CN106001528B - Continuous casting tundish direct-current plasma heating device using a plurality of graphite hollow bars as electrodes - Google Patents
Continuous casting tundish direct-current plasma heating device using a plurality of graphite hollow bars as electrodes Download PDFInfo
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- CN106001528B CN106001528B CN201610552619.2A CN201610552619A CN106001528B CN 106001528 B CN106001528 B CN 106001528B CN 201610552619 A CN201610552619 A CN 201610552619A CN 106001528 B CN106001528 B CN 106001528B
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- 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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
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Abstract
The invention provides a continuous casting tundish molten steel direct-current plasma heating method and device using a plurality of graphite hollow electrodes, which are suitable for heating systems in industrial production. A hollow graphite electrode plasma heating technology can be used for a molten iron pretreatment, ladle refining and continuous casting tundish plasma heating device. The method and the device can reasonably control the temperature of molten steel in a tundish, compensate temperature fluctuation and stabilize casting operation, so that the production rate of a continuous casting machine is greatly increased. By mounting the heating device for compensating the heat of the molten steel in the tundish, the temperature of the molten steel of the tundish can be greatly lowered, constant low-temperature casting is realized, non-metal inclusions and central segregation in continuous casting blanks can be reduced, submerged nozzle blockage is prevented, the quality of the casting blanks is improved, the yield rate is improved, and casting operation is stable. By heating the molten steel of the tundish, the tapping temperature of a steel smelting furnace can be lowered, and the refractory and energy fees of a steel smelting technology can be reduced. The hollow graphite electrode plasma heating technology plays an important role in helping China metallurgical industry take a quality-benefit road.
Description
Technical field
The invention belongs to science and technology and industrial technical field, and in particular to a kind of company that electrode is made of many graphite hollow sticks
Casting tundish direct current plasma heater and method.
Background technology
Plasma is by a large amount of free electrons and ion and on a small quantity unionized gas molecule and atom are constituted.Reach one
Fixed degree of ionization (＞ 10-4), gas is in conduction state, because ionized gas global behavior shows electroneutral, that is, electricity
Positive and negative charge number is equal in gas, and this gaseous state is called plasma state.Heating plasma technology be by wait from
Apply certain electric energy generation arc light on electronic generator to be adequately ionized gas medium, make plasma energy high concentration to carry out
Heating.Can be divided into high-temperature plasma and the class of low temperature plasma two by temperature.
To the latter stage eighties, metallargist starts the focus to be transferred to liquid molten steel and becomes the last of solid strand
One container-- tundish.Temperature problem is the key factor for affecting steel process of setting quality, cost and productivity ratio, so as to add
Heat and control molten steel in bakie in continuous casting temperature techniques start to be applied to production, and achieve good effect.Tundish application etc.
Molten steel temperature declines when Ion Heating technology can prevent from changing bag.Iso ionic Heating of Tundish can be with molten steel in wrapping between quick centring
Carry out heating compensation, control tundish temperature wave amplitude, realize that constant speed is cast, it is ensured that slab quality, reduce pulling rate change and may
The defect brought and accident.Open per stove steel in conticaster production process and pour and cast latter stage, general liquid steel temperature is all low, and
And the temperature of every stove molten steel is discrepant during sequence casting, molten steel temperature in tundish is difficult control in the case of without thermal compensation
System can just make trough casting temperature in target temperature value or so using Iso ionic Heating of Tundish, can control in mesh
In the range of ± 2 DEG C of mark temperature, the purpose of constant speed casting is reached；Tundish can reduce tapping temperature using heating plasma technology
15-40 DEG C or so of degree, improves molten steel recovery rate, can improve conticaster specific yield.In order to ensure high-quality strand, especially for
Reduction center segregation and non-metallic inclusion, it is necessary to which molten steel temperature is maintained in the range of optimal cast temperature.
Be applied to Tundish Heating system at present mainly has two kinds of major ways of sensing heating and heating plasma, sensing
Heating needs outside coolant to be lowered the temperature to induction coil so many heats, and induction heating mode can be taken away to centre
Bag transformation amount is also larger.Have been used for industrial heating plasma system practice have shown that：The thermal efficiency of heating plasma is
60%-70%, the indirec radiation heat from heating chamber refractory material wall accounts for therein more than 50%.Plasma gun be occur etc. from
One of key equipment of daughter.
Plasma spraying gun is divided into metal plasma rifle and nonmetallic plasma gun again by material, and metal plasma rifle is in order to protect
Armed body normal work, needs article on plasma gun body to carry out water-cooled cooling, and water-cooling system can take away partial heat, simultaneously because work
Plasma gun will be entered and heated in tundish when making, so do not allow plasma spraying gun that leak occurs, once there is leak
Will explode with the molten steel of high temperature, so metal plasma rifle generally existing complex structure, service life is short, high cost
Shortcoming.
The content of the invention
For effectively solving the problems referred to above, the continuous casting production that a kind of many graphite hollow sticks of present invention offer do electrode is straight
Stream plasma heating device and method.
Concrete technical scheme is as follows：A kind of many graphite hollow sticks do the continuous casting production direct current plasma plus hot charging of electrode
Put, the heater includes heating plasma unit, front end measuring unit and control assembly；
Front end measuring unit measurement in real time adds the molten steel height and molten steel temperature of heat space, and feeds back to the control
Component, the control assembly is adjusted heating plasma unit according to feedback information.
Further, there is a Controlling model, the Controlling model is by molten steel temperature, molten steel face in the control assembly
Temperature at 0-12cm is input in Controlling model as input quantity, and Controlling model output plasma gas is passed through flow
And the electrical current size of heating plasma unit, realize automatically controlling for article on plasma heating unit.
Further, the front end measuring unit is a continuous thermometering device, and the continuous thermometering device includes multiple surveys
Warm unit, the temperature measuring unit is arranged in tundish molten steel or is arranged on tundish inwall.
Further, the control assembly includes a plasma power supply system, moisture control device, field operation box, electricity
Pole adjustment switch board, operating desk, control cabinet；
The both positive and negative polarity of one end of the plasma electric origin system connects heating plasma unit by dc bus, described etc.
The other end connection control cabinet of ion power supply system, the moisture control device, field operation box, electrode adjustment switch board and behaviour
Make platform while connecting the control cabinet.
Further, the heater also includes a mechanical arm, and the heating plasma unit is a plasma gun, and
The plasma gun is fixed on the robotic arm；The electrode adjustment switch board connects the mechanical arm.
Further, the plasma gun is a hollow pipe shape, and the hollow tube outside dimension is Φ 50-150mm, long
Spend for 500-1500mm, diameter of bore is 1-10mm；
Under in working order, plasma working air current is filled with the hollow graphite pipe, the plasma working air current will
The arc transfer for having produced forms work arc between rifle and molten steel.
Further, the plasma electric origin system includes an isolating transformer and many pulse wave controlled rectification loops, institute
State transformer to be isolated high pressure and low pressure, while high-tension electric current is converted into into low-voltage and high-current, and by many arteries and veins
Ripple controlled rectification loop and control loop convert alternating current to low-voltage direct output.
Beneficial effects of the present invention are：The hollow graphite electrode that the present invention is adopted is hollow electrode (general graphite electrode
All it is solid), it is that hollow tubular shape is directly compressed in electrode moulding to produce this product, later production process
Identical with the production of solid electrode, coreless armature can save raw material.The passage that the hollow area of electrode can be utilized to be formed,
Plasma gas is passed through in the hollow space of graphite electrode, graphite electrode cooling is given, its service life is extended, because not adopting
With water-cooling pattern so security is very high.The plasma gas being passed through simultaneously also has stabilized plasma electric arc, and to steel
The effect of the stirring of liquid.Because two hollow graphite electrode plasma guns and slag molten steel can directly constitute electric loop
Need not in tundish pre-buried hearth electrode, rebuilding construction is simple and convenient.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the present invention using single negative electrode and bianode 3 hollow graphite electrode heating arrangement schematic diagram.
Fig. 3 is the present invention using twin cathode and bianode 4 hollow graphite electrode heating arrangement schematic diagram.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is only used for explaining the present invention, not
For limiting the present invention.
Conversely, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiies
Change, equivalent method and scheme.Further, in order that the public has a better understanding to the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.
As shown in figure 1, providing a kind of continuous casting production direct current that electrode is made of many graphite hollow sticks for the embodiment of the present invention
Plasma heating device, described device includes plasma electric origin system 1, moisture control device 2, the adjustment of field operation box 3, electrode
Switch board 4, operating desk 5, control cabinet 6, plasma gun mechanical arm 7, plasma gun 8, dc bus 9, molten steel liquid level emasuring device
10th, continuous thermometering device 11；
The both positive and negative polarity of one end of the plasma electric origin system 1 connects two by two or more dc bus 9 respectively
Or multiple plasma guns 8, the other end connection control cabinet 6 of the plasma electric origin system 1, the moisture control device 2, scene
Control box 3, electrode adjusts switch board 4 and operating desk 5 connects the control cabinet 6 simultaneously, and the moisture control device 2 is simultaneously
Connection plasma gun 8, the electrode adjustment switch board 4 connects the plasma gun mechanical arm 7 simultaneously, and the plasma gun 8 is consolidated
It is scheduled on the plasma gun mechanical arm 7.In other embodiments, can be using 1-4 plasma gun 8.
Plasma electric origin system 1, the plasma electric origin system 1 includes an isolating transformer and many pulse wave controlled rectifications
Loop, the transformer is isolated high pressure and low pressure, while high-tension electric current is converted into meet technological requirement
Low-voltage and high-current, and convert alternating current to low-voltage direct output by many pulse wave controlled rectification loops and control loop；
Moisture control device 2, the moisture control device includes a chilled water unit and a feeder, the cooling water
Device is a high-pressure cooling water generating means, and the chilled water unit provides normal to water-cooled cable, transformer and controllable silicon
The cooling water of pressure, flow, quality and temperature, the feeder provides the working gas of certain pressure flow, the work
Gas is nitrogen and/or argon gas etc., and is automatically adjusted manually according to actual condition；
Scene manipulation case 3, supplement of the field control case 3 to consing function, the control of the rifle of anode and cathode two and
Display is concentrated in a case, and the left rotation and right rotation, lifting action to mechanical arm is controlled, for the control signal to mechanical arm
Switch board 4 is adjusted by control cabinet 6 and motor to be sent on plasma mechanical arm 7, realize the control of article on plasma mechanical arm 7；
Electrode adjusts switch board 4, and the electrode adjustment switch board 4 is realized directly needing plasma gun mechanical arm 7
Control signal is transmitted.
Operating desk 5, the operating desk includes arc current table, arc voltage table, various operation button indicator lamps, and for counting
According to the computer system of record statistics；
Comprising PLC and I/O module relay terminal blocks for being used to automatically control etc. in control cabinet 6, the control cabinet, it is responsible for
The digital quantity and analog signalses at scene are acquired isolation campaign and are controlled；
Plasma gun mechanical arm 7, for controlling the motion of plasma gun 8；
Plasma gun 8, the plasma gun 8 is hollow graphite electrode structure；The plasma gun 8 is a hollow tubular
Shape, the hollow tube outside dimension is Φ 50-150mm, and length is 500-1500mm, and diameter of bore is 1-10mm；
In another embodiment hollow tube outside dimension described in the plasma gun 8 is Φ 60mm, and length is 750mm, interior
Bore dia is 8mm, and arc current intensity is：1-8kA, arc voltage is 100-400V, controlled current flow, voltage and rifle position and atmosphere
Relation be：Rifle position is high, then voltage is high；Contain polyatomic gas in atmosphere, voltage is also high.
Under in working order, plasma working air current is filled with the hollow tube, the plasma working air current is by
The arc transfer of generation forms work arc between rifle and molten steel.
The heating technique of plasma gun 8 that the present invention is applied, is capable of achieving advantages below：
1st, in casting cycle, tundish molten steel temperature can be strict controlled within ± 2 DEG C, and acquisition is improved quality in length
Even continuous casting billet always；
2nd, tapping temperature can be reduced, tapping temperature reduces 20-40 DEG C, so as to energy-conservation, and reduces refractory consumption rate；
3rd, low overtemperature casting is capable of achieving, shortens casting time, (casting blank inner organization is in equiax crystal to improve billet quality
Structure), reduce subsurface inclusion thing；
4th, working gas is made using mixed gas (nitrogen and/or argon gas), to molten steel without any pollution, can also be on molten steel
Protective atmosphere is formed, the secondary oxidation of molten steel in pans is effectively eliminated；This is particularly important when aluminum killed steel is poured into a mould, together
When can also reduce nitrogen partial pressure in pans, correspondingly reduce the nitrogen content in steel.
5th, ferroalloy can be added in pans, molten steel component is finely tuned, yield of alloy is maximally improved；
6th, the on-line operation of pans molten steel heating category, does not additionally increase the production time.
7. the consumption of graphite electrode is 0.46kg/h, i.e. 0.03kg/t steel.
8. whole heating process molten steel recarburization is no more than 10ppm between 0-0.05ppm.
9. the work arc heating for being formed using plasma has power utilization rate high, the harmful wave spectrum of electrical network is reduced, electric arc
Stable, during the multi-electrode starting the arc, each electrode is all capable of achieving transferred arc work, and the thermal efficiency is high.
10. the angle between plasma gun is adjusted by mechanical arm, angular range is between 90 ° -270 °, to make plasma gun
Attract each other between the electric arc of formation, increase arc stability, the thermal efficiency is improved.
In another embodiment of the present invention,
Dc bus 9, dc source is connected with hollow graphite electrode, direct current energy is provided and is transported to plasma
Rifle；
Molten steel liquid level emasuring device 10, for measuring the height of the molten steel in tundish, and carries out heating power according to molten steel
Automatically adjust；
Continuous thermometering device 11, continuous temperature measurement system continuously detects molten steel temperature in tundish, supporting with PLC system, even
The actual effect of continuous reflection heating plasma, while also have participating in the function that plasma gun power is automatically controlled, automatically controls
Precision is ± 2 DEG C of target temperature, and manual precision is target temperature ± 5 DEG C.
One embodiment of the present of invention provides a Controlling model, and the Controlling model is by molten steel height, molten steel temperature, molten steel
Temperature on face at 0-12cm is calculated as input quantity, and export plasma gas be passed through flow and heating plasma list
The electrical current size of unit, realizes automatically controlling for article on plasma heating unit.
Specially described continuous thermometering device 11 includes multiple temperature measuring units, and the temperature measuring unit is arranged on middle Baogang
Liquid is interior or is arranged on tundish inwall,.Specifically one can be arranged every 5-8cm in molten steel endosexine face center from top to bottom
Temperature measuring unit, the non-central place in the molten steel is also equipped with temperature measuring unit, and the temperature measuring unit is uniformly arranged in molten steel, and
It is in the same level of the temperature measuring unit of center, while the temperature being acquired in molten steel, and Real-time Feedback is to master
Control cabinet 6, the continuous thermometering device 11 is additionally included in the temperature measuring unit on the molten steel face at 10-12cm, according to temperature measuring unit
The temperature of feedback, adjusts plasma gun mechanical arm so that the point that the heating pointing needle of plasma gun is low to temperature is heated.
The temperature measured by the temperature measuring unit inside molten steel is respectively T1、T2、T3、T4、T5......Tn, it is described flat
Temperature isThe variance of the temperature isIn s2When more than 30, tundish is judged
The temperature of molten steel is unstable, and starts control plasma gun and heated, and controls the electric current of the plasma gun in 2000-
2400A, the intake for controlling the plasma working air current is controlled 2 × 10-2m3/s-2.3×10-2m3/s；In s2More than 60
When, the electric current of the plasma gun is controlled in 2400-3000A, control the intake control of the plasma working air current
4 × 10-2m3/s-5×10-2m3/s；In s2When more than 100, the electric current of the plasma gun is controlled in 3000-4000A,
The intake for controlling the plasma working air current is controlled 8 × 10-2m3/s-10×10-2m3/ s, 2 plasma guns of control it
Between angle be 90 °.The application controls the heating arc length of plasma gun, the heating arc length that the application is applied by increasing electric current
In the critical value of arc length, and the arc length and the relation formula of electric current are L=0.2141 × I0.8887；Therefore by improving electricity
Stream, increased arc length, arc length obtain it is elongated after, realize heating so that the temperature of tundish molten steel increases and stablizes, while passing through
The control of mechanical arm is for the relatively low autotelic increase in direction of temperature, it is ensured that the efficiency for heating.
Arc length critical value set forth above is LFace=1.2578 × I0.6920；
In another embodiment of the invention, by temperature T at 0-12cm on the molten steel faceOutwardSimultaneously as input quantity,
The temperature of molten steel is affected in view of ambient temperature, and calculates the mean temperature beThe variance of the temperature isIn s2When more than 50, tundish is judged
The temperature of molten steel is unstable, and starts control plasma gun and heated, and controls the electric current of the plasma gun in 2000-
2400A, the intake for controlling the plasma working air current is controlled 2 × 10-2m3/s-2.3×10-2m3/s；In s2More than 90
When, the electric current of the plasma gun is controlled in 2400-3000A, control the intake control of the plasma working air current
4 × 10-2m3/s-5×10-2m3/s；In s2When more than 140, the electric current of the plasma gun is controlled in 3000-4000A,
The intake for controlling the plasma working air current is controlled 8 × 10-2m3/s-10×10-2m3/s.The application is by increasing electric current
To control the heating arc length of plasma gun, the heating arc length that the application is applied in the critical value of arc length, and the arc length with
The relation formula of electric current is L=0.2141 × I0.8887；Therefore by improving electric current, increased arc length, arc length obtain it is elongated after,
Heating is realized so that the temperature of tundish molten steel increases and stablizes, while by the control of mechanical arm for the relatively low side of temperature
To autotelic increase, it is ensured that the efficiency for heating.
In another embodiment of the present invention, the present invention is heated using single negative electrode and bianode 3 hollow graphite electrode,
As shown in Fig. 2 by temperature T at 10-12cm on the molten steel faceOutwardSimultaneously as input quantity, it is contemplated that ambient temperature is to molten steel
Temperature affect, and calculate the mean temperature and beThe temperature
Variance beIn s2When more than 50, sentence
The temperature of disconnected tundish molten steel is unstable, and starts control plasma gun and heated, and the electric current for controlling the plasma gun exists
2000-2400A, the intake for controlling the plasma working air current is controlled 2 × 10-2m3/s-2.3×10-2m3/s；In s2Greatly
When 90, the electric current of the plasma gun is controlled in 2400-3000A, control the intake of the plasma working air current
Control is 4 × 10-2m3/s-5×10-2m3/s；In s2When more than 140, the electric current of the plasma gun is controlled in 3000-
4000A, the intake for controlling the plasma working air current is controlled 8 × 10-2m3/s-10×10-2m3/s.The application is by increasing
Plus electric current, controlling the heating arc length of plasma gun, the heating arc length that the application is applied is in the critical value of arc length and described
Arc length is L=0.2141 × I with the relation formula of electric current0.8887；Therefore by improving electric current, arc length is increased, arc length is become
After length, heating is realized so that the temperature of tundish molten steel increases and stablizes, while relatively low for temperature by the control of mechanical arm
The autotelic increase in direction, it is ensured that the efficiency for heating.
In another embodiment of the present invention, the present invention is heated using twin cathode and bianode 4 hollow graphite electrode,
As shown in figure 3, by temperature T at 10-12cm on the molten steel faceOutwardSimultaneously as input quantity, it is contemplated that ambient temperature is to molten steel
Temperature affect, and calculate the mean temperature and beThe temperature
Variance beIn s2When more than 50, sentence
The temperature of disconnected tundish molten steel is unstable, and starts control plasma gun and heated, and the electric current for controlling the plasma gun exists
2000-2400A, the intake for controlling the plasma working air current is controlled 2 × 10-2m3/s-2.3×10-2m3/s；In s2Greatly
When 90, the electric current of the plasma gun is controlled in 2400-3000A, control the intake of the plasma working air current
Control is 4 × 10-2m3/s-5×10-2m3/s；In s2When more than 140, the electric current of the plasma gun is controlled in 3000-
4000A, the intake for controlling the plasma working air current is controlled 8 × 10-2m3/s-10×10-2m3/s.The application is by increasing
Plus electric current, controlling the heating arc length of plasma gun, the heating arc length that the application is applied is in the critical value of arc length and described
Arc length is L=0.2141 × I with the relation formula of electric current0.8887；Therefore by improving electric current, arc length is increased, arc length is become
After length, heating is realized so that the temperature of tundish molten steel increases and stablizes, while relatively low for temperature by the control of mechanical arm
The autotelic increase in direction, it is ensured that the efficiency for heating.
Claims (5)
1. a kind of many graphite hollow sticks make the continuous casting production direct current plasma heater of electrode, it is characterised in that described
Heater includes heating plasma unit, front end measuring unit and control assembly；In real time measurement adds the front end measuring unit
The molten steel height of heat space and molten steel temperature, and the control assembly is fed back to, the control assembly is carried out according to feedback information
Adjust heating plasma unit；
There is a Controlling model, the Controlling model is by the temperature at 0-12cm on molten steel temperature, molten steel face in the control assembly
Degree is input in Controlling model as input quantity, and Controlling model output plasma gas is passed through flow and heating plasma
The electrical current size of unit, realizes automatically controlling for article on plasma heating unit；
The front end measuring unit is a continuous thermometering device, and the continuous thermometering device includes multiple temperature measuring units, the survey
Warm unit is arranged in tundish molten steel or is arranged on tundish inwall；The temperature measuring unit is arranged on table in molten steel
Aspect center from top to bottom, every 5-8cm a temperature measuring unit is arranged, and the non-central place in the molten steel is also equipped with thermometric list
Unit, the temperature measuring unit at non-central place is uniformly arranged in molten steel, and is in the same level of the temperature measuring unit of center
On face；
The temperature measured by the temperature measuring unit inside molten steel is respectively T1、T2、T3、T4、T5.....Tn, the mean temperature
For, the variance of the temperature is, in s2When more than 30, middle Baogang is judged
The temperature of liquid is unstable, and starts control plasma gun and heated, and controls the electric current of the plasma gun in 2000-2400A,
The intake for controlling the plasma working air current is controlled 2 × 10-2m3/s-2.3×10-2m3/s；In s2When more than 60,
The electric current of the plasma gun is controlled in 2400-3000A, the intake for controlling the plasma working air current is controlled 4 × 10- 2m3/s-5×10-2m3/s；In s2When more than 100, the electric current of the plasma gun is controlled in 3000-4000A, control is described
The intake of plasma working air current is controlled 8 × 10-2m3/s-10×10-2m3/ s, the heating arc of the heating plasma unit
Length is in the critical value of arc length, and the arc length and the relation formula of electric current are L=0.2141 × I0.8887；
In casting cycle, tundish molten steel temperature is strict controlled within ± 2 DEG C.
2. continuous casting production direct current plasma heater according to claim 1, it is characterised in that the control assembly
Including a plasma power supply system, moisture control device, field operation box, electrode adjustment switch board, operating desk, control cabinet；
The both positive and negative polarity of one end of the plasma electric origin system connects heating plasma unit, the plasma by dc bus
The other end connection control cabinet of power-supply system, the moisture control device, field operation box, electrode adjustment switch board and operating desk
Connect the control cabinet simultaneously.
3. continuous casting production direct current plasma heater according to claim 2, it is characterised in that the heater
Also include a mechanical arm, the heating plasma unit is at least 2 plasma guns, and at least 2 plasma guns are fixed on
On mechanical arm；The electrode adjustment switch board connects the mechanical arm, and the mechanical arm can adjust between the plasma gun
Angle, adjustable range is 90 ° -270 °.
4. continuous casting production direct current plasma heater according to claim 3, it is characterised in that the plasma gun
For a hollow pipe shape, the hollow tube outside dimension is Φ 100-150mm, and length is 1000-1500mm, and diameter of bore is 1-
10mm；
Under in working order, plasma working air current is filled with the hollow tube, the plasma working air current will have been produced
Arc transfer between rifle and molten steel, form work arc.
5. continuous casting production direct current plasma heater according to claim 2, it is characterised in that the plasma electric
Origin system includes an isolating transformer and many pulse wave controlled rectification loops, the isolating transformer by high pressure and low pressure carry out every
From while high-tension electric current is converted into into low-voltage and high-current, and alternating current being changed by many pulse wave controlled rectification loops
Into low-voltage direct output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610552619.2A CN106001528B (en) | 2016-07-13 | 2016-07-13 | Continuous casting tundish direct-current plasma heating device using a plurality of graphite hollow bars as electrodes |
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|---|---|---|---|
| CN201610552619.2A CN106001528B (en) | 2016-07-13 | 2016-07-13 | Continuous casting tundish direct-current plasma heating device using a plurality of graphite hollow bars as electrodes |
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| CN114449723A (en) * | 2022-04-08 | 2022-05-06 | 北京奥邦新材料有限公司 | Device and method for improving power factor of tundish plasma heating system |
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| CN106001528A (en) | 2016-10-12 |
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