A method for improving the problem of molten steel aspiration during converter steelmaking and tapping

Abstract

The present invention provides a method for improving the problem of molten steel aspiration during the steelmaking and tapping process of a converter, specifically comprising: S1, arranging a lifting device under the ladle; S2, while the molten steel is added to the ladle, the deoxidizing alloy and component alloy to be added are melted into liquid by an alloy melting device, and then the fusible deoxidizing alloy and component alloy are added into the ladle by an alloy liquid adding device. The present invention arranges a lifting device under the ladle, and controls the intelligent descent of the ladle by the lifting device during the steel tapping process, so that a proper distance is always maintained between the steel outlet of the molten steel outflow pipe and the liquid surface in the ladle, thereby reducing the occurrence of molten steel aspiration. While the molten steel is added to the ladle, the deoxidizing alloy and component alloy to be added are melted into liquid by the alloy melting device, and then added into the ladle, thereby achieving accurate and rapid addition of the deoxidizing alloy and component alloy, thereby shortening the steel tapping time and further reducing the molten steel aspiration phenomenon.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking, and in particular to a method for improving the problem of molten steel aspiration during converter steelmaking and tapping. Background Art

[0002] During the steelmaking process of the converter, when the converter steelmaking is finished and the steel is tapped, Figure 1 As shown, the ladle 3 containing molten steel is transported to the bottom of the converter 1 by a ladle transfer vehicle, and then the steel outlet of the molten steel outflow pipe 2 on the converter 1 is opened, and the converter is slowly shaken so that the molten steel 5 in the converter 1 can be poured out from the steel outlet. Since there is a certain height difference between the steel outlet of the molten steel outflow pipe 2 and the ladle 3, and the molten steel 5 is in contact with the air for normal pressure tapping, the molten steel 5 will absorb gas from the air, causing the gas content in the molten steel 5 to increase; when the temperature of the tapping molten steel is too high, the higher the temperature of the molten steel, the greater the solubility of the gas in the molten steel, making it easier for the molten steel 5 to absorb gas. And in the process of molten steel 5 flowing out, the steel outlet of molten steel outflow pipe 2 and the liquid level in ladle 3 (the liquid level in ladle 3 will gradually rise) will gradually approach each other. In the process of the liquid level in ladle 3 and the steel outlet of converter molten steel outflow pipe 2 gradually approaching each other, under high temperature and high pressure, serious molten steel aspiration will occur, and as the liquid level in ladle 3 and the steel outlet of converter molten steel outflow pipe 2 get closer and closer, the molten steel aspiration will become more and more serious. After molten steel aspiration, not only will the output of molten steel decrease, but also the quality of molten steel and the alloy yield rate when alloying during steel tapping will be seriously affected. Severe aspiration will also cause the degassing smelting burden of the subsequent process of converter steelmaking outside the furnace refining, increasing the cost of steelmaking.

[0003] In addition, during the steel-making process, it is necessary to carry out deoxidation alloying and fine-tuning of alloy composition in the ladle, that is, the alloy used for deoxidation and alloy for adjusting composition are added when 1 / 4 of the molten steel flows out, and the addition is completed when 3 / 4 of the molten steel flows out. In order to ensure that the alloy is melted and stirred evenly, the alloy is added to the part where the molten steel impacts. In order to fully melt the added alloy during the steel-making process, the steel-making time needs to be extended, which will significantly increase the gas content in the molten steel, making the steel-making gas absorption phenomenon more serious. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a method for improving the problem of molten steel aspiration during the steelmaking and tapping process of a converter. A lifting device is arranged under the ladle, and the ladle is controlled to descend intelligently by the lifting device during the steel tapping process, so that an appropriate distance is always maintained between the steel outlet of the molten steel outflow pipe and the liquid surface in the ladle, thereby reducing the occurrence of molten steel aspiration. While the molten steel is added to the ladle, the deoxidation alloy and component alloy to be added are melted into a liquid state by an alloy melting device, and then the fusible deoxidation alloy and component alloy are added to the ladle by an alloy liquid adding device, thereby achieving accurate and rapid addition of the fusible deoxidation alloy and component alloy, shortening the steel tapping time, and further reducing the molten steel aspiration phenomenon.

[0005] In order to realize the above technical solution, the present invention provides a method for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping, which specifically comprises the following steps:

[0006] S1. A lifting device is provided under the ladle, and the speed at which the lifting device pushes the ladle down is controlled by the following method:

[0007] S11. According to formula 1, the speed at which the molten steel falls from the outlet of the molten steel outlet pipe to the ladle is obtained:

[0008] V t 2 -V0 2 =2gS Formula 1

[0009] Among them, V t is the speed of the molten steel falling into the ladle, V0 is the initial speed of the molten steel when it flows out of the molten steel outlet pipe, S is the distance between the molten steel outlet pipe and the bottom of the ladle, g = 9.8m / s 2 ;

[0010] S12, with the speed V obtained t As an electrical signal, the PID control method is used as the core control system of the lifting device. A series of operations are performed on the quantitative quantities involved in the control process and the feedback quantities of the controlled object, and the speed is controlled by the calculation results. The specific method is: the control system uses V t As the input quantity, a voltage signal is generated, represented by U0, which includes two feedback links. One is that when the signal is transmitted to the reducer, the encoder detects the actual speed and sends the feedback signal U f The other is that when the signal propagates to the end of the model, the voltage drop of the busbar will generate a feedback signal ΔU which is input to the comparison unit, and they are calculated with the input signal to obtain the deviation signal U e , and then the deviation signal U e As the system input, it is transmitted through the controller, three-phase asynchronous motor, reducer and gear rack, and finally transmitted to the lifting platform, which controls the speed of the ladle.

[0011] S2. While the molten steel is being added to the ladle, the deoxidizing alloy and component alloy to be added are melted into liquid by the alloy melting device, and then the fusible deoxidizing alloy and component alloy are added to the ladle by the alloy liquid adding device, and the addition amount of the fusible deoxidizing alloy and component alloy is controlled by the following method:

[0012] S21, obtaining the initial oxygen content, initial alloy content, and target alloy content of the molten steel;

[0013] S22. Calculate the amount of deoxidized alloy raw material added, where the amount of deoxidized alloy added is mainly related to the initial oxygen content of the molten steel, the deoxidation method, and the purity and yield of the deoxidized alloy. The deoxidation model formula is shown in Formula 2:

[0014]

[0015] Where: M1 is the amount of deoxidized alloy added, k is the deoxidation coefficient, p is the oxygen content in molten steel, G is the total amount of molten steel, q is the alloy purity, and f is the alloy yield;

[0016] S23, calculating the amount of alloy raw materials added;

[0017] S24, calculating the total content of molten steel components according to the amount of alloy raw materials added;

[0018] S25. Whether the measured and predicted values ​​are within the target range;

[0019] S26. Add fusible deoxidizing alloy and component alloy into the ladle through a metering pump according to the calculated amount of deoxidizing alloy added and the amount of component alloy raw material added.

[0020] Preferably, in step S12, the specific control process is: according to the actual input voltage requirement of the drive motor, the desired supply voltage U0(s) is set, and the output voltage U0(s) is obtained by adjusting the PID control of the inverter in the control system. i (s), after passing through the three-phase asynchronous motor, the output speed is W1(s), and then through the reducer to obtain the speed W2(s), and finally through the gear rack to output the running displacement L(s) of the cage. There are two feedback signals in the system block diagram, one is the encoder feedback signal U after the reducer f (s), and the other is the feedback signal ΔU(s) generated by the busbar. The feedback signals are input into the comparison unit and compared with the expected supply voltage U0(s) to obtain the deviation voltage U e (s), and input the deviation voltage into the control system, thereby realizing the input voltage adjustment and running speed control of the lifting device drive motor.

[0021] Preferably, in step S23, the addition amount of the component alloy is calculated specifically in the following manner:

[0022] First, set the target content a i The values ​​are:

[0023]

[0024] Then, according to the element balance,

[0025] a i G = b i ·G+m i ·c ji ·f i Formula 4

[0026] Where: m i = is: the amount of alloy j to adjust element i to reach the target content, kg; b i is the initial content of element i in the incoming molten steel; G is the weight of molten steel, kg; c ji is the percentage of element i in alloy j; f i is the yield of the element; a i Fine-tune the target value of element i in the molten steel for alloying;

[0027] Then, we can rearrange Formula 2 to obtain

[0028]

[0029] Through the above formula, the amount of various alloy raw materials added to fine-tune each component can be obtained. i , and calculate the total amount of alloy raw materials M2 required to adjust the composition,

[0030]

[0031] Preferably, in step S24, the total content of molten steel components is calculated according to Formula 7:

[0032] M 总 =G+M 21 +M2 Formula 7.

[0033] Preferably, in step S25, whether the measured and predicted values ​​meet the target range is determined by:

[0034] First, the endpoint component a i,cal Do the first round of calculations:

[0035]

[0036] Then, a i,cal with a i,min , ai,max For comparison, if a i,cal In a i,min , a i,max If the requirements are met, the model will output according to the above calculation results. If it is outside the range, a i,cal As the initial content of the incoming molten steel component i, the component alloy is added and the calculation is repeated until the requirement is met.

[0037] Preferably, the method further comprises arranging the molten steel outflow pipe of the converter into a curved shape.

[0038] The method provided by the present invention for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping has the following beneficial effects:

[0039] 1) The present invention arranges a lifting device under the ladle, and controls the ladle to drop the molten steel into the ladle at a speed V during the steel tapping process. t As a control signal, the PID control method is used to control the ladle to intelligently descend at a speed matching the descending speed of the molten steel, so that an appropriate distance is always maintained between the steel outlet of the molten steel outlet pipe and the liquid level in the ladle, avoiding serious steel liquid suction phenomenon due to the gradual approach between the steel outlet of the molten steel outlet pipe and the liquid level in the ladle during the outflow of molten steel.

[0040] 2) When adding molten steel into the ladle, the present invention uses an alloy melting device to melt the deoxidizing alloy and the component alloy to be added into a liquid state by accurately calculating the addition amount of the deoxidizing alloy and the component alloy, thereby realizing the early preheating and melting of the deoxidizing alloy and the component alloy, and then adding the fusible deoxidizing alloy and the component alloy into the ladle through the alloy liquid adding device, thereby realizing the accurate and rapid addition of the fusible deoxidizing alloy and the component alloy, which can shorten the steel tapping time and further reduce the steel liquid air absorption phenomenon.

[0041] 3) The present invention can reduce the scouring of the outlet of the molten steel outlet pipe by the molten steel by setting the molten steel outlet pipe into a curved shape, reduce the occurrence of turbulence, and further reduce the phenomenon of molten steel suction. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of steelmaking and steelmaking in a converter in the prior art.

[0043] Figure 2 It is a structural schematic diagram of the present invention.

[0044] In the figure: 1. converter; 2. molten steel outflow pipe; 3. ladle; 4. ladle transfer vehicle; 5. molten steel; 6. lifting device; 7. alloy melting device; 8. molten alloy adding device. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0046] Embodiment: A method for improving the problem of molten steel aspiration during converter steelmaking and tapping.

[0047] Reference Figure 1 and Figure 2 As shown, a method for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping process specifically comprises:

[0048] (i) A lifting device 6 is provided below the ladle 3 to make the static ladle 3 movable, so that the ladle 3 has adaptability. During the tilting and tapping process of the converter 1, the ladle 3 containing the molten steel 5 is lowered so that the distance between the liquid level in the ladle 3 and the outlet of the molten steel outflow pipe 2 is always kept constant, thereby avoiding the situation that during the outflow of the molten steel 5, the outlet of the molten steel outflow pipe 2 and the liquid level in the ladle 3 (the liquid level in the ladle 3 will gradually rise) gradually approach each other, thereby avoiding the situation that during the gradual approach of the liquid level in the ladle 3 and the outlet of the converter molten steel outflow pipe 2, serious molten steel aspiration occurs under high temperature and high pressure.

[0049] In the above technical solution, how to match the ladle descent speed with the molten steel discharge speed, so as to keep the distance between the liquid level in the ladle 3 and the outlet of the molten steel outlet pipe 2 constant, is a key problem to be solved in this field. To solve the above problem, the present invention controls the speed at which the lifting device drives the ladle to descend in the following manner:

[0050] First, according to production experience, before the molten steel 5 is discharged from the molten steel outflow pipe 2 of the converter 1, the ladle 3 is lifted to a suitable height by the lifting device 6. Under this height, when the molten steel 5 falls into the ladle 3, there will be no or only a weak molten steel suction phenomenon.

[0051] Then, the speed at which the molten steel falls from the outlet of the molten steel outlet pipe to the ladle is obtained according to Formula 1:

[0052] V t 2 -V0 2 =2gS Formula 1

[0053] Among them, V t is the speed of the molten steel falling into the ladle, V0 is the initial speed of the molten steel when it flows out of the molten steel outlet pipe, S is the distance between the molten steel outlet pipe and the bottom of the ladle, g = 9.8m / s 2In the actual operation process, as the molten steel continuously falls into the ladle, the distance between the molten steel outflow pipe and the bottom of the ladle is continuously reduced. Therefore, according to Formula 1, in order to keep the distance between the molten steel outflow pipe and the bottom of the ladle constant, V t is a constantly changing value, and then by V t The conversion control can realize the control of S.

[0054] Therefore, in the actual control process, the speed V t As an electrical signal, the PID control method is used as the core control system of the lifting device. A series of operations are performed on the quantitative quantities involved in the control process and the feedback quantities of the controlled object, and the speed is controlled by the calculation results. The specific method is: the control system uses V t As the input quantity, a voltage signal is generated, represented by U0, which includes two feedback links. One is that when the signal is transmitted to the reducer, the encoder detects the actual speed and sends the feedback signal U f The other is that when the signal propagates to the end of the model, the voltage drop of the busbar will generate a feedback signal ΔU which is input to the comparison unit, and they are calculated with the input signal to obtain the deviation signal U e , and then the deviation signal U e As the system input, it is transmitted through the controller, three-phase asynchronous motor, reducer and gear rack, and finally transmitted to the lifting platform, which controls the speed of the ladle.

[0055] The specific control process is: t As an electrical signal, according to the actual input voltage requirement of the drive motor, the desired supply voltage U0(s) is set, and the output voltage U is obtained by adjusting the PID control of the inverter in the control system. i (s), after passing through the three-phase asynchronous motor, the output speed is W1(s), and then through the reducer to obtain the speed W2(s), and finally through the gear rack to output the running displacement L(s) of the cage. There are two feedback signals in the system block diagram, one is the encoder feedback signal U after the reducer f (s), and the other is the feedback signal ΔU(s) generated by the busbar. The feedback signals are input into the comparison unit and compared with the expected supply voltage U0(s) to obtain the deviation voltage U e (s), and input the deviation voltage into the control system, thereby realizing the input voltage adjustment and running speed control of the lifting device drive motor.

[0056] The present invention arranges a lifting device under the ladle, and controls the ladle to drop the molten steel into the ladle at a speed V during the steel tapping process. tAs a control signal, the PID control method is used to control the ladle to intelligently descend at a speed matching the descending speed of the molten steel, so that an appropriate distance is always maintained between the steel outlet of the molten steel outlet pipe and the liquid level in the ladle, avoiding serious steel liquid suction phenomenon due to the gradual approach between the steel outlet of the molten steel outlet pipe and the liquid level in the ladle during the outflow of molten steel.

[0057] (ii) In the actual production process of converter steelmaking, it is necessary to add deoxidizing alloys and component alloys according to production requirements in order to control the composition of molten steel and deoxidize. The accuracy of alloy addition is directly related to the quality of molten steel. If the amount of alloy added does not meet the requirements, it will cause waste of resources at best and serious production accidents at worst. Accurate addition of alloy raw materials is a prerequisite for ensuring the quality of steel and an important means to reduce production costs. The accuracy of feeding and the speed of feeding seriously affect product quality and production efficiency. However, in order to fully melt the added alloy during the steelmaking process, the steelmaking time needs to be extended, which will significantly increase the gas content in the molten steel, thereby making the steelmaking gas absorption phenomenon more serious.

[0058] In order to solve the above problems, the present invention melts the deoxidizing alloy and component alloy to be added into liquid state through an alloy melting device while adding molten steel into the ladle, thereby realizing preheating and melting of the deoxidizing alloy and the component alloy in advance, and then adds the fusible deoxidizing alloy and the component alloy into the ladle through the alloy liquid adding device. In this way, even if the deoxidizing alloy and the component alloy are added in a short time, the melting of the deoxidizing alloy and the component alloy is not affected, thereby shortening the steel tapping time, reducing the time for the molten steel to contact with the air, and thereby reducing the air absorption phenomenon of the molten steel.

[0059] In order to improve the addition accuracy of deoxidizing alloy and component alloy, the addition amount of fusible deoxidizing alloy and component alloy is controlled by the following method:

[0060] (1) Obtaining the initial oxygen content, initial alloy content, and target alloy content of the molten steel; wherein the initial oxygen content, target oxygen content, deoxidation method, initial alloy content, and target component content of the molten steel can all be obtained based on the current steel grade dictionary for smelting molten steel.

[0061] (2) Calculate the amount of deoxidized alloy raw material added, where the amount of deoxidized alloy added is mainly related to the initial oxygen content of the molten steel, the deoxidation method, and the purity and yield of the deoxidized alloy. The deoxidation model formula is shown in Formula 2:

[0062]

[0063] Among them: M1 is the amount of deoxidized alloy added, k is the deoxidation coefficient, p is the oxygen content in molten steel, G is the total amount of molten steel, q is the alloy purity, and f is the alloy yield. In the current smelting production, the deoxidation methods of molten steel mainly include Al deoxidation or SiMn deoxidation, and the main deoxidation alloy raw materials, i.e. deoxidizers, are Al alloys and SiMn alloys.

[0064] (3) Calculate the amount of alloy raw materials to be added; the alloy composition is to determine the components that need to be fine-tuned during the refining process on the premise of determining the initial composition and target composition of the molten steel, and select the appropriate alloy type and alloy raw material weight to complete the molten steel composition adjustment.

[0065] The present invention specifically calculates the addition amount of the component alloy in the following manner:

[0066] First, set the target content a i The values ​​are:

[0067]

[0068] Then, according to the element balance,

[0069] a i G = b i ·G+m i ·c ji ·f i Formula 4

[0070] Where: m i = is: the amount of alloy j to adjust element i to reach the target content, kg; b i is the initial content of element i in the incoming molten steel; G is the weight of molten steel, kg; c ji is the percentage of element i in alloy j; f i is the yield of the element; a i Fine-tune the target value of element i in the molten steel for alloying;

[0071] Then, we can rearrange Formula 2 to obtain

[0072]

[0073] Through the above formula, the amount of various alloy raw materials added to fine-tune each component can be obtained. i , and calculate the total amount of alloy raw materials M2 required to adjust the composition,

[0074]

[0075] (4) The total content of molten steel components is calculated by the amount of alloy raw materials added. The total content of molten steel components is calculated according to Formula 7:

[0076] M 总=G+M 21 +M2 Formula 7.

[0077] (5) Whether the measured and predicted values ​​are within the target range, specifically whether the measured and predicted values ​​are within the target range by the following methods:

[0078] First, the endpoint component a i,cal Do the first round of calculations:

[0079]

[0080] Then, a i,cal with a i,min , a i,max For comparison, if a i,cal In a i,min , a i,max If the requirements are met, the model will output according to the above calculation results. If it is outside the range, a i,cal As the initial content of the incoming molten steel component i, the component alloy is added and the calculation is repeated until the requirement is met.

[0081] (6) Adding fusible deoxidizing alloy and component alloy into the ladle through a metering pump according to the calculated amount of deoxidizing alloy added and the amount of component alloy raw materials added.

[0082] The present invention uses an alloy melting device to melt the deoxidizing alloy and the component alloy to be added into a liquid state by accurately calculating the addition amount of the deoxidizing alloy and the component alloy when the molten steel is added into the ladle, thereby realizing the early preheating and melting of the deoxidizing alloy and the component alloy, and then adding the fusible deoxidizing alloy and the component alloy into the ladle through the alloy liquid adding device, thereby realizing the accurate and rapid addition of the fusible deoxidizing alloy and the component alloy, shortening the steel tapping time, and further reducing the steel liquid air absorption phenomenon.

[0083] Reference Figure 2 As shown, the present invention can also reduce the scouring of the molten steel on the outlet of the molten steel outlet pipe by arranging the molten steel outlet pipe 2 into a curved shape, reduce the occurrence of turbulence, and further reduce the molten steel suction phenomenon.

[0084] The above description is only a preferred embodiment of the present invention, but the present invention should not be limited to the contents disclosed in the embodiment and the drawings, so any equivalent or modification completed without departing from the spirit disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for improving the problem of molten steel aspiration during converter steelmaking and tapping, characterized in that The specific steps include: S1. A lifting device is provided under the ladle, and the speed at which the lifting device pushes the ladle down is controlled by the following method: S11. According to formula 1, the speed at which the molten steel falls from the outlet of the molten steel outlet pipe to the ladle is obtained: V t 2 -V0 2 =2gS Formula 1 Among them, V t is the speed of the molten steel falling into the ladle, V0 is the initial speed of the molten steel when it flows out of the molten steel outlet pipe, S is the distance between the molten steel outlet pipe and the bottom of the ladle, g = 9.8m / s 2 ; S12, with the speed V obtained t As an electrical signal, the PID control method is used as the core control system of the lifting device. A series of operations are performed on the quantitative quantities involved in the control process and the feedback quantities of the controlled object, and the speed is controlled by the calculation results. The specific method is: the control system uses V t As the input quantity, a voltage signal is generated, represented by U0, which includes two feedback links. One is that when the signal is transmitted to the reducer, the encoder detects the actual speed and sends the feedback signal U f The other is that when the signal propagates to the end of the model, the voltage drop of the busbar will generate a feedback signal ΔU which is input to the comparison unit, and they are calculated with the input signal to obtain the deviation signal U e , and then the deviation signal U e As the system input, it is transmitted through the controller, three-phase asynchronous motor, reducer and gear rack, and finally transmitted to the lifting platform, which controls the speed of the ladle. S2. While the molten steel is being added to the ladle, the deoxidizing alloy and component alloy to be added are melted into liquid by the alloy melting device, and then the fusible deoxidizing alloy and component alloy are added to the ladle by the alloy liquid adding device, and the addition amount of the fusible deoxidizing alloy and component alloy is controlled by the following method: S21, obtaining the initial oxygen content, initial alloy content, and target alloy content of the molten steel; S22. Calculate the amount of deoxidized alloy raw material added, where the amount of deoxidized alloy added is mainly related to the initial oxygen content of the molten steel, the deoxidation method, and the purity and yield of the deoxidized alloy. The deoxidation model formula is shown in Formula 2: Where: M1 is the amount of deoxidized alloy added, k is the deoxidation coefficient, p is the oxygen content in molten steel, G is the total amount of molten steel, q is the alloy purity, and f is the alloy yield; S23, calculating the amount of alloy raw materials added; S24, calculating the total content of molten steel components according to the amount of alloy raw materials added; S25. Whether the measured and predicted values ​​are within the target range; S26. Add fusible deoxidizing alloy and component alloy into the ladle through a metering pump according to the calculated amount of deoxidizing alloy added and the amount of component alloy raw material added.

2. The method for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping according to claim 1, characterized in that: In step S12, the specific control process is: according to the actual input voltage requirement of the drive motor, the desired supply voltage U0(s) is set, and the output voltage U0(s) is obtained by adjusting the PID control of the inverter in the control system. i (s), after passing through the three-phase asynchronous motor, the output speed is W1(s), and then through the reducer to obtain the speed W2(s), and finally through the gear rack to output the running displacement L(s) of the cage. There are two feedback signals in the system block diagram, one is the encoder feedback signal U after the reducer f (s), and the other is the feedback signal ΔU(s) generated by the busbar. The feedback signals are input into the comparison unit and compared with the expected supply voltage U0(s) to obtain the deviation voltage U e (s), and input the deviation voltage into the control system, thereby realizing the input voltage adjustment and running speed control of the lifting device drive motor.

3. The method for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping according to claim 1, characterized in that: In step S23, the addition amount of the component alloy is calculated specifically in the following manner: First, set the target content a i The values ​​are: Then, according to the element balance, a i ·G = b i ·G + m i ·c ji ·f i Formula 4 Where: m i = is: the amount of alloy j to adjust element i to reach the target content, kg; b i is the initial content of element i in the incoming molten steel; G is the weight of molten steel, kg; c ji is the percentage of element i in alloy j; f i is the yield of the element; a i Fine-tune the target value of element i in the molten steel for alloying; Then, we can rearrange Formula 2 to obtain Through the above formula, the amount of various alloy raw materials added to fine-tune each component can be obtained. i , and calculate the total amount of alloy raw materials M2 required to adjust the composition, 4. The method for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping as claimed in claim 3, characterized in that: In step S24, the total content of molten steel components is calculated according to formula 7: M 总 =G+M 21 +M2 Formula 7.

5. The method for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping as claimed in claim 4, characterized in that: In step S25, whether the measured and predicted values ​​meet the target range is determined by: First, the endpoint component a i,cal Do the first round of calculations: Then, a i,cal with a i,min , a i,max For comparison, if a i,cal In a i,min , a i,max If the requirements are met, the model will output according to the above calculation results. If it is outside the range, a i,cal As the initial content of the incoming molten steel component i, the component alloy is added and the calculation is repeated until the requirement is met.

6. The method for improving the problem of molten steel aspiration during converter steelmaking and steel-tapping as claimed in claim 1, characterized in that: The method also includes setting the molten steel outflow pipe of the converter into a curved shape.

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