initial stage breaking-in period, if slag stream in furnace
When dynamic property is bad, a certain amount of Fe-Si of input can be set, the temperature in furnace is effectively improved, to adjust steel slag mobility；Conversely,
It sets a certain amount of CaO if basicity in furnace is relatively low and is gradually added, observe basicity in furnace.
Compared with prior art, the present invention by adopting the above technical scheme, compared with conventional electrifying method and tradition steel-making, has
Have the advantage that it is to solve Consteel electric arc furnaces to ration the power supply when occurring in short time generation electric power obstacle or power failure, continues to stablize
The problem not stopped production is produced, arc furnace equipment can be produced normally 12 hours or more；Do not have it is blast-melted, whole solid feeds into
Row is produced without electricity；It is mainly reacted by oxygen blast and provides heat come melt raw material, guarantee the normal operation of the full process of entire factory, greatly
The loss of steel mill is reduced greatly.
Specific embodiment
Following present invention will be described in further detail in conjunction with specific embodiments, understand that technical staff clearly
Advantages of the present invention.It should be understood that content therein is used merely as illustrating, and protection scope of the present invention is constituted limit absolutely not
System.
Ultra high electric arc furnace generally requires energization and could normally produce, but arc furnace equipment belongs to high pressure, high load capacity
Electrical equipment, electric power associate device are easy to happen failure, cause not can be carried out the normal production of energization.Or national and district government
Electric load limitation is carried out in response to energy-saving and emission-reduction requirement, execution is rationed the power supply or power down, causes electric arc furnaces cannot positive normal open
Electricity production.Enterprise's competence exertion maximum economic benefit in equipment operation, once production stop, production cost will rapidly on
It rises.
Jiangsu steel mill creates 60 tons of Consteel electric arc furnaces, due to failures such as transformer and high-voltage electricity after building up,
It repeatedly carries out having developed without electric operation and enabling a device to maintain operation under conditions of a set of unregulated power is supplied.
A kind of method of the ultra high electric arc furnace without electric smelting, its main feature is that including the following steps:
1) residual soup is reserved, previous furnace goes out soup and finishes, and reserves residual soup 20-30Ton in furnace, carries out in arc furnace and equipment point
Inspection confirmation, confirmation equipment is without exception, and resistance to material state is normal in furnace, is ready for the smelting of next furnace；The present embodiment be using
Electric arc furnaces type is the Consteel electric arc furnaces with continuous charging system, and Consteel electric arc furnaces has continuous charging system,
Consteel electric arc furnaces can accomplish to reduce thermal loss in the case where opening bell, and raw material preheats in advance reduces energy consumption；
2) low discharge oxygen blast calculates the amount of being blown into of theoretical oxygen according to raw material charge weight and composition, and raw material uses easily fusing
And the higher raw material of Si content, if raw material is unsatisfactory for easily melting and when the higher material condition of Si content, high hopper prepares Fe-Si
To supplement Si deficiency；Oxygen lance is ready, and using 2 grades of low discharge oxygen blast operations of gear, oxygen rifle carries out low stream in slag blanket face
Measure oxygen blast；At smelting initial stage, molten steel amount is on the low side in arc furnace, and the C in furnace, Si content is lower, using low discharge oxygen blast, both protects
Refractory furnace bottom in turn avoids big flow oxygen blast and molten steel in furnace is caused to boil；
3) steel slag residual in furnace is heated up and stirs fusing by low discharge oxygen blast, after steel slag has good fluidity, by the trolley that feeds
Feed location is advanced to, charging operation is ready for；
4) charging operation, charging trolley advance to feed location, and starting charging trolley carries out charging operation, and tail vibration starts,
Charging rate sets the frequency converter modulation frequency percentage of tail vibration motor based on 80%, and 80% refers to the frequency converter of tail vibration motor
Modulation frequency percentage, normal frequency 50HZ are 100%, are 740 revs/min for motor speed, and 80% corresponding is exactly
40HZ, revolving speed also accordingly decline；80% is during normal production, and dissolution of raw material speed and charging rate, which can reach, compares balance
One parameter value carries out appropriate adjustment according to the composition of raw material and BF's inner state: when melting sources speed is higher than charging rate, adding
Material speed remains unchanged；Melting sources speed is lower than charging rate, when having the generation of a small amount of windrow, reduces charging rate or temporary
Stop charging；Raw materials start, and oxygen flow is gradually increased to 4 grades of (3000Nm3), into main breaking-in period；(note Nm3Refer to
The gas volume of 0 degree Celsius of 1 normal atmosphere pressure；N represents standard conditions (Normal Condition), the i.e. condition of air
For a standard atmospheric pressure, temperature is 0 DEG C, relative humidity 0%)
5) main breaking-in period, raw material addition finish, and charging trolley is retracted in time, avoid subsequent oxygen blast that steel slag is caused to splash viscous
Cold steel is added 1 bag of quick lime from tail vibration feed bin and advances to charging trolley head；The alkali in furnace is controlled when main initial stage breaking-in period
Degree can set a certain amount of Fe-Si (500Kg) of input, effectively improve the temperature in furnace, come if slag mobility is bad in furnace
Adjust steel slag mobility；Conversely, setting a certain amount of CaO if basicity in furnace is relatively low (1000Kg being gradually added, and observes alkali in furnace
Degree)；
6) slag operation is flowed, main breaking-in period has judged composition, the dissolution of raw material state in furnace, the rear entrance such as amount of being blown into of oxygen
Slag operation is flowed, basicity in furnace is reduced, removes impurity, so far flowing slag terminates, into the burn-off phase；
7) the burn-off phase carries out composition fine tuning and temperature adjustment；Lime input amount and oxygen are determined according to steel slag state in furnace
The amount of being blown into, furnace inner sampling operation can be carried out when during which connecting if there is oxygen rifle, wait the chemical examination of composition, after composition is qualified, furnace
Interior molten steel temperature is normally carried out out soup operation, if not reaching soup requirement out can continue to be blown into certain amount of oxygen and auxiliary work
Industry；
8) go out soup operation and thermometric sampling operation, then proceed by next furnace operation.
Claims (6)
1. a kind of method of ultra high electric arc furnace without electric smelting, it is characterised in that include the following steps:
1) residual soup is reserved, previous furnace goes out soup and finishes, and residual soup is reserved in furnace, carries out in arc furnace and equipment point-detecting confirms, confirmation
Equipment is without exception, and resistance to material state is normal in furnace, is ready for the smelting of next furnace；
2) low discharge oxygen blast calculates the amount of being blown into of theoretical oxygen according to raw material charge weight and composition；Oxygen lance is ready,
At smelting initial stage, using 2 grades of low discharge oxygen blast operations of gear, oxygen rifle carries out low discharge oxygen blast in slag blanket face；
3) steel slag residual in furnace is heated up and stirs fusing by low discharge oxygen blast, and after steel slag has good fluidity, charging trolley is advanced
To feed location, it is ready for charging operation；
4) feed operation, and charging trolley advances to feed location, and starting charging trolley carries out charging operation, tail vibration starting, charging
Speed sets the frequency converter modulation frequency percentage of tail vibration motor based on 80%, is carried out according to the composition of raw material and BF's inner state
Appropriate adjustment: when melting sources speed is higher than charging rate, charging rate is remained unchanged；Melting sources speed is lower than charging speed
Degree when having the generation of a small amount of windrow, reduces charging rate or temporarily ceases charging；Raw materials start, and oxygen flow gradually increases
Add to 4 grades of (3000Nm3), into main breaking-in period；
5) main breaking-in period, raw material addition finish, and charging trolley is retracted in time, avoid subsequent oxygen blast that steel slag splashing is caused to glue cold
Steel is added 1 bag of quick lime from tail vibration feed bin and advances to charging trolley head；
6) slag operation is flowed, main breaking-in period has judged composition, the dissolution of raw material state in furnace, the laggard slag that becomes a mandarin such as amount of being blown into of oxygen
Operation reduces basicity in furnace, removes impurity, and so far flowing slag terminates, into the burn-off phase；
7) the burn-off phase carries out composition fine tuning and temperature adjustment；Blowing for lime input amount and oxygen is determined according to steel slag state in furnace
Enter amount, furnace inner sampling operation can be carried out when during which connecting if there is oxygen rifle, after waiting the chemical examination of composition, composition qualified, steel in furnace
Liquid temperature is normally carried out out soup operation, if not reaching soup requirement out can continue to be blown into certain amount of oxygen and less important work；
8) go out soup operation and thermometric sampling operation, then proceed by next furnace operation.
2. method of a kind of ultra high electric arc furnace without electric smelting according to claim 1, it is characterised in that: the electric arc furnaces
Type is the Consteel electric arc furnaces with continuous charging system, and the Consteel electric arc furnaces has continuous charging system,
Consteel electric arc furnaces can accomplish to reduce thermal loss in the case where opening bell, and raw material preheats in advance reduces energy consumption.
3. method of a kind of ultra high electric arc furnace without electric smelting according to claim 1, it is characterised in that: pre- in the furnace
Staying residual soup is 20~30Ton.
4. a kind of ultra high electric arc furnace is without electrometallurgy smelting method according to claim 1, it is characterised in that: the raw material uses
Easily fusing and the higher raw material of Si content.
5. a kind of ultra high electric arc furnace is without electrometallurgy smelting method according to claim 4, it is characterised in that: the raw material is discontented
When foot easily fusing and the higher material condition of Si content, high hopper prepares Fe-Si to supplement Si deficiency.
6. a kind of ultra high electric arc furnace is without electrometallurgy smelting method according to claim 1, it is characterised in that: the step 5) is main
Breaking-in period, will control the basicity in furnace when main initial stage breaking-in period, if slag mobility is bad in furnace, it is a certain amount of can to set input
Fe-Si effectively improves the temperature in furnace, to adjust steel slag mobility；Conversely, if basicity in furnace it is relatively low set it is a certain amount of
CaO is gradually added, and observes basicity in furnace.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101926A (en) * | 1987-03-20 | 1988-10-12 | 北京钢铁学院 | A kind of reinforcement electric furnace smelting process |
| JP2002097512A (en) * | 2000-09-22 | 2002-04-02 | Daido Steel Co Ltd | Production method for molten steel |
| CN1598000A (en) * | 2004-07-27 | 2005-03-23 | 南京钢铁联合有限公司 | Production technology for melting steel by electric arc furnace converter |
| CN1775959A (en) * | 2005-11-24 | 2006-05-24 | 广东韶钢松山股份有限公司 | Electric furnace to converter steel making production process |
| CN101580912A (en) * | 2009-06-19 | 2009-11-18 | 武汉钢铁(集团)公司 | Low carbon high sulfur free-cutting steel production process |
| CN103205529A (en) * | 2013-03-29 | 2013-07-17 | 江苏省沙钢钢铁研究院有限公司 | Zero-power consumption steel-making method using electric-arc furnace |
-
2019
- 2019-06-18 CN CN201910524897.0A patent/CN110241287A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101926A (en) * | 1987-03-20 | 1988-10-12 | 北京钢铁学院 | A kind of reinforcement electric furnace smelting process |
| JP2002097512A (en) * | 2000-09-22 | 2002-04-02 | Daido Steel Co Ltd | Production method for molten steel |
| CN1598000A (en) * | 2004-07-27 | 2005-03-23 | 南京钢铁联合有限公司 | Production technology for melting steel by electric arc furnace converter |
| CN1775959A (en) * | 2005-11-24 | 2006-05-24 | 广东韶钢松山股份有限公司 | Electric furnace to converter steel making production process |
| CN101580912A (en) * | 2009-06-19 | 2009-11-18 | 武汉钢铁(集团)公司 | Low carbon high sulfur free-cutting steel production process |
| CN103205529A (en) * | 2013-03-29 | 2013-07-17 | 江苏省沙钢钢铁研究院有限公司 | Zero-power consumption steel-making method using electric-arc furnace |
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Application publication date: 20190917 |