CN105779702A - VD furnace with molten steel temperature control device and control method of VD furnace - Google Patents
VD furnace with molten steel temperature control device and control method of VD furnace Download PDFInfo
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- CN105779702A CN105779702A CN201610352523.1A CN201610352523A CN105779702A CN 105779702 A CN105779702 A CN 105779702A CN 201610352523 A CN201610352523 A CN 201610352523A CN 105779702 A CN105779702 A CN 105779702A
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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 VD furnace with a molten steel temperature control device and a control method of the VD furnace. The VD furnace comprises a steel ladle. A cavity is formed between a lining and a shell of the steel ladle. The cavity is internally provided with an air inlet pipe, an air outlet pipe and two or more first temperature sensors. A first injection pipe and two or more second injection pipes are arranged at the bottom of the inner side of the steel ladle. A third injection pipe is further arranged on the side wall of the inner side of the steel ladle. Heaters are arranged in the first injection pipe, the second injection pipes and the third injection pipe. A vacuum tank is further arranged on the outer side of the steel ladle and provided with a controller and a second temperature sensor used for detecting the temperature of molten steel in the steel ladle. According to the above technical scheme and the VD furnace and the control method thereof in the embodiment, the temperature in the VD furnace is actively regulated and controlled, the control precision for the temperature of molten steel discharged out of the furnace is improved, the reaction speed for the temperature of molten steel discharged out of the furnace is increased, and therefore it can be guaranteed that the pouring temperature is in the optimal target value range.
Description
Technical field
The present invention relates to technical field of smelting, particularly relate to a kind of VD stove with molten steel temperature control device and control method thereof.
Background technology
VD stove (vacuumdecarburizationfurnace, vacuum degassing furnace) molten steel can be carried out Fruit storage and under vacuo alloy composition finely tune and argon stirring, be smelting equipment important in smelting iron and steel technique.Under normal circumstances, in order to ensure the quality of molten steel of VD stove output, when VD stove is tapped, it is necessary to adopt high temperature tapping method (controlling molten steel temperature of coming out of the stove in higher temperature range).Although high temperature tapping can ensure that the quality of molten steel, but the temperature of the molten steel come out of the stove is more high, and the harm brought is more big.Such as, along with the molten steel temperature come out of the stove improves, it is possible to increase the probability that steel accident of overflowing occurs, increase the thermic load of converter, reduce furnace life, increase smelting cost and environmental hazard etc..Therefore, control, in rational scope, to have great importance by the molten steel temperature of coming out of the stove of VD stove.
In prior art, generally adopt neural network model that the molten steel temperature of coming out of the stove of VD stove is predicted, when the molten steel temperature predicted in VD stove reaches in suitable scope, carry out tapping steel, improve the control accuracy of the molten steel temperature of coming out of the stove of VD stove.But, the method that this simple employing measurement data carries out temperature prediction has obvious hysteresis quality, and the molten steel temperature that causes coming out of the stove controls inaccurate.
Summary of the invention
The embodiment of the present invention provides a kind of VD stove with molten steel temperature control device and control method thereof, to solve the molten steel temperature inaccurate problem of control of coming out of the stove of VD stove in prior art.
In order to solve above-mentioned technical problem, the embodiment of the invention discloses following technical scheme:
A kind of VD stove with molten steel temperature control device, including ladle, it is provided with cavity between liner and the shell of described ladle, it is provided with air inlet pipe, escape pipe and two or more the first temperature sensors, said two or two or more the first temperature sensor in described cavity to be evenly distributed in described cavity；Bottom inside described ladle is provided with first playpipe and two or more second playpipes, said two or two or more the second playpipe are uniformly arranged centered by described first playpipe, the injection direction of described first playpipe is straight up, the injection direction of described second playpipe is towards the sidewall of described ladle, sidewall inside described ladle is additionally provided with the 3rd playpipe, the injection direction of described 3rd playpipe is horizontal direction, and the injection direction of described 3rd playpipe is tangent with the sidewall of described ladle, described first playpipe, it is provided with heater in second playpipe and the 3rd playpipe；The outside of described ladle is additionally provided with vacuum tank, and described vacuum tank is provided with controller and for detecting the second temperature sensor of molten steel ladle temperature.
Preferably, it is provided with helical vent pipe in described first playpipe.
Preferably, the helical angle of described helical vent pipe is 26 °.
Preferably, the two ends in the exit of described second playpipe are provided with two circular ejection sections, are provided with rectangular jet portion between said two circle ejection section, and the outer side edges in described rectangular jet portion is along being provided with the deflector tilted outside case rectangular jet portion.
Preferably, the described circular diameter of ejection section is 3:1 with the ratio of the height in described rectangular jet portion.
Preferably, described deflector is 45 ° with the angle in described rectangular jet portion.
Preferably, the fan-shaped central angle of the intersection of the injection area coverage of two adjacent described second playpipes is 10 °～15 °.
Preferably, described 3rd playpipe is provided with bypass jet, and the injection direction of described bypass jet is straight up.
A kind of have the control method that molten steel temperature controls the VD stove of device, adopts above-mentioned VD stove, and described control method includes:
Step S100: ladle is put in vacuum tank after holding the molten steel come out of the stove from LF refining furnace according to molten steel temperature setting value by ladle, uses the second temperature sensor to carry out molten steel temperature processing pre-test, obtains temperature before molten steel processes；
Step S200: use the first temperature sensor to the temperature measurement in cavity, and the temperature described first temperature sensor measured according to temperature before the process of described molten steel is demarcated, and controls the flow of air-flow in air inlet pipe and escape pipe according to demarcating meansigma methods；
Step S300: control vacuum tank and carry out evacuation, and use the first playpipe to molten steel Argon；
Step S400: keep vacuum stages, by the first temperature sensor, the temperature in cavity is carried out monitor in real time, when temperature skewness in the vertical direction in cavity, the second playpipe is used to carry out Argon, when temperature skewness in the horizontal direction in cavity, the 3rd playpipe is used to carry out Argon；Wherein, if the mean temperature change curve of cavity be positioned at setting curve threshold range, then adjust the temperature of molten steel by changing the flow of air-flow in air inlet pipe and escape pipe；If the mean temperature change curve of cavity beyond set curve threshold range, then adjust the temperature of molten steel by changing the heating power of heater；
Step S500: after vacuum breaker, is measured after molten steel temperature being processed by the second temperature sensor, obtains temperature after molten steel processes, and after being processed by molten steel, the setting value of molten steel temperature is adjusted by temperature, and carries out tapping steel.
Preferably, in described step S200, the flow of air-flow in air inlet pipe and escape pipe is controlled according to demarcating meansigma methods, specifically include: adjust the flow of air-flow in air inlet pipe and escape pipe according to relational expression Q1=k*T12, wherein, Q1 is the flow of described air-flow, and T1 is described demarcation meansigma methods, and k is proportionality coefficient.
Preferably, described step S400 also includes: when the second playpipe and/or the 3rd playpipe carry out Argon, when Argon total flow in ladle is less than or equal to the first playpipe independent Argon 120%, and the injection flow of the first playpipe accounts for more than the 50% of total flow.
Preferably, described step S400 also includes: when using the second playpipe and/or the 3rd playpipe Argon, trace Argon is carried out first by the aperture less than default opening value, it is then gradually increased argon blowing rate, again reduce flow when increasing extremely preset opening value 110%, finally make actual opening value match with default opening value.
From above technical scheme, a kind of VD stove with molten steel temperature control device of embodiment of the present invention offer and control method thereof, by the temperature in VD stove is carried out active control, improve control accuracy and the response speed of molten steel temperature of coming out of the stove, to ensure that pouring temperature is in the target range of the best, reduce smelting cost, shorten the time smelted, improve the efficiency smelted, improve the purpose of the utilization rate of the energy.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, for those of ordinary skills, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation of a kind of VD stove with molten steel temperature control device that Fig. 1 provides for the embodiment of the present invention；
The structural representation of a kind of first playpipe that Fig. 2 provides for the embodiment of the present invention；
The structural representation of a kind of second playpipe that Fig. 3 provides for the embodiment of the present invention；
The structural representation of a kind of 3rd playpipe that Fig. 4 provides for the embodiment of the present invention；
Symbol table in figure is shown as: 1, ladle；2, vacuum tank；3, liner；4, shell；5, cavity；6, air inlet pipe；7, escape pipe；8, the first playpipe；9, the second playpipe；10, the 3rd playpipe；11, the first temperature sensor；12, controller；13, the second temperature sensor；14, heater；15, helical vent pipe；16, circular ejection section；17, rectangular jet portion；18, deflector；19, bypass jet.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the technical scheme in the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, all should belong to the scope of protection of the invention.
The structural representation of a kind of VD stove with molten steel temperature control device that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1, this VD stove includes ladle 1, it is provided with cavity 5 between the liner 3 and shell 4 of ladle 1, air inlet pipe 6 and escape pipe 7 it is provided with in cavity 5, air-flow can be flowed into cavity 5 by air inlet pipe 6, escape pipe 7 flow out cavity 5, by the air-flow flowed, the molten steel in ladle 1 is carried out cooling process.In one alternative embodiment of the present invention, air inlet pipe 6 is arranged on the top of cavity 5, and escape pipe 7 is arranged on the bottom of cavity 5.
For the ease of the temperature of molten steel in detection ladle 1, two or more the first temperature sensors 11 it are additionally provided with in cavity 5, the embodiment of the present invention position is set and quantity is set is not particularly limited the first temperature sensor 11, but in order to reach better Detection results, first temperature sensor 11 is evenly distributed in cavity 5 by one preferred embodiment of the present invention, in order to the temperature of the molten steel of each position in detection ladle 1 in time.
In embodiments of the present invention, succinct in order to describe, using the centrage as ladle 1 of the line between the bottom of ladle 1 and top center point, using the direction along centrage towards ladle 1 top as straight up, with the direction of central axis as horizontal direction.
For cleaning molten steel, ladle 1 is internal is respectively equipped with the first playpipe the 8, second playpipe 9 and the 3rd playpipe 10, when holding molten steel in ladle 1, the effect of cleaning molten steel can be played by first playpipe the 8, second playpipe 9 and/or the 3rd playpipe 10 to injection argon in molten steel.
Wherein, the first playpipe 8 is arranged on the bottom centre position of ladle 1, and injection direction is straight up.
The structural representation of a kind of first playpipe that Fig. 2 provides for the embodiment of the present invention, as shown in Figure 2, in order to expand the jeting area of the first playpipe 8, it is provided with helical vent pipe 15 in first playpipe 8, argon forms spiral air flow when by helical vent pipe 15, and then make the argon of the first playpipe 8 injection form spiral air flow, expand jeting area.In a kind of alternative embodiment, the helical angle of helical vent pipe 15 can select any number 20 °-30 ° interior, and 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, towards the sidewall of ladle 1, namely tilts upward.In order to improve the uniformity of argon injection, said two or two or more the second playpipe 9 are uniformly arranged centered by the first playpipe 8, and namely the centrage of said two or the relative ladle 1 of two or more the second playpipe 9 is centrosymmetric setting.
The structural representation of a kind of second playpipe that Fig. 3 provides for the embodiment of the present invention, as shown in Figure 3, in order to improve the injection uniformity further, the two ends in the exit of the second playpipe 9 are provided with two circular ejection sections 16, being provided with rectangular jet portion 17 between said two circle ejection section 16, the outer side edges in described rectangular jet portion 17 is along being provided with the deflector 18 tilted outside rectangular jet portion 17.In an advantageous embodiment, the described circular diameter of ejection section 16 is 3:1 with the ratio of the height in described rectangular jet portion 17；The angle in described deflector 18 and described rectangular jet portion 17 is 45 °；The fan-shaped central angle of the intersection of the injection area coverage of two adjacent described second playpipes 9 is 10 °～15 °.
It is pointed out that above-mentioned data are a kind of specific implementation that the embodiment of the present invention provides, those skilled in the art can adjust accordingly according to actual needs, and it all should fall within protection scope of the present invention.For example, it is possible to the circular diameter of ejection section 16 is set to 2:1 or 4:1 with the ratio of the height in described rectangular jet portion 17；The angle of deflector 18 with rectangular jet portion 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, and the injection direction of the 3rd playpipe 10 is horizontal direction, and the injection direction of the 3rd playpipe 10 is tangent with the sidewall of ladle 1.By tangent set-up mode, it is possible to make the air-flow sidewall rotational flow along ladle 1 of the 3rd playpipe 10 injection, improve the injection uniformity.
The structural representation of a kind of 3rd playpipe that Fig. 4 provides for the embodiment of the present invention, as shown in Figure 4, the 3rd playpipe 10 is additionally provided with bypass jet 19, can be improved the jeting area of the 3rd playpipe 10 by the 3rd jet.In one preferred embodiment of the present invention, the injection direction of described bypass jet 19 is straight up.
Wherein, in first playpipe the 8, second playpipe 9 and the 3rd playpipe 10, it is provided with heater 14, when the temperature of molten steel reduces, it is possible to by adjusting the heating power of heater 14, argon is heated, and then improves the temperature of molten steel.
Additionally, the outside of ladle 1 is additionally provided with vacuum tank 2, by vacuum tank 2 evacuation, it is possible to ladle 1 to be maintained at vacuum stages, vacuum tank 2 is additionally provided with the controller 12 for controlling molten steel temperature and for detecting the second temperature sensor 13 of molten steel temperature in ladle 1.
From above technical scheme, molten steel temperature in ladle 1 can be carried out active control by the heater 14 in the air-flow in cavity 5 and first playpipe the 8, second playpipe 9 and/or the 3rd playpipe 10 by a kind of VD stove with molten steel temperature control device that the embodiment of the present invention provides, and then improve control accuracy and the response speed of molten steel temperature of coming out of the stove, to ensure that pouring temperature is in the target range of the best, reduce smelting cost, shorten the time smelted, improve 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 the control method of a kind of VD stove with molten steel temperature control device, and it mainly comprises the steps that
Step S100: ladle 1 is put in vacuum tank 2 after holding the molten steel come out of the stove from LF refining furnace according to molten steel temperature setting value by ladle 1, uses the second temperature sensor 13 to carry out molten steel temperature processing pre-test, obtains temperature before molten steel processes.
Under normal circumstances, controller 12 according to molten steel temperature setting value, the molten steel temperature come out of the stove from LF refining furnace is controlled, the molten steel come out of the stove from LF refining furnace is contained in ladle 1, then ladle 1 is put in vacuum tank 2 and be for further processing.Wherein, when being put in vacuum tank 2 by ladle 1, it is possible to use molten steel temperature is carried out processing pre-test by the second temperature sensor 13, and process pre-test herein refers to that molten steel carries out the process pre-test processed in VD stove, temperature before molten steel processes is obtained.
Step S200: use the first temperature sensor 11 that the temperature in cavity 5 is measured, and temperature temperature that described first temperature sensor 11 is measured is demarcated before processing according to described molten steel, control the flow of air-flow in air inlet pipe 6 and escape pipe 7 according to demarcating meansigma methods.
Owing to the temperature in cavity 5 can reflect the temperature of molten steel indirectly, therefore, use the first temperature sensor 11 that the temperature in cavity 5 is measured, namely be equivalent to use the first temperature sensor 11 that the temperature of molten steel is measured, then the temperature that before processing according to molten steel, the first temperature sensor 11 is measured by temperature is demarcated, control the flow of air-flow in air inlet pipe 6 and escape pipe 7 according to calibration result, and then the temperature of molten steel is adjusted.Further, since the quantity of the first temperature sensor 11 is multiple, therefore can be used as the temperature value of molten steel by the meansigma methods of temperature measured by multiple temperature sensors, namely according to demarcating the flow of air-flow in meansigma methods control air inlet pipe 6 and escape pipe 7.
Further, the corresponding relation of the flow demarcating meansigma methods and air-flow is Q1=k*T1 2, wherein, Q1For the flow of air-flow, T1For demarcating meansigma methods, k is proportionality coefficient.As can be seen from the above equation, the flow proportional of meansigma methods and air-flow is demarcated, say, that the temperature of molten steel is more high, and the flow of air-flow is more big, for accelerating to lower the temperature to molten steel；The temperature of molten steel is more low, and the flow of air-flow is more little, is used for slowing down and lowers the temperature to molten steel.
Step S300: control vacuum tank 2 and carry out evacuation, and use the first playpipe 8 to molten steel Argon.
Argon is protection gas, it is possible to cleaning molten steel, therefore after control vacuum tank 2 carries out evacuation, starts molten steel Argon.Wherein, the first playpipe 8 is used when starting Argon.
Step S400: keep vacuum stages, by the first temperature sensor 11, the temperature in cavity 5 is carried out monitor in real time, when temperature skewness in the vertical direction in cavity 5, the second playpipe 9 is used to carry out Argon, when temperature skewness in the horizontal direction in cavity 5, the 3rd playpipe 10 is used to carry out Argon；Wherein, if the mean temperature change curve of cavity 5 be positioned at setting curve threshold range, then adjust the temperature of molten steel by changing the flow of air-flow in air inlet pipe 6 and escape pipe 7；If the mean temperature change curve of cavity 5 beyond set curve threshold range, then adjust the temperature of molten steel by changing the heating power of heater 14.
Owing to the first temperature sensor 11 is evenly distributed in cavity 5, therefore by the temperature value that relatively different first temperature sensors 11 gather, namely can determine whether the uniformity of temperature profile degree of (molten steel) in cavity 5.Such as, when the temperature difference that the first temperature sensor 11 being distributed in vertical direction gathers is more than when setting threshold value, determine the temperature skewness in the vertical direction in the first cavity 5, now can pass through the second playpipe 9 and spray argon, by the argon tilted upward that the second playpipe 9 ejects, it is possible to improve the molten steel uniformity in the vertical direction.When the temperature difference that the first temperature sensor 11 being distributed in horizontal direction gathers is more than when setting threshold value, determine the temperature skewness in the horizontal direction in the first cavity 5, now can pass through the 3rd playpipe 10 and spray argon, by the argon of the horizontal direction that the 3rd playpipe 10 ejects, it is possible to improve the molten steel uniformity in the horizontal direction.
Wherein, in order to improve the stationarity of temperature adjusting, when the second playpipe 9 and/or the 3rd playpipe 10 carry out Argon, 120% when the Argon total flow in ladle 1 is less than or equal to the first playpipe 8 independent Argon, and the injection flow of the first playpipe 8 accounts for more than the 50% of total flow；When using the second playpipe 9 and/or the 3rd playpipe 10 Argon, trace Argon is carried out first by the aperture less than default opening value, it is then gradually increased argon blowing rate, again reduces flow when increasing extremely preset opening value 110%, finally make actual opening value match with default opening value.
If it addition, the mean temperature change curve of cavity 5 be positioned at setting curve threshold range, then adjust the temperature of molten steel by changing the flow of air-flow in air inlet pipe 6 and escape pipe 7；If the mean temperature change curve of cavity 5 beyond set curve threshold range, then adjust the temperature of molten steel by changing the heating power of heater 14.The heating power of heater 14 adjusts amplitude adoption rate-differential regulation relation, and wherein ratio adjusts the reference object of relation is the range of temperature in cavity 5, and the reference object of differential regulation relation is that in ladle 1, Argon total flow adjusts amplitude.
Step S500: after vacuum breaker, is measured after molten steel temperature being processed by the second temperature sensor 13, obtains temperature after molten steel processes, and after being processed by molten steel, the setting value of molten steel temperature is adjusted by temperature, and carries out tapping steel.
Has processed every time after, before using the process that the second temperature sensor 13 gathers, after temperature and process, molten steel temperature setting value is carried out secondary adjustment by temperature.Adjustment process adopts multi-variable system, the variable wherein selected may include that 1 stove of ladle is by molten steel soak time, on ladle 1, stove is by molten steel soak time, ladle 1 cool time, stove cool time on ladle 1, VD initial temperature, the VD initial thermometric moment to VD start the fine vacuum moment, VD fine vacuum retention time, VD uncapped to 13 factors such as thermometric moment, tap, liquidus temperature, VD process Argon amount, VD tank cool time and upper stove use time after uncapping.
After variable selection completes, set up the measurement result of the second temperature sensor 13 through each variable then to the transmission function adjusting target, by the measurement result calculating through transmission function, and after carrying out weighted average, obtain secondary and adjust result.Transmission function adopts discrete vertical simulation, then passes through linear regression method and obtains.
From above technical scheme, the embodiment of the present invention is by the temperature survey in the front and back and vacuum of VD stove refine, the molten steel temperature of VD stove is carried out monitoring in real time and adjusts, change the state that in prior art, in VD stove refining process, molten steel temperature passively reduces, by controlling the flow of Argon mode and cavity air-flow, carry out the reduction of molten steel temperature intervening actively, drastically increase the promptness that molten steel temperature is regulated, temperature fluctuation for occurring in VD stove refining process can regulate rapidly accordingly, thus significantly improving the control accuracy of molten steel tapping temperature.
It should be noted that, in this article, the such as relational terms of " first " and " second " or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
The above is only the specific embodiment of the present invention, makes to skilled artisans appreciate that or realize the present invention.The multiple amendment of these embodiments be will be apparent to one skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (12)
1. a VD stove with molten steel temperature control device, it is characterized in that, including ladle (1), it is provided with cavity (5) between liner (3) and the shell (4) of described ladle (1), it is provided with air inlet pipe (6), escape pipe (7) and two or more the first temperature sensors (11), said two or two or more the first temperature sensor (11) in described cavity (5) to be evenly distributed in described cavity (5)；
The bottom of described ladle (1) inner side is provided with first playpipe (8) and two or more the second playpipes (9), said two or two or more the second playpipe (9) are uniformly arranged centered by described first playpipe (8), the injection direction of described first playpipe (8) is straight up, the injection direction of described second playpipe (9) is towards the sidewall of described ladle (1), the sidewall of described ladle (1) inner side is additionally provided with the 3rd playpipe (10), the injection direction of described 3rd playpipe (10) is horizontal direction, and the injection direction of described 3rd playpipe (10) is tangent with the sidewall of described ladle (1), described first playpipe (8), it is provided with heater (14) in second playpipe (9) and the 3rd playpipe (10)；
The outside of described ladle (1) is additionally provided with vacuum tank (2), and described vacuum tank (2) is provided with controller (12) and is used for detecting second temperature sensor (13) of ladle (1) interior molten steel temperature.
2. VD stove according to claim 1, it is characterised in that be provided with helical vent pipe (15) in described first playpipe (8).
3. VD stove according to claim 2, it is characterised in that the helical angle of described helical vent pipe (15) is 26 °.
4. VD stove according to claim 1, it is characterized in that, the two ends in the exit of described second playpipe (9) are provided with two circular ejection sections (16), being provided with rectangular jet portion (17) between said two circle ejection section (16), the outer side edges of described rectangular jet portion (17) is along being provided with the deflector (18) tilted to rectangular jet portion (17) outside.
5. VD stove according to claim 4, it is characterised in that the described diameter of circular ejection section (16) is 3:1 with the ratio of the height of described rectangular jet portion (17).
6. VD stove according to claim 4, it is characterised in that the angle of described deflector (18) and described rectangular jet portion (17) is 45 °.
7. VD stove according to claim 1, it is characterised in that the fan-shaped central angle of the intersection of the injection area coverage of two adjacent described second playpipes (9) is 10 °～15 °.
8. VD stove according to claim 1, it is characterised in that described 3rd playpipe (10) is provided with bypass jet (19), and the injection direction of described bypass jet (19) is straight up.
9. one kind has the control method that molten steel temperature controls the VD stove of device, it is characterised in that adopting the VD stove described in any one of claim 1-8, described control method includes:
Step S100: after ladle (1) holds the molten steel come out of the stove from LF refining furnace according to molten steel temperature setting value, ladle (1) is put in vacuum tank (2), use the second temperature sensor (13) to carry out molten steel temperature processing pre-test, obtain temperature before molten steel processes；
Step S200: use the first temperature sensor (11) that the temperature in cavity (5) is measured, and temperature temperature that described first temperature sensor (11) is measured is demarcated before processing according to described molten steel, according to the flow demarcating meansigma methods and controlling air inlet pipe (6) and escape pipe (7) interior air-flow；
Step S300: control vacuum tank (2) and carry out evacuation, and use the first playpipe (8) to molten steel Argon；
Step S400: keep vacuum stages, by the first temperature sensor (11), the temperature in cavity (5) is carried out monitor in real time, when temperature skewness in the vertical direction in cavity (5), the second playpipe (9) is used to carry out Argon, when temperature skewness in the horizontal direction in cavity (5), the 3rd playpipe (10) is used to carry out Argon；Wherein, if the mean temperature change curve of cavity (5) be positioned at setting curve threshold range, then by change air inlet pipe (6) and escape pipe (7) interior air-flow flow adjustment molten steel temperature；If the mean temperature change curve of cavity (5) beyond set curve threshold range, then adjust the temperature of molten steel by the heating power of change heater (14)；
Step S500: after vacuum breaker, is measured after molten steel temperature being processed by the second temperature sensor (13), obtains temperature after molten steel processes, and after being processed by molten steel, the setting value of molten steel temperature is adjusted by temperature, and carries out tapping steel.
10. method according to claim 9, it is characterised in that in described step S200, according to the flow demarcating meansigma methods control air inlet pipe (6) and escape pipe (7) interior air-flow, specifically includes:
According to relational expression Q1=k*T1 2Adjust the flow of air inlet pipe (6) and escape pipe (7) interior air-flow, wherein, Q1For the flow of described air-flow, T1For described demarcation meansigma methods, k is proportionality coefficient.
11. method according to claim 9, it is characterised in that described step S400 also includes:
When the second playpipe (9) and/or the 3rd playpipe (10) carry out Argon, when Argon total flow in ladle (1) is less than or equal to the first playpipe (8) individually Argon 120%, and the injection flow of the first playpipe (8) accounts for more than the 50% of total flow.
12. method according to claim 9, it is characterised in that described step S400 also includes:
When using the second playpipe (9) and/or the 3rd playpipe (10) Argon, trace Argon is carried out first by the aperture less than default opening value, it is then gradually increased argon blowing rate, again reduce flow when increasing extremely preset opening value 110%, finally make actual opening value match with default opening value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111122768A (en) * | 2020-01-14 | 2020-05-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Ladle baking air-fuel ratio configuration method |
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