CN108950132A - A kind of electric furnace smelting device and method - Google Patents
A kind of electric furnace smelting device and method Download PDFInfo
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- CN108950132A CN108950132A CN201811060330.4A CN201811060330A CN108950132A CN 108950132 A CN108950132 A CN 108950132A CN 201811060330 A CN201811060330 A CN 201811060330A CN 108950132 A CN108950132 A CN 108950132A
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- China
- Prior art keywords
- electric furnace
- flue gas
- gas
- module
- gas cleaning
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Classifications
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
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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
Abstract
The present invention proposes a kind of electric furnace smelting device and method, it is related to technical field of ferrous metallurgy, electric furnace smelting device includes electric furnace unit and gas cleaning recovery unit, and electric furnace unit includes at least closed electric furnace, and closed electric furnace is removedly tightly connected with gas cleaning recovery unit.Gas cleaning recycling is carried out using flue gas of the gas cleaning recovery unit to generation during the entire process of closed electric furnace is powered and smelts.Electric furnace smelting device proposed by the present invention and method make to carry out smelting and off-gas recovery in the state of totally-enclosed, are not only able to reduce load and the energy consumption of electric stove dust, moreover it is possible to recycle the CO in electric furnace flue gas, energy-saving and emission-reduction.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, in particular to a kind of electric furnace smelting device and method.
Background technique
Fire door, electrode hole, upper furnace shell and the water cooling coil pipe gap of bell, bell smoke exhaust pipe in EAF Steelmaking Process at present
It is all to do so for opening-wide state primarily to the flue gas generated into furnace is mixed into a large amount of skies between external smoke exhaust pipe
Gas promotes CO (carbon monoxide) full combustion in flue gas using the oxygen in air, to reach the requirement diffused safely.But
Air has also brought a large amount of nitrogen and other inert gases into while bringing 21% oxygen into, other gas in addition to oxygen
Body still will enter in electric furnace, smoke processing system and dust pelletizing system, and nitrogen is split under high-temperature electric arc again after entering in furnace
Solution, so this smelting process will cause molten steel nitrogen pick-up, is added significantly to electric stove dust air quantity and energy consumption, on the other hand can't
CO in recovered flue gas, is unfavorable for energy conservation and environmental protection.Meanwhile as electric furnace in recent years is added using enhanced oxygen blowing spray carbon, large scale
The development of DRI (direct reduced iron) and large scale iron making water producing method, the CO content in electric furnace flue gas are substantially improved, electric furnace cigarette
It is higher and higher that gas recycles value.If firing the smelting process of method entirely using traditional open type, increase on the one hand may require that
The mixed air capacity of electric furnace flue gas increases the exhaust gas volumn of dedusting and increases dedusting energy consumption, another party while reducing dust removing effects
Face cannot recycle the CO in electric furnace flue gas, cause the loss using heat source.
Summary of the invention
The purpose of the present invention is to provide a kind of electric furnace smelting device and method, make to be smelted in the state of totally-enclosed
And off-gas recovery, it is not only able to reduce load and the energy consumption of electric stove dust, moreover it is possible to recycle the CO in electric furnace flue gas, energy-saving and emission-reduction.
In order to achieve the above objectives, the present invention proposes a kind of electric furnace smelting device, wherein the electric furnace smelting device includes electricity
Furnace unit and gas cleaning recovery unit, the electric furnace unit include at least closed electric furnace, the closed electric furnace with it is described
Gas cleaning recovery unit is removedly tightly connected.
Electric furnace smelting device as described above, wherein the closed electric furnace passes through with the gas cleaning recovery unit
Telescopic airtight connection mechanism is removedly tightly connected, and the telescopic airtight connection mechanism includes bell smoke exhaust pipe, outside
Smoke exhaust pipe and driving hydraulic cylinder, one end of the bell smoke exhaust pipe be sealedly connected on the bell of the electric furnace and with the electric furnace
Inner cavity be connected, the other end of the bell smoke exhaust pipe is equipped with fixedly connected part, one end of the external smoke exhaust pipe with it is described
Gas cleaning recovery unit is tightly connected, and the other end of the external smoke exhaust pipe is installed with mobile connection part, the mobile connection
Part and the fixedly connected part are cylindrical in shape, and the inner wall of the mobile connection part can be sealed with the outer wall of the fixedly connected part
Cooperation, the driving hydraulic cylinder are connected on the outer wall of the mobile connection part and the mobile connection part can be driven by near and far
From the fixedly connected part.
Electric furnace smelting device as described above, wherein the fixedly connected part and the mobile connection part are water cooling cone
Shape flange, the inner wall of the mobile connection part are equipped with the first conical seal (contact) face, and the outer wall of the fixedly connected part is correspondingly provided with the
Two conical seal (contact) faces, second conical seal (contact) face can be sealed with first conical seal (contact) face to be cooperated.
Electric furnace smelting device as described above, wherein be equipped with flue gas inspection mechanism in the external smoke exhaust pipe.
Electric furnace smelting device as described above, wherein the gas cleaning recovery unit includes being connected by flue
The pre- dirt pocket of the flue gas of connection, waste heat boiler module, gas cleaning module and off-gas recovery and storage module.
Electric furnace smelting device as described above, wherein be provided with second-time burning rifle on the side wall of the pre- dirt pocket of flue gas.
Electric furnace smelting device as described above, wherein the gas cleaning recovery unit further includes flue gas emission module, institute
Flue gas emission module is stated to be connected between the gas cleaning module and the off-gas recovery and storage module by reversal valve
On the flue.
Electric furnace smelting device as described above, wherein the inspection of foamed slag height is additionally provided on the inner wall of the closed electric furnace
Survey mechanism and molten steel temperature testing agency.
Electric furnace smelting device as described above, wherein the inner wall of the closed electric furnace is equipped with oxygen blast mechanism and spray carbon
Mechanism.
The present invention also proposes a kind of electric furnace smelting method, is smelted using electric furnace smelting device as described above, wherein
After charging into the closed electric furnace, the closed electric furnace is sealed and is tightly connected the closed electric furnace and institute
Gas cleaning recovery unit is stated, energization smelting is carried out to the closed electric furnace, utilizes institute during the entire process of being powered and smelting
It states gas cleaning recovery unit and gas cleaning recycling is carried out to the flue gas of generation.
Electric furnace smelting method as described above, wherein the gas cleaning recovery unit includes being connected by flue
The pre- dirt pocket of the flue gas of connection, waste heat boiler module, gas cleaning module and off-gas recovery and storage module, the flue gas remove in advance
Second-time burning rifle is provided on the side wall of dirt room；Flue gas carries out burning dedusting in the pre- dirt pocket of the flue gas；When by described closed
In the flue gas of formula electric furnace discharge when CO volumetric concentration < 5%, the second-time burning rifle is to the indoor flue gas of the pre- dedusting of the flue gas
Oxygen is blown into promote the full combustion of CO in flue gas and be down in safe range, when the flue gas by the closed electric furnace discharge
When middle CO volumetric concentration>=5% and O2 volumetric concentration<1%, the second-time burning rifle stops blowing into the pre- dirt pocket of the flue gas
Enter oxygen.
Electric furnace smelting method as described above, wherein the gas cleaning recovery unit further includes flue gas emission module, institute
Flue gas emission module is stated to be connected between the gas cleaning module and the off-gas recovery and storage module by reversal valve
On the flue；As CO volumetric concentration >=5% and O in the flue gas by the closed electric furnace discharge2Volumetric concentration < 1%
When, off-gas recovery module starts to carry out recycling deposit to inner flue gas of the stove；When CO body in the flue gas by the closed electric furnace discharge
When product concentration < 5%, flue gas is diffused by the flue gas emission module.
Compared with prior art, the invention has the characteristics that and advantage:
Electric furnace smelting device proposed by the present invention and method using closed electric furnace and make closed electric furnace and gas cleaning
Recovery unit is tightly connected, in this way, extraneous air is difficult or seldom enters in closed electric furnace in energization smelting process,
To reduce the exhaust gas volumn into gas cleaning recovery unit, the load and energy of gas cleaning recovery unit are thereby reduced
Consumption, and the oxygen brought by air for decreasing the reducibility gas produced in closed electric furnace carries out secondary oxidation or combustion
Burn, to improve the content of reducing gas in flue gas, be conducive to the reducibility gas (CO) generated in closed electric furnace into one
Step recycling and utilization；In addition, decreasing the red-hot electrode of furnace high-temperature by the dioxygen oxidation in air, to reduce consumption.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed by the invention in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding of the present invention, and
It is not the specific shape and proportional sizes for limiting each component of the present invention.Those skilled in the art under the teachings of the present invention, can
Implement the present invention to select various possible shapes and proportional sizes as the case may be.
Fig. 1 is the structural schematic diagram of electric furnace smelting device proposed by the present invention；
Fig. 2 is the structural schematic diagram of telescopic airtight connection mechanism in the present invention；
Fig. 3 is the schematic diagram of foamed slag height detection mechanism and molten steel temperature testing agency in the present invention.
Description of symbols:
1, electric furnace smelting device；10, electric furnace unit；
100, closed electric furnace；110, bell；
111, upper furnace shell；112, lower furnace shell；
113, fire door；114, bell and upper furnace shell sealing mechanism；
115, furnace cover lifting mechanism；120, electrode；
121, electrode holde；122, electrode hole sealing mechanism；
123, conductive cross arm；124, conductive cross arm and electrode rotary mechanism；
125, conductive cross arm elevating mechanism；126, short net；
127, transformer；130, with the charge pipe of sealing structure；
140, foamed slag height detection mechanism；150, molten steel temperature testing agency；
20, gas cleaning recovery unit；21, flue；
211, second-time burning rifle；22, the pre- dirt pocket of flue gas；
23, waste heat boiler module；24, gas cleaning module；
25, off-gas recovery and storage module；26, flue gas emission module；
27, reversal valve；30, telescopic airtight connection mechanism；
31, bell smoke exhaust pipe；32, external smoke exhaust pipe；
33, driving hydraulic cylinder；34 fixedly connected parts；
35, mobile connection part；36, flue gas inspection mechanism.
Specific embodiment
With reference to the drawings and the description of the specific embodiments of the present invention, details of the invention can clearly be understood.But
It is the specific embodiment of invention described herein, purpose for explaining only the invention, and cannot understand in any way
At being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that based on any possible change of the invention
Shape, these are regarded as belonging to the scope of the present invention.
As shown in Figure 1, the present invention proposes a kind of electric furnace smelting device 1, including electric furnace unit 10 and gas cleaning recycling list
Member 20, electric furnace unit 10 include at least closed electric furnace 100, and closed electric furnace 100 can be dismantled with gas cleaning recovery unit 20
Ground is tightly connected.
The present invention also proposes a kind of electric furnace smelting method, is smelted using electric furnace smelting device 1 as described above, Xiang Mi
After charging in enclosed electric furnace 110, closed electric furnace 100 is sealed and is tightly connected closed electric furnace 100 and gas cleaning
Recovery unit 20 carries out energization smelting to closed electric furnace 100, utilizes gas cleaning recycling during the entire process of being powered and smelting
Unit 20 carries out gas cleaning recycling to the flue gas generated in closed electric furnace 100.
Electric furnace smelting device proposed by the present invention and method using closed electric furnace 100 and make closed electric furnace 100 and cigarette
Gas Recovery Purifying unit 20 is tightly connected, in this way, extraneous air is difficult or seldom enters closed in energization smelting process
In electric furnace 100, to reduce the exhaust gas volumn into gas cleaning recovery unit 20, gas cleaning recovery unit is thereby reduced
20 load and energy consumption, and decrease the oxygen of the reducibility gas produced in closed electric furnace 100 brought by air
Secondary oxidation or burning are carried out, to improve the content of reducing gas in flue gas, be conducive to generate in closed electric furnace 100 is gone back
The further recycling and utilization of originality gas (CO)；In addition, decreasing the red-hot electrode of furnace high-temperature by the oxygen oxygen in air
Change, to reduce consumption.
In the present invention, the fire door 113 of closed electric furnace 100, upper furnace shell 111 and lower 112 seam crossing of furnace shell and upper furnace shell
It is sealed by sealing structure at gap, bell central electrode hole between 111 furnace walls and bell 110, to guarantee to be powered
When smelting, extraneous air is difficult or seldom enters in closed electric furnace 100.
The ancillary equipments such as reel cage 13 that electric furnace unit 10 further includes water cooling protective module 12 and electric furnace fascinates, can be used existing
Technology, herein without repeating.
In an optional example of the invention, as shown in Fig. 2, closed electric furnace 100 and gas cleaning recovery unit 20
It is removedly tightly connected by telescopic airtight connection mechanism 30, telescopic airtight connection mechanism 30 includes bell smoke exhaust pipe
31, external smoke exhaust pipe 32 and driving hydraulic cylinder 33, one end of bell smoke exhaust pipe 31 are sealedly connected on the bell of closed electric furnace 100
It is connected on 111 and with the inner cavity of closed electric furnace 100, the other end of bell smoke exhaust pipe 31 is equipped with fixedly connected part 34, external
One end of smoke exhaust pipe 32 and gas cleaning recovery unit 20 are tightly connected, and the other end of external smoke exhaust pipe 32 is installed with mobile connection
Part 35, fixedly connected part 34 and mobile connection part 35 are cylindrical in shape and mobile connection part 35 can correspond to and be set in fixedly connected part 34
Outside, the inner wall of mobile connection part 35 can seal with the outer wall of fixedly connected part 34 and cooperate, and driving hydraulic cylinder 33 is connected to mobile company
On the outer wall of fitting 35 and mobile connection part 35 can be driven close to or far from fixedly connected part 34.In this way, working as closed electric furnace 100
It fascinates and leaves the port, when needing to separate with gas cleaning recovery unit 20, using the driving mobile connection part 35 of driving hydraulic cylinder 33 and outside
Portion's smoke exhaust pipe 32 is separated with the realization of gas cleaning recovery unit 20 far from fixedly connected part 34, closed electric furnace 100, drives liquid
Cylinder pressure 33 can not influence inclining for closed 100 furnace body of electric furnace after mobile connection part 35 is pulled away from 34 certain distance of fixedly connected part
It is dynamic；When being ready for energization smelting, drive mobile connection part 35 close to fixedly connected part 34 using driving hydraulic cylinder 33, and make
The inner wall of mobile connection part 35 and the outer wall of fixedly connected part 34 seal and cooperate, and mobile connection part 35 and fixedly connected part 34 are closed
Afterwards, the sealed connection for realizing closed electric furnace 11 and gas cleaning recovery unit 20 prevents extraneous while electric furnace smelting smoke evacuation
Air enters flue (bell smoke exhaust pipe 31 and external smoke exhaust pipe 32)；During entire energization is smelted, driving hydraulic cylinder 33
Always it exerts a force to mobile connection part 35, to guarantee that the sealing of mobile connection part 35 and fixedly connected part 34 cooperates.
In an optional example of the invention, fixedly connected part 34 and mobile connection part 35 are water cooling cone-shaped flange,
The inner wall of mobile connection part 35 is equipped with the first conical seal (contact) face, and the outer wall of fixedly connected part 34 is correspondingly provided with the second cone seal
Face.When needing to be tightly connected, pushes mobile connection part 35 to fixedly connected part 34 using driving hydraulic cylinder, make the first cone seal
Face and the sealing of the second conical seal (contact) face cooperate.
In an optional example of the invention, external smoke exhaust pipe 32, which can according to need, is designed as bend pipe.
In an optional example of the invention, flue gas inspection mechanism (flue gas inspection instrument) is equipped in external smoke exhaust pipe 32
36.For detecting CO volumetric concentration in the flue gas being discharged by closed electric furnace 100.
In an optional example of the invention, gas cleaning recovery unit 20 includes being connected in series by flue 21
The pre- dirt pocket 22 of flue gas, waste heat boiler module 23, gas cleaning module 24 and off-gas recovery and storage module 25.
In an optional example of the invention, waste heat boiler module 23 can quick cooled flue gas, waste heat boiler mould
Block 23 to the cooling velocity of flue gas up to 250 DEG C/s or more, in this way can be by the flue-gas temperature by being discharged in closed electric furnace 100
300 DEG C or less are quickly down to by 1000 DEG C or more.
Gas cleaning module 24 can further purify the flue gas by being discharged in closed electric furnace 11, make the dustiness of flue gas
Enter the next step after reaching discharge standard.
In an optional example of the invention, gas cleaning recovery unit 20 further includes flue gas emission module 26, flue gas
Discharge module 26 is connected to the fume pipe between gas cleaning module 24 and off-gas recovery and storage module 25 by reversal valve 27
On road 21.Can control by reversal valve 27 by the flue gas that gas cleaning module 24 flows out is to enter off-gas recovery and storage module
25 carry out recycling storage or are diffused into flue gas emission module 26.
In an optional example of the invention, activated carbon adsorption is additionally provided between flue gas emission module 26 and reversal valve 27
Device 28.
In an optional example of the invention, second-time burning rifle 221 is provided on the side wall of the pre- dirt pocket 22 of flue gas.?
When CO concentration in flue gas < 20%, second-time burning rifle 221 can be sprayed into the pre- dirt pocket 22 of flue gas oxygen promote CO in flue gas into
Row full combustion.
In the present invention, the pre- dirt pocket 22 of flue gas, waste heat boiler module 23, gas cleaning module 24, off-gas recovery and storage
Storing module 25 and flue gas emission module 26 can use the prior art.
In an optional example of the invention, as shown in figure 3, being additionally provided with foamed slag on the inner wall of closed electric furnace 100
Height detection mechanism 140 and molten steel temperature testing agency 150.It is detected by foamed slag height detection mechanism 140 and molten steel temperature
Mechanism 150, can smelting situation in closed 100 furnace of electric furnace of continuous observation under air-tight state now.
In an optional example of the invention, foamed slag height detection mechanism 140 and molten steel temperature testing agency 150 are pacified
The adverse circumstances of the more dirt of furnace high-temperature, and foam slag height detection mechanism 140 and molten steel are born in water cooling protection mechanism
Temperature testing organization 150 can carry out installation and replacement outside furnace.
In an optional example of the invention, foamed slag height detection mechanism 140 and molten steel temperature testing agency 150 are adopted
Use the prior art.
In an optional example of the invention, oxygen blast mechanism and spray carbon machine are additionally provided on the inner wall of closed electric furnace 100
Structure.Can in closed 100 furnace of closed electric furnace by oxygen blast and spray carbon method or in which a kind of method and it is oxygen-containing or
Carbonaceous material reaction generates CO gas, and can control the concentration for generating CO gas by adjusting oxygen blast or spraying the intensity of carbon；Together
When, the CO gas that generates in closed electric furnace 100 is by the gas cleaning recovery unit 20 that is tightly connected with closed electric furnace 100
It recycles.
In the present invention, oxygen blast mechanism and Pen Tan mechanism can use the prior art.
In an optional example of the invention, when molten steel temperature testing agency 150 monitors that liquid steel temperature is higher than 1570
DEG C when, then start oxygen blast making foamed slag using oxygen blast mechanism；Foamed slag height detection mechanism 140 monitors that clinker height is lower than
When 300mm, then the oxygen blast of oxygen blast mechanism and Pen Tan mechanism and the ability of spray carbon are improved, it is on the contrary then reduce oxygen mechanism and Pen Tan mechanism
Oxygen blast and spray carbon ability.
In an optional example of the invention, flue gas enters after gas cleaning recovery unit 20 first in the pre- dedusting of flue gas
Room 22 carries out burning dedusting, as CO volumetric concentration < 5% in the flue gas being discharged by closed electric furnace 100 (by closed electric furnace
CO volumetric concentration is detected by the flue gas inspection mechanism 36 being arranged in external smoke exhaust pipe 32 in the flue gas of 100 discharges), second-time burning
Flue gas of the rifle 211 into the pre- dirt pocket 22 of flue gas is blown into oxygen to promote the full combustion of CO in flue gas and be down to safe range
It is interior, as CO volumetric concentration >=5% and O in the flue gas of closed electric furnace 100 discharge2When volumetric concentration < 1%, second-time burning rifle 211
Stop being blown into oxygen into the pre- dirt pocket 22 of flue gas.
In an optional example of the invention, when CO volumetric concentration >=5% in the flue gas being discharged by closed electric furnace 100
And O2When volumetric concentration < 1%, off-gas recovery and storage module 25 start to carry out recycling deposit to inner flue gas of the stove；When by closed
When CO volumetric concentration is less than 5% in the flue gas that electric furnace 100 is discharged, flue gas is diffused by flue gas emission module 26.
In an optional example of the invention, electric furnace smelting device 1 can also include control unit, driving hydraulic cylinder
33, flue gas inspection mechanism 36, reversal valve 27, second-time burning rifle 221, foamed slag height detection mechanism 140, molten steel temperature detection machine
Structure 150, oxygen blast mechanism and Pen Tan mechanism are electrically connected with control unit；In this way, flue gas inspection machine can be received by control
Structure 36, foamed slag height detection mechanism 140 and molten steel temperature testing agency 150 testing result and control reversal valve 27, secondary
The operation of combustion gun 221, oxygen blast mechanism and Pen Tan mechanism.Wherein, control unit and its can be with being electrically connected for above-mentioned component
Using the prior art, herein without repeating.
As shown in Figure 1, closed electric furnace 100 may include transformer 127, short net 126, conductive cross arm in the present invention
123, conductive cross arm and electrode rotary mechanism 124, conductive cross arm elevating mechanism 125, furnace cover lifting mechanism 115, electrode 120, electricity
Electrode holder 121, electrode hole sealing mechanism 122, the charge pipe 130 with sealing structure, bell 110, bell are close with upper furnace shell
Sealing mechanism 114, upper furnace shell 111, fire door 113, lower furnace shell 112.Wherein, electrode hole sealing mechanism 122 prevents outside air from entering
In furnace；Fire door 113 is closed fire door, is able to achieve and prevents outside air from entering in furnace while deslagging；Upper furnace shell 111 is under
Furnace shell 112 prevents outside air from entering in furnace using the closed structure of water cooling coil pipe and external application steel plate.
Now in conjunction with attached drawing 1, an embodiment of electric furnace smelting method proposed by the present invention is described in detail.It is specifically walked
It is rapid as follows:
Step 1: first time basket charging, first with conductive cross arm elevating mechanism 125 by conductive cross arm 123 and electrode
120 bottom ends are promoted at 111 top 200mm of furnace shell, then recycle furnace cover lifting mechanism 115 that bell 110 is jacked 500mm
Afterwards, after recycling conductive cross arm and electrode rotary mechanism 124 that electrode 120 and bell 110 are unscrewed to 72 ° or more of angle, smelting
50~70% furnace charges (steel scrap, carbon block, the pig iron, molten iron, DRI or mixture) of refining are added in furnace above upper furnace shell 111,
Then conductive cross arm and electrode rotary mechanism 124 are by above bell 110 and conductive cross arm 123 and 120 cycle of electrode to furnace shell, furnace
After bell 110 is declined the closure of 500mm and upper furnace shell 111 by lid elevating mechanism 115, the raise-lower hydraulic of furnace cover lifting mechanism 115
Cylinder will continue to decline 200mm and bell 110 is completely disengaged, and bell 110 has been fallen on upper furnace shell 111 by gravity, in order to prevent
Bell 110 slides, and upper 111 top of furnace shell is additionally provided with guiding fixed mechanism.It gives up it should be noted that step 1 is mainly used for being packed into
Steel, when not needing to be packed into steel scrap, electric furnace smelting method proposed by the present invention is then by step 2.
Step 2: furnace body is closed.The closure mechanism 114 of bell and upper furnace shell is then realized and upper furnace by the gravity of bell 110
Shell 111 seals, and the three-phase electrode hole on bell 110 is sealed by electrode hole sealing mechanism 122；The fire door 113 of electric furnace is
Closed fire door can prevent air to be entered in furnace in smelting process by fire door 113 and enter；The bell being installed on bell 110
Smoke exhaust pipe 31 is sealed with external smoke exhaust pipe 32 by fixedly connected part 34 and mobile connection part 35.
Step 3: be powered fusing.After completing step 2, transformer 127 begins through short net 126 and conductive cross arm 123 to electricity
120 power transmission of pole, then electrode 120 melts furnace charge；Entire fusion process be use closed structure carried out it is closed
Closed electric furnace 11 in carry out；
Step 4: second of basket charging, this step are mainly used for needing second when being packed into steel scrap, when not needing second
When secondary loading steel scrap, then by step 5.To the first melting batch materials 90% or more, transformer 127 can stop powering, and
After promoting electrode 120, remaining 30~50% second batch furnace charge is added in furnace according to mode described in step 1, then presses step 2
It is closed to carry out furnace body, is then carrying out energization fusing by step 3.
Step 5: being packed into DRI and slag material.To the first melting batch materials 90% or more, liquid state molten pool has been basically formed in furnace
Afterwards, DRI and slag material are initially added into.DRI and slag material after the charging system mixing by bell 110 with sealing structure
Charge pipe 130 is continuously packed into furnace by the speed of 20kg/MW.min, stops charging after reaching the additional amount set.
Step 6: carbon is sprayed in oxygen blast, this step is synchronous with step 5 to be carried out.After step 5 starts charging, using on furnace wall
Multifunctional furnace wall gun 160 (Pen Tan mechanism and oxygen blast mechanism) to molten bath in setting flow and ratio carry out oxygen blast and spray carbon,
Oxygen is sprayed into metal bath by adjusting the angle of spray gun, and carbon dust is injected in clinker, while according to foamed slag height
The monitoring result of testing agency 140 and molten steel temperature testing agency 150, the time of adjustment oxygen blast spray carbon and flow are spent, to guarantee
Reasonable foamed slag temperature and heating rate.When monitoring that liquid steel temperature is higher than 1570 DEG C, then start oxygen blast making foamed slag, steeps
When foam slag height detection mechanism 140 monitors clinker height lower than 300mm, then Multifunctional furnace wall gun control system is sent a signal to
System, to promote oxygen blast and spray the ability of carbon, ability that is on the contrary then reducing oxygen blast spray carbon.It should be noted that Multifunctional furnace wall gun
The prior art can be used.
Step 7: stirring heating, this step is synchronous with step 5 to be carried out.After step 5 starts charging, using mounted in furnace bottom
On air brick be blown into inert gas (nitrogen or argon gas) into furnace molten bath be stirred, to accelerate fusing, heating and chemistry
Reaction speed.
Step 8: smoke combustion dedusting, this step operation is through the entire smelting process of electric furnace.It is produced during electric furnace smelting
Raw flue gas is introduced into the pre- dirt pocket 22 (also referred to as burning dirt pocket) of flue gas by bell smoke exhaust pipe 31 and external smoke exhaust pipe 32, when
When flue gas inspection mechanism 36 detects CO concentration in flue gas < 5%, be mounted on burning dirt pocket side wall second-time burning rifle 211 to
The burning indoor flue gas of dedusting is blown into oxygen to promote the full combustion of CO in flue gas and be down in safe range, works as flue gas inspection
Mechanism 36 detects CO volumetric concentration >=5% and O in flue gas2When < 1%, it is mounted on the second-time burning rifle of combustion settling chamber side wall
211 stop being blown into oxygen into combustion settling chamber；
Step 9: flue gas is quickly cooled down, and flue gas enters waste heat boiler module 23 after being extracted from burning dirt pocket, through remaining
After hot pot oven module 23 is cooling, flue-gas temperature is down to 300 DEG C or less within 3 seconds；
Step 10: gas cleaning is handled subsequently into gas cleaning module 24, purified treated dust concentration
Reach requirement and enters back into off-gas recovery and memory module 25 or release later；
Step 11: off-gas recovery or release, after step 10, when the CO concentration in flue gas is fed back by flue gas inspection mechanism 36
Testing result >=5% and O2When < 1, off-gas recovery and storage module 25 start to carry out recycling deposit to inner flue gas of the stove, when CO body
When product concentration < 5%, flue gas is diffused by flue gas emission module 26.
Step 12: deslagging.Since step 6, clinker will be constantly generated in furnace, these clinkers are after accumulation to a certain extent
It can persistently be excluded by fire door 113, fire door 113 is closed fire door and prevents outside air from entering while may be implemented in deslagging
In furnace.
Step 13: tapping.When in furnace bath temperature and carbon content reach set objective after, turndown tapping can be carried out,
After tap reaches setting value, furnace body, which quickly returns, to incline to horizontal position, exposes tapping hole and guarantees there is 40% or so in furnace
Stay steel amount.
Step 14: filling sand and fettling.After tapping is completed, needs to clear up tapping hole and fill sand.Simultaneously
Resistance to material in furnace is checked and is repaired in time, the smelting of next furnace is got out.
For explaining in detail for the respective embodiments described above, purpose, which is only that, explains the present invention, in order to be able to
More fully understand the present invention, still, these descriptions cannot with any explanation at being limitation of the present invention, in particular,
Each feature described in different embodiments can also mutual any combination, so that other embodiments are formed, in addition to having
Opposite description is specified, these features should be understood to can be applied in any one embodiment, and be not limited merely to
Described embodiment.
Claims (12)
1. a kind of electric furnace smelting device, which is characterized in that the electric furnace smelting device includes electric furnace unit and gas cleaning recycling
Unit, the electric furnace unit include at least closed electric furnace, and the closed electric furnace can be torn open with the gas cleaning recovery unit
It is tightly connected with unloading.
2. electric furnace smelting device as described in claim 1, which is characterized in that the closed electric furnace and the gas cleaning are returned
It receives unit to be removedly tightly connected by telescopic airtight connection mechanism, the telescopic airtight connection mechanism includes bell row
Smoke pipe, external smoke exhaust pipe and driving hydraulic cylinder, one end of the bell smoke exhaust pipe are sealedly connected on the bell of the electric furnace simultaneously
It is connected with the inner cavity of the electric furnace, the other end of the bell smoke exhaust pipe is equipped with fixedly connected part, the external smoke exhaust pipe
One end and the gas cleaning recovery unit are tightly connected, and the other end of the external smoke exhaust pipe is installed with mobile connection part, institute
It states mobile connection part and the fixedly connected part is cylindrical in shape, and the inner wall of the mobile connection part can be with the fixedly connected part
Outer wall seal cooperation, the driving hydraulic cylinder is connected on the outer wall of the mobile connection part and can drive the mobile connection
Part is close and far from the fixedly connected part.
3. electric furnace smelting device as claimed in claim 2, which is characterized in that the fixedly connected part and the mobile connection part
It is water cooling cone-shaped flange, the inner wall of the mobile connection part is equipped with the first conical seal (contact) face, the outer wall of the fixedly connected part
It is correspondingly provided with the second conical seal (contact) face, second conical seal (contact) face can be sealed with first conical seal (contact) face to be cooperated.
4. electric furnace smelting device as claimed in claim 2, which is characterized in that be equipped with flue gas inspection machine in the external smoke exhaust pipe
Structure.
5. electric furnace smelting device as described in claim 1, which is characterized in that the gas cleaning recovery unit includes passing through cigarette
The pre- dirt pocket of flue gas, waste heat boiler module, gas cleaning module and the off-gas recovery and storage module that feed channel is connected in series.
6. electric furnace smelting device as claimed in claim 5, which is characterized in that be provided on the side wall of the pre- dirt pocket of flue gas
Second-time burning rifle.
7. electric furnace smelting device as claimed in claim 5, which is characterized in that the gas cleaning recovery unit further includes flue gas
Module is discharged, the flue gas emission module is connected to the gas cleaning module and the off-gas recovery and storage by reversal valve
On the flue between module.
8. electric furnace smelting device as described in claim 1, which is characterized in that be additionally provided with bubble on the inner wall of the closed electric furnace
Foam slag height detection mechanism and molten steel temperature testing agency.
9. electric furnace smelting device as described in claim 1, which is characterized in that the inner wall of the closed electric furnace is equipped with oxygen blast
Mechanism and Pen Tan mechanism.
10. a kind of electric furnace smelting method carries out smelting using electric furnace smelting device as in one of claimed in any of claims 1 to 9
Refining, which is characterized in that after charging into the closed electric furnace, the closed electric furnace is sealed and is tightly connected described
Closed electric furnace and the gas cleaning recovery unit, carry out energization smelting to the closed electric furnace, in the whole of smelting that be powered
Gas cleaning recycling is carried out using flue gas of the gas cleaning recovery unit to generation during a.
11. electric furnace smelting method as claimed in claim 10, which is characterized in that the gas cleaning recovery unit includes passing through
The pre- dirt pocket of flue gas, waste heat boiler module, gas cleaning module and the off-gas recovery and storage module that flue is connected in series,
Second-time burning rifle is provided on the side wall of the pre- dirt pocket of flue gas；Flue gas carries out burning dedusting in the pre- dirt pocket of the flue gas；
As CO volumetric concentration < 5% in the flue gas by the closed electric furnace discharge, the second-time burning rifle removes in advance to the flue gas
The indoor flue gas of dirt is blown into oxygen to promote the full combustion of CO in flue gas and be down in safe range, when by the closed electricity
CO volumetric concentration >=5% and O in the flue gas that fire grate goes out2When volumetric concentration < 1%, the second-time burning rifle stops to the flue gas
Oxygen is blown into pre- dirt pocket.
12. electric furnace smelting method as claimed in claim 11, which is characterized in that the gas cleaning recovery unit further includes cigarette
Gas discharges module, and the flue gas emission module is connected to the gas cleaning module and the off-gas recovery and storage by reversal valve
On the flue between storing module；As CO volumetric concentration >=5% and O in the flue gas by the closed electric furnace discharge2
When volumetric concentration < 1%, off-gas recovery module starts to carry out recycling deposit to inner flue gas of the stove；It is discharged when by the closed electric furnace
Flue gas in CO volumetric concentration < 5% when, flue gas is diffused by the flue gas emission module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811060330.4A CN108950132A (en) | 2018-09-12 | 2018-09-12 | A kind of electric furnace smelting device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811060330.4A CN108950132A (en) | 2018-09-12 | 2018-09-12 | A kind of electric furnace smelting device and method |
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| CN108950132A true CN108950132A (en) | 2018-12-07 |
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| CN201811060330.4A Pending CN108950132A (en) | 2018-09-12 | 2018-09-12 | A kind of electric furnace smelting device and method |
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| WO2004035837A1 (en) * | 2002-10-16 | 2004-04-29 | Sms Demag Ag | Revamping of a basic oxygen furnace into an electric furnace for making steel |
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| CN201514129U (en) * | 2009-06-15 | 2010-06-23 | 北京润弘达能源环保科技有限公司 | Enclosed type electrosmelting energy utilization system |
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| WO2004035837A1 (en) * | 2002-10-16 | 2004-04-29 | Sms Demag Ag | Revamping of a basic oxygen furnace into an electric furnace for making steel |
| CN201514129U (en) * | 2009-06-15 | 2010-06-23 | 北京润弘达能源环保科技有限公司 | Enclosed type electrosmelting energy utilization system |
| CN101581543A (en) * | 2009-06-17 | 2009-11-18 | 五矿（湖南）铁合金有限责任公司 | Recovering and utilizing method of energy smelted in closed electric furnace |
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