Slag scraping device and slag scraping method

Abstract

To provide a slag scraping device capable of properly controlling a slag removing operation.SOLUTION: A slag scraping device (1) includes an acquisition unit (410) that estimates the amount of change in the removal amount of slag removed by two consecutive removing operations, an update unit (411) that derives a coefficient indicating the relation between the amount of change in the parameter and the amount of change in the removal amount, and an adjustment unit (412) that adjusts the parameter to be used for the next removing operation based on the coefficient and the removal amount of the slag.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a slag draining apparatus and a slag draining method. [Background technology]

[0002] Patent Document 1 discloses a slag removal system that calculates a slag removal operation schedule based on the amount of slag remaining on the surface of the molten metal in a vessel after the slag has been removed by a slag removal member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-163568 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since it is difficult to accurately measure the amount of residual slag, it may be difficult to properly control the slag removal operation in the slag removal system described in Patent Document 1.

[0005] The present disclosure has been made in consideration of the above problems, and aims to provide a slag discharge device and a slag discharge method that can appropriately control the slag removal operation. [Means for solving the problem]

[0006] In order to solve the above problems, a slag removal device according to one embodiment of the present disclosure is a slag removal device that removes slag that forms on the surface of molten iron, and includes: a container that stores the molten iron; a slag removal unit that has a scraper and drives the scraper based on predetermined parameters to repeatedly remove the slag from the container through the scraping port; and a control unit. The control unit includes an acquisition unit that acquires the change in the amount of slag removed by two consecutive removal operations; an update unit that derives a coefficient indicating the relationship between the change in the parameter and the change in the removal amount based on the change in the parameter between the two consecutive removal operations; and an adjustment unit that adjusts the value of the parameter to a value of the parameter to be used in the next removal operation based on the coefficient indicating the relationship between the change in the parameter and the change in the removal amount and the amount of slag removed by the removal operation.

[0007] In addition, the removal operation is an operation of moving the scraper to an insertion position located above the molten iron surface in the vessel, lowering the scraper from the insertion position, moving the scraper to a lifting position located closer to the scraping port than the insertion position, and lifting the scraper from the lifting position, and the parameters may include the lifting position.

[0008] In addition, the parameters may include the height of the scraper, and the adjustment unit may adjust the height of the scraper when the lifting position in the next removal operation is outside a specified range, thereby adjusting the lifting position to a value within the specified range.

[0009] In addition, the update unit may derive a coefficient indicating the relationship between the change in the parameter and the change in the removal amount from past actual values ​​of the change in the parameter and the change in the removal amount, and the adjustment unit may adjust the parameter to be used in the next removal operation based on the amount of slag removed by the removal operation, the target value for the amount of slag to be removed by the removal operation, and the coefficient derived by the update unit.

[0010] In addition, in order to solve the above-mentioned problems, another aspect of the present disclosure provides a slag removal method for removing slag generated on the surface of molten iron, using a slag removal device including a container for accommodating the molten iron, a slag removal unit having a scraper plate that drives the scraper plate based on predetermined parameters and repeats a removal operation to remove the slag from the container through the scraping port, and a control unit. The method includes the following steps: an acquisition step using the control unit to acquire a change in the amount of slag removed by two consecutive removal operations; an update step to derive a coefficient indicating the relationship between the change in the parameter and the change in the removal amount based on the change in the parameter between the two consecutive removal operations; and an adjustment step to adjust the value of the parameter to a value of the parameter to be used in the next removal operation based on the coefficient indicating the relationship between the change in the parameter and the change in the removal amount and the amount of slag removed by the removal operation. [Effects of the Invention]

[0011] According to the present disclosure, a slag discharge device and a slag discharge method can be obtained that can appropriately control the slag removal operation. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram illustrating a configuration example of a slag discharge device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram used to explain the slag removal operation by the slag removal unit. [Figure 3] FIG. 2 is a diagram illustrating an example of the configuration of a control device provided in a slag discharge device according to an embodiment of the present disclosure. [Figure 4] 3 is a flowchart showing the flow of a removal operation in a slag removal device according to an embodiment of the present disclosure. [Figure 5] FIG. 1 is a schematic diagram illustrating a configuration example of a slag discharge device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Embodiment 1] (Configuration of slag removal equipment) An embodiment of the present disclosure will be described in detail below. Figures 1 and 5 are schematic diagrams showing an example configuration of a slag discharge device according to an embodiment of the present disclosure. In particular, Figure 1 is a schematic diagram of the slag discharge device 1 as viewed from a horizontal direction perpendicular to the movement direction of a scraper plate 21 (described later), and Figure 5 is a schematic diagram of the slag discharge device 1 as viewed from the movement direction of the scraper plate 21 (described later). The slag discharge device 1 shown in Figures 1 and 5 includes a storage unit 10, a slag removal unit 20, a first imaging unit 31, a second imaging unit 32, and a control device 40.

[0014] The accommodation unit 10 has a vessel 11 and a support 12. The vessel 11 is a structure for accommodating molten iron, such as a hot metal ladle used in hot metal pretreatment. Slag floats on the surface of the molten iron accommodated in the vessel 11 depending on the progress of the slag formation reaction during the hot metal pretreatment. Slag is generated during each treatment in the hot metal pretreatment, such as desulfurization, dephosphorization, and desiliconization, and its properties vary depending on the composition of the molten iron and the type of pretreatment.

[0015] The support part 12 supports the container 11. The support part 12 has a tilting axis 120 and holds the container 11 so that it can tilt around the tilting axis 120. In the following, as shown by the arrows in Figure 1, the horizontal direction perpendicular to the direction from the container 11 toward the slag removal part 20 (the direction in which the scraper plate 21 moves when scraping out the slag) is defined as the X-axis direction, the horizontal direction from the container 11 toward the slag removal part 20 is defined as the Y-axis direction, and the vertical direction is defined as the Z-axis direction. The tilting axis 120 extends in the X-axis direction.

[0016] When the vessel 11 is tilted about the tilting axis 120 from the initial position (where the opening of the vessel 11 faces vertically upward) shown by the dashed line in Fig. 1, the molten pig iron surface 70 formed by the molten pig iron in the vessel 11 approaches a part of the downward-facing edge 110 of the vessel 11. Note that the molten pig iron surface 70 does not mean only the surface of the molten pig iron contained inside the vessel 11, but also means the surface of the slag if slag is floating on the surface of the molten pig iron.

[0017] When the vessel 11 is in the position shown by the solid line in Fig. 1, the portion of the edge 110 on the positive side of the Y axis direction is lower and closer to the molten iron surface 70 than when the vessel 11 is in the position shown by the dashed line in Fig. 1. Hereinafter, the portion of the edge 110 of the vessel 11 that approaches the molten iron surface 70 due to tilting of the vessel 11 will be referred to as the scraping opening 111.

[0018] The slag removal unit 20 has a scraper plate 21, and is a mechanism that drives the scraper plate 21 based on predetermined parameters and repeatedly performs a removal operation to remove slag from the scraping port 111 of the container 11 to the outside of the container 11. More specifically, the slag removal unit 20 has the scraper plate 21 and a drive unit 22, and by driving the scraper plate 21, the slag removal unit 20 removes slag from the scraping port 111 side of the container 11 to the outside of the container 11. The slag 50 scraped out from the scraping port 111 is collected in a slag pan B or the like. The slag removal unit 20 repeatedly performs this slag removal process.

[0019] The scraper 21 has a surface that is approximately perpendicular to the direction of travel, and moves approximately parallel to the molten iron surface 70 while scraping the molten iron surface 70 in the vessel 11 with this surface, thereby scraping and removing the molten iron and slag that forms on the surface of the molten iron.

[0020] The driving unit 22 moves the scraper 21 toward the coordinates specified by the control device 40. The scraper 21 is movable at least in the Y-axis direction and the Z-axis direction.

[0021] The first imaging unit 31 is an imaging device such as a camera or CCD that captures an image of the slag being removed from the vessel 11 and generates a first captured image. That is, as shown in Fig. 5, the first imaging unit 31 captures an image of the entire molten iron surface 70 or a part of the molten iron surface 70 including the scraping opening 111 at a predetermined frame rate from a position that is approximately horizontal to the molten iron surface 70 and approximately perpendicular to the moving direction of the scraper 21, and generates a first captured image showing the slag being removed from the vessel 11 for each frame. Note that the first captured image obtained while the slag is being scraped from the vessel 11 using the slag removal unit 20 includes an image of the scraper 21. The second imaging unit 32 is an imaging device such as a camera or CCD that captures an image of the slag removed from the scraping opening 111. That is, the second imaging unit 32 captures an image of an area including at least the space outside the container 11 that is located a predetermined distance below the scraping opening 111, and generates a second captured image. The second imaging unit 32 captures an image at the timing when the slag 50 is scraped out from the scraping opening 111.

[0022] The control device 40 is, for example, a computer installed in an operation room of a steel mill, and controls each part of the slag removal device 1. The control device 40 receives a first captured image from the first imaging unit 31 and a second captured image from the second imaging unit 32. The control device 40 also specifies the Y-axis coordinate and Z-axis coordinate of the scraper 21 to the driving unit 22, and drives the scraper 21 to the specified position.

[0023] (Removal operation) 2 is a diagram showing the slag removal operation by the slag removal unit 20. Under the control of the control device 40, the slag removal unit 20 repeats the following operations to remove slag 71 formed on the surface of the molten iron 72 contained in the vessel 11.

[0024] (1) The height Z1 of the tip of the scraper 21 is maintained higher than the set value Z0 of the height of the tip of the scraper 21, which corresponds to the height of the molten iron surface 70, and the scraper 21 is moved to the insertion position P1 set above the molten iron surface 70. (2) The scraper 21 is lowered by a predetermined distance. The predetermined distance is longer than Z1-Z0. (3) The scraper 21 is moved in the positive direction of the Y axis to the lifted position P2. (4) The scraper 21 is moved in the positive direction of the Y axis while being raised until the tip of the scraper 21 is outside the container 11.

[0025] If the setting value of the height Z0 of the scraper 21 and the amount of descent of the scraper 21 in operation (2) are appropriately set, the tip of the scraper 21 will be inserted into the molten iron surface 70 by operation (2). Operations (3) and (4) are examples of operations that pull the scraper 21 back out of the vessel. When the tip of the scraper 21 is inserted into the molten iron surface 70, operations (3) and (4) will scrape the slag 71 in the area between the scraper 21 and the scraping opening 111 beyond the opening 111 and out of the vessel 11. By repeating operations (1) to (4), the slag 71 in the vessel 11 will decrease, and the molten iron 72 will be exposed at the molten iron surface 70. The height of the scraper 21 may decrease over time.

[0026] (Control device configuration) 3 is a diagram showing an example of the configuration of a control device provided in a slag removal device according to an embodiment of the present disclosure. The control device 40 shown in FIG. 3 includes a control unit 41, a storage unit 42, a display unit 43, and an input interface 44.

[0027] The control unit 41 is configured with, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), etc. The storage unit 42 is, for example, an information recording medium such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and stores programs executed by the control unit 41.

[0028] The display unit 43 is, for example, a display, and can display the first captured image, the second captured image, an operation screen of the slag discharge device 1, and the like.

[0029] The input interface 44 includes, for example, a USB (Universal Serial Bus) terminal, a LAN (Local Area Network) terminal, etc. The control unit 41 acquires the first captured image and the second captured image from the first imaging unit 31 and the second imaging unit 32 via the input interface 44.

[0030] (Function of slag removal equipment) The control unit 41 executes the programs stored in the storage unit 42 to function as an acquisition unit 410, an update unit 411, and an adjustment unit 412.

[0031] The acquisition unit 410 is a functional unit that acquires the change ds in the amount of slag removed by two consecutive removal operations. The acquisition unit 410 estimates the change ds in the amount of slag removed, for example, using the following equation [1]: ds=a y ×dy+a z ×dz …[1]

[0032] dy is the amount of change in the Y coordinate of the lifting position P2 during two consecutive removal operations. dz is the amount of change in the height Z0 of the scraper 21 during two consecutive removal operations. The Y coordinate of the lifting position P2 and the height Z0 of the scraper 21 are examples of parameters. The amount of change dz in the height Z0 of the scraper 21 is estimated based on the output from an encoder provided in a drive unit (not shown) that drives the scraper 21.

[0033] a y is a weighting coefficient that represents the influence of the change in the Y coordinate of the lifting position P2 on the change in the amount of slag removed, ds, during two successive removal operations. z is a weighting coefficient that represents the influence of the change amount dz of the height Z0 of the scraper plate 21 on the change amount ds of the amount of slag removed in two successive removal operations.

[0034] The past actual values ​​(dy, dz, ds) of the change dy in the Y coordinate of the pulling-up position P2, the change dz in the height Z0 of the scraper 21, and the change ds in the amount of slag removed are stored in the memory unit 42.

[0035] The update unit 411 is a functional unit that derives a coefficient indicating the relationship between the amount of change in the parameters and the amount of change in the removal amount based on the amount of change in the parameters in two consecutive removal operations. That is, the update unit 411 calculates the amount of change (dy, dz, ds) in the two most recent removal operations, and derives a weighting coefficient a based on the past actual values ​​(dy, dz, ds) including the calculated amount of change (dy, dz, ds). y and a z For example, the update unit 411 derives an approximate line that indicates the relationship between dy and ds among the past performance values ​​(dy, dz, ds), and calculates the slope of the approximate line as a weighting coefficient a y The update unit 411 derives an approximate line that indicates the relationship between dz and ds among the past performance values ​​(dy, dz, ds), and calculates the slope of the approximate line as a weighting coefficient a z Let's say.

[0036] The adjustment unit 412 is a functional unit that adjusts the value of the parameter to a value to be used in the next removal operation based on a coefficient that indicates the relationship between the amount of change in the parameter and the amount of change in the removal amount, and the amount of slag removed by the removal operation. y and a z The adjustment unit 412 adjusts the parameters to be used in the next removal operation based on the following equation [2]. t Calculate. Y t =(ss t-1 ) / a y +Y t-1 …[2] Here, s is the target amount of slag removed in one removal operation. t-1 is the amount of slag removed by the previous removal operation. Y t-1 is the Y coordinate of the lifting position P2 in the previous removal operation. The amount of slag removed by the previous removal operation s t-1may be the area of ​​a first region, which is a region corresponding to the molten iron surface 70 located between the scraper 21 and the scraping port 111 in the first captured image. The first region is composed of, for example, pixels located in the moving direction of the scraper 21, whose brightness is higher than a predetermined threshold value.

[0037] If the lifting position P2 is too far from the scraping opening 111, the slag may not be scraped out of the container 11. If the lifting position P2 is too close to the scraping opening 111, the scraper 21 may collide with the edge 110 of the container 11. Therefore, the Y calculated by the above formula [2] t The value of Y max and lower limit Y min is predetermined.

[0038] The adjustment unit 412 calculates the Y coordinate Y of the lifting position P2 calculated by the above formula [2]. t is the lower limit Y min to upper limit Y max If it is outside the range, adjust the height Z0 of the scraper 21 by the following formula [3], and t By readjusting the value of Y t The value of the lower limit Y min to upper limit Y max Adjust it to within the range. Z t =(ss t-1 ) / a z +Z t-1 …[3] Y t =(s-ds z ) / a y +Y t-1 …[4]

[0039] where Z t is the height Z0 of the scraper 21 in the removal operation performed this time. t-1 is the height Z0 of the scraper 21 in the previous removal operation. t-1 is the Y coordinate of the lifting position P2 in the previous removal operation.

[0040] ds zis a value calculated by the following formula [5]. ds z =dz min ×a z …[5] where dz min is the amount by which the height Z0 of the scraper 21 fluctuates during one removal operation.

[0041] (Slag removal equipment operation) 4 is a flowchart showing the flow of the removal operation in the slag removal device according to one embodiment of the present disclosure. When the process of FIG. 4 is started, the container 11 is supported by the support part 12 in a tilted state at a predetermined tilt angle. In addition, the Y coordinate of the lifting position P2, the height Z0 of the scraper 21, and the weighting coefficient a y and a z The initial value of is predetermined.

[0042] The control unit 41 of the control device 40 acquires a first captured image from the first imaging unit 31 (S100).

[0043] In the next step S200, the control unit 41 controls the drive of the slag removal unit 20 based on the Y coordinate of the lifting position P2 and the set value of the height Z0 of the scraper 21, and performs the removal operation. In the next step S300, the control unit 41 functions as the acquisition unit 410 and acquires the change in the amount of slag removed by two consecutive removal operations, ds, using, for example, equation [1]. The control unit 41 acquires the change in the amount of slag removed, ds, from the difference in the area of ​​the first region corresponding to the molten iron surface 70 located between the scraper 21 and the scraping port 111 in the first captured image, for example, during the two most recent removal operations. In the first removal operation, the control unit 41 may estimate the value of ds to be a predetermined value (e.g., 0). In addition, when the slag removal unit 20 performs a removal operation to remove slag from the scraping port 111 of the container 11, the second imaging unit 32 is configured to determine whether or not the slag 50 falling from the container 11 is imaged.If the second imaging unit 32 does not image the slag 50 falling from the container 11 when the slag removal unit 20 performs a removal operation, the acquisition unit 410 may determine that the scraper 21 was not properly inserted into the molten iron surface 70 and that it missed, and may set the amount of slag removed in the removal operation to 0.

[0044] In the next step S400, the control unit 41 functions as an updating unit 411, calculates the amount of change (dy, dz, ds) in the two most recent removal operations, and calculates a weighting coefficient a based on the past actual values ​​(dy, dz, ds) including the calculated amount of change (dy, dz, ds). y and a z Update.

[0045] In the next step S500, the control unit 41 functions as the adjustment unit 412 and determines the Y coordinate of the lifting position P2 and the height Z0 of the scraper 21 in the next removal operation based on the formulas [2], [3], [4] and [5].

[0046] In S600, the control unit 41 determines whether to maintain the target value s of the amount of slag removed per one removal operation. The control unit 41 determines whether to maintain the target value s of the amount of slag removed per one removal operation, for example, based on the number of times the removal operation has been repeated.

[0047] If the control unit 41 maintains the target value s of the amount of slag removal (S600: YES), the control unit 41 proceeds to the processing of S800. If the control unit 41 does not maintain the target value s of the amount of slag removal, for example, if the number of times the removal operation has been repeated reaches a predetermined number (S600: NO), the control unit 41 changes the target value s of the amount of slag removal (S700) and proceeds to the processing of S800.

[0048] In S800, the control unit 41 determines whether to end the removal operation. The control unit 41 determines to end the removal operation when a preset end condition is met. For example, the control unit 41 provides a camera that captures an image of the inside of the container 11, and determines whether to end the removal operation based on the area of ​​a pixel region whose brightness is equal to or greater than a predetermined first threshold in an image captured by the camera. For example, if the area of ​​the pixel region whose brightness is equal to or greater than the first threshold is equal to or greater than a second threshold, the control unit 41 determines to end the removal operation (S800: YES) and ends the removal operation. If the control unit 41 does not end the removal operation (S800: NO), it acquires the first captured image and the second captured image of the next frame (S100).

[0049] [Modification] In the above embodiment, the control unit 41 sets the Y coordinate of the lifting position P2 and the height Z0 of the scraper 21 as parameters to be processed by the acquisition unit 410, the update unit 411, and the adjustment unit 412. However, the parameters to be processed by the acquisition unit 410, the update unit 411, and the adjustment unit 412 are not limited to the Y coordinate of the lifting position P2 and the height Z0 of the scraper 21. For example, the tilt angle of the container 11 during the removal operation, the Y coordinate of the insertion position P1, and the speed at which the scraper 21 is moved may also be processed. Furthermore, the acquisition unit 410, the update unit 411, and the adjustment unit 412 may set at least one of the parameters of the Y coordinate of the lifting position P2, the height Z0 of the scraper 21, the Y coordinate of the insertion position P1, and the speed at which the scraper 21 is moved.

[0050] 〔summary〕 The slag removal device in aspect 1 of the present disclosure is a slag removal device that removes slag that forms on the surface of molten iron, and includes: a container that stores the molten iron; a slag removal unit that has a scraper and drives the scraper based on predetermined parameters to repeat a removal operation that removes the slag from the container through the scraping port; and a control unit. The control unit includes an acquisition unit that acquires the change in the amount of slag removed by two consecutive removal operations; an update unit that derives a coefficient that indicates the relationship between the change in the parameter and the change in the removal amount based on the change in the parameter between the two consecutive removal operations; and an adjustment unit that adjusts the value of the parameter to a value of the parameter to be used in the next removal operation based on the coefficient that indicates the relationship between the change in the parameter and the change in the removal amount and the amount of slag removed by the removal operation.

[0051] According to the above configuration, the slag removal operation can be appropriately controlled without using the amount of slag remaining in the container 11.

[0052] In the slag removal device of aspect 2 of the present disclosure, in aspect 1, the removal operation is an operation of moving the scraper to an insertion position located above the molten iron surface of the vessel, lowering the scraper from the insertion position, moving the scraper to a lifting position located closer to the scraping port than the insertion position, and lifting the scraper from the lifting position, and the parameters may include the lifting position.

[0053] The Y coordinate of the lifting position P2 is easier to precisely control than the height Z0 of the scraper 21 of the container 11. According to the above configuration, the position of the lifting position P2 is included in the parameters adjusted by the adjustment unit 412, so that the slag removal operation can be appropriately controlled.

[0054] In the slag removal device of aspect 3 of the present disclosure, in aspect 2, the parameters include the height of the scraper, and when the lifting position in the next removal operation is outside a predetermined range, the adjustment unit may adjust the height of the scraper to adjust the lifting position to a value within the predetermined range.

[0055] The amount of change in the height Z0 of the scraper 21 tends to be more closely correlated with the amount of change in the amount of slag removed than the amount of change in the Y coordinate of the pull-up position P2. When the Y coordinate of the pull-up position P2 cannot be adjusted within a specified range, the slag removal operation can be more appropriately controlled by adjusting the height Z0 of the scraper 21.

[0056] The slag removal device according to a fourth aspect of the present disclosure is any one of the first to third aspects, wherein the update unit derives a coefficient indicating a relationship between the change in the parameter and the change in the removal amount from past actual values ​​of the change in the parameter and the change in the removal amount; The adjustment unit may adjust the parameters to be used in the next removal operation based on the amount of slag removed by the removal operation, the target value for the amount of slag to be removed by the removal operation, and the coefficient derived by the update unit.

[0057] According to the above configuration, the slag removal operation can be appropriately controlled based on the amount of change in the parameter.

[0058] A slag removal method in a fifth aspect of the present disclosure is a slag removal method for removing slag generated on the surface of molten iron, using a slag removal device including: a vessel for accommodating the molten iron; a slag removal unit having a scraper plate that drives the scraper plate based on predetermined parameters and repeats a removal operation to remove the slag from the vessel through the scraping port; and a control unit. The slag removal method includes the following steps: an acquisition step using the control unit to acquire a change in the amount of slag removed by two consecutive removal operations; an update step to derive a coefficient indicating the relationship between the change in the parameter and the change in the removal amount based on the change in the parameter between the two consecutive removal operations; and an adjustment step to adjust the value of the parameter to a value of the parameter to be used in the next removal operation based on the coefficient indicating the relationship between the change in the parameter and the change in the removal amount and the amount of slag removed by the removal operation.

[0059] According to the above configuration, the slag removal operation can be appropriately controlled without using the amount of slag remaining in the container 11.

[0060] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. [Explanation of symbols]

[0061] 1 Slag removal equipment 11 Container 20 Slag removal section 21 Scraping board 22 Drive unit 41 Control Unit 42 Storage section 50, 71 Slag 70 Hot metal surface 111 scraping opening 120 Tilt axis 410 Acquisition Department 411 Update Department 412 Adjustment section ay, az coefficients ds, dy, dz change amount P1 Insertion position P2 Raised position s target value

Claims

1. A slag removal device for removing slag formed on the surface of molten iron, a vessel for accommodating the molten iron; a slag removal unit that has a scraper plate, drives the scraper plate based on predetermined parameters, and repeats a removal operation of removing the slag from the scraping port of the container to the outside of the container; A control unit; Equipped with The control unit an acquisition unit that acquires a change in the amount of slag removed by two consecutive removal operations; an updating unit that derives a coefficient indicating a relationship between a change in the parameter and a change in the removal amount based on a change in the parameter in two consecutive removal operations; an adjusting unit that adjusts the value of the parameter to a value of the parameter to be used in a next removal operation based on a coefficient indicating a relationship between a change in the parameter and a change in the removal amount, and the amount of slag removed by the removal operation; A slag removal device having:

2. The removing operation is an operation of moving the scraper to an insertion position located above the molten iron surface in the vessel, lowering the scraper from the insertion position, moving the scraper to a lifting position located closer to the scraping port than the insertion position, and lifting the scraper from the lifting position, The slag removal device according to claim 1 , wherein the parameters include the lifting position.

3. The parameters include the height of the scraper, The slag removal device according to claim 2, wherein the adjustment unit adjusts the height of the scraper plate when the lifting position in the next removal operation is outside a predetermined range, and adjusts the lifting position to a value within the predetermined range.

4. the update unit derives a coefficient indicating a relationship between the change in the parameter and the change in the removal amount from past actual values ​​of the change in the parameter and the change in the removal amount; A slag removal device as described in any one of claims 1 to 3, wherein the adjustment unit adjusts the parameters to be used in the next removal operation based on the amount of slag removed by the removal operation, the target value for the amount of slag to be removed by the removal operation, and the coefficient derived by the update unit.

5. A slag removal method for removing slag formed on the surface of molten iron, comprising the steps of: a vessel for accommodating the molten iron; a slag removal unit that has a scraper plate, drives the scraper plate based on predetermined parameters, and repeats a removal operation of removing the slag from the scraping port of the container to the outside of the container; A control unit; A slag removal device equipped with Using the control unit, an acquisition step of acquiring a change in the amount of slag removed by two successive removal operations; an updating step of deriving a coefficient indicating a relationship between a change in the parameter and a change in the removal amount based on a change in the parameter in two consecutive removal operations; an adjusting step of adjusting the value of the parameter to a value of the parameter to be used in a next removal operation based on a coefficient indicating a relationship between a change in the parameter and a change in the removal amount and the amount of slag removed by the removal operation; A slag removal method comprising:

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