CN107983943A - A kind of system and method for improving tundish Cleanliness of Molten Steel under unstable state state - Google Patents
A kind of system and method for improving tundish Cleanliness of Molten Steel under unstable state state Download PDFInfo
- Publication number
- CN107983943A CN107983943A CN201711282843.5A CN201711282843A CN107983943A CN 107983943 A CN107983943 A CN 107983943A CN 201711282843 A CN201711282843 A CN 201711282843A CN 107983943 A CN107983943 A CN 107983943A
- Authority
- CN
- China
- Prior art keywords
- molten steel
- tundish
- long nozzle
- argon
- cleanliness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a kind of system and method for improving tundish Cleanliness of Molten Steel under unstable state state, belong to technical field of ferrous metallurgy.Long nozzle of the present invention is characterized in that changing middle part shape, Zhu Liu areas are formed among long nozzle, one circle argon blowing hole is set in Zhu Liu areas at the same time, the long nozzle of the present invention can be achieved at the same time molten steel sealing and prevent from inhaling nitrogen and Argon stirring degassing, realizing sealing function effectively prevents molten steel air-breathing, also come into full contact with using molten steel diffusing caused by the mutation of long nozzle caliber with argon gas, to reach gas purpose in removing steel；Molten steel liquid level measurement instrument is used for the liquid level position for measuring molten steel, flow control Pan Kou is used for the flowing for controlling molten steel, spill stopper is used for the generation for controlling confluence whirlpool, automatic hoisting mechanism be used to controlling spill stopper position can effectively anti-backflow whirlpool formation, improve the cleanliness factor of molten steel.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, and tundish is improved in unstable state state more specifically to one kind
The system and method for lower Cleanliness of Molten Steel.
Background technology
In casting process, centre is surrounded by open and pours, changes the transients such as ladle is front and rear, casting terminates.Transient
When tundish in liquid level fluctuation of molten steel is larger, pulling rate change is frequent and different steel grades mix the casting state such as pour.Due to this state
Liquid steel temperature change, secondary oxidation and turbulent flow slag are compared serious during stable state, thus have significant impact to slab quality.Have
Research shows that T [O] substantially rises apparently higher than cast, field trash size and number is stablized in molten steel under unsteady state condition, from
And slab quality is generally reduced, due to significantly affecting the cleanliness factor of molten steel, reinforcement pair in continuous casting transient
The control of unsteady statecalculation is one of key point for improving Cleanliness of Molten Steel.Analysis shows are during unsteady statecalculation：Open and pour, change
Ladle and casting terminate, and due to reasons such as secondary oxidation slags, the cleanliness factor index of molten steel is deteriorated seriously.
Slag, the generation of slag decline mainly due to pouring basket liquid level and are produced at submersed nozzle in transient casting
Caused by raw confluence whirlpool.Conflux vortex is during container drainage, and when liquid level, to drop to certain altitude (commonly referred to as critical
Height or vortex height) when occur.For STEELMAKING PRODUCTION, this conflux vortex slag harm is：(1) converge whirlpool
Occur when liquid level is higher, reaching critical altitude will occur；(2) slag is in swirl center, it is difficult to differentiates；(3) it can be strong
Slag steel is promoted to emulsify strongly.Current metallargist is prevented to be concentrated mainly on minimum cast for slag in unstable state, slag
The research of liquid level, and it is less to control the mouth of a river to produce confluence whirlpool research for being improved at middle water containing opening.
On the other hand, with social economy and the development of science and technology, the performance requirement of steel is increasingly improved.It is how effectively anti-
Only and at utmost removal of inclusions is the Main way studied at present to improve Cleanliness of Molten Steel.Can be in terms of two to strand
Cleanliness factor be controlled, be on the one hand the field trash removed by various modes as far as possible in molten steel, be on the other hand reduce
The entrance and generation with field trash in casting process are smelted, particularly molten steel air-breathing problem, molten steel air-breathing can bring two harm,
One harm is secondary oxidation of steel, i.e. the element such as dissolved aluminum in molten steel is oxidized to oxide, another harm is to cause
The increase of nitrogen element content in molten steel.With the raising of refining techniques level, removal inclusion content in melting steel has reached higher
Level, at present, prevents the molten steel air-breathing in casting process from becoming more and more important.
Nitrogen is solution strengthening element in steel, phenomena such as causing timeliness and blue shortness, moreover it is possible to the generation such as titanium, aluminium compared with
For sharp field trash；Nitrogen in steel can reduce toughness, plasticity, welding performance of steel etc..Nitrogen content in molten steel is refining
Content is minimum during steel terminal, the nitrogen in molten steel increase mainly after refining and casting process in caused by air-breathing.Cause
This, the air-breathing in casting process is, it is necessary to take molding casting to prevent molten steel from inhaling nitrogen in order to prevent.
Deoxidation carries out deoxidation using aluminium more in molten steel, and in order to obtain relatively low dissolved oxygen, general control acid-soluble aluminum content exists
Between 0.025-0.045%, and some high-aluminum steels such as 38CrMoAl acid-soluble aluminum contents are more up to 0.7-1.1%.If pouring
Molten steel air-breathing during note, the dissolved aluminum in molten steel will generate aluminate with the oxygen in air, so that in cast
Cause nozzle blocking, store a series of problems, such as stream.
The air-breathing in Ladle Cycling and casting process improves Molten Steel Cleanliness in order to prevent, at present in continuous casting production process
In, big bag molding casting is generally realized using big water-coating port and big bag long nozzle argon blowing seal.But seam crossing therebetween
Air easily is sucked because of negative pressure caused by the steel stream of cast, so as to cause the increase of nitrogen content and oxygen content in molten steel.Make
The shortcomings of easily being blocked when being primarily present poor anaphase effect and excessive steel with ventilative ring type argon blowing seal mode, and seal washer is then deposited
Fragile and sealing effect is unstable the shortcomings of.
Have some patents at present and carry out Argon using long nozzle to utilize big bag potential energy, such as patent of invention
CN102864283A, patent name are：A kind of Argon-blowing long nozzle for clean steel；This application is in long nozzle madial wall and lateral wall
Between set a ring-shaped air chamber connected with Argon conduit；Ring-shaped air chamber is toward the direction that radially extends of mouth of a river madial wall, the mouth of a river
The air hole with ring-shaped air chamber inside multiple connection mouths of a river is further opened with madial wall.This application argon gas is blown by Argon adapter
Air inlet chamber, argon gas are blown into molten steel in gas chamber by each air hole, and at the mouth of a river, inner wall can produce more minute bubbles,
Minute bubbles can be smashed into more tiny bubble by the shearing force that the velocity gradient of molten steel flow produces at the same time.Minute bubbles capture field trash
Float rapidly after into tundish, adsorbed by tundish covering flux, improve the cleannes of strand.Patent of invention
CN104139179A, patent name are：A kind of multi-functional argon blowing long nozzle, this application it is also proposed that improve argon blowing long nozzle so as to
Preferably carry out argon gas-sealed and produce minute bubbles using big bag potential energy.However, above-mentioned application case is to long nozzle Argon portion
Divide the technological improvement carried out, long nozzle is not improved and innovated.Patent of invention CN102864283A is on long nozzle
End sets step-like funnel, also primarily to long nozzle can be docked preferably with ladle, preferably wraps up ladle, reaches more
Good sealing effect, can not play the role of good dissipation molten steel potential energy.
China Patent No. ZL201621488358.4, authorized announcement date are on July 14th, 2017, and invention and created name is：
A kind of immersion, which is opened to pour, uses ladle long nozzle；The top of this application long nozzle body is equipped with the rim of a bowl, described the rim of a bowl and inner cavity phase
Unicom, long nozzle body lower end intracavity diameter are more than the intracavity diameter of long nozzle body upper end, and inner cavity is in bell mouth shape.This application
Case expands ladle long nozzle body lower end cavity volume, even if opening has residual air when pouring, expanded by heating pressure very little will not
Impact is formed to sealing between long nozzle and ladle outlet, the sealing leak between long nozzle and ladle outlet is avoided, improves to open and pour
Quality.But the bell-mouth structure of air that this application relies primarily on the setting of long nozzle body lower end avoids the formation of impact, and molten steel is passing through
The last moment of long nozzle could further scatter, and dissipation molten steel potential energy is more passive, and effect is undesirable；And in order not to produce compared with
Big impact depth, lower end bell-mouth structure of air sectional area can design larger, long nozzle existing defects in structure design.
Number of patent application 201220256725.3, the applying date are on June 2nd, 2012, and invention and created name is：Tundish is used
Mouth of a river flow control device；This application includes stopper and the mouth of a river, and the mouth of a river is fixed on the backpack body bottom of tundish, and the middle part at the mouth of a river is equipped with
Runner, is equipped with stopper directly over the mouth of a river, and stopper is located at backpack body intracavitary, is equipped with the top at the mouth of a river to the convex of backpack body inner cavity protrusion
Platform, the lower end of stopper are equipped with groove, and groove is covered on the outer wall of boss.This application can effectively control molten steel flow, prevent
Waterstop port blocks.But this application the degree of automation is not high, it is not easy to control.
The content of the invention
1. technical problems to be solved by the inivention
The problem of present invention is proposed for background technology, there is provided one kind improves tundish molten steel under unstable state state
The system and method for cleanliness factor, the present invention are blown by setting Zhu Liu area's dissipation molten steel potential energy in the middle part of long nozzle in the area
Enter argon gas, argon gas rises to the argon gas atmosphere that seal area forms micro-positive pressure, effectively prevents molten steel air-breathing；Consumed using Zhu Liu areas molten steel
Argon gas is broken into minute bubbles by scattered kinetic energy, and is carried along into tundish by molten steel with further removal of inclusions；Long nozzle goes out
Mouthful it is in bell mouth shape, further dissipation molten steel potential energy is to mitigate the impact to Metal in Tundish；On the other hand, by being controlled to the mouth of a river
The structure for flowing device is improved, and molten steel is entered between spill stopper and flow control disk mouth, by adjusting spill stopper and flow control disk
Gap between mouthful farthest prevents the formation of reflux whirlpool, achievees the purpose that final purification molten steel.
2. technical solution
To reach above-mentioned purpose, technical solution provided by the invention is：
A kind of system of raising tundish Cleanliness of Molten Steel under unstable state state of the present invention, including long nozzle body,
Tundish and mouth of a river flow control device, described long nozzle body one end set the rim of a bowl, the rim of a bowl docking ladle water outlet, and the rim of a bowl
Seal washer is set between ladle water outlet, and long nozzle body interior is equipped with hollow cavity；Inner cavity is straight in the middle part of long nozzle body
Footpath is more than both ends intracavity diameter, forms Zhu Liu areas；The long nozzle body outlet sets horn mouth, and horn mouth docking is middle
Bag, the mouth of a river flow control device include automatic hoisting mechanism, stopper, molten steel liquid level measurement instrument and flow control Pan Kou, the control
Flow table mouth inner hollow, flow control Pan Kou pass through tundish bottom, stretch into inside tundish, flow control Pan Kou bottoms connection immersion
The mouth of a river；The top installation stopper of flow control Pan Kou, and automatic hoisting mechanism is installed on stopper, automatic hoisting mechanism control stopper
Vertically moving, the molten steel liquid level measurement instrument is installed on tundish top.
As further improvement of the present invention, the Zhu Liu areas on one end side wall of near bowl mouth by being provided with Argon
Hole, Argon conduit connection argon blowing hole, argon gas are blown into long nozzle Zhu Liu areas by Argon conduit.
As further improvement of the present invention, the Argon conduit is provided at circumferentially spaced 4-6 along Zhu Liu areas side wall.
As further improvement of the present invention, on the Zhu Liu areas side wall, distance Zhu Liu areas and upper end long nozzle sheet
The Argon conduit that an at least row is uniformly distributed circumferentially is equipped with the position 30cm of body boundary, often row sets 4-6 Argon conduit.
As further improvement of the present invention, the Zhu Liu areas are arranged at the 140-170cm of the rim of a bowl lower part, storage
Flow 1.3-1.8 times that area's intracavity diameter is both ends long nozzle chamber body diameter.
As further improvement of the present invention, the long nozzle body exports 10cm sections of setting horn mouths, the loudspeaker
Mouth intracavity diameter is 1.4-1.6 times of long nozzle chamber body diameter.
As further improvement of the present invention, the stopper lower end is concave shaped, the internal diameter of the concave inward structure and control
Flow table mouth outside diameter is consistent；The flow control disk mouth outside diameter is fitted close with tundish bottom, flow control disk mouth internal diameter and immersion water
Tight-lipped close fit.
As further improvement of the present invention, molten steel liquid level measurement instrument is infrared induction measuring instrument, molten steel liquid
Position measuring instrument is electrically connected with stroke computer, and stroke computer control automatic hoisting mechanism drives stopper, to control the height of stopper.
As further improvement of the present invention, the automatic hoisting mechanism includes lifter rack and motor, lifting tooth
Bar is fixed on stopper external wall of upper portion, motor driving lifter rack movement.
The method of a kind of raising tundish Cleanliness of Molten Steel under unstable state state of the present invention, first by ladle water outlet
Open, after confirming that ladle water outlet can be opened, ladle water outlet is closed, then the rim of a bowl and ladle by the long nozzle body
Water outlet docks, and by Argon conduit to Zhu Liu areas Argon, then second of opening ladle water outlet, which is opened, pours molten steel, second dozen
After opening ladle water outlet, the argon flow amount being blown into is 30-60L/h, and Argon pressure is 0.1-2Mpa, and molten steel is through long nozzle bulk flow
Enter tundish；In the transient that Metal in Tundish liquid level declines, molten steel liquid level measurement instrument measures the liquid level position of molten steel in real time
Put, and feed back to automatic hoisting mechanism, automatic hoisting mechanism judges real-time liquid steel level position and critical localisation reduced value, passes through
Lifter rack controls the elevating movement of stopper, so as to adjust the gap between stopper and flow control disk mouth, prevents the production of confluence whirlpool
It is raw.
3. beneficial effect
Using technical solution provided by the invention, compared with existing known technology, there is following remarkable result：
(1) system of a kind of raising tundish Cleanliness of Molten Steel under unstable state state of the invention, by improving tradition
Long nozzle structure, sets intracavity diameter to be more than the Zhu Liu areas of long nozzle both ends intracavity diameter so that steel in the middle part of long nozzle body
Molten steel in bag enters the tundish of lower section in a step-wise manner, and molten steel potential energy is fully dissipated in long nozzle Zhu Liu areas, effectively
Alleviate impact of the molten steel to tundish；
(2) system of a kind of raising tundish Cleanliness of Molten Steel under unstable state state of the invention, using in long nozzle
Bu Zhuliu areas are blown into argon gas and storing for argon gas are formed in Zhu Liu areas, and Zhu Liu areas formation argon gas atmosphere, which seals long nozzle, prevents steel
Water inhales nitrogen, at the same time, since the Zhu Liu areas at middle part cause the impact of molten steel to impact part argon gas into quilt after small Argon Bubble
Molten steel winding enters in tundish, and the ability of tundish removal of inclusions is improved at the same time in the degree of purity that ensure that molten steel；
(3) system of a kind of raising tundish Cleanliness of Molten Steel under unstable state state of the invention, exports in long nozzle
Certain improved shape has been done at end, that is, it is in bell mouth shape to design long nozzle outlet, and horn mouth intracavity diameter is only long nozzle sheet
1.4-1.6 times of intracoelomic cavity diameter, is designed relative to traditional typhon mouth, and one aspect of the present invention has Zhu Liu areas in front end
Under the premise of, can the long nozzle port of export further dissipation molten steel potential energy to mitigate the impact to Metal in Tundish；Another aspect loudspeaker
Open area is smaller so that long nozzle more optimized structure；
(4) system of a kind of raising tundish Cleanliness of Molten Steel under unstable state state of the invention, not only will directly blow
Argon conduit is arranged on Zhu Liu areas, and is circumferentially uniformly distributed multiple Argon conduits, Argon conduit symmetric radiation shape along Zhu Liu areas side wall
Design multiple, the uniform atmosphere of argon gas is easily formed, easy to seal；Qie Zhuliu areas inner cavity is thicker, has also given argon gas more spaces,
Molten steel enters Zhu Liu areas, and argon gas in time uniformly can protect molten steel, molten steel potential energy when Zhu Liu areas dissipate also more just
To form minute bubbles in neighbouring argon gas suction is broken up and enter tundish with molten steel；
(5) system of a kind of raising tundish Cleanliness of Molten Steel under unstable state state of the invention, design stopper lower end
For concave shaped, molten steel is set to enter between spill stopper and flow control disk mouth, by adjusting between spill stopper and flow control disk mouth
Gap farthest prevents the formation of reflux whirlpool, achievees the purpose that to purify molten steel；
(6) system of a kind of raising tundish Cleanliness of Molten Steel under unstable state state of the invention, wraps peace among it
The molten steel liquid level measurement instrument of dress can measure the liquid level position of molten steel in real time, and timely feed back to installed in spill stopper
The automatic hoisting mechanism of external wall of upper portion, automatic hoisting mechanism lead to after real-time liquid steel level position and critical localisation reduced value is judged
The elevating movement of lifter rack control spill stopper is crossed, so as to adjust the gap between spill stopper and flow control disk mouth, is realized
The effect for controlling the anti-backflow whirlpool of molten steel flow to produce, whole process automation carry out, and without manual control, and pass through row
The control of journey computer can ensure that the gap between spill stopper and flow control disk mouth is accurate.
Brief description of the drawings
Fig. 1 is the argon blowing seal of the present invention and the long nozzle structure diagram of purifying of steel；
Fig. 2 is the structure diagram of the mouth of a river flow control device of the present invention；
Fig. 3 is the structure diagram of middle concave stopper of the present invention and flow control Pan Kou.
Label declaration in schematic diagram：
1st, ladle water outlet；2nd, seal washer；3rd, long nozzle body；4th, Argon conduit；5th, Zhu Liu areas；6th, horn mouth；7、
Automatic hoisting mechanism；71st, lifter rack；72nd, motor；8th, stopper；9th, molten steel liquid level measurement instrument；10th, tundish；11st, flow control disk
Mouthful；12nd, submersed nozzle.
Embodiment
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
With reference to Fig. 1, a kind of system of raising tundish Cleanliness of Molten Steel under unstable state state of the present embodiment, including length
Mouth of a river body 3, tundish 10 and mouth of a river flow control device, long nozzle body 3 are arranged on ladle and tundish junction.Long nozzle sheet
Body 3 protrudes to be middle, and lower end outlet be in horn-like diameter-changing body, and specially 3 upper end of long nozzle body is funnel-form the rim of a bowl, the bowl
Mouth docking ladle water outlet 1, and seal washer 2 is set between the rim of a bowl and ladle water outlet 1.During long nozzle body 3 is internally provided with
Empty inner cavity, the present embodiment are setting Zhu Liu areas 5 at the 150cm of the rim of a bowl lower part, and 5 intracavity diameter of Zhu Liu areas is more than both ends long nozzle
The intracavity diameter of body 3.The molten steel that the main function in Zhu Liu areas 5 is so that in ladle enters the centre of lower section in a step-wise manner
Bag, molten steel potential energy is fully dissipated in Zhu Liu areas 5, to mitigate impact of the molten steel to tundish.Meanwhile form argon in Zhu Liu areas
Gas stores, and forming argon gas atmosphere sealing long nozzle prevents molten steel from inhaling nitrogen.Inventor passes through long-term theoretical research, and in steel mill
Practice summary, it is believed that set 5 intracavity diameter of Zhu Liu areas to compare conjunction for 1.3-1.8 times of 3 intracavity diameter of both ends long nozzle body
It is suitable, specific to 1.5 times that 5 intracavity diameter of the present embodiment Zhu Liu areas is 3 intracavity diameter of both ends long nozzle body.
The present embodiment is set on 5 side wall of Zhu Liu areas at distance Zhu Liu areas 5 and 3 boundary position 30cm of upper end long nozzle body
Argon blowing hole is put, Argon conduit 4 is directly connected to argon blowing hole, and Argon conduit 4 is provided at circumferentially spaced 4 along 5 side wall of Zhu Liu areas, argon gas
Long nozzle Zhu Liu areas 5 are blown into by Argon conduit 4.4 symmetric radiation shape of Argon conduit designs 4, is easily formed the uniform gas of argon gas
Atmosphere, easy to seal.
What deserves to be explained is the raising for Molten Steel Cleanliness, except preventing extraneous gas entrance forms oxide from also needing
Remove the deoxidation products after tapping.According to existing theory, it is simple and effective to capture field trash and removal of floating by bubble
Means.Meanwhile related research shows：The bubble of effective removal of inclusions should be tiny bubble, and optimum range is in 2-15mm.The back of the body
The patent of invention CN102864283A mentioned in scape technology, patent name are：A kind of Argon-blowing long nozzle for clean steel；I.e. using big
Air pocket is smashed into minute bubbles by the shearing force that the potential energy of Baogang's water produces, and forms the more preferable removal of inclusions of tiny bubble.
Though Argon conduit 4 is directly arranged on Zhu Liu areas 5 by the present embodiment also with above-mentioned theory, the present embodiment, by
Inner cavity is thicker at Zhu Liu areas 5, has given argon gas more spaces.One is easily formed argon gas atmosphere, easy to sealing；Two carry out molten steel
Into Zhu Liu areas 5, argon gas in time uniformly can protect molten steel, then have molten steel potential energy when Zhu Liu areas 5 dissipate also more
Easy to which neighbouring argon gas is sucked, fully break up to form tiny bubble and enter tundish with molten steel, improve tundish removal
The ability of field trash.And in terms of argon blowing seal, traditional Argon is all that argon blowing hole is arranged on long nozzle upper end, against parcel steel
Argon is carried out at bag water outlet 1, it is fewer so to leave the space of Argon for, cause interface sealing effect be not it is fine, not
It can effectively prevent molten steel and inhale nitrogen.And the argon gas that the present embodiment Zhu Liu areas 5 take in is more, there is smaller pressure can be by argon gas top to steel
At bag water outlet 1, even preferably sealing effect can be reached as traditional Argon mode.
The long nozzle body 3 exports 10cm sections of setting horn mouths 6, which is long water
1.4 times of mouth 3 intracavity diameter of body, bottom intracavity diameter is 1.6 times of 3 intracavity diameter of long nozzle body, and horn mouth 6 docks
Tundish 10.The present embodiment sets Zhu Liu areas 5 so that ladle by improving traditional long nozzle structure in the middle part of long nozzle body
Interior molten steel enters the tundish of lower section in a step-wise manner, and molten steel potential energy is fully dissipated in long nozzle Zhu Liu areas, effectively
Impact of the molten steel to tundish is alleviated, middle buffer distance can also be adjusted according to actual conditions, the dissipation to potential energy
More flexible also more active.The mode of typhon mouth is separately provided in long nozzle lower end relative to tradition, on the one hand in front end
On the premise of You Zhuliu areas 5, can the long nozzle port of export further dissipation molten steel potential energy to mitigate the impact to Metal in Tundish；
The horn mouth area of another aspect the present embodiment is smaller, and impact depth is smaller, will not when early period, molten steel depth ratio was shallower
Refractory material is flushed to, slag blanket is not easy to be involved in molten steel.
With reference to Fig. 2 and Fig. 3, the mouth of a river flow control device of the present embodiment, including automatic hoisting mechanism 7, stopper 8, molten steel liquid level
Measuring instrument 9 and flow control disk mouth 11.The flow control disk mouth 11 passes through 10 bottom of tundish, stretches into inside tundish 10, the flow control
11 inner hollow of disk mouth, bottom connection submersed nozzle 12.11 outside diameter of flow control disk mouth and 10 bottom close installation of tundish, in it
Molten steel is injected crystallizer by portion's close installation submersed nozzle 12.
The top hanging of the flow control disk mouth 11 stretched into inside tundish has stopper 8, and installs escalator on stopper 8
Structure 7, the automatic hoisting mechanism 7 control stopper 8 is vertically moving, and the molten steel liquid level measurement instrument 9 is installed on tundish
10 tops.8 lower end of stopper is concave shaped, and the internal diameter of the concave inward structure is consistent with flow control disk 11 outside diameters of mouth.
The present embodiment molten steel liquid level measurement instrument 9 is infrared induction measuring instrument.Molten steel liquid level measurement instrument 9 is electrically connected with stroke computer
Connect, stroke computer can go out the liquid level position of molten steel this moment and real-time according to the distance exam of molten steel to molten steel liquid level measurement instrument 9
Feed back to automatic hoisting mechanism 7.The automatic hoisting mechanism 7 can according to molten steel liquid level measure instrument 9 feedback come data sentence
The critical localisation of disconnected molten steel, and automatic lifting stopper 8, to control the height of stopper 8.
It is arcuation that flow control disk mouth 11, which stretches out 10 inside one end of tundish, and can be replaced according to wear condition；It is described from
Dynamic elevating mechanism 7 includes lifter rack 71 and motor 72, and lifter rack 71 is fixed on 8 external wall of upper portion of stopper, the control of stroke computer
Motor 72 drives lifter rack 71 to move.
The mouth of a river flow control device of the present embodiment, molten steel liquid level measurement instrument 9 are used for the liquid level position for measuring molten steel；Flow control Pan Kou
11 flowing for controlling molten steel；Spill stopper is used for the generation for controlling confluence whirlpool；Automatic hoisting mechanism 7 is used to control spill
The position of stopper.It is concave shaped to design 8 lower end of stopper, molten steel is entered between spill stopper and flow control disk mouth 11, passes through tune
Gap between section spill stopper and flow control disk mouth 11 farthest prevents the formation of reflux whirlpool, reaches purification molten steel
Purpose.The molten steel liquid level measurement instrument 9 installed on tundish 10 can measure the liquid level position of molten steel in real time, and timely anti-
Feed and judging real-time liquid steel level position installed in the automatic hoisting mechanism 7 of spill stopper external wall of upper portion, automatic hoisting mechanism 7
Elevating movement with controlling spill stopper after critical localisation reduced value by lifter rack 71, so as to adjust spill stopper and flow control
Gap between disk mouth 11, realizes the effect that the anti-backflow whirlpool of control molten steel flow produces, and whole process automation carries out,
It can ensure that the gap between spill stopper and flow control disk mouth 11 is accurate without manual control, and by the control of stroke computer
Really, the generation of confluence whirlpool is effectively prevented, the cleanliness factor of molten steel is improved, improves slab quality.
The present embodiment have also been devised a kind of raising tundish steel under unstable state state to coordinate the structure of long nozzle to improve
The method of water cleanliness factor, detailed process are：Ladle water outlet 1 is opened first, after confirming that ladle water outlet 1 can be opened, by steel
Bag water outlet 1 is closed, then the rim of a bowl of long nozzle body 3 is docked with ladle water outlet 1, is blown by Argon conduit 4 to Zhu Liu areas 5
Argon, then second of opening ladle water outlet 1, which is opened, pours molten steel, controls the argon flow amount being blown at this time in the range of 30-40L/h,
Argon pressure is in the range of 0.1-1Mpa.Argon gas rises to the argon gas atmosphere that seal area forms micro-positive pressure, Neng Gouyou under the conditions of this
Effect prevents molten steel air-breathing, and the kinetic energy that Qie Zhuliu areas molten steel dissipates fully can smash argon gas, minute bubbles be formed, into tundish
With further removal of inclusions, ensure the cleanliness factor of molten steel.Molten steel flows into tundish 10 through long nozzle body 3；In tundish 10
The transient that liquid steel level declines, molten steel liquid level measurement instrument 9 measures the liquid level position of molten steel in real time, and feeds back to automatic liter
Descending mechanism 7, automatic hoisting mechanism 7 judge real-time liquid steel level position and critical localisation reduced value, are controlled by lifter rack 71
The elevating movement of stopper 8, so as to adjust the gap between stopper 8 and flow control disk mouth 11, prevents the generation of confluence whirlpool.
Embodiment 2
A kind of system of raising tundish Cleanliness of Molten Steel under unstable state state of the present embodiment, substantially with embodiment 1,
Its difference is：The present embodiment is setting Zhu Liu areas 5,5 intracavity diameter of Zhu Liu areas at long water gap bowl mouth lower part 140cm
For 1.3 times of 3 intracavity diameter of both ends long nozzle body.On 5 side wall of Zhu Liu areas, distance Zhu Liu areas 5 are handed over upper end long nozzle body 3
Two rows of Argon conduits being uniformly distributed circumferentially are equipped with the 30cm of boundary position, often row sets 6 Argon conduits.And in order to coordinate length
The structure at the mouth of a river is improved, and the present embodiment controls the argon flow amount being blown into 50-60L/h after second is opened ladle water outlet
In the range of, Argon pressure is in the range of 0.5-1.5Mpa.
Embodiment 3
A kind of system of raising tundish Cleanliness of Molten Steel under unstable state state of the present embodiment, substantially with embodiment 1,
Its difference is：The present embodiment is setting Zhu Liu areas 5,5 intracavity diameter of Zhu Liu areas at long water gap bowl mouth lower part 170cm
For 1.8 times of 3 intracavity diameter of both ends long nozzle body.On 5 side wall of Zhu Liu areas, distance Zhu Liu areas 5 are handed over upper end long nozzle body 3
Two rows of Argon conduits being uniformly distributed circumferentially are equipped with the 30cm of boundary position, often row sets 5 Argon conduits.And in order to coordinate length
The structure at the mouth of a river is improved, and the present embodiment controls the argon flow amount being blown into 40-50L/h after second is opened ladle water outlet
In the range of, Argon pressure is in the range of 1-2Mpa.
Schematically the present invention and embodiments thereof are described above, this describes no restricted, institute in attached drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So if common skill of this area
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (10)
1. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state, including long nozzle body (3), tundish
(10) and mouth of a river flow control device, described long nozzle body (3) one end set the rim of a bowl, the rim of a bowl docking ladle water outlet (1), and
Seal washer (2) is set between the rim of a bowl and ladle water outlet (1), and long nozzle body (3) is internally provided with hollow cavity；Its feature exists
In：Intracavity diameter is more than both ends intracavity diameter in the middle part of long nozzle body (3), is formed Zhu Liu areas (5)；The long nozzle body
(3) outlet sets horn mouth (6), horn mouth (6) docking tundish (10), and the mouth of a river flow control device includes escalator
Structure (7), stopper (8), molten steel liquid level measurement instrument (9) and flow control Pan Kou (11), described flow control Pan Kou (11) inner hollow, the control
Flow table mouth (11) passes through tundish (10) bottom, stretches into tundish (10) inside, flow control Pan Kou (11) bottom connection immersion water
Mouth (12)；The top installation stopper (8) of flow control Pan Kou (11), and automatic hoisting mechanism (7) is installed on stopper (8), this is automatic
Elevating mechanism (7) control stopper (8) is vertically moving, and molten steel liquid level measurement instrument (9) is installed on tundish (10)
Top.
2. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state according to claim 1, its feature
It is：The Zhu Liu areas (5) are by being provided with argon blowing hole, Argon conduit (4) connection argon blowing hole, argon on one end side wall of near bowl mouth
Gas is blown into long nozzle Zhu Liu areas (5) by Argon conduit (4).
3. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state according to claim 2, its feature
It is：The Argon conduit (4) is provided at circumferentially spaced 4-6 along Zhu Liu areas (5) side wall.
4. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state according to claim 2, its feature
It is：On described Zhu Liu areas (5) side wall, distance Zhu Liu areas (5) at upper end long nozzle body (3) boundary position 30cm with being equipped with
The Argon conduit (4) that an at least row is uniformly distributed circumferentially, 4-6 Argon conduit (4) of often row's setting.
5. it is according to a kind of tundish Cleanliness of Molten Steel under unstable state state that improves of claim 1-4 any one of them
System, it is characterised in that：The Zhu Liu areas (5) are arranged at the 140-170cm of the rim of a bowl lower part, Zhu Liu areas (5) intracavity diameter
For 1.3-1.8 times of both ends long nozzle body (3) intracavity diameter.
6. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state according to claim 5, its feature
It is：The long nozzle body (3) exports 10cm sections and sets horn mouth (6), which is long nozzle sheet
1.4-1.6 times of body (3) intracavity diameter.
7. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state according to claim 6, its feature
It is：Described stopper (8) lower end is concave shaped, and the internal diameter of the concave inward structure is consistent with flow control Pan Kou (11) outside diameter；Described
Flow control Pan Kou (11) outside diameters are fitted close with tundish (10) bottom, and flow control Pan Kou (11) internal diameters are close with submersed nozzle (12)
Coordinate.
8. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state according to claim 7, its feature
It is：The molten steel liquid level measurement instrument (9) is infrared induction measuring instrument, and molten steel liquid level measurement instrument (9) is electrically connected with stroke computer
Connect, stroke computer control automatic hoisting mechanism (7) drives stopper (8), to control the height of stopper (8).
9. a kind of system for improving tundish Cleanliness of Molten Steel under unstable state state according to claim 8, its feature
It is：The automatic hoisting mechanism (7) includes lifter rack (71) and motor (72), and lifter rack (71) is fixed on stopper
(8) external wall of upper portion, motor (72) driving lifter rack (71) movement.
A kind of 10. method for improving tundish Cleanliness of Molten Steel under unstable state state, it is characterised in that：First by ladle water outlet
Mouth (1) is opened, and after confirming that ladle water outlet (1) can be opened, ladle water outlet (1) is closed, then will be as any such as claim 1-6
The rim of a bowl of long nozzle body (3) described in is docked with ladle water outlet (1), is blown by Argon conduit (4) to Zhu Liu areas (5)
Argon, then second opens ladle water outlet (1) and opens and pours molten steel, after second is opened ladle water outlet (1), the argon gas stream that is blown into
It is 0.1-2Mpa to measure as 30-60L/h, Argon pressure, and molten steel flows into tundish (10) through long nozzle body (3)；In tundish
(10) transient that liquid steel level declines, molten steel liquid level measurement instrument (9) measure the liquid level position of molten steel in real time, and feed back to
Automatic hoisting mechanism (7), automatic hoisting mechanism (7) judge real-time liquid steel level position and critical localisation reduced value, pass through lifting
The elevating movement of rack (71) control stopper (8), so as to adjust the gap between stopper (8) and flow control Pan Kou (11), prevents from converging
Flow the generation of whirlpool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711282843.5A CN107983943B (en) | 2017-12-07 | 2017-12-07 | A kind of system and method improving tundish Cleanliness of Molten Steel under unstable state state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711282843.5A CN107983943B (en) | 2017-12-07 | 2017-12-07 | A kind of system and method improving tundish Cleanliness of Molten Steel under unstable state state |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107983943A true CN107983943A (en) | 2018-05-04 |
| CN107983943B CN107983943B (en) | 2019-07-05 |
Family
ID=62036556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711282843.5A Active CN107983943B (en) | 2017-12-07 | 2017-12-07 | A kind of system and method improving tundish Cleanliness of Molten Steel under unstable state state |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107983943B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112792331A (en) * | 2021-04-06 | 2021-05-14 | 北京科技大学 | Method and system for blowing argon gas from bottom of ladle in pouring process and application |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1110292A (en) * | 1997-06-25 | 1999-01-19 | Nkk Corp | Long nozzle for continuous casting |
| JP2002254162A (en) * | 2001-02-28 | 2002-09-10 | Kurosaki Harima Corp | Drift preventing constitution for immersion nozzle |
| JP2004322119A (en) * | 2003-04-22 | 2004-11-18 | Jfe Steel Kk | Fountain for continuous casting |
| JP2005052865A (en) * | 2003-08-04 | 2005-03-03 | Sumitomo Metal Ind Ltd | Immersion nozzle for continuous castings and continuous casting method using it |
| JP2008062288A (en) * | 2006-09-11 | 2008-03-21 | Nippon Steel Corp | Method and structure for sealing nozzle joint part in continuous casting facility for steel |
| CN202490928U (en) * | 2012-03-31 | 2012-10-17 | 安徽工业大学 | Extended nozzle device capable of eliminating inclusions for tundish |
| CN202606825U (en) * | 2012-06-02 | 2012-12-19 | 莱芜市创远耐火材料有限公司 | Gate flow control device for pouring box |
| CN102825229A (en) * | 2012-08-24 | 2012-12-19 | 中冶南方工程技术有限公司 | Flow control structure for preventing vortexes from being generated in tundish |
| CN102864283A (en) * | 2012-09-19 | 2013-01-09 | 中冶南方工程技术有限公司 | Argon-blowing long nozzle for clean steel |
| CN202877537U (en) * | 2012-09-19 | 2013-04-17 | 中冶南方工程技术有限公司 | Argon blowing long nozzle for cleaning steel |
| CN203664656U (en) * | 2013-09-12 | 2014-06-25 | 北京科技大学 | Consumption type steel ladle long nozzle |
| CN104275480A (en) * | 2013-07-05 | 2015-01-14 | 苏州宝明高温陶瓷有限公司 | Submerged nozzle |
| CN204159864U (en) * | 2014-10-13 | 2015-02-18 | 长兴正发热电耐火材料有限公司 | Stopper mouth of a river flow control structure |
| CN204396851U (en) * | 2015-01-16 | 2015-06-17 | 长兴正发热电耐火材料有限公司 | A kind ofly can close the stopper rod flow control structure at the mouth of a river by temporary emergency |
| CN204912747U (en) * | 2015-09-06 | 2015-12-30 | 武汉钢铁(集团)公司 | Crystallizer vortex immersion nozzle |
| CN205270851U (en) * | 2015-12-23 | 2016-06-01 | 太仓宏达俊盟新材料有限公司 | Mouth of a river under ventilative ladle |
| CN206326126U (en) * | 2016-12-30 | 2017-07-14 | 维苏威高级陶瓷(中国)有限公司 | A kind of immersion, which is opened to pour, uses ladle long nozzle |
| CN206702210U (en) * | 2017-04-19 | 2017-12-05 | 青岛东冶耐火材料有限公司 | A kind of multi-stage sealed formula long nozzle |
-
2017
- 2017-12-07 CN CN201711282843.5A patent/CN107983943B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1110292A (en) * | 1997-06-25 | 1999-01-19 | Nkk Corp | Long nozzle for continuous casting |
| JP2002254162A (en) * | 2001-02-28 | 2002-09-10 | Kurosaki Harima Corp | Drift preventing constitution for immersion nozzle |
| JP2004322119A (en) * | 2003-04-22 | 2004-11-18 | Jfe Steel Kk | Fountain for continuous casting |
| JP2005052865A (en) * | 2003-08-04 | 2005-03-03 | Sumitomo Metal Ind Ltd | Immersion nozzle for continuous castings and continuous casting method using it |
| JP2008062288A (en) * | 2006-09-11 | 2008-03-21 | Nippon Steel Corp | Method and structure for sealing nozzle joint part in continuous casting facility for steel |
| CN202490928U (en) * | 2012-03-31 | 2012-10-17 | 安徽工业大学 | Extended nozzle device capable of eliminating inclusions for tundish |
| CN202606825U (en) * | 2012-06-02 | 2012-12-19 | 莱芜市创远耐火材料有限公司 | Gate flow control device for pouring box |
| CN102825229A (en) * | 2012-08-24 | 2012-12-19 | 中冶南方工程技术有限公司 | Flow control structure for preventing vortexes from being generated in tundish |
| CN102864283A (en) * | 2012-09-19 | 2013-01-09 | 中冶南方工程技术有限公司 | Argon-blowing long nozzle for clean steel |
| CN202877537U (en) * | 2012-09-19 | 2013-04-17 | 中冶南方工程技术有限公司 | Argon blowing long nozzle for cleaning steel |
| CN104275480A (en) * | 2013-07-05 | 2015-01-14 | 苏州宝明高温陶瓷有限公司 | Submerged nozzle |
| CN203664656U (en) * | 2013-09-12 | 2014-06-25 | 北京科技大学 | Consumption type steel ladle long nozzle |
| CN204159864U (en) * | 2014-10-13 | 2015-02-18 | 长兴正发热电耐火材料有限公司 | Stopper mouth of a river flow control structure |
| CN204396851U (en) * | 2015-01-16 | 2015-06-17 | 长兴正发热电耐火材料有限公司 | A kind ofly can close the stopper rod flow control structure at the mouth of a river by temporary emergency |
| CN204912747U (en) * | 2015-09-06 | 2015-12-30 | 武汉钢铁(集团)公司 | Crystallizer vortex immersion nozzle |
| CN205270851U (en) * | 2015-12-23 | 2016-06-01 | 太仓宏达俊盟新材料有限公司 | Mouth of a river under ventilative ladle |
| CN206326126U (en) * | 2016-12-30 | 2017-07-14 | 维苏威高级陶瓷(中国)有限公司 | A kind of immersion, which is opened to pour, uses ladle long nozzle |
| CN206702210U (en) * | 2017-04-19 | 2017-12-05 | 青岛东冶耐火材料有限公司 | A kind of multi-stage sealed formula long nozzle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112792331A (en) * | 2021-04-06 | 2021-05-14 | 北京科技大学 | Method and system for blowing argon gas from bottom of ladle in pouring process and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107983943B (en) | 2019-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104364032B (en) | Method for manufacturing high-purity steel casting, and tundish | |
| CN102728827B (en) | Continuous casting tundish capable of improving molten steel cleanliness | |
| CN204842961U (en) | Get rid of immersion nozzle of inclusion | |
| EP3827915A1 (en) | Tundish | |
| CN202490928U (en) | Extended nozzle device capable of eliminating inclusions for tundish | |
| CN108927511A (en) | A kind of long nozzle preventing outlet flow deflection | |
| CN107983943B (en) | A kind of system and method improving tundish Cleanliness of Molten Steel under unstable state state | |
| CN104249149B (en) | A kind of channel-type sensing heating tundish and its casting method | |
| CN204770627U (en) | Packing is put in middle of single current passageway formula induction heating bend pipe type passageway | |
| CN203484651U (en) | Continuous casting steel liquid ladle low in vortex and high in molten steel yield | |
| CN107755679A (en) | The long nozzle device and argon jetting method of a kind of argon blowing seal and purifying of steel | |
| CN207521700U (en) | A kind of long nozzle device of argon blowing seal and purifying of steel | |
| JP5751078B2 (en) | Manufacturing method of high cleanliness steel slab by continuous casting | |
| CN113857434A (en) | Metal separation sheet pouring basin device | |
| JP5556465B2 (en) | Manufacturing method of high cleanliness steel slab by continuous casting | |
| CN207577413U (en) | A kind of mouth of a river flow control device for preventing continuous casting production from generating confluence whirlpool when pouring into a mould | |
| CN210877531U (en) | Argon protective cover for pouring special steel | |
| CN209555281U (en) | A kind of dual-purpose slag disk of iron-making and steel-making | |
| CN207288881U (en) | A kind of Con casting ladle long nozzle alignment device | |
| CN201313174Y (en) | Upper honeycomb duct and tundish thereof for vacuum ingot casting | |
| CN217121734U (en) | Spiral-flow type immersion nozzle | |
| CN216297909U (en) | Metal separation sheet pouring basin device | |
| CN212443239U (en) | Ladle is with drainage sand instrument of adding sand | |
| CN2600198Y (en) | Slag bridge | |
| CN201728365U (en) | Steel ladle and tundish slag carry-over control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |