Converter tapping method, converter tapping control device, and converter tapping control program

Abstract

This invention provides a converter tapping method that eliminates the need for equipment modifications and allows for the determination of the appropriate range of ladle position using essentially only the tilt angle of the converter as a variable. [Solution] A method for tapping molten steel from a converter, wherein the molten steel in the converter is discharged from the tapping port of the converter by tilting the furnace body of the converter, and the ladle position is adjusted to receive the steel in a ladle on a receiving trolley, the method comprising: a first step of determining an appropriate range for the ladle position according to the tilting angle of the converter; and a second step of issuing an alarm when the ladle position falls outside the appropriate range.

Description

[Technical Field]

[0001] The present invention relates to a method for tapping steel from a converter in converter operation, a control device for converter tapping, and a control program for converter tapping. In particular, it relates to a method for tapping steel from a converter, a control device for converter tapping, and a control program for converter tapping that eliminate the need for equipment modifications and can determine the appropriate range of the ladle position using essentially only the tilt angle of the converter as a variable. In this specification, "x~y" representing a numerical range means x or more and y or less, including boundary values. "t", a unit of mass, means 1000 kg. [Background technology]

[0002] Traditionally, in converter operation, when tilting the converter to receive molten steel from the furnace into a ladle below, the landing point of the tapped steel flow changes moment by moment as the converter is gradually tilted. Therefore, operators were forced to adjust the position of the ladle by experience and visual inspection to perform the tapping operation. If molten steel spills out of the ladle, it can lead to major problems such as fire spreading to surrounding equipment or prolonged operational shutdowns due to the melting and seizing of the steel receiving trolley. Therefore, from the start to the end of tapping, operators must constantly monitor the tapping flow and correctly operate the converter tilt and steel receiving trolley, which places a significant mental burden on them.

[0003] To solve these problems, Patent Document 1 proposes a system that uses an imager to capture the trajectory of the tapped steel flow and image processing to move the center position of the ladle to the position where the tapped steel flow falls. Patent Document 2 also proposes a method for determining the position where the tapped steel flow falls by capturing the tapped steel flow with a CCD camera, using the captured image as input, and calculating a grayscale level according to the brightness for each pixel of the input image. Furthermore, Patent Document 3 proposes a method for moving the ladle to the position where the tapped steel flow falls using data values ​​related to multiple variables. The variables used in the method according to Patent Document 3 include the furnace refractory profile, tapping hole diameter, amount of molten steel in the furnace before tapping, furnace slag volume, and amount of molten steel in the ladle on the receiving trolley. [Prior art documents]

Patent Document

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, methods for determining the falling position of the molten steel flow by image input and image processing using an imaging device or a CCD camera have been proposed as in Patent Documents 1 and 2. However, in such methods, there is a case where the molten steel flow itself becomes difficult to visually recognize due to the smoke generated during the tapping, and in that case, there is a problem that the operator has to rely on his own experience. In addition, since the introduction of a camera and the development of an image processing system are required, there is a problem that the scale of modification in terms of equipment becomes too large. Patent Document 1 discloses the process of deriving the falling position of the molten steel flow based on the information obtained by the imaging device. In that case, since the tapping speed of the molten steel flow, which is an important variable, is also estimated from the position information of two points obtained by the camera, accurate imaging is a prerequisite, and the solution of the above problems has been demanded. Furthermore, as in Patent Document 3, a method for determining the falling position of the molten steel flow from a plurality of variables has also been proposed. Such a method requires the reading of a large number of variables. In particular, in the case of items that change due to wear such as the furnace refractory profile and the tapping hole diameter and cannot be constantly sensed, and items that require modification on the receiving ladle side such as the amount of molten steel in the ladle, the capture itself becomes a high barrier and there is a problem that it cannot be implemented.

[0006] To solve the problems described above in the prior art, the present invention aims to provide a converter tapping method, a converter tapping control device, and a converter tapping control program that do not require any modifications to the equipment and can determine the appropriate range of the ladle position using only the tilt angle as a variable. [Means for solving the problem]

[0007] A first aspect of the present invention that advantageously solves the above problems is a method for tapping steel from a converter, wherein the molten steel in the converter is discharged from the tapping port of the converter by tilting the furnace body, and the ladle position is adjusted to receive the steel in a ladle on a receiving trolley, A first step is to determine the appropriate range for the ladle position according to the tilt angle of the converter, A second step involves issuing an alarm when the ladle position deviates from the appropriate range, It is characterized by including.

[0008] Furthermore, in the method of tapping steel from a converter according to the first embodiment described above, (a) In the first step, the discharge rate of the steel flow is used as a variable. (b) In the first step, determine the appropriate range of the ladle position using the following formulas 1 to 3, and (c) In the first step, the ladle position satisfies all the conditions determined by the following formulas 1 to 3. These would be more preferable solutions.

number

number

[0009] A second aspect of the present invention that advantageously solves the above problems is a control device for converter tapping, an input unit for inputting operation information including the tilting angle of the converter, a storage unit for storing the operation information input to the input unit, a calculation unit for determining an appropriate range of the ladle position based on the operation information stored in the storage unit, an alarm unit for issuing an alarm when the ladle position deviates from the appropriate range determined by the calculation unit, and is characterized by comprising the above.

[0010] Further, in the control device for converter tapping according to the second aspect, (d) The operation information includes the discharge rate of the steel flow, (e) The calculation unit determines the appropriate range of the ladle position using the above formulas 1 to 3. These would be more preferable solutions.

[0011] A third aspect of the present invention that advantageously solves the above problems is a control program for converter tapping, characterized in that it causes a computer to execute each step of the converter tapping method described in any of the above. [Effects of the Invention]

[0012] According to the present invention, when tapping steel in converter operation, no equipment modifications are required, and the appropriate range for the ladle position can be determined using essentially only the tilt angle of the converter as a variable. Furthermore, since an alarm is issued when the ladle position falls outside this appropriate range, it is possible to prevent metal spillage problems and also reduce the mental burden on the operator. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic longitudinal cross-sectional view showing the configuration of an apparatus suitable for application to a converter tapping method according to one embodiment of the present invention. [Figure 2] This graph shows the relationship between the number of times the tapping nozzle is used and the discharge velocity of the tapped steel flow. [Figure 3] This graph shows the relationship between the number of times the steel tap is used and the drop location of the steel flow. [Figure 4] This is a schematic diagram showing the configuration of a converter tapping control device according to one embodiment of the present invention. [Figure 5] This flowchart shows the configuration of a control program for converter tapping steel according to one embodiment of the present invention. [Figure 6] This graph shows the appropriate range of ladle position calculated according to the tilt angle of the converter in the examples and comparative examples of the present invention. [Modes for carrying out the invention]

[0014] The embodiments of the present invention will be described in detail below. The following embodiments are illustrative of equipment and methods for realizing the technical idea of ​​the present invention, and do not limit the configuration to those described below. That is, the technical idea of ​​the present invention can be modified in various ways within the technical scope described in the claims.

[0015] [First Embodiment] <Method for tapping steel in a converter> The first embodiment of the present invention relates to a method for tapping steel from a converter, and its configuration will be described in detail below. Figure 1 is a schematic longitudinal cross-sectional view showing the configuration of an apparatus suitable for application to the converter tapping method according to this embodiment. In the example in Figure 1, the furnace body of the converter 1 is tilted to a predetermined tilting angle, causing the molten steel inside the converter 1 to be discharged from the tapping port 2 of the converter 1 and received in a ladle 4 located diagonally below the converter 1. Here, in Figure 1, the reference numeral "3" represents the tapped steel flow that has flowed out from the tapping port 2 of the converter 1.

[0016] The tapping method for a converter according to this embodiment mainly includes (1) a first step of determining an appropriate range for the ladle position according to the tilt angle of the converter, and (2) a second step of issuing an alarm when the ladle position falls outside the appropriate range. Each step will be described in detail below.

[0017] (first step) In the first step of the tapping method for a converter according to this embodiment, substantially only the tilt angle of the converter is used as a variable, and the appropriate range of the ladle position is determined according to the tilt angle of the converter. Specifically, the center position of the ladle (ladle position) when the tilt axis center of the converter is set to 0 is X l Let [m] be the center of the tilt axis of the converter. Also, when the tilt axis center of the converter is set to 0, the center position of the tapping flow when the tapping flow reaches the upper end of the ladle is X f Let [m] be the inner diameter of the upper end of the ladle. Furthermore, let d be the inner diameter of the upper end of the ladle. L Let [m] be the inner diameter of the protruding part be d HLet [m] be the value. The ladle position can be determined to be within the appropriate range if these values ​​satisfy Equation 1 below. Here, the ladle position refers to the horizontal position of the center of rotational symmetry of the ladle. Note that the above X f Since this is the center position of the steel flow discharged from the tapping port, ladle position X l Taking this into consideration, it is preferable to add the length of the inner diameter of the tapping opening when making the determination. The appropriate range for the ladle position is determined by taking into account that the diameter of the tapping flow will increase to about twice the inner diameter of the tapping opening by the time it reaches the upper end of the ladle.

[0018]

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[0019] Here, in Equation 1, the center position X of the steel flow f [m] is calculated using the following formula 2.

[0020]

number

[0021] Here, the straight line connecting the center of the converter's tilt axis and the tapping port is specifically the straight line connecting the center of the converter's tilt axis and the intersection point (steel shell position) of the converter's steel shell and the central axis of the tapping port. Also, in equation 2, V f The coefficient of cosθ is TIFF2026047112000007.tif20166 is the time [seconds] it takes for the tapping flow to reach the top of the ladle, and it is a positive value.

[0022] In Equation 2, the discharge velocity V of the steel flow f [m / s] is calculated using the following equation 3. Here, in equation 3, ρ steel Molten steel density [t / m³] 3 ] is approximately 7 t / m 3 That is the case.

[0023]

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[0024] In equations 1 to 3 above, most of the variables other than θ, which is the tilt angle of the converter, are either determined by the equipment connections or are easy to measure. However, the discharge velocity V of the tapped steel flow f It is considered a variable that is neither of the above and is difficult to measure. Discharge rate V of the steel flow fThis can be considered an important variable because its horizontal component cannot be ignored. For example, if the ladle is positioned so that its center is directly below the tapping opening without considering the horizontal movement of the tapping flow, there is a risk that the molten steel will flow out of the ladle.

[0025] Figures 2 and 3 are graphs showing the relationship between the number of uses of the tapping nozzle and the discharge velocity of the tapping flow, and the relationship between the number of uses of the tapping nozzle and the drop position of the tapping flow, respectively. Here, the drop position of the tapping flow (the center position of the tapping flow when it reaches the top of the ladle [m]) was calculated with a tilt angle of 70°. As shown in Figure 2, as the number of uses of the tapping nozzle increased, the tapping nozzle wore down, and the discharge velocity of the tapping flow increased (a change of up to about 10 m / min). In contrast, the drop position of the tapping flow showed only a slight change (a change of a few mm), and from the perspective of the effect on the drop position of the tapping flow, the discharge velocity V of the tapping flow f It could be argued that a review of V is unnecessary. However, if V f When set to =0, the calculated drop position of the steel flow is 3.36m, resulting in an error of approximately 0.8m, therefore V f The value itself is necessary.

[0026] In this embodiment, the discharge rate V of the steel flow f The amount of steel produced M is calculated by the above equation 3, where all the variables in equation 3 are determined by the equipment connections or are easy to measure, and pi (π) is a widely known constant. steel and the steeling time T tap Based on past performance, the discharge speed V of the steel flow f This can be easily calculated.

[0027] Here, the discharge rate of the tapping flow is the amount of molten steel out per unit time, and it is kept constant within one charge to minimize fluctuations. However, it is thought that the discharge rate of the tapping flow changes each time the inner diameter of the tapping port changes.

[0028] Furthermore, the above-mentioned steel extraction time T tapThis refers to the cumulative time from when the molten steel begins to flow out of the tapping port until the furnace body is raised and tapping is completed. During the tapping time, tapping will be performed regularly. Specifically, as the number of converter uses increases, the tapping time will decrease, but this can be accumulated as an operational variable and cumulative learning can be performed from previous charge data, etc. The above tapping time will change depending on the number of times the tapping port is used.

[0029] As described above, the appropriate range for the ladle position can be theoretically determined based on equations 1 to 3 above, and essentially only the tilt angle of the converter is used as a variable. This makes it possible to expand the appropriate range for the ladle position to a range that has not been used in actual operation in the past, and is expected to increase the degree of freedom in operation.

[0030] Thus, in the first step, the appropriate range for the center position of the ladle (ladle position) placed on the steel support trolley (not shown) is determined by using essentially only the tilt angle of the converter as a variable. As a result, the appropriate range for the ladle position can be easily set by adopting the range that has been proven for tilt angle and corresponding ladle position during actual operation over a certain period. Furthermore, as described above, in the first step, the ladle position satisfies all the conditions determined by equations 1 to 3 above.

[0031] (Second process) In the second step of the tapping method for the converter according to this embodiment, an alarm is issued when the ladle position falls outside the appropriate range. Specifically, a predetermined alarm system is used to notify the operator during operation that the ladle position has moved outside the proper range. This alarm system may include both visual and auditory alarms. Examples of visual alarms include error messages displayed on the screens of display devices, alert messages displayed on the screens of terminals such as tablets, which can be visually recognized by the operator. Examples of auditory alarms include alarm sounds and voice error messages, which can be audibly recognized by the operator. Furthermore, depending on the usage situation, two or more types of alarm means may be used in combination from the examples of visual and auditory alarms described above, or visual and auditory alarms may be used in combination. In addition, from the viewpoint of improving safety, the system may be configured to notify not only the operator but also multiple people involved in the operation, including the operator, simultaneously via communication means, and the fact that an alarm has been issued may be stored as a record in a memory or other storage means.

[0032] Here, after an alarm is issued, the operator who recognizes the alarm may manually adjust the tilt angle of the converter so that the ladle position is within the appropriate range, or as an extended function, the tilt angle may be automatically adjusted.

[0033] Traditionally, operators were forced to adjust the ladle position based on experience and visual inspection before performing the tapping operation. However, in this embodiment, by configuring the system to issue an alarm when the ladle position falls outside the appropriate range, the mental burden on the operator is reduced, and problems such as molten steel spilling out of the ladle due to incorrect tilting during tapping in the converter can be prevented.

[0034] As described above, the tapping method for the converter according to this embodiment eliminates the need for equipment modifications when performing tapping during converter operation. Essentially, the appropriate range for the ladle position is determined using only the tilt angle of the converter as a variable, and an alarm is issued when the ladle position falls outside this appropriate range. This makes it possible to prevent metal spillage problems and also reduces the mental burden on the operator.

[0035] [Second Embodiment] <Control device for steel tapping from converters> A second embodiment of the present invention relates to a control device for converter tapping, and its configuration will be described in detail below. As shown in Figure 4, the converter tapping control device 100 according to this embodiment includes an input unit 101 for inputting operational information including the tilt angle of the converter, a storage unit 102 for storing the operational information input to the input unit, a calculation unit 103 for determining an appropriate range for the ladle position based on the operational information stored in the storage unit, and an alarm unit 104 for issuing an alarm when the ladle position deviates from the appropriate range determined by the calculation unit. Each unit will be described in detail below.

[0036] The input unit 101 described above is for inputting operational information, including the tilt angle of the converter. Specifically, examples of input devices include keyboards, touch panels, and various magnetic readers. The operational information input to the input unit 101 includes the various variables and constants in formulas 1 to 3 described in the first embodiment. After inputting the operational information into the input unit 101, it is output to the storage unit 102. As described in the first embodiment, most of the variables other than θ, which is the tilt angle of the converter, are either determined by the equipment connections or are easy to measure. Also, the discharge velocity V of the tapped steel flow, which is obtained by equation 3 above. f Also, the amount of steel produced M steel and the steeling time T tap This can be easily calculated from past performance data. As a result, in the converter tapping control device 100 according to this embodiment, essentially only the tilt angle θ of the converter is used as a variable. Here, for operational information, variables determined by equipment connections and other factors that do not require repeated measurement, the system may be configured to read values ​​already stored in the memory unit 102, which will be described later.

[0037] The storage unit 102 described above is for storing the operation information input to the input unit 101, and specifically, for example, a configuration using various types of memory or storage can be cited. The storage unit 102 stores the input operation information and outputs the operation information to the calculation unit 103, which will be described later.

[0038] The calculation unit 103 described above is for determining the appropriate range of the ladle position based on the operation information stored in the storage unit 102. Specifically, it can be configured to perform various calculations such as arithmetic and logical operations. Based on the various operation information from the storage unit 102, the calculation unit 103 determines the appropriate range of the ladle position using the above formulas 1 to 3, similar to the first embodiment, and outputs the information to the alarm unit 104 described later if the ladle position falls outside the appropriate range.

[0039] The alarm unit 104 is for issuing an alarm when the ladle position deviates from the appropriate range defined by the calculation unit 103. Specifically, it issues an alarm when information indicating that the ladle position has deviated from the appropriate range is input from the calculation unit 103. The alarm unit 104 may be configured to use one or more visual and / or auditory alarms, as described in the first embodiment. More specifically, as in the first embodiment, means such as error messages displayed on the screen of a display device, alert messages displayed on the screen of a terminal such as a tablet, alarm sounds, and voice error messages may be used. Furthermore, the system may be configured to store the fact that an alarm has been issued as a record in the storage unit 102, and the alarm notification method may also be the same as that described in the first embodiment.

[0040] Furthermore, the converter tapping control device 100 according to this embodiment may include one or more control units 105 for controlling the output from the input unit 101 to the storage unit 102, the output from the storage unit 102 to the calculation unit 103, the output from the calculation unit 103 to the alarm unit 104, and the operation of the communication unit 106 described below.

[0041] Furthermore, if the system is configured to simultaneously notify multiple people involved in the operation, including the operator, of an alarm, the converter tapping control device 100 according to this embodiment may further include a communication unit 106 having communication means. The communication unit 106 may be connected by wire or wireless to an alarm output device (not shown) of the alarm unit 104 or to an external measuring device (not shown) for measuring the ladle position.

[0042] Here, as with the first embodiment described above, after an alarm is issued, the operator who recognizes the alarm may manually adjust the tilt angle of the converter so that the ladle position falls within the appropriate range, or as an extended function, the tilt angle may be automatically adjusted.

[0043] As described above, the converter tapping control device according to this embodiment does not require any modifications to the equipment, and essentially uses only the tilt angle of the converter as a variable to determine the appropriate range for the ladle position, and is configured to issue an alarm when the ladle position falls outside this appropriate range. From this viewpoint, the same effects as the first embodiment can be obtained in this embodiment.

[0044] [Third Embodiment] <Control program for converter tapping steel> A third embodiment of the present invention relates to a control program for converter tapping, and its configuration will be described in detail below. Figure 5 is a flowchart showing the configuration of the converter tapping control program according to this embodiment. As shown in Figure 5, the converter tapping control program according to this embodiment causes the computer to execute each step in the converter tapping method described in the first embodiment above. Specifically, the control program according to this embodiment causes the computer to execute (1) a first step of determining an appropriate range for the ladle position according to the tilt angle of the converter, and (2) a second step of issuing an alarm when the ladle position falls outside the appropriate range. Each step will be described in detail below.

[0045] In the first step executed by the computer, the appropriate range of ladle positions is determined according to the tilt angle of the converter. Specifically, as in the first and second embodiments described above, the appropriate range of ladle positions is determined using equations 1 to 3. In this embodiment as well, most of the variables other than θ, which is the tilt angle of the converter, are either determined by the equipment connections or are easy to measure. Also, the discharge velocity V of the tapped steel flow, which is determined by equation 3 above, f Also, the amount of steel produced M steel and the steeling time T tapThis can be easily calculated from past performance data. As a result, in the converter tapping control program according to this embodiment, essentially only the tilt angle θ of the converter is used as a variable.

[0046] In the second step, which is performed by the computer, an alarm is issued when the ladle position falls outside the appropriate range. The alarm may be configured to use one or more visual and / or auditory alarms, as described in the first and second embodiments. More specifically, as described above, means such as error messages displayed on the screen of a display device, alert messages displayed on the screen of a terminal such as a tablet, alarm sounds, and voice error messages may be used. The system may also be configured to store a record of when an alarm has been issued, and the method of notifying the alarm may be the same as that described in the first embodiment.

[0047] Here, as with the first and second embodiments described above, after an alarm is issued, the operator who recognizes the alarm may manually adjust the tilt angle of the converter so that the ladle position falls within the appropriate range, or the system may be configured to automatically adjust the tilt angle as an extended function.

[0048] As described above, the converter tapping control program according to this embodiment does not require any modifications to the equipment, and essentially uses only the tilt angle of the converter as a variable to determine the appropriate range for the ladle position, and is configured to issue an alarm when the ladle position falls outside this appropriate range. From this viewpoint, the same effects as those of the first and second embodiments can be obtained in this embodiment. [Examples]

[0049] The present invention will be described in detail below based on examples and comparative examples. However, the present invention is not limited to the examples shown below.

[0050] Figure 6 is a graph showing the appropriate range of ladle position (center position of the ladle placed on the steel receiving trolley) calculated according to the tilt angle of the converter in the embodiment and comparative example of the present invention. When the converter tapping method according to the present invention was applied to existing equipment, the appropriate range of ladle position was as shown in Figure 6. Here, the various variables in the existing equipment are as follows. θ H =43°, d H =180mm, H=7m, L a =2.7m, L b =2.6m, L c =3.8m, M steel =240t, T tap =410s

[0051] <Examples> As a result of introducing the converter tapping method according to the present invention, troubles of molten steel spilling out of the ladle due to incorrect tilting operation during tapping in the converter have been eliminated. Specifically, an alarm sounds when the ladle position exceeds the upper limit [m] or falls below the lower limit [m] of the appropriate range of ladle position corresponding to each tilting angle of the converter, thereby preventing molten steel spill troubles. In this embodiment, after the alarm sounded, the operator who recognized the alarm manually adjusted the tilting angle of the converter so that the ladle position remained within the appropriate range. This confirmed that the method according to the present invention can contribute to suppressing molten steel spill troubles.

[0052] <Comparative Example> In the comparative example, which was a case prior to the introduction of the converter tapping method according to the present invention, problems with molten steel spilling out of the ladle due to incorrect tilting during tapping in the converter frequently occurred. Specifically, the following cases were observed. In all of these cases, the direct cause appears to be that the ladle position was outside the appropriate range, but no alarm was issued and operation continued.

[0053] For example, there have been instances where the converter tilted instantaneously, causing molten steel to spill out of the ladle. In that instance, the ladle position was outside the appropriate range according to the converter's tilt angle, but the operator was not notified by an alarm or other means, thus failing to prevent the molten steel spill problem.

[0054] Furthermore, instances were observed where molten steel spilled out of the ladle due to an accelerated tilting of the converter. Even in that instance, the ladle position was outside the appropriate range according to the converter's tilt angle, but the operator was not notified by an alarm or other means, thus failing to prevent the molten steel spill problem.

[0055] Furthermore, there have been instances where the molten steel flow was so severe that it was impossible to see the tapping flow, and molten steel leaked out of the ladle. Even in that instance, the molten steel flow could not be clearly seen due to the smoke, and although the ladle position was outside the appropriate range corresponding to the converter's tilt angle, the operator was not notified by an alarm or other means, thus failing to prevent the molten steel spill problem. [Industrial applicability]

[0056] The converter tapping method, converter tapping control device, and converter tapping control program according to the present invention are useful in the steel industry for tilting the furnace body of a converter to receive molten steel into a ladle on a receiving trolley. Furthermore, since the upper and lower limits within the appropriate range of the ladle position refer to the distance between the ends of the ladle's inner diameter, it is possible to safely and efficiently homogenize the alloy composition by operating the receiving trolley while referring to this appropriate range when tossing the ladle after adding the ferroalloy during the tapping process. Here, "stirring the ladle after adding ferroalloy during tapping" refers to stirring the molten steel in the ladle by repeatedly moving the ladle back and forth, within the limits that prevent the tapping flow from flowing out of the ladle, with the aim of homogenizing the alloy components. [Explanation of symbols]

[0057] 1 Converter 2 Steel tapping port 3 Steel tapping style 4 ladle 100 Control device for converter tapping 101 Input Section 102 Storage section 103 Arithmetic section 104 Alarm section 105 Control Unit 106 Communications Department

Claims

1. A method for tapping steel from a converter, wherein the molten steel in the converter is discharged from the tapping port of the converter by tilting the furnace body of the converter, and the ladle position is adjusted to receive the steel in a ladle on a receiving trolley, A first step is to determine the appropriate range for the ladle position according to the tilt angle of the converter, A second step involves issuing an alarm when the ladle position deviates from the appropriate range, A method for tapping steel from a converter, characterized by including the following:

2. The method for tapping steel in a converter according to claim 1, characterized in that the discharge rate of the tapping flow is used as a variable in the first step.

3. The method for tapping steel from a converter according to claim 1, characterized in that, in the first step, the appropriate range of the ladle position is determined using the following formulas 1 to 3. [Math 1] (In formula 1, X ｌ This represents the center position [m] of the ladle in the horizontal direction, with the tilt axis center of the converter being 0, and X ｆ d represents the center position [m] of the tapping flow when it reaches the upper end of the ladle, with the tilt axis center of the converter being 0 in the horizontal direction, and d Ｌ represents the inner diameter [m] of the upper end of the ladle, and d Ｈ (This represents the inner diameter [m] of the aforementioned steel outlet.) [Math 2] (In Formula 2, θ represents the tilting angle [°] of the converter when the upright posture of the converter is set to 0, and θ Ｈ represents the angle [°] formed by the straight line connecting the tilting axis center of the converter and the tapping hole with the horizontal axis when the converter is in the upright posture, H represents the vertical distance [m] from the tilting axis center of the converter to the upper end of the ladle, and L ａ represents the horizontal distance [m] from the tilting axis center of the converter to the tapping hole in the outer peripheral direction of the converter, and L ｂ represents the vertical distance [m] from the tilting axis center of the converter to the tapping hole in the upward direction of the furnace top of the converter, and L ｃ represents the distance [m] of the straight line connecting the tilting axis center of the converter and the tapping hole, V ｆ represents the discharge speed [m / s] of the tapping flow, and g represents the gravitational acceleration [m / s ２ ²].) [Math 3] (In formula 3, M ｓｔｅｅｌ represents the amount of steel produced [t], T ｔａｐ represents the steeling time [s], ρ ｓｔｅｅｌ The density of molten steel [t / m³] ３ ] represents, d Ｈ (where represents the inner diameter [m] of the aforementioned steel outlet, and π represents the ratio of a circle's circumference to its diameter.)

4. The method for tapping steel from a converter according to claim 3, characterized in that, in the first step, the ladle position satisfies all the conditions determined by formulas 1 to 3.

5. A converter tapping control device used to tilt the furnace body of the converter to discharge molten steel from the tapping port of the converter, and to adjust the position of the ladle to receive the steel into a ladle on a receiving trolley, An input unit for inputting operational information, including the tilt angle of the converter, A storage unit for storing the operation information input to the input unit, A calculation unit that determines an appropriate range for the ladle position based on the operation information stored in the memory unit, An alarm unit that issues an alarm when the ladle position deviates from the appropriate range defined by the calculation unit, A control device for converter tapping steel, characterized by comprising the following features.

6. The converter tapping control device according to claim 5, characterized in that the aforementioned operational information includes the discharge speed of the tapped steel flow.

7. The converter tapping control device according to claim 5, characterized in that the calculation unit determines an appropriate range for the ladle position using the following formulas 1 to 3. [Math 4] (In formula 1, X ｌ This represents the center position [m] of the ladle in the horizontal direction, with the tilt axis center of the converter being 0, and X ｆ d represents the center position [m] of the tapping flow when it reaches the upper end of the ladle, with the tilt axis center of the converter being 0 in the horizontal direction, and d Ｌ represents the inner diameter [m] of the upper end of the ladle, and d Ｈ (This represents the inner diameter [m] of the aforementioned steel outlet.) [Math 5] (In Equation 2, θ represents the tilt angle [°] of the converter when the upright position of the converter is set to 0, θ Ｈ H represents the angle [°] between the horizontal axis and the straight line connecting the center of the tilt axis of the converter and the tap opening when the converter is in an upright position, H represents the vertical distance [m] from the center of the tilt axis of the converter to the upper end of the ladle, and L ａ L represents the horizontal distance [m] from the center of the tilt axis of the converter toward the outer circumference of the converter to the tapping opening, ｂ L represents the vertical distance [m] from the center of the tilt axis of the converter to the tapping port in the direction of the furnace upwards of the converter, ｃ V represents the distance [m] of the straight line connecting the center of the tilt axis of the converter and the tapping port, ｆ g represents the discharge velocity of the steel flow [m / s], and g is the acceleration due to gravity [m / s] ２ ] represents. [Math 6] (In formula 3, M ｓｔｅｅｌ represents the amount of steel produced [t], T ｔａｐ represents the steeling time [s], ρ ｓｔｅｅｌ The density of molten steel [t / m³] ３ ] represents, d Ｈ (where represents the inner diameter [m] of the aforementioned steel outlet, and π represents the ratio of a circle's circumference to its diameter.)

8. A control program for tapping steel in a converter, characterized in that it causes a computer to execute each step of the tapping steel method for a converter described in any one of claims 1 to 4.

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