CN206872867U - A kind of RH refining furnace dip pipes for heating molten steel - Google Patents
A kind of RH refining furnace dip pipes for heating molten steel Download PDFInfo
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- CN206872867U CN206872867U CN201720348110.6U CN201720348110U CN206872867U CN 206872867 U CN206872867 U CN 206872867U CN 201720348110 U CN201720348110 U CN 201720348110U CN 206872867 U CN206872867 U CN 206872867U
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Abstract
The utility model belongs to technical field of ferrous metallurgy, in particular it relates to a kind of RH refining furnace dip pipes for heating molten steel.The RH refining furnace dip pipes of heating molten steel of the present utility model, including tedge and down-comer, wherein, electromagnetic induction coil is embedded in the tedge or down-comer, or, it is embedded to electromagnetic induction coil in tedge and down-comer；Wherein, be embedded to the body of electromagnetic induction coil includes the first cast bed of material (2), steel courage (3), the second cast bed of material (4), electromagnetic induction coil (5) and refractory brick (6) successively from outside to inside.Electromagnetic induction coil is embedded on the inside of steel courage by the utility model, will not be heated to steel courage during heating, the life-span of dip pipe will not be impacted.The utility model can effectively make up the temperature loss in RH refining process.The utility model is avoided that cooling water leaks into caused danger in molten steel using air cooling instead of water cooling, has saved heat, has reduced molten steel temperature drop.
Description
Technical field
The utility model belongs to technical field of ferrous metallurgy, specifically, the utility model is related to a kind of heating molten steel
RH refining furnace dip pipes.
Background technology
RH refining furnaces have excellent de- [C], [N], [H] and go the function being mingled with, and the utility ratio in STEELMAKING PRODUCTION is more next
Higher, RH vacuum drying ovens are by 1 RH vacuum chamber and 2 RH vacuum drying ovens dip pipe (tedge and down-comer) structures for being located at bottommost
Into.During the external refining of RH vacuum drying ovens, dip pipe immerses molten steel, vacuum chamber, is blown from the tedge of dip pipe
Enter argon gas, the molten steel in ladle is entered vacuum chamber from tedge, then flow back into ladle from the down-comer in dip pipe, until
Technique terminates.But in RH refining process, ladle top is due to inserting RH dip pipes, ladle upper position narrow space, nothing
Method installation electrode pair molten steel carries out heat temperature raising, and the problem of for control RH refining furnace liquid steel temperatures, most steel mills are to adopt
With aluminium is added into molten steel, the then oxygen blast into molten steel, Al+3 [O]=Al is utilized2O3Steel is heated in heat release of this chemical reaction
Water, but this method produces substantial amounts of Al2O3It is mingled with, pollutes molten steel, and because the price of aluminium is higher, using Burning Aluminium temperature raising
Method cost is higher.
Chinese patent application CN201510368388.5 disclose a kind of RH refining induction heating temperature compensation device and its
Application method, the technology provided by the invention are：In the periphery of RH tedges or down-comer, electromagnetic induction heater, bag are set
Heating coil, power supply, water-cooled cable are included, power supply connects heating coil by water-cooled cable, and the heating coil is rectangle copper pipe,
The cross section hollow rectangle of copper pipe, the logical cooling water in heating coil inside；Press close to tedge or down-comer one on the inside of heating coil
Side sets 25~50mm thickness low thermal conductivity high-heat resistance shock resistant thermal insulation layers, is the gap of the heating coil turn-to-turn with magnesia ramming
Material tamps.But because electromagnetic induction heater that the technology provides is arranged on the periphery of RH tedges or down-comer, and RH
Tedge or down-comer are played a supportive role when building by laying bricks or stones with steel courage, and electromagnetic induction device is in use, can heat on RH
Steel courage in riser or down-comer, steel courage can be made to soften or melt, have a strong impact on the service life of RH tedges or down-comer,
And because the wall of RH tedges or down-comer is thicker, and electromagnetic induction heating has Kelvin effect, RH tedges or down-comer
Peripheral electromagnetic induction device heating molten steel the thermal efficiency it is relatively low.
Chinese patent application CN201610027588.9 discloses a kind of double hose electricity for heating molten steel and removal of inclusions
Magnetic induction RH device and methods, the device that the invention provides include ladle, vacuum chamber, tedge, down-comer, iron core and the line of induction
Circle, wherein vacuum chamber bottom are provided with tedge and down-comer, and tedge and decline infratubal port connect with ladle, and iron core is solid
Structure, set around tedge or down-comer, coil is wound in the core portion on the outside of top riser or on the outside of down-comer, and line
The axis of circle is vertical with the holding of the axis of tedge or down-comer.Methods described processing step is：(1) made using airlift pump principle
Molten steel produces shuttling movement in vacuum chamber, tedge and down-comer；(2) air-cooled or water cooling plant is opened, in induction coil
It is passed through alternating current, continuous removal of inclusions；(3) treat that liquid steel temperature rises to more than liquidus curve 10~300 DEG C, stop being powered, and stop
Only air-cooled or water cooling plant, molten steel is introduced into next process.The device that the invention provides is more complicated, and the device fills with transformer
Put similar, more energy loss is had in iron core, and in the actual mechanical process of RH refining furnaces, steel is inserted in dip pipe
After liquid, ladle top slag liquid level can rise, and overflow ladle to prevent from pushing up slag, more than 500mm headroom is typically left at the top of ladle
Highly, in order to prevent from ladle top slag sucking vacuum chamber, dip pipe also needs to insert below molten steel face 400mm, ladle top slag slag
Thickness about 200mm, in summary, counted from ladle top, dip pipe need to be under vacuum conditions, one big to underthrust about 1100mm
Molten steel face pressure is risen 1.47m by air pressure, so the total length that dip pipe exposes to vacuum chamber is usually 1200mm or so, dip pipe
Substantially all to insert in ladle, vacuum chamber bottom is basic concordant with the top of ladle, is carried it is difficult to there is space to install in the invention
And iron core, the device such as induction coil, the device that the invention provides is difficult to be applied in actual production.
Utility model content
To solve problem above, the utility model provides a kind of RH refining furnace dip pipes for heating molten steel.
The RH refining furnace dip pipes of heating molten steel of the present utility model, including tedge and down-comer, wherein, described
Embedment electromagnetic induction coil in tedge or down-comer, or, it is embedded to electromagnetic induction coil in tedge and down-comer；Its
In,
Be embedded to the body of electromagnetic induction coil includes the first cast bed of material 2, steel courage 3, the second castable successively from outside to inside
Layer 4, electromagnetic induction coil 5 and refractory brick 6；
In the body without electromagnetic induction coil, the second cast bed of material 4 directly connects with refractory brick 6, i.e. electromagnetic induction
Filled using the castable of the second cast bed of material the position of coil.
Electromagnetic induction coil of the present utility model is embedded on the inside of steel courage, will not when electromagnetic induction coil heats to molten steel
Steel courage is heated to, the life-span of dip pipe will not be impacted.There is one layer of castable between steel courage and electromagnetic induction coil, rise
To the effect of insulator and resistance to material.
According to RH refining furnaces dip pipe described in the utility model, wherein, the electromagnetic induction coil 5 is by metal spool
Winding composition, the metal wire tube section be hollow, rectangular, the metal wire tube section specification for (50~70) mm × (20~
40)mm.Preferably, copper coil can be used.It is possible to further use insulating carriage Motionless electromagnetic induction coil,
And insulating carriage is connected and fixed with steel courage.
RH refining furnaces dip pipe described in the utility model also includes the lift gas pipe for being arranged on tedge side wall, described
Lift gas pipe is connected with the one end open of the metal spool of electromagnetic induction coil 5.
Preferably, the power of electromagnetic induction heating coil is set as 1000~2000KW, frequency 400~
1000HZ.Electromagnetic induction coil 5 can be connected by the wire being embedded in dip pipe refractory material with the power supply of outside.For matching
The power of electromagnetic induction coil, the electromagnetic induction coil of high inductance is designed, its specifications parameter is electromagnetic induction coil wall thickness
For 3~5mm, the number of turn is 8~12 circles, and turn-to-turn is away from for 8~12mm.
According to RH refining furnaces dip pipe described in the utility model, it is characterised in that spread in first cast bed of material 2
If cylindric wire netting 10, the bed of material is poured to first and plays fixation.The wire netting 10 can be fixed by Y shape anchoring piece
In the first cast bed of material 2, the spacing of the Y shape anchoring piece is preferably 100~150mm.
The bottom of steel courage 3 described in the utility model extend internally out a circle steel plate formed supporting steel plate 7, the supporting steel plate 7
Touched with the bottom connection of refractory brick 6, play a part of supporting magnesium chromium matter refractory brick.
According to RH refining furnaces dip pipe described in the utility model, wherein, in the body of embedment electromagnetic induction coil,
The thickness of first cast bed of material 2 is 90~120mm, and the thickness of the steel courage 3 is 10~20mm, second cast bed of material
4 thickness is 40~60mm, and the thickness of the refractory brick 6 is 130~170mm.In the body without electromagnetic induction coil, the
The thickness of two cast bed of material also includes the thickness of coil position.
Further, preferably, first cast bed of material 2 with the second cast bed of material 4 is that corundum spinel pours
Material feeding layer, the refractory brick 6 are magnesium chromium matter refractory brick, preferably insulation and resistance to material effect.
According to RH refining furnaces dip pipe described in the utility model, wherein, embedment is electric in tedge and down-comer
During magnetic induction coil, the coiling for the induction coil being embedded in tedge and down-comer is in opposite direction, to reach two coil magnetic
The effect of induction superposition.
Heating molten steel method based on RH refining furnaces dip pipe of the present utility model, comprises the following steps：
1) one end of the metal spool of electromagnetic induction coil 5 is connected with the lift gas pipe of dip pipe, by metal spool
The other end be connected with outside argon gas source；Meanwhile electromagnetic induction coil 5 is accessed into power supply；
2) electromagnetic induction coil 5 is powered, while argon gas is passed through into metal spool, argon gas is entered via metal spool
Lift gas pipe, and sprayed into by lift gas pipe in molten steel, molten steel is entered into and through from tedge under the flow direction of vacuum tank bottom
Drop pipe；Meanwhile the electromagnetic induction coil 5 after energization heats tube wall and is heated molten steel.
According to above-mentioned heating molten steel method, it is preferable that the flow velocity for being passed through argon gas is 10~15m/s.
In above-mentioned heating molten steel method, argon gas flows along metal spool (the hollow, rectangular shape passage of coil inside), argon
Sprayed into after the complete electromagnetic induction coil of air cooling from the lift gas pipe of tedge in molten steel, because tedge is constantly blown into molten steel
Argon gas, the down-comer for being relatively free of Argon generate a higher static pressure difference, molten steel is entered into and through vacuum from tedge
Groove bottom flows to down-comer, and molten steel circulates.Argon gas can play cooling electromagnetic induction coil and driving molten steel along ladle-on
The double effectses that riser-vacuum chamber-decline canal path circulates.Cooling water seepage is avoided that instead of water cooling using air cooling
The caused danger into molten steel, and argon gas can have been saved heat, reduced steel the heat transfer that cooling is taken away into molten steel
Water temperature drops.
The main distinction of the utility model and Chinese patent application CN201610027588.9 is：1st, electromagnetic induction is added
Heat coil is embedded in the inner side of dip pipe, and the structural order of dip pipe from outside to inside is：Castable-steel courage-castable-electromagnetism
Induction coil-refractory brick, because electromagnetic induction coil is embedded in the inner side of steel courage, so electromagnetic induction coil will not be heated to steel
Courage, the service life of dip pipe is not interfered with.2nd, cooled down inside induction coil using argon gas, argon gas passes through from induction coil
Spray into molten steel, compare and water cooling from the lift gas jet pipe of tedge afterwards, avoid it is dangerous caused by dipping tube leakage, and
And argon gas after being preheated in electromagnetic induction coil, temperature rise, can reduce caused molten steel after penetrating argon gas as lift gas
Temperature drop.3rd, electromagnetic induction coil power is greatly improved to 1000~2000KW, can be rapidly heated, the heating power consumption of molten steel is 0.3
~0.5KW/ DEG C of ton steel, refining furnaces more than 100 tons of steel, 10 DEG C every liter, 300~500KW is needed, is sensed using great-power electromagnetic
Coil can match the heating demand of large-tonnage refining furnace molten steel.
Specific advantage of the present utility model is as follows：
1st, electromagnetic induction coil is embedded on the inside of steel courage, and steel will not be heated to when electromagnetic induction coil heats to molten steel
Courage, the life-span of dip pipe will not be impacted.There is one layer of castable between steel courage and electromagnetic induction coil, play insulator
With the effect of resistance to material.
2nd, the power of electromagnetic induction heater is greatly improved, and devises matching electromagnetic induction coil specification ginseng
Number, calculated according to the heating power consumption of molten steel for 0.3~0.5KW/ DEG C of ton steel, using the heater of 1000~2000KW power
120 tons of molten steel can be made to be heated up 8.3~27.7 DEG C in the refining time of 30 minutes, can effectively make up the temperature in RH refining process
Degree loss.
3rd, is cooled down using argon gas in hollow, rectangular shape coil, argon gas has been cooled down after electromagnetic induction coil from tedge
Lift gas pipe spray into molten steel, argon gas can play cooling electromagnetic induction coil and drive the dual effect that circulates of molten steel
Fruit.It is avoided that cooling water leaks into caused danger in molten steel instead of water cooling using air cooling, and argon gas can take away cooling
Heat transfer into molten steel, saved heat, reduced molten steel temperature drop.
Brief description of the drawings
Fig. 1 is RH refining furnaces dip pipe body schematic diagram of the present utility model.
Fig. 2 is RH refining furnaces dip pipe body top view of the present utility model.
Reference
1st, molten steel channel 2, the first cast bed of material 3, steel courage 4, the second cast bed of material
5th, electromagnetic induction coil 6, refractory brick 7, supporting steel plate 8, flange
9th, Y shape anchoring piece 10, wire netting
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type embodiment is described in further detail.
As shown in figs. 1 and 2, the RH refining furnace dip pipes of heating molten steel of the present utility model, including tedge and decline
Pipe, wherein, electromagnetic induction coil is embedded in the tedge or down-comer, or, it is embedded in tedge and down-comer
Electromagnetic induction coil；Wherein, be embedded to the body of electromagnetic induction coil include successively from outside to inside the first cast bed of material 2, steel courage 3,
Second cast bed of material 4, electromagnetic induction coil 5 and refractory brick 6；In the body without electromagnetic induction coil, the second cast bed of material 4
Directly connect with refractory brick 6, i.e., the position of electromagnetic induction coil is filled using the castable of the second cast bed of material.
Electromagnetic induction coil 5 described in the utility model is made up of the winding of metal spool, and the metal wire tube section is hollow
Rectangle, the metal wire tube section specification are (50~70) mm × (20~40) mm.RH refining furnaces leaching described in the utility model
Stain pipe also includes the lift gas pipe for being arranged on tedge side wall, the metal wire of the lift gas pipe and electromagnetic induction coil 5
The one end open of pipe is connected.The electromagnetic induction coil of high inductance is designed, its specifications parameter is, electromagnetic induction coil wall thickness is 3~
5mm, the number of turn are 8~12 circles, and turn-to-turn is away from for 8~12mm.
The cylindric wire netting 10 of laying in first cast bed of material 2, the bed of material is poured to first and plays fixation.It is described
Wire netting 10 can be fixed on by Y shape anchoring piece in the first cast bed of material 2, and the spacing of the Y shape anchoring piece is preferably 100~
150mm.The bottom of the steel courage 3 circle steel plate that extends internally out forms supporting steel plate 7, the supporting steel plate 7 and the bottom of refractory brick 6
It is in contact, plays a part of supporting magnesium chromium matter refractory brick.
According to RH refining furnaces dip pipe described in the utility model, wherein, in the body of embedment electromagnetic induction coil,
The thickness of first cast bed of material 2 is 90~120mm, and the thickness of the steel courage 3 is 10~20mm, second cast bed of material
4 thickness is 40~60mm, and the thickness of the refractory brick 6 is 130~170mm.In the body without electromagnetic induction coil, the
The thickness of two cast bed of material also includes the thickness of coil position.Preferably, the cast bed of material of the first cast bed of material 2 and second
4 be corundum spinel cast bed of material, and the refractory brick 6 is magnesium chromium matter refractory brick.
After dip pipe processes and toasts drying, dip pipe and RH vacuum chambers are connected by flange 8, pass through the coal that burns
Dip pipe is preheated to 400~500 DEG C, after ladle is transported into RH stations by gas, is sampled thermometric work, is then fallen dip pipe,
Vacuum chamber and from lift gas pipe into molten steel blowing argon gas, and calculate according to temperature measurement data the heating value of needs, press
According to molten steel heating 0.3~0.5KW/ DEG C of ton steel of power consumption calculate for molten steel heating need power consumption, open electromagnetic induction and add
The power supply of thermal, molten steel is heated using electromagnetic induction heating coil.After molten steel reaches target temperature, electromagnetism sense is closed
Answer the power supply of heater, after liquid steel refining, raise RH refining furnace dip pipes, the cooling gas in electromagnetic induction coil is cut
Nitrogen is shifted to, continues to cool down 10~20min to electromagnetic induction coil.After dip pipe reaches service life, dip pipe is offline, will soak
Electromagnetic induction coil in stain pipe is embedded in new dip pipe after removing maintenance.
Embodiment 1
Electromagnetic induction coil 5 is embedded in the dip pipe, the structural order of dip pipe radially from outside to inside is：First pours
Material feeding layer 2 (corundum spinel)-(corundum spinel)-electromagnetic induction coil 5- of the second cast bed of material of steel courage 3- 4 is resistance to
Firebrick 6 (magnesium chromium matter), the bottom of steel courage 3 extend outward a circle supporting steel plate 7, play a part of supporting refractory brick 6, are poured first
The wire netting 10 of cylindrical shape is laid in material feeding layer 2, the bed of material is poured to first and plays fixation, and is fixed with Y shape anchoring piece 9, Y shape
Anchoring piece 9 is welded on the outer wall of steel courage 3, and the spacing of Y shape anchoring piece 9 is 100mm.The thickness of first cast bed of material 2 is 90, steel
The thickness of courage 3 is 10mm, and the thickness of the second cast bed of material 4 is 40mm, and the thickness of electromagnetic induction coil 5 is 20mm, electromagnetic induction line
The turn-to-turn of circle 5 is tamped with corundum spinel castable, and the thickness of refractory brick 6 is 130mm, dipping bore 400mm.Electromagnetic induction
Coil 5 is embedded in the inner side of steel courage 3, and steel courage 3 will not be heated to when electromagnetic induction coil 5 heats to molten steel, will not be to dipping
The life-span of pipe impacts.There is one layer of second castable 4 between steel courage 3 and electromagnetic induction coil 5, play insulator and resistance to material
Effect.
The power of electromagnetic induction heating coil 5 is set as 1000KW, frequency 1000HZ, and electromagnetic induction coil 5 passes through
The connection of the wire and external power source that are embedded in dip pipe refractory material.To match the power of electromagnetic induction coil 5, design
The electromagnetic induction coil of high inductance, its specifications parameter be, coil is the copper coil of hollow, rectangular, oil wall thickness 3mm, rectangular lines
Ring cross-section specification is 50mm*20mm, and the number of turn is 8 circles, and turn-to-turn is away from for 8mm.Using insulating carriage Motionless electromagnetic induction coil, and
And insulating carriage is connected and fixed with steel courage 3.
The copper electromagnetic induction coil 5 of hollow, rectangular shape is cooled down using argon gas, and electromagnetic induction coil 5 is by being embedded in leaching
Tracheae in stain pipe refractory material is connected with outside argon gas source, lift gas blowpipe.Hollow, rectangular shape of the argon gas along coil inside
Passage flows, gas flow rate 10m/s, and argon gas cool down after electromagnetic induction coil 5 into the lift gas pipe of tedge, from carrying
Rise gas official to be blown into molten steel, because tedge is constantly blown into argon gas to molten steel, the down-comer for being relatively free of Argon generates one
Individual higher static pressure difference, molten steel is entered into and through vacuum tank bottom from tedge and flow to down-comer, molten steel circulates.Argon gas
Cooling electromagnetic induction coil 5 can be played and driving molten steel circulates along ladle-tedge-vacuum chamber-decline canal path
Double effectses.It is avoided that cooling water leaks into caused danger in molten steel instead of water cooling using air cooling, and argon gas can be band
The heat transfer walked has saved heat into molten steel, reduces molten steel temperature drop.
Induction coil 5 can be all buried in rising and pipe down-comer, also only can bury the line of induction in tedge or down-comer
Circle 5, if the induction coil 5 on tedge and down-comer all bury, its coiling side of induction coil 5 for being buried in tedge and down-comer
To on the contrary, to reach the effect of two coil magnetic induction intensity superpositions.
After dip pipe processes and toasts drying, dip pipe and RH vacuum chambers are connected by flange 8, pass through the coal that burns
Dip pipe is preheated to 400 DEG C, after ladle is transported into RH stations by gas, is sampled thermometric work, is then fallen dip pipe, vacuum chamber
Vacuumize and be blown into pipe blowing argon gas into molten steel from lift gas, and the heating value of needs is calculated according to temperature measurement data, according to
Heating 0.3~0.5KW/ DEG C of ton steel of power consumption of molten steel calculates the power consumption needed for molten steel heating, opens electromagnetic induction heating
The power supply of device, molten steel is heated using electromagnetic induction heating coil.After molten steel reaches target temperature, electromagnetic induction is closed
The power supply of heater, after liquid steel refining, raise RH refining furnace dip pipes, the cooling gas switching in electromagnetic induction coil
To nitrogen, continue to cool down 10min to electromagnetic induction coil.After dip pipe reaches service life, dip pipe is offline, by dip pipe
Electromagnetic induction coil remove maintenance after be embedded in new dip pipe.
Production practices show, after the RH refining furnace dip pipes described in the utility model for heating molten steel, dip pipe
Life-span does not change, and the electromagnetic induction device being embedded in dip pipe can meet the heating demand of RH refining furnace molten steel substantially,
Substantially Burning Aluminium is not needed to be heated up, Molten Steel Cleanliness significantly improves, and inclusion content of casting blank reduces more than 15%.
Embodiment 2
Electromagnetic induction coil 5 is embedded in the dip pipe, the structural order of dip pipe radially from outside to inside is：First pours
Material feeding layer 2 (corundum spinel)-(corundum spinel)-electromagnetic induction coil 5- of the second cast bed of material of steel courage 3- 4 is resistance to
Firebrick 6 (magnesium chromium matter), the bottom of steel courage 3 extend outward a circle steel plate 7, play a part of supporting magnesium chromium matter refractory brick 6, first
The wire netting 10 of cylindrical shape is laid in cast bed of material 2, the bed of material is poured to first and plays fixation, and is fixed with Y shape anchoring piece 9, Y
Shape anchoring piece 9 is welded on the outer wall of steel courage 3, and the spacing of Y shape anchoring piece 9 is 150mm.The thickness of first cast bed of material 2 is
120mm, the thickness of steel courage 3 is 20mm, and the thickness of the second cast bed of material 4 is 60mm, and the thickness of electromagnetic induction coil 5 is 40mm,
The turn-to-turn of electromagnetic induction coil 5 is tamped with corundum spinel castable, and the thickness of magnesium chromium matter refractory brick 6 is 170mm, in dip pipe
Footpath is 600mm.Electromagnetic induction coil 5 is embedded in the inner side of steel courage 3, will not be heated when electromagnetic induction coil 5 heats to molten steel
To steel courage 3, the life-span of dip pipe will not be impacted.There is one layer of second castable between steel courage 3 and electromagnetic induction coil 5
Layer 4, plays a part of insulator and resistance to material.
The power of electromagnetic induction heating coil 5 is set as 2000KW, and frequency 400HZ, electromagnetic induction coil is by burying
The connection of wire and external power source in dip pipe refractory material.To match the power of electromagnetic induction coil 5, design is high
The electromagnetic induction coil of inductance, its specifications parameter be, coil is the copper coil of hollow, rectangular, oil wall thickness 5mm, square coil
Section specification is 70mm*40mm, and the number of turn is 12 circles, and turn-to-turn is away from for 12mm.Using insulating carriage Motionless electromagnetic induction coil, and
And insulating carriage is connected and fixed with steel courage 3,
The copper electromagnetic induction coil 5 of hollow, rectangular shape is cooled down using argon gas, and electromagnetic induction coil 5 is by being embedded in leaching
Tracheae in stain pipe refractory material is connected with outside argon gas source, lift gas blowpipe.Hollow, rectangular shape of the argon gas along coil inside
Passage flows, gas flow rate 15m/s, and argon gas has cooled down and has been blown into steel from the lift gas pipe of tedge after electromagnetic induction coil 5
In water, because tedge is constantly blown into argon gas to molten steel, the down-comer for being relatively free of Argon generates a higher static pressure difference,
Molten steel is entered into and through vacuum tank bottom from tedge and flow to down-comer, molten steel circulates.Argon gas can play cooling electromagnetism
The double effectses that induction coil 5 and driving molten steel circulate along ladle-tedge-vacuum chamber-decline canal path.Using
It is gas-cooled to replace water cooling to be avoided that cooling water leaks into caused danger in molten steel, and argon gas can arrive the heat transfer taken away
In molten steel, heat has been saved, has reduced molten steel temperature drop.
Induction coil 5 can be all buried in rising and pipe down-comer, also only can bury the line of induction in tedge or down-comer
Circle 5, if the induction coil 5 on tedge and down-comer all bury, its coiling side of induction coil 5 for being buried in tedge and down-comer
To on the contrary, to reach the effect of two coil magnetic induction intensity superpositions.
After dip pipe processes and toasts drying, dip pipe and RH vacuum chambers are connected by flange 8, pass through the coal that burns
Dip pipe is preheated to 500 DEG C, after ladle is transported into RH stations by gas, is sampled thermometric work, is then fallen dip pipe, vacuum chamber
Vacuumize and be blown into pipe blowing argon gas into molten steel from lift gas, and the heating value of needs is calculated according to temperature measurement data, according to
Heating 0.3~0.5KW/ DEG C of ton steel of power consumption of molten steel calculates the power consumption needed for molten steel heating, opens electromagnetic induction heating
The power supply of device, molten steel is heated using electromagnetic induction heating coil.After molten steel reaches target temperature, electromagnetic induction is closed
The power supply of heater, after liquid steel refining, raise RH refining furnace dip pipes, the cooling gas switching in electromagnetic induction coil
To nitrogen, continue to cool down 20min to electromagnetic induction coil.After dip pipe reaches service life, dip pipe is offline, by dip pipe
Electromagnetic induction coil remove maintenance after be embedded in new dip pipe.
Production practices show, after the RH refining furnace dip pipes described in the utility model for heating molten steel, dip pipe
Life-span does not change, and the electromagnetic induction device being embedded in dip pipe can meet the heating demand of RH refining furnace molten steel substantially,
Substantially Burning Aluminium is not needed to be heated up, Molten Steel Cleanliness significantly improves, and inclusion content of casting blank reduces more than 20%.
Certainly, the utility model can also have various embodiments, in the feelings without departing substantially from the utility model spirit and its essence
Under condition, those skilled in the art can make various corresponding changes and modification, but this according to disclosure of the present utility model
A little corresponding changes and deformation should all belong to the scope of the claims appended by the utility model.
Claims (10)
1. a kind of RH refining furnace dip pipes for heating molten steel, including tedge and down-comer, it is characterised in that in the rising
Embedment electromagnetic induction coil in pipe or down-comer, or, it is embedded to electromagnetic induction coil in tedge and down-comer；Wherein,
Be embedded to the body of electromagnetic induction coil includes the first cast bed of material (2), steel courage (3), the second castable successively from outside to inside
Layer (4), electromagnetic induction coil (5) and refractory brick (6)；
In the body without electromagnetic induction coil, the second cast bed of material (4) directly connects with refractory brick (6).
2. RH refining furnaces dip pipe according to claim 1, it is characterised in that the gold of the electromagnetic induction coil (5)
It is hollow, rectangular to belong to spool section, and the metal wire tube section specification is (50~70) mm × (20~40) mm.
3. RH refining furnaces dip pipe according to claim 2, it is characterised in that the RH refining furnaces are also wrapped with dip pipe
Include the lift gas pipe for being arranged on tedge side wall, the lift gas pipe and the one of the metal spool of electromagnetic induction coil (5)
End opening is connected.
4. RH refining furnaces dip pipe according to claim 1 or 2, it is characterised in that the electromagnetic induction coil wall thickness
For 3~5mm, the number of turn is 8~12 circles, and turn-to-turn is away from for 8~12mm.
5. RH refining furnaces dip pipe according to claim 1 or 2, it is characterised in that in first cast bed of material (2)
Lay cylindric wire netting (10).
6. RH refining furnaces dip pipe according to claim 5, it is characterised in that the wire netting (10) passes through Y shape anchor
Firmware is fixed in the first cast bed of material (2), and the spacing of the Y shape anchoring piece is 100~150mm.
7. RH refining furnaces dip pipe according to claim 1 or 2, it is characterised in that inwardly prolong steel courage (3) bottom
Stretch out a circle steel plate and form supporting steel plate (7), the supporting steel plate (7) is touched with refractory brick (6) bottom connection.
8. RH refining furnaces dip pipe according to claim 1 or 2, it is characterised in that in embedment electromagnetic induction coil
In body, the thickness of first cast bed of material (2) is 90~120mm, and the thickness of the steel courage (3) is 10~20mm, described
The thickness of second cast bed of material (4) is 40~60mm, and the thickness of the refractory brick (6) is 130~170mm.
9. RH refining furnaces dip pipe according to claim 1 or 2, it is characterised in that first cast bed of material (2) with
Second cast bed of material (4) is corundum spinel cast bed of material, and the refractory brick (6) is magnesium chromium matter refractory brick.
10. RH refining furnaces dip pipe according to claim 1 or 2, it is characterised in that in tedge and down-comer
Electromagnetic induction coil is embedded to, also, the coiling for the induction coil being embedded in tedge and down-comer is in opposite direction.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929636A (en) * | 2017-04-05 | 2017-07-07 | 山东钢铁股份有限公司 | A kind of RH refining furnaces dip pipe for heating molten steel and heating molten steel method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929636A (en) * | 2017-04-05 | 2017-07-07 | 山东钢铁股份有限公司 | A kind of RH refining furnaces dip pipe for heating molten steel and heating molten steel method |
| CN106929636B (en) * | 2017-04-05 | 2019-08-20 | 山东钢铁股份有限公司 | A kind of the RH refining furnace dip pipe and heating molten steel method of heating molten steel |
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