Blast furnace operation method, blast furnace operation control device, and blast furnace operation control program

Abstract

To keep a layer thickness ratio of an iron ore layer and a coke layer within a specified range regardless of the type of coke.SOLUTION: In a blast furnace operation method, iron ore and coke are charged from a furnace top 12 into a blast furnace 10, and an iron ore layer 20 and a coke layer 22 are alternately formed in layers in the blast furnace 10. In this blast furnace operating method, an amount of coke to be charged into the blast furnace 10 is determined based on the charge volume and bulk density of coke charged into the blast furnace 10, and the determined amount of coke is charged into the blast furnace 10.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a blast furnace operation method, a blast furnace operation control device, and a blast furnace operation control program. [Background technology]

[0002] There is known a blast furnace operation method in which iron ore layers and coke layers are alternately formed in a blast furnace, and hot air and auxiliary fuel, etc. are blown into the blast furnace from a tuyere at the bottom of the blast furnace to heat and reduce the iron ore to produce pig iron (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-136415 [Patent Document 2] Japanese Patent Application Publication No. 6-136417 [Patent Document 3] Japanese Utility Model Application Publication No. 60-28669 Summary of the Invention [Problem to be solved by the invention]

[0004] In general, the amounts of ore and coke charged into the blast furnace from the furnace top are set so that the iron ore layer and the coke layer are formed in the blast furnace with a predetermined layer thickness ratio, thereby ensuring the permeability of the reducing gas rising in the blast furnace.

[0005] However, the bulk density of the coke may vary depending on the type of coke. When the bulk density of the coke varies, the thickness of the coke layer formed in the blast furnace varies even if a predetermined amount of coke is charged into the blast furnace from the furnace top, so that the layer thickness ratio of the iron ore layer and the coke layer may not fall within a predetermined range.

[0006] In consideration of the above, an object of the present invention is to set the layer thickness ratio of the iron ore layer to the coke layer within a predetermined range, regardless of the type of coke. [Means for solving the problem]

[0007] A first aspect of the blast furnace operation method involves charging iron ore and coke into a blast furnace from the top of the furnace and forming alternating layers of iron ore and coke in the blast furnace, the method comprising determining an amount of coke to be charged into a central region of the blast furnace based on a charging volume of the coke to be charged into the central region of the blast furnace and a bulk density of the coke to be charged into the central region of the blast furnace, and charging the determined amount of coke into the central region of the blast furnace.

[0008] According to the above-mentioned blast furnace operation method, iron ore and coke are charged into the blast furnace from the furnace top, and iron ore layers and coke layers are alternately formed in the blast furnace. At this time, the amount of coke charged into the central region of the blast furnace is determined based on the volume of the coke charged into the central region of the blast furnace and the bulk density of the coke charged into the central region of the blast furnace. In other words, in this embodiment, the amount of coke charged into the central region of the blast furnace from the furnace top is adjusted according to the bulk density of the coke.

[0009] Here, if the volume of coke charged into the central region of the blast furnace varies depending on the bulk density of the coke, the layer thickness ratio between the iron ore layer and the coke layer in the central region of the blast furnace also varies.

[0010] Therefore, in this embodiment, as described above, the amount of coke charged from the furnace top to the central region of the blast furnace is adjusted according to the bulk density of the coke. This makes it possible to keep the volume of coke charged from the furnace top to the central region of the blast furnace within a predetermined range regardless of the type of coke. As a result, the layer thickness ratio of the iron ore layer and the coke layer in the central region of the blast furnace can be kept within a predetermined range.

[0011] Therefore, the permeability of the ascending reducing gas is ensured in the central region of the blast furnace, and the blast furnace operation can be stabilized. By ensuring the permeability of the ascending reducing gas in the central region of the blast furnace in this manner, the blast furnace operation can be stabilized more efficiently.

[0012] A second aspect of the blast furnace operation method includes charging iron ore and coke into a blast furnace from the top of the furnace and forming alternating layers of iron ore and coke in the blast furnace, determining an amount of coke to be charged throughout the entire blast furnace based on a charging volume of the coke to be charged throughout the entire blast furnace and a bulk density of the coke to be charged throughout the entire blast furnace, and charging the determined amount of coke throughout the entire blast furnace.

[0013] According to the above-mentioned blast furnace operation method, iron ore and coke are charged into the blast furnace from the furnace top, and iron ore layers and coke layers are alternately formed in the blast furnace. At this time, the amount of coke charged into the entire blast furnace is determined based on the volume of the coke charged into the entire blast furnace and the bulk density of the coke charged into the entire blast furnace. In other words, in this embodiment, the amount of coke charged into the entire blast furnace from the furnace top is adjusted according to the bulk density of the coke.

[0014] Here, if the volume of coke charged throughout the entire blast furnace varies depending on the bulk density of the coke, the layer thickness ratio of the iron ore layer to the coke layer also varies throughout the entire blast furnace.

[0015] Therefore, in this embodiment, as described above, the amount of coke charged from the furnace top to the entire area of ​​the blast furnace is adjusted according to the bulk density of the coke. This makes it possible to keep the volume of coke charged from the furnace top to the entire area of ​​the blast furnace within a predetermined range regardless of the type of coke. As a result, the layer thickness ratio of the iron ore layer to the coke layer can be kept within a predetermined range throughout the entire area of ​​the blast furnace.

[0016] Therefore, the permeability of the ascending reducing gas is ensured throughout the entire blast furnace, thereby stabilizing blast furnace operation.

[0017] A third aspect of the blast furnace operation method includes charging iron ore and coke into a blast furnace from the top of the furnace and forming alternate layers of iron ore and coke in the blast furnace, determining an amount of iron ore to be charged into the blast furnace based on a volume ratio of a standard charging volume of coke to be charged into the entire blast furnace, the volume ratio varying according to a bulk density of the coke to be charged into the entire blast furnace, and charging the determined amount of iron ore into the blast furnace.

[0018] According to the above-mentioned blast furnace operation method, iron ore and coke are charged into the blast furnace from the furnace top, and iron ore layers and coke layers are alternately formed in the blast furnace. At this time, the amount of iron ore charged into the blast furnace is determined based on the volume ratio of the standard charging volume of coke charged into the entire blast furnace to the volume of coke charged into the entire blast furnace, which varies according to the bulk density of the coke charged into the entire blast furnace. In other words, in this embodiment, the amount of iron ore charged into the blast furnace is adjusted according to the bulk density of the coke.

[0019] Here, if the volume of coke charged throughout the entire blast furnace varies depending on the bulk density of the coke, the layer thickness ratio of the iron ore layer to the coke layer also varies throughout the entire blast furnace.

[0020] Therefore, in this embodiment, as described above, the amount of iron ore charged into the blast furnace is adjusted according to the bulk density of the coke. This makes it possible to keep the charging volume ratio of the coke and the iron ore charged from the furnace top to the entire area of ​​the blast furnace within a predetermined range, regardless of the type of coke charged from the furnace top to the entire area of ​​the blast furnace. As a result, the layer thickness ratio of the iron ore layer and the coke layer can be kept within a predetermined range throughout the entire area of ​​the blast furnace.

[0021] Therefore, the permeability of the ascending reducing gas is ensured throughout the entire blast furnace, thereby stabilizing blast furnace operation.

[0022] The blast furnace operation control device of the fourth aspect acquires the bulk density of coke charged from the furnace top to a central region of the blast furnace, determines the amount of coke to be charged to the central region of the blast furnace based on the charging volume of the coke to be charged to the central region of the blast furnace and the bulk density of the coke to be charged to the central region of the blast furnace, and charges the determined amount of coke into the central region of the blast furnace.

[0023] The blast furnace operation control device of the fifth aspect acquires the bulk density of coke to be charged throughout the entire blast furnace from the top of the furnace, determines the amount of coke to be charged throughout the entire blast furnace based on the charging volume of coke to be charged throughout the entire blast furnace and the bulk density of coke to be charged throughout the entire blast furnace, and charges the determined amount of coke throughout the entire blast furnace.

[0024] The blast furnace operation control device of the sixth aspect obtains the type of coke to be charged from the furnace top to a central region of the blast furnace, determines the amount of coke to be charged to the central region of the blast furnace based on the charging volume of the coke to be charged to the central region of the blast furnace and the bulk density of the coke to be charged to the central region of the blast furnace which corresponds to the type of coke to be charged to the central region of the blast furnace, and charges the determined amount of coke into the central region of the blast furnace.

[0025] The blast furnace operation control device of the seventh aspect obtains the type of coke to be charged throughout the entire blast furnace from the top of the furnace, determines the amount of coke to be charged throughout the entire blast furnace based on the volume of coke to be charged throughout the entire blast furnace and the bulk density of the coke to be charged throughout the entire blast furnace which corresponds to the type of coke to be charged throughout the entire blast furnace, and charges the determined amount of coke throughout the entire blast furnace.

[0026] The blast furnace operation control device of the eighth aspect acquires the bulk density of coke charged from the top of the furnace to the entire blast furnace, calculates a volume ratio of the charging volume of coke charged to the entire blast furnace, which varies according to the bulk density of the coke charged to the entire blast furnace, to a standard charging volume of coke charged to the entire blast furnace, determines the amount of iron ore to be charged to the blast furnace based on the calculated volume ratio of the charging volume of coke, and charges the determined amount of iron ore into the blast furnace.

[0027] A blast furnace operation control program according to a ninth aspect acquires the bulk density of coke charged from the top of the blast furnace to a central region of the blast furnace, determines the amount of coke to be charged to the central region of the blast furnace based on the charging volume of the coke to be charged to the central region of the blast furnace and the bulk density of the coke to be charged to the central region of the blast furnace, and charges the determined amount of coke into the central region of the blast furnace.

[0028] A blast furnace operation control program according to a tenth aspect acquires the bulk density of coke charged from the top of the furnace to the entire area of ​​the blast furnace, determines the amount of coke to be charged to the entire area of ​​the blast furnace based on the charging volume of the coke to be charged to the entire area of ​​the blast furnace and the bulk density of the coke to be charged to the entire area of ​​the blast furnace, and charges the determined amount of coke to the entire area of ​​the blast furnace.

[0029] The blast furnace operation control program of an eleventh aspect obtains the type of coke to be charged into a central region of the blast furnace from the top of the furnace, determines the amount of coke to be charged into the central region of the blast furnace based on the volume of coke to be charged into the central region of the blast furnace and the bulk density of the coke to be charged into the central region of the blast furnace according to the type of coke to be charged into the central region of the blast furnace, and charges the determined amount of coke into the central region of the blast furnace.

[0030] The blast furnace operation control program of the twelfth aspect obtains the type of coke to be charged throughout the entire blast furnace from the top of the furnace, determines the amount of coke to be charged throughout the entire blast furnace based on the volume of coke to be charged throughout the entire blast furnace and the bulk density of the coke to be charged throughout the entire blast furnace according to the type of coke to be charged throughout the entire blast furnace, and charges the determined amount of coke throughout the entire blast furnace.

[0031] A blast furnace operation control program according to a thirteenth aspect acquires the bulk density of coke charged from the top of the furnace to the entire blast furnace, calculates a volume ratio of the charging volume of coke charged to the entire blast furnace, which varies according to the bulk density of the coke charged to the entire blast furnace, to a standard charging volume of coke charged to the entire blast furnace, determines the amount of iron ore to be charged to the blast furnace based on the calculated volume ratio of the coke charging volume, and charges the determined amount of iron ore into the blast furnace. Effect of the Invention

[0032] As described above, according to the present invention, the layer thickness ratio of the iron ore layer to the coke layer can be set within a predetermined range regardless of the type of coke. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is a cross-sectional view showing a blast furnace according to a first embodiment. [Diagram 2] FIG. 2 is a functional block diagram of a blast furnace operation control device according to the first embodiment. [Diagram 3] FIG. 4 is a diagram illustrating an example of a coke information table. [Figure 4] FIG. 2 is a cross-sectional view showing an example of an iron ore layer and a coke layer formed in a blast furnace according to the first embodiment. [Diagram 5] FIG. 2 is a hardware configuration diagram of the blast furnace operation control device according to the first embodiment. [Figure 6] 3 is a flowchart showing an example of a blast furnace operation control process according to the first embodiment. [Figure 7]FIG. 2 is a cross-sectional view showing an example of an iron ore layer and a coke layer formed in a blast furnace according to a comparative example. [Figure 8] FIG. 4 is a diagram illustrating an example of a coke information table. [Figure 9] FIG. 5 is a functional block diagram of a blast furnace operation control device according to a second embodiment. [Figure 10] 10 is a flowchart showing an example of a blast furnace operation control process according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] First embodiment First, the first embodiment will be described.

[0035] (blast furnace) FIG. 1 shows a blast furnace 10 according to this embodiment. The blast furnace 10 is a bell-less type blast furnace. Iron ore and coke as raw materials are charged into the blast furnace 10 from the furnace top 12 by a charging device 30 described later. As a result, iron ore layers 20 and coke layers 22 are formed alternately in layers in the blast furnace 10.

[0036] In addition, hot air, auxiliary fuel, and the like are blown into the blast furnace 10 from a tuyere (not shown) provided at the bottom of the blast furnace 10. This causes the auxiliary fuel and coke to burn, generating rising high-temperature gas (reducing gas). The iron ore in the iron ore layer 20 formed in the blast furnace 10 is heated and reduced by this reducing gas as it descends. The iron ore melts as it descends and is discharged as pig iron from a taphole provided in the side wall of the furnace bottom.

[0037] The blast furnace 10 is not limited to a bell-less type blast furnace, but may be a bell type blast furnace.

[0038] (Charging device) As shown in Fig. 1, the charging device 30 is a bell-less type charging device provided at the top of the blast furnace 10. The charging device 30 is not limited to the bell-less type charging device, and may be a bell type charging device.

[0039] The charging device 30 charges iron ore and coke as raw materials into the blast furnace 10 from the furnace top 12, thereby forming iron ore layers 20 and coke layers 22 of a predetermined thickness alternately in the radial direction of the blast furnace 10. The charging device 30 includes a switching chute 34, a pair of furnace top hoppers 36, a storage hopper 38, and a rotating chute 40. A conveying device 32 is also connected to the charging device 30.

[0040] The conveying device 32 is, for example, a belt conveyor, and conveys iron ore and coke as raw materials from a raw material tank (not shown) to a switching chute 34. The switching chute 34 is capable of switching the supply destination of the raw materials between a pair of top hoppers 36. By this switching chute 34, a predetermined amount of iron ore is supplied to one of the top hoppers 36, and a predetermined amount of coke is supplied to the other top hopper 36.

[0041] The iron ore and coke stored in the pair of top hoppers 36 are supplied to a rotating chute 40 via a storage hopper 38. The rotating chute 40 charges the iron ore and coke in layers into the blast furnace 10 while rotating around the central axis of the blast furnace 10. The iron ore and coke are charged at predetermined radial positions of the blast furnace 10 by adjusting the tilt angle (inclination angle) of the rotating chute 40. The operation of the charging device 30 is controlled by a blast furnace operation control device 50 (see FIG. 2).

[0042] Incidentally, one charge refers to the charging of a predetermined amount of iron ore and coke into the blast furnace 10 from the furnace top 12 by the charging device 30 to form a set (two layers in total) of iron ore layer 20 and coke layer 22 throughout the blast furnace 10. At this time, the iron ore may be charged into the blast furnace 10 from the furnace top 12 in one go by the charging device 30, or may be charged in multiple times (multiple batches). Similarly, the coke may be charged into the blast furnace 10 from the furnace top 12 in one go by the charging device 30, or may be charged in multiple times (multiple batches).

[0043] (Blast furnace operation control device) In blast furnace operation, multiple types (multiple brands) of coke are used as a raw material. The particle size distribution of the coke varies depending on, for example, the production conditions or production method. Therefore, the bulk density of the coke may vary depending on the type (brand) of the coke.

[0044] When a predetermined amount of coke is charged into the blast furnace 10 from the furnace top 12 in each charge, if the bulk density of the coke varies, the thickness of the coke layer 22 formed in the blast furnace 10 varies. Therefore, the blast furnace operation control device 50 adjusts the amount of coke charged into the blast furnace 10 from the furnace top 12 based on the bulk density of the coke.

[0045] In addition, the bulk density of iron ore varies little depending on the type, etc. Therefore, in this embodiment, the amount of iron ore charged into the blast furnace 10 from the furnace top 12 is constant and is stored in advance in a memory unit 76 (see FIG. 5) described later.

[0046] As shown in FIG. 2, the blast furnace operation control device 50 functionally comprises a coke information acquisition unit 52, a coke charging amount determination unit 54, and a weighing / transport / charging device control unit 56.

[0047] (Coke Information Acquisition Department) The coke information acquisition unit 52 acquires the type of coke charged into the blast furnace 10 from the furnace top 12. For example, the coke information acquisition unit 52 may acquire the type of coke inputted into an input / output device 78, which will be described later, by a manager of the blast furnace 10. Alternatively, the coke information acquisition unit 52 may acquire the type of coke from, for example, a coke charging schedule table.

[0048] The coke charging schedule table is a table in which the type of coke to be charged into the blast furnace 10 is determined for each coke charge, and is stored in advance in, for example, the storage unit 76 described later.

[0049] The bulk density of the coke is measured, for example, by the measurement method described in JIS K2151:2004, but the method for measuring the bulk density can be changed as appropriate.

[0050] The coke information acquiring unit 52 acquires the bulk density of the coke corresponding to the type of coke from the coke information table 60. For example, as shown in Fig. 3, the coke information table 60 stores in advance the types of coke and the bulk densities of the coke corresponding to the types of coke. This coke information table 60 is stored in advance in a storage unit 76, which will be described later.

[0051] (Coke charging amount determination unit) The coke charging amount determination unit 54 determines the volume [m 3 ] (hereinafter referred to as "charging volume"), and the bulk density of the coke [t / m 3 ], the amount of coke [t] to be charged into the blast furnace 10 from the furnace top 12 is determined.

[0052] Specifically, the coke charging amount determination unit 54 calculates the coke charging amount (= coke charging volume × coke bulk density) by multiplying a predetermined coke charging volume by the coke bulk density acquired by the coke information acquisition unit 52.

[0053] The charging volume of the coke is determined based on the thickness of the coke layer 22 to be formed in the blast furnace 10 (hereinafter referred to as the “target layer thickness”) and the formation area of ​​the coke layer 22 .

[0054] For example, Fig. 4 shows an example of target layer thicknesses t1, t2 of the iron ore layer 20 and the coke layer 22 formed in the blast furnace 10. Note that Fig. 4 shows a cross section from the central axis of the blast furnace 10 to one of the furnace walls of the blast furnace 10.

[0055] 4, the target layer thicknesses t1, t2 of the iron ore layer 20 and the coke layer 22 vary in the radial direction of the blast furnace 10. In addition, the target layer thicknesses t1, t2 of the iron ore layer 20 and the coke layer 22 are constant in the circumferential direction of the blast furnace 10.

[0056] The formation area of ​​the coke layer 22 is the planar area in the blast furnace 10 where the coke layer 22 is formed. The charging volume of the coke is determined based on the formation area of ​​the coke layer 22 and a target layer thickness t2 of the coke layer 22. The charging volume of the coke is stored in advance in a storage unit 76, which will be described later.

[0057] In the example shown in FIG. 4, in the central region 10A of the blast furnace 10, the target layer thickness ratio of the iron ore layer 20 and the coke layer 22 (= target layer thickness t1 of the iron ore layer 20 / total target layer thicknesses of the iron ore layer 20 and the coke layer 22 (t1+t2)) is set lower than the target layer thickness ratios of the peripheral regions 10B other than the central region 10A. As a result, in the central region 10A of the blast furnace 10, the ventilation resistance of the ascending reducing gas is made smaller than that of the peripheral regions 10B of the blast furnace 10. Furthermore, in this embodiment, in the central region 10A of the blast furnace 10, a region where the iron ore layer 20 is not formed on the coke layer 22 is formed.

[0058] In addition, the target layer thickness ratio of the iron ore layer 20 and the coke layer 22 varies in the radial direction of the blast furnace 10, and is therefore set according to the radial position of the blast furnace 10. In addition, the central region 10A in the blast furnace 10 means, for example, a region within 10 to 20% of the radius of the blast furnace 10 from the central axis of the blast furnace 10.

[0059] (Weighing, transport and charging device control section) The weighing / transporting / charging device control unit 56 controls the operation of a weighing device (not shown) to weigh a predetermined amount of iron ore or coke from a raw material bin. The weighing / transporting / charging device control unit 56 also controls the operation of the transport device 32 to transport the weighed iron ore or coke to the charging device 30 at the furnace top 12. The weighing / transporting / charging device control unit 56 also controls the operation of the charging device 30 to charge a predetermined amount of iron ore and coke from the furnace top 12 into the blast furnace 10 for each charge.

[0060] At this time, the weighing / transporting / charging device control unit 56 controls the operation of the charging device 30 so that a predetermined amount of iron ore is charged into the blast furnace 10 from the furnace top 12. In addition, the weighing / transporting / charging device control unit 56 controls the operation of the charging device 30 so that the amount of coke determined by the coke charging amount determination unit 54 is charged into the blast furnace 10 from the furnace top 12.

[0061] (Hardware configuration of blast furnace operation control device) Next, the hardware configuration of the blast furnace operation control device 50 will be described.

[0062] The blast furnace operation control device 50 is realized, for example, by a computer 70 shown in Fig. 5. The computer 70 includes a CPU (Central Processing Unit) 72, a memory 74 as a temporary storage area, and a non-volatile storage unit 76. The computer 70 also includes an input / output device 78. The CPU 72, the memory 74, the storage unit 76, and the input / output device 78 are connected to each other via a bus 79. The CPU 72 is an example of a control unit.

[0063] The storage unit 76 is realized by, for example, a hard disk drive (HDD), a solid state drive (SSD), a flash memory, etc. A blast furnace operation control program for causing the computer 70 to function as the blast furnace operation control device 50 is stored in advance in the storage unit 76 as a recording medium.

[0064] The blast furnace operation control program includes a coke information acquisition step, a coke charging amount determination step, and a charging step. The storage unit 76 stores the amount of iron ore charged, the volume of coke charged, and a coke information table 60 in advance.

[0065] The CPU 72 reads out the blast furnace operation control program from the storage unit 76, expands it in the memory 74, and sequentially executes a coke information acquisition step, a coke charging amount determination step, and a charging step included in the blast furnace operation control program. The CPU 72 operates as the coke information acquisition unit 52 by executing the coke charging amount determination step. The CPU 72 also operates as the coke charging amount determination unit 54 by executing the coke charging amount determination step. Furthermore, the CPU 72 operates as the weighing / transporting / charging device control unit 56 by executing the charging step.

[0066] Further, the CPU 72 reads out the coke information table 60, the charged volume of coke, and the charged amount of iron ore from the storage unit 76, and develops them in the memory 74. This enables the computer 70, which executes the blast furnace operation control program, to function as the blast furnace operation control device 50.

[0067] The CPU 72 that executes the program is hardware. The functions realized by the blast furnace operation control program can also be realized by, for example, a semiconductor integrated circuit, more specifically, an ASIC (Application Specific Integrated Circuit) or the like.

[0068] (Blast furnace operation method) Next, an example of a blast furnace operation method will be described while explaining the operation of the blast furnace operation control device 50.

[0069] When charging coke into the blast furnace 10 from the furnace top 12, the blast furnace operation control device 50 executes a blast furnace operation process shown in FIG. 6. This blast furnace operation process is executed, for example, for each charge. The blast furnace operation process is an example of a blast furnace operation method.

[0070] As shown in FIG. 6, first, in step S10, the coke information acquisition unit 52 acquires, for example, the type of coke input to the input / output device 78.

[0071] Next, in step S12, the coke information acquisition unit 52 acquires, from the coke information table 60, the bulk density of the coke corresponding to the type of coke.

[0072] Next, in step S14, the coke charging amount determination unit 54 determines the amount of coke to be charged. Specifically, the coke charging amount determination unit 54 multiplies a predetermined charging volume of the coke by the bulk density of the coke acquired by the coke information acquisition unit 52 to calculate the amount of the coke to be charged.

[0073] Next, in step S16, the weighing / transporting / charging device control unit 56 controls the operation of a weighing device (not shown) to weigh a predetermined amount of coke or iron ore from the raw material bin. The weighing / transporting / charging device control unit 56 also controls the operation of the transport device 32 to transport the weighed coke or iron ore to the charging device 30 at the furnace top 12.

[0074] Furthermore, the weighing / transporting / charging device control unit 56 operates the charging device 30 to charge the amount of coke determined by the coke charging amount determination unit 54 into the blast furnace 10 from the furnace top 12. Furthermore, the weighing / transporting / charging device control unit 56 operates the charging device 30 to charge a predetermined amount of iron ore into the blast furnace 10 from the furnace top 12. Then, the blast furnace operation process is completed.

[0075] The blast furnace operation control device 50 repeats the above procedure, causing the charging device 30 to charge coke and iron ore into the blast furnace 10 from the furnace top 12, thereby forming alternating layers of iron ore 20 and coke layers 22 inside the blast furnace 10.

[0076] (effect) Next, the effects of the first embodiment will be described.

[0077] According to this embodiment, iron ore and coke are charged into the blast furnace 10 from the furnace top 12, and iron ore layers 20 and coke layers 22 are formed alternately in the blast furnace 10 in the form of layers.

[0078] Here, in this embodiment, as described above, multiple types (multiple brands) of coke are used. However, when the type of coke is changed, the bulk density of the coke may vary. If the bulk density of the coke varies, even if a predetermined amount of coke is charged into the blast furnace 10 from the furnace top 12, the thickness of the coke layer 22 formed in the blast furnace 10 may vary, and the layer thickness ratio of the iron ore layer 20 and the coke layer 22 may not fall within a predetermined range.

[0079] For example, in a comparative example shown in Fig. 7, the volume of coke charged into the blast furnace 10 is reduced with fluctuations in the bulk density of the coke. In this comparative example, in the central region 10A of the blast furnace 10, the layer thickness ratio of the iron ore layer 20 and the coke layer 22 (=layer thickness of the iron ore layer 20 / total layer thickness of the iron ore layer 20 and the coke layer 22 (layer thickness for one charge)) is greater than the target layer thickness ratio (see Fig. 4). In this case, the permeability is reduced in the central region 10A of the blast furnace 10, and the flow rate of the ascending reducing gas is reduced.

[0080] As a countermeasure to this, in this embodiment, the amount of coke charged into the blast furnace 10 from the furnace top 12 is determined based on the volume of the coke charged into the blast furnace 10 and the bulk density of the coke. That is, in this embodiment, the amount of coke charged into the blast furnace 10 from the furnace top 12 is adjusted according to the bulk density of the coke.

[0081] This makes it possible to keep the charging volume of the coke charged from the furnace top 12 into the blast furnace 10 within a predetermined range, regardless of the type of coke charged from the furnace top 12 into the blast furnace 10. As a result, for example, as shown in Fig. 4, the thickness of the coke layer 22 formed in the blast furnace 10 can be made to approach the target layer thickness t2.

[0082] On the other hand, the bulk density of iron ore is small. Therefore, by charging a predetermined amount of iron ore into the blast furnace 10 from the furnace top 12, the thickness of the iron ore layer 20 formed in the blast furnace 10 can be made close to the target thickness t1, as shown in FIG.

[0083] Therefore, in the present embodiment, the layer thickness ratio of the iron ore layer 20 and the coke layer 22 formed in the blast furnace 10 can be made close to the target layer thickness ratio. As a result, a predetermined gas permeability is ensured in the blast furnace 10, and the blast furnace operation can be stabilized.

[0084] In particular, in order to stabilize the blast furnace operation, it is desirable to increase the permeability of the central region 10A in the blast furnace 10 and increase the flow rate of the reducing gas rising in the central region 10A. Therefore, it is desirable to apply this embodiment when charging coke at least in the central region 10A among the entire region (the central region 10A and the peripheral region 10B) in the blast furnace 10.

[0085] In this case, the blast furnace operation control device 50 determines the amount of coke to be charged into the central region 10A of the blast furnace 10, for example, based on the volume of the coke to be charged into the central region 10A of the blast furnace 10 and the bulk density of the coke charged into the central region 10A. Then, the blast furnace operation control device 50 causes the charging device 30 to charge the determined amount of coke into the blast furnace 10. This makes it possible to more efficiently stabilize the blast furnace operation.

[0086] (Modification of the first embodiment) Next, a modification of the first embodiment will be described.

[0087] In the above-described first embodiment, the coke information acquiring unit 52 acquired the type of coke charged into the blast furnace 10 from the furnace top 12. However, the coke information acquiring unit 52 may acquire, for example, the bulk density of the coke inputted into the input / output device 78 by the manager of the blast furnace 10.

[0088] Also, for example, the coke bulk density corresponding to the type of coke may be stored in advance in the coke charging schedule table. In this case, the coke information acquiring unit 52 acquires the coke bulk density corresponding to the type of coke from the coke charging schedule table.

[0089] In the first embodiment, the coke charging amount determination unit 54 determines the coke charging amount based on the predetermined coke charging volume and the bulk density of the coke acquired by the coke information acquisition unit 52.

[0090] 8, for example, the coke charging amount corresponding to the type or bulk density of the coke may be stored in advance in the coke information table 62. In this case, the coke charging amount determination unit 54 determines the amount of coke to be charged by acquiring, from the coke information table 62, the amount of coke to be charged that corresponds to the type or bulk density of the coke acquired by the coke information acquisition unit 52.

[0091] Furthermore, the blast furnace operation control device 50 may determine the amount of coke to be charged into the blast furnace 10 for each charge based on the volume and bulk density of the coke to be charged into the blast furnace 10, and charge the determined amount of coke into the blast furnace 10. Furthermore, when coke is charged into the blast furnace 10 in multiple batches in one charge, the blast furnace operation control device 50 may determine the amount of coke to be charged into the blast furnace 10 for each batch based on the volume and bulk density of the coke to be charged into the blast furnace 10, and charge the determined amount of coke into the blast furnace 10.

[0092] In addition, the coke in this embodiment means the coke charged in the central region 10A of the blast furnace 10 when calculating the amount of coke charged in the central region 10A of the blast furnace 10, and means the coke charged in the entire region of the blast furnace 10 when calculating the amount of coke charged in the entire region of the blast furnace 10. In addition, the iron ore in this embodiment means the iron ore charged in the entire region of the blast furnace 10 (in FIG. 4, excluding a part of the central region 10A).

[0093] (Example) Next, an example of the first embodiment will be described.

[0094] First, an embodiment in which coke is charged into the central region 10A of the blast furnace 10 will be described.

[0095] Table 1 shows the amount, bulk density, and volume (charged volume) of coke charged in the central region 10A of the blast furnace 10 for the target value, the comparative example, and the example. Table 1 also shows the relative air flow resistance in the blast furnace 10 for the target value, the comparative example, and the example.

[0096] In Table 1, the target values ​​for the coke charging amount, bulk density, and volume are the coke charging amount, bulk density, and volume when the thickness of the coke layer 22 formed in the central region 10A of the blast furnace 10 reaches a predetermined value (target layer thickness).

[0097] In the comparative example and the example, the bulk density of the coke is larger than the target value. Here, in the comparative example, the same amount of coke as the target value was charged into the central region 10A of the blast furnace 10 without taking the bulk density of the coke into consideration.

[0098] On the other hand, in the examples, the amount of coke to be charged into the central region 10A of the blast furnace 10 was determined based on the bulk density of the coke and the target value of the volume of the coke (charging volume), and the determined amount of coke was charged into the central region 10A of the blast furnace 10. Then, in the examples and comparative examples, the relative air flow resistance in the blast furnace 10 was measured. A predetermined amount of iron ore was charged into the central region 10A of the blast furnace 10.

[0099] The relative airflow resistance was calculated based on the pressure difference inside the blast furnace 10 detected by multiple pressure sensors installed inside the blast furnace 10. The relative airflow resistances of the comparative example and the example are expressed as a relative ratio when the airflow resistance inside the blast furnace 10 is set to 1 (1.00) when the thickness of the coke layer 22 formed in the central region 10A inside the blast furnace 10 is set to a predetermined value (target layer thickness). As the relative airflow resistance increases, the permeability decreases. [Table 1]

[0100] As can be seen from Table 1, in the comparative example, the relative airflow resistance in the blast furnace 10 was 1.20, and the airflow resistance in the blast furnace 10 increased. On the other hand, in the example, the relative airflow resistance in the blast furnace 10 was 1.03, which was close to 1. From this, it is estimated that in the example, the layer thickness ratio of the iron ore layer 20 and the coke layer 22 in the central region 10A of the blast furnace 10 was close to the target layer thickness ratio.

[0101] Next, an embodiment in which coke is charged into the entire area (the central area 10A and the peripheral area 10B) of the blast furnace 10 will be described.

[0102] Table 2 shows the amount, bulk density, and volume (charged volume) of coke charged in the entire area (central area 10A and peripheral area 10B) of the blast furnace 10 for the target value, the comparative example, and the example. Table 2 also shows the relative air flow resistance in the blast furnace 10 for the target value, the comparative example, and the example.

[0103] In Table 2, the target values ​​for the coke charging amount, bulk density, and volume are the coke charging amount, bulk density, and volume when the thickness of the coke layer 22 formed throughout the entire blast furnace 10 reaches a predetermined value (target layer thickness).

[0104] In the comparative example and the embodiment, the bulk density of the coke is larger than the target value. Here, in the comparative example, the same amount of coke as the target value was charged into the entire area of ​​the blast furnace 10 without taking the bulk density of the coke into consideration.

[0105] On the other hand, in the examples, the amount of coke to be charged into the entire area of ​​the blast furnace 10 was determined based on the bulk density of the coke and the target value of the volume of the coke (charging volume), and the determined amount of coke was charged into the entire area of ​​the blast furnace 10. Then, in the examples and comparative examples, the relative air flow resistance in the blast furnace 10 was measured. A predetermined amount of iron ore was charged into the blast furnace 10. [Table 2]

[0106] As can be seen from Table 2, in the comparative example, the relative airflow resistance in the blast furnace 10 was 1.21, and the airflow resistance in the blast furnace 10 increased. On the other hand, in the example, the relative airflow resistance in the blast furnace 10 was 1.02, which was close to 1. From this, it is estimated that in the example, the layer thickness ratio of the iron ore layer 20 and the coke layer 22 was close to the target layer thickness ratio throughout the entire area of ​​the blast furnace 10.

[0107] Second Embodiment Next, a second embodiment will be described. In the second embodiment, the same reference numerals will be used to designate the same members as in the first embodiment, and the description thereof will be omitted as appropriate.

[0108] The blast furnace operation control device 80 of the second embodiment adjusts the amount of iron ore charged in accordance with the type of coke, i.e., fluctuations in the bulk density of the coke, and reduces fluctuations in the layer thickness ratio of the iron ore layer 20 and the coke layer 22 throughout the entire blast furnace 10.

[0109] Specifically, in this embodiment, the amount of coke charged from the furnace top 12 to the entire interior of the blast furnace 10 is constant. In this case, if the bulk density of the coke varies, the thickness of the coke layer 22 formed throughout the entire interior of the blast furnace 10 varies. As a result, the layer thickness ratio of the iron ore layer 20 and the coke layer 22 varies throughout the entire interior of the blast furnace 10.

[0110] Therefore, the blast furnace operation control device 80 adjusts the charging volume of iron ore charged from the furnace top 12 into the blast furnace 10 in accordance with the thickness of the coke layer 22 formed throughout the blast furnace 10, i.e., the variation in the charging volume of coke charged from the furnace top 12 into the entire blast furnace 10. Then, based on the charging volume of iron ore, the charging amount of iron ore charged from the furnace top 12 into the blast furnace 10 is adjusted, thereby reducing the variation in the layer thickness ratio of the iron ore layer 20 and the coke layer 22 throughout the blast furnace 10.

[0111] (Blast furnace operation control device) As shown in FIG. 9, the blast furnace operation control device 80 functionally comprises a coke information acquisition unit 52, an iron ore charging amount determination unit 84, and a weighing / transport / charging device control unit 86.

[0112] (Iron ore charge amount determination unit) The iron ore charging amount determination unit 84 determines the charging volume of iron ore to be charged into the blast furnace 10 from the furnace top 12 based on the charging volume of coke, which varies depending on the bulk density of the coke charged throughout the blast furnace 10.

[0113] That is, the iron ore charging amount determination unit 84 first determines the amount of coke charged [t] and the bulk density of the coke [t / m 3 ], the charging volume [m 3 ] is calculated.

[0114] Specifically, the iron ore loading amount determination unit 84 calculates the coke loading volume (=coke loading amount / coke bulk density) by dividing a predetermined coke loading amount by the coke bulk density acquired by the coke information acquisition unit 52.

[0115] The amount of coke charged is calculated by multiplying a reference coke charging volume (hereinafter referred to as "reference charging volume") by a reference coke bulk density (hereinafter referred to as "reference bulk density") (coke charging amount = reference coke charging volume x reference bulk density). The reference coke charging volume is determined based on a target layer thickness t2 of the coke layer 22 to be formed throughout the entire blast furnace 10 and the formation area, as shown in Fig. 4, for example, and is stored in advance in the memory unit 76.

[0116] Next, the iron ore charging amount determination unit 84 calculates the volume ratio of the charging volume of the coke to the reference charging volume of the coke (=charging volume of the coke / reference charging volume of the coke).

[0117] Next, the iron ore charging amount determination unit 84 calculates the charging volume of iron ore (=standard charging volume of iron ore × volume ratio of coke) by multiplying the standard charging volume of iron ore (hereinafter referred to as the "standard charging volume") by the calculated volume ratio of coke.

[0118] The standard charging volume of iron ore is determined based on the target layer thickness t1 of the iron ore layer 20 throughout the entire area of ​​the blast furnace 10 and the formation area of ​​the iron ore layer 20, for example, as shown in FIG. 4, and is stored in advance in the memory unit 76.

[0119] Next, the iron ore charging amount determination unit 84 calculates the amount of iron ore to be charged (= charging volume of iron ore × bulk density of iron ore) by multiplying the charging volume of iron ore by a predetermined bulk density of iron ore. The bulk density of iron ore is stored in the memory unit 76 in advance.

[0120] (Weighing, transport and charging device control section) The weighing / transporting / charging device control unit 86 controls the operation of a weighing device (not shown) to weigh a predetermined amount of iron ore or coke from a raw material bin. The weighing / transporting / charging device control unit 86 also controls the operation of the transport device 32 to transport the weighed iron ore or coke to the charging device 30 at the furnace top 12. The weighing / transporting / charging device control unit 86 also controls the operation of the charging device 30 to charge a predetermined amount of iron ore and coke from the furnace top 12 into the blast furnace 10 for each charge.

[0121] At this time, the weighing / transporting / charging device control unit 86 controls the operation of the charging device 30 so that the charging amount of iron ore determined by the iron ore charging amount determination unit 84 is charged into the blast furnace 10 from the furnace top 12. In addition, the weighing / transporting / charging device control unit 86 controls the operation of the charging device 30 so that a predetermined charging amount of coke is charged into the blast furnace 10 from the furnace top 12.

[0122] (Hardware configuration of blast furnace operation control device) Next, the hardware configuration of the blast furnace operation control device 80 will be described.

[0123] 5, a storage unit 76 serving as a recording medium stores a blast furnace operation control program for causing the computer 70 to function as a blast furnace operation control device 80. The blast furnace operation control program includes a coke information acquisition process, an iron ore charging amount determination process, and a charging process. The storage unit 76 also stores a standard charging volume of coke, a standard bulk density of coke, a standard charging volume of iron ore, and a bulk density of iron ore.

[0124] The CPU 72 reads out the blast furnace operation control program from the storage unit 76, develops it in the memory 74, and sequentially executes a coke information acquisition process, an iron ore charging amount determination process, and a charging device control process contained in the blast furnace operation control program.

[0125] The CPU 72 operates as the coke information acquiring unit 52 by executing the coke information acquiring step. The CPU 72 also operates as the iron ore charging amount determining unit 84 by executing the iron ore charging amount determining step. The CPU 72 also operates as the weighing / transporting / charging device control unit 86 by executing the charging step.

[0126] Further, the CPU 72 reads out the coke information table 60, the standard charging volume of the coke, the standard bulk density of the coke, the standard charging volume of the iron ore, and the bulk density of the iron ore from the storage unit 76, and loads them in the memory 74. This enables the computer 70, which has executed the blast furnace operation control program, to function as a blast furnace operation control device 80.

[0127] (Blast furnace operation method) Next, an example of a blast furnace operation method will be described while explaining the operation of the blast furnace operation control device 80.

[0128] When iron ore is charged into the blast furnace 10 from the furnace top 12, the blast furnace operation control device 80 executes a blast furnace operation process shown in FIG. 10. This blast furnace operation process is executed, for example, for each charge. The blast furnace operation process is an example of a blast furnace operation method.

[0129] As shown in FIG. 10, first, in step S20, the coke information acquisition unit 52 acquires, for example, the type of coke input to the input / output device 78.

[0130] Next, in step S22, the coke information acquisition unit 52 acquires the bulk density of the coke corresponding to the type of coke from the coke information table 60 (see FIG. 3).

[0131] Next, in step S24, the iron ore charging amount determination unit 84 calculates the charging volume of the coke. Specifically, the iron ore charging amount determination unit 84 calculates the charging volume of the coke by dividing a predetermined charging amount of the coke by the bulk density of the coke acquired by the coke information acquisition unit 52.

[0132] Next, in step S26, the iron ore charging amount determination unit 84 calculates the volume ratio of coke by dividing the calculated charging volume of coke by a predetermined standard charging volume of coke.

[0133] Next, in step S28, the iron ore charging amount determination unit 84 determines the amount of iron ore to be charged. Specifically, the iron ore charging amount determination unit 84 first calculates the charging volume of iron ore by multiplying a predetermined reference charging volume of iron ore by the calculated volume ratio of coke. Next, the iron ore charging amount determination unit 84 calculates the charging amount of iron ore by multiplying the calculated charging volume of iron ore by a predetermined bulk density of iron ore.

[0134] Next, in step S30, the weighing / transporting / charging device control unit 86 controls the operation of a weighing device (not shown) to weigh a predetermined amount of iron ore or coke from a raw material bin. The weighing / transporting / charging device control unit 86 also controls the operation of a transport device (not shown) to transport the weighed iron ore or coke to the charging device 30 at the furnace top 12.

[0135] Furthermore, the weighing / transporting / charging device control unit 86 operates the charging device 30 to charge the amount of coke determined by the iron ore charging amount determination unit 84 into the blast furnace 10 from the furnace top 12. Next, the weighing / transporting / charging device control unit 86 operates the charging device 30 to charge a predetermined amount of coke into the blast furnace 10 from the furnace top 12. Then, the blast furnace operation process is completed.

[0136] The blast furnace operation control device 80 repeats the above procedure, causing the charging device 30 to charge coke and iron ore into the blast furnace 10 from the furnace top 12, thereby forming alternating layers of iron ore 20 and coke layers 22 inside the blast furnace 10.

[0137] (effect) Next, the effects of the second embodiment will be described.

[0138] According to this embodiment, iron ore and coke are charged into the blast furnace 10 from the furnace top 12, and iron ore layers 20 and coke layers 22 are alternately formed in layers in the blast furnace 10. At this time, the amount of iron ore charged into the blast furnace 10 is determined based on the volume ratio of the charging volume of coke charged into the entire area of ​​the blast furnace 10, which varies according to the bulk density of the coke, to the standard charging volume of coke charged into the entire area of ​​the blast furnace 10. That is, in this embodiment, the charging amount of iron ore charged into the blast furnace 10 is adjusted according to the bulk density of the coke.

[0139] This makes it possible to keep the charging volume ratio of the coke and iron ore charged from the furnace top 12 into the blast furnace 10 within a predetermined range, regardless of the type of coke charged from the furnace top 12 into the blast furnace 10. Therefore, the layer thickness ratio of the iron ore layer 20 and the coke layer 22 can be made close to the target layer thickness ratio throughout the entire blast furnace 10. As a result, a predetermined gas permeability is ensured throughout the entire blast furnace 10, and the gas flow distribution of the reducing gas is stabilized.

[0140] In particular, by stabilizing the gas flow distribution of the reducing gas in the central region 10A of the blast furnace 10, the blast furnace operation can be stabilized more efficiently.

[0141] (Modification of the second embodiment) Next, a modification of the second embodiment will be described.

[0142] In the second embodiment, the coke information acquiring unit 52 acquired the type of coke charged into the blast furnace 10 from the furnace top 12. However, the coke information acquiring unit 52 may acquire, for example, the bulk density of the coke inputted into the input / output device 78 by the manager of the blast furnace 10.

[0143] Also, for example, the coke bulk density corresponding to the type of coke may be stored in advance in the coke charging schedule table. In this case, the coke information acquiring unit 52 acquires the coke bulk density corresponding to the type of coke from the coke charging schedule table.

[0144] In the second embodiment, the iron ore charging amount determination unit 84 calculates the amount of iron ore to be charged based on the bulk density of the coke acquired by the coke information acquisition unit 52 and the like.

[0145] However, for example, the coke information table may store in advance the amount of iron ore charged corresponding to the type or bulk density of the coke. In this case, the iron ore charging amount determination unit 84 determines the amount of iron ore charged by acquiring the amount of iron ore charged corresponding to the type or bulk density of the coke acquired by the coke information acquisition unit 52 from the coke information table.

[0146] The blast furnace operation control device 80 may determine the amount of iron ore to be charged into the blast furnace 10 for each charge based on the volume ratio of the charging volume of coke that varies according to the bulk density of the coke to the standard charging volume of the coke charged into the blast furnace 10, and charge the determined amount of iron ore into the blast furnace 10. When iron ore is charged into the blast furnace 10 in multiple batches in one charge, the blast furnace operation control device 80 may determine the amount of iron ore to be charged into the blast furnace 10 for each batch based on the volume ratio of the charging volume of coke that varies according to the bulk density of the coke, and charge the determined amount of iron ore into the blast furnace 10.

[0147] In addition, the coke in this embodiment means the coke charged in the entire region of the blast furnace 10. In addition, the iron ore in this embodiment means the iron ore charged in the entire region of the blast furnace 10 (in FIG. 4, excluding a part of the central region 10A).

[0148] (Example) Next, an example of the second embodiment will be described.

[0149] Table 3 shows the amounts, bulk densities, and volumes (charged volumes) of the coke and iron ore charged into the blast furnace 10 for the target values, comparative examples, and examples. Table 3 also shows the relative air flow resistance in the blast furnace 10 for the target values, comparative examples, and examples.

[0150] In Table 3, the target values ​​of the charging amount, bulk density, and volume of the coke are the charging amount, bulk density, and volume of the coke when the thickness of the coke layer 22 becomes a predetermined value (target layer thickness) in the entire area of ​​the blast furnace 10. Similarly, the target values ​​of the charging amount, bulk density, and volume of the iron ore are the charging amount, bulk density, and volume of the iron ore when the thickness of the iron ore layer 20 becomes a predetermined value (target layer thickness) in the entire area of ​​the blast furnace 10.

[0151] In the comparative example and the example, the bulk density of the coke is larger than the target value. Also, in the comparative example and the example, the same amount of coke as the target value was charged into the entire area of ​​the blast furnace 10.

[0152] Here, in the comparative example, the same amount of iron ore as the target value was charged into the entire area of ​​the blast furnace 10 without taking the bulk density of the coke into consideration.

[0153] On the other hand, in the examples, the amount of iron ore charged into the blast furnace 10 was determined based on the volume ratio of the coke charged to the target value (reference charging volume) of the coke charged throughout the entire area of ​​the blast furnace 10, and the determined amount of iron ore was charged into the blast furnace 10. Then, in the examples and comparative examples, the relative air flow resistance in the blast furnace 10 was measured.

[0154] [Table 3]

[0155] As can be seen from Table 3, in the comparative example, the relative airflow resistance in the blast furnace 10 was 1.20, and the airflow resistance in the blast furnace 10 increased. On the other hand, in the example, the relative airflow resistance in the blast furnace 10 was 1.05, which was close to 1. From this, it is estimated that in the example, the layer thickness ratio of the iron ore layer 20 and the coke layer 22 was close to the target layer thickness ratio throughout the entire area of ​​the blast furnace 10.

[0156] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0157] 10 blast furnace 10A center area 12 Hearth Top 20 Iron Ore Layer 22 Coke layer 50 Blast furnace operation control device 72 CPU (an example of a control unit) 80 Blast furnace operation control device

Claims

1. A method for operating a blast furnace, comprising charging iron ore and coke into a blast furnace from a furnace top and forming iron ore layers and coke layers alternately in the blast furnace, Determine a charge weight of the coke to be charged in the central region of the blast furnace based on a charge volume of the coke to be charged in the central region of the blast furnace and a bulk density of the coke to be charged in the central region of the blast furnace; Charging the determined charge weight of coke into a central region within the blast furnace. Blast furnace operating methods.

2. A method for obtaining a bulk density of coke charged from the top of a blast furnace to a central region of the furnace, Determine a charge weight of the coke to be charged in the central region of the blast furnace based on a charge volume of the coke to be charged in the central region of the blast furnace and a bulk density of the coke to be charged in the central region of the blast furnace; Charging the determined charge weight of coke into a central region within the blast furnace. A blast furnace operation control device including a control unit that executes processing.

3. Obtaining the type of coke charged from the furnace top to the central region of the blast furnace, Determine a charging weight of the coke to be charged in the central region of the blast furnace based on a charging volume of the coke to be charged in the central region of the blast furnace and a bulk density of the coke to be charged in the central region of the blast furnace according to a type of the coke to be charged in the central region of the blast furnace; Charging the determined charge weight of coke into a central region within the blast furnace. A blast furnace operation control device including a control unit that executes processing.

4. A method for obtaining a bulk density of coke charged from the top of a blast furnace to a central region of the furnace, Determine a charge weight of the coke to be charged in the central region of the blast furnace based on a charge volume of the coke to be charged in the central region of the blast furnace and a bulk density of the coke to be charged in the central region of the blast furnace; Charging the determined charge weight of coke into a central region within the blast furnace. A blast furnace operation control program that causes a computer to execute processing.

5. Obtaining the type of coke charged from the top of the blast furnace to the central region of the blast furnace, Determine a charging weight of the coke to be charged in the central region of the blast furnace based on a charging volume of the coke to be charged in the central region of the blast furnace and a bulk density of the coke to be charged in the central region of the blast furnace according to a type of the coke to be charged in the central region of the blast furnace; Charging the determined charge weight of coke into a central region within the blast furnace. A blast furnace operation control program that causes a computer to execute processing.

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