Vertical carbonization furnace, blast furnace raw material manufacturing equipment, and blast furnace raw material manufacturing method

Abstract

To provide a vertical retort and a method for manufacturing blast furnace raw materials that improve the distribution of a charge within the furnace of the vertical retort, particularly the distribution of powder contained in the charge.SOLUTION: The present invention provides a vertical retort for manufacturing blast furnace raw materials by dry-distilling a charge containing carbonaceous material. The vertical retort comprises a retort body inside which the charge is accumulated; a charge chute that facilitates the transfer of the charge to the retort body; and a stirrer that is provided inside the retort body and stirs the charge accumulated inside the retort body.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vertical carbonization furnace for producing coke, an apparatus for producing raw materials for a blast furnace, and a method for producing raw materials for a blast furnace. [Background technology]

[0002] In recent years, the steel industry has been required to reduce CO2 gas emissions in light of global warming. Therefore, reducing the use of fossil fuels is an urgent task. In the steel industry, molten iron is produced in blast furnaces by reducing iron ore with carbon (coke produced by carbonizing coal in a coke oven). To reduce the coke consumption, technology is being developed to use ferro-coke as a blast furnace feedstock. Ferro-coke is made by mixing a certain amount of iron ore with coal, agglomerating it, and then carbonizing it to disperse fine metallic iron particles in the coke. This is a molded coke whose reactivity is enhanced by the catalytic action of the metallic iron.

[0003] A method using a vertical carbonization furnace has been proposed as a method for carbonizing ferro-coke. Patent Document 1 discloses a vertical carbonization furnace having a carbonization zone in the upper part and a cooling zone in the lower part. The method for producing ferro-coke in a vertical carbonization furnace includes a charging step of charging briquettes composed of a carbon-containing material and an iron-containing material into the vertical carbonization furnace using a charging device, a carbonization step of producing ferro-coke by carbonizing the briquettes while injecting a heated gas into the carbonization zone, a cooling step of cooling the ferro-coke by injecting a cooling gas into the cooling zone, an in-furnace gas discharge step of discharging in-furnace gas from an outlet at the top of the vertical carbonization furnace, and a ferro-coke discharge step of discharging the ferro-coke from the bottom of the cooling zone.

[0004] In the carbonization process, the shaped product is heated by injecting low-temperature gas into the furnace through a low-temperature gas inlet in the middle of the carbonization zone and high-temperature gas into the furnace through a high-temperature gas inlet in the lower part of the carbonization zone. In the cooling process, the ferro-coke is cooled by injecting cooling gas into the furnace through a cooling gas inlet in the lower part of the cooling zone.

[0005] In order to increase the production volume of ferro-coke, it is necessary to increase the volume of the vertical carbonization furnace. Generally, the charge material is charged at an angle using an inclined charging chute, but the heating gas and cooling gas are injected in the depth direction of the vertical carbonization furnace (parallel to the horizontal component of the charge material charging direction). Therefore, in order for the gas to penetrate to the center of the furnace, the internal dimension in the depth direction must be kept below a certain level. Therefore, vertical carbonization furnaces are configured with an internal dimension that is longer in the furnace width direction (the direction perpendicular to the depth direction in the cross section of the carbonization furnace) than in the depth direction, ensuring a large volume.

[0006] Furthermore, Patent Document 2 discloses a method for uniformly loading (transporting) materials, in which a dispersion guide section having an inclined surface that slopes radially downward from the center of the width direction of the transport path toward the exit side is provided to radially disperse the materials. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-057970 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-162271 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in vertical carbonization furnaces, which have a larger width than depth, it is difficult to provide a large number of charging chutes across the entire furnace width to evenly distribute carbon-containing materials. Meanwhile, powder generated by collisions between the briquettes and the charging chute, or between briquettes themselves, tends to segregate and accumulate on the charging chute side at the bottom of the vertical carbonization furnace. This occurs because most of the powder in the charge material passes through the briquettes and settles, causing the charge material to separate into two layers—a briquettes layer (upper layer) and a powder layer (lower layer)—before reaching the carbonization furnace. When one ton of briquettes is charged, the thickness of the charge as it enters the carbonization furnace will be a maximum of about 150 mm. However, since the briquettes are charged from a position higher than the powder below them, they tend to fly to a position far from the charging port, while the powder in the lower layer falls near the charging port.

[0009] Furthermore, at the bottom of a vertical carbonization furnace, the accumulated compacts form a mountain-shaped slope according to the angle of repose. The slope of the mountain-shaped slope becomes steeper as it approaches the top. Therefore, even if the powder lands far from the charging port, it is pushed back somewhat toward the charging port and comes to rest. Therefore, the powder travels a long distance from landing to resting. In other words, the mountain-shaped slope of the compacts reduces dispersion in the depth direction of the carbonization furnace, causing significant uneven distribution of the powder. The segregation of the powder causes uneven gas flow within the furnace, leading to problems such as poor carbonization of the compacts.

[0010] Furthermore, the dispersion guide section disclosed in Patent Document 2 does not affect the flying distance of the powder, so even if the dispersion guide section is installed, it is not possible to eliminate powder segregation on the charging port side.

[0011] The present invention has been made in consideration of the above circumstances, and aims to provide a vertical carbonization furnace, a blast furnace raw material manufacturing apparatus, and a blast furnace raw material manufacturing method that improve the distribution of charge materials within the vertical carbonization furnace, particularly the distribution of powder contained in the charge materials. [Means for solving the problem]

[0012] The gist and configuration of the present invention to solve the above problems are as follows. [1] A vertical carbonization furnace for producing raw materials for a blast furnace by carbonizing a charge containing a carbon-containing substance, the vertical carbonization furnace comprising: a carbonization furnace body for depositing the charge inside; a charging chute for passing the charge into the carbonization furnace body; and an agitator provided inside the carbonization furnace body for agitating the charge deposited inside the carbonization furnace body. [2] A blast furnace raw material manufacturing apparatus that uses the vertical carbonization furnace described in [1] to manufacture raw materials for a blast furnace. [3] The vertical distillation furnace described in [1], wherein the agitator has a rotating shaft portion and a propeller portion arranged around the rotating shaft portion, and is arranged inside the distillation furnace body so that the axial direction of the rotating shaft portion is parallel to the vertical direction. [4] The vertical distillation furnace described in [3], wherein the agitator is positioned within the furnace so that the upper end of the propeller section in the vertical direction is positioned below the top of the charge material accumulated inside the distillation furnace body. [5] A vertical distillation furnace as described in [3] or [4], wherein the agitator is positioned so that the lower end of the propeller section in the vertical direction is located above the position of the central axis of a low-temperature tuyere provided in the furnace wall of the distillation furnace body. [6] A vertical carbonization furnace described in any one of [3] to [5], wherein the ratio d / W of the diameter d of the rotation area of the propeller part in the horizontal direction to the depth direction length W of the carbonization furnace body is a dimension that satisfies the relationship of the following equation (1). 0.5≦d / W≦0.9 (1) [7] A vertical carbonization furnace described in any one of [3] to [6], wherein the ratio h / W of the blade width h of the propeller portion of the agitator in the vertical direction to the depth length W of the carbonization furnace body satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2) [8] An apparatus for producing raw material for a blast furnace, which uses the vertical carbonization furnace according to any one of [3] to [7] to produce raw material for a blast furnace. [9] A method for producing raw materials for a blast furnace, using the apparatus for producing raw materials for a blast furnace described in [8], wherein the propeller part of the agitator is rotated at a rotation speed of 45 rpm or less to agitate the charge.

[10] A method for producing raw materials for a blast furnace according to [9], wherein a preceding charge is charged into the vertical carbonization furnace, and after the preceding charge is stirred by the stirrer, a succeeding charge is charged. [Effects of the Invention]

[0013] According to the present invention, the distribution of the charge material within a vertical carbonization furnace, in particular the distribution of powder contained in the charge material, can be improved. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a side view showing an example of a conventional vertical carbonization furnace. [Figure 2] 1 is a side view showing a vertical carbonization furnace according to one embodiment of the present invention; FIG. [Figure 3] FIG. 10 is a diagram showing the relationship between the maximum powder ratio and the diameter of the rotation region of the propeller portion. [Figure 4] FIG. 10 is a diagram showing the relationship between the maximum powder rate and the blade width of the propeller portion. [Figure 5] FIG. 10 is a diagram showing the relationship between the maximum powder ratio and the rotation speed of the propeller portion. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described below through embodiments of the present invention, taking as an example a case where ferro-coke, a type of molded coke, is produced by mixing a certain amount of iron ore with coal and agglomerating the mixture. The drawings are schematic and may differ from the actual product. The following embodiments are intended to exemplify devices and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope of the claims.

[0016] The configuration of a conventional vertical carbonization furnace 100 will be described with reference to FIG. 1. FIG. 1 shows a schematic side view of the vertical carbonization furnace 100. In the following description, the term "charge material" is not limited to "briquettes containing a carbon-containing material and an iron-containing material" for producing ferro-coke, but may also include "briquettes containing a carbon-containing material." In other words, it is sufficient if the briquettes contain at least a carbon-containing material. The term "charge material" includes "briquettes" and "powder" attached to or separated from the "briquettes." Furthermore, the term "raw material for a blast furnace" refers to "coke" including ferro-coke.

[0017] The vertical carbonization furnace 100 has a charging chute 10, a charging gate 20, a diffusion section 30, and a carbonization furnace body 70. First, a charge material including briquettes containing a carbon-containing material (coal) and an iron-containing material (iron ore) is supplied to the charging chute 10. When the charging gate 20 is closed (see the dashed line in the figure), the charge material is temporarily accumulated inside the charging chute 10 (midway along the charging chute 10). When the charging gate 20 is opened (shown by the solid line in the figure), the charge material passes through the inside of the charging chute 10 toward the carbonization furnace body 70. As the charge material passes through the inside of the charging chute 10, it passes through the diffusion section 30, whereby it is dispersed so as to spread throughout the inside of the charging chute 10. After passing through the inside of the charging chute 10, the charge material is deposited inside the carbonization furnace body 70. The charge material forms a mountain shape in accordance with the angle of repose inside the carbonization furnace body 70.

[0018] As described above, the charge material charged into the carbonization furnace body 70 is separated into two layers, a molded material layer (upper layer) and a powder layer (lower layer), inside the charging chute 10 before reaching the carbonization furnace body 70. Therefore, as shown in FIG. 1, the charge material charged into the carbonization furnace body 70 falls into the carbonization furnace body 70 while being separated into a molded material layer 40 and a powder layer 50. Therefore, the charge material 60 accumulated inside the carbonization furnace body 70 has an uneven distribution of molded material and powder. In other words, in the conventional vertical carbonization furnace 100, the gas flow inside the carbonization furnace body 70 becomes uneven, causing problems such as poor carbonization of the molded material.

[0019] <Configuration of agitator, etc.> Next, the configuration of a vertical carbonization furnace 11 according to one embodiment of the present invention will be described with reference to Fig. 2. Fig. 2 is a schematic side view of the vertical carbonization furnace 11 included in the blast furnace raw material manufacturing apparatus 12. The vertical carbonization furnace 11 shown in Fig. 2 further includes an agitator 8 in addition to the vertical carbonization furnace 100 shown in Fig. 1.

[0020] As shown in FIG. 2, a vertical carbonization furnace 11 according to one embodiment of the present invention has an agitator 8 installed inside the carbonization furnace body 7. The agitator 8 has a rotating shaft 8a, a propeller 8b, and an agitation control unit 8c. The agitator 8 is arranged inside the carbonization furnace body 7 so that the axial direction of the rotating shaft 8a is parallel to the vertical direction. The rotating shaft 8a receives a control signal from the agitation control unit 8c and its rotation is controlled inside the carbonization furnace body 7. The propeller 8b is arranged around the rotating shaft 8a. The propeller 8b is controlled to rotate inside the carbonization furnace body 7 in accordance with the rotation of the rotating shaft 8a. The agitation control unit 8c sends a control signal for rotation control to the rotating shaft 8a.

[0021] According to this embodiment, an agitator 8 is provided inside the carbonization furnace body 7. Therefore, the agitator 8 can level the mountain-shaped charge material 6 by agitating the charge material 6 piled up inside the furnace. Then, by leveling the mountain-shaped charge material 6, mixing of the "molded material" and "powder" of the charge material 6 is promoted in the vertical and horizontal directions. Therefore, the distribution of the charge material 6 inside the vertical carbonization furnace 11, in particular the distribution of the powder contained in the charge material 6, can be improved.

[0022] The propeller portion 8b of the agitator 8 is preferably sized so that the ratio (d / W) of the diameter d to the depth length W satisfies the relationship of the following equation (1), where d is the diameter of the rotation area of the propeller portion 8b in the horizontal direction and W is the depth length in the depth direction S of the dry distillation furnace body 7. 0.5≦d / W≦0.9 (1)

[0023] If d / W is less than 0.5, the rotation area of the propeller portion 8b becomes narrow, and the stirring range also becomes narrow, making it impossible to efficiently alleviate powder segregation.If d / W exceeds 0.8, the gap between the propeller portion 8b and the furnace wall of the vertical carbonization furnace 11 becomes narrow, and the charge (molded material) between the propeller portion 8b and the furnace wall becomes powdered.

[0024] It is preferable that the propeller portion 8b of the agitator 8 has a dimension such that the ratio (h / W) of the blade width h to the depth length W satisfies the relationship of the following equation (2), where h is the blade width of the propeller portion in the vertical direction and W is the depth length in the depth direction S of the carbonization furnace body 7. 0.05≦h / W≦0.3 (2)

[0025] If h / W is less than 0.05, most of the charge material in contact with the propeller portion 8b will wrap around above and below the propeller portion 8b, making it impossible to efficiently mitigate powder segregation.If h / W exceeds 0.3, excessive load is applied to the charge material 6 due to contact with the propeller portion 8b, and the molded materials contained in the charge material 6 will crash forcefully against the furnace wall and be pulverized.

[0026] It is preferable that the propeller portion 8b of the agitator 8 is arranged so that the lower end portion B of the propeller portion 8b in the vertical direction is located above the position of the central axis O of the low-temperature tuyere 9 provided in the furnace wall of the carbonization furnace main body 7.

[0027] Specifically, the carbonization furnace body 7 introduces heating gas into the furnace through the low-temperature tuyere 9 to heat the charge 6 placed inside the furnace. As shown in FIG. 2, the lower end B of the propeller section 8b is positioned above the central axis O of the low-temperature tuyere 9, thereby improving the uneven flow of the heating gas introduced from the low-temperature tuyere 9 and rising inside the furnace. Therefore, the rotation of the propeller section 8b eliminates uneven distribution of powder contained in the charge 6 and also reduces the uneven flow of the heating gas present vertically below the propeller section 8b.

[0028] <Blast furnace raw material manufacturing method> Next, a method for producing raw materials for a blast furnace in which the charge 6 accumulated inside the carbonization furnace body 7 is stirred by a vertical carbonization furnace 11 having a stirrer 8 will be described.

[0029] 2, the agitator 8 is preferably disposed in the furnace so that when the charge is charged into the carbonization furnace body 7, the agitator 8 is immersed in a position below the top P of the charge 6 piled up in the furnace. Specifically, when the charge is charged into the carbonization furnace body 7, the agitator 8 is preferably disposed in the furnace so that the upper end T of the propeller portion 8b of the agitator 8 in the vertical direction is positioned below the top P of the charge 6 piled up in the furnace.

[0030] By immersing the agitator 8 in the charge material 6 accumulated inside the carbonization furnace body 7 as described above, the charge material 6 can be agitated efficiently.

[0031] The agitator 8 preferably rotates the propeller portion 8b at a rotation speed of 45 rpm or less to agitate the charge 6. If the rotation speed of the propeller portion 8b exceeds 45 rpm, powdering of the molded material in contact with the propeller portion 8b occurs.

[0032] As described above with reference to FIG. 1, the charge material charged first into the vertical carbonization furnace 11 (hereinafter also referred to as the "preceding charge material") is piled up in a mountain shape inside the carbonization furnace body 7. The charge material charged subsequently into the vertical carbonization furnace 11 (hereinafter also referred to as the "following charge material") is separated into two layers, a molded material layer 4 and a powder layer 5, when it falls from the charging chute 1 toward the inside of the carbonization furnace body 7. When the powder layer 5 of the following charge material lands near the top P of the mountain shape formed by the preceding charge material, it travels a long distance along the slope of the mountain shape until it comes to rest. As a result, the moving distance of the powder contained in the powder layer 5 of the following charge material becomes long, and the uneven distribution of the powder in the charge material 6 piled up inside the carbonization furnace body 7 becomes significant.

[0033] For this reason, in this embodiment, when the preceding charge material that is charged first into the vertical carbonization furnace 11 piles up in a mountain shape inside the carbonization furnace body 7, the preceding charge material is stirred by the agitator 8 to level the charge material. Thereafter, by charging the following charge material into the vertical carbonization furnace 11, when the following charge material falls toward the inside of the carbonization furnace body 7, the preceding charge material does not form a mountain shape, so that uneven distribution of powder contained in the following charge material does not occur, and powder segregation can be mitigated.

[0034] As mentioned above, it is preferable that the agitator 8 is positioned inside the furnace so that when the charge is loaded into the carbonization furnace body 7, the upper end T of the propeller portion 8b in the vertical direction is positioned below the top P of the charge 6 accumulated inside the carbonization furnace body 7.

[0035] That is, it is preferable that the position of the agitator 8 be determined based on the position (height) of the top P of the charge material 6 accumulated inside the carbonization furnace body 7. Here, the charge material 6 charged into the carbonization furnace body 7 and accumulated inside is predetermined in one charge amount (one batch amount). Therefore, the position (height) of the top P of the charge material 6 accumulated inside the carbonization furnace body 7 may be determined in advance based on empirical values such as past operational data. Then, based on the predetermined position (height) of the top P, the position of the agitator 8 may be determined in advance, as described above in this embodiment.

[0036] In addition, if the amount of the charge material 6 to be charged into the vertical distillation furnace 11 is not determined and the amount of the charge material 6 is changed each time it is charged, a measuring device for measuring the position (height) of the top P of the charge material 6 accumulated inside the vertical distillation furnace 11 (distillation furnace body 7) may be provided, and based on the measurement results from the measuring device, the position of the agitator 8 may be determined as described above in this embodiment, and the agitator 8 may be controlled to move toward the determined position. [Example]

[0037] Hereinafter, examples carried out using the vertical carbonization furnace and the method for producing raw materials for a blast furnace according to this embodiment will be described.

[0038] A test device simulating the vertical carbonization furnace (see FIG. 2) of this embodiment for producing ferro-coke was used to investigate the distribution of charge materials in the depth direction of the vertical carbonization furnace when charge materials including briquettes were charged. A charging chute of the same shape as that installed in the actual furnace was used, and a collection box simulating a carbonization furnace was installed on the outlet side of the charging chute. 25 kg of charge materials (95% briquettes + 5% powder) were charged through the charging chute and stirred with a stirrer installed inside the collection box simulating a carbonization furnace. The charge materials were then sampled at five points in the depth direction within the collection box, and the fineness ratio was investigated. The "fineness ratio" was defined as the weight ratio (%) of the powder in the charge materials.

[0039] In this example, particles with a diameter of 20 mm or more were considered to be "molded products," and particles with a diameter of less than 20 mm were considered to be "powder." The powder ratio was measured at five points in the depth direction within the collection box, and the "maximum powder ratio (%)" (the maximum value of the powder ratio obtained by comparing the powder ratios of the five samples) was used as an index of powder segregation.

[0040] First, we investigated the effect of the "diameter d" of the propeller rotation area on the "maximum powder rate." The results of investigating the relationship between the "maximum powder rate" and the "diameter d" are shown in Figure 3. In Figure 3, the vertical axis represents the "maximum powder rate" and the horizontal axis represents "d / W."

[0041] In Figure 3, "d / W" on the horizontal axis is the ratio (d / W) of the diameter d of the rotation area of the propeller part to the length W in the depth direction, and is a value calculated by equation (1). Figure 3 shows examples in which "d / W" was varied. In these examples, the propeller part of the agitator was tested with a blade width h that satisfied h / W = 0.2 and a rotation speed of 30 rpm.

[0042] As shown in Figure 3, by adjusting "d / W" to a value that satisfies the range of 0.3≦d / W≦0.95, the "maximum powder ratio" could be suppressed compared to the "comparison example (without vibration)." Furthermore, it was confirmed that by setting the diameter d of the rotation area of the propeller part to a value that satisfies 0.5≦d / W≦0.9, it was possible to efficiently alleviate the uneven distribution of powder contained in the charge material accumulated inside the vertical carbonization furnace.

[0043] Furthermore, when d / W is less than 0.5, the rotation area of the propeller becomes narrower, and the stirring range also becomes narrower, so it was confirmed that powder segregation cannot be efficiently alleviated.When d / W exceeds 0.9, the gap between the propeller and the furnace wall of the vertical carbonization furnace becomes narrower, and it was confirmed that the charge material (molded material) between the propeller and the furnace wall becomes powdered.

[0044] Next, we investigated the effect of the "blade width h" of the propeller on the "maximum powder rate." The results of investigating the relationship between the "maximum powder rate" and the "blade width h" are shown in Figure 4. In Figure 4, the vertical axis represents the "maximum powder rate" and the horizontal axis represents "h / W."

[0045] In Figure 4, "h / W" on the horizontal axis is the ratio (h / W) of the blade width h of the propeller part in the vertical direction to the length W in the depth direction, and is a value calculated using equation (2). Figure 4 shows examples in which "h / W" was varied and investigated. In these examples, the propeller part of the agitator was tested with the diameter d of the rotation region set to a value that satisfied d / W = 0.6, and the rotation speed was set to 30 rpm.

[0046] As shown in Figure 4, by adjusting "h / W" to a value that satisfies the range of 0.025≦h / W≦0.45, the "maximum powder ratio" could be suppressed compared to the "comparison example (without vibration)." Furthermore, it was confirmed that by setting the dimension of the blade width h of the propeller part to a value that satisfies 0.05≦h / W≦0.3, it was possible to efficiently alleviate the uneven distribution of powder contained in the charge material accumulated inside the vertical carbonization furnace.

[0047] It was confirmed that when h / W is less than 0.05, most of the charge material that comes into contact with the propeller part moves around above and below the propeller part, resulting in poor mixing efficiency. When h / W exceeds 0.3, the area of the propeller part 8b increases, and the contact area between the charge material and the propeller part 8b also increases, so the operating energy of the agitator 8 becomes excessive, causing energy problems.

[0048] Next, we investigated the effect of the "rotation speed" of the propeller on the "maximum powder rate." The results of investigating the relationship between the "maximum powder rate" and the "rotation speed" are shown in Figure 5. In Figure 5, the vertical axis represents the "maximum powder rate" and the horizontal axis represents the "rotation speed (rpm)."

[0049] Figure 5 shows an example where the rotation speed was changed. In this example, the diameter d of the rotating area of the propeller part of the agitator was set to a value that satisfied d / W = 0.6, and the blade width h was set to a value that satisfied h / W = 0.2.

[0050] As shown in Figure 5, the rotation (stirring) of the propeller part was able to suppress the "maximum powder ratio" compared to the "comparison example (without vibration)." It was also confirmed that by setting the rotation speed of the propeller part to a value of 45 rpm or less, it was possible to efficiently alleviate the uneven distribution of powder contained in the charge material accumulated inside the vertical carbonization furnace.

[0051] Furthermore, when the rotation speed of the propeller exceeded 45 rpm, it was confirmed that part of the molded product that came into contact with the propeller was powdered. [Explanation of symbols]

[0052] 1 Charging chute 2 Charging gate 3 Diffusion section 4 Molding layer 5 Powder layer 6 Charge 7. Carbonization furnace body 8. Mixer 8a Rotating shaft 8b Propeller section 8c Mixing control section 9 Low temperature tuyere 11 Vertical carbonization furnace 12 Blast furnace raw material production equipment 10 Charging chute 20 Charging gate 30 Diffusion section 40 Molding layer 50 powder bed 60 Charge 70 Dry distillation furnace body 100 Vertical carbonization furnace B (Propeller section) Lower end O Central axis (of the cold tuyere) P (Top of charge) S Depth direction of vertical carbonization furnace T (Propeller section) upper end W: Depth of vertical carbonization furnace d Diameter (of the rotating area of the propeller) h (propeller part) wingspan

Claims

1. A vertical carbonization furnace for producing a raw material for a blast furnace by carbonizing a charge containing a carbon-containing substance, a carbonization furnace body in which the charge is deposited; a charging chute for sending the charge material to the carbonization furnace body; an agitator provided inside the carbonization furnace body and configured to agitate the charge material accumulated inside the carbonization furnace body; and The agitator has a rotating shaft portion and a propeller portion disposed around the rotating shaft portion, Inside the carbonization furnace body, the axial direction of the rotating shaft portion is arranged parallel to the vertical direction. Vertical carbonization furnace.

2. A blast furnace raw material producing apparatus for producing blast furnace raw material using the vertical carbonization furnace according to claim 1.

3. The vertical distillation furnace according to claim 1, wherein the agitator is arranged in the furnace so that the upper end of the propeller portion in the vertical direction is positioned below the top of the charge material accumulated inside the distillation furnace body.

4. The vertical distillation furnace according to claim 1, wherein the agitator is positioned so that the lower end of the propeller portion in the vertical direction is located above the position of the central axis of a low-temperature tuyere provided in the furnace wall of the distillation furnace body.

5. The vertical carbonization furnace according to claim 3, wherein the agitator is positioned so that the lower end of the propeller portion in the vertical direction is located above the position of the central axis of a low-temperature tuyere provided in the furnace wall of the carbonization furnace body.

6. The propeller portion of the agitator has a dimension such that the ratio d / W of the diameter d of the rotation area of the propeller portion in the horizontal direction to the depth length W of the distillation furnace body satisfies the relationship of the following equation (1). 0.5≦d / W≦0.9 (1)

7. The propeller portion of the agitator has a dimension such that the ratio d / W of the diameter d of the rotation area of the propeller portion in the horizontal direction to the depth length W of the distillation furnace body satisfies the relationship of the following equation (1). 0.5≦d / W≦0.9 (1)

8. The propeller portion of the agitator has a dimension such that the ratio d / W of the diameter d of the rotation area of the propeller portion in the horizontal direction to the depth direction length W of the distillation furnace body satisfies the relationship of the following equation (1). 0.5≦d / W≦0.9 (1)

9. The propeller portion of the agitator has a dimension such that the ratio d / W of the diameter d of the rotation area of the propeller portion in the horizontal direction to the depth length W of the distillation furnace body satisfies the relationship of the following equation (1). 0.5≦d / W≦0.9 (1)

10. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction, and a ratio h / W of the blade width h of the propeller portion in the vertical direction to the depth direction length W of the distillation furnace body, which satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2)

11. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction, and a ratio h / W of the blade width h of the propeller portion in the vertical direction to the depth direction length W of the distillation furnace body, which satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2)

12. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction and a depth direction length W of the distillation furnace body, and the ratio h / W of these dimensions satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2)

13. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction and a depth direction length W of the distillation furnace body, and the ratio h / W of these dimensions satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2)

14. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction and a depth direction length W of the distillation furnace body, and the ratio h / W of these dimensions satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2)

15. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction, and a ratio h / W of the blade width h of the propeller portion in the vertical direction to the depth direction length W of the carbonization furnace body, which satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2)

16. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction, and a ratio h / W of the blade width h of the propeller portion in the vertical direction to the depth direction length W of the carbonization furnace body, which satisfies the relationship of the following equation (2). 0.05≦h / W≦0.3 (2)

17. The propeller portion of the agitator has a blade width h of the propeller portion in the vertical direction, and a ratio h / W of the blade width h of the propeller portion in the vertical direction to the depth direction length W of the carbonization furnace body, which satisfies the relationship of the following formula (2). 0.05≦h / W≦0.3 (2)

18. A blast furnace raw material producing apparatus for producing blast furnace raw material using the vertical carbonization furnace according to any one of claims 1 and 3 to 17.

19. 20. A method for producing raw material for a blast furnace, using the apparatus for producing raw material for a blast furnace according to claim 18, wherein the propeller portion of the agitator is rotated at a rotation speed of 45 rpm or less to agitate the charge.

20. 20. The method for producing a raw material for a blast furnace according to claim 19, wherein a preceding charge is charged into the vertical carbonization furnace, and the preceding charge is stirred by the stirrer, and then a succeeding charge is charged.

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