CN105779702B - A kind of VD stoves and its control method with molten steel temperature control device - Google Patents
A kind of VD stoves and its control method with molten steel temperature control device Download PDFInfo
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- CN105779702B CN105779702B CN201610352523.1A CN201610352523A CN105779702B CN 105779702 B CN105779702 B CN 105779702B CN 201610352523 A CN201610352523 A CN 201610352523A CN 105779702 B CN105779702 B CN 105779702B
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- molten steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Abstract
The embodiment of the invention discloses a kind of VD stoves with molten steel temperature control device and its control method, the VD stoves include ladle, it is provided between the liner and shell of the ladle in cavity, the cavity and is provided with air inlet pipe, escape pipe and two or more first temperature sensors；Bottom on the inside of the ladle, which is provided with the side wall on the inside of first playpipe and two or more second playpipes, the ladle, is additionally provided with the 3rd playpipe, and heater is provided with first playpipe, the second playpipe and the 3rd playpipe；Vacuum tank is additionally provided with the outside of the ladle, the vacuum tank is provided with controller and the second temperature sensor for detecting molten steel ladle temperature.From above technical scheme, VD stoves provided in an embodiment of the present invention and its control method, by carrying out active control to the temperature in VD stoves, improve the control accuracy and reaction speed of molten steel temperature of coming out of the stove, to ensure that pouring temperature is in optimal target range.
Description
Technical field
The present invention relates to technical field of smelting, more particularly to a kind of VD stoves and its control with molten steel temperature control device
Method processed.
Background technology
VD stoves (vacuum decarburization furnace, vacuum degassing furnace) can be carried out at vacuum outgas to molten steel
Reason and alloying component is finely adjusted under vacuo and argon gas stirring, is important smelting equipment in smelting iron and steel technique.It is logical
In the case of often, in order to ensure the quality of molten steel of VD stove outputs, when VD stoves are tapped, it is necessary to tap method (by steel of coming out of the stove using high temperature
Liquid temperature control is in higher temperature range).Although high temperature tapping can ensure the quality of molten steel, the temperature for the molten steel come out of the stove
Degree is higher, and the harm brought is bigger.For example, as the molten steel temperature come out of the stove is improved, the probability that steel accident of overflowing occurs may be increased,
Increase the thermic load of converter, reduce furnace life, increase smelting cost and environmental hazard etc..Therefore, by the molten steel temperature of coming out of the stove of VD stoves
Degree control has great importance in rational scope.
In the prior art, generally the molten steel temperature of coming out of the stove of VD stoves is predicted using neural network model, as prediction VD
When molten steel temperature in stove is reached in suitable scope, tapping steel is carried out, the control of the molten steel temperature of coming out of the stove of VD stoves is improved
Precision.But, the method that this simple use measurement data carries out temperature prediction has obvious hysteresis quality, causes molten steel of coming out of the stove
Temperature control is inaccurate.
The content of the invention
A kind of VD stoves and its control method with molten steel temperature control device are provided in the embodiment of the present invention, to solve
The problem of molten steel temperature control of coming out of the stove of VD stoves is inaccurate in the prior art.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical scheme：
A kind of VD stoves with molten steel temperature control device, including ladle, are provided between the liner and shell of the ladle
Cavity, is provided with air inlet pipe, escape pipe and two or more first temperature sensors in the cavity, described two or two
The temperature sensor of the above first is evenly distributed in the cavity；Bottom on the inside of the ladle provided with first playpipe and
Two or more second playpipes, the described two or playpipe of two or more second is equal centered on first playpipe
Even to set, straight up, the injection direction of second playpipe is towards the ladle for the injection direction of first playpipe
Side wall, be additionally provided with the 3rd playpipe on the side wall on the inside of the ladle, the injection direction of the 3rd playpipe is level side
To, and the side wall of the injection direction and the ladle of the 3rd playpipe is tangent, first playpipe, the second playpipe and
Heater is provided with 3rd playpipe；Be additionally provided with vacuum tank on the outside of the ladle, the vacuum tank provided with controller and
Second temperature sensor for detecting molten steel ladle temperature.
Preferably, helical vent pipe is provided with first playpipe.
Preferably, the helical angle of the helical vent pipe is 26 °.
Preferably, the two ends in the exit of second playpipe are provided with two circular ejection sections, described two circular jettings
Penetrate between portion provided with rectangular jet portion, the outer side edges in the rectangular jet portion are along provided with inclined water conservancy diversion on the outside of case rectangular jet portion
Plate.
Preferably, the ratio between the height in the diameter of the circular ejection section and the rectangular jet portion is 3:1.
Preferably, the angle in the deflector and the rectangular jet portion is 45 °.
Preferably, the fan-shaped central angle of the intersection of the injection area coverage of adjacent two second playpipes is
10 °~15 °.
Preferably, the 3rd playpipe is provided with bypass jet, the injection direction of the bypass jet it is vertical to
On.
A kind of control method of the VD stoves with molten steel temperature control device, using above-mentioned VD stoves, the control method
Including：
Step S100：Ladle is held after the molten steel come out of the stove according to molten steel temperature setting value from LF refining furnace, and ladle is put into
In vacuum tank, before processing measurement is carried out to molten steel temperature using second temperature sensor, molten steel before processing temperature is obtained；
Step S200：The temperature in cavity is measured using the first temperature sensor, and handled according to the molten steel
The temperature that preceding temperature is measured to first temperature sensor is demarcated, according to demarcation average value control air inlet pipe and escape pipe
The flow of interior air-flow；
Step S300：Control vacuum tank is vacuumized, and using the first playpipe to molten steel Argon；
Step S400：Vacuum stages are kept, the temperature in cavity is monitored in real time by the first temperature sensor, when
Temperature in cavity carries out Argon, when the temperature in cavity is in water in vertical direction skewness using the second playpipe
Square upwards skewness when, use the 3rd playpipe carry out Argon；Wherein, if the mean temperature change curve position of cavity
In in the curve threshold range of setting, then the temperature of molten steel is adjusted by changing the flow of air inlet pipe and escape pipe interior air-flow；
If the mean temperature change curve of cavity is beyond the curve threshold range of setting, by the heating power for changing heater
To adjust the temperature of molten steel；
Step S500：After vacuum breaker, measured after being handled by second temperature sensor molten steel temperature, obtain molten steel
Temperature after processing, temperature is adjusted to the setting value of molten steel temperature after being handled by molten steel, and carries out tapping steel.
Preferably, in the step S200, according to the flow of demarcation average value control air inlet pipe and escape pipe interior air-flow, tool
Body includes：The flow of air inlet pipe and escape pipe interior air-flow is adjusted according to relational expression Q1=k*T12, wherein, Q1 is the air-flow
Flow, T1 is the demarcation average value, and k is proportionality coefficient.
Preferably, the step S400 also includes：When the second playpipe and/or the 3rd playpipe carry out Argon, ladle
Interior Argon total flow is less than or equal to 120% during the independent Argon of the first playpipe, and the injection flow of the first playpipe is accounted for
More than the 50% of total flow.
Preferably, the step S400 also includes：When using the second playpipe and/or the 3rd playpipe Argon, first
Micro Argon is carried out using the aperture less than default opening value, argon blowing rate is then gradually increased, when increasing to default opening value
110% when reduce flow again, finally cause actual opening value matched with default opening value.
From above technical scheme, a kind of VD stoves with molten steel temperature control device provided in an embodiment of the present invention and
Its control method, by carrying out active control to the temperature in VD stoves, improves the control accuracy and reaction speed for molten steel temperature of coming out of the stove
Degree, to ensure that pouring temperature is in optimal target range, reaches reduction smelting cost, shortens the time smelted, improve smelting
The efficiency of refining, improves the purpose of the utilization rate of the energy.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, on the premise of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the VD stoves with molten steel temperature control device provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of first playpipe provided in an embodiment of the present invention；
Fig. 3 is a kind of structural representation of second playpipe provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of 3rd playpipe provided in an embodiment of the present invention；
Symbol in figure is expressed as：1st, ladle；2nd, vacuum tank；3rd, liner；4th, shell；5th, cavity；6th, air inlet pipe；7th, outlet
Pipe；8th, the first playpipe；9th, the second playpipe；10th, the 3rd playpipe；11st, the first temperature sensor；12nd, controller；13rd,
Two temperature sensors；14th, heater；15th, helical vent pipe；16th, circular ejection section；17th, rectangular jet portion；18th, deflector；
19th, jet is bypassed.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the present invention, below in conjunction with of the invention real
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described implementation
Example only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, should all belong to protection of the present invention
Scope.
Fig. 1 is a kind of structural representation of the VD stoves with molten steel temperature control device provided in an embodiment of the present invention, such as
Shown in Fig. 1, the VD stoves include ladle 1, are provided between the liner 3 and shell 4 of ladle 1 in cavity 5, cavity 5 and are provided with air inlet pipe 6
With escape pipe 7, air-flow can flow into cavity 5 by air inlet pipe 6, cavity 5 is flowed out by escape pipe 7, by the air-flow of flowing to ladle 1
Interior molten steel carries out cooling processing.In a kind of alternative embodiment of the invention, air inlet pipe 6 is arranged on the top of cavity 5, escape pipe
7 are arranged on the bottom of cavity 5.
For the ease of the temperature of molten steel in detection ladle 1, two or more first temperature biography is additionally provided with cavity 5
Sensor 11, the embodiment of the present invention is not particularly limited to the set location and setting quantity of the first temperature sensor 11, but is
More preferable Detection results are reached, in a kind of preferred embodiment of the invention first temperature sensor 11 cavity are evenly distributed on
In 5, to detect the temperature of the molten steel of each position in ladle 1 in time.
In embodiments of the present invention, it is succinct in order to describe, using the line between the bottom of ladle 1 and top center point as
The center line of ladle 1, using the direction along center line towards the top of ladle 1 as straight up, makees with the direction of central axis
For horizontal direction.
For cleaning molten steel, the first playpipe 8, the second playpipe 9 and the 3rd playpipe 10 are respectively equipped with inside ladle 1,
When holding molten steel in ladle 1, argon is sprayed into molten steel by the first playpipe 8, the second playpipe 9 and/or the 3rd playpipe 10
Gas can play a part of cleaning molten steel.
Wherein, the first playpipe 8 is arranged on the bottom centre position of ladle 1, and injection direction is straight up.
Fig. 2 is a kind of structural representation of first playpipe provided in an embodiment of the present invention, as shown in Fig. 2 in order to expand
Helical vent pipe 15 is provided with the jeting area of first playpipe 8, the first playpipe 8, argon gas is when by helical vent pipe 15
Spiral air flow, and then the argon gas formation spiral air flow for spraying the first playpipe 8 are formed, expands jeting area.It is optional in one kind
In embodiment, the helical angle of helical vent pipe 15 can select any number in 20 ° -30 °, in an advantageous embodiment,
Helical angle selects 26 °.
In embodiments of the present invention, the quantity of the second playpipe 9 is two or more, and injection direction is towards ladle 1
Side wall, that is, tilt upward.In order to improve the uniformity of argon gas injection, described two or the second playpipe of two or more 9 is with the
It is uniformly arranged centered on one playpipe 8, i.e., during described two or the second playpipe of two or more 9 is in respect to the center line of ladle 1
The heart is symmetrical arranged.
Fig. 3 is a kind of structural representation of second playpipe provided in an embodiment of the present invention, as shown in figure 3, in order to enter one
Step improves the injection uniformity, and the two ends in the exit of the second playpipe 9 are provided with two circular ejection sections 16, described two circular jettings
Penetrate between portion 16 provided with rectangular jet portion 17, the outer side edges in the rectangular jet portion 17 are along provided with the inclination to outside rectangular jet portion 17
Oblique deflector 18.In an advantageous embodiment, the diameter of the circular ejection section 16 and the height in the rectangular jet portion 17
The ratio between degree is 3:1；The angle in the deflector 18 and the rectangular jet portion 17 is 45 °；Two adjacent second injections
The fan-shaped central angle of the intersection of the injection area coverage of pipe 9 is 10 °~15 °.
It is pointed out that above-mentioned data are a kind of specific implementation provided in an embodiment of the present invention, this area skill
Art personnel can adjust accordingly according to actual needs, and it should fall under the scope of the present invention.For example, can be with
The ratio between height by the diameter of circular ejection section 16 and the rectangular jet portion 17 is set to 2:1 or 4:1；By deflector 18 and square
The angle of shape ejection section 17 is set to 40 ° or 50 ° etc..
In embodiments of the present invention, the 3rd playpipe 10 is arranged in the inside side walls of ladle 1, the spray of the 3rd playpipe 10
Direction is penetrated for horizontal direction, and the injection direction of the 3rd playpipe 10 and the side wall of ladle 1 are tangent.Pass through tangent setting side
Formula, can make side wall rotational flow of the air-flow that the 3rd playpipe 10 sprays along ladle 1, improve the injection uniformity.
Fig. 4 is a kind of structural representation of 3rd playpipe provided in an embodiment of the present invention, as shown in figure 4, the 3rd injection
Bypass jet 19 is additionally provided with pipe 10, the jeting area of the 3rd playpipe 10 can be improved by the 3rd jet.In this hair
In a kind of bright preferred embodiment, the injection direction of the bypass jet 19 is straight up.
Wherein, heater 14 is provided with the first playpipe 8, the second playpipe 9 and the 3rd playpipe 10, when the temperature of molten steel
During reduction, argon gas can be heated by adjusting the heating power of heater 14, and then improve the temperature of molten steel.
In addition, the outside of ladle 1 is additionally provided with vacuum tank 2, vacuumized by vacuum tank 2, ladle 1 can be maintained at vacuum
The controller 12 for controlling molten steel temperature and for detecting molten steel temperature in ladle 1 is additionally provided with stage, vacuum tank 2
Two temperature sensors 13.
From above technical scheme, a kind of VD stoves with molten steel temperature control device provided in an embodiment of the present invention can
To pass through 14 pairs of heater in the air-flow in cavity 5 and the first playpipe 8, the second playpipe 9 and/or the 3rd playpipe 10
Molten steel temperature in ladle 1 carries out active control, and then improves the control accuracy and reaction speed of molten steel temperature of coming out of the stove, to ensure
Pouring temperature is in optimal target range, reaches reduction smelting cost, shortens the time smelted, and improves the efficiency smelted,
Improve the purpose of the utilization rate of the energy.
On the basis of said apparatus embodiment, the embodiment of the present invention additionally provides a kind of with molten steel temperature control device
VD stoves control method, it is mainly included the following steps that：
Step S100：Ladle 1 is held after the molten steel come out of the stove according to molten steel temperature setting value from LF refining furnace, and ladle 1 is put
Enter in vacuum tank 2, before processing measurement is carried out to molten steel temperature using second temperature sensor 13, molten steel before processing temperature is obtained.
Under normal circumstances, the molten steel temperature come out of the stove from LF refining furnace is carried out according to molten steel temperature setting value by controller 12
Control, the molten steel come out of the stove from LF refining furnace is contained in ladle 1, and then ladle 1 is put into vacuum tank 2 and carried out at next step
Reason.Wherein, when ladle 1 is put into vacuum tank 2, second temperature sensor 13 can be used to carry out before processing survey to molten steel temperature
Amount, before processing measurement herein refers to the before processing measurement that molten steel is handled in VD stoves, obtains molten steel before processing temperature.
Step S200：The temperature in cavity 5 is measured using the first temperature sensor 11, and according to the molten steel at
The temperature that temperature is measured to first temperature sensor 11 before reason is demarcated, according to the demarcation average value control He of air inlet pipe 6
The flow of the interior air-flow of escape pipe 7.
Because the temperature in cavity 5 can reflect the temperature of molten steel indirectly, therefore, 11 pairs of skies of the first temperature sensor are used
Temperature in chamber 5 is measured, that is, measured using the first temperature sensor 11 to the temperature of molten steel, then basis
The temperature that molten steel before processing temperature is measured the first temperature sensor 11 is demarcated, and the He of air inlet pipe 6 is controlled according to calibration result
The flow of the interior air-flow of escape pipe 7, and then the temperature of molten steel is adjusted.Further, since the quantity of the first temperature sensor 11
To be multiple, therefore the temperature value of molten steel can be used as with the average value of temperature measured by multiple temperature sensors, i.e., according to mark
Allocate the flow of mean control air inlet pipe 6 and the interior air-flow of escape pipe 7.
Further, the corresponding relation of the flow of demarcation average value and air-flow is Q1=k*T1 2, wherein, Q1For the stream of air-flow
Amount, T1For demarcation average value, k is proportionality coefficient.As can be seen from the above equation, the proportional example of the flow of demarcation average value and air-flow is closed
System, that is to say, that the temperature of molten steel is higher, and the flow of air-flow is bigger, for accelerating to cool to molten steel；The temperature of molten steel is lower,
The flow of air-flow is smaller, and molten steel cooling is given for slowing down.
Step S300：Control vacuum tank 2 is vacuumized, and using the first playpipe 8 to molten steel Argon.
Argon is protection gas, can be with cleaning molten steel, therefore after control vacuum tank 2 is vacuumized, is started to molten steel Argon.
Wherein, the first playpipe 8 is used when starting Argon.
Step S400：Vacuum stages are kept, the temperature in cavity 5 is supervised in real time by the first temperature sensor 11
Control, when the temperature in cavity 5 is in vertical direction skewness, carries out Argon, when in cavity 5 using the second playpipe 9
Temperature in the horizontal direction skewness when, use the 3rd playpipe 10 carry out Argon；Wherein, if the average temperature of cavity 5
Spend change curve to be located in the curve threshold range of setting, then adjusted by changing the flow of air inlet pipe 6 and the interior air-flow of escape pipe 7
The temperature of whole molten steel；If the mean temperature change curve of cavity 5 is added beyond the curve threshold range of setting by changing
The heating power of hot device 14 adjusts the temperature of molten steel.
Because the first temperature sensor 11 is evenly distributed in cavity 5, therefore pass through relatively more different first temperature sensors
11 temperature values gathered, you can judge in cavity 5 the uniformity of temperature profile degree of (molten steel).Vertical direction is distributed in for example, working as
The temperature difference that is gathered of the first temperature sensor 11 when being more than given threshold, determine the temperature in the first cavity 5 in Vertical Square
To skewness, now argon, the argon tilted upward ejected by the second playpipe 9 can be sprayed by the second playpipe 9
Gas, can improve the uniformity of the molten steel in vertical direction.Gathered when the first temperature sensor 11 of distribution in the horizontal direction
When temperature difference is more than given threshold, temperature in the first cavity 5 skewness in the horizontal direction is determined, now can be by the
Three playpipes 10 spray argon, and the argon gas of the horizontal direction ejected by the 3rd playpipe 10 can improve molten steel in the horizontal direction
The uniformity.
Wherein, in order to improve the stationarity of temperature adjusting, when the second playpipe 9 and/or the 3rd playpipe 10 carry out Argon
When, the Argon total flow in ladle 1 is less than or equal to 120% during the first 8 independent Argon of playpipe, and the first playpipe 8
Injection flow accounts for more than the 50% of total flow；When using the second playpipe 9 and/or the 3rd 10 Argon of playpipe, first by
Aperture less than default opening value carries out micro Argon, is then gradually increased argon blowing rate, when increasing to default opening value
Flow is reduced when 110% again, finally actual opening value is matched with default opening value.
In addition, if the mean temperature change curve of cavity 5 is located in the curve threshold range of setting, then by changing
The flow of air inlet pipe 6 and the interior air-flow of escape pipe 7 adjusts the temperature of molten steel；Set if the mean temperature change curve of cavity 5 exceeds
Fixed curve threshold range, then adjust the temperature of molten steel by changing the heating power of heater 14.Heater 14 plus
Thermal power adjustment amplitude adoption rate-differential regulation relation, the reference object of wherein ratio adjustment relation is the temperature in cavity 5
Amplitude of variation, the reference object of differential regulation relation is that Argon total flow adjusts amplitude in ladle 1.
Step S500：After vacuum breaker, measured after being handled by second temperature sensor 13 molten steel temperature, obtain steel
Temperature after liquid processing, temperature is adjusted to the setting value of molten steel temperature after being handled by molten steel, and carries out tapping steel.
Temperature is to steel after the before processing temperature gathered after the completion of per treatment using second temperature sensor 13 and processing
Liquid desired temperature carries out secondary adjustment.Adjustment process uses multi-variable system, wherein the variable selected can include：Ladle 1
This stove is by molten steel soak time, and stove is by molten steel soak time on ladle 1, the cool time of ladle 1, stove cool time, VD on ladle 1
Initial temperature, the VD initial thermometric moment start high vacuum moment, VD high vacuum retention times, VD to VD and uncapped the thermometric to after uncapping
13 factors such as moment, tap, liquidus temperature, VD process Argons amount, VD tank cool times and upper stove use time.
After the completion of variables choice, the measurement result for setting up second temperature sensor 13 adjusts mesh by each variable and then extremely
Target transmission function, the calculating by measurement result Jing Guo transmission function, and carry out after weighted average, obtain secondary adjustment result.
Transmission function uses discrete vertical simulation, is then obtained by linear regression method.
From above technical scheme, the embodiment of the present invention passes through before and after the refining of VD stoves and in vacuum
Temperature survey, to the molten steel temperature of VD stoves monitor and adjust in real time, changes steel in VD stoves refining process in the prior art
The state that liquid temperature degree is passively reduced, by controlling the flow of Argon mode and cavity air-flow, the reduction to molten steel temperature is led
Intervene dynamic formula, the promptness adjusted for molten steel temperature is drastically increased, for the temperature occurred in VD stove refining process
Fluctuation can be adjusted rapidly accordingly, so as to significantly improve the control accuracy of molten steel tapping temperature.
It should be noted that herein, the relational terms of such as " first " and " second " or the like are used merely to one
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include those
Key element, but also other key elements including being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in the process including the key element, method, article or equipment.
Described above is only the embodiment of the present invention, is made skilled artisans appreciate that or realizing this hair
It is bright.A variety of modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (12)
1. it is additionally provided with vacuum on the outside of a kind of VD stoves with molten steel temperature control device, including ladle (1), the ladle (1)
Tank (2), it is characterised in that be provided with cavity (5), the cavity (5) and set between the liner (3) and shell (4) of the ladle (1)
There are air inlet pipe (6), escape pipe (7) and two or more first temperature sensors (11), described two or two or more
One temperature sensor (11) is evenly distributed in the cavity (5)；
Bottom on the inside of the ladle (1) is provided with first playpipe (8) and two or more second playpipes (9),
The described two or playpipe of two or more second (9) is uniformly arranged centered on first playpipe (8), first injection
Manage the injection direction of (8) straight up, the injection direction of second playpipe (9) towards the ladle (1) side wall, it is described
The 3rd playpipe (10) is additionally provided with side wall on the inside of ladle (1), the injection direction of the 3rd playpipe (10) is level side
To, and the side wall of the injection direction and the ladle (1) of the 3rd playpipe (10) is tangent, first playpipe (8),
Heater (14) is provided with two playpipes (9) and the 3rd playpipe (10)；
The vacuum tank (2) is provided with controller (12) and for detecting that the second temperature of ladle (1) interior molten steel temperature is sensed
Device (13).
2. VD stoves according to claim 1, it is characterised in that helical vent pipe is provided with first playpipe (8)
(15)。
3. VD stoves according to claim 2, it is characterised in that the helical angle of the helical vent pipe (15) is 26 °.
4. VD stoves according to claim 1, it is characterised in that the two ends in the exit of second playpipe (9) are provided with
Rectangular jet portion (17) are provided between two circular ejection sections (16), described two circular ejection sections (16), the rectangular jet
The outer side edges edge in portion (17) is provided with the inclined deflector (18) on the outside of rectangular jet portion (17).
5. VD stoves according to claim 4, it is characterised in that the diameter of the circular ejection section (16) sprays with the rectangle
It is 3 to penetrate the ratio between the height in portion (17):1.
6. VD stoves according to claim 4, it is characterised in that the deflector (18) and the rectangular jet portion (17)
Angle is 45 °.
7. VD stoves according to claim 1, it is characterised in that the injection of two adjacent second playpipes (9) is covered
The fan-shaped central angle of the intersection of capping product is 10 °~15 °.
8. VD stoves according to claim 1, it is characterised in that the 3rd playpipe (10) is provided with bypass jet
(19), it is described bypass jet (19) injection direction straight up.
9. a kind of control method of the VD stoves with molten steel temperature control device, it is characterised in that any using claim 1-8
VD stoves described in, the control method includes：
Step S100：Ladle (1) is held after the molten steel come out of the stove according to molten steel temperature setting value from LF refining furnace, and ladle (1) is put
Enter in vacuum tank (2), before processing measurement is carried out to molten steel temperature using second temperature sensor (13), molten steel before processing temperature is obtained
Degree；
Step S200：The temperature in cavity (5) is measured using the first temperature sensor (11), and according to the molten steel at
The temperature that temperature is measured to first temperature sensor (11) before reason is demarcated, according to demarcation average value control air inlet pipe
(6) and escape pipe (7) interior air-flow flow；
Step S300：Control vacuum tank (2) is vacuumized, and using the first playpipe (8) to molten steel Argon；
Step S400：Vacuum stages are kept, the temperature in cavity (5) is supervised in real time by the first temperature sensor (11)
Control, when the temperature in cavity (5) is in vertical direction skewness, carries out Argon using the second playpipe (9), works as cavity
(5) temperature in the horizontal direction skewness when, use the 3rd playpipe (10) to carry out Argon；Wherein, if cavity
(5) mean temperature change curve is located in the curve threshold range of setting, then by changing air inlet pipe (6) and escape pipe
(7) flow of interior air-flow adjusts the temperature of molten steel；If the mean temperature change curve of cavity (5) is beyond the curve threshold of setting
It is worth scope, then adjusts the temperature of molten steel by changing the heating power of heater (14)；
Step S500：After vacuum breaker, measured after being handled by second temperature sensor (13) molten steel temperature, obtain molten steel
Temperature after processing, temperature is adjusted to the setting value of molten steel temperature after being handled by molten steel, and carries out tapping steel.
10. method according to claim 9, it is characterised in that in the step S200, according to demarcation average value control into
The flow of tracheae (6) and escape pipe (7) interior air-flow, is specifically included：
According to relational expression Q1=k*T1 2The flow of air inlet pipe (6) and escape pipe (7) interior air-flow is adjusted, wherein, Q1For the air-flow
Flow, T1For the demarcation average value, k is proportionality coefficient.
11. method according to claim 9, it is characterised in that the step S400 also includes：
When the second playpipe (9) and/or the 3rd playpipe (10) carry out Argon, the Argon total flow in ladle (1) be less than or
Equal to the first playpipe (8) individually Argon when 120%, and the first playpipe (8) injection flow account for the 50% of total flow with
On.
12. method according to claim 9, it is characterised in that the step S400 also includes：
When using the second playpipe (9) and/or the 3rd playpipe (10) Argon, first by the aperture less than default opening value
Micro Argon is carried out, argon blowing rate is then gradually increased, flow is reduced again when increasing to the 110% of default opening value, most
Eventually actual opening value is matched with default opening value.
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