A method for calculating the slag-iron liquid level in the blast furnace hearth

Abstract

The present invention provides a method for calculating the slag and iron level in a blast furnace hearth, relating to the field of blast furnace smelting technology, comprising the following steps: S1, collecting data; collecting production data and process parameter data of a target blast furnace and inputting them into a database; S2, calculating instantaneous slag and iron production; calculating the residence time of the charge in the blast furnace based on the production data and process parameter data of the target blast furnace; calculating the instantaneous slag production and instantaneous iron production based on the production data and process parameter data of the target blast furnace and the residence time of the charge in the blast furnace; S3, judging whether initialization has occurred; S4, calculating the slag content and iron content in the hearth; S5, calculating the slag and iron level heights in the hearth. The present invention can more accurately determine the slag and iron interface height information in the blast furnace hearth by collecting blast furnace operating parameter data, providing a basis for on-site operators to judge the hearth state and grasp the timing of slag and iron tapping, and has strong practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace smelting, and in particular to a method for calculating the slag and iron liquid level in a blast furnace hearth. Background Art

[0002] During blast furnace operation, the hearth is a critical component affecting its service life. When hearth abnormalities reach a certain level, the health of the blast furnace is jeopardized. High-quality molten iron cannot be produced in this situation, impacting both production output and the safety of workers. Currently, data available on-site to reflect hearth health is very limited, consisting of only thermocouple temperature, cooling system water flow, water temperature differential, and slag-iron temperature. However, this data is incomplete, particularly lacking the slag-iron level in the hearth, a fundamental indicator of hearth health. Therefore, additional data is urgently needed to accurately assess hearth health.

[0003] However, due to the high temperature of the blast furnace, the slag iron liquid level in the cylinder cannot be directly obtained by observation. At present, on-site operators generally estimate the slag iron liquid level in the furnace cylinder based on their own experience to operate the blast furnace. At the same time, some researchers at home and abroad have also studied predicting the slag iron liquid level by installing some sensors outside the furnace cylinder. However, due to the erosion of the furnace lining by the slag iron, the operating furnace type is constantly changing, and the measured slag iron liquid level results often have large errors and have not been put into practical application. Therefore, the present invention develops a method for calculating the slag iron liquid level in the blast furnace hearth to solve this problem. Summary of the Invention

[0004] In response to the aforementioned technical problem of the difficulty in calculating the slag level in the existing furnace hearth, a method for calculating the slag level in the blast furnace hearth is provided. The present invention primarily utilizes real-time production data and process parameter data from the target blast furnace site to calculate the slag level in the hearth through a simple algorithm, thereby assisting in determining the state of the slag in the hearth.

[0005] The technical means adopted in the present invention are as follows:

[0006] A method for calculating the slag and iron level in a blast furnace hearth comprises the following steps:

[0007] S1. Collect data;

[0008] Collect the production data and process parameter data of the target blast furnace and input them into the database;

[0009] S2. Calculate the instantaneous slag and iron production;

[0010] Calculate the residence time of the charge in the blast furnace based on the production data and process parameter data of the target blast furnace;

[0011] Calculating the instantaneous slag production and the instantaneous iron production based on the production data and process parameter data of the target blast furnace and the residence time of the charge in the blast furnace;

[0012] S3, determine whether to initialize;

[0013] The number of tappings is divided into the number of tappings, which is represented by the symbol n, where n is an integer, such as 0, 1, 2, etc. When the algorithm is run for the first time, n is set to 0, and the time is recorded from the end of the tapping, represented by "t", with the initial time t=0s; the end time of the first tapping 0 is set to Tn=t=0s; the initialization judgment rule is used to determine whether to perform initialization and obtain the remaining molten iron and slag at the end of the previous tapping;

[0014] S4. Calculate the slag content and iron content in the furnace according to the instantaneous slag production and instantaneous iron production obtained in S2 and the remaining molten iron and remaining slag obtained in S3;

[0015] S5. Calculate the slag level and iron level in the furnace hearth based on the slag content and iron content in the furnace hearth obtained in S4 and the production data and process parameter data of the target blast furnace collected in S1.

[0016] Furthermore, the production data and process parameter data of the target blast furnace include the working volume of the blast furnace, the consumption of iron-containing raw materials, the composition of iron-containing raw materials, the daily iron production of the blast furnace, the density of raw materials and fuel, the slag-iron ratio and the molten iron tank, the amount of molten iron in the slag tank, the amount of slag, the density of raw materials and fuel and slag-iron, the compression rate of the charge in the blast furnace, the porosity and the size of the furnace shell.

[0017] Furthermore, in S2, the calculation formula for the residence time of the charge in the blast furnace is:

[0018]

[0019] Where: T is the residence time of charge in the blast furnace; V is the working volume of the blast furnace; P is the target daily iron production of the blast furnace; ρ i is the density of the i-th raw fuel; M i is the mass of raw materials consumed per ton of iron produced; i is different raw materials, i is 1, 2, 3, ...; c is the compression rate of the charge inside the blast furnace, which is a constant between 0.10 and 0.15;

[0020] In S2, the calculation formulas for instantaneous slag generation and instantaneous iron generation are:

[0021]

[0022] M slag =λM Fe ×10 -3

[0023] Where: M Fe is the instantaneous iron production of the blast furnace at the current moment, M slag is the instantaneous slag generation amount of the blast furnace at the current moment; g j w is the usage of the jth type of iron-containing raw material in the time period T closest to the current moment; Fe-j is the iron content of the jth iron-containing raw material in the time period T closest to the current moment; j is different iron-containing raw materials, which are 1, 2, 3, ... respectively; λ is the recent slag-iron ratio of the target blast furnace.

[0024] Furthermore, in S3, the initialization judgment rule is:

[0025] When n=0, it indicates that the algorithm needs to initialize the data when it is first run, and the slag iron discharge end time of this iron run is T0=t=0s, and the blast furnace hearth of this iron run is required to be drained of slag iron as much as possible, that is, the amount of molten iron remaining above the lower edge of the iron mouth in the blast furnace hearth at the end of this iron run is Q Fe-N and slag quantity Q slag-N is 0;

[0026] When n≥1, the algorithm does not need to be initialized and can read the last Q Fe-N-1 With Q slag-N-1 and T n-1 And enter S4 or directly perform initialization operations according to needs.

[0027] Furthermore, the calculation formula for calculating the slag content and iron content in the furnace hearth in S4 is:

[0028] Q Fe-t =Q Fe-n-1 +M Fe (tT n-1 )-W out-Fe-n

[0029] Q slag-t =Q slag-n-1 +M slag (tT n-1 )-W out-slag-n

[0030] Where: n is the blast furnace iron number; t is the current time; Q Fe-t is the amount of molten iron in the blast furnace hearth at time t; Q slag-t is the amount of slag in the blast furnace hearth at time t; Q Fe-N-1 Q is the amount of molten iron remaining in the blast furnace hearth at the end of the previous iron run n-1; slag-N-1 T is the amount of slag remaining in the blast furnace hearth at the end of the previous iron run n-1; n-1 The time when the last iron cycle n-1 ended; W out-Fe-nW is the molten iron discharged into the molten iron tank at time t during the discharge process of iron grade n slag; out-Fe-n It is the amount of slag discharged into the slag pot at time t during the discharge process of iron slag of grade n.

[0031] Furthermore, in S5, the calculation formulas for the liquid level in the furnace and the iron level are as follows:

[0032]

[0033]

[0034] Where: h Fe-t h is the height of the molten iron level in the blast furnace hearth at time t; slag-t h is the height of the slag liquid level in the blast furnace hearth at time t; o is the height of the lower edge of the iron mouth in the blast furnace hearth; ρ Fe is the density of molten iron; ρ slag is the slag density; r is the radius of the furnace hearth; ε is the porosity of the material column in the furnace hearth, which is a constant that can be investigated during the overhaul of the target blast furnace or estimated by the blast furnace operator based on experience and is a constant between 0.3 and 0.6.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] The present invention establishes a new method that can use blast furnace production data and process parameters to relatively accurately calculate the slag and iron liquid level height in the blast furnace through simple calculation, so as to assist on-site operators to timely tap slag and iron and judge the furnace condition. The method is simple, efficient, practical, and suitable for high-titanium blast furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0038] Figure 1 This is a calculation flow chart of the present invention.

[0039] Figure 2 Schematic diagram of the calculation results of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0044] like Figure 1 As shown, the present invention provides a method for calculating the slag and iron liquid level in a blast furnace hearth, comprising the following steps:

[0045] S1. Collect data;

[0046] The production data and process parameter data of the target blast furnace are collected, including the blast furnace working volume (the actual working volume from the material line inside the blast furnace to the center line of the tuyere), the consumption of iron-containing raw materials, the composition of iron-containing raw materials, the daily iron production of the blast furnace, the density of raw materials and fuel, the slag-iron ratio and the molten iron tank, the amount of molten iron in the slag tank, the amount of slag and other process parameters of the blast furnace, and input them into the database for subsequent calculations.

[0047] S2. Calculate the instantaneous slag and iron production;

[0048] Using the data collected in step 1, in order to calculate the instantaneous slag and iron production of the current target blast furnace, we must first calculate the residence time T of the charge in the blast furnace. The specific formula is as follows:

[0049]

[0050] Where: T is the residence time of charge in the blast furnace, h; V is the working volume of the blast furnace (the actual working volume from the charge line to the center line of the tuyere inside the blast furnace), m 3 ; P is the target daily iron production of the blast furnace, t; ρ i 、m i are the density of the i-th raw fuel (m 3 / kg) and the mass consumed per ton of iron produced (kg), where i represents different raw materials and is 1, 2, 3, ...; c is the compression rate of the charge inside the blast furnace, which is a constant, generally 0.10-0.15, and the specific selection needs to be based on the blast furnace smelting conditions.

[0051] Then, calculate the instantaneous slag and iron production M of the target blast furnace at the current moment Fe and M slag , the specific formula is as follows:

[0052]

[0053] M slag =λM Fe ×10 -3 (3)

[0054] Where: M Fe and M slag is the instantaneous slag and iron production of the blast furnace at the current moment, kg / s; g j 、w Fe-j is the usage (t) of the jth iron-containing raw material fed into the furnace and the iron content (%) of the raw material in the time period T closest to the current moment, where j represents different iron-containing raw materials and is 1, 2, 3, ... respectively; λ is the recent slag-iron ratio of the target blast furnace, kg / t.

[0055] S3, determine whether to initialize;

[0056] The time of iron mouth blocking after each blast furnace slag discharge is used as a node to divide the number of iron discharges, which is represented by the symbol n, where n is an integer, and can be 0, 1, 2, ... When the algorithm is run for the first time, let n = 0, and start recording the time from the end of the iron discharge, represented by "t", in seconds, with the initial time t = 0s. Let the end time of the first iron discharge 0 be T n =t=0s.

[0057] Determine whether to initialize based on the following rules:

[0058] (1) When n = 0, it indicates that the algorithm needs to initialize the data when it is first run, and the slag iron discharge end time of this iron run is T0 = t = 0s, and the blast furnace hearth of this iron run is required to be drained of slag iron as much as possible, that is, the amount of molten iron remaining above the lower edge of the iron mouth in the blast furnace hearth at the end of this iron run is Q Fe-N and slag quantity Q slag-N is 0.

[0059] (2) When n≥1, the algorithm does not need to be initialized and can read the last Q Fe-N-1 With Q slag-N-1 and T n-1 And enter the next step or the blast furnace operator can directly perform initialization operations according to needs.

[0060] S4. Calculate the amount of slag and iron in the furnace;

[0061] The method for calculating the amount of slag and iron in the furnace at the time t of the blast furnace iron grade n is as follows, where the time t satisfies T n-1 ≤t≤T n .

[0062] Q Fe-t =Q Fe-n-1 +M Fe (tT n-1 )-W out-Fe-n (5)

[0063] Q slag-t =Q slag-n-1 +M slag (tT n-1 )-W out-slag-n (6)

[0064] Where: t represents the current time, s; Q Fe-t and Q slag-t is the amount of molten iron and slag in the blast furnace hearth at time t, kg; g j , Q Fe-N-1 With Q slag-N-1 is the amount of molten iron and slag remaining in the blast furnace hearth at the end of the previous iron run n-1, kg; T n-1 The time when the last iron cycle n-1 ended, the minimum unit is s; W out-Fe-n With W out-Fe-n are the amounts of molten iron and slag discharged into the molten iron tank and slag tank at time t during the discharge process of iron grade n, kg.

[0065] S5. Calculate the slag and iron level in the furnace;

[0066] According to the data collected and calculated in steps 1 to 3, the slag and iron liquid level in the furnace at time t is calculated. The specific calculation formula is as follows:

[0067]

[0068]

[0069] Where: h Fe-t and h slag-t is the height of the molten iron level and slag level in the blast furnace hearth at time t, m; h o is the height of the lower edge of the iron mouth in the blast furnace hearth, m; ρ Fe , ρ slag are the densities of molten iron and slag, m3 / kg respectively; r is the radius of the furnace hearth, m; ε is the porosity of the material column in the furnace hearth, which is a constant and can be investigated during the overhaul of the target blast furnace or estimated by the blast furnace operator based on experience. The general value range is 0.3-0.6.

[0070] S6, output to database and visualize;

[0071] The data on time, iron times, instantaneous slag and iron generation, iron content in the furnace, slag content, molten iron level, and slag level are saved to the database and a real-time slag and iron level position diagram in the furnace is drawn to achieve visualization.

[0072] Example

[0073] Taking the actual production data of a steel company's blast furnace as an example, the present invention is further described in detail: Figure 2 Where A is the slag level in the furnace; B is the molten iron level in the furnace; C is the height h0 of the lower edge of the iron mouth in the furnace.

[0074] Step 1: Collect data

[0075] The production data and process parameter data of the target blast furnace are collected, including the blast furnace working volume (the actual working volume from the internal material line to the tuyere centerline of the blast furnace), iron-containing raw material consumption, iron-containing raw material composition, blast furnace daily iron production, raw material and fuel density, slag-iron ratio and molten iron tank, molten iron volume in the slag tank, slag volume and other blast furnace process parameters, and are input into the database for subsequent calculations. The specific data are shown in Table 1.

[0076] Table 1 Model input data

[0077]

[0078]

[0079] Step 2: Calculate the instantaneous slag and iron production

[0080] Using the data collected in step 1, in order to calculate the instantaneous slag and iron production of the current target blast furnace, we must first calculate the residence time T of the charge in the blast furnace. The specific formula is as follows:

[0081]

[0082] Where: T is the residence time of charge in the blast furnace, h; V is the working volume of the blast furnace (the actual working volume from the charge line to the center line of the tuyere inside the blast furnace), m 3 ; P is the target daily iron production of the blast furnace, t; ρ i 、m i are the density of the i-th raw fuel (m 3 / kg) and the mass consumed per ton of iron produced (kg), where i represents different raw materials and is 1, 2, 3, ...; c is the compression rate of the charge inside the blast furnace, which is a constant and is taken as 0.13 according to the target blast furnace smelting conditions.

[0083] Substituting the data in Table 1, we can calculate T≈3.8h.

[0084] Then, calculate the instantaneous slag and iron production M of the target blast furnace at the current moment Fe and M slag , the specific formula is as follows:

[0085]

[0086] M slag =λM Fe ×10 -3 (3)

[0087] Where: M Fe and M slag is the instantaneous slag and iron production of the blast furnace at the current moment, kg / s; g j 、w Fe-j is the usage (t) of the jth iron-containing raw material fed into the furnace within the last 3.8 hours from the current moment and the iron content (%) of the raw material, where j represents different iron-containing raw materials, and is 1, 2, 3, ... respectively; λ is the recent slag-iron ratio of the target blast furnace, kg / t.

[0088] Substitute the data in Table 1 and calculate M Fe ≈37.47kg / s, M slag ≈23.60kg / s.

[0089] Step 3: Determine whether to initialize

[0090] The time of iron mouth blocking after each blast furnace slag discharge is used as a node to divide the number of iron discharges, which is represented by the symbol n, where n is an integer, and can be 0, 1, 2, ... When the algorithm is run for the first time, let n = 0, and start recording the time from the end of the iron discharge, represented by "t", in seconds, with the initial time t = 0s. Let the end time of the first iron discharge 0 be T n =t=0s.

[0091] Determine whether to initialize based on the following rules:

[0092] (1) When n = 0, it indicates that the algorithm needs to initialize the data when it is first run, and the slag iron discharge end time of this iron run is T0 = t = 0s, and the blast furnace hearth of this iron run is required to be drained of slag iron as much as possible, that is, the amount of molten iron remaining above the lower edge of the iron mouth in the blast furnace hearth at the end of this iron run is Q Fe-N and slag quantity Q slag-N is 0.

[0093] (2) When n≥1, the algorithm does not need to be initialized and can read the last Q Fe-N-1 With Q slag-N-1 and T n-1 And enter the next step or the blast furnace operator can directly perform initialization operations according to needs.

[0094] According to the above rules, since this is the second time the algorithm is run, that is, n = 1, the second condition is met, and the last data is read, T0 = 0s, Q Fe-0 =0,Q slag-0 =0

[0095] Step 4: Calculate the amount of slag and iron in the furnace

[0096] At the current time t = 900s, the blast furnace iron number n = 1, the slag iron amount in the furnace is as follows, where the time t satisfies T0≤t≤T n .

[0097] Q Fe-t =Q Fe-n-1 +M Fe (tT n-1 )-W out-Fe-n (5)

[0098] Q slag-t =Q slag-n-1 +M slag (tT n-1 )-W out-slag-n (6)

[0099] Where: t represents the current time, s; Q Fe-t and Q slag-t is the amount of molten iron and slag in the blast furnace hearth at time t, kg; g j , Q Fe-N-1 With Q slag-N-1 is the amount of molten iron and slag remaining in the blast furnace hearth at the end of the previous iron run n-1, kg; T n-1 The time when the last iron cycle n-1 ended, the minimum unit is s; W out-Fe-n With W out-Fe-nare the amounts of molten iron and slag discharged into the molten iron tank and slag tank at time t during the discharge process of iron grade n, kg.

[0100] Substituting the data in Table 1, we can get t = 900s, Q Fe-t =11239.51kg, Q slag-t =7080.894kg.

[0101] Step 5: Calculate the slag and iron level in the furnace

[0102] According to the data collected and calculated in steps 1 to 3, the slag and iron liquid level in the furnace at time t = 900s is calculated. The specific calculation formula is as follows:

[0103]

[0104]

[0105] Where: h Fe-t and h slag-t is the height of the molten iron layer and slag layer in the blast furnace hearth at time t, m; h o is the height of the lower edge of the iron mouth in the blast furnace hearth, m; ρ Fe , ρ slag are the densities of molten iron and slag, m 3 / kg; r is the radius of the furnace hearth, m; ε is the porosity of the material column in the furnace hearth, which is a constant. It can be investigated during the overhaul of the target blast furnace or estimated by the blast furnace operator based on experience. The general value range is 0.3-0.6.

[0106] Substituting the data in Table 1, we can get the iron layer elevation h when n = 1 and time t = 900s. Fe-t =9.22m, slag layer elevation h slag-t =9.56m.

[0107] Step 6: Output to database and visualize

[0108] The data of time, iron times, instantaneous slag iron generation, iron amount in furnace, slag amount, molten iron level, slag level are saved in the database and a real-time slag iron level position diagram is drawn in furnace to achieve visualization, such as Figure 2 As shown, the accumulation height of molten iron and slag inside the blast furnace can be seen intuitively, which is convenient for judging the timing of slag and iron tapping.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the slag and iron level in a blast furnace hearth, characterized in that: The steps include: S1. Collect data; Collect the production data and process parameter data of the target blast furnace and input them into the database; S2. Calculate the instantaneous slag and iron production; Calculate the residence time of the charge in the blast furnace based on the production data and process parameter data of the target blast furnace; In S2, the calculation formula for the residence time of the charge in the blast furnace is: Where: T is the residence time of charge in the blast furnace; V is the working volume of the blast furnace; P is the target daily iron production of the blast furnace; ρ i is the density of the i-th raw fuel; m i is the mass of raw materials consumed per ton of iron produced; i is different raw materials, i is 1, 2, 3, ...; c is the compression rate of the charge inside the blast furnace, which is a constant between 0.10 and 0.15; Calculating the instantaneous slag production and the instantaneous iron production based on the production data and process parameter data of the target blast furnace and the residence time of the charge in the blast furnace; In S2, the calculation formulas for instantaneous slag generation and instantaneous iron generation are: Where: M Fe is the instantaneous iron production of the blast furnace at the current moment, M slag is the instantaneous slag generation amount of the blast furnace at the current moment; g j w is the usage of the jth type of iron-containing raw material in the time period T closest to the current moment; Fe-j is the iron content of the jth iron-containing raw material in the nearest T time period from the current moment; j represents different iron-containing raw materials, and is 1, 2, 3, ... respectively; λ is the recent slag-iron ratio of the target blast furnace; S3, determine whether to initialize; The tapping times are divided into the number of tapping times, which is represented by the symbol n, where n is an integer, such as 0, 1, 2, etc. When the algorithm is run for the first time, let n = 0, and start recording the time from the end of the tapping time, represented by "t", with the initial time t = 0s; let the end time of the first tapping time 0 be T n = t = 0s; determine whether to perform initialization according to the initialization judgment rule and obtain the remaining molten iron and remaining slag at the end of the previous iron run; The initialization judgment rules are: When n=0, it indicates that the algorithm needs to initialize the data when it is first run. The slag iron discharge end time of this iron run is T0=t=0s, and the blast furnace hearth of this iron run is required to be drained of slag iron as much as possible, that is, the amount of molten iron remaining above the lower edge of the iron mouth in the blast furnace hearth at the end of this iron run is Q Fe-n and slag quantity Q slag-n is 0; When n≥1, the algorithm does not need to be initialized and can read the last Q Fe-n-1 With Q slag-n-1 and T n-1 And enter S4 or directly perform initialization operations according to needs; S4. Calculate the slag content and iron content in the furnace according to the instantaneous slag production and instantaneous iron production obtained in S2 and the remaining molten iron and remaining slag obtained in S3; S5. Calculate the slag level and iron level in the furnace hearth based on the slag content and iron content in the furnace hearth obtained in S4 and the production data and process parameter data of the target blast furnace collected in S1.

2. The method for calculating the slag and iron level in the blast furnace hearth according to claim 1, wherein: The production data and process parameter data of the target blast furnace include the working volume of the blast furnace, the consumption of iron-containing raw materials, the composition of iron-containing raw materials, the daily iron production of the blast furnace, the density of raw materials and fuel, the slag-iron ratio and the molten iron tank, the amount of molten iron in the slag tank, the amount of slag, the density of raw materials and fuel and slag-iron, the compression rate of the charge in the blast furnace, the porosity and the size of the furnace hearth.

3. The method for calculating the slag and iron level in the blast furnace hearth according to claim 1, wherein: The calculation formula for calculating the slag content and iron content in the furnace hearth in S4 is: Where: n is the blast furnace iron number; t is the current time; Q Fe-t is the amount of molten iron in the blast furnace hearth at time t; Q slag-t is the amount of slag in the blast furnace hearth at time t; Q Fe-n-1 Q is the amount of molten iron remaining in the blast furnace hearth at the end of the previous iron run n-1; slag-n-1 T is the amount of slag remaining in the blast furnace hearth at the end of the previous iron run n-1; n-1 The time when the last iron cycle n-1 ended; W out-Fe-n W is the molten iron discharged into the molten iron tank at time t during the discharge process of iron grade n slag; out-slag-n It is the amount of slag discharged into the slag pot at time t during the discharge process of iron slag of grade n.

4. The method for calculating the slag and iron level in a blast furnace hearth according to claim 1, wherein: In S5, the calculation formulas for the slag level and iron level in the furnace are: Where: h Fe-t h is the height of the molten iron level in the blast furnace hearth at time t; slag-t h is the height of the slag liquid level in the blast furnace hearth at time t; o is the height of the lower edge of the iron mouth in the blast furnace hearth; ρ Fe is the density of molten iron; ρ slag is the slag density; r is the radius of the furnace hearth; ε is the porosity of the material column in the furnace hearth, which is a constant that can be investigated during the overhaul of the target blast furnace or estimated by the blast furnace operator based on experience and is a constant between 0.3 and 0.6.

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