Apparatus for estimating the amount of slag in a furnace, method for estimating the amount of slag in a furnace, and method for producing molten steel

Abstract

An in-furnace slag amount estimation device (1), which estimates the weight of slag remaining in a furnace when some or all of the slag remaining in the furnace of a converter is carried over to a next blowing process in the converter after tapping out from a previous blowing process, comprises: an input unit (11) to which input data is input; a slag bulk density calculation unit (13) that uses the input data and a slag bulk density estimation model to calculate the bulk density of slag remaining in the furnace; a slag volume calculation unit (14) that uses slag height data, furnace internal shape data, and a slag volume estimation model to calculate the volume of the slag remaining in the furnace; and a slag weight calculation unit (15) that uses the calculated bulk density of the slag and the calculated volume of the slag to calculate the weight of the slag remaining in the furnace.

Description

[Technical Field]

[0001] The present disclosure relates to an in-furnace slag amount estimation device, an in-furnace slag amount estimation method, and a molten steel manufacturing method, and more particularly to an in-furnace slag amount estimation device, an in-furnace slag amount estimation method, and a molten steel manufacturing method that estimate the weight of slag remaining in a furnace in a refining facility in the steel industry. [Background technology]

[0002] In steelworks, the composition and temperature of molten iron tapped from the blast furnace are adjusted in refining equipment, including pretreatment equipment, converters, and secondary refining facilities. Converters, which inject oxygen into the furnace to remove impurities and raise the temperature, play a crucial role in steel quality control and cost reduction. To protect refractories and reduce fluxes, the most common method for converters is to carry over the slag from a previous blow to the next blow in the same converter. This method involves adjusting the amount of auxiliary materials, such as lime, added to achieve the desired slag composition in the next blow based on the slag composition at the end of the previous blow and the weight of the carried-over slag. Traditionally, operators either visually estimate the amount of slag discharged from the furnace or weigh the ladle used to receive the discharged slag and calculate the weight of the carried-over slag, which is then used to determine the amount of auxiliary materials added to the next blow. However, the slag during the blowing process is in a foamy state due to CO gas and other gases generated by reactions in the furnace, and its bulk density fluctuates greatly, making visual estimations inaccurate. It is also difficult to prevent the slag from overflowing the ladle when the slag is discharged. Furthermore, the influence of the metal that flows out during slag discharge and the iron particles in the slag cannot be eliminated, so the accuracy of slag weight measurement using a weighing scale is often low. This low accuracy in estimating the weight of the slag carried over tends to lead to excessive addition of auxiliary materials in the next blowing process, which can lead to increased costs and reduced yields.

[0003] Patent Document 1 discloses a method for estimating the settling characteristics of the slag in the furnace by measuring the slag height in the furnace multiple times before slag discharge, and estimating the weight of the slag carried over based on the settling characteristics and the tilting pattern of the converter during slag discharge. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 129887 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, the weight of the slag after slag discharge is calculated based on the slag volume in the converter, which is geometrically calculated from the settling characteristics during slag discharge and the tilting angle of the converter. For example, if the shape of the converter throat changes due to wear of refractory bricks or the adhesion of metal, the relationship between the tilting angle of the converter and the slag volume in the converter changes, and the estimated slag weight in the converter deviates from the actual value. Furthermore, the shape of the converter throat may change due to the adhesion of metal even during a single blowing process. Therefore, it is difficult to consistently obtain accurate shape information. Thus, it is difficult to accurately estimate the weight of the slag in the converter after slag discharge using a method of geometrically calculating the slag volume in the converter from the tilting angle of the converter.

[0006] In view of the above circumstances, an object of the present disclosure is to provide an in-furnace slag amount estimation device, an in-furnace slag amount estimation method, and a molten steel manufacturing method that are capable of estimating the weight of slag carried over to the next blowing process with high accuracy. [Means for solving the problem]

[0007] (1) An in-furnace slag amount estimation device according to an embodiment of the present disclosure includes: An in-furnace slag amount estimation device that estimates a weight of slag remaining in a converter when part or all of the slag remaining in the converter after tapping of a previous blowing process is carried over to a next blowing process in the converter, an input unit into which input data including furnace interior shape data indicating the shape of the furnace interior, data on the composition and temperature of the slag remaining in the furnace, and slag height data indicating the height of the slag remaining in the furnace is input; a slag bulk density calculation unit that calculates the bulk density of the slag remaining in the furnace using the input data and a slag bulk density estimation model; a slag volume calculation unit that calculates the volume of slag remaining in the furnace using the slag height data, the furnace interior shape data, and a slag volume estimation model; and a slag weight calculation unit that calculates the weight of the slag remaining in the furnace using the calculated bulk density of the slag and the calculated volume of the slag.

[0008] (2) As one embodiment of the present disclosure, in (1), The slag volume estimation model calculates the furnace volume from the hearth bottom to the height of the slag remaining in the furnace based on the furnace shape data and the slag height data generated based on measurements of the converter before the previous blowing process was performed.

[0009] (3) As an embodiment of the present disclosure, in (1) or (2), The slug height data is measured by a microwave distance meter.

[0010] (4) A method for estimating the amount of slag in a furnace according to an embodiment of the present disclosure includes: A method for estimating the amount of slag remaining in a converter, when part or all of the slag remaining in the converter after the tapping of a previous blowing process is carried over to a next blowing process in the converter, comprising: an input step in which input data including furnace interior shape data indicating the shape of the furnace interior, data on the composition and temperature of slag remaining in the furnace, and slag height data indicating the height of slag remaining in the furnace is input; a slag bulk density calculation step of calculating the bulk density of the slag remaining in the furnace using the input data and a slag bulk density estimation model; a slag volume calculation step of calculating the volume of slag remaining in the furnace using the slag height data, the furnace interior shape data, and a slag volume estimation model; and a slag weight calculation step of calculating the weight of the slag remaining in the furnace using the calculated bulk density of the slag and the calculated volume of the slag.

[0011] (5) As an embodiment of the present disclosure, in (4), The slag volume estimation model calculates the furnace volume from the hearth bottom to the height of the slag remaining in the furnace based on the furnace shape data and the slag height data generated based on measurements of the converter before the previous blowing process was performed.

[0012] (6) As an embodiment of the present disclosure, in (4) or (5), The slug height data is measured by a microwave distance meter.

[0013] (7) A method for producing molten steel according to an embodiment of the present disclosure includes: Based on the weight of slag remaining in the furnace calculated by any one of the methods for estimating the amount of slag in the furnace (4) to (6), the amount of auxiliary materials to be charged in the next blowing process is determined, and refining operations are carried out to produce molten steel. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to provide an in-furnace slag amount estimation device, an in-furnace slag amount estimation method, and a molten steel manufacturing method that are capable of estimating the weight of slag carried over to the next blowing process with high accuracy. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an in-furnace slag amount estimation device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a flowchart showing the process of a method for estimating the amount of slag in a furnace according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an apparatus for estimating the amount of slag in a converter, a method for estimating the amount of slag in a converter, and a method for producing molten steel according to an embodiment of the present disclosure will be described with reference to the drawings. Here, the amount of slag in a converter refers to the weight of slag remaining inside the converter.

[0017] 1 is a schematic diagram showing the configuration of an in-furnace slag amount estimation device 1 according to an embodiment of the present disclosure. In this embodiment, the in-furnace slag amount estimation device 1 is used as part of a facility for producing molten steel. The facility for producing molten steel includes refining equipment and a blowing control system including the in-furnace slag amount estimation device 1.

[0018] As shown in FIG. 1, the refining equipment includes a converter 100, a lance 103, an upper hopper 104, and a slag height measuring device 105. The lance 103 is disposed above the molten metal 101 in the converter 100. High-pressure oxygen is ejected from the tip of the lance 103 toward the molten metal 101 below. This high-pressure oxygen oxidizes impurities in the molten metal 101 and entrains them in the slag 102 (refining process). In addition, auxiliary materials including lime, recarburizers, coolants, etc. are introduced into the converter 100 from the upper hopper 104 and entrained in the molten metal 101 and slag 102.

[0019] The slag height measuring device 105 is installed above the converter 100 and measures the distance from the throat of the converter 100 to the surface of the slag 102 inside the converter 100. The slag height measuring device 105 may be, for example, a microwave distance meter. The microwave distance meter may convert the time it takes to emit a microwave and receive a reflected wave from the throat of the converter 100 and the surface of the slag 102 inside the converter 100 into a distance, and measure the distance from the throat of the converter 100 to the surface of the slag 102 inside the converter 100. The slag height may be measured at any time or continuously. A signal indicating the measurement result of the slag height measuring device 105 is sent to the control terminal 10.

[0020] In refining using a converter 100, the processes of "charging," "blowing," "tapping," and "slag removal" are performed in one charge. In the "charging" process, raw materials such as molten iron are charged into the converter 100. In the "blowing" process, auxiliary materials are added to the converter 100 and blown for the purpose of at least one of desiliconization, dephosphorization, and decarburization. In the "tapping" process, the molten metal 101 is tapped. In the "slag removal" process, some or all of the slag 102 is discharged outside the furnace by slag removal. In some cases, the next charge is performed without slag removal. Typically, multiple charges are performed in refining, and these processes are repeated. The slag 102 remaining in the nth charge in the converter 100 may be carried over to the (n+1)th charge. In this embodiment, it is described that at least a portion of the slag 102 in the nth charge is carried over to the (n+1)th charge. Here, when processes (steps) with the same name are executed again after a certain time has passed, the process executed earlier in time is sometimes marked with "previous" and the process executed later in time is sometimes marked with "next" to distinguish them. For example, the blowing process for the nth charge is sometimes referred to as the "previous blowing process," and the blowing process for the (n+1)th charge is sometimes referred to as the "later blowing process."

[0021] To explain some of the processes in more detail using the refining equipment shown in Figure 1, after the end of the blow, the lance 103 is retracted to the top of the converter 100. The converter 100 is then tilted to tap the molten metal 101 from the furnace, and then tilted again to discharge the slag 102 outside the furnace. After the slag removal process is completed, auxiliary materials are added as needed to protect the refractories in the furnace or to solidify the remaining molten metal 101, and then molten pig iron for the next blow is charged. The processing conditions (blow conditions), such as the amount of auxiliary materials to be charged from the furnace upper hopper 104, are determined based on the weight of the slag carried over from the previous charge, as well as the composition specifications of the molten pig iron and the post-processing slag. The in-furnace slag amount estimation device 1 estimates the weight of slag 102 carried over from the previous charge in the converter 100.

[0022] The blowing control system includes a control terminal 10, a display device 20, and an in-furnace slag amount estimation device 1 as its main components. The control terminal 10 may be configured with an information processing device such as a personal computer or a workstation. The control terminal 10 collects performance data on the blowing process and the slag removal process, and controls the process conditions so that the temperature and component concentrations of the molten metal 101 and the composition of the slag 102 fall within desired ranges. The display device 20 may be configured with, for example, a liquid crystal display (LCD) or a CRT (Cathode Ray Tube) display. The display device 20 may display the calculation results output from the in-furnace slag amount estimation device 1.

[0023] The in-furnace slag amount estimation device 1 is configured with an information processing device such as a personal computer or a workstation. The in-furnace slag amount estimation device 1 includes an input unit 11, a database 12, a slag bulk density calculation unit 13, a slag volume calculation unit 14, a slag weight calculation unit 15, and an output unit 16.

[0024] The input unit 11 is an input interface into which various data related to the refining equipment is input. The input unit 11 may be, for example, at least one of a keyboard, a mouse, a pointing device, a data receiving device, and a graphical user interface (GUI). The input unit 11 receives performance data, parameter settings, and the like from an external device, writes the information to the database 12, and transmits the information to the slag bulk density calculation unit 13 and the slag volume calculation unit 14. Input data is input to the input unit 11 from the control terminal 10. The input data includes furnace interior shape data indicating the shape of the interior of the converter 100. The furnace interior shape data may be measurement results or calculation results of the interior of the furnace. The input data includes data that are measurement results or calculation results regarding the composition and temperature of the molten metal 101 and the slag 102 before or during the blowing process. The data regarding the composition and temperature of the slag 102 are used as data regarding the composition and temperature of the slag 102 remaining in the converter 100 after the molten metal is tapped from the blowing process. The input data also includes slag height data, which is a measurement result of the slag height inside the converter 100 after tapping. The input unit 11 may also be capable of manual data input (manual input) by, for example, an operator of the refining equipment. Parameter setting values ​​of the model formula can be input manually.

[0025] The database 12 stores various measurement results and calculation results in the blowing process, models and parameters for calculating the amount of slag in the furnace, and estimated results of the amount of slag in the furnace. The database 12 is composed of a storage device such as a memory and a hard disk drive. The storage device may also store computer programs. Various information input to the input unit 11 and the estimated amount of slag in the furnace calculated by the slag weight calculation unit 15 are sent to the database 12. The models and parameters stored in the database 12 are used by the slag bulk density calculation unit 13 and the slag volume calculation unit 14.

[0026] The slag bulk density calculation unit 13, the slag volume calculation unit 14, and the slag weight calculation unit 15 are configured with a processor such as a CPU. The slag bulk density calculation unit 13, the slag volume calculation unit 14, and the slag weight calculation unit 15 may be realized by the processor reading and executing a computer program. Furthermore, the slag bulk density calculation unit 13, the slag volume calculation unit 14, and the slag weight calculation unit 15 may each have a dedicated processor or circuit.

[0027] The slag bulk density calculation unit 13 estimates the bulk density of the slag 102 in the furnace after tapping by calculation using the input data stored in the database 12 and the slag bulk density estimation model. The slag bulk density calculation unit 13 may calculate the bulk density of the slag 102 using data on the blowing process transmitted from the input unit 11 as input data. The slag bulk density calculation unit 13 transmits the calculated bulk density of the slag 102 after tapping to the slag weight calculation unit 15.

[0028] The slag volume calculation unit 14 calculates the volume of the slag 102 after pouring using the measurement results (slag height data) of the height of the slag 102 in the furnace after pouring, the furnace interior shape data, and the slag volume estimation model. The slag volume calculation unit 14 transmits the calculated volume of the slag 102 after pouring to the slag weight calculation unit 15.

[0029] The slag weight calculation unit 15 calculates the weight of the slag 102 in the furnace that will be carried over to the next blowing process, using the slag bulk density after tapping calculated by the slag bulk density calculation unit 13 and the slag volume after tapping calculated by the slag volume calculation unit 14. The slag weight calculation unit 15 transmits the calculated amount of slag in the furnace (the weight of the slag 102 remaining in the furnace after tapping) to the output unit 16.

[0030] The output unit 16 transmits the amount of slag in the furnace calculated by the slag weight calculation unit 15 to the control terminal 10 and the database 12. In the blowing process, various operation variables are determined and operating conditions are changed based on the calculation results output from the in-furnace slag amount estimation device 1. The output unit 16 also has a function of transmitting information calculated by the in-furnace slag amount estimation device 1 to the display device 20, making it possible to display the calculation results output from the in-furnace slag amount estimation device 1.

[0031] The in-furnace slag amount estimation device 1 having such a configuration executes the process of the in-furnace slag amount estimation method described below to accurately estimate the weight of slag 102 carried over to the next blowing process. Below, the operation of the in-furnace slag amount estimation device 1 when executing the in-furnace slag amount estimation method will be described with reference to the flowchart shown in Figure 2.

[0032] 2 is a flowchart showing the process of the method for estimating the amount of slag in a furnace according to one embodiment of the present disclosure. The flowchart shown in FIG. 2 starts when the blowing process is completed. Specifically, after the blowing process (previous blowing process) is completed and the molten metal is tapped and the slag is removed, the process for estimating the amount of slag in a furnace proceeds to step S1.

[0033] In the process of step S1, the height of the slag 102 in the converter 100 is measured. The measurement of the height of the slag 102 may be performed after the converter 100 is returned to an upright position to facilitate the volume calculation described below. The height of the slag 102 in the converter 100 may be obtained based on a single measurement value, but it is preferable to obtain a representative value of the height of the slag 102 over an arbitrary period by averaging multiple measurements that are temporally and spatially different. The measured height of the slag 102 in the converter 100 is sent to the input unit 11. This completes the process of step S1, and the process of estimating the amount of slag in the converter 100 proceeds to the process of step S2.

[0034] In step S2, the input unit 11 acquires performance data of the blowing process and the tapping and slag removal processes. More specifically, the input unit 11 acquires input data including furnace interior shape data of the converter 100, data on the composition and temperature of the molten metal 101 and slag 102, and slag height data within the converter 100. Step S2 can be referred to as an input step. Among the input data, the furnace interior shape data is generated prior to the execution of the previous blowing process. The furnace interior shape data may be generated, for example, based on measurements of the converter 100 prior to the "charging" step, i.e., before the raw materials are charged, and acquired from the control terminal 10 together with other data in step S2. The input unit 11 then transmits the performance data, parameter settings, and the like to the database 12, the slag bulk density calculation unit 13, and the slag volume calculation unit 14. This completes step S2, and the in-furnace slag volume estimation process proceeds to step S3.

[0035] In the process of step S3, the slag bulk density calculation unit 13 calculates the bulk density (D s Step S3 can be referred to as a slag bulk density calculation step. The slag bulk density estimation model can be, for example, a linear combination model as shown in the following equation (1).

[0036]

number

[0037] Here, i is a parameter that specifies the items of explanatory variables obtained from the results of the blowing process, tapping, and slag removal processes. i is an explanatory variable. A i are coefficients corresponding to the respective explanatory variables. The explanatory variables may include a calculated value of the weight of the slag 102 in the furnace at the end of blowing, a calculated value of the slag basicity (CaO concentration / SiO concentration), a calculated value of the iron concentration in the slag, a calculated value of the weight of iron flowing in the slag, etc.

[0038] The model for estimating the bulk density of slag after slag removal is not limited to the above linear combination model, and machine learning models, etc. can also be used.

[0039] Here, the machine learning model can be constructed based on past data stored in the database 12 before operation. The explanatory variables can be obtained from observable measured values, analytical values, calculated values ​​based on these, etc. Furthermore, the slag bulk density can be obtained from the calculation results of the volume of slag remaining in the furnace (described later) and the actual measured value of the amount of slag in the furnace.

[0040] The actual amount of slag in the furnace may be determined by the difference between the amount of slag in the furnace calculated based on the amount of auxiliary materials charged during blowing and the amount of slag discharged outside the furnace as measured by a weighing scale. Alternatively, the amount of slag in the furnace may be determined by back-calculating the weight of the discharged slag from the slag composition analysis values ​​after the blowing process and the amount of auxiliary materials charged during blowing.

[0041] As described above, in addition to linear regression models, various machine learning models can be constructed using actual values ​​of the objective variable and explanatory variables as training data. A highly accurate model based on any of these methods may be used.

[0042] The slag bulk density calculation unit 13 transmits the calculated bulk density of the slag 102 after tapping to the slag weight calculation unit 15. This completes the process of step S3, and the process of estimating the amount of slag in the furnace proceeds to the process of step S4.

[0043] In step S4, the slag volume calculation unit 14 calculates the volume of the slag 102 after tapping using the slag height data of the slag 102 in the furnace after tapping, the furnace interior shape data, and the slag volume estimation model. Step S4 can be referred to as a slag volume calculation step. In this embodiment, the volume of the slag 102 in the furnace after tapping is calculated using the slag volume estimation model and the height of the slag 102 in the furnace and the furnace interior shape data. The volume of the slag 102 in the furnace may be calculated by integrating the furnace volume from the furnace bottom to the height of the slag 102 based on the furnace interior shape data. Alternatively, a calculated value of the volume of the slag 102 in the furnace corresponding to the height from the furnace bottom may be stored in the database 12 in advance based on the furnace interior shape data, and the volume of the slag 102 in the furnace may be calculated by selecting the calculated value from the database 12 corresponding to the height of the slag 102. Furthermore, the furnace interior shape data preferably includes furnace body profile information measured by a laser rangefinder or the like. For example, the interior of the furnace before the start of the blowing process may be measured with a laser distance meter, and distance data from the center line of the furnace body may be acquired as distance data at predetermined intervals in the vertical direction and at predetermined angles around the center line. The acquired distance data may be stored in the database 12 as a point cloud in a polar coordinate system and used as furnace body profile information for calculating the furnace volume.

[0044] Furthermore, if the furnace body is tilted, the tilt angle may be included as an input, and the height of the slag 102 may be corrected based on the tilt angle before calculating the volume.

[0045] The slag volume estimation model is not limited to a specific formula, and for example, a known calculation formula, a machine learning model, etc. can be used.

[0046] The furnace interior shape data may be updated at appropriate times by new measurements to reflect changes in the shape, etc. The furnace interior shape data may also be corrected using the amount of wear within the furnace estimated based on the number of times the converter 100 has been used, etc. The slag volume calculation unit 14 transmits the calculated volume of the slag 102 after tapping to the slag weight calculation unit 15. This completes the process of step S4, and the process of estimating the amount of slag within the furnace proceeds to step S5.

[0047] In the processing of step S5, the slag weight calculation unit 15 calculates the weight of the slag 102 after tapping. The weight of the slag 102 after tapping is calculated by multiplying the estimated bulk density of the slag 102 after tapping calculated by the slag bulk density calculation unit 13 by the volume of the slag 102 after tapping calculated by the slag volume calculation unit 14. Step S5 can be referred to as a slag weight calculation step.

[0048] The output unit 16 transmits the weight of the slag 102 after tapping, calculated by the slag weight calculation unit 15, to the database 12. The output unit 16 also transmits the weight of the slag 102 after tapping to the control terminal 10. The control terminal 10 may determine the processing conditions for the next blowing process based on the obtained weight of the slag 102, the molten iron to be charged next, and the composition specifications after processing. The output unit 16 also transmits the weight of the slag 102 to be carried over to the next charge to the display device 20. The operator can change the processing conditions for the next blowing process depending on the weight of the slag 102 to be carried over to the next charge, which is displayed on the display device 20. This completes the processing of step S5, and the in-furnace slag amount estimation process.

[0049] Based on the weight of slag remaining inside the converter 100 estimated by the above-described method for estimating the amount of slag in the furnace, an optimal slag design for the next blowing process becomes possible. In other words, based on the estimated amount of slag in the furnace, the amount of auxiliary materials charged is determined so as to achieve an optimal basicity (CaO concentration / SiO2 concentration), and refining operations are carried out to produce good molten steel. In this way, a good molten steel production method can be realized based on the weight of slag in the furnace calculated by the above-described method for estimating the amount of slag in the furnace.

[0050] As described above, the in-furnace slag amount estimation device 1, in-furnace slag amount estimation method, and molten steel production method according to this embodiment can calculate the weight of the slag in the furnace after tapping using the calculated slag bulk density value after tapping and the in-furnace slag volume. The in-furnace slag volume is calculated from the measurement results of the slag height in the furnace after tapping. This makes it possible to eliminate factors that cause variation, such as changes in the shape of the converter 100 near the throat, and to accurately estimate the weight of the slag carried over to the next blowing process.

[0051] Although the embodiments of the present disclosure have been described based on the drawings and examples, it should be noted that those skilled in the art would easily be able to make various modifications or alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations are included within the scope of the present disclosure. For example, the functions included in each component or step can be rearranged so as not to cause logical inconsistencies, and multiple components or steps can be combined or divided into one. The embodiments of the present disclosure can also be realized as a program executed by a processor included in an apparatus or a storage medium on which a program is recorded. It should be understood that these are also included within the scope of the present disclosure. [Explanation of symbols]

[0052] 1. Furnace slag volume estimation device 10 Control Terminal 11 Input section 12 Databases 13 Slag bulk density calculation section 14 Slag volume calculation section 15 Slag weight calculation section 16 Output section 20 Display device 100 converter 101 Molten metal 102 Slag 103 Lance 104 Furnace hopper 105 Slag height measuring device

Claims

1. An in-furnace slag amount estimation device that estimates a weight of slag remaining in a converter when part or all of the slag remaining in the converter after tapping of a previous blowing process is carried over to a next blowing process in the converter, an input unit into which input data including furnace interior shape data indicating the shape of the furnace interior, data on the composition and temperature of the slag remaining in the furnace, and slag height data indicating the height of the slag remaining in the furnace is input; a slag bulk density calculation unit that calculates the bulk density of the slag remaining in the furnace using the input data and a slag bulk density estimation model; a slag volume calculation unit that calculates the volume of slag remaining in the furnace using the slag height data, the furnace interior shape data, and a slag volume estimation model; An apparatus for estimating the amount of slag in a furnace, comprising: a slag weight calculation unit that calculates the weight of the slag remaining in the furnace using the calculated bulk density of the slag and the calculated volume of the slag.

2. 2. The in-furnace slag amount estimation device according to claim 1, wherein the slag volume estimation model calculates an in-furnace volume from the hearth to a height of the slag remaining in the furnace based on the in-furnace shape data and the slag height data generated based on measurements of the converter before the previous blowing treatment was performed.

3. 3. The in-furnace slag amount estimation device according to claim 1, wherein the slag height data is measured by a microwave distance meter.

4. A method for estimating the amount of slag remaining in a converter, when part or all of the slag remaining in the converter after the tapping of a previous blowing process is carried over to a next blowing process in the converter, comprising: an input step in which input data including furnace interior shape data indicating the shape of the furnace interior, data on the composition and temperature of slag remaining in the furnace, and slag height data indicating the height of slag remaining in the furnace is input; a slag bulk density calculation step of calculating the bulk density of the slag remaining in the furnace using the input data and a slag bulk density estimation model; a slag volume calculation step of calculating the volume of slag remaining in the furnace using the slag height data, the furnace interior shape data, and a slag volume estimation model; A method for estimating the amount of slag in a furnace, comprising: a slag weight calculation step of calculating the weight of the slag remaining in the furnace using the calculated bulk density of the slag and the calculated volume of the slag.

5. 5. The method for estimating the amount of slag in a furnace according to claim 4, wherein the slag volume estimation model calculates the in-furnace volume from the hearth to a height of the slag remaining in the furnace based on the in-furnace shape data and the slag height data generated based on measurements of the converter before the previous blowing treatment was performed.

6. The method for estimating the amount of slag in a furnace according to claim 4, wherein the slag height data is measured by a microwave distance meter.

7. 7. A method for producing molten steel, comprising: determining an amount of auxiliary materials to be charged in the next blowing treatment based on the weight of slag remaining in the furnace calculated by the method for estimating the amount of slag in the furnace according to any one of claims 4 to 6; and performing refining operation to produce molten steel.

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