CN1063690C - Method for plasma heating ladle online to cast continuously at constant low overheated temperature - Google Patents
Method for plasma heating ladle online to cast continuously at constant low overheated temperature Download PDFInfo
- Publication number
- CN1063690C CN1063690C CN97119787A CN97119787A CN1063690C CN 1063690 C CN1063690 C CN 1063690C CN 97119787 A CN97119787 A CN 97119787A CN 97119787 A CN97119787 A CN 97119787A CN 1063690 C CN1063690 C CN 1063690C
- Authority
- CN
- China
- Prior art keywords
- molten steel
- temperature
- ladle
- heating
- pans
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to method for continuously casting molten steel at constant low overheated temperature, which is characterized in that inert gases are blown in from the bottom of a ladle in the process of casting the molten steel; the liquid level of the molten steel in the ladle is tracked and continuously heated by a plasma torch; the heating power of the plasma torch is regulated, and the temperature reduction of the molten steel in the casting process is compensated; thereby, the overheated degree of the molten steel in a tundish can be reduced to the degree which approaches to the ideal zero degree. Temperature fluctuation can be also controlled between liquids lines and the ideal overheated degree, and continuous casting at constant temperature which is lower than low overheated degree of the whole process can be realized. The casting speed can be greatly increased, and the quality of steel blanks is made uniform and stable. The present invention which can reduce material consumption has the advantage of energy saving.
Description
The present invention relates to Ferrous Metallurgy field plasma heating low superheat-degree constant-temperature continuous casting technology.
(for example the degree of superheat is less than 5 ℃ to realize the molten steel low superheat-degree constant-temperature continuous casting, temperature fluctuation is less than 5 ℃), producing high-quality and high-quality steel thereby reach with the highest speed and the mode of saving most, is the dreamboat that steel-making continuous casting technology is being pursued for a long time always.
In the whole process cycle of molten steel continuous casting, molten steel flows into the crystallizer through long nozzle, pans, middle pot drainage opening from ladle, is dispelling the heat always, liquid steel temperature is reducing always, if liquid steel temperature drops to below the liquidus curve, molten steel will solidify and stop, and then cast can not be carried out.In order to guarantee that continuous casting later stage molten steel can be because of cooling stop, existing method has: 1, and the tapping temperature of raising converter or electric furnace; But this can make furnace life, bag reduce age, and steel-making cycle lengthening, and energy consumption, raw materials consumption increase, and poring rate is slow, and billet quality is poor; 2, be in steel ladle, to preheat temperature adjustment (for example LF stove); Though this method has solved the too high problem of tapping temperature, because of not being heats temperature adjustment in casting process, still can not realize constant-temperature continuous casting, more can't realize low superheat-degree constant-temperature continuous casting, poring rate and billet quality are still lower, and energy dissipation is also bigger; 3, be to molten steel heating temperature adjustment in pans; Under the situation short at casting cycle, that the ladle heat insulation condition is good, this method can realize constant-temperature continuous casting; But in order to guarantee the unlikely low temperature cutout of big Baogang water, the initial degree of superheat of big Baogang water must improve, thereby makes the also corresponding raising of cast initial stage pans molten steel overheat, therefore also can not realize low superheat-degree constant-temperature continuous casting under the duration of pouring long situation.
In the prior art existing using plasma carries out pre-warmed method to ladle molten steel, though solved the problem of the too high and liquid steel refining of tapping temperature, preheats and can not realize constant-temperature continuous casting, more can't realize low superheat-degree constant-temperature continuous casting; Is to solve one of effective ways of constant-temperature continuous casting with the plasma heating means to pans molten steel heating temperature adjustment, but still can not realize low superheat-degree constant-temperature continuous casting, especially under the long situation of casting cycle.Yet there are no in the whole cycle of continuous casting, using plasma carries out the report of the method realization low superheat-degree constant-temperature continuous casting of on-line continuous heating temperature adjustment to ladle molten steel.
The object of the invention is to provide a kind of using plasma that ladle molten steel is carried out on-line continuous heating temperature adjustment to realize the method for molten steel low superheat-degree constant-temperature continuous casting.
The present invention realizes the method for molten steel low superheat-degree constant-temperature continuous casting, it is characterized in that: in the pouring molten steel process, blow into the stirring of inert gas molten steel from ladle bottom; In ladle, produce molten steel in the plasma heating ladle with arc discharge method above the liquid steel level; Plasma torch is followed the tracks of the liquid steel level height change, heats to molten steel continuously; Regulate the plasma heating power, the time dependent temperature of molten steel reduces in the compensation casting process, makes the interior liquid steel temperature of pans keep constant.
The control method of described plasma heating power is: measure molten steel temperature in tundish change curve under the no heating state in advance, required heating power curve when tundish molten steel constant temperature is sent as an envoy in calculating is regulated the plasma heating power by computer automatically according to this heating power curve; In the stable casting process therein, also can adopt automatic feedback regulation heating power according to the temperature of continuous measurement pans molten steel.
The first packet molten steel is opened and is watered the starting stage, can adopt same set of plasma boiler or the special-purpose plasma boiler heating of employing pans molten steel to the ladle heating; When adopting two cover plasma torch, can shared same set of power supply, source of the gas, cooling water source and backflow hearth electrode; Heating power can be determined molten steel heat absorption power according to the cold wall of new pans, generally adopt the peak power of firing equipment.
The inventive method adopts in the whole cycle at continuous casting and is blown into inert gas from ladle bottom, not only can stir molten steel, and the interior liquid steel temperature of ladle is evenly distributed, and helps removing the pernicious gas in the molten steel, also plays the effect of removing impurities simultaneously; Can replace the stand effect of liquid steel refining of Argon.
The inventive method heats ladle molten steel with plasma in the continuous pouring process, and open at the first packet molten steel and to water the starting stage, employing is to the same set of plasma boiler or the special-purpose plasma boiler heating pans molten steel of ladle heating, with the bigger temperature drop of compensation cast initial stage pans molten steel, can make the interior liquid steel temperature of pans keep constant, thereby realize continuous casting overall process low superheat-degree constant-temperature continuous casting; Solved prior art and be reach can keep temperature that molten steel continues cast improve tapping temperature or to big Baogang water pre-heated method the molten steel constant-temperature continuous casting problem that can't realize; Also solved the irrealizable low superheat-degree constant-temperature continuous casting problem of method that in pans, molten steel is heated temperature adjustment that adopts.
In the continuous casting overall process, adopt heating method for regulating temperature of the present invention, the degree of superheat of pans molten steel can be dropped near desirable zero degree, thereby the fluctuation of temperature also can be controlled between the liquidus curve and the desirable degree of superheat.
Adopt the constant-temperature continuous casting under the inventive method realization overall process low overheat, poring rate is improved greatly, thereby can improve and stable billet quality, shorten the steel-making time, improve continuous casting output, save the energy, reduce raw materials consumption and refractory consumption rate; And can replace the stand effect of liquid steel refining of Argon.
Below in conjunction with accompanying drawing, the present invention is described in further detail by embodiment.
Accompanying drawing 1 is that using plasma of the present invention is to the online heating principle schematic diagram of ladle;
Fig. 2 is used for first packet pouring molten steel starting stage heating pans molten steel principle schematic with the online plasma boiler of ladle;
Fig. 3 will be respectively applied for the online heating of ladle and be used to pour into a mould two cover plasma torch of starting stage pans heating, the principle schematic of shared cover power supply, source of the gas and a cooling water source;
Fig. 4 is in the control method of plasma heating power, sets the schematic diagram of heating power adjustment curve according to the liquid steel temperature change curve of measuring in advance.
As shown in Figure 1, in the pouring molten steel process, the molten steel 5 in the steel ladle 4 continues to flow into pans 9 through long nozzle 8, and 11 lasting outflows are poured in the conticaster crystallizer pans molten steel 10 through the mouth of a river.Adopt the inventive method, be in the casting process of continuous casting steel machine, plasma torch 2 is inserted in the steel ladle 4, use plasma torch supporting mechanism 1 to move up and down by the operate plasma torch, dynamically follow the tracks of the liquid steel level height, the suitable distance between maintenance plasma torch and the liquid steel level is to satisfy the requirement of heating power.Sparking electrode is plasma torch and molten steel, produces plasma 3 by discharge above liquid steel level, by modes such as radiation, conduction, convection current heat is delivered to molten steel.
The inventive method adopts in the whole cycle at continuous casting and is blown into inert gas from the bottom, and inert gas is blown into the molten steel 5 from ladle bottom through valve 12, pipeline 13, air brick 14, stirs molten steel, makes liquid steel temperature even; Play liquid steel degassing and the refining effect that separates field trash of making simultaneously; Also play a part to blow slag blanket on the liquid steel level open, make liquid steel level be directly exposed to below, plasma zone, help improving the efficiency of heating surface.
The inventive method heats ladle molten steel with plasma in the continuous pouring process, electric current is from power supply 15, through plasma torch 2, plasma 3, ladle molten steel 5, by ladle bottom conductive brick 6 (hearth electrode), busbar 7, get back to power supply 15.
In the first packet pouring molten steel starting stage, removable plasma torch supporting mechanism 1 inserts plasma torch 2 in the pans 9, the pans molten steel is heated the molten steel heat that is absorbed with the cold wall of pans that compensates new use.Pans are not established hearth electrode, utilize the ladle bottom conductive brick as return electrode, and electric current returns through pans molten steel, long nozzle molten steel fluidization tower, ladle molten steel.
To the online heating of ladle with to the pans heating, also can use two cover plasma torch respectively, and shared same set of power supply, source of the gas and cooling water source and hearth electrode.As shown in Figure 3.Power supply 15 is supplied with the plasma torch 2 and 19 of ladle and pans heating respectively through change-over switch 20, bus 21,22; Cooling water source 29 is supplied with the plasma torch of ladle and pans heating respectively through transfer valve 24, pipeline 23,25; Source of the gas 30 is supplied with ladle and pans heating plasma torch respectively through transfer valve 27, pipeline 26,28.
In the casting process of continous-stable, total if variation that heating power is directly proportional with heat radiation power, the energy that additional heat radiation loses can guarantee the temperature stabilization of molten steel in ladle and the pans; In Baogang's water cast later stage (when ladle molten steel will water), temperature was higher than the temperature of desirable low superheat-degree constant-temperature cast when the increase heating power made ladle residue molten steel flow into pans, like this in changing the steel ladle process, pans are under the situation that no hot molten steel replenishes, and liquid steel temperature can remain on the temperature line of desirable low overheat cast and realize the low superheat-degree constant-temperature cast.
First packet is opened when watering, because the pans initial temperature is lower, rapid heat dissipation, the molten steel temperature drop that has just flowed into pans is bigger, generally require the first packet liquid steel temperature to be higher than to connect casting ladle times 20 ℃, the first packet molten steel is opened water that the pans molten steel overheat is higher than the desirable low overheat of stablizing casting process in a period of time of back.Can be with to the plasma torch of ladle heating, also can establish the plasma torch heating pans molten steel of pans heating separately, to replenish the heat that the cold wall of new pans absorbs molten steel, then can reduce the molten steel overheat of first casting ladle, cooperate with the online heating of ladle, realize the overall process low superheat-degree constant-temperature continuous casting.
Illustrate according to liquid steel temperature to change how to carry out the heating power adjusting below in conjunction with accompanying drawing 4, realize the principle of low superheat-degree constant-temperature continuous casting.
Among Fig. 4, curve 1,2 is respectively the variation of ladle when not having heating, pans liquid steel temperature, curve 3,4 is respectively the change curve that ladle, pans liquid steel temperature when ladle is online to be heated are arranged, curve 7,8 is respectively pans, ladle plasma heating power change curve, 8-1 is that first packet is opened ladle heating power curve when having watered the pans heating, curve 5,6 is respectively first packet and opens ladle when having watered the pans heating, pans liquid steel temperature change curve.01～05 opens for ladle and to water constantly, and E1～E5 is that ladle has watered constantly, and ET has watered the moment for the pans molten steel; L0 is a liquidus temperature, and P0 is the heating power zero line.
Do not have under the heating temperature adjustment situation, the first packet molten steel opens that the degree of superheat is T9 when watering, and connects to water to unwrap that the degree of superheat is T8 when watering, and the highest degree of superheat of pans molten steel is T7, and the minimum degree of superheat of pans molten steel is near liquidus curve L0.Adopt the online heating temperature adjustment of ladle, with second Baogang's water is example, in stablizing casting process (t7～t8 is in the time period), open to water and be t7 constantly, the ladle molten steel degree of superheat is T3, go out heat radiation power according to hot-metal carburized steel coolant-temperature gage change calculations in the middle of the premeasuring and change (it is consistent that the variation of this heat radiation power changes with the ladle heat radiation power), heating power is by trapezoidal adjusting (also can regulate continuously), fluctuating (curve 3) in (as ± 4 ℃) very among a small circle near the consistent ladle molten steel temperature that then keeps with the heat radiation power curve, and middle Baogang coolant-temperature gage fluctuation range (as ± 2 ℃) littler (curve 4).Finish t8 constantly at ladle molten steel near cast, improve heating power to maximum, stop heating constantly at t9, ladle molten steel temperature (degree of superheat) rises to T5, a little more than thermal stability degree T3, make ladle molten steel water (t10) constantly, the middle coolant-temperature gage degree of superheat T1 of Baogang is a little more than equilibrium temperature T0, and t10～t11 in changing packet procedures, middle Baogang coolant-temperature gage continue to reduce, when t11, be reduced to minimum point, be higher than liquidus curve L0.When no pans heat temperature adjustment, absorb heat in order to compensate the cold wall of pans, the first packet molten steel is opened and watered the degree of superheat is T6, the maximum degree of superheat of pans is T2.At t4 constantly, when the ladle molten steel temperature dropped to desirable low overheat T3, beginning to heat the heating power curve was 8 (heavy lines), guarantees that first packet molten steel latter temperature is constant.
As establishing heater at pans, then the first packet molten steel is opened and is watered the degree of superheat and can reduce to T4 by T6, after having molten steel, heat with peak power at once during t1 by the back pans opening to water, heating power curve 7 (thick chain-dotted line), treat that t2 after the pans liquid steel temperature rises stops the pans heating constantly at t8 when the ladle molten steel temperature is reduced to desirable low overheat T3 constantly, beginning is heated at ladle, and the heating power curve is 8-1 (thick dashed line).Ladle, middle Baogang coolant-temperature gage change curve are respectively curve 5,6.
In the above-mentioned example, plasma can produce with direct current, and also available interchange produces; Plasma torch can be a negative electrode, also can be anode, and corresponding hearth electrode then is respectively anode and negative electrode; Plasma torch can be transferred arc torch (in the present embodiment for transferred arc torch), also can be the untransferable arc torch, the latter's characteristics be sparking electrode all on plasma torch, do not need ladle hearth electrode loop; Also available graphite electrode carries out arc discharge and produces plasma.
In the above-mentioned example, the bottom blown gas stirring method also can be inserted gas blow pipe from the ladle top to molten steel, and the gas blow pipe straight cutting arrives near ladle bottom.
Claims (3)
1, a kind of method that realizes the molten steel low superheat-degree constant-temperature continuous casting is characterized in that: in the pouring molten steel process, blow into inert gas from ladle bottom; In ladle, heat to molten steel continuously with plasma torch above the liquid steel level; Regulate the plasma heating power, the temperature of molten steel reduces in the compensation casting process, makes the interior liquid steel temperature of pans keep constant.
2, molten steel low superheat-degree constant-temperature continuous casting method according to claim 1, the control method that it is characterized in that described plasma heating power is: measure molten steel temperature in tundish change curve under the no heating state in advance, required heating power curve when tundish molten steel constant temperature is sent as an envoy in calculating is regulated according to this heating power curve automatically by computer.
3, molten steel low superheat-degree constant-temperature continuous casting method according to claim 1, the heating means that it is characterized in that described plasma are: the first packet molten steel is opened and is watered the starting stage, adopts same set of plasma boiler or the special-purpose plasma boiler heating of employing pans molten steel to the ladle heating; Or adopt two covers during plasma torch respectively, shared same set of power supply, source of the gas, cooling water source and backflow hearth electrode; Heating power is determined molten steel heat absorption power according to the new cold wall of pans.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97119787A CN1063690C (en) | 1997-11-14 | 1997-11-14 | Method for plasma heating ladle online to cast continuously at constant low overheated temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97119787A CN1063690C (en) | 1997-11-14 | 1997-11-14 | Method for plasma heating ladle online to cast continuously at constant low overheated temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1217959A CN1217959A (en) | 1999-06-02 |
| CN1063690C true CN1063690C (en) | 2001-03-28 |
Family
ID=5175575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97119787A Expired - Fee Related CN1063690C (en) | 1997-11-14 | 1997-11-14 | Method for plasma heating ladle online to cast continuously at constant low overheated temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1063690C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101062520B (en) * | 2006-04-26 | 2010-10-13 | 宝山钢铁股份有限公司 | Pouring basket heating arrangement for continuous casting technology |
| DE102009031236B3 (en) * | 2009-06-26 | 2010-12-02 | Salzgitter Flachstahl Gmbh | Producing steel strip by strip casting, comprises placing metal melt from feed vessel to rotating casting strip of horizontal strip casting system by casting groove and siphon-like outlet area formed as casting nozzle under protective gas |
| CN102764871B (en) * | 2012-07-18 | 2014-12-31 | 上海大学 | Method for realizing low superheat pouring of continuous casting process by using high-intensity magnetic field, and device for method |
| JP6381868B2 (en) * | 2013-01-25 | 2018-08-29 | 株式会社神戸製鋼所 | Continuous casting method of ingot made of titanium or titanium alloy |
| CN106001528B (en) * | 2016-07-13 | 2017-05-10 | 北京麦特尔科技有限公司 | Continuous casting tundish direct-current plasma heating device using a plurality of graphite hollow bars as electrodes |
| CN108296463B (en) * | 2017-10-26 | 2021-01-01 | 新疆八一钢铁股份有限公司 | Method for controlling superheat degree of continuous casting tundish |
| CN108838356B (en) * | 2018-07-18 | 2021-04-16 | 中铝华中铜业有限公司 | Continuous casting production method of oxygen-free silver copper |
| CN112974754B (en) * | 2021-02-09 | 2022-10-18 | 鞍钢股份有限公司 | Method for preserving molten steel of abnormal molten steel tank |
| CN113102711A (en) * | 2021-04-01 | 2021-07-13 | 中国第一重型机械股份公司 | Method and device for producing forged piece |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067398A (en) * | 1991-06-05 | 1992-12-30 | 通用电气公司 | Method and apparatus with the casting arc melted metal material of ingot form |
-
1997
- 1997-11-14 CN CN97119787A patent/CN1063690C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067398A (en) * | 1991-06-05 | 1992-12-30 | 通用电气公司 | Method and apparatus with the casting arc melted metal material of ingot form |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1217959A (en) | 1999-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1063690C (en) | Method for plasma heating ladle online to cast continuously at constant low overheated temperature | |
| JP2000130948A (en) | Molten holding furnace for aluminum ingot, or the like | |
| CN111100968B (en) | Full scrap steel continuous steelmaking system and smelting process | |
| CN111136253B (en) | Plasma heating method and plasma heating system for tundish molten steel | |
| CN114505459B (en) | Automatic molten steel temperature control casting system of continuous casting machine | |
| EP0646757B1 (en) | Dc arc furnace | |
| JP6772677B2 (en) | Tandish internal molten steel heating method and tundish plasma heating device | |
| JPH02225630A (en) | Heating melting method and melting device | |
| CN101006752B (en) | Method and device for operating an electric-arc furnace | |
| CA1137273A (en) | Horizontal continuous casting process and apparatus for continuously producing bolts, rolled plates, and bands | |
| JPH0224184B2 (en) | ||
| CN1270852C (en) | Electroslag remelting feeding process | |
| CN219520431U (en) | Device for controlling liquid level of tundish of smelting furnace | |
| CN113714495A (en) | Continuous casting tundish direct-current plasma arc heating control method | |
| DE3373014D1 (en) | Process for operating a metallurgical melting-furnace, and metallurgical melting-furnace | |
| AU656575B2 (en) | Heating method and apparatus | |
| JPH03243254A (en) | Method for heating molten steel in tundish and tundish providing heating device | |
| RU74125U1 (en) | INSTALLATION FOR ELECTRON BEAM METAL Smelting | |
| CN1122371A (en) | Method for remelting ferro-silicon alloy powder in induction furnace | |
| JPS59202142A (en) | Heating method of nozzle to be immersed into tundish | |
| CN1031629C (en) | Metal refinery and continuous casting complex device | |
| CN110254957B (en) | High-temperature liquid container system and heat preservation method thereof | |
| KR100335605B1 (en) | Heat controllable tundish | |
| JP3693028B2 (en) | Preheating device for tundish for continuous casting and its preheating method | |
| JPH03221246A (en) | Method for heating molten steel in molten steel vessel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |