CN208917242U - A kind of full thin material steel scrap electric furnace smelting system - Google Patents
A kind of full thin material steel scrap electric furnace smelting system Download PDFInfo
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- CN208917242U CN208917242U CN201821329127.8U CN201821329127U CN208917242U CN 208917242 U CN208917242 U CN 208917242U CN 201821329127 U CN201821329127 U CN 201821329127U CN 208917242 U CN208917242 U CN 208917242U
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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
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Abstract
The utility model relates to electric furnace steel making field more particularly to a kind of full thin material steel scrap electric furnace smelting systems.The smelting system of the utility model includes transporter, suspender, electric arc furnaces, expansion chamber, cooling tower and deduster；Wherein, transporter includes continuous charging channel and preheating Transfer pipe, and the length in continuous charging channel is greater than the length than preheating Transfer pipe, and continuous charging channel and preheating Transfer pipe are parallel and on its interior；Wherein, continuous charging channel and one end of preheating Transfer pipe enter steel mouth with electric arc furnaces jointly and connect, and the continuous charging channel other end is located at below suspender；The preheating Transfer pipe other end is connect by pipeline with sedimentation chamber inlet；Expansion chamber outlet is connect with the entrance of cooling tower by keeping the temperature flue, and the outlet of cooling tower and the entrance of deduster connect.The full thin material steel scrap electric furnace smelting method and smelting system of the utility model have the advantages that environmentally friendly, process is simple, less energy consumption.
Description
Technical field
The utility model relates to electric furnace steel making field more particularly to a kind of full thin material steel scrap electric furnace smelting systems.
Background technique
Steel scrap as it is a kind of can the energy-saving recycling resource that uses of Infinite Cyclic, application potential is huge.China makes steel scrap ratio
Only 11%, steel scrap recycles level and differs greatly with world average level.Steel scrap cycle applications are steel industry development
Inexorable trend, China future development space is huge, and steel scrap reserves increase, " bar steel " goes out clear superposition Environmental Protection Situation and become to sternly making short stream
Journey is with the obvious advantage.
Electric-arc furnace steelmaking is, using steel scrap as the method for making steel of primary raw material, to pass through electrode and furnace using electric energy as heat source
Discharge the electric arc of generation between material, so that electric energy is changed into thermal energy in arc light, heats and melt metal charge and clinker, smelts each out
The steel and a kind of method for making steel of alloy of kind ingredient qualification.
However, there is also following deficiencies for traditional arc furnace steelmaking process:
(1) conventional thin material scrap smelting process requirement is by the pretreatment such as sorting, broken, then launch again electric furnace into
Row is smelted, and this processing route has that process generates a large amount of rubbish and needs secondary treatment, and broken processing energy
The consumption in source brings huge pressure to environment；
(2) current arc furnace smelts the mode for mostly using steel scrap hot metal charging, and a large amount of energy is obtained from molten iron, smelts
Efficiency and energy utilization rate are very low；
(3) it is slag making materials that electric-arc furnace steelmaking, which mostly uses fluorite, and still, fluorite can be reacted with many oxide in slag,
Fluoro-gas is generated, environment is seriously polluted, corrode equipment and damages the health of operator, moreover, waving with fluoro-gas
The slugging effect of hair, fluorite is gradually failed, so fluorite slugging action time is short, is unfavorable for the stabilization of foamed slag, is influenced to smelt
It goes on smoothly；
(4) existing arc furnace steeling process electric-arc furnace steelmaking raw material mix is complicated, and melting down phosphorus content fluctuation is big, full steel scrap smelting
Refine it is melting down after carbon content is low, molten steel viscosity is high, and limited by electric arc furnaces furnace type structure, molten bath flowing velocity is slow, dephosphorization power
Condition is poor, and smelting process dephosphorization is difficult；
(5) in traditional arc furnace smelting procedure, other than injecting oxygen and carbon dust, injecting carbon dioxide, natural is also needed
Gas, nitrogen or argon gas etc. have the shortcomings that smelting cost is high, smelting procedure is complicated.
(6) metallurgical industry is one of two English primary pollution sources, and two English properties are stable and are very easy to accumulate in vivo
It is tired, it is very big to the harm of human body, however, metallurgical industry at present proposes one kind simply and effectively two English of elimination or prevention not yet
Method.
Therefore, this field need it is a kind of it is environmentally friendly, process is simple, less energy consumption scrap smelting method and smelts system
System.
Utility model content
The purpose of this utility model is in view of the drawbacks of the prior art, to provide a kind of full thin material steel scrap electric furnace smelting method
And smelting system.
On the one hand, a kind of full thin material steel scrap electric furnace smelting method of the utility model, comprising the following steps:
(1) by thin material scrap baling at bundled scrap；
(2) bundled scrap is continuously introduced into ultra high electric arc furnace；
(3) power transmission operation, oxygen blast operation, blowing carbon dust and slag making is carried out to electric arc furnaces to operate；
(4) after the high-temperature flue gas that smelting process generates is to bundled scrap preheating, expansion chamber, cooling tower is successively delivered to and is removed
Dirt device, is finally emitted into the external world；
(5) tapping steel is carried out after smelting.
Above-mentioned full thin material scrap smelting method, the thin material steel scrap are inferior grade thin material steel scrap, wherein described
Inferior grade thin material steel scrap includes color steel tile, pop can and Automobile Plate.
Above-mentioned full thin material scrap smelting method, the thin material steel scrap are not necessarily to break process, directly pass through baling press
It is packaged into bundled scrap.
The maximum length of above-mentioned full thin material scrap smelting method, the bundled scrap is no more than continuous charging channel most
The 75% of small inner width, the maximum height of the bundled scrap are no more than the 60% of continuous charging channel minimum constructive height.
Above-mentioned full thin material steel scrap electric furnace smelting method, the power of the ultra high electric arc furnace is 10-20MVA, public
Capacity is referred to as 200-450 tons.
Above-mentioned full thin material steel scrap electric furnace smelting method, power transmission operation the power transmission starting the arc of smelting, melting stage and
The supply current of the heat of oxidation is respectively 68-69kA, 60-68kA and 68-69kA.
The oxygen pressure of above-mentioned full thin material steel scrap electric furnace smelting method, the oxygen blast operation is 1.0-1.6MPa,
In, it is respectively 1000-3000m in the power transmission starting the arc, melting stage and heat of oxidation oxygen flow3/h、4000-5000m3/ h and 5000-
7000m3/h。
Above-mentioned full thin material steel scrap electric furnace smelting method, the blowing carbon dust flow are 25-30kg/min, are blown carbon dust
Amount be 15-20kg/t steel.
Above-mentioned full thin material steel scrap electric furnace smelting method, slag making operation the following steps are included:
1) a defective material power transmission is filled, lime weight 1.0-2.0%NC is added, wherein nominal capacity of the NC for electric arc furnaces, unit:
Ton；
2) after molten bath is formed, the lime of 500-1000kg is added every 3-8min, the lime total amount of addition is 0.8-1.3%
NC；
3) it is complete it is molten after lime, dolomite and carbon dust be added into furnace according to slag condition at any time, it is ensured that foamed slag thickness reaches
600-1000mm；
4) heat of oxidation uses big quantity of slag stream slag operation；
5) the oxidation later period flows slag according to the content control of P elements in steel.Above-mentioned full thin material steel scrap electric furnace smelting side
Method, the tapping steel use and stay steel stream slag method, wherein staying steel amount in 10 stokehold phases is >=24%NC, between the 11-20 furnace period
Staying steel amount is 24-30%NC, and staying steel amount in 20 furnace later periods is >=30%NC.
Above-mentioned full thin material steel scrap electric furnace smelting method, temperature is 700- after the high-temperature flue gas preheats bundled scrap
1000 DEG C, then after expansion chamber settles pre- dedusting, then by keep the temperature flue be delivered to cooling tower with the speed of 200-400 DEG C/s
Suddenly it is cooled to 200-250 DEG C.
On the other hand, it the utility model discloses a kind of full thin material steel scrap electric furnace smelting system, including transporter, hangs
Tool, electric arc furnaces, expansion chamber, cooling tower and deduster；
Wherein, transporter includes continuous charging channel and preheating Transfer pipe, and the length in continuous charging channel is greater than preheating
The length of Transfer pipe, continuous charging channel and preheating Transfer pipe are parallel and on its interior；Wherein, continuous charging channel and
One end of preheating Transfer pipe enters steel mouth with electric arc furnaces jointly and connect, and the continuous charging channel other end is located at below suspender, preheating
The Transfer pipe other end is connect by pipeline with sedimentation chamber inlet；Expansion chamber outlet and the entrance of cooling tower are connected by heat preservation flue
It connects, the outlet of cooling tower and the entrance of deduster connect.
Above-mentioned full thin material steel scrap electric furnace smelting system, the electric arc furnaces are ultra high electric arc furnace, the cooling tower
For spray-type cooling tower.
Above-mentioned full thin material steel scrap electric furnace smelting system, the deduster are Low-Pressure Pulse Bag Filter.
The technical solution of the utility model have it is following the utility model has the advantages that
(1) the utility model will be by will directly be packaged into briquetting without the pretreated thin material steel scrap such as sorting, broken
It is smelted, not only saves process, reduce equipment and personnel investment, improve efficiency, also reduce the broken sorting of steel scrap
The secondary waste pollution that process generates；
(2) the utility model preheats the high-temperature flue gas that smelting process generates to bundled scrap, improves the energy
Utilization rate reduces the electric quantity consumption of electric arc furnaces in smelting process；
(3) the utility model by by the flue gas of pre- dedusting in cooling tower chilling, can effectively inhibit even to be eliminated complete
Two English that scrap smelting flue gas generates greatly and during scrap smelting, considerably reduce environmental pressure；
(4) the utility model controls by reasonable distribution smelting process power supply system and rationally oxygen blown intensity and rhythm,
The utilization rate for improving the energy reduces the electric quantity consumption of electric arc furnaces in smelting process；
(5) the utility model can be removed fast and effeciently complete useless by improving full steel scrap electric arc furnace smelting slag making operation
The objectionable impurities elements such as [P], [S] during steel smelting improve the service life of electric arc furnaces inner wall refractory brick, improve furnace life, drop
Low use cost.
Detailed description of the invention
Fig. 1 is the process flow chart of the full thin material steel scrap electric furnace smelting method of the utility model.
Fig. 2 is the full thin material steel scrap electric furnace smelting system schematic of the utility model；
It 1 is wherein transporter, 1a is continuous charging channel, 1b is preheating Transfer pipe, 2 is suspender, 3 is electric arc furnaces, 4
It is cooling tower for expansion chamber, 5,6 is sack cleaner.
Specific embodiment
It is practical to this by following specific embodiments in order to fully understand the purpose of this utility model, feature and effect
It is novel to elaborate.The process of the utility model in addition to following the description, remaining be all made of this field conventional method or
Device.Following vocabularies of terms are unless otherwise stated, all have the normally understood meaning of those skilled in the art.
A kind of full thin material steel scrap electric furnace smelting method of the utility model is that full thin material bundled scrap ultra high power is big
Electric furnace green smelting process.By the way that the inferior grade thin material steel scrap of unbroken processing is directly packaged into big briquetting, then super
High power electric furnace is smelted using 100% bundled scrap carries out melting to briquetting, reduces two generated in steel scrap shattering process
Secondary refuse pollution.Meanwhile bundled scrap is preheated using high-temperature flue gas by using scrap preheater, improve the energy
Utilization rate, reduce the electric quantity consumption of electric arc furnaces in smelting process；Using evaporation-cooled device, steel scrap smelting is effectively removed
The harmful substances such as two English that refining process generates, greatly reduce environmental pressure.
On the one hand, as shown in Figure 1, the utility model provides a kind of full thin material steel scrap electric furnace smelting method, including with
Lower step:
(1) by thin material scrap baling at bundled scrap.
Wherein, the thin material steel scrap is inferior grade thin material steel scrap, including but not limited to color steel tile, pop can and automobile
Plate.
The utility model uses the reason of thin material steel scrap are as follows: from a cost perspective, the useless price of thin material price specific gravity is low
Very much, has cost advantage；Secondly, if a large amount of thin material steel scrap indigestion in society, will be brought serious in terms of environmental angle
Environmental pollution has environment-friendly advantage.
The use of thin material is first to be crushed in traditional handicraft, then sorts, it is broken after solid refuse need extra process
Or landfill, it brings twice using the energy and manpower and energy waste.And the smelting process of the utility model, thin material is direct
It is packaged into thin material briquetting by baling press, electric furnace smelting is then added.Side of the utility model two steps of broken sorting processing
Method becomes step processing, not only saves process, reduces equipment and personnel investment, improves efficiency, it is broken to also reduce steel scrap
The secondary waste pollution that broken sort process generates.
Wherein, the maximum length of the bundled scrap is no more than the 75% of continuous charging channel minimum inner width, the steel scrap
The maximum height of briquetting is no more than the 60% of continuous charging channel minimum constructive height, to avoid occurring channel in operational process getting stuck
Phenomenon.
(2) bundled scrap is continuously introduced into ultra high electric arc furnace.
In some embodiments, bundled scrap is delivered on continuous charging channel by suspender.
Wherein, steel scrap is delivered to ultra high electric arc furnace according to 1.2-1.6%NC/ minutes rates, wherein NC is public affairs
Claim capacity.
Wherein, the power of the ultra high electric arc furnace is 10-20MVA, and nominal capacity is 200-450 tons.Some excellent
In the embodiment of choosing, the ultra high electric arc furnace is Consteel electric furnace.
Wherein, Consteel electric furnace has the characteristics that productivity is high, smelting cycle is short, the cost of electric energy is low, production environment is good.
(3) power transmission operation, oxygen blast operation, blowing carbon dust and slag making is carried out to electric arc furnaces to operate；
In some preferred embodiments, power transmission operation is executed according to the specified value of powering mode in setting program.
Wherein, the power transmission operation is according to certain power supply system in the power transmission starting the arc, melting stage, the heat of oxidation in each stage pair
Electric arc furnaces carries out.Specific each stage power supply system of smelting is shown in Table 1.
Table 1 respectively smelts stage power supply system
| The smelting stage | The power transmission starting the arc | Melting stage | The heat of oxidation |
| Voltage class | 8-11 | 12-16 | 8-11 |
| Electric current kA | 68-69 | 60-68 | 68-69 |
| Voltage V | 1020-1110 | 1140-1260 | 1020-1110 |
| Bath temperature DEG C | 1540-1550 | 1540-1550 | 1590-1610 |
Wherein, power transmission starting the arc stage continued power 2-3min, melting stage power supply 25-35min, the heat of oxidation supply power to smelting knot
Beam.
By using power supply system described in table 1, the utilization rate of the energy can be improved, reduce electric arc furnaces in smelting process
Electric quantity consumption, and significantly reduce the impact caused by power grid of smelting process curent change.
Through implementing, power consumption≤393kWh/t steel of ton steel is powered according to the power supply system of the utility model.This is practical
Novel power consumption is much smaller than the power consumption of existing full steel scrap electric arc furnace smelting method of supplying power to, improves the utilization rate of the energy.
Wherein, in oxygen blast operation, oxygen pressure requires to be 1.0-1.6MPa, and the oxygen supply system according to shown in table 2
It carries out.
The utility model carries out oxygen blast operation under big pressure and big flow, so that the range of oxygen is farther, is conducive to mention
The penetration power of high oxygen can enter inside molten steel through foamed slag, enhance the mixing effect to molten steel bath, so that molten steel temperature
Degree homogenization, enhances oxygen blown physical effect and chemical energy effect.
In some preferred embodiments, during oxygen blast, should according to response situation chemical in furnace to oxygen flow into
Row control.
Table 2 respectively smelts stage oxygen supply system
| The smelting stage | The power transmission starting the arc | Melting stage | The heat of oxidation |
| Oxygen blast intensity | Hypoxemia | Low, middle oxygen | Middle and high oxygen |
| Oxygen flow (m3/h) | 1000-3000 | 4000-5000 | 5000-6000 |
Further, molten bath preliminarily forms, and after oxygen blast starts, can blow carbon dust according to clinker situation point.Preferably, described
Carbon dust flow control is blown in 25-30kg/ minutes ranges (consuming by 15-20kg/t steel, be blown 45 minutes and calculate).Full thin material
Molten steel phosphorus content is low after bundled scrap fusing, is not achieved and smelts the purpose that gas decontamination is removed in oxidation, thus needs to increase additional
Carbon materials come guarantee technique requirement.
The utility model, by being blown into oxygen and blowing carbon dust in molten steel, increases in electric arc furnaces in smelting process
Chemical energy reduces the consumption of the resistance to material such as electrode and refractory brick to reduce the duration of heat and the power consumption of electric arc furnaces.
Wherein, slag making operation the following steps are included:
1) the first furnace fills a defective material 0.14-0.16NC power transmission, and allowing to be added lime weight 1.0%-2.0%NC, (NC is should
The nominal capacity of electric arc furnaces, unit ton), in favor of early stage submerged arc and remove [P] element operation.
2) add a collection of lime, every batch of dosage 500-1000kg or so every 3-8min after molten bath is formed, altogether addition 3 times, always
Amount is 0.8%-1.3%NC.
3) lime, dolomite and carbon dust are added into furnace according to slag condition at any time after fine melt, it is ensured that foamed slag thickness reaches
600-1000mm, total dosage: lime 50kg/t, dolomite 15kg/t steel.
Wherein, the dolomite in step 3) can be replaced by the magnesium ball of content of MgO >=60%, and the magnesium ball being added in electric arc furnaces is total
Amount is ‰ NC of 3-5.
Wherein, the addition total amount of the lime is 50-60kg/t steel, preferably 50kg/t steel；The addition of the dolomite is total
Amount is 14-18kg/t steel, preferably 15kg/t steel；The addition total amount of the carbon dust is 17-24kg/t steel, preferably 18kg/t steel.
4) heat of oxidation quickly removes [P] element using big quantity of slag stream slag operation.
Specifically, big quantity of slag stream slag operation includes: to be tilted a certain angle electric furnace with eccentric bottom (according to furnace to furnace slag notch
Body structure is different, general 5-15 degree), surface layer fusing slag can largely overflow automatically (outflow), and with [P], [S] in molten steel
Equal impurity elements.
5) the oxidation later period is according to [P] constituent content in steel, suitable control stream slag.
Liquid steel sampling is analyzed specifically, retrodeviating heart district from furnace, [P] is wanted if being higher than internal control index in the chemical component of molten steel
It asks, then continues to add slag material, by slag making-stream slag process, gradually remove the impurity elements such as [P] in molten steel.
Preferably, oxygen blast should be used in combination with foamed slag, and add lime and blowing carbon dust at any time according to foamed slag effect,
To guarantee there is suitable foamed slag in furnace.By above-mentioned slagging method, it can make the content of P elements in molten steel that can be reduced to smelting
The internal control of steelmaking kind cost [P] content is horizontal, and average furnace life improves 5-8 furnace.
(4) after the high-temperature flue gas that smelting process generates is to bundled scrap preheating, expansion chamber, cooling tower is successively delivered to and is removed
Dirt device, is finally emitted into the external world.
Wherein, the high-temperature flue gas that smelting process generates, by preheating Transfer pipe to the bundled scrap in continuous charging channel
It is preheated.Temperature is 700-1000 DEG C after high-temperature flue gas goes out to preheat Transfer pipe, by combustion settling chamber (residence time 1-
After 2s) settling pre- dedusting, flue gas passes through heat preservation flue again and enters cooling tower, and flue-gas temperature is in cooling tower with 200-400 DEG C/s
Rate be chilled to 200 DEG C -250 DEG C, it is cold through evaporating to effectively inhibit even to be eliminated two English generated during scrap smelting
But a flue gas enters Low-Pressure Pulse Bag Filter progress refined dedusting via dedusting smoke pipe after.
Wherein, the temperature for preheating Transfer pipe is controlled more than 700 DEG C (i.e. decomposition temperatures of two English), it on the one hand can be with
It decomposes two English in high-temperature flue gas sufficiently, on the other hand can prevent decomposed two English from giving birth to again in preheating Transfer pipe
At.
Wherein, flue gas is chilled to 200-250 DEG C in cooling tower with the rate of 200-400 DEG C/s, two English can be made
" de novo formation " reaction regeneration is at minimum.
Wherein, the cooling tower is water cooling tower.
It is further preferred that the high-temperature flue gas is 1-2s in the residence time of expansion chamber.
It should be noted that the utility model step (4) and the sequence of some operations in step (3) are not fixed, that is,
Step (4) can carry out in order with step (3), can carry out simultaneously, can also first carry out step (4) and carry out step (3) afterwards.
(5) sample detection after sample passes, terminates to smelt and simultaneously carries out tapping steel.
Wherein, the tapping steel stays steel amount to be determined according to furnace life specific as follows: 10 furnaces using staying steel that slag method is stayed to carry out
Early period >=24%NC, 24%-30%NC between the 11-20 furnace period, in 20 furnace later periods, staying steel amount >=30%NC, (NC is the public affairs of the electric arc furnaces
Claim capacity, unit ton).
On the other hand, as shown in Fig. 2, the utility model provides a kind of full thin material steel scrap electric furnace smelting system, including
Transporter 1, suspender 2, electric arc furnaces 3, expansion chamber 4, cooling tower 5 and deduster 6；
Wherein, transporter 1 includes continuous charging channel 1a and preheating Transfer pipe 1b, the preheating of continuous charging channel 1a ratio
Transfer pipe 1b long, continuous charging channel 1a are parallel and are located inside preheating Transfer pipe 1b, wherein continuous charging channel 1a and
One end of preheating Transfer pipe 1b enters steel mouth with electric arc furnaces 3 jointly and connect, and the continuous charging channel 1a other end is located under suspender 2
Side, the preheating Transfer pipe 1b other end are connect by pipeline with 4 entrance of expansion chamber；The outlet of expansion chamber 4 and the entrance of cooling tower 5 are logical
The connection of heat preservation flue is crossed, the outlet of cooling tower 5 is connect with the entrance of deduster 6.
Preferably, the electric arc furnaces 3 is ultra high electric arc furnace, and the cooling tower 5 is water cooling tower, the deduster
For Low-Pressure Pulse Bag Filter.
Embodiment (secrecy experiment)
Further illustrate that the utility model, the present embodiment are therefore will not illustratively below by the mode of embodiment
The utility model is limited among the embodiment described range.In the following examples, the experimental methods for specific conditions are not specified, presses
More solito and condition.
(1) the inferior grades thin material steel scrap such as color steel tile, pop can, Automobile Plate is not necessarily to break process, directly passes through packing
Machine is packaged into big briquetting of the size less than 2000 × 600 × 500mm.
(2) by suspender 2 will by bag-packaged bundled scrap be sent into continuous charging channel 1a on, continuous charging channel 1a with
4-5 tons/minutes of rate uninterruptedly melts briquetting 220 tons of electric arc furnaces 3 (NC=320 tons of nominal capacity) of feeding
Refining.
(3) power transmission operation is carried out to electric arc furnaces 3, each smelting stage power supply system is as shown in table 3:
Stage power supply system is respectively smelted in 3 embodiment 1 of table
| The smelting stage | The power transmission starting the arc | Melting stage | The heat of oxidation |
| Voltage class | 8-11 | 12-16 | 8-11 |
| Electric current kA | 68-69 | 60-68 | 68-69 |
| Voltage V | 1020-1110 | 1140-1260 | 1020-1110 |
| Bath temperature DEG C | 1540-1550 | 1540-1550 | 1590-1610 |
Wherein, power transmission starting the arc stage continued power 2-3min, melting stage power supply 25-35min, the heat of oxidation supply power to smelting knot
Beam.
(4) oxygen blast operation is carried out with oxygen blast intensity shown in table 4 in smelting process；Oxygen pressure requires 1.2-
1.6MPa, oxygen blast process are reinforced chemical response situation in observation furnace, are controlled according to the extent of reaction oxygen flow.Oxygen supply system
Degree is shown in Table 4:
Stage oxygen supply system is respectively smelted in 4 embodiment 1 of table
| The smelting stage | The power transmission starting the arc | Melting stage | The heat of oxidation |
| Oxygen blast intensity | Hypoxemia | Low, middle oxygen | Middle and high oxygen |
| Oxygen flow (m3/h) | 1500-2000 | 4000-5000 | 5000-6000 |
(5) molten bath preliminarily forms, and after oxygen blast starts, is started to be blown carbon dust according to clinker situation, flow control is in 25-
30kg/min range.
(6) lime, dolomite etc. are added into furnace at any time according to clinker situation in smelting process and carry out slag making operation:
A) dress 40-60t expects power transmission to empty furnace for the first time, allows that lime 5000kg is added；
B) add a collection of lime, every batch of dosage 1000kg or so every 5-8min after molten bath is formed, be added 3 times altogether；
C) lime, dolomite and carbon dust is added according to slag condition in the heat of oxidation into furnace at any time, it is ensured that foamed slag thickness reaches
600-1000mm, total dosage: lime 50kg/t, dolomite 15kg/t steel, carbon dust 18kg/t steel, fusing latter stage use the big quantity of slag
Flow slag operation；
D) the oxidation later period is according to [P] constituent content in steel, suitable control stream slag.
(7) exhaust gas volumn that smelting process generates is about 200000-300000Nm3/ h, flue-gas temperature are 1000-1200 DEG C,
Dust contained flue gas concentration~8g/Nm3, two English contents are 8-12mg/Nm3.In transporter 1, positioned at the high temperature of preheating Transfer pipe 1b
Flue gas is preheated to continuous charging channel 1a bundled scrap is located at.Positioned at the temperature of the flue gas of the outlet preheating Transfer pipe 1b
800-1000 DEG C, it is that 20m × 7m × 10m expansion chamber 4 is sunk that high-temperature flue gas, which enters a size by 90 ° of watercooling elbows,
Drop, the flue gas in expansion chamber after 2s settles pre- dedusting pass through heat preservation flue again and enter cooling tower 5, the cigarette in cooling tower 5
Temperature degree is chilled to 200 DEG C -250 DEG C with the rate of 200-400 DEG C/s, after evaporation is cooling a flue gas via dedusting smoke pipe into
Enter Low-Pressure Pulse Bag Filter 6 and carries out refined dedusting.Finally, the gas to refined dedusting detects, wherein two English contents are
0.35-0.45mg/Nm3, meet the discharge standard of PCDD/F and two English.
(8) the technique requirement of steel grade is smelted when [C] in molten steel composition, [P] constituent content meet, and to measuring temp of molten steel,
When liquid steel temperature reaches 1590-1610 DEG C, judging to smelt terminates.Then using staying steel that slag method is stayed to carry out tapping steel, steel is stayed
80-90t。
The full thin material scrap smelting method for repeatedly being implemented the utility model finds the smelting process electricity of the utility model
Consumption≤415kWh/t steel, oxygen consumption≤45Nm3/ t steel is blown amount≤20kg/t steel of carbon dust.Comprehensive production cost is much smaller than existing
Full steel scrap electric arc furnace smelting cost, therefore, the utility model has broad application prospects in electric furnace steel making field.
The utility model is hereinbefore disclosed with preferred embodiment, but it should be understood by those skilled in the art that,
These embodiments are only used for describing the utility model, but should not be understood as limitation the scope of the utility model.It should be noted that all
It is the variation and displacement equivalent with these embodiments, should all be set as being covered by the scope of the claims of the utility model.Therefore,
The protection scope of the utility model should be subject to range defined in claims.
Claims (3)
1. a kind of full thin material steel scrap electric furnace smelting system, which is characterized in that including transporter, suspender, electric arc furnaces, expansion chamber,
Cooling tower and deduster；
Wherein, transporter includes continuous charging channel and preheating Transfer pipe, and the length in continuous charging channel is greater than preheating transmission
The length in channel, continuous charging channel and preheating Transfer pipe are parallel and on its interior；Wherein, continuous charging channel and preheating
One end of Transfer pipe enters steel mouth with electric arc furnaces jointly and connect, and the continuous charging channel other end is located at below suspender；Preheating transmission
The channel other end is connect by pipeline with sedimentation chamber inlet；Expansion chamber outlet is connect with the entrance of cooling tower by keeping the temperature flue,
The outlet of cooling tower and the entrance of deduster connect.
2. full thin material steel scrap electric furnace smelting system according to claim 1, which is characterized in that the electric arc furnaces is superelevation
Power electric arc furnace, the cooling tower are spray-type cooling tower.
3. full thin material steel scrap electric furnace smelting system according to claim 1 or 2, which is characterized in that the deduster is
Low-Pressure Pulse Bag Filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN108676963A (en) * | 2018-08-16 | 2018-10-19 | 江苏久华环保科技股份有限公司 | A kind of full thin material steel scrap electric furnace smelting method and smelting system |
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