A blast furnace molten iron temperature control method, device, equipment and medium

Abstract

The application discloses a blast furnace molten iron temperature control method, device, equipment and medium, comprising the following steps: after the blast furnace is blown down, the target temperature difference is determined according to the highest temperature of the first target area in the hearth of the blast furnace and the temperature of the center of the first target area; the second target area is determined from the first target area according to the position of the center and the first target distance; and the molten iron temperature control range of the blast furnace is determined according to the slag-iron mass ratio in the second target area, the average coke particle size in the second target area and the target temperature difference of the first target area. After the blast furnace is blown down, the molten iron temperature control range in the blast furnace can be determined according to the slag-iron mass ratio in the second target area, the average coke particle size in the second target area and the target temperature difference, which provides a theoretical basis for accurately determining the molten iron temperature control range in the blast furnace.

Description

Technical Field

[0001] This invention relates to the field of blast furnace smelting, and more particularly to a method, apparatus, equipment, and medium for controlling the temperature of molten iron in a blast furnace. Background Technology

[0002] During blast furnace production, iron ore, coke, and flux for slag formation are charged from the top of the furnace. At high temperatures, the coke burns with oxygen in the blast furnace to produce gases such as carbon monoxide and hydrogen. The carbon monoxide and hydrogen remove oxygen from the iron ore within the furnace, and molten iron is obtained at high temperatures. In blast furnace processes related to ironmaking, the temperature of the molten iron is a crucial control parameter.

[0003] During blast furnace production, the temperature of molten iron is typically controlled between 1485℃ and 1520℃. When the blast furnace condition is good, the molten iron temperature can be adjusted to reduce the fuel ratio in order to further improve production efficiency. However, currently, only a general range for molten iron temperature control is known. Because the adjustable temperature range is large and there is a lack of precise theoretical basis for temperature control, the adjusted temperature may not be compatible with the blast furnace condition, leading to fluctuations in furnace conditions, unstable blast furnace operation, and reduced production efficiency. Conversely, when the blast furnace condition is poor, too many factors influence it. While adjusting the molten iron temperature can improve the furnace condition, this also lacks a theoretical basis, resulting in a longer adjustment cycle and impacting production efficiency. Therefore, accurately controlling the molten iron temperature range in a blast furnace is a problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a method, apparatus, equipment, and medium for controlling blast furnace molten iron temperature, which solves the technical problem in the prior art that the control range of blast furnace molten iron temperature cannot be determined under different furnace conditions, and achieves the technical effect of accurately controlling the range of blast furnace molten iron temperature.

[0005] In a first aspect, this application provides a method for controlling the temperature of molten iron in a blast furnace, the method comprising:

[0006] After the blast furnace is shut down, the target temperature difference is determined based on the highest temperature of the first target area in the hearth and the temperature of the center of the first target area. The first target area refers to the area that is parallel to the plane where the bottom of the hearth is located and has the same height as the tuyeres of the blast furnace.

[0007] Based on the location of the center and the distance to the first target, a second target area is determined from the first target area. The first target distance is the radius of the center area of ​​the dead material column of the blast furnace.

[0008] The blast furnace molten iron temperature control range is determined based on the slag-to-iron mass ratio and average coke particle size in the second target area, as well as the target temperature difference in the first target area.

[0009] Furthermore, based on the slag-to-iron mass ratio and average coke particle size within the second target region, and the target temperature difference within the first target region, the blast furnace molten iron temperature control range is determined, including:

[0010] If the average coke particle size is less than 5mm, the target temperature difference is greater than 280℃ and less than 500℃, and the slag-iron mass ratio is greater than 50%, the molten iron temperature control range is determined to be 1505℃ to 1518℃.

[0011] Furthermore, based on the slag-to-iron mass ratio and average coke particle size within the second target region, and the target temperature difference within the first target region, the blast furnace molten iron temperature control range is determined, including:

[0012] If the average coke particle size is greater than or equal to 5 mm, the target temperature difference is greater than 180℃ and less than 280℃, and the slag-iron mass ratio is less than 35%, the molten iron temperature control range is determined to be 1490℃ to 1502℃.

[0013] Furthermore, based on the slag-to-iron mass ratio and average coke particle size within the second target region, and the target temperature difference within the first target region, the blast furnace molten iron temperature control range is determined, including:

[0014] If the average coke particle size is less than 5mm, the target temperature difference is greater than 220℃ and less than 350℃, and the slag-iron mass ratio is greater than 35% and less than 50%, the molten iron temperature control range is determined to be 1500℃ to 1510℃.

[0015] Furthermore, the mass ratio of slag and iron within the second target area is determined, including:

[0016] The proportion of slag mass is determined based on the total mass of materials in the second target area and the slag mass in the second target area.

[0017] The proportion of pig iron mass is determined based on the total mass and the pig iron mass within the second target area;

[0018] The slag-iron mass ratio is determined based on the mass ratio of pig iron and slag.

[0019] Further, the average particle size of coke within the second target region is determined, including:

[0020] For multiple coke particles within the second target area, the preset particle size range to which each coke particle belongs is determined based on multiple preset particle size ranges and the particle size of the coke.

[0021] For multiple preset particle size ranges, the mass ratio of coke in each preset particle size range is determined based on the mass of each coke particle within the preset particle size range and the mass of multiple coke particles within the second target area.

[0022] For multiple preset granularity ranges, the target granularity corresponding to each preset granularity range is determined based on the threshold of the preset granularity range.

[0023] The average coke particle size in the second target area is determined based on the target particle size of each preset particle size range and the coke mass ratio of each preset particle size range.

[0024] Furthermore, based on the highest temperature of the first target region within the blast furnace hearth and the temperature at the center of the first target region, the target temperature difference is determined, including:

[0025] The target temperature difference is determined based on the highest temperature in the first target area during the first preset time period and the average temperature at the center during the first preset time period.

[0026] Secondly, this application provides a blast furnace molten iron temperature control device, the device comprising:

[0027] The first area determination module is used to determine the target temperature difference after the blast furnace is shut down, based on the highest temperature of the first target area in the hearth and the temperature of the center of the first target area. The first target area refers to the area that is parallel to the plane where the bottom of the hearth is located and has the same height as the tuyeres of the blast furnace.

[0028] The second region determination module is used to determine the second target region from the first target region based on the location of the center and the first target distance, where the first target distance is the radius of the center region of the dead material column of the blast furnace.

[0029] The temperature range determination module is used to determine the blast furnace molten iron temperature control range based on the slag-iron mass ratio and average coke particle size in the second target area and the target temperature difference in the first target area.

[0030] Thirdly, this application provides an electronic device, comprising:

[0031] processor;

[0032] Memory used to store processor-executable instructions;

[0033] The processor is configured to execute a method for controlling the temperature of molten iron in a blast furnace as provided in the first aspect.

[0034] Fourthly, this application provides a non-transitory computer-readable storage medium that, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform a blast furnace molten iron temperature control method as provided in the first aspect.

[0035] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0036] This application determines a target temperature difference after a blast furnace shutdown, based on the highest temperature of a first target area within the hearth and the temperature at the center of that first target area. A second target area is then determined from the first target area based on the center's location and the distance to the first target area. Finally, the blast furnace's hot metal temperature control range is determined based on the slag-to-iron mass ratio and average coke particle size within the second target area, along with the target temperature difference from the first target area. This application, after a blast furnace shutdown, can reflect the current blast furnace condition to a certain extent based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference within the second target area. Furthermore, it allows for precise control of the blast furnace's hot metal temperature range, thereby achieving the goal of reducing the blast furnace's fuel-to-heat ratio or improving its overall condition.

[0037] When the blast furnace condition is good, this application determines the molten iron temperature control range within the blast furnace based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference. This further reduces the blast furnace fuel ratio, improves production efficiency, and ensures the adjusted molten iron temperature range is adapted to the furnace condition, maintaining a consistently good furnace condition. When the blast furnace condition is poor, this application can also determine the molten iron temperature control range based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference. This can improve the blast furnace condition, shorten the blast furnace recovery cycle, and increase production efficiency. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart illustrating a method for controlling molten iron temperature in a blast furnace, as provided in this application;

[0040] Figure 2 This is a cross-sectional structural schematic diagram of a blast furnace provided in this application;

[0041] Figure 3 for Figure 2 A top-down structural diagram of the first target area in the middle;

[0042] Figure 4 A schematic diagram of a blast furnace molten iron temperature control device provided in this application;

[0043] Figure 5 This is a schematic diagram of the structure of an electronic device provided in this application. Detailed Implementation

[0044] This application provides a method for controlling the temperature of molten iron in a blast furnace, which solves the technical problem in the prior art that the control range of molten iron temperature cannot be determined under different furnace conditions, and achieves the technical effect of accurately controlling the range of molten iron temperature in a blast furnace.

[0045] The technical solution of this application embodiment is to solve the above-mentioned technical problems, and the general idea is as follows:

[0046] A method for controlling the temperature of molten iron in a blast furnace includes: after the blast furnace is shut down, determining a target temperature difference based on the highest temperature of a first target area within the hearth and the temperature at the center of the first target area, wherein the first target area is a region parallel to the plane at the bottom of the hearth and at the same height as the tuyeres of the blast furnace; determining a second target area from the first target area based on the location of the center and the first target distance, wherein the first target distance is the radius of the center region of the dead charge column of the blast furnace; and determining the molten iron temperature control range of the blast furnace based on the slag-iron mass ratio and average coke particle size within the second target area and the target temperature difference within the first target area.

[0047] This application determines a target temperature difference after a blast furnace shutdown, based on the highest temperature of a first target area within the hearth and the temperature at the center of that first target area. A second target area is then determined from the first target area based on the center's location and the distance to the first target area. Finally, the blast furnace's hot metal temperature control range is determined based on the slag-to-iron mass ratio and average coke particle size within the second target area, along with the target temperature difference from the first target area. This application, after a blast furnace shutdown, can reflect the current blast furnace condition to a certain extent based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference within the second target area. Furthermore, it allows for precise control of the blast furnace's hot metal temperature range, thereby achieving the goal of reducing the blast furnace's fuel-to-heat ratio or improving its overall condition.

[0048] When the blast furnace condition is good, this application determines the molten iron temperature control range within the blast furnace based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference. This further reduces the blast furnace fuel ratio, improves production efficiency, and ensures the adjusted molten iron temperature range is adapted to the furnace condition, maintaining a consistently good furnace condition. When the blast furnace condition is poor, this application can also determine the molten iron temperature control range based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference. This can improve the blast furnace condition, shorten the blast furnace recovery cycle, and increase production efficiency.

[0049] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0050] First, it should be clarified that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0051] This application provides, as follows: Figure 1 The method for controlling the temperature of molten iron in a blast furnace is shown, including steps S11-S13.

[0052] Step S11: After the blast furnace is shut down, determine the target temperature difference based on the highest temperature of the first target area in the hearth of the blast furnace and the temperature of the center of the first target area. The first target area refers to the area that is parallel to the plane where the bottom of the hearth is located and has the same height as the tuyeres of the blast furnace.

[0053] Step S12: Based on the location of the center and the first target distance, determine the second target area from the first target area. The first target distance is the radius of the center area of ​​the dead material column of the blast furnace.

[0054] Step S13: Determine the blast furnace molten iron temperature control range based on the slag-iron mass ratio and average coke particle size in the second target area and the target temperature difference in the first target area.

[0055] Regarding step S11, after the blast furnace is shut down, the target temperature difference is determined based on the highest temperature of the first target area in the hearth of the blast furnace and the temperature of the center of the first target area. The first target area refers to the area that is parallel to the plane where the bottom of the hearth is located and has the same height as the tuyeres of the blast furnace.

[0056] Blast furnace shutdown refers to the temporary cessation of air supply to the blast furnace. Gas explosions and gas poisoning accidents are prone to occur during shutdowns. Blast furnace shutdowns are often used for maintenance work, such as changing tuyeres or welding repairs to the gas system. Figure 2 This is a cross-sectional structural diagram of a blast furnace. When air is stopped flowing into the blast furnace through tuyeres F, it is considered a blast furnace shutdown. It should be noted that there are multiple tuyeres in the blast furnace. Figure 1 The blast furnace in the image only shows one tuyere F.

[0057] The hearth is a structural area within a blast furnace. Its main functions are to protect the furnace bottom, collect molten iron, and collect slag and other materials (such as coke, slag, and pig iron slag). Figure 2 Region R in the diagram represents the hearth of the blast furnace.

[0058] The plane containing the first target area inside the hearth is parallel to the plane containing the bottom of the hearth, and the height of the first target area is the same as the height of the tuyeres of the blast furnace. Specifically, the height of the first target area can be the same as the height of the horizontal centerline of the tuyeres of the blast furnace.

[0059] The shape of the first target area is the shape of the area enclosed by the inner wall of the hearth at the same height. Since the hearth is usually cylindrical, the shape of the first target area is usually circular. Figure 2 In the middle, the first target area P is parallel to the plane K where the bottom of the hearth is located. Figure 3 for Figure 2 A top-down structural diagram of the first target region P.

[0060] Since the shape of the first target area is usually circular, the center of the first target area is also the center of the first target area. Figure 3 In the diagram, the center O of the first target region is also the center of the circle of the first target region.

[0061] After the blast furnace is shut down, the target temperature difference can be determined based on the difference between the highest temperature in the first target area inside the hearth and the temperature at the center of the first target area.

[0062] Specifically, the target temperature difference can be determined based on the difference between the highest temperature in the first target area during the first preset time period and the average temperature at the center during the first preset time period.

[0063] After a blast furnace is shut down, due to its good insulation properties, the temperature inside the blast furnace will fluctuate somewhat during the first preset time period (the specific length of the first preset time period can be determined based on the parameters of the blast furnace's insulation material). However, the fluctuation range will be small, and the changes in the maximum temperature and the center temperature will be minimal. Therefore, the accuracy of the target temperature difference determined based on the difference between the maximum temperature and the average temperature at the center during the first preset time period is relatively high.

[0064] Regarding step S12, based on the location of the center and the first target distance, a second target area is determined from the first target area. The first target distance is the radius of the center area of ​​the dead material column of the blast furnace.

[0065] The central region of the dead charge column in a blast furnace refers to the area formed by the accumulation of most of the coke in the hearth. The second target region can be determined from the first target region based on the radius of the central region of the dead charge column and the position of the center of the first target region.

[0066] Specifically, a circle can be constructed within the first target area, with the center of the first target area as the center and the distance from the first target as the radius. This circle within the first target area is the second target area. For example... Figure 3 In the diagram, the center of the first target region is point O, the distance to the first target is L, and the second target region W is constructed with point O as the center and L as the radius.

[0067] It should be noted that the length of the first target distance is approximately 0.25-0.3 times the radius of the furnace hearth. Therefore, the second target area can also be determined based on the radius of the furnace hearth and the center of the first target area.

[0068] Regarding step S13, the blast furnace molten iron temperature control range is determined based on the slag-iron mass ratio and average coke particle size in the second target area and the target temperature difference in the first target area.

[0069] After determining the second target region from the first target region, the second target region also includes materials such as coke, slag, and pig iron slag. The mass ratio of slag and iron in the second target region and the average particle size of coke in the second target region can be determined respectively.

[0070] [Determine the slag and iron mass ratio within the second target area]

[0071] The total mass of all slag and slag in the second target area is recorded as the total mass of materials within that area. The slag-iron mass ratio within the second target area can be determined according to either Method 1 or Method 2.

[0072] {Method 1}

[0073] The slag-iron mass in the second target area is determined by summing the masses of slag and pig iron slag. Then, the slag-iron mass ratio within the second target area is determined based on the combined slag-iron mass and the total mass of materials within the area. For example, if the slag mass is 50g, the pig iron slag mass is 50g, and the total mass of materials is 200g, the slag-iron mass in the second target area is 50g + 50g = 100g, and the slag-iron mass ratio is 100g ÷ 200g = 50%.

[0074] {Method 2}

[0075] The slag mass percentage is determined based on the total mass of materials within the second target area and the slag mass within the second target area; the pig iron mass percentage is determined based on the total mass and the pig iron mass within the second target area; and the slag-iron mass percentage is determined based on the pig iron mass percentage and the slag mass percentage. For example, within the second target area, with 50g of slag, 50g of pig iron, and a total material mass of 200g, the pig iron mass percentage is 50g ÷ 200g = 25%, the slag mass percentage is 50g ÷ 200g = 25%, and the slag-iron mass percentage is 25% + 25% = 50%.

[0076] [Determine the average particle size of coke within the second target area]

[0077] The slag in the second target area includes not only furnace slag and pig iron slag, but also coke. The average particle size of the coke in the second target area can be determined based on the particle size and mass of each coke particle.

[0078] Specifically, this may include: for multiple coke particles within the second target area, determining the preset particle size range to which each coke particle belongs based on multiple preset particle size ranges and the particle size of the coke; for multiple preset particle size ranges, determining the coke mass percentage of each preset particle size range based on the sum of the mass of each coke particle within the preset particle size range and the sum of the mass of multiple coke particles within the second target area; for multiple preset particle size ranges, determining the target particle size corresponding to each preset particle size range based on the threshold of the preset particle size range; and determining the average coke particle size within the second target area based on the target particle size of each preset particle size range and the coke mass percentage of each preset particle size range.

[0079] For multiple coke particles within the second target area, based on multiple preset particle size ranges and the particle size of the coke, the preset particle size range to which each coke particle belongs is determined, including:

[0080] The second target area contains a large number of coke particles, and the particle size of each coke particle is not completely the same. For the multiple coke particles in the second target area, the preset particle size range to which each coke particle belongs can be determined based on multiple preset particle size ranges and the particle size of the coke.

[0081] For example, a certain coke G has a particle size of 8mm, and the preset particle size ranges are A: 5mm-10mm, C: 10mm-25mm, and E: 25mm-40mm, where 5mm < 8mm < 10mm. Therefore, coke G belongs to the preset particle size range A.

[0082] For multiple preset particle size ranges, the coke mass percentage of each preset particle size range is determined based on the sum of the mass of each coke particle within the preset particle size range and the sum of the mass of multiple coke particles within the second target area, including:

[0083] For example, if the preset particle size range A includes 580 coke particles, the total mass of the 580 coke particles is 3.5g, and the total mass of coke in the second target area is 10g, then the mass percentage of coke corresponding to the preset particle size range A is 3.5g ÷ 10g = 35%.

[0084] For multiple preset granularity ranges, the target granularity corresponding to each preset granularity range is determined based on the threshold of the preset granularity range, including:

[0085] The target granularity of the preset granularity range is determined by the average of the maximum and minimum thresholds of the preset granularity range.

[0086] For example, if the preset particle size range A is 5mm-10mm, then the maximum threshold of the preset particle size range A is 10mm, the minimum threshold of the preset particle size range A is 5mm, and the target particle size of the preset particle size range A is (5mm+10mm)÷2=7.5mm.

[0087] Based on the target particle size of each preset particle size range and the proportion of coke mass within each preset particle size range, the average coke particle size within the second target area is determined, including:

[0088] The product of the target particle size of each preset particle size range and the coke mass percentage of each preset particle size range is the arithmetic mean particle size of each preset particle size range. The average coke particle size in the second target area is determined based on the sum of the arithmetic mean particle sizes corresponding to the preset particle size ranges.

[0089] For example, if the target particle size for preset particle size range A is 7.5 mm, and the coke mass percentage corresponding to preset particle size range A is 35%, then the arithmetic mean particle size for preset particle size range A is 7.5 mm × 35% = 2.625 mm. If the arithmetic mean particle size for preset particle size range C is 1.91 mm, and the arithmetic mean particle size for preset particle size range E is 2.01 mm, then the average coke particle size in the second target area is 2.625 mm + 1.813 mm + 2.532 mm = 6.970 mm.

[0090] After determining the slag-to-iron mass ratio, the average coke particle size within the second target area, and the target temperature difference, the molten iron temperature control range within the blast furnace can be determined. Specifically, the molten iron temperature control range can be determined under various conditions depending on the blast furnace's condition. This embodiment only uses [Case 1], [Case 2], and [Case 3] as examples for illustration.

[0091] During blast furnace production, the molten iron temperature is typically controlled between 1485℃ and 1520℃, and this temperature needs to be compatible with the furnace conditions. When the furnace conditions are good, the molten iron temperature can be adjusted to reduce the blast furnace fuel ratio in order to further improve production efficiency. However, currently, only the approximate range of molten iron temperature control (1485℃ to 1520℃) is known, and the adjustable temperature range is relatively large (1520℃ - 1485℃ = 45℃). There is a lack of theoretical basis for accurately controlling the molten iron temperature range, which may lead to the adjusted molten iron temperature being incompatible with the furnace conditions, resulting in furnace condition fluctuations, unstable blast furnace operation, and reduced production efficiency. Furthermore, when the blast furnace conditions are poor, there are too many factors affecting them. Although adjusting the molten iron temperature can improve the furnace conditions, there is again a lack of theoretical basis, resulting in a longer adjustment cycle and impacting production efficiency.

[0092] Therefore, the purpose of this application is to provide a theoretical basis for determining the control range of molten iron temperature, and to reduce the blast furnace fuel ratio or improve furnace conditions by adjusting the molten iron temperature to be within the target molten iron temperature control range.

[0093]

Scenario 1

[0094] If the average particle size is less than 5 mm, the target temperature difference is greater than 280℃ and less than 500℃, and the slag-iron mass ratio is greater than 50%, then the molten iron temperature control range is 1505℃ to 1518℃.

[0095] The total mass of coke in the second target region does not change significantly during blast furnace ironmaking, and the shape of the hearth remains unchanged. When the average coke particle size in the second target region is less than 5 mm, the gaps between coke particles can be considered small. A coke particle size less than 5 mm in the second target region is considered too small; a coke particle size less than or equal to 5 mm in the second target region is considered too large (with larger gaps between coke particles).

[0096] When the coke particle size is too small, the gaps between the coke particles are small, making it difficult for slag and iron to flow in the second zone. This difficulty in slag and iron flow in the second zone is not conducive to slag and iron discharge and may cause hearth blockage. Therefore, in order to improve the current blast furnace condition, the molten iron temperature can be maintained at a higher level. When the molten iron temperature is maintained at a higher level, it is conducive to slag and iron flow, which means that the blast furnace condition is improved.

[0097] When the target temperature difference is greater than 280℃ and less than 500℃, it can be considered that the temperature difference between the center and the highest temperature in the second (first) region is large. A target temperature difference greater than 280℃ and less than 500℃ is recorded as a large target temperature difference.

[0098] A large target temperature difference indicates difficulty in the gas flow penetrating to the center of the hearth. This is because the gas flow contains a significant amount of sensible heat; when the flow is difficult, this sensible heat cannot be transferred smoothly, causing the gas to concentrate near the highest temperature area, resulting in a large target temperature difference. Therefore, to improve the current blast furnace condition and reduce the difficulty of gas flow penetrating to the hearth center, the molten iron temperature can be maintained at a higher level. Reduced difficulty in gas flow penetrating to the hearth center is beneficial for various chemical reactions in the blast furnace, which means the blast furnace condition has been adjusted.

[0099] When the slag-iron mass ratio is greater than 50%, the chemical reaction between iron ore and coke can be considered primarily a direct reduction reaction (C + FeO = FeO + CO (high temperature)). This direct reaction consumes a significant amount of energy. Therefore, to facilitate a smoother direct reduction reaction between iron ore and coke, the molten iron temperature should be maintained at a higher level. Maintaining a higher temperature accelerates the direct reduction reaction between iron ore and coke.

[0100] Through numerous experiments, the inventors discovered that when the molten iron temperature is controlled within the range of 1505℃ to 1518℃, it can be considered that the molten iron temperature is maintained at a relatively high level. When the average particle size is less than 5mm, the target temperature difference is greater than 280℃ but less than 500℃, and the slag-iron mass ratio is greater than 50%, controlling the molten iron temperature at 1505℃ to 1518℃ can improve furnace conditions and increase blast furnace output.

[0101]

Scenario 2

[0102] If the average particle size is greater than or equal to 5 mm, the target temperature difference is greater than 180℃ and less than 280℃, and the slag-iron mass ratio is less than 35%, then the molten iron temperature control range is 1490℃ to 1502℃.

[0103] When the average coke particle size is greater than or equal to 5mm, the larger coke particle size results in larger gaps between coke particles. This leads to lower flow resistance of slag and iron in the second region, allowing for smoother discharge of the slag and iron without requiring additional heat energy from the molten iron. Therefore, the molten iron temperature can be controlled at a lower level, which reduces the blast furnace fuel ratio.

[0104] When the target temperature difference is greater than 180℃ and less than 280℃, it can be considered that the temperature difference between the center and the highest temperature in the second (first) region is small. A target temperature difference greater than 180℃ and less than 280℃ is recorded as a small target temperature difference.

[0105] When the target temperature difference is small, it indicates that the gas flow is easier to penetrate into the center of the hearth. Because the gas flow contains a large amount of sensible heat, a smaller target temperature difference means the gas flow can move relatively smoothly within the hearth, indicating that penetration into the hearth is easier and requires no additional heat from the molten iron to aid its flow. Therefore, the molten iron temperature can be controlled at a lower level, which can reduce the blast furnace fuel ratio.

[0106] When the slag-to-iron mass ratio is less than 35%, it indicates a lower proportion of direct reduction reaction between iron ore and coke. This means less energy is consumed, as no additional heat from the molten iron is needed to facilitate the direct reduction reaction. Therefore, the molten iron temperature can be controlled at a lower level, which reduces the blast furnace fuel ratio.

[0107] Through numerous experiments, the inventors discovered that when the molten iron temperature is controlled within the range of 1490℃ to 1502℃, it can be considered that the molten iron temperature is maintained at a relatively low level. When the average particle size is greater than or equal to 5mm, the target temperature difference is greater than 180℃ and less than 280℃, and the slag-iron mass ratio is less than 35%, controlling the molten iron temperature between 1490℃ and 1502℃ can reduce the blast furnace fuel ratio.

[0108]

Scenario 3

[0109] If the average particle size is less than 5 mm, the target temperature difference is greater than 220℃ and less than 350℃, and the slag-iron mass ratio is greater than 35% and less than 50%, then the molten iron temperature control range is 1500℃ to 1510℃.

[0110] When the average coke particle size is less than 5mm, the gaps between coke particles are smaller, making it more difficult for slag and iron to flow in the second zone. This difficulty in slag and iron flow in the second zone is not conducive to slag and iron discharge and may cause hearth blockage. Therefore, in order to improve the current blast furnace condition, the molten iron temperature can be maintained at a higher level. When the molten iron temperature is maintained at a higher level, it is conducive to slag and iron flow, which means that the blast furnace condition is improved.

[0111] When the target temperature difference is greater than 220℃ and less than 350℃, the difference between the temperature at the center and the highest temperature in the second (first) region can be considered large. A target temperature difference greater than 280℃ and less than 500℃ is recorded as a large target temperature difference.

[0112] When the target temperature difference is large, it indicates that it is more difficult for the gas flow to penetrate to the center of the hearth. The difficulty of the gas flow penetrating to the center of the hearth is lower than in "Scenario 1" but higher than in "Scenario 2". In order to reduce the difficulty of the gas flow penetrating to the center of the hearth, the temperature of the molten iron should be maintained at a medium level.

[0113] When the slag-iron mass ratio is greater than 35% and less than 50%, it indicates that the proportion of iron ore undergoing a direct reduction reaction with coke is lower than in "Scenario 1" but higher than in "Scenario 2," requiring an appropriate amount of heat energy to be provided for the reduction reaction between iron ore and coke. Therefore, the temperature of the molten iron should be maintained at a moderate level.

[0114] By combining the molten iron temperature required for an average particle size of less than 5mm, the molten iron temperature required for a target temperature difference greater than 220℃ and less than 350℃, and the molten iron temperature required for a slag-iron mass ratio greater than 35% and less than 50%, the molten iron temperature can be maintained at a medium-to-high level.

[0115] Through numerous experiments, the inventors discovered that when the molten iron temperature is controlled within the range of 1500℃ to 1510℃, it can be considered that the molten iron temperature is maintained at a medium-to-high level. When the average particle size is less than 5mm, the target temperature difference is greater than 220℃ and less than 350℃, and the slag-iron mass ratio is greater than 35% and less than 50%, controlling the molten iron temperature at 1500℃ to 1510℃ can appropriately reduce the blast furnace fuel ratio and appropriately improve the furnace condition.

[0116] In summary, this application determines the target temperature difference after a blast furnace shutdown based on the highest temperature of the first target area within the hearth and the temperature at the center of the first target area. Based on the location of the center and the distance to the first target area, a second target area is determined from the first target area. The blast furnace's hot metal temperature control range is then determined based on the slag-to-iron mass ratio and average coke particle size within the second target area, as well as the target temperature difference between the first and second target areas. This application, after a blast furnace shutdown, can reflect the current blast furnace condition to a certain extent based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference within the second target area. Furthermore, it can precisely control the blast furnace's hot metal temperature range based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference, thereby achieving the goal of reducing the blast furnace's combustion heat ratio or improving its condition.

[0117] When the blast furnace condition is good, this application determines the molten iron temperature control range within the blast furnace based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference. This further reduces the blast furnace fuel ratio, improves production efficiency, and ensures the adjusted molten iron temperature range is adapted to the furnace condition, maintaining a consistently good furnace condition. When the blast furnace condition is poor, this application can also determine the molten iron temperature control range based on the slag-to-iron mass ratio, average coke particle size, and target temperature difference. This can improve the blast furnace condition, shorten the blast furnace recovery cycle, and increase production efficiency.

[0118] Based on the same inventive concept, this application provides as follows Figure 4 The device shown is a blast furnace molten iron temperature control device, the device includes:

[0119] The first area determination module 41 is used to determine the target temperature difference after the blast furnace is shut down, based on the highest temperature of the first target area in the hearth of the blast furnace and the temperature of the center of the first target area. The first target area refers to the area that is parallel to the plane where the bottom of the hearth is located and has the same height as the tuyeres of the blast furnace.

[0120] The second region determination module 42 is used to determine the second target region from the first target region based on the position of the center and the first target distance, where the first target distance is the radius of the center region of the dead material column of the blast furnace.

[0121] The temperature range determination module 43 is used to determine the blast furnace molten iron temperature control range based on the slag-iron mass ratio and average coke particle size in the second target area and the target temperature difference in the first target area.

[0122] Furthermore, the temperature range determination module 43 is used for:

[0123] Based on the slag-iron mass ratio and average coke particle size in the second target area, as well as the target temperature difference in the first target area, the blast furnace hot metal temperature control range is determined, including: if the average coke particle size is less than 5mm, the target temperature difference is greater than 280℃ and less than 500℃, and the slag-iron mass ratio is greater than 50%, the hot metal temperature control range is determined to be 1505℃ to 1518℃.

[0124] Furthermore, the temperature range determination module 43 is used for:

[0125] Based on the slag-iron mass ratio and average coke particle size in the second target area, as well as the target temperature difference in the first target area, the blast furnace hot metal temperature control range is determined, including: if the average coke particle size is greater than or equal to 5 mm, the target temperature difference is greater than 180℃ and less than 280℃, and the slag-iron mass ratio is less than 35%, the hot metal temperature control range is determined to be 1490℃ to 1502℃.

[0126] Furthermore, the temperature range determination module 43 is used for:

[0127] Based on the slag-iron mass ratio and average coke particle size in the second target area, as well as the target temperature difference in the first target area, the blast furnace hot metal temperature control range is determined, including: if the average coke particle size is less than 5mm, the target temperature difference is greater than 220℃ and less than 350℃, and the slag-iron mass ratio is greater than 35% and less than 50%, the hot metal temperature control range is determined to be 1500℃ to 1510℃.

[0128] Furthermore, the temperature range determination module 43 is used for:

[0129] Determine the slag-iron mass ratio within the second target area, including: determining the slag mass ratio based on the total mass of materials within the second target area and the slag mass within the second target area;

[0130] The proportion of pig iron mass is determined based on the total mass and the pig iron mass within the second target area;

[0131] The slag-iron mass ratio is determined based on the mass ratio of pig iron and slag.

[0132] Furthermore, the temperature range determination module 43 is used for:

[0133] Determine the average particle size of coke within the second target area, including: for multiple coke particles within the second target area, determine the preset particle size range to which each coke particle belongs based on multiple preset particle size ranges and the particle size of the coke.

[0134] For multiple preset particle size ranges, the mass ratio of coke in each preset particle size range is determined based on the mass of each coke particle within the preset particle size range and the mass of multiple coke particles within the second target area.

[0135] For multiple preset granularity ranges, the target granularity corresponding to each preset granularity range is determined based on the threshold of the preset granularity range.

[0136] The average coke particle size in the second target area is determined based on the target particle size of each preset particle size range and the coke mass ratio of each preset particle size range.

[0137] Furthermore, the temperature range determination module 43 is used for:

[0138] The target temperature difference is determined based on the highest temperature in the first target area within the blast furnace hearth and the temperature at the center of the first target area, including: determining the target temperature difference based on the highest temperature in the first target area within a first preset time period and the average temperature at the center within the first preset time period.

[0139] Based on the same inventive concept, this application also provides, for example... Figure 5 An electronic device shown includes:

[0140] Processor 51;

[0141] Memory 52 is used to store processor-executable instructions;

[0142] The processor is configured to perform a blast furnace molten iron temperature control as described above.

[0143] Based on the same inventive concept, this application also provides a non-transitory computer-readable storage medium, which, when the instructions in the storage medium are executed by the processor 51 of an electronic device, enables the electronic device to perform a blast furnace molten iron temperature control as described above.

[0144] Since the electronic device described in this embodiment is an electronic device used to implement the information processing method in the embodiments of this application, those skilled in the art can understand the specific implementation methods and various variations of the electronic device in this embodiment based on the information processing method described in the embodiments of this application. Therefore, how the electronic device implements the method in the embodiments of this application will not be described in detail here. Any electronic device used by those skilled in the art to implement the information processing method in the embodiments of this application falls within the scope of protection of this application.

[0145] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0146] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0147] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0148] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1The steps of the function specified in one or more boxes.

[0149] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0150] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling the temperature of molten iron in a blast furnace, characterized in that, The method includes: After the blast furnace is shut down, the target temperature difference is determined based on the highest temperature of the first target area in the hearth of the blast furnace and the temperature of the center of the first target area. The first target area refers to the area that is parallel to the plane where the bottom of the hearth is located and has the same height as the tuyeres of the blast furnace. Based on the location of the center and the first target distance, a second target area is determined from the first target area, where the first target distance is the radius of the center area of ​​the dead material column of the blast furnace; Based on the slag-to-iron mass ratio and average coke particle size within the second target area, and the target temperature difference within the first target area, the blast furnace molten iron temperature control range is determined, including: If the average particle size of the coke is less than 5 mm, the target temperature difference is greater than 280℃ and less than 500℃, and the slag-iron mass ratio is greater than 50%, the temperature control range of the molten iron is determined to be 1505℃ to 1518℃. If the average particle size of the coke is greater than or equal to 5 mm, the target temperature difference is greater than 180℃ and less than 280℃, and the slag-iron mass ratio is less than 35%, the temperature control range of the molten iron is determined to be 1490℃ to 1502℃. If the average particle size of the coke is less than 5 mm, the target temperature difference is greater than 220℃ and less than 350℃, and the slag-iron mass ratio is greater than 35% and less than 50%, the temperature control range of the molten iron is determined to be 1500℃ to 1510℃. Determining the slag-iron mass ratio within the second target area includes: The slag mass ratio is determined based on the total mass of materials within the second target area and the slag mass within the second target area. The proportion of pig iron mass is determined based on the total mass and the pig iron mass within the second target area; The slag-iron mass ratio is determined based on the sum of the pig iron mass ratio and the slag mass ratio.

2. The method as described in claim 1, characterized in that, Determining the average coke particle size within the second target region includes: For multiple coke particles within the second target area, the preset particle size range to which each coke particle belongs is determined based on multiple preset particle size ranges and the particle size of the coke. For multiple preset particle size ranges, the mass ratio of coke in each preset particle size range is determined based on the mass of each coke particle within the preset particle size range and the mass of multiple coke particles within the second target area. For multiple preset granularity ranges, the target granularity corresponding to each preset granularity range is determined based on the threshold of the preset granularity range. The average coke particle size in the second target area is determined based on the target particle size of each preset particle size range and the coke mass ratio of each preset particle size range.

3. The method as described in claim 1, characterized in that, Determining the target temperature difference based on the highest temperature of the first target region within the hearth of the blast furnace and the temperature of the center of the first target region includes: The target temperature difference is determined based on the highest temperature in the first target area during a first preset time period and the average temperature of the center during the first preset time period.

4. A blast furnace molten iron temperature control device, characterized in that, The device includes: The first area determination module is used to determine the target temperature difference after the blast furnace is shut down, based on the highest temperature of the first target area in the hearth of the blast furnace and the temperature of the center of the first target area. The first target area refers to the area that is parallel to the plane where the bottom of the hearth is located and has the same height as the tuyeres of the blast furnace. The second region determination module is used to determine a second target region from the first target region based on the position of the center and the first target distance, wherein the first target distance is the radius of the center region of the dead material column of the blast furnace; The temperature range determination module is used to determine the molten iron temperature control range of the blast furnace based on the slag-iron mass ratio and average coke particle size in the second target area and the target temperature difference in the first target area. The temperature range determination module is specifically used for: If the average particle size of the coke is less than 5 mm, the target temperature difference is greater than 280℃ and less than 500℃, and the slag-iron mass ratio is greater than 50%, the temperature control range of the molten iron is determined to be 1505℃ to 1518℃. If the average particle size of the coke is greater than or equal to 5 mm, the target temperature difference is greater than 180℃ and less than 280℃, and the slag-iron mass ratio is less than 35%, the temperature control range of the molten iron is determined to be 1490℃ to 1502℃. If the average particle size of the coke is less than 5 mm, the target temperature difference is greater than 220℃ and less than 350℃, and the slag-iron mass ratio is greater than 35% and less than 50%, the temperature control range of the molten iron is determined to be 1500℃ to 1510℃. The slag mass ratio is determined based on the total mass of materials within the second target area and the slag mass within the second target area. The proportion of pig iron mass is determined based on the total mass and the pig iron mass within the second target area; The slag-iron mass ratio is determined based on the sum of the pig iron mass ratio and the slag mass ratio.

5. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute a method for controlling the temperature of molten iron in a blast furnace as described in any one of claims 1 to 3.

6. A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor of an electronic device, enable the electronic device to perform a method for controlling the temperature of molten iron in a blast furnace as described in any one of claims 1 to 3.

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