Method for estimating removal amount of flame scarfing slag, method for removing flame scarfing slag, method for producing slab, and device for removing flame scarfing slag

Abstract

To provide a method for estimating a removal amount of flame scarfing slag from a slab on the basis of setting related to spraying of jet water and other methods.SOLUTION: There is provided a method for estimating the removal amount of flame scarfing slag when removing the flame scarfing slag generated by scarfing a slab by spraying jet water. The method for estimating the removal amount of flame scarfing slag comprises: an information generation step of generating information including the momentum of the jet water according to the spray angle of the jet water, the momentum of the flame scarfing slag corresponding to the momentum of the jet water, and the distance required for removal of the flame scarfing slag; and an estimation step of estimating the removal amount of the flame scarfing slag on the slab on the basis of the information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for estimating the amount of cut cutting slag removed when the cut cutting slag generated by scarfing a slab is removed by spraying jet water, a method for removing cut cutting slag, a method for manufacturing a slab, and an apparatus for removing cut cutting slag. [Background technology]

[0002] Steel billets such as slabs produced in steelworks have surface defects that adversely affect product quality and are therefore removed before being transported to the rolling process. Scarfing equipment is used to remove the defects. The process of removing defects is also called scarfing or slag cutting. During scarfing, the billet is slag cut, producing slag cutting slag. The slag cutting slag is removed from the slab by spraying a water jet.

[0003] However, if treatment with the water jet is insufficient and hot cutting slag remains on the surface of the slab when it comes into contact with water, water vapor may be generated, causing problems that may affect the operation of the equipment.

[0004] Therefore, the amount of slag that can be removed by the water jet is adjusted according to the amount of slag that can be removed by the water jet, and the amount of slag that can be removed by the water jet is estimated according to the amount of slag that can be removed by the water jet in actual operation.

[0005] Estimating the amount of slag removed during actual operation is not only inefficient, but also has the problem that it cannot be used as a guideline when designing new water jet injection equipment because the specifications will be different from existing equipment.

[0006] Therefore, the amount of removed slag is estimated using the water pressure and water volume of the jet water. Specifically, Patent Document 1 discloses a method of estimating the amount of removed slag using the law of conservation of momentum with the water volume and pressure of the jet water as factors. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2003-299988 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, for example, if the angle of the nozzle that ejects the jet water with respect to the surface of the slab, i.e., the jet water ejection angle, is too large, it becomes difficult for the jet water to contact the slab uniformly in the width direction, resulting in a problem that the slag on the surface of the slab cannot be sufficiently removed.

[0009] When estimating the amount of cut slag removed using the method disclosed in Patent Document 1, the injection angle of the jet water is not taken into account, so there is a risk of a discrepancy between the actual amount of cut slag removed and the estimated amount of cut slag removed.

[0010] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a method for estimating the amount of cut slag removed from a slab based on settings regarding the injection of jet water. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention has the following features.

[0012] [1] A method for estimating a removal amount of slag, which estimates a removal amount of slag generated by scarfing a slab by spraying jet water to remove the slag, comprising: an information generating step of generating information including a momentum of the jet water according to an injection angle of the jet water, a momentum of the thermal cutting slag corresponding to the momentum of the jet water, and a distance required to remove the thermal cutting slag; A method for estimating the amount of removed cutting slag, comprising: an estimation step of estimating the amount of removed cutting slag on the slab based on the information generated in the information generation step. [2] The information generated in the information generating step includes an injection angle of the jet water, a mass of the jet water contacting the cut slag, a flow velocity of the jet water, a momentum efficiency transferred from the jet water to the cut slag at the injection angle of the jet water, a mass of the cut slag, and a moving speed of the cut slag in the injection direction of the jet water, The length of the slab in the direction of jet water is used as the distance required to remove the slag, A method for estimating the amount of removed slag described in [1], in which the momentum of the jet water according to the jet angle of the jet water and the momentum of the cut slag corresponding to the momentum of the jet water are calculated using the following equation (1), and the length of the slab in the jet direction of the jet water satisfies the following equation (2). εθ×mn×vn1=M×vn2 (1) Σvn2×Δy / v0=ΣLn≧W (2) W: Length of the slab in the direction of the water jet ΣLn: Cumulative travel distance of slag εθ: The ratio of the momentum that must be transferred from the jet water to the slag to remove it at the jet angle θ mn: mass of the jet water vn1: flow velocity of the jet water M: Mass of slag vn2: The moving speed of the slag in the direction of the jet water Δy: Micro thickness of the slag v0: Feed rate of the slab [3] A method for removing slag from a slab by spraying a jet of water, comprising the steps of: [1] or [2], using the method for estimating the amount of removal of the slag on the slab; a setting step of setting a setting related to the injection of the jet water based on the amount of the removed slag estimated in the estimation step; A method for removing thermal cutting slag, comprising: a removing step of spraying the jet water toward the slab to remove the thermal cutting slag after the setting step is performed. [4] 4. The method for removing spalling slag according to claim 3, wherein in the setting step, the spray angle of the jet water is set to 0.8 to 2.4°. [5] A method for manufacturing a slab, comprising the steps of: manufacturing a slab using the method for removing slag from thermal cuttings described in [3] or [4]. [6] A slag removal device for removing slag from a slab by spraying a jet of water, comprising: A conveying unit that conveys the slab; A jet water ejection unit that ejects jet water toward the slab; an information generating unit that generates information including a momentum of the jet water according to an injection angle of the jet water, a momentum of the thermal cutting slag corresponding to the momentum of the jet water, and a distance required to remove the thermal cutting slag; An estimation unit that estimates a removal amount of the cutting slag based on the information generated by the information generation unit; A setting unit that sets settings regarding the ejection of the jet water from the jet water ejection unit based on the amount of removed cut slag estimated by the estimation unit. Effect of the Invention

[0013] According to the method for estimating the amount of removed slag of the present invention, the amount of removed slag is estimated based on information including the momentum of the jet water according to the jet angle of the jet water, the momentum of the slag corresponding to the momentum of the jet water, and the distance required to remove the slag. Therefore, it is possible to estimate the amount of removed slag from the slab according to the jet angle of the jet water. Therefore, it is possible to improve the accuracy of estimating the amount of removed slag. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is an explanatory diagram showing the configuration of a scarfing facility. [Diagram 2] FIG. 2 is a perspective view of the jet water ejection unit of FIG. 1. [Diagram 3] FIG. 3 is a front view of the jet water nozzle of FIG. 2. [Figure 4] FIG. 2 is an explanatory diagram showing how slag is removed by jet water. [Diagram 5] FIG. 1 is a process flow diagram of a slag removal method. [Figure 6] 1 is a graph showing the relationship between the injection angle of the jet water and the average pressure in the conveying direction of the slab. [Figure 7] 11 is a graph showing the relationship between the injection angle of the jet water, the momentum efficiency, and the limit feed rate ratio. [Figure 8] 1 is a graph showing the relationship between slab width and surface temperature of the slab in an example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a scarfing equipment 100. As shown in Fig. 1, the scarfing equipment 100 has a scarfing device 20 that scarfs a slab 10, a conveying section 30 that conveys the slab 10 to the scarfing device 20, and a hood 40 that covers the conveying section 30 in the vicinity of the scarfing device 20. The scarfing equipment 100 also has a jet water spraying section 50 that sprays jet water toward the slab 10.

[0016] As the scarfing device 20, for example, a gas scarfing device can be used which preheats the portion of the slab 10 to be scarified with combustion gas, and then scarifies the slab 10 by utilizing the oxidation combustion reaction of iron and oxygen.

[0017] The conveying section 30 has conveying rollers 31. The conveying rollers 31 are provided at a predetermined interval along the conveying direction D1 of the slab 10. Each of the conveying rollers 31 is a roller formed in a cylindrical shape. A drive motor 32 is connected to each of the conveying rollers 31. Each of the conveying rollers 31 is preferably provided so as to be rotatable about its axis by the drive motor 32. The conveying section 30 conveys the slab 10 in the conveying direction D1 indicated by the arrow in the figure by rotating the conveying rollers 31 by the drive motor 32. The conveying speed of the slab 10 is controlled by controlling the rotation speed of the drive motor 32.

[0018] The hood 40 is a ventilation canopy having a duct (not shown) connected to the outside of the scarfing equipment 100. The hood 40 exhausts, for example, steam, water vapor, smoke, odors, etc. generated by the scarfing device 20 performing cutting or jet water injection to the outside of the scarfing equipment 100.

[0019] The jet water jetting unit 50 is installed near the scarfing device 20. The jet water jetting unit 50 has a jet water nozzle 51 that jets jet water. The jet water jetting unit 50 jets jet water from the jet water nozzle 51 to blow away the slag and residual slag (hereinafter also referred to as slag) that are generated when the surface of the slab 10 is scarfed. The jet water jetting unit 50 functions as a slag removal device that removes the slag that is generated by scarfing the slab 10.

[0020] The control unit 60 controls the manner in which the jet water is sprayed by the jet water spraying unit 50. The control unit 60 is configured by a computer including a CPU. The control unit 60 has a setting information database (hereinafter, the database may also be referred to as DB) 61 that stores information related to the settings of the jet water spraying unit 50.

[0021] The setting information DB61 stores multiple data such as the width of the slab 10, the feed speed which is the transport speed of the slab 10, the angle which the axis of the jet water nozzle 51 makes with respect to the surface of the slab 10 (hereinafter also referred to as the jet water jet angle), the jet width of the jet water jetted from the jet water nozzle 51, the water pressure, water volume, flow velocity of the jet water, the number of measurement points of the jet water nozzle 51, information on the cutting slag, and the density of the slab.

[0022] The control unit 60 has an information generating unit 62 that generates information including the momentum of the jet water according to the injection angle of the jet water, the momentum of the cutting slag corresponding to the momentum of the jet water, and the distance required to remove the cutting slag based on information stored in the setting information DB 61.

[0023] The control unit 60 has an information acquisition unit 63 that acquires information stored in the setting information DB 61. The control unit 60 has an estimation unit 64 that estimates the amount of the slag to be removed from the slab 10 based on the information acquired by the information acquisition unit 63.

[0024] The control unit 60 has a setting unit 65 that sets the settings related to the ejection of jet water from the jet water ejection unit 50 based on the amount of removed cutting slag estimated by the estimation unit 64. The setting unit 65 can set, for example, the flow velocity of the jet water ejected from the jet water ejection unit 50, the water pressure, and the angle between the axis of the jet water nozzle 51 and the surface of the slab 10. The setting unit 65 also switches between starting and stopping the ejection of the jet water ejected from the jet water nozzle 51.

[0025] Fig. 2 is a perspective view of the jet water spraying unit 50. As shown in Fig. 2, the jet water spraying unit 50 is provided on a stand 52. The stand 52 is formed so that its upper part can be tilted in the vertical direction in the figure. The vertical direction in the figure is the direction along the thickness direction of the slab 10. Therefore, the jet water spraying unit 50 can adjust the spray angle of the jet water by adjusting the tilt angle of the stand 52. The spray angle θ of the jet water is stored as a set value in the setting information DB 61.

[0026] The jet water nozzles 51 of the jet water ejection unit 50 have a plurality of first nozzles 51a arranged on the lower tier side and second nozzles 51b arranged on the upper tier side.

[0027] Three first nozzles 51a are arranged in the left-right direction of the drawing. The left-right direction of the drawing is a direction along the conveying direction D1 of the slab 10. The first nozzles 51a are mainly used to discharge the shavingslag on the surface of the slab 10.

[0028] Three second nozzles 51b are provided to surround the first nozzle 51a provided at the end in the left direction in the figure. The second nozzles 51b are mainly used to discharge the slag scattered by the first nozzles 51a. The first nozzles 51a and the second nozzles 51b can be provided freely depending on the embodiment. For example, the jet water nozzle 51 may be configured with a plurality of first nozzles 51a without providing the second nozzles 51b.

[0029] Fig. 3 is a front view of the jet water nozzle 51. As shown in Fig. 3, the maximum width including the first nozzle 51a and the second nozzle 51b is defined as the jet width B. The jet width B is stored in the setting information DB 61. The measurement points in the figure are positions where the water pressure and flow rate of the jet water are measured. The water pressure and flow rate of the jet water are measured, for example, by a Pitot tube provided in the transfer section 30.

[0030] Fig. 4 shows an embodiment in which the slag is removed by jet water. As shown in Fig. 4, jet water having a jet width B is jetted toward the slab 10. More specifically, the jet water is jetted in a direction perpendicular to the conveying direction D1, i.e., along the direction of the width W of the slab 10. The width W of the slab 10 is stored in the setting information DB 61.

[0031] The feed speed v0 is the speed at which the slab 10 is transported by the transport section 30. The feed speed v0 is stored as a set value in the setting information DB 61. The flow velocity vn1 of the jet water can be obtained, for example, by using Bernoulli's theorem. The flow velocity vn1 of the jet water is stored in the setting information DB 61. In addition, a value measured by a flow meter may be used as the flow velocity vn1 of the jet water.

[0032] The mass mn of the jet water when it comes into contact with the slag is calculated by the flow rate of the jet water (m 3 / s), the density of the water, and the contact time of the jet water with the slag (Δy / v0).

[0033] In this embodiment, the moving speed vn2 of the slag in the injection direction of the jet water (hereinafter also simply referred to as the moving speed of the slag) is the moving speed of the slag in the width W direction of the slab 10. The moving speed vn2 of the slag can be calculated based on the momentum of the jet water and the momentum of the slag, which will be described later.

[0034] The mass M of the slag can be calculated by, for example, the product of the width W of the slab 10, the slag allowance d, the micro thickness Δy, and the density γ. Here, the slag allowance d can be obtained, for example, from the setting value of the machine.

[0035] The minute thickness Δy is the length of the slag in the conveying direction D1 when the slag is considered to be a strip. The minute thickness Δy can be calculated, for example, by the jet width B / the number of measurement points.

[0036] The density γ may be the density of the slab, for example, the density of iron.

[0037] Fig. 5 shows a process flow of the slag removal method. The slag removal method is started by a start operation by the user. As shown in Fig. 5, the information generation unit 62 acquires data necessary for information generation from the setting information DB 61, and executes an information generation step of generating information (step S01).

[0038] The information generating unit 62 calculates the momentum of the jet water according to the jet angle θ of the jet water. The information generating unit 62 calculates, for example, the mass mn of the jet water, the velocity vn1 of the jet water, and the momentum efficiency εθ (hereinafter also referred to as the momentum efficiency at the jet water jet angle θ) which is the ratio of momentum that needs to be transferred from the jet water to the spalling slag in order to remove the spalling slag at the jet water jet angle θ. The information generating unit 62 uses these to calculate the momentum of the jet water according to the jet angle of the jet water. The momentum efficiency at the jet water jet angle θ is derived from the law of conservation of momentum.

[0039] The information generating unit 62 also calculates the momentum of the cut slag corresponding to the momentum of the jet water. For example, the information generating unit 62 calculates the momentum of the cut slag corresponding to the momentum of the jet water by multiplying the mass M of the cut slag by the moving speed vn2 of the cut slag.

[0040] From these values, the information generating unit 62 calculates the amount of each element for which the cumulative movement distance ΣLn of the slag by the jet water is equal to or greater than the width W of the slab 10. The information generating unit 62 stores these data in the setting information DB 61 as generated information. Here, the distance required to remove the slag by the jet water varies depending on the position of the slab 10 on which the slag is located. For example, the distance from one end to the other end of the slab 10 in the direction in which the jet water is sprayed is the longest distance required to remove the slag by the jet water. When the jet water is sprayed in the width W direction of the slab 10, the width W is the longest distance. Therefore, the information generating unit 62 calculates the amount of each element for which the cumulative movement distance ΣLn is equal to or greater than the width W of the slab 10, thereby making it possible to remove slag from various positions.

[0041] The estimation unit 64 uses the data acquired in the information generating step of step S01 to estimate the amount of removed cutting slag and executes the estimation step (step S02).

[0042] In the estimation step of step S02, the estimation unit 64 estimates the mass M of the slag as the amount of slag removed from the momentum of the slag corresponding to the momentum of the jet water. Note that the estimation by the estimation unit 64 is not limited to this embodiment, and for example, the amount of slag removed may be estimated as the amount of slag removed based on the mass M of the slag.

[0043] The amount of removed cut slag estimated in the estimation step of step S02 is stored in the setting information DB 61. Here, the information generating step of step S01 and the estimation step of step S02 are executed, thereby executing the method for estimating the amount of removed cut slag.

[0044] The setting unit 65 performs the setting step by setting the jet water ejection unit 50 using each piece of data according to the amount of removed cut slag estimated in the estimation step of step S02 (step S03).

[0045] The control unit 60 executes the removal step by causing the jet water ejection unit 50 to eject the jet water in the state set in the setting step of step S03 (step S04).

[0046] Generation of information in the information generating step in step S01 will be described. When calculating the momentum of the jet water according to the jet angle of the jet water, the information generating unit 62 obtains the momentum efficiency εθ of the jet water at the jet angle θ as follows.

[0047] For example, when the parameters of the jet water, the slab 10, the slag, and the like have the values ​​shown in Table 1, the momentum efficiency εθ of the jet water at the injection angle θ satisfies the following formulas (3) to (5).

[0048] vn2×t=Ln (3) (εθ×mn×vn1 / M)=Ln / t (4) εθ=(Ln / t)×M / (mn×vn1) (5)

[0049] [Table 1]

[0050] Here, the information generating unit 62 calculates each element so that the cumulative movement distance ΣLn of the cutting slag is equal to or greater than the width W of the slab 10. The cumulative movement distance ΣLn is obtained as a value that satisfies the following formula (6). The feed speed v0 is the conveying speed of the slab 10 by the conveying unit 30. The movement speed Σvn2 of the cutting slag is the movement speed in the spraying direction of the jet water. Σvn2×(Δy) / v0=ΣLn≧W (6)

[0051] The moving speed Σvn2 of the slag is obtained as a value that satisfies the following formula (7), where the integration is performed corresponding to the number (n) of measurement points shown in FIG. εθ×mn×vn1=M×vn2 (7)

[0052] Table 2 shows examples of parameters when the jet water ejection angle θ is 0° and the number of divisions, which is the number of measurement points, is 1 to 16. Here, an example is described where the jet water ejection angle θ is 0°, but similar trends are observed for other jet water ejection angles θ, so a description is omitted. In an example that satisfies the parameters in Tables 1 and 2, the momentum efficiency εθ when the jet water ejection angle θ is 0° is 0.9.

[0053] [Table 2]

[0054] In the setting step of step S03, if the jet angle θ of the jet water is 0°, the setting unit 65 sets the jet water ejector 50 using the parameters listed in Tables 1 and 2.

[0055] In this way, it is possible to obtain parameters for appropriately removing the slag from the cutting tool, i.e., it is possible to estimate an appropriate amount of slag to be removed according to the jet water ejection mode of the jet water ejection unit 50.

[0056] According to the method for estimating the amount of removed slag of the present invention, the amount of removed slag is estimated based on information including the momentum of the jet water according to the jet angle of the jet water, the momentum of the slag corresponding to the momentum of the jet water, and the distance required to remove the slag. Therefore, it is possible to estimate the amount of removed slag from the slab according to the jet angle of the jet water. Therefore, it is possible to improve the accuracy of estimating the amount of removed slag.

[0057] In addition, by removing the cutting slag using a method for estimating the amount of cutting slag to be removed, the slab can be cut in an appropriate cutting manner, thereby making it possible to improve the manufacturing efficiency of the slab.

[0058] Furthermore, the above-mentioned method for removing the thermal cutting slag may be used to manufacture slabs. By manufacturing slabs using such a slab manufacturing method, it is possible to perform thermal cutting appropriately and increase the yield of the slabs.

[0059] In the present embodiment, an example has been described in which the setting information DB 61 is stored in the control unit 60 of the slab removing apparatus 100. The setting information DB 61 may be provided in a device other than the slab removing apparatus 100, such as a server device. EXAMPLES

[0060] The pressure of the jet water in the slab transport direction was measured according to the jet angle. The results are shown in Figure 6. As shown in Figure 6, the average pressure increases from 0° to 1°, and gradually decreases from 1° to 10°. Therefore, the pressure of the jet water transmitted to the slag varies depending on the jet angle θ of the jet water.

[0061] Figure 7 shows the jet water injection angle θ, the momentum efficiency εθ at the jet water injection angle θ, and the limit cutting allowance dmax. The momentum of the jet water changes depending on the jet water injection angle θ. That is, as shown in Figure 7, the momentum efficiency εθ at the jet water injection angle θ changes depending on the jet water injection angle θ.

[0062] Considering the momentum efficiency εθ at the ejection angle θ of the jet water shown in FIG. 7, a suitable range of the ejection angle θ of the jet water is a range in which the momentum efficiency εθ is 0.8 or less, for example, 0.8° to 2.4°.

[0063] Furthermore, the limit cutting allowance dmax when the jet water injection angle θ is 1° is 4.4 mm. The momentum efficiency εθ when the jet water injection angle θ is 0° is 0.90, and when it is 1° it is 0.76.

[0064] The momentum efficiency εθ when the jet water injection angle θ is 1° is improved by 14% compared to when it is 0°. Here, the improvement in momentum efficiency εθ can be added directly to the slag cutting allowance d. In other words, since the slag cutting allowance d when the jet water injection angle θ is 0° is 4.0 mm, the slag cutting allowance d when the jet water injection angle θ is 1° can be set to 4.4 mm. Therefore, when the jet water injection angle θ is 1°, it is estimated that it is possible to remove the slag cutting slag when slag cutting is performed with the slag cutting allowance d set to 4.4 mm.

[0065] Fig. 8 shows the surface temperature of the slab when the jet angle θ of the jet water is set to 1°. In this test, scarfing was performed on a slab with a width of 950 to 1200 mm with a slab cutting allowance d of 4.4 mm, and the slag was removed using a slag cutting removal device.

[0066] As shown in Figure 8, the slag could be removed without bumping for any slab width. That is, the limit slag removal amount when the jet water injection angle θ was 1° as shown in Figure 7 was 4.4 mm. When slag removal was performed at this limit slag removal amount, the slag removal amount could be appropriately estimated. Therefore, the amount of slag removal could be appropriately estimated. [Explanation of symbols]

[0067] 100 Slab Remover 10. Slab 20 Scarfing Device 30 Conveyor 50 Jet water injection section 51 Jet Water Nozzle 60 Control section 62 Information generation section 64 Estimation part 65 Setting Department

Claims

1. A method for estimating a removal amount of slag, which estimates a removal amount of slag generated by scarfing a slab by spraying jet water to remove the slag, comprising: an information generating step of generating information including a momentum of the jet water according to an injection angle of the jet water, a momentum of the thermal cutting slag corresponding to the momentum of the jet water, and a distance required to remove the thermal cutting slag; A method for estimating the amount of removed cutting slag, comprising: an estimation step of estimating the amount of removed cutting slag on the slab based on the information generated in the information generation step.

2. The information generated in the information generating step includes an injection angle of the jet water, a mass of the jet water contacting the cut slag, a flow velocity of the jet water, a momentum efficiency transferred from the jet water to the cut slag at the injection angle of the jet water, a mass of the cut slag, and a moving speed of the cut slag in the injection direction of the jet water, The length of the slab in the direction of jet water is used as the distance required to remove the slag, 2. A method for estimating the amount of removal of thermal cutting slag as described in claim 1, wherein the momentum of the jet water according to the jet angle of the jet water and the momentum of the thermal cutting slag corresponding to the momentum of the jet water are calculated using the following formula (1), and the length of the slab in the jet direction of the jet water satisfies the following formula (2). εθ×mn×vn1=M×vn2 (1) Σvn2×Δy / v0=ΣLn≧W (2) W: Length of the slab in the direction of the jet water ΣLn: Cumulative travel distance of slag εθ: The ratio of the momentum that must be transferred from the jet water to the slag to remove it at the jet angle θ mn: mass of jet water vn1: flow velocity of jet water M: Mass of slag vn2: The moving speed of the slag in the direction of the jet water Δy: Micro thickness of the slag v0: Feed rate of the slab

3. A method for removing slag from a slab by spraying a jet of water, comprising the steps of: An estimation step of estimating a removal amount of the slag on the slab using the method for estimating a removal amount of the slag according to claim 1 or 2; a setting step of setting a setting related to the injection of the jet water based on the amount of the removed slag estimated in the estimation step; A method for removing thermal cutting slag, comprising: a removing step of spraying the jet water toward the slab to remove the thermal cutting slag after the setting step is performed.

4. The method for removing slag according to claim 3, wherein in the setting step, the injection angle of the jet water is set to 0.8 to 2.4 degrees.

5. A method for producing a slab, comprising the steps of: producing a slab by using the method for removing thermal cutting slag according to claim 3 or 4.

6. A slag removal device for removing slag from a slab by spraying a jet of water, comprising: A conveying unit that conveys the slab; A jet water ejection unit that ejects jet water toward the slab; an information generating unit that generates information including a momentum of the jet water according to an injection angle of the jet water, a momentum of the thermal cutting slag corresponding to the momentum of the jet water, and a distance required to remove the thermal cutting slag; An estimation unit that estimates a removal amount of the cutting slag based on the information generated by the information generation unit; A setting unit that sets settings regarding the ejection of the jet water from the jet water ejection unit based on the amount of removed cut slag estimated by the estimation unit.

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