CN105969936B - A kind of electric arc furnaces uses the steelmaking process control method and system of pre-heated oxygen rifle - Google Patents
A kind of electric arc furnaces uses the steelmaking process control method and system of pre-heated oxygen rifle Download PDFInfo
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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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- 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 invention belongs to EAF steelmaking technology field, provide the steelmaking process control method that a kind of electric arc furnaces uses pre-heated oxygen rifle, the step of including arc furnace smelting procedure is decomposed into multiple smelting stages, the step of judging the residing smelting stage in arc furnace smelting procedure, and oxygen flow and oxygen temperature are adjusted at times in each smelting stage, the step of realizing oxygen jet oxidability and impact stirring capacity independent control；The adjustable range of oxygen flow is 100 4000Nm3/ h, oxygen temperature adjustable range are 25 500 DEG C.Beneficial effects of the present invention are：Compared with traditional approach, oxygen jet has more excellent jet characteristics, oxygen utilization rate improves 2% ~ 5%, decarbonization rate is accelerated, decarburization time shortens more than 1min, and finishing slag TFe reduces by more than 2%, and steel technology reduces more than 5kg/t, with significant effect of optimization and economic benefit, have a extensive future.
Description
Technical field
The invention belongs to EAF steelmaking technology field, more particularly to a kind of electric arc furnaces uses the steel-making of pre-heated oxygen rifle
Process control method and system.
Background technology
At present, the oxygen supply of electric-arc furnace steelmaking is mainly completed by the oxygen rifle above molten bath, and oxygen gun sprayer uses
Laval nozzle structure produces supersonic jet, penetrates furnace gas and slag blanket and steel contacts using the kinetic energy of oxygen jet and occurs
Reaction.
Supersonic jet caused by electric arc furnace oxygen lance is blown into molten bath, on the one hand provides the oxygen needed for the oxidation of molten bath, separately
On the one hand stirring work(needed for melting bath stirring is provided；The different smelting stages of electric arc furnaces are different with stirring work(demand to oxygen-supplying amount,
Rationally control oxygen-supplying amount and stirring work(are significant to improving electric arc furnace smelting efficiency.
In steel-making course of the electric arc furnace, wall lance size and position be it is fixed, oxygen flow be in smelting process only
One adjustable oxygen supply parameter, the impact stirring capacity of oxygen jet change with the change of oxygen flow, can not realize oxygen stream
The independent control of amount and impulsive force；The change of oxygen flow causes oxygen rifle to be operated under off-design behaviour simultaneously, further deteriorates
The jet characteristics of supersonic jet, reduce the impact mixing effect of oxygen utilization rate and oxygen jet to molten bath.
Patent No. ZL201210233080.6, entitled " a kind of preheated oxygen improves the oxygen furnace steel side of effluxvelocity
The patent of method " discloses the high-temperature oxygen being preheated by oxygen rifle injection, can dramatically increase the effluxvelocity of oxygen.It is but existing
Single parameter, oxygen jet oxidability and impact stirring capacity are supplied oxygen in electric-arc furnace steelmaking production can not independent control.
The content of the invention
The purpose of the present invention is exactly overcome the deficiencies in the prior art, there is provided a kind of electric arc furnaces uses the refining of pre-heated oxygen rifle
Steel course control method for use and system, solve and supply oxygen that parameter is single, oxygen jet energy of oxidation in the production of existing electric-arc furnace steelmaking
Power and impact stirring capacity can not independent control the problem of, based on the process requirements in different smelting stages, adjust at times
Oxygen flow and oxygen temperature, realize oxygen jet oxidability and impact the independent control of stirring capacity, improve electric arc furnaces smelting
Efficiency and oxygen utilization efficiency are refined, reduces energy expenditure and metal charge consumption.
A kind of electric arc furnaces of the present invention uses the steelmaking process control method of pre-heated oxygen rifle, including：By electric arc furnace smelting mistake
Journey is decomposed into the step of multiple smelting stages, the step of judging the residing smelting stage in arc furnace smelting procedure, and each
Oxygen flow and oxygen temperature are adjusted at times in the smelting stage, realize oxygen jet oxidability and impact stirring capacity
The step of independent control.
Further, the adjustable range of oxygen flow is 100-4000Nm3/ h, oxygen temperature adjustable range are 25-500
℃。
Further, the multiple smelting stage includes：Oxygen blast fluxing stage, making foamed slag dephosphorization stage, quick decarburization
Stage, blowing latter stage.
Further, the scope of the fluxing stage oxygen flow of oxygen blast is 500-2000Nm3/h；The making foamed slag dephosphorization stage
The scope of oxygen flow is 1000-3000Nm3/ h, the scope of the oxygen flow of quick decarburizing phase is 2000-4000Nm3/ h, blows
The scope for refining the oxygen flow in latter stage is 1500-3000Nm3/h。
Further, the scope of the fluxing stage oxygen temperature of oxygen blast is 200-500 DEG C；The oxygen in making foamed slag dephosphorization stage
The scope of temperature is 25-300 DEG C, and the scope of the oxygen temperature of quick decarburizing phase is 100-300 DEG C, the oxygen temperature in latter stage of blowing
The scope of degree is 300-500 DEG C.
Further, the steelmaking process control method is completed by control system, and the control system includes：The working of a furnace is sentenced
Disconnected module, requirement analysis module, flow rate calculation module, temperature computation module, oxygen supply execution module；Stove is connect before requirement analysis module
Condition judge module, flow rate calculation module and temperature computation module are followed by, it is described to be followed by flow rate calculation module and temperature computation module
It is followed by supplying oxygen execution module.
Further, above-mentioned steelmaking process control method specifically includes following steps：
Step 1: judge to smelt the residing stage；Since the first batch of material adds electric arc furnaces, working of a furnace judge module is sentenced in real time
It is disconnected to smelt the residing stage：Oxygen blast fluxing stage, making foamed slag dephosphorization stage, quick decarburizing phase or blowing latter stage；Work as judgement
When steelmaking process will enter next stage, by phase characteristic information transfer to requirement analysis module；The phase characteristic packet
Include：Burden structure, the duration of heat, oxygen-supplying amount, bath temperature, electrode input power, the image information of high temperature imaging device feedback；
Step 2: calculate oxygen supply demand characteristic index；Requirement analysis module calculates according to the phase characteristic information collected
Go out to supply oxygen demand characteristic index I：
I=IO×10+II；
Wherein：IO、IIRespectively oxidisability demand index and impact demand index；Oxygen blast fluxing stage, IOFor 2-5, II
For 4-5；Making foamed slag dephosphorization stage, IOFor 5-6, IIFor 4-5；Quick decarburizing phase, IOFor 7-9, IIFor 7-8；Blow latter stage, IO
For 5-7, IIFor 8-9；
Step 3: calculate oxygen flow；Oxidisability demand index I in flow rate calculation module obtaining step twoO, according to public affairs
Formula Q=IO/8×Q0Oxygen flow Q, wherein Q is calculated0For the design discharge of pre-heated oxygen rifle, the oxygen stream that will be calculated
Numerical quantity is transferred to oxygen supply execution module；
Step 4: calculate oxygen temperature；Oxidisability demand index I in temperature computation module obtaining step twoOAnd impact
Property demand index IIAfterwards, according to formulaOxygen temperature is calculated, whereinIt is for amendment with ω
Number, T0For the design maximum temperature of pre-heated oxygen rifle；The oxygen temperature being calculated is transferred to oxygen supply execution module；
Step 5: oxygen flow and oxygen temperature are adjusted to calculated value；Supply oxygen execution module will be Step 3: obtain in step 4
To oxygen flow and oxygen temperature numerical value be shown in operation interface, by operating personnel confirm execute instruction after, oxygen supply perform
Module controls corresponding valve group and heating element heater via fieldbus and PLC, and execution is controlled to oxygen flow and oxygen temperature；
In production process, the real-time Correction and Control parameter of data that control system is fed back according to measuring instrument.
Present invention also offers the steelmaking process control system that a kind of electric arc furnaces uses pre-heated oxygen rifle, including：The working of a furnace is sentenced
Disconnected module, requirement analysis module, flow rate calculation module, temperature computation module, oxygen supply execution module；Stove is connect before requirement analysis module
Condition judge module, is followed by flow rate calculation module and temperature computation module, the flow rate calculation module and temperature computation module after
Connect oxygen supply execution module；
Further, working of a furnace judge module real-time judge smelts the residing stage, when judging that it is next that steelmaking process will enter
During the stage, by phase characteristic information transfer to requirement analysis module；
Requirement analysis module calculates oxygen supply demand characteristic index according to the phase characteristic information collected；
After flow rate calculation module obtains oxygen supply characteristic index, oxygen flow is calculated, and the oxygen flow is transmitted
Give oxygen supply execution module；Oxygen flow calculate can binding model and database optimizing, obtain optimal oxygen flow；
After temperature computation module obtains oxygen supply characteristic index, oxygen temperature is calculated, and the oxygen flow is transmitted
Give oxygen supply execution module；Oxygen temperature calculate can binding model and database optimizing, obtain optimal oxygen temperature；
Supplying oxygen execution module includes obtained oxygen flow and oxygen temperature numerical value in operation interface, by operating personnel
After confirming execute instruction, oxygen supply execution module controls corresponding valve group and heating element heater via fieldbus and PLC, to oxygen flow
Execution is controlled with oxygen temperature；In production process, control system is corrected in real time according to the data that measuring instrument is fed back
Control parameter.
The present invention is applied to 30-200 ton steel-making course of the electric arc furnace, oxygen flow 100-4000Nm3/ h, oxygen temperature are
25-500 DEG C, oxygen stagnation pressure is 0.1-1.5MPa, and oxygen is blown into by the pre-heated oxygen rifle in furnace wall and the pre-heated oxygen rifle of fire door
In electric arc furnaces, reach rapid melting steel scrap, making foamed slag, dephosphorization decarburization and the purpose of heating.
Beneficial effects of the present invention are：Compared with traditional approach, oxygen jet has more excellent jet characteristics, oxygen profit
2%~5% is improved with rate, decarbonization rate is accelerated, and decarburization time shortens more than 1min, and finishing slag TFe reduces by more than 2%, iron and steel stock
Consumption reduces more than 5kg/t, has significant effect of optimization and economic benefit, has a extensive future.
Brief description of the drawings
Fig. 1 show the steel-making control system architecture schematic diagram that electric arc furnaces of the embodiment of the present invention uses pre-heated oxygen rifle.
Fig. 2 show the steel-making control method control logic figure that electric arc furnaces of the embodiment of the present invention uses pre-heated oxygen rifle.
Wherein：1- oxygen sources, 2- oxygen flux controls valve group, 3- temperature control systems, 4- electric arc furnace bodies, 5- furnace walls
Pre-heated oxygen rifle, the pre-heated oxygen gun sprayer in 6- furnace walls, 71- working of a furnaces judge module, 72- requirement analysis modules, 73- temperature computation moulds
Block, 74- flow rate calculations module, 75- oxygen supply execution modules.
Embodiment
The specific embodiment of the invention is described in detail below in conjunction with specific accompanying drawing.It should be noted that in following embodiments
The combination of the technical characteristic or technical characteristic of description is not construed as isolated, and they can be mutually combined so as to reach
To superior technique effect.In the accompanying drawing of following embodiments, identical label that each accompanying drawing occurs represent identical feature or
Person's part, it can be applied in different embodiments.
A kind of electric arc furnaces of the embodiment of the present invention uses the steelmaking process control method of pre-heated oxygen rifle, including：By electric arc furnaces
Smelting process is decomposed into the step of multiple smelting stages, the step of judging the residing smelting stage in arc furnace smelting procedure, and
Oxygen flow and oxygen temperature are adjusted at times in each smelting stage, realize that oxygen jet oxidability and impact are stirred
The step of mixing ability independent control.
Preferably, the adjustable range of oxygen flow is 100-4000Nm3/ h, oxygen temperature adjustable range are 25-500 DEG C.
Preferably, the multiple smelting stage includes：Oxygen blast fluxing stage, making foamed slag dephosphorization stage, quick decarburization rank
Section, blowing latter stage.
Preferably, the scope of the fluxing stage oxygen flow of oxygen blast is 500-2000Nm3/h；The oxygen in making foamed slag dephosphorization stage
The scope of throughput is 1000-3000Nm3/ h, the scope of the oxygen flow of quick decarburizing phase is 2000-4000Nm3/ h, blowing
The scope of the oxygen flow in latter stage is 1500-3000Nm3/h。
Preferably, the scope of the fluxing stage oxygen temperature of oxygen blast is 200-500 DEG C；The oxygen temperature in making foamed slag dephosphorization stage
The scope of degree is 25-300 DEG C, and the scope of the oxygen temperature of quick decarburizing phase is 100-300 DEG C, the oxygen temperature in latter stage of blowing
Scope be 300-500 DEG C.
As shown in Figure 1, it is preferred that the steelmaking process control method is completed by control system, the control system bag
Include：Working of a furnace judge module 71, requirement analysis module 72, flow rate calculation module 74, temperature computation module 73, oxygen supply execution module
75；Working of a furnace judge module 71 is connect before requirement analysis module 72, is followed by flow rate calculation module 74 and temperature computation module 73, the stream
Amount computing module 74 and temperature computation module 73 are followed by supplying oxygen execution module 74.
Preferably, above-mentioned steelmaking process control method specifically includes following steps：
Step 1: judge to smelt the residing stage；Since the first batch of material adds electric arc furnaces, working of a furnace judge module 71 is real-time
Judge to smelt the residing stage：Oxygen blast fluxing stage, making foamed slag dephosphorization stage, quick decarburizing phase or blowing latter stage；When sentencing
When disconnected steelmaking process will enter next stage, by phase characteristic information transfer to requirement analysis module 72；The phase characteristic letter
Breath includes：Burden structure, the duration of heat, oxygen-supplying amount, bath temperature, electrode input power, the image of high temperature imaging device feedback
Information；
Step 2: calculate oxygen supply demand characteristic index；Requirement analysis module 72 is according to the phase characteristic information collected, meter
Calculate oxygen supply demand characteristic index I：
I=IO×10+II；
Wherein：IO、IIRespectively oxidisability demand index and impact demand index；Oxygen blast fluxing stage, IOFor 2-5, II
For 4-5；Making foamed slag dephosphorization stage, IOFor 5-6, IIFor 4-5；Quick decarburizing phase, IOFor 7-9, IIFor 7-8；Blow latter stage, IO
For 5-7, IIFor 8-9；
Step 3: calculate oxygen flow；Oxidisability demand index I in the obtaining step two of flow rate calculation module 74O, according to
Formula Q=IO/8×Q0Oxygen flow Q, wherein Q is calculated0For the design discharge of pre-heated oxygen rifle, the oxygen that will be calculated
Flow number is transferred to oxygen supply execution module 75；
Step 4: calculate oxygen temperature；Oxidisability demand index I in the obtaining step two of temperature computation module 73OAnd punching
Hitting property demand index IIAfterwards, according to formulaOxygen temperature is calculated, whereinIt is for amendment with ω
Number, T0For the design maximum temperature of pre-heated oxygen rifle；The oxygen temperature being calculated is transferred to oxygen supply execution module 75；
Step 5: oxygen flow and oxygen temperature are adjusted to calculated value；Supplying oxygen execution module 75 will be Step 3: in step 4
Obtained oxygen flow and oxygen temperature numerical value is shown in operation interface, and after confirming execute instruction by operating personnel, oxygen supply is held
Row module 75 controls corresponding valve group and heating element heater via fieldbus and PLC, and oxygen flow and oxygen temperature are controlled
Perform；In production process, the real-time Correction and Control parameter of data that control system is fed back according to measuring instrument.
Specific execution logic is as shown in Figure 2.
Present invention also offers the steelmaking process control system that a kind of electric arc furnaces uses pre-heated oxygen rifle, including：The working of a furnace is sentenced
Disconnected module 71, requirement analysis module 72, flow rate calculation module 74, temperature computation module 73, oxygen supply execution module 75；Demand analysis
Working of a furnace judge module 71 is connect before module 72, is followed by flow rate calculation module 74 and temperature computation module 73, the flow rate calculation module
74 and temperature computation module 73 be followed by supply oxygen execution module 75；
Preferably, the real-time judge of working of a furnace judge module 71 smelts the residing stage, when judging that it is next that steelmaking process will enter
During the stage, by phase characteristic information transfer to requirement analysis module 72；
Requirement analysis module 72 calculates oxygen supply demand characteristic index according to the phase characteristic information collected；
After flow rate calculation module 74 obtains oxygen supply characteristic index, oxygen flow is calculated, and the oxygen flow is passed
It is defeated by oxygen supply execution module 75；
After temperature computation module 73 obtains oxygen supply characteristic index, oxygen temperature is calculated, and the oxygen flow is passed
It is defeated by oxygen supply execution module 75；
Supplying oxygen execution module 75 includes obtained oxygen flow and oxygen temperature numerical value in operation interface, by operator
After member confirms execute instruction, oxygen supply execution module 75 controls corresponding valve group and heating element heater via fieldbus and PLC, to oxygen
Flow and oxygen temperature are controlled execution；In production process, control system is real-time according to the data that measuring instrument is fed back
Correction and Control parameter.
Embodiment 1
As shown in figure 1, the present embodiment is the application on 100 tons of ultra high power EBT electric arc furnaces, oxygen is from oxygen source 1
Rise, through oxygen flux control valve group 2, then through temperature control system 3, entered by electric arc furnace body 4 in electric arc furnaces, the electric arc furnaces
Possess the pre-heated oxygen rifle 5 in furnace wall totally 4, the pre-heated oxygen rifle of fire door 1, the oxygen heating mode of temperature control system 3 uses cigarette
Gas heat exchange+electrically heated mode, the pre-heated oxygen gun sprayer 6 in furnace wall design Mach 2 ship 2.0, design discharge 2000Nm3/ h, oxygen
Gas stagnation pressure 0.814MPa.
Oxygen flow and temperature use computer time-division transfer technology, and Oxygen control system is included in control system of the electric arc furnace
System, oxygen control system is by working of a furnace judge module 71, requirement analysis module 72, flow rate calculation module 74, temperature computation module 73
Formed with oxygen supply execution module 75.Whole smelting process is divided into oxygen blast fluxing stage, making foamed slag by working of a furnace judge module 71
Stage, decarburizing phase and blowing latter stage, the timing since electric arc furnaces adds the first batch of material, and charge data, oxygen supply are gathered in real time
Amount, bath temperature etc., when working of a furnace judge module concludes that smelting will enter the new stage, phase characteristic information transfer is given immediately
Requirement analysis module 72；Requirement analysis module 72 is strong according to the stirring intensity needed for the phase characteristic information analysis new stage and oxygen supply
Degree, the oxygen supply demand characteristic index of new stage is calculated, and by its simultaneous transmission to flow rate calculation module 74 and temperature computation mould
Block 73；Flow rate calculation module 74 and temperature computation module 73 calculate optimal oxygen stream respectively according to oxygen supply demand characteristic index
Amount and oxygen temperature, result of calculation are shown in operation interface, decide whether to perform by operating personnel；Personnel to be operated, which assign, to hold
After row instruction, oxygen supply execution module 75 controls corresponding valve group and heating element heater via fieldbus and PLC, to oxygen flow and oxygen
Temperature degree is controlled execution.In production process, the real-time Correction and Control of data that control system is fed back according to measuring instrument
Parameter, it is finally reached optimum control.
It is the 43.8% cold DRI of+25% heating molten steel of the cold pig iron of steel scrap+12.5%+18.7% in burden structure, should
Each stage injection parameter and metallurgical effect when electric arc furnaces uses of the invention is as follows：
The oxygen blast fluxing stage：Oxygen flow is 1250Nm3/ h, oxygen temperature are 490 DEG C, and the scrap melting time shortens 1 point
It is more than clock；
Making foamed slag, dephosphorization stage：Oxygen flow is 1500Nm3/ h, oxygen temperature are 25 DEG C, are advantageous to quickly make and steep
Foam slag, improve dephosphorization efficiency.
Quick decarburizing phase：In carbon period, oxygen supply turns into the restricted link of decarbonization rate, now with maximum stream flow
Oxygen is supplied to molten bath, i.e. oxygen flow is 2000Nm3/ h, oxygen temperature are properly increased to 100 DEG C, are strengthened melting bath stirring, are carried
High decarbonization rate.
Blow latter stage：Oxygen flow is 1500Nm3/ h, oxygen temperature are 500 DEG C, are strengthened while oxygen flow is reduced
Melting bath stirring, finishing slag (FeO) is advantageously reduced, reduce iron loss and steel technology.
After the control method, electric arc furnace smelting efficiency significantly improves, and the scrap melting time shortens more than 1 minute,
Foamed slag can be quickly formed, dephosphorization and decarbonization rate are obviously improved, and smelting cycle shortens more than 3 minutes, and steel technology subtracts
Few more than 5kg/t, has significant effect of optimization and economic benefit.
Embodiment 2
The present embodiment is the application on 150 tons of ultra high power EBT electric arc furnaces, oxygen from oxygen source 1,
Through oxygen flux control valve group 2, then through temperature control system 3, entered by electric arc furnace body 4 in electric arc furnaces, be somebody's turn to do
Electric arc furnaces possesses the pre-heated oxygen rifle 5 in furnace wall totally 5, the pre-heated oxygen rifle of fire door 1, and oxygen heating mode uses electrically heated side
Formula, oxygen gun sprayer design Mach 2 ship 2.0, design discharge 3000Nm3/ h, oxygen stagnation pressure 0.814MPa.
Oxygen flow and temperature use computer time-division transfer technology, and Oxygen control system is included in control system of the electric arc furnace
System, oxygen control system is by working of a furnace judge module 71, requirement analysis module 72, flow rate calculation module 74, temperature computation module 73
Formed with oxygen supply execution module 75.Whole smelting process is divided into oxygen blast fluxing stage, making foamed slag by working of a furnace judge module 71
Stage, decarburizing phase and blowing latter stage, the timing since electric arc furnaces adds the first batch of material, and charge data, oxygen supply are gathered in real time
Amount, bath temperature etc., when working of a furnace judge module concludes that smelting will enter the new stage, phase characteristic information transfer is given immediately
Requirement analysis module 72；Requirement analysis module 72 is strong according to the stirring intensity needed for the phase characteristic information analysis new stage and oxygen supply
Degree, the oxygen supply demand characteristic index of new stage is calculated, and by its simultaneous transmission to flow rate calculation module 74 and temperature computation mould
Block 73；Flow rate calculation module 74 and temperature computation module 73 calculate optimal oxygen stream respectively according to oxygen supply demand characteristic index
Amount and oxygen temperature, result of calculation are shown in operation interface, decide whether to perform by operating personnel；Personnel to be operated, which assign, to hold
After row instruction, oxygen supply execution module 75 controls corresponding valve group and heating element heater via fieldbus and PLC, to oxygen flow and oxygen
Temperature degree is controlled execution.In production process, the real-time Correction and Control of data that control system is fed back according to measuring instrument
Parameter, it is finally reached optimum control.
It is the 45.3% cold DRI of+30% heating molten steel of the cold pig iron of steel scrap+9.7%+15% in burden structure, the electric arc
Each stage injection parameter and metallurgical effect when stove uses of the invention is as follows：
The oxygen blast fluxing stage：Oxygen flow is 1500Nm3/ h, oxygen temperature are 490 DEG C, and the scrap melting time shortens 1 point
It is more than clock.
Making foamed slag, dephosphorization stage：Oxygen flow is 2250Nm3/ h, oxygen temperature are 100 DEG C, are advantageous to quickly make
Foamed slag, improve dephosphorization efficiency.
Quick decarburizing phase：In carbon period, oxygen supply turns into the restricted link of decarbonization rate, now with maximum stream flow
Oxygen is supplied to molten bath, i.e. oxygen flow is 3000Nm3/ h, oxygen temperature are properly increased to 300 DEG C, are strengthened melting bath stirring, are carried
High decarbonization rate.
Blow latter stage：Oxygen flow is 2500Nm3/ h, oxygen temperature are 500 DEG C, are strengthened while oxygen flow is reduced
Melting bath stirring, finishing slag (FeO) is advantageously reduced, reduce iron loss and steel technology.
After the control method, electric arc furnace smelting efficiency significantly improves, the scrap melting time shorten 1.5 minutes with
On, foamed slag can be quickly formed, dephosphorization and decarbonization rate are obviously improved, and smelting cycle shortens more than 4 minutes, steel technology
More than 6kg/t is reduced, there is significant effect of optimization and economic benefit.
Beneficial effects of the present invention are：Compared with traditional approach, oxygen jet has more excellent jet characteristics, oxygen profit
2%~5% is improved with rate, decarbonization rate is accelerated, and decarburization time shortens more than 1min, and finishing slag TFe reduces by more than 2%, iron and steel stock
Consumption reduces more than 5kg/t, has significant effect of optimization and economic benefit, has a extensive future.
Although having been presented for several embodiments of the present invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment be it is exemplary, no
Restriction that should be using the embodiments herein as interest field of the present invention.
Claims (5)
1. a kind of electric arc furnaces uses the steelmaking process control method of pre-heated oxygen rifle, it is characterised in that including：By electric arc furnace smelting
The step of procedure decomposition is multiple smelting stages, the step of judging the residing smelting stage in arc furnace smelting procedure, and every
Oxygen flow and oxygen temperature are adjusted at times in the individual smelting stage, realize oxygen jet oxidability and impact stirring power
The step of power independent control；
Specifically include following steps：
Step 1: judge to smelt the residing stage；Since the first batch of material adds electric arc furnaces, working of a furnace judge module real-time judge smelting
The refining residing stage：Oxygen blast fluxing stage, making foamed slag dephosphorization stage, quick decarburizing phase or blowing latter stage；When judgement is made steel
When process will enter next stage, by phase characteristic information transfer to requirement analysis module；The phase characteristic information includes：Stove
Expect structure, the duration of heat, oxygen-supplying amount, bath temperature, electrode input power, the image information of high temperature imaging device feedback；
Step 2: calculate oxygen supply demand characteristic index；Requirement analysis module calculates confession according to the phase characteristic information collected
Oxygen demand characteristic index I：
I=IO×10+II；
Wherein：IO、IIRespectively oxidisability demand index and impact demand index；Oxygen blast fluxing stage, IOFor 2-5, IIFor 4-
5；Making foamed slag dephosphorization stage, IOFor 5-6, IIFor 4-5；Quick decarburizing phase, IOFor 7-9, IIFor 7-8；Blow latter stage, IOFor 5-
7, IIFor 8-9；
Step 3: calculate oxygen flow；Oxidisability demand index I in flow rate calculation module obtaining step twoO, according to formula Q=
IO/8×Q0Oxygen flow Q, wherein Q is calculated0For the design discharge of pre-heated oxygen rifle, the oxygen flow number that will be calculated
Value is transferred to oxygen supply execution module；
Step 4: calculate oxygen temperature；Oxidisability demand index I in temperature computation module obtaining step twoOWith impact demand
Index IIAfterwards, according to formulaOxygen temperature is calculated, whereinIt is correction factor with ω, T0For
The design maximum temperature of pre-heated oxygen rifle；The oxygen temperature being calculated is transferred to oxygen supply execution module；
Step 5: oxygen flow and oxygen temperature are adjusted to calculated value；Oxygen supply execution module is by Step 3: obtain in step 4
Oxygen flow and oxygen temperature numerical value are shown in operation interface, after confirming execute instruction by operating personnel, supply oxygen execution module
Corresponding valve group and heating element heater are controlled via fieldbus and PLC, execution is controlled to oxygen flow and oxygen temperature；Production
During, the real-time Correction and Control parameter of data that control system is fed back according to measuring instrument.
2. electric arc furnaces as claimed in claim 1 uses the steelmaking process control method of pre-heated oxygen rifle, it is characterised in that oxygen
The adjustable range of flow is 100-4000Nm3/ h, oxygen temperature adjustable range are 25-500 DEG C.
3. electric arc furnaces as claimed in claim 1 uses the steelmaking process control method of pre-heated oxygen rifle, it is characterised in that oxygen blast
The scope of fluxing stage oxygen flow is 500-2000Nm3/h；The scope of the oxygen flow in making foamed slag dephosphorization stage is 1000-
3000Nm3/ h, the scope of the oxygen flow of quick decarburizing phase is 2000-4000Nm3/ h, the model of the oxygen flow in latter stage of blowing
Enclose for 1500-3000Nm3/h。
4. electric arc furnaces as claimed in claim 1 uses the steelmaking process control method of pre-heated oxygen rifle, it is characterised in that oxygen blast
The scope of fluxing stage oxygen temperature is 200-500 DEG C；The scope of the oxygen temperature in making foamed slag dephosphorization stage is 25-300 DEG C,
The scope of the oxygen temperature of quick decarburizing phase is 100-300 DEG C, and the scope of the oxygen temperature in latter stage of blowing is 300-500 DEG C.
5. electric arc furnaces as claimed in claim 1 uses the steelmaking process control method of pre-heated oxygen rifle, it is characterised in that described
Steelmaking process control method is completed by control system, and the control system includes：Working of a furnace judge module, requirement analysis module,
Flow rate calculation module, temperature computation module, oxygen supply execution module；Working of a furnace judge module is connect before requirement analysis module, is followed by flow
Computing module and temperature computation module, flow rate calculation module and the temperature computation module of being followed by are followed by supplying oxygen execution module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110736581A (en) * | 2019-09-17 | 2020-01-31 | 北京科技大学 | method and system for measuring pressure loss of converter oxygen lance pipeline |
| CN112322831B (en) * | 2020-11-10 | 2021-06-22 | 中南大学 | Slag heat recovery preheating type oxygen lance for electric arc furnace steelmaking and application method thereof |
| CN115679034B (en) * | 2022-09-09 | 2024-02-02 | 天津喆丰环保科技有限公司 | Oxygen blowing control method of electric arc furnace based on molten steel liquid level position |
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