KR20120038251A - Refining apparatus of molten steel - Google Patents

Abstract

PURPOSE: A refining apparatus of molten steel capable of preventing the operation difference of workers is provided to automate a ladle furnace process by determining the input quantity of alloy iron by the kinds of steel. CONSTITUTION: A refining apparatus(10) of molten steel includes a temperature controller(20), a stirrer(30), a sampling device(40), an alloy iron injector(50), an MES(manufacturing execution system)(60), and an HMI(human machine interface)(62). The temperature controller controls the temperature of the molten steel in a ladle(12). The stirrer mixes the molten steel. The sampling device analyzes the component of the molten steel. The alloy iron injector injects alloy iron into the ladle for controlling the component of the molten steel. The MES saves processing information of a converter and a molten steel preliminary treatment site. The HMI analyzes the component of the molten steel using the sampling device, and calculates the injection amount of the alloy iron by comparing the obtained component values from the molten steel and the MES.

Description

Molten Steel Refinery {REFINING APPARATUS OF MOLTEN STEEL}

The present invention relates to a molten steel refining apparatus and a control method thereof capable of automating the LF process for refining molten steel.

In general, the LF (Ladle Funarce) process includes processes such as impurity separation, elevated temperature, degassing, and component adjustment.

In the case of general steel in the LF process, after the converter refining work is completed, bubbling is performed in Bubbling Aluminum Power (BAP) to homogenize the components, and then the ladle is moved to the L by using a crane. do. When the ladle arrives at the treatment position, the worker starts bottom bubbling after the treatment starts.

After the bottom bubbling is started for a predetermined time in the ladle, a sampling operation is performed to confirm the temperature measurement and the component of the molten steel stored in the ladle.

If the temperature of the molten steel measured in the sampling operation is the upper limit compared to the required temperature, the cooling is performed by using a coolant. When the temperature is low, the heating operation is performed by using the electrode. When the component performance of the molten steel comes out while the worker performs bottom bubbling, each component is checked, and when the component of the molten steel is lower than the component performance, the ferroalloy is introduced.

When the ferroalloy is completed, the top lance is lowered and bubbling is performed to uniformize the components. When the ferroalloy is added and the operator checks the loose state of the ferroalloy in the ladle and completely dissolves it, measurement and sampling are performed after a predetermined time. After sampling, the operator continues to bubbling and checks the component performance when the component results are released. When the component hits the target, it measures the temperature of the molten steel and completes the processing work when the temperature of the molten steel reaches the starting temperature of the RF. If the molten steel is out of the range of components, the ferrous alloy is added again to complete the treatment.

In the production of reservoir steel, the ladle arrives at the LF to begin treatment. Bottom bubbling is started at the start of the processing. In addition, the operator checks the sulfur (S: sulfur) in the molten steel pretreatment plant, and if it falls outside the upper limit of the composition, it enters quicklime as soon as it arrives, and injects aluminum into the slag of the reducing atmosphere. ) To prepare. Then, the sampling operation is performed while measuring the temperature of the molten steel over a predetermined processing time. When the temperature of the molten steel is low, the temperature raising operation is performed using the electrode like the general steel, and when the molten steel is high, the molten steel is cooled.

When the analysis of the molten steel is completed and received, the operator weighs the ferroalloys of elements that are not within the composition range and simultaneously performs top-bubbling while injecting ferroalloys through the input hopper. The top bubbling operation analyzes the components by sampling after a predetermined time when the melting of the ferroalloy is completed. When the analyzed component record is received, the operator checks whether each element is within the component range. If the whole ingredient is within the range of the steel (Ca) inoculation if the worker is inoculated by injecting calcium wire into the ladle, the dosage will vary depending on the steel type. If the component does not fall within the range, the ferroalloy is continuously weighed and the ferroalloy is added to continue processing.

In the related art, this process is performed manually by an operator, and accordingly, the following problems may occur.

That is, in the related art, since the LF processing work is performed manually by an operator, a deviation may occur for each worker. In addition, in the related art, since the ferroalloy is manually input by an operator, an error may be generated in which the ferroalloy of another element is added in basis weight by an operator miss. In addition, in the case of storage steel, it is important to keep aluminum in molten steel high in order to prepare slag in a reducing atmosphere, but this work is progressed depending on the experience of the workers. It is a factor. In addition, conventionally, the processing time of the LF process may be delayed, and the variation in the processing time may be large, making it difficult to synchronize the converter, refining, and playing processes.

One embodiment of the present invention is to provide a molten steel refining device and a control method thereof that can automate the operation of the operation.

In the molten steel refining apparatus according to an aspect of the present invention, in the molten steel refining apparatus for refining is completed to perform the component adjustment and desulfurization work of the molten steel stored in the ladle, a temperature control device for adjusting the temperature of the molten steel stored in the ladle, molten steel A stirring device for stirring the metal, a sampling device for analyzing the components of the molten steel, and a ferrous alloy feeding device for adjusting the components of the molten steel by introducing ferroalloy into the ladle, wherein the processing information of the converter and the molten steel pretreatment plant is stored. HMI, which analyzes the components of molten steel using a MES and a sampling device, and calculates the input amount of ferroalloy by comparing the analyzed component values with those stored in MS, and H. The performance of molten steel is controlled by controlling the operation of at least one of the stirring device, the temperature control device, the bubbling device, the sampling device, and the ferrous alloy injection device according to the amount of work calculated by MI. A control unit measures the minutes or adjusts the components.

On the other hand, the stirring device includes an upper bubbling device including a top lance injected into the molten steel at the top of the ladle, a top bubbling valve provided to control the gas supplied to the top lance by the control unit, and a porous plug installed at the bottom of the ladle It may include a bottom bubbling device including a bottom bubbling portion for supplying a gas to the furnace, and a bottom bubbling valve provided to control the gas supplied to the bottom bubbling portion by the controller.

In addition, the lower bubbling device may further include a manual valve provided to control the gas supplied to the bottom bubbling part.

Here, the sampling device may include a sampling driving motor controlled by the control unit and moving the sampling device.

In addition, the temperature control device is a temperature sensor for measuring the temperature of the molten steel stored in the ladle, the electrode is inserted into the ladle to increase the temperature of the molten steel when the temperature measured by the temperature sensor is low, and controlled by the controller to move the electrode It may include an electrode drive motor.

The temperature controller may further include a coolant injector for introducing coolant into the ladle when the temperature measured by the temperature sensor is high.

It may include an entrance detection sensor provided to detect the ladle is located in the processing position, and the departure detection sensor provided to detect the ladle is leaving the processing position.

According to one embodiment of the present invention, it is possible to detect the entry or departure of the ladle, it is possible to determine the amount of ferro-alloy according to the steel type to be manufactured by measuring the components of the molten steel, so as to automate the LF process. In addition, the present sealing example can prevent the operation deviation caused by the operator during the manufacturing of molten steel by automating the LF process, and can prevent the deterioration of quality due to the operator's mistakes, thereby improving productivity and Synchronous operation can be reduced to reduce manufacturing costs.

1 is a block diagram of a molten steel refining apparatus according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Shapes and sizes of the elements in the drawings may be exaggerated for clarity, elements denoted by the same reference numerals in the drawings are the same elements.

1 is a block diagram of a molten steel refining apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the molten steel refining apparatus 10 of the present embodiment may be used in an LF process in which refining is completed to perform component adjustment and desulfurization of molten steel stored in the ladle 12. The ladle 12 may move in a state seated on the trolley 14.

To this end, the molten steel refining device 10 may be provided with a temperature control device 20 for adjusting the temperature of the molten steel stored in the ladle (12).

In addition, the molten steel refining device 10 may be provided with a stirring device 30 for stirring the molten steel. In one example, the stirring device 30 may supply gas to the ladle 12, and as the gas is discharged through the molten steel, the molten steel may be uniformly stirred.

In addition, the molten steel refining apparatus 10 may include a sampling device 40 for analyzing the components of the molten steel. Sampling device 40 may be provided to select a portion of the molten steel for component analysis of the molten steel.

As described above, a part of the molten steel selected by the sampling device 40 may be sent to an analysis chamber or the like to request component analysis.

In addition, in the present embodiment, the molten steel refining device 10 is selected from the sampling device 40, the ferroalloy input device for injecting ferroalloy to adjust the components of the molten steel so as to convert the molten steel analyzed by the component to the steel type desired by the user 50 may be included.

The ferroalloy input device 50 includes a plurality of hearth hoppers 52 in which raw materials corresponding to respective steel grades are stored, and the feed material 53 is provided by the feeder 53 installed under the hearth hoppers 52. (54) can be supplied in order. In addition, the basis weight and the input hopper 54 may be provided with a feeder 55 for supplying a basis weight of ferroalloy.

In addition, the molten steel refining apparatus 10 may include an MS (MES) (60). In addition, the MES 60 can determine the post-process logistics flow when the steel number is determined in the converter by a production schedule or the like. In addition, the MES 60 stores the processing information of the converter and the molten steel preliminary treatment plant, and stores information such as the amount of ferroalloy, the converter end point oxygen, and the like, which are input during the tapping process, which transfers the molten steel in the converter to the ladle 12. do.

In addition, the molten steel refining apparatus 10 analyzes the components of the molten steel using the sampling device 40, and then compares the component values of the analyzed molten steel with the component values stored in the MES 60 to calculate the input amount of ferroalloy. HMI 62 may be included.

In addition, in this embodiment, the molten steel refining device 10 controls the operation of at least one of the temperature control device 20, the sampling device 40, the ferroalloy input device 50 in accordance with the amount of work calculated by the HMI 62. It may include a control unit 64.

The control unit 64 may be controlled to measure a component of molten steel by using the sampling device 40, and may be controlled to input the ferroalloy according to the measured component of molten steel by controlling the ferroalloy input device 50.

As described above, in the present embodiment, the molten steel refining apparatus 10 automatically calculates the amount of ferroalloy input through the component analysis of molten steel, etc. in the HMI 62, and the ferroalloy input apparatus 50 is controlled by the controller 64. ), The ferroalloy can be automatically injected as much as the calculated dose.

On the other hand, the stirring device 30 in the present embodiment has been described as supplying a gas to uniform molten steel, but is not limited to this may be variously modified.

In addition, in the present embodiment, the stirring device 30 may be provided to stir the top or bottom of the molten steel.

In one example, the stirring device 30 may be composed of an upper bubbling device for stirring the upper portion of the molten steel, and a lower bubbling device for stirring the lower portion of the molten steel.

Here, the upper bubbling device may include a top lance 32 is introduced into the molten steel from the upper portion of the ladle (12). The top lance 32 may be provided to be lowered to the molten steel by the ladle drive motor 33 installed on one side.

In addition, a pipe 34a for supplying gas is connected to the top lance 32, and a top bubbling valve 34 may be installed on the pipe 34a. The top bubbling valve 34 may control the supply of gas to the top lance 32 by the control unit 64.

In addition, the lower bubbling device may include a bottom bubbling part 36 for supplying gas to the bore's porous plug installed under the ladle 12. In addition, the bottom bubbling unit 36 may be connected to a pipe 37a for supplying gas, and a bottom bubbling valve 37 may be installed in the pipe. The bottom bubbling valve 37 can control that gas is supplied to the porous plug of the bottom bubbling part 36 by the controller 64.

In addition, the lower bubbling device may further include a manual valve 38 provided to control the gas supplied to the bottom bubbling part 36.

On the other hand, the sampling device 40 may be partly put into the ladle 12 to select the molten steel, and may include a sampling drive motor 42 for moving the sampling device 40 for this purpose.

In addition, the temperature controller 20 is a temperature sensor for measuring the temperature of the molten steel stored in the ladle 12, the ladle 12 to increase the temperature of the molten steel when the temperature of the molten steel measured by the temperature sensor is lower than the process temperature It may include an electrode rod 22 is introduced into. In addition, the electrode rod 22 may extend to the operation region and be made to generate heat by supplying electricity to a portion introduced into the molten steel. In addition, the temperature control device 20 includes an electrode drive motor 24 for elevating the electrode 22 to adjust the temperature of the molten steel stored in the ladle 12. It may include. The electrode drive motor 24 can be controlled by the control unit 64 operation.

On the other hand, when the temperature of the molten steel measured by the temperature sensor is higher than the process temperature, a coolant may be added to lower the temperature of the molten steel. To this end, the temperature controller 20 may include a coolant injector for introducing coolant into the molten steel stored in the ladle 12. The coolant injector may be provided to input a predetermined amount of coolant by the controller 64.

In the present embodiment, the coolant injector may be formed in various forms for supplying a predetermined amount of coolant. For example, the coolant injector may include a feeder including a coolant reservoir and a feeder communicating with the coolant reservoir. The feeder is also connected by a controller to supply coolant. The coolant injector may be made of a separate device, it may be made integral with the ferroalloy input device (50).

In addition, the molten steel refining device 10 of the present embodiment may include an entrance detection sensor 16 installed in the processing position. The entrance detection sensor 16 detects this when the ladle 12 moves to the LF processing position, and transmits a signal indicating that the ladle 12 has entered the control unit 64.

The control unit 64 detects the entry of the ladle 12, and then performs the above-described processing.

In addition, the molten steel refining apparatus 10 of the present embodiment may further include a departure detection sensor 18 that detects the departure of the ladle 12 after the ladle 12 has completed the LF processing process. The departure detection sensor 18 detects this when the ladle 12 is separated from the LF processing position and transmits a signal to the control unit 64.

Looking at the action of the molten steel refining device 10 configured as described above are as follows.

First, during the refining of the general steel, when the tapping work is completed from the converter to the ladle 12, the weight of the molten steel is measured using a molten steel weighing apparatus. In the molten steel pretreatment plant, stirring is performed to homogenize molten steel components. At this time, the stirring operation is carried out by injecting gas using the stirring device 30, and stirred for a predetermined time. After a predetermined time elapses, the temperature of the molten steel is measured, and the chemical composition is analyzed by selecting molten steel using the sampling device 40.

On the other hand, the process information in the converter and the process information in the molten steel pretreatment plant, for example, the weight of molten steel and the input ferroalloy, the temperature and chemical composition of the molten steel, etc. are stored in the MES (60), using the information The HMI 62 determines the amount of ferroalloy required for refining the steel grade desired by the user. This process can be done before the ladle 12 reaches the RF treatment position.

For example, in the production of a steel species containing aluminum (Al), the amount of aluminum injected from the converter during the chemical composition analysis of molten steel and the component ratio of aluminum among the components analyzed samples of molten steel in the molten steel pretreatment plant.

The aluminum input amount to determine the stability of the components in the molten steel can be determined by the concentration of the end point oxygen, it can be determined by using the following equation (1).

At this time, when the oxygen at the converter end is 555ppm and the aluminum input amount is 630Kg, if the weight of molten steel stored in the ladle 12 is 273 tons, it is judged that the composition of the molten steel is stable when about 0.03% by weight of aluminum is performed. If the aluminum performance is less than 0.02% by weight, it can be determined that the molten steel component is unstable.

On the other hand, when it is determined that the components of the molten steel is stable, the components of the molten steel in the molten steel pretreatment plant have a component range as shown in the following table.

C Si Mn P S Al Ti Cu Nb V Min (%) 0.13 0.02 0.65 0.02 0.01 0.02 0.006 0.06 0.02 0.03 Aim (%) 0.15 0.70 0.035 0.03 0.035 Max (%) 0.17 0.75 0.05 0.04 0.04 BAP Performance 0.14 0.01 0.60 0.18 0.007 0.02 0.002 0.001 0.001 0.033

In the case of manganese (Mn), aluminum (Al), and niobium (Nb) as shown in Equation 1, the HMI 62 receives the information as shown in Table 1 of the MES 60 so that the control unit 64 receives the information as shown in Table 1 of the MES 60. When sending a signal to the control unit 64 sends a signal to the feeder 53 of the hearth hoppers 52 of the ferroalloy input device 50, using the basis weight and the input hopper 54 the amount calculated by the HMI 62 Basing weight

On the other hand, the MES 60 can estimate the temperature at the start of the treatment by calculating the temperature measured in the molten steel preliminary treatment plant and the start time of the processing. At this time, when the predicted temperature is higher than the temperature required during the LF processing, the HMI 62 sends a signal to the control unit 64 to control the temperature control device 20.

At this time, the control unit 64 controls the coolant injector of the temperature control device 20, the coolant stored in the storage unit of the coolant injector may be supplied in the basis weight by a feeder or the like.

Then, when the ladle 12 enters the LF processing position, the entry detection sensor 16 detects this and sends a signal to the control unit 64, the control unit 64 opens the bottom bubbling valve 37 to gas The bottom bubbling can be carried out by supplying.

On the other hand, when the predicted temperature of the molten steel falls within the required temperature range, the HMI 62 sends a signal to the control unit 64 to input the basis weight and ferroalloy stored in the feeding hopper 54. In addition, when a signal is received from the HMI 62, the control unit 64 opens the top bubbling valve 34 while sending a signal to the top lance 32 driving motor while lowering the top lance 32. Top bubbling can be performed. In this case, the top bubbling and the bottom bubbling may be simultaneously performed.

At the same time as the top bubbling, the HMI 62 sends a signal to the control unit 64 so as to mount the probe on the sampling device 40. In addition, while the top bubbling and bottom bubbling are simultaneously performed, the control unit 64 operates the sampling drive motor 42 to perform sampling and the temperature of the molten steel while the sampling device 40 descends downward.

Thereafter, the sample sampled by the sampling device 40 performs chemical analysis.

On the other hand, when the bottom bubbling and the top bubbling are simultaneously performed and a predetermined time has elapsed, when the homogenization of the components and the separation of the inclusions are completed, the HMI 62 sends a signal to the controller 64 to measure the temperature of the molten steel, When the set temperature is suitable for the starting temperature of the LF, the top lance driving motor 33 is signaled to raise the top lance 32. Then, the control unit 64 sends a signal to the top bubbling valve 34 at the position where the top lance 32 is out of the ladle 12, closes the top bubbling valve 34 to terminate the RF processing.

On the other hand, if the expected arrival temperature of the molten steel is lower than the required temperature by sending a signal to the electrode driving motor 24 to lower the electrode 22 to supply the power required to raise the temperature can increase the temperature of the molten steel.

In addition, when the temperature of the molten steel is increased, the above-described process may be repeated to allow the predicted temperature of the molten steel to fall within the required temperature range, and then the molten steel may be refined.

On the other hand, in the case of storage steel having a sulfur (S: sulfur) component of the steel grade of 50ppm or less, when the tapping work is completed from the converter to the ladle 12, the weight of the molten steel is measured using a molten steel weight measuring device. In the molten steel pretreatment plant, stirring is performed to homogenize molten steel components. At this time, the stirring operation is carried out by injecting gas using the stirring device 30, and stirred for a predetermined time. After a predetermined time elapses, the temperature of the molten steel is measured, and the chemical composition is analyzed by selecting molten steel using the sampling device 40.

On the other hand, the process information in the converter and the process information in the molten steel pretreatment plant, for example, the weight of molten steel and the like, such as ferroalloy, or the temperature and chemical composition of the molten steel may be stored in the MES (60). On the other hand, in the molten steel pretreatment plant, after the molten steel is sampled, the chemical composition is analyzed and stored in the MES 60. In addition, the MES 60 may store information on the amount of current supplied as well as the chemical composition of the molten steel.

On the other hand, when the components of molten steel are analyzed in the molten steel preliminary treatment plant, the HMI 62 firstly converts the end point oxygen of the converter stored in the MES 60 and quicklime and fluorspar, aluminum input and current values in the molten steel preliminary treatment plant. Will be compared. When sulfur S is lower than the upper limit target component among the component analysis values, the HMI 62 checks the components that are lower than the target value by comparing the component values with the target values as shown in Table 1. Then, the ferroalloy amount is determined according to the identified components for the production of the desired steel grade, and a signal is sent to the control unit 64 to command the feeder 53 of the hearth hopper 52 to basis weight and basis weight and It is stored in the input hopper (54).

In addition, when the ladle 12 arrives at the LF processing position, molten steel refining is started. At this time, the HMI 62 commands the control unit 64 to open the bottom bubbling valve 37 to supply gas from the bottom. It can be bubbling, and at the same time the ferroalloy is basis weight is sent to the feeder 55 of the stored basis weight and the feed hopper 54 to input the ferroalloy.

When the ferroalloy is input, the control unit 64 drives the top lance driving motor 33, and accordingly, the top lance 32 descends to bubble the upper portion of the molten steel. At this time, immediately before the top lance 32 reaches the molten steel, a signal is sent to the top bubbling valve 34 to perform top bubbling by the top lance 32.

The control unit 64 sends a signal to mount the probe at the same time as the top bubbling to mount the probe to the sampling device 40. Top bubbling and bottom bubbling are performed, and the sampling drive motor 42 is driven by lowering the sampling device 40 at a time point when the components become uniform after a predetermined time. The sampling device 40 samples the molten steel to analyze chemical components.

In addition, the control unit 64 commands the top lance drive motor 33 to raise the top lance 32 at the time when the inclusion separation is completed, and signals the top bubbling valve 34 at the time of leaving the molten steel. The top bubbling valve 34 to close.

On the other hand, after the top bubbling is completed, in the case of a steel type to which calcium (Ca) is injected, the HMI 62 sends a signal to the control unit 64 to send a signal to the calcium wire injector 58 to inject the calcium wire into the molten steel. do. After the addition of calcium wire, the component is homogenized and the treatment is completed at the time when the separation of the individual separation is completed.

At this time, when the temperature of the molten steel is required, the electrode driving motor 24 is lowered to supply electric power by the electrode 22 to heat up the molten steel, and when the temperature is completed, the controller 64 signals the electrode driving motor 24. After sending the electrode 22 to raise the rod and put the ferroalloy and repeat the process of the top bubbling.

On the other hand, when the sulfur (S) of the components analyzed in the molten steel preliminary treatment plant results in the target upper limit, MES (60) uses the equation (1) in the aluminum input in the converter and aluminum (Al) in the molten steel preliminary treatment plant (BAP) Read the component and current values from the molten steel pretreatment plant.

At this time, when the current value of the molten steel preliminary treatment plant is 150 mV or less and the molten steel preliminary treatment plant aluminum (Al) performance is 0.04% or less, the HMI 62 sends a signal to the control unit 64 in the quicklime hopper of the hearth hopper 52. As shown in Fig. 2, the input quantity is determined according to the sulfur (S) value of the molten steel pretreatment plant, and the quicklime is weighed.

(S) Goal-(S) Performance (%) ≥0.003 0.002 ~ 0.0029 0.0010-0.0019 ≤0.009 Quicklime input (Kg) 2000 1500 1000 500

In addition, when the current value is 150 mV or less and aluminum (Al) is 0.04% or less, the HMI 62 weighs aluminum so that the aluminum (Al) is 0.05% or more in the aluminum hopper of the hearth hopper 52 and stores it in the input hopper. When the ladle 12 arrives at the LF processing position, the entrance detection sensor 16 detects this and starts the LF processing. At this time, the HMI 62 sends a signal to the control unit 64 to open the bottom bubbling valve 8 to start the basis weight of the ferroalloy injection device 40 and the feeder 55 of the injection hopper 54 to enter the molten steel. Inject ferroalloy.

The controller 64 operates the top lance driving motor 33 to lower the top lance 32 to perform top bubbling, and then measures the temperature of the molten steel after a predetermined time. At this time, when the arrival temperature is lower than the required temperature compared to the starting temperature of the molten steel pretreatment plant, the HMI 62 instructs the control unit 64 to move the electrode driving motor 24 to lower the electrode 22 to reduce the temperature of the molten steel. After raising, ferroalloy is added and top bubbling is performed.

As such, increasing the temperature of the molten steel and removing the top slag in the reducing atmosphere is to promote degassing, when the molten steel has a high temperature, a high base, and a reducing atmosphere slag is prepared according to the following formula (1). Sulfur [S] is removed.

The dehydration work proceeds according to the above formula. During the dehydration operation, the HMI 62 issues a command to the control unit 64, and compares the target value with the component performance of the molten steel preliminary treatment plant as shown in Table 1 to basis weight of the ferroalloy of the lower limit element compared to the target value. And store in the input hopper 54. When the dehydration operation is completed after a predetermined time, the HMI 62 sends a signal to the control unit 64 so that the feeder 55 of the basis weight and the feeding hopper 54 is fed to inject the ferroalloy into the molten steel.

While injecting ferroalloy, the HMI 62 sends a signal to the control unit 64 to mount the probe on the sampling device 40. After a predetermined time after the ferroalloy is introduced, the sampling driving motor 42 is operated to lower the sampling device 40. And after performing the temperature and sampling operation | work with respect to molten steel by the sampling apparatus 40 lowered in this way, chemical analysis of molten steel is performed.

When a predetermined time elapses after the ferroalloy is input, the HMI 62 sends a signal to the top lance driving motor 33 from the control unit 64 to raise the top lance 32 and close the top bubbling valve 34. At this time, the HMI 4 can input the calcium wire by controlling the calcium wire input device 58 by the control unit 64 if it is a steel grade to inject calcium.

As such, after the calcium wire is injected, bottom bubbling is performed for a predetermined time. Then, when the departure detection sensor 18 detects that the ladle 12 is out of the processing position, the control unit 64 closes the bottom bubbling valve 37.

As such, the molten steel refining apparatus 10 according to the present embodiment may automatically perform operations such as adding ferroalloy, analyzing components, and controlling temperature as molten steel is transferred to the LF treatment position, and necessary measures in each process step. Can be performed immediately.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. It will be clear to those who have knowledge.

10 molten steel refining device 12 ladle
14: Balance 16: Ingress detection sensor
18: Departure detection sensor 20: Temperature control device
22: electrode 24: electrode drive motor
30: stirring device 32: top lance
34a: Piping 34: Top Bubbling Valve
36: bottom bubbling part 37: bottom bubbling valve
37a: Pipe 38: Manual Valve
40: sampling device 42: sampling drive motor
50: ferroalloy injection device 52: hearth hopper
53: feeder 54: basis weight and feed hopper
55: feeder 60: MES (MES)
62: HMI 64: control unit

Claims (7)

In the molten steel refining device for the refining of the molten steel stored in the ladle after the refining is completed,
A temperature controller for controlling the temperature of the molten steel stored in the ladle;
A stirring device for stirring the molten steel,
A sampling device for analyzing a component of the molten steel;
It includes a ferroalloy input device for adjusting the components of the molten steel by injecting ferroalloy into the ladle,
MES (MES) for storing the processing information of the converter and molten steel preliminary treatment plant,
An HMI for analyzing the components of the molten steel using the sampling device, and comparing the analyzed component values with those stored in the MS to calculate an input amount of ferroalloy;
According to the amount of work calculated by the HM control the operation of at least one of the stirring device, the temperature control device, the bubbling device, the sampling device, the ferroalloy input device to measure the components of the molten steel or adjust the components Molten steel refiner comprising a control unit.
The method according to claim 1, wherein the stirring device
An upper bubbling device including a top lance injected into the molten steel from the top of the ladle, and a top bubbling valve provided to control the gas supplied to the top lance by the control unit;
And a bottom bubbling device including a bottom bubbling part for supplying gas to a porous plug installed under the ladle, and a bottom bubbling valve provided to control the gas supplied to the bottom bubbling part by the controller. Molten steel refiner.
The method according to claim 2,
The lower bubbling device further comprises a manual valve provided to control the gas supplied to the bottom bubbling portion.
The method according to claim 1,
The sampling device is a molten steel refiner, characterized in that it comprises a sampling drive motor controlled by the control unit for moving the sampling device.
The method according to claim 1,
The temperature control device is controlled by a temperature sensor for measuring the temperature of the molten steel stored in the ladle, an electrode rod which is inserted into the ladle to increase the temperature of the molten steel when the temperature measured by the temperature sensor is low; Molten steel refining device comprising an electrode drive motor for moving the electrode.
The method according to claim 1,
The temperature control device is molten steel refining device, characterized in that it comprises a coolant injector for introducing a coolant to the ladle, when the temperature measured by the temperature sensor is high.
The method according to any one of claims 1 to 6,
An entrance detection sensor provided to detect the ladle being located at an LF processing position;
And a departure detection sensor provided to detect the ladle leaving the LF processing position.

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