CN208517458U - A kind of LF furnace dynamic bottom blowing CO2- Ar purifier system - Google Patents
A kind of LF furnace dynamic bottom blowing CO2- Ar purifier system Download PDFInfo
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- CN208517458U CN208517458U CN201820860052.XU CN201820860052U CN208517458U CN 208517458 U CN208517458 U CN 208517458U CN 201820860052 U CN201820860052 U CN 201820860052U CN 208517458 U CN208517458 U CN 208517458U
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Abstract
The utility model belongs to steelmaking technical field, in particular to a kind of LF furnace dynamic bottom blowing CO2- Ar purifier system is suitable for 30-300t LF furnace refining process.Using CO2Medium and furnace protection gas are blown as LF furnace bottom with Ar; enter the station molten steel component data and refining process composition of fumes data are refined in conjunction with LF furnace; refining process molten steel component is predicted based on Ar tracer conservation, and CO is dynamically adjusted according to refining target molten steel component parameter request at times2With the bottom blowing flow of Ar and the blowing flow of furnace protection gas, strengthening melting bath stirring in ladle, while realizing fast and deep desulfurization, is further decreasing nitrogen content in molten steel, improve quality of molten steel；CO is utilized simultaneously2Refining operation is completed instead of part Ar, reduces Ar consumption, reduces production cost.
Description
Technical field
The utility model belongs to steelmaking technical field, in particular to a kind of LF furnace dynamic bottom blowing CO2- Ar purifier system
System.
Background technique
LF furnace (Ladle Furnace ladle refining furnace) refining is the main technique of pneumatic steelmaking and Electric Arc Furnace Steelmaking Flow
Link has heating, desulfurization, adjustment molten steel component, improves the metallurgical functions such as molten steel cleanness, and smelting process, which relies primarily on, to be made
White slag carries out desulfurization smelting, while carrying out melting bath stirring using bottom blowing Ar, improves desulphurization kinetics condition between slag-steel,
Even molten bath ingredient and temperature.And bottom blowing Ar is also beneficial to the formation of foamed slag, improves electric arc heat transfer efficiency.Traditional LF furnace refines
Improvement liquid steel desulphurization, it is general that bottom blowing stirring is strengthened using the method for increasing bottom blowing Ar flow, improve melt tank reaction dynamics item
Part.However, the method can cause a series of problems: 1) bottom blowing Ar forms air pocket stream stock in molten bath, after bottom blowing intensity increase,
Ar stream stock makes molten steel liquid level larger fluctuation occur, easily molten steel is caused to be in direct contact with the electrode；2) bottom blowing Ar flow increases, practical
Occurs the phenomenon that top of the slag is blown open in ladle in production, molten steel face is contacted with furnace atmosphere, causes the secondary oxidation of molten steel；
3) since high-temperature electric arc ionized air causes molten steel easily to inhale nitrogen, bottom blowing flow increases, after slag blanket is blown open, absorption of nitrogen by steel process meeting
It is further exacerbated by, influences product quality.Therefore, traditional LF furnace refining limits the flow of bottom blowing Ar, refining process melting bath stirring
Intensity is difficult further to strengthen, and the transmission speed of substance and heat is slow in ladle, and desulfuration efficiency is difficult to improve, and causes refining time
It is long, high production cost；And LF furnace bottom is blown often will appear molten steel nitrogen pick-up phenomenon in Ar refining process, is lacked in effectively removing molten steel
The smelting means of nitrogen.Therefore, how to strengthen LF furnace refining process stirring intensity of molten pool, improve substance and heat transfer speed in LF furnace
Degree realizes fast and deep desulfurization, while realizing LF furnace refining and denitridating, improves quality of molten steel, is to speed up LF furnace refining rhythm, reduces life
Produce the key of cost.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of short block high-impermeable liner structures of radial coenosarc
In order to solve the above technical problems, the embodiments of the present invention provide one kind
In view of the above-mentioned problems, the utility model proposes a kind of LF furnace dynamic bottom blowing CO2- Ar purifier and method solve
Existing LF furnace refining process bottom blowing Ar intensity is limited, fast and deep desulfurization is difficult, molten steel easily inhales the technical problems such as nitrogen.It is refined in LF furnace
In the process, using CO2Blow medium and furnace protection gas as LF furnace bottom with Ar, in conjunction with LF furnace refining enter the station molten steel component data and
Refining process composition of fumes data predict refining process molten steel component based on Ar tracer conservation, and according to refining target
Molten steel component parameter request dynamically adjusts CO at times2With the bottom blowing flow of Ar and the blowing flow of furnace protection gas, strengthening
Melting bath stirring in ladle while realizing fast and deep desulfurization, further decreases nitrogen content in molten steel, improves quality of molten steel；Simultaneously
Utilize CO2Refining operation is completed instead of part Ar, Ar consumption is reduced, reduces production cost.
A kind of LF furnace dynamic bottom blowing CO2- Ar purifier system, including LF furnace, control system, Bottom Blowing control valve group,
Furnace protection gas control valve group, fire door micro-pressure-difference detection system, analysis of fumes system, furnace gas sampler, Ar air supply system, CO2
Air supply system.The micro-differential pressure system is mounted on LF furnace bell and ladle furnace junction, passes through signal transmission wire and control
System connection processed；The furnace gas sampler is connect by gas pipeline with analysis of fumes system；The analysis of fumes system passes through
Signal transmission wire is connect with control system；The Ar air supply system and CO2Air supply system passes through gas pipeline and bottom blowing gas control
Valve group connection processed, Ar pipeline and CO2Pipeline passes through flow valve respectively and pressure valve individually controls, and summarizes after two-way is in parallel；It is described
Bottom blowing control valve group is connect by gas pipeline with the bottom blowing nozzle of LF furnace, by CO2- Ar gaseous mixture inputs LF by bottom blowing nozzle
Furnace molten bath；The CO2Air supply system is connect by gas pipeline with furnace protection gas control valve group, furnace protection gas control valve group
It is connect by gas pipeline with the bell of LF furnace；The control system by signal transmission wire respectively with Bottom Blowing control valve group
It connects with furnace protection gas control valve group, is acted by control Bottom Blowing control valve group and furnace protection gas control valve group, realized
LF refining process CO2It is blown with the dynamic at times of Ar.
The control system includes initial molten steel compositional data acquisition module, bottom blowing flow data collector module, burner hearth guarantor
Protect throughput data acquisition module and molten steel component prediction module；The fire door micro-pressure-difference detection system real-time detection fire door minute-pressure
Difference data, and fire door minute-pressure difference data is delivered to control system, control system controls burner hearth according to fire door minute-pressure difference data and protects
Protect the movement of gas control valve group, online regulation furnace protection throughput, to guarantee refining process burner hearth micro-positive pressure.The molten steel component
Data acquisition module, which obtains the refining of LF furnace and enters the station, molten steel component data and to be stored, and molten steel component data can be carried out by two ways
Obtain: 1) LF furnace enter the station sampling steel components tests obtain data；2) according to converter or electric arc furnace smelting terminal molten steel component and
Tapping process is added alloy material in ladle etc. and carries out MaterialBalance Computation acquisition.The analysis of fumes system is in refining process pair
Composition of fumes carries out on-line analysis and obtains furnace gas transient member data.
The present invention is suitable for 30-300t LF furnace refining process, and the burner hearth micro-positive pressure is 10~30Pa.Through the invention
Melting bath stirring in LF furnace refining process ladle can be strengthened, while realizing fast and deep desulfurization, further decrease nitrogen content in molten steel,
Improve quality of molten steel, while reducing Ar consumption, reduces production cost.So that LF furnace refining cycle shortens 3-6min, desulfurization degree
Reach 90% or more, nitrogen content in liquid steel reduces 10-30 × 10-6, product quality is improved, production cost is reduced, improves life
Produce efficiency.
Detailed description of the invention
Fig. 1 is the utility model LF furnace dynamic bottom blowing CO2- Ar purifier system connection figure.
1, control system in Fig. 1,2, analysis of fumes system, 3, micro-differential pressure detection system, 4, Bottom Blowing control valve group,
5, Ar gas source, 6, CO2Gas source, 7, furnace protection air valve group, 8, LF furnace, 9, furnace gas sampler.
Specific embodiment
A kind of LF furnace dynamic bottom blowing CO2- Ar purifier system, including LF furnace, control system, Bottom Blowing control valve group,
Furnace protection gas control valve group, fire door micro-pressure-difference detection system, analysis of fumes system, furnace gas sampler, Ar air supply system, CO2
Air supply system.The micro-differential pressure system is mounted on LF furnace bell and ladle furnace junction, passes through signal transmission wire and control
System connection processed；The furnace gas sampler is connect by gas pipeline with analysis of fumes system；The analysis of fumes system passes through
Signal transmission wire is connect with control system；The Ar air supply system and CO2Air supply system passes through gas pipeline and bottom blowing gas control
Valve group connection processed, Ar pipeline and CO2Pipeline passes through flow valve respectively and pressure valve individually controls, and summarizes after two-way is in parallel；It is described
Bottom blowing control valve group is connect by gas pipeline with the bottom blowing nozzle of LF furnace, by CO2- Ar gaseous mixture inputs LF by bottom blowing nozzle
Furnace molten bath；The CO2Air supply system is connect by gas pipeline with furnace protection gas control valve group, furnace protection gas control valve group
It is connect by gas pipeline with the bell of LF furnace；The control system by signal transmission wire respectively with Bottom Blowing control valve group
It connects with furnace protection gas control valve group, is acted by control Bottom Blowing control valve group and furnace protection gas control valve group, realized
LF refining process CO2It is blown with the dynamic at times of Ar.
The utility model specific implementation step are as follows:
Step 1: molten steel component data acquisition module obtain just furnace (converter or electric arc furnaces) tapping molten steel component data and
Tapping to LF furnace enters the station, and smelting quality of materials and compositional data are added in a ladle, based on conservation of matter calculating LF furnace refine into
Molten steel component data of standing simultaneously are sent to control system.
Step 2: slugging stage early period: control system controls furnace protection gas control valve group according to fire door minute-pressure difference data and moves
Make, online regulation furnace protection throughput 0-50Nm3/ h, to guarantee refining process burner hearth micro-positive pressure.Control system is according to LF furnace
Molten steel carbon content [%C] is entered the station in refining0Dynamic adjustment slugging early period stage CO2With the bottom blowing process parameter of Ar, concrete scheme is such as
Under:
1) as [%C]0When >=0.40, Bottom Blowing initial flow is 10-20NL/ (mint), CO in Bottom Blowing2Volume flow
Amount ratio is 80-99%.
2) as 0.25≤[%C]0When < 0.40, Bottom Blowing initial flow is 10-20NL/ (mint), CO in Bottom Blowing2Body
Product flow proportional is 60-80%.
3) as [%C]0When < 0.25, Bottom Blowing initial flow is 10-20NL/ (mint), CO in Bottom Blowing2Volume flow
Ratio is 40-60%.
Step 3: mid-term desulfurization stage: control system controls furnace protection gas control valve group according to fire door minute-pressure difference data and moves
Make, online regulation furnace protection throughput 0-50Nm3/ h, to guarantee refining process burner hearth micro-positive pressure；Control system is based on furnace gas
Analysis data analysis of fumes data consider electrode carburetting simultaneously, and LF furnace refining process is calculated according to molten steel component prediction module
Molten steel carbon content [%C]t, dynamic adjustment mid-term desulfurization stage CO2With the bottom blowing process parameter of Ar, concrete scheme is as follows:
1) as [%C]tWhen >=0.40, Bottom Blowing initial flow is 5-15NL/ (mint), CO in Bottom Blowing2Volume flow
Ratio is 80-99%.
2) as 0.25≤[%C]tWhen < 0.40, Bottom Blowing initial flow is 5-15NL/ (mint), CO in Bottom Blowing2Body
Product flow proportional is 60-80%.
3) as [%C]tWhen < 0.25, Bottom Blowing initial flow is 5-15NL/ (mint), CO in Bottom Blowing2Volume flow
Ratio is 40-60%.
Step 4: later period soft blowing phase: system processed controls furnace protection gas control valve group according to fire door minute-pressure difference data and moves
Make, online regulation furnace protection throughput 0-100Nm3/ h, to guarantee refining process burner hearth micro-positive pressure；Bottom Blowing is CO2It is mixed with Ar
Close gas, CO in air blowing2Volume flow proportion is 0-30%, and bottom blowing flow is 0.5-5NL/mint, until refining terminates.
Step 5: control system was refined according to LF furnace refining process analysis of fumes data and the calculating of each Gas injection data
Journey molten steel denitrogenation amount.
Claims (1)
1. a kind of LF furnace dynamic bottom blowing CO2- Ar purifier system, it is characterised in that: institute includes LF furnace, control system using equipment
System, Bottom Blowing control valve group, furnace protection gas control valve group, fire door micro-pressure-difference detection system, analysis of fumes system, furnace gas sampling
Device, Ar air supply system, CO2Air supply system；The micro-differential pressure system is mounted on LF furnace bell and ladle furnace junction, passes through
Signal transmission wire is connect with control system；The furnace gas sampler is connect by gas pipeline with analysis of fumes system；It is described
Analysis of fumes system is connect by signal transmission wire with control system；The Ar air supply system and CO2Air supply system passes through defeated
Feed channel is connect with Bottom Blowing control valve group, Ar pipeline and CO2Pipeline passes through flow valve respectively and pressure valve individually controls, two-way
Summarize after parallel connection；The bottom blowing control valve group is connect by gas pipeline with the bottom blowing nozzle of LF furnace, by CO2- Ar gaseous mixture is logical
Cross bottom blowing nozzle input LF furnace molten bath；The CO2Air supply system is connect by gas pipeline with furnace protection gas control valve group, furnace
Thorax protection gas control valve group is connect by gas pipeline with the bell of LF furnace；The control system is distinguished by signal transmission wire
It is connect with Bottom Blowing control valve group and furnace protection gas control valve group, passes through control Bottom Blowing control valve group and furnace protection gas control
Valve group movement processed, realizes LF refining process CO2It is blown with the dynamic at times of Ar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820860052.XU CN208517458U (en) | 2018-06-04 | 2018-06-04 | A kind of LF furnace dynamic bottom blowing CO2- Ar purifier system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820860052.XU CN208517458U (en) | 2018-06-04 | 2018-06-04 | A kind of LF furnace dynamic bottom blowing CO2- Ar purifier system |
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| CN208517458U true CN208517458U (en) | 2019-02-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113512626A (en) * | 2021-04-23 | 2021-10-19 | 东北大学 | Ladle multipoint pulsation type bottom blowing intelligent refining device and method |
| CN114622062A (en) * | 2022-02-07 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Method for reducing use cost of ladle bottom blowing medium in LF refining furnace |
-
2018
- 2018-06-04 CN CN201820860052.XU patent/CN208517458U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113512626A (en) * | 2021-04-23 | 2021-10-19 | 东北大学 | Ladle multipoint pulsation type bottom blowing intelligent refining device and method |
| CN114622062A (en) * | 2022-02-07 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Method for reducing use cost of ladle bottom blowing medium in LF refining furnace |
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