Blast furnace slag iron accumulation amount calculation and stokehole field reversing method

Abstract

The invention relates to the technical field of blast furnace ironmaking, and particularly discloses a blast furnace slag iron accumulation amount calculation and stokehole field transfer method, which comprises the following steps: firstly, calculating slag iron generation amount through ore and fuel composition and proportion, performing stokehole real-time measurement on slag iron discharge amount, and enabling the in-furnace slag iron accumulation amount to be equal to the difference between the slag iron generation amount and the slag iron discharge amount; the tapping sequence of the blast furnace adopts iron notch clockwise overlapping tapping, when the iron slag accumulation amount is larger than 10 tons, the next iron notch is opened in advance, a drill bit with the diameter of 62 mm is used, the two iron notch overlapping tapping time is prolonged, and when the iron slag accumulation amount is smaller than-5 tons, a drill bit with the diameter of 55 mm is used for the next iron notch, and the tapping speed is reduced; the iron notch is overhauled in turn along the diagonal line, the iron notch steeping mud is replaced in sections after being overhauled, and the mud ramming amount of each section is determined by the depth of the previous iron notch; the blast furnace can be effectively promoted to completely discharge slag iron, and stable and smooth operation of the blast furnace is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking technology, specifically to a method for calculating the amount of blast furnace slag and iron accumulation and for clearing it from the furnace front. Background Technology

[0002] Blast furnace ironmaking is one of the core processes in the modern steel industry, and the tapping procedure is a crucial aspect of blast furnace operation. Excessive slag and iron accumulation in the furnace leads to high pressure and insufficient blast air intake. Conversely, insufficient slag and iron content results in excessive heat dissipation from the hearth, causing the furnace to cool down. Accurately assessing the slag and iron accumulation and optimizing blast furnace tapping are key tasks for blast furnace operators today.

[0003] Regarding the calculation of slag and iron accumulation, Chinese patent CN 112899424 A, "A Method for Iron Tapping in a Large Blast Furnace," mentions the theoretical generation rate as: number of charging batches × batch iron quantity ÷ time. However, it does not specify the calculation method for the batch iron quantity and does not mention the calculation of slag quantity in the furnace. For blast furnace tapping, Chinese patent CN 110512041A, "A Method for Repairing the Taphole Depth of a Blast Furnace Tapping Point," mentions repeatedly plugging and mud-cleaning a specific taphole until the taphole depth reaches a preset value. However, the mud-cleaning amount cannot be adjusted according to the taphole depth. Therefore, it is necessary to design a method for calculating blast furnace slag and iron accumulation and for tapping in the furnace to address the problems in existing blast furnace ironmaking processes, such as unclear calculation methods for slag and iron accumulation, unreasonable tapping sequence, and poor operability of repairing the new taphole depth. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a method for calculating the amount of blast furnace slag and iron accumulation and for clearing it from the furnace front.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for calculating the amount of blast furnace slag and iron accumulation and for clearing it from the furnace front, comprising the following steps:

[0006] S1. Calculate the amount of slag and iron produced by analyzing the composition and ratio of ore and fuel.

[0007] S2. The amount of slag and iron discharged is measured in real time at the furnace front. The amount of slag and iron accumulated in the furnace is equal to the amount of slag and iron generated minus the amount of slag and iron discharged.

[0008] S3. The blast furnace tapping sequence adopts clockwise overlapping tapping from the tapholes. When the slag and iron accumulation is >10 tons, the next taphole is opened in advance, and a 62mm diameter drill bit is used to increase the overlapping tapping time of the two tapholes. When the slag and iron accumulation is <-5 tons, a 55mm diameter drill bit is used at the next taphole to reduce the tapping speed.

[0009] S4. The maintenance sequence of the taphole is clockwise and diagonally alternating. After maintenance, the taphole is replaced with mud in sections, and the amount of mud removed from each section is determined by the depth of the previous taphole section.

[0010] Specifically, the types of ore in step S1 include sinter, pellets, and lump ore, and the content indicators of the ore include TFe, CaO, SiO2, MgO, and Al2O3 in sinter; TFe, CaO, SiO2, MgO, and Al2O3 in pellets; and TFe, CaO, SiO2, MgO, and Al2O3 in lump ore.

[0011] The types of fuels include coke and pulverized coal. The content indicators of the fuels include TFe, CaO, SiO2, MgO, and Al2O3 in coke and TFe, CaO, SiO2, MgO, and Al2O3 in pulverized coal.

[0012] Specifically, the calculation of the amount of slag and iron generated in step S1 is as follows:

[0013] S11, Sintered ore ratio X1 + Pelletized ore ratio X2 + Lump ore ratio X3 = 100;

[0014] S12, Batch iron content F = (Sintered ore TFe content A1 × Sintered ore ratio X1 + Pelletized ore TFe content A2 × Pelletized ore ratio X2 + Lump ore TFe content A3 × Lump ore ratio X3) × Batch size K ÷ 10000;

[0015] S13, Coke batch J = Coke ratio X4 × Iron content of batch F ÷ 1000;

[0016] S14, Slag quantity S1 = (Sinter CaO content B1 × Sinter proportion X1 + Pellet CaO content B2 × Pellet proportion X2 + Lump ore CaO content B3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke CaO content B4 × Coke batch J ÷ 100 + Pulverized coal CaO content B5 × Hourly coal quantity M ÷ Hourly material batches H ÷ 100;

[0017] S15, Slag quantity S2 = (Sintered ore SiO2 content C1 × Sintered ore proportion X1 + Pelletized ore SiO2 content C2 × Pelletized ore proportion X2 + Lump ore SiO2 content C3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke SiO2 content C4 × Coke batch J ÷ 100 + Pulverized coal SiO2 content C5 × Hourly coal quantity M ÷ Hourly batch number H ÷ 100 - 60 ÷ 28 × Hot iron Si content × Batch iron quantity F ÷ 100;

[0018] S16, Slag quantity S3 = (MgO content of sintered ore D1 × sintered ore proportion X1 + MgO content of pellets D2 × pellets proportion X2 + MgO content of lump ore D3 × lump ore proportion X3) × ore batch K ÷ 10000 + MgO content of coke D4 × coke batch J ÷ 100 + MgO content of pulverized coal D5 × hourly coal quantity M ÷ hourly material batch number H ÷ 100;

[0019] S17, Slag quantity S4 = (Sintered ore Al2O3 content E1 × Sintered ore proportion X1 + Pelletized ore Al2O3 content E2 × Pelletized ore proportion X2 + Lump ore Al2O3 content E3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke Al2O3 content E4 × Coke batch J ÷ 100 + Pulverized coal Al2O3 content E5 × Hourly coal quantity M ÷ Hourly material batch number H ÷ 100;

[0020] S18, Total slag amount of batch material S = Slag amount S1 + Slag amount S2 + Slag amount S3 + Slag amount S4;

[0021] S19, Slag and iron production = Iron production in batch F + Total slag production in batch S.

[0022] Specifically, in step S3, the blast furnace tapping sequence adopts a clockwise continuous cyclic tapping mode. During normal production, the tapping sequence is: tapping from tapping point 1 → tapping point 2 → tapping point 3 → tapping point 4 → tapping point 1... cyclic tapping; the tapping time is 120±5 minutes. After tapping for 110 minutes, the next tapping point is opened in advance, and the overlap time between the two tapping points is 5-15 minutes; during normal production, a drill bit with a diameter of 58 mm is used.

[0023] Specifically, the maintenance sequence of the taps in step S4 is clockwise diagonal rotation, with the diagonal rotation sequence being tap 1 → tap 3 → tap 2 → tap 4 → tap 1... and so on.

[0024] Specifically, the maintenance sequence for the tapholes is a clockwise diagonal rotation applicable to 4000m. 3 For the above-mentioned large blast furnaces, the number of blast furnace tapholes is ≥4.

[0025] Specifically, the step of replacing the sludge in the taphole after maintenance in step S4 is as follows:

[0026] S41. Replacement time: For the first replacement, open the tap 4-5 hours before the tap is put into the system and close the tap within 2 minutes after opening; for the second replacement, open the tap 3-4 hours before the tap is put into the system and close the tap within 2 minutes after opening; for the third replacement, open the tap 2.5-3 hours before the tap is put into the system and close the tap within 2 minutes after opening; for the fourth replacement, open the tap 2-2.5 hours before the tap is put into the system and close the tap within 2 minutes after opening.

[0027] S42. Amount of mud removed: Amount of mud removed during the first replacement, L÷L1×I×1.1; Amount of mud removed during the second replacement, L÷L2×I×1.05; Amount of mud removed during the third replacement, L÷L3×I×1.05; Amount of mud removed during the fourth replacement, L÷L4×I.

[0028] Where L is the taphole depth during normal production, in meters; L1 is the taphole depth during the first replacement, in meters; L2 is the taphole depth during the second replacement, in meters; L3 is the taphole depth during the third replacement, in meters; L4 is the taphole depth during the fourth replacement, in meters; and I is the amount of mud removed during normal production, in kilograms.

[0029] The present invention has the following beneficial effects:

[0030] The present invention designs a method for calculating the slag and iron accumulation in blast furnaces and for clearing the furnace front. This method determines the taphole opening time and drill bit size by calculating the slag and iron accumulation. By adopting continuous circulating tapping, it ensures uniform iron circulation in the hearth. The newly added taphole is replaced in stages, and the amount of taphole clay replaced is determined by the taphole depth during replacement, ensuring the smooth commissioning of the new taphole. This effectively promotes the complete removal of slag and iron from the blast furnace and ensures the stable and smooth operation of the blast furnace. Attached Figure Description

[0031] Figure 1 This is a schematic diagram showing the structure of the blast furnace taphole.

[0032] Figure 2 This is a schematic diagram showing the clockwise diagonal rotation sequence for the maintenance of iron taps.

[0033] Figure 3 This is a schematic diagram of the iron tapping state at the blast furnace tapping spout. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] like Figures 1-3 As shown, a method for calculating the accumulated blast furnace slag and iron and for clearing it from the furnace front includes the following steps:

[0036] 1. Calculate the amount of slag and iron produced based on the composition and ratio of ore and fuel; the composition and ratio of ore and fuel are shown in Table 1:

[0037] Table 1

[0038]

[0039]

[0040] The calculation of slag and iron production is as follows:

[0041] (1) Sinter ratio X1 + Pellet ratio X2 + Lump ore ratio X3 = 100.

[0042] (2) Batch iron content F = (sintered ore TFe content A1 × sintered ore ratio X1 + pellet ore TFe content A2 × pellet ore ratio X2 + lump ore TFe content A3 × lump ore ratio X3) × batch size K ÷ 10000.

[0043] (3) Coke batch J = coke ratio X4 × batch iron content F ÷ 1000.

[0044] (4) Slag quantity S1 = (Sintered ore CaO content B1 × Sintered ore proportion X1 + Pelletized ore CaO content B2 × Pelletized ore proportion X2 + Lump ore CaO content B3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke CaO content B4 × Coke batch J ÷ 100 + Pulverized coal CaO content B5 × Hourly coal quantity M ÷ Hourly material batch number H ÷ 100.

[0045] (5) Slag quantity S2 = (SiO2 content of sintered ore C1 × sintered ore proportion X1 + SiO2 content of pellet ore C2 × pellet ore proportion X2 + SiO2 content of lump ore C3 × lump ore proportion X3) × ore batch K ÷ 10000 + SiO2 content of coke C4 × coke batch J ÷ 100 + SiO2 content of pulverized coal C5 × hourly coal quantity M ÷ hourly batch number H ÷ 100 - 60 ÷ 28 × molten iron Si content × batch iron quantity F ÷ 100.

[0046] (6) Slag quantity S3 = (MgO content of sintered ore D1 × sintered ore proportion X1 + MgO content of pellet ore D2 × pellet ore proportion X2 + MgO content of lump ore D3 × lump ore proportion X3) × ore batch K ÷ 10000 + MgO content of coke D4 × coke batch J ÷ 100 + MgO content of pulverized coal D5 × hourly coal quantity M ÷ hourly material batch number H ÷ 100.

[0047] (7) Slag quantity S4 = (Sintered ore Al2O3 content E1 × Sintered ore proportion X1 + Pelletized ore Al2O3 content E2 × Pelletized ore proportion X2 + Lump ore Al2O3 content E3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke Al2O3 content E4 × Coke batch J ÷ 100 + Pulverized coal Al2O3 content E5 × Hourly coal quantity M ÷ Hourly material batch number H ÷ 100.

[0048] (8) Total slag amount S = Slag amount S1 + Slag amount S2 + Slag amount S3 + Slag amount S4.

[0049] (9) Slag and iron production = batch iron production F + batch total slag production S.

[0050] 2. The slag and iron discharge is measured in real time at the furnace. The slag and iron accumulation in the furnace is equal to the slag and iron production minus the slag and iron discharge. Slag and iron accumulation in the furnace = slag and iron production - slag and iron discharge.

[0051] 3. Blast Furnace Tapping Process: The blast furnace tapping sequence adopts a continuous cycle tapping mode. During normal production, the tapping sequence is: Tap No. 1 → Tap No. 2 → Tap No. 3 → Tap No. 4 → Tap No. 1… cyclic tapping; tapping time is 120±5 minutes. After 110 minutes of tapping, the next tap is opened earlier, with an overlap time of 5-15 minutes between the two taps. During normal production, a 58mm diameter drill bit is used. When the slag and iron accumulation is >10 tons, the next tap is opened earlier using a 62mm diameter drill bit to increase the overlap tapping time between the two taps. When the slag and iron accumulation is <-5 tons, a 55mm diameter drill bit is used at the next tap to reduce the tapping speed.

[0052] 4. The maintenance sequence of the taphole is clockwise and diagonally alternating. After maintenance, the taphole is sludge removed in sections, and the amount of sludge removed from each section is determined by the depth of the previous taphole section.

[0053] The taphole maintenance sequence is clockwise diagonal rotation, with the sequence being: Taphole 1 → Taphole 3 → Taphole 2 → Taphole 4 → Taphole 1... in a cyclical manner. This clockwise diagonal rotation taphole maintenance sequence is suitable for tapholes up to 4000m in length. 3 For the above-mentioned large blast furnaces, the number of blast furnace tapholes is ≥4.

[0054] The steps for the segmented replacement of the sludge in the taphole after maintenance are as follows:

[0055] (1) Replacement time: For the first replacement, the tap is opened 4 to 5 hours before the tap is put into the machine and then blocked within 2 minutes after opening; for the second replacement, the tap is opened 3 to 4 hours before the tap is put into the machine and then blocked within 2 minutes after opening; for the third replacement, the tap is opened 2.5 to 3 hours before the tap is put into the machine and then blocked within 2 minutes after opening; for the fourth replacement, the tap is opened 2 to 2.5 hours before the tap is put into the machine and then blocked within 2 minutes after opening.

[0056] (2) Amount of mud removed: Amount of mud removed during the first replacement is L÷L1×I×1.1; Amount of mud removed during the second replacement is L÷L2×I×1.05; Amount of mud removed during the third replacement is L÷L3×I×1.05; Amount of mud removed during the fourth replacement is L÷L4×I.

[0057] Where L is the taphole depth during normal production, in meters; L1 is the taphole depth during the first replacement, in meters; L2 is the taphole depth during the second replacement, in meters; L3 is the taphole depth during the third replacement, in meters; L4 is the taphole depth during the fourth replacement, in meters; and I is the amount of mud removed during normal production, in kilograms.

[0058] Example 1.

[0059] like Figure 1-Figure 2 As shown, a certain 5100m in China 3 The blast furnace has four tapholes and adopts a double rectangular tapping area with two tapping areas arranged symmetrically. Each tapping area has two tapholes with an angle of 81° between them.

[0060] A method for calculating blast furnace slag and iron accumulation and for clearing slag from the furnace front includes the following steps:

[0061] (1) Sintered ore index: TFe: 55.6%; CaO: 11%; SiO2: 5.62%; MgO: 1.59%; Al2O3: 1.97%; Pelletized ore index: TFe: 63.94%; CaO: 0.21%; SiO2: 6.61%; MgO: 0.32%; Al2O3: 0.86%; Lump ore index: TFe: 62.5%; CaO: 0.03% SiO2: 3.3%; MgO: 0.01%; Al2O3: 0.99%; Coke parameters: TFe: 0.3%; CaO: 0.26%; SiO2: 5.9%; MgO: 0.2%; Al2O3: 3.88%; Powdered coal parameters: TFe: 0.29%; CaO: 0.26%; SiO2: 4.47%; MgO: 0.2%; Al2O3: 3.47%.

[0062] (2) Ore ratio: 73% sinter, 10% pellets, 17% lump ore; Fuel ratio: 340 kg / t coke, 160 kg / t pulverized coal.

[0063] Batch ore quantity: 130,000 kg; Hourly coal quantity: 70,000 kg; Hourly material batches: 5.5 batches; Iron molten Si content: 0.35%.

[0064] (3) Calculation:

[0065] Iron content of batch = (TFe content of sintered ore × sintered ore ratio + TFe content of pellet ore × pellet ore ratio + TFe content of lump ore × lump ore ratio) × batch size = (55.6% × 73% + 63.94 × 10% + 62.5 × 17%) × 130000 = 74889 (kg).

[0066] Coke batch size = coke ratio × iron content of batch ÷ 1000 = 340 × 74889 ÷ 1000 = 25462 (kg).

[0067] Slag quantity S1 = (Sinter CaO content × Sinter ratio + Pellet CaO content × Pellet ratio + Lump ore CaO content × Lump ore ratio) × Ore batch + Coke CaO content × Coke batch + Pulverized coal CaO content × Hourly coal quantity ÷ Hourly material batches = (11% × 73% + 0.21% × 10% + 0.03% × 17%) × 130000 + 0.26% × 25462 + 0.26% × 160 ÷ 5.5 = 10572 (%).

[0068] Slag quantity S2 = (SiO2 content of sintered ore × sintered ore proportion + SiO2 content of pellets × pellets proportion + SiO2 content of lump ore × lump ore proportion) × ore batch + SiO2 content of coke × coke batch + SiO2 content of pulverized coal × hourly coal quantity ÷ number of batches per hour - 60 ÷ 28 × Si content of molten iron × iron quantity of batch F = (5.62% × 73% + 6.61% × 10% + 3.3% × 17%) × 130000 + 5.9% × 25462 + 4.47% × 160 ÷ 5.5 - 60 ÷ 28 × 0.35% × 74889 = 8431 (%).

[0069] Slag quantity S3 = (MgO content of sintered ore × sintered ore proportion + MgO content of pellets × pellets proportion + MgO content of lump ore × lump ore proportion) × ore batch + MgO content of coke × coke batch + MgO content of pulverized coal × hourly coal quantity ÷ number of batches of material per hour = (1.59% × 73% + 0.32% × 10% + 0.01% × 17%) × 130000 + 0.2% × 25462 + 0.2% × 160 ÷ 5.5 = 1629 (%).

[0070] Slag quantity S4 = (Sintered ore Al2O3 content × Sintered ore proportion + Pelletized ore Al2O3 content × Pelletized ore proportion + Lump ore Al2O3 content × Lump ore proportion) × Ore batch + Coke Al2O3 content × Coke batch + Pulverized coal Al2O3 content × Hourly coal quantity ÷ Hourly material batches = (1.97% × 73% + 0.86% × 10% + 0.99% × 17%) × 130000 + 3.88% × 25462 + 3.47% × 160 ÷ 5.5 = 3630 (%).

[0071] Total slag amount of batch = Slag amount S1 + Slag amount S2 + Slag amount S3 + Slag amount S4 = 10572 + 8431 + 1629 + 3630 = 24263 (kg).

[0072] Slag and iron production = Batch iron production + Batch total slag production = 74889 + 24263 = 99152 (kg).

[0073] (4) Adjustment of tapping:

[0074] The iron tapping sequence is: tap 1 → tap 2 → tap 4 → tap 1... tap 3 is under maintenance.

[0075] When the average iron velocity in the blast furnace is 8900 kg / min per hour, the slag and iron accumulation in the furnace = slag and iron production - slag and iron discharge = 99152 × 5.5 - 8900 × 60 = 11336 kg, and the slag and iron accumulation is 11.336 tons. Open the No. 2 taphole in advance and use a 62mm drill bit.

[0076] When the average iron velocity in the blast furnace is 9180 kg / min per hour, the slag and iron accumulation in the furnace = slag and iron production - slag and iron discharge = 99152 × 5.5 - 9180 × 60 = -5464 kg, the slag and iron accumulation is -5.464 tons, and the diameter of the next taphole opening drill bit changes from 58 mm to 55 mm.

[0077] (5) Iron tap maintenance sequence: Currently, iron tap No. 3 is under maintenance. The iron tap maintenance sequence is clockwise diagonal rotation: Iron tap No. 3 → Iron tap No. 2 → Iron tap No. 4 → Iron tap No. 1 → 3...

[0078] (6) Sectional replacement of the sludge in the taphole after maintenance:

[0079] During normal production, the average taphole depth is 3.9m and the amount of mud removed is 495kg.

[0080] The first replacement was carried out 4.5 hours after the tap was opened. The tap was blocked within 2 minutes after opening. The tap depth was 2.6 meters. The amount of mud removed was 3.9 ÷ 2.6 × 495 × 1.1 = 816.75 kg.

[0081] The second replacement was carried out 3.5 hours before the taphole was put in, and the taphole was blocked within 2 minutes after it was opened. The taphole depth was 3.3 meters, and the amount of mud removed was 3.9 ÷ 3.3 × 495 × 1.05 = 614.25 kg.

[0082] The third replacement was carried out 2.4 hours before the taphole was put into operation and then blocked within 2 minutes after opening. The taphole depth was 3.5 meters, and the amount of mud removed was 3.9 ÷ 3.5 × 495 × 1.05 = 579.15 kg.

[0083] The fourth replacement was carried out by opening the tap 2 hours before it was put into operation and then blocking it within 2 minutes after it was opened. The tap depth was 3.7m, and the amount of mud removed was 3.9 ÷ 3.7 × 495 = 521.76kg.

[0084] The data obtained from the above calculations are shown in Table 2:

[0085]

[0086] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0087] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A method for calculating the amount of blast furnace slag and iron accumulation and for clearing it from the furnace front, characterized in that, Includes the following steps: S1. Calculate the amount of slag and iron produced by analyzing the composition and ratio of ore and fuel. S2. The amount of slag and iron discharged is measured in real time at the furnace front. The amount of slag and iron accumulated in the furnace is equal to the amount of slag and iron generated minus the amount of slag and iron discharged. S3. The blast furnace tapping sequence adopts clockwise overlapping tapping from the tapholes. When the slag and iron accumulation is >10 tons, the next taphole is opened in advance, using a 62mm diameter drill bit to increase the overlapping tapping time of the two tapholes. When the slag and iron accumulation is <-5 tons, a 55mm diameter drill bit is used for the next taphole. S4. The maintenance sequence of the taphole is clockwise and diagonally alternating. After maintenance, the taphole is replaced with mud in sections, and the amount of mud removed from each section is determined by the depth of the previous taphole section.

2. The method for calculating blast furnace slag and iron accumulation and for clearing out slag in front of the furnace as described in claim 1, characterized in that, The types of ore in step S1 include sinter, pellets, and lump ore. The content indicators of the ore include TFe, CaO, SiO2, MgO, and Al2O3 in sinter; TFe, CaO, SiO2, MgO, and Al2O3 in pellets; and TFe, CaO, SiO2, MgO, and Al2O3 in lump ore. The types of fuels include coke and pulverized coal. The content indicators of the fuels include TFe, CaO, SiO2, MgO, and Al2O3 in coke and TFe, CaO, SiO2, MgO, and Al2O3 in pulverized coal.

3. The method for calculating blast furnace slag and iron accumulation and for clearing out slag in front of the furnace as described in claim 2, is characterized in that, The calculation of the slag and iron production in step S1 is as follows: S11, Sintered ore ratio X1 + Pelletized ore ratio X2 + Lump ore ratio X3 = 100; S12, Batch iron content F = (Sintered ore TFe content A1 × Sintered ore ratio X1 + Pelletized ore TFe content A2 × Pelletized ore ratio X2 + Lump ore TFe content A3 × Lump ore ratio X3) × Batch size K ÷ 10000; S13, Coke batch J = Coke ratio X4 × Iron content of batch F ÷ 1000; S14, Slag quantity S1 = (Sinter CaO content B1 × Sinter proportion X1 + Pellet CaO content B2 × Pellet proportion X2 + Lump ore CaO content B3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke CaO content B4 × Coke batch J ÷ 100 + Pulverized coal CaO content B5 × Hourly coal quantity M ÷ Hourly material batches H ÷ 100; S15, Slag quantity S2 = (Sintered ore SiO2 content C1 × Sintered ore proportion X1 + Pelletized ore SiO2 content C2 × Pelletized ore proportion X2 + Lump ore SiO2 content C3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke SiO2 content C4 × Coke batch J ÷ 100 + Pulverized coal SiO2 content C5 × Hourly coal quantity M ÷ Hourly batch number H ÷ 100 - 60 ÷ 28 × Hot iron Si content × Batch iron quantity F ÷ 100; S16, Slag quantity S3 = (MgO content of sintered ore D1 × sintered ore proportion X1 + MgO content of pellets D2 × pellets proportion X2 + MgO content of lump ore D3 × lump ore proportion X3) × ore batch K ÷ 10000 + MgO content of coke D4 × coke batch J ÷ 100 + MgO content of pulverized coal D5 × hourly coal quantity M ÷ hourly material batch number H ÷ 100; S17, Slag quantity S4 = (Sintered ore Al2O3 content E1 × Sintered ore proportion X1 + Pelletized ore Al2O3 content E2 × Pelletized ore proportion X2 + Lump ore Al2O3 content E3 × Lump ore proportion X3) × Ore batch K ÷ 10000 + Coke Al2O3 content E4 × Coke batch J ÷ 100 + Pulverized coal Al2O3 content E5 × Hourly coal quantity M ÷ Hourly material batch number H ÷ 100; S18, Total slag amount of batch material S = Slag amount S1 + Slag amount S2 + Slag amount S3 + Slag amount S4; S19, Slag and iron production = Iron production in batch F + Total slag production in batch S.

4. The method for calculating blast furnace slag and iron accumulation and for clearing waste in front of the furnace as described in claim 1, characterized in that, In step S3, the blast furnace tapping sequence adopts a clockwise continuous cyclic tapping mode. During normal production, the tapping sequence is: tapping from tapping point 1 → tapping point 2 → tapping point 3 → tapping point 4 → tapping point 1... cyclic tapping; the tapping time is 120±5 minutes. After tapping for 110 minutes, the next tapping point is opened in advance, and the overlap time between the two tapping points is 5-15 minutes; during normal production, a 58mm diameter drill bit is used.

5. The method for calculating blast furnace slag and iron accumulation and for clearing out slag in front of the furnace as described in claim 1, characterized in that, The maintenance sequence of the taps in step S4 is clockwise diagonal rotation, with the diagonal rotation sequence being tap 1 → tap 3 → tap 2 → tap 4 → tap 1... cyclical maintenance.

6. The method for calculating blast furnace slag and iron accumulation and for clearing waste in front of the furnace as described in claim 5, is characterized in that, The maintenance sequence for the tapholes is a clockwise diagonal rotation, applicable to 4000m. 3 For the above-mentioned large blast furnaces, the number of blast furnace tapholes is ≥4.

7. The method for calculating blast furnace slag and iron accumulation and for clearing out slag in front of the furnace as described in claim 1, characterized in that, The step of segmental replacement of the sludge in the taphole after maintenance in step S4 is as follows: S41. Replacement time: For the first replacement, open the tap 4-5 hours before the tap is put into the system and close the tap within 2 minutes after opening; for the second replacement, open the tap 3-4 hours before the tap is put into the system and close the tap within 2 minutes after opening; for the third replacement, open the tap 2.5-3 hours before the tap is put into the system and close the tap within 2 minutes after opening; for the fourth replacement, open the tap 2-2.5 hours before the tap is put into the system and close the tap within 2 minutes after opening. S42. Amount of mud removed: Amount of mud removed during the first replacement, L÷L1×I×1.1; Amount of mud removed during the second replacement, L÷L2×I×1.05; Amount of mud removed during the third replacement, L÷L3×I×1.05; Amount of mud removed during the fourth replacement, L÷L4×I. Where L is the taphole depth during normal production, in meters; L1 is the taphole depth during the first replacement, in meters; L2 is the taphole depth during the second replacement, in meters; L3 is the taphole depth during the third replacement, in meters; L4 is the taphole depth during the fourth replacement, in meters; and I is the amount of mud removed during normal production, in kilograms.

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