Vertical dry distillation furnace, raw material manufacturing apparatus for blast furnace, and raw material manufacturing method for blast furnace

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 vibrator that is provided on the furnace wall of the retort body and vibrates the charge accumulated inside the retort body.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vertical retort furnace for producing coke, a raw material manufacturing apparatus for a blast furnace, and a raw material manufacturing method for a blast furnace.

Background Art

[0002] In recent years, from the perspective of global warming, reduction of the amount of CO 2 gas generation has been demanded in the steel industry. For this reason, reduction of the amount of fossil fuel used has become an urgent task. In the steel industry, hot metal is produced by reducing iron ore with carbon (coke produced by carbonizing coal in a coke oven) in a blast furnace. And, in order to reduce the coke unit, development of a technology using ferrocoke as a raw material for a blast furnace has been carried out. Ferrocoke is obtained by mixing a certain amount of iron ore with coal, forming into lumps, and then subjecting to a carbonization treatment to disperse fine metallic iron particles in the coke, and it is a formed coke with enhanced reactivity of the coke due to the catalytic action of the metallic iron.

[0003] As a carbonization method of ferrocoke, a method using a vertical retort furnace has been proposed. Patent Document 1 discloses a vertical retort furnace having a carbonization zone at the upper part and a cooling zone at the lower part. The method for producing ferrocoke in a vertical retort furnace includes a charging step of charging a formed product composed of a carbon-containing substance and an iron-containing substance into the vertical retort furnace using a charging device, a carbonization step of blowing a heating gas into the carbonization zone and carbonizing the formed product to produce ferrocoke, a cooling step of cooling the ferrocoke by blowing a cooling gas into the cooling zone, a furnace gas discharging step of discharging the furnace gas from the discharge port at the top of the vertical retort furnace, and a ferrocoke discharging step of discharging the ferrocoke from the lower part of the cooling zone.

[0004] In the carbonization step, the formed product is heated by blowing a low-temperature gas from a low-temperature gas blowing tuyere in the middle part of the carbonization zone and a high-temperature gas from a high-temperature gas blowing tuyere in the lower part of the carbonization zone into the furnace, respectively. In the cooling step, the ferrocoke is cooled by blowing a cooling gas from a cooling gas blowing tuyere in the lower part of the cooling zone.

[0005] Here, in order to increase the production amount of ferrocoke, it is necessary to increase the volume of the vertical retort furnace. Generally, the charged material is charged in an inclined direction using an inclined charging chute, with the inclined direction being the charging direction. However, since the heating gas and the cooling gas are injected in the depth direction of the vertical retort furnace (parallel to the horizontal component of the charging direction of the charged material), it is necessary to keep the inner dimension in the depth direction below a certain level in order to allow the gas to penetrate to the central part of the furnace. Therefore, the vertical retort furnace is configured to have a longer inner dimension in the furnace width direction (the direction orthogonal to the depth direction in the cross-section of the retort furnace) compared to the depth direction, ensuring a large volume.

[0006] Also, Patent Document 2 discloses a method of uniformly charging (conveying) a material by providing a dispersion guiding part having an inclined surface that slopes radially downward from the central part in the width direction of the conveying path toward the outlet side, thereby dispersing the material radially.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in a vertical retort furnace having a structure with a larger size in the furnace width direction than in the depth direction, in order to evenly disperse the carbon-containing material corresponding to the size in the furnace width direction, it is difficult to arrange a large number of charging shoots corresponding to all positions in the furnace width direction. On the other hand, the powder generated by the collision of the molded product with the wall surface of the charging shoot or the collision of the molded products is prone to segregation and tends to accumulate on the charging shoot side at the bottom of the vertical retort furnace. This is because, in the process of passing through the charging shoot, most of the powder in the charged material slips through between the molded products and settles, causing the charged material to separate into two layers, a molded product layer (upper layer) and a powder layer (lower layer), before reaching the retort furnace. When 1 ton of molded product is charged, the thickness of the charged material when entering the retort furnace is at most about 150 mm. However, since the molded product is charged from a position higher than the powder existing below it, it is likely to fly to a position far from the charging port, while the powder in the lower layer falls near the charging port.

[0009] Also, at the bottom of the vertical retort furnace, the deposited molded products form a mountain-shaped slope according to the angle of repose. And the formed mountain-shaped slope has a greater inclination as it gets closer to the top. Therefore, even when the powder lands at a position far from the charging port, it is slightly pushed back toward the charging port side and comes to rest. Thus, the moving distance of the powder from when it lands until it comes to rest becomes large. That is, the mountain-shaped slope formed by the molded products reduces the dispersion in the depth direction of the retort furnace and causes significant uneven distribution of the powder. Due to the segregation of the powder, the gas flow in the furnace becomes non-uniform, resulting in problems such as poor carbonization of the molded products.

[0010] Also, since the dispersion guiding part disclosed in Patent Document 2 does not affect the flying distance of the powder, even if the dispersion guiding part is installed, the powder segregation on the charging port side cannot be eliminated.

[0011] The present invention has been made in view of such circumstances, and an object thereof is to provide a vertical retort furnace, a raw material manufacturing apparatus for a blast furnace, and a raw material manufacturing method for a blast furnace that improve the distribution of the charged material in the vertical retort furnace, particularly the distribution of the powder contained in the charged material.

Means for Solving the Problems

[0012] The gist configuration of the present invention for solving the above problems is as follows. [1] A vertical retort furnace for producing raw materials for a blast furnace by retorting a charged material containing a carbonaceous substance, comprising a retort furnace body for depositing the charged material therein, a charging chute for feeding the charged material into the retort furnace body, and a vibration device provided on the furnace wall of the retort furnace body for imparting vibration to the charged material deposited inside the retort furnace body. [2] The vibration device is provided on the furnace wall at a position below the height position of the top of the charged material deposited inside the retort furnace body, and is provided at a position where the ratio D / W of the height difference D from the upper end of the vibration device to the top of the charged material and the length W in the depth direction of the retort furnace body satisfies the relationship of the following formula (1). The vertical retort furnace according to [1]. 0.2 ≦ D / W ≦ 0.4 ··· (1) [3] The vibration device is provided at positions on the furnace walls facing each other across the top of the charged material in the depth direction of the retort furnace body. The vertical retort furnace according to [1] or [2]. [4] A blast furnace raw material production device for producing blast furnace raw materials using the vertical retort furnace according to any one of [1] to [3]. [5] A blast furnace raw material production method for imparting horizontal vibration to the charged material by the vibration device using the blast furnace raw material production device according to [4]. [6] The vibration device imparts vibration so that the ratio A / d of the amplitude A of the vibration imparted to the charged material and the average diameter d of the molded product contained in the charged material satisfies the relationship of the following formula (2). The blast furnace raw material production method according to [5]. 2.0 ≦ A / d ≦ 3.0 ··· (2) [7] The vibration device imparts vibration to the charged material with the vibration frequency being 4 Hz or more and 12 Hz or less. The blast furnace raw material production method according to [5] or [6]. [8] After a previous charged material is charged into the vertical retort furnace and vibration by the vibration device is imparted to the previous charged material, a subsequent charged material is charged. The blast furnace raw material production method according to [7].

Advantages of the Invention

[0013] According to the present invention, it is possible to improve the distribution of the charged material in the vertical retort furnace, particularly the distribution of the powder contained in the charged material.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0015] Hereinafter, the present invention will be described through embodiments of the present invention by taking as an example the case of producing ferrocoke, which is a kind of formed coke obtained by mixing a certain amount of iron ore with coal and briquetting it. Here, each drawing is schematic and may be different from the actual one. Further, the following embodiments illustrate devices and methods for embodying the technical idea of the present invention, and do not specify the configuration to the following ones. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

[0016] Referring to FIG. 1, the configuration of a conventional vertical retort furnace 100 will be described. FIG. 1 shows a schematic side view of the vertical retort furnace 100. In the following description, the "charged material" is not limited to the "molded product containing a carbon-containing substance and an iron-containing substance" for producing ferrocoke, but may also include the "molded product containing a carbon-containing substance". That is, any molded product containing at least a carbon-containing substance may be used. The "charged material" includes the "molded product" and the "powder" attached to or separated from the "molded product". Further, the "blast furnace raw material" means "coke" including ferrocoke.

[0017] The vertical retort furnace 100 includes a charging chute 10, a charging gate 20, a diffusing section 30, and a retort furnace body 70. First, the charged material including the molded product containing a carbon-containing substance (coal) and an iron-containing substance (iron ore) is supplied to the charging chute 10. The charged material is temporarily accumulated inside the charging chute 10 (in the middle of the charging chute 10) by closing the charging gate 20 (refer to the dashed line in the figure). The charged material is sent through the inside of the charging chute 10 toward the retort furnace body 70 by opening the charging gate 20 (shown by the solid line in the figure). When the charged material passes through the inside of the charging chute 10, it passes through the diffusing section 30 and is dispersed so as to spread inside the charging chute 10. After passing through the inside of the charging chute 10, the charged material accumulates inside the retort furnace body 70. The charged material forms a mountain shape according to the angle of repose inside the retort furnace body 70.

[0018] Here, as described above, the charged material charged into the retort furnace body 70 is separated into two layers, a molded product layer (upper layer) and a powder layer (lower layer), inside the charging chute 10 before reaching the retort furnace body 70. Therefore, as shown in FIG. 1, the charged material charged into the retort furnace body 70 falls inside the retort furnace body 70 while separating into the molded product layer 40 and the powder layer 50. For this reason, the charged material 60 accumulated inside the retort furnace body 70 is in a state where the molded product and the powder are unevenly distributed. Due to this uneven distribution, in the conventional vertical retort furnace 100, the gas flow inside the retort furnace body 70 becomes non-uniform, and problems such as poor carbonization of the molded product occur.

[0019] <Configuration of vibration device etc.> Next, with reference to FIG. 2, the configuration of the vertical retort furnace 11 which is an embodiment of the present invention will be described. FIG. 2 is a schematic side view of the vertical retort furnace 11 included in the raw material manufacturing apparatus 12 for blast furnaces. The vertical retort furnace 11 shown in FIG. 2 further includes a vibration device 8 with respect to the vertical retort furnace 100 shown in FIG. 1.

[0020] FIG. 2(a) shows a state where a pre-charge is charged into the vertical retort furnace 11. FIG. 2(b) shows a state where vibration oscillated from the vibration device 8 is applied to the pre-charge charged into the vertical retort furnace 11. FIG. 2(c) shows a state where a post-charge is charged onto the pre-charge to which vibration from the vibration device 8 is applied inside the furnace of the vertical retort furnace 11.

[0021] As shown in FIG. 2(a), the vibration device 8 is provided on the furnace wall of the retort furnace main body 7. Therefore, the vibration device 8 can level the charged material 6 formed in a mountain shape by applying vibration to the charged material 6. And by leveling the charged material 6 formed in a mountain shape, the mixing of the "formed product" and the "powder" of the charged material 6 is promoted in the vertical direction and the horizontal direction. For this reason, the distribution of the charged material 6 in the furnace of the vertical retort furnace 11, particularly the distribution of the powder contained in the charged material 6, can be improved.

[0022] The vibration device 8 is preferably provided on the furnace wall at a position below the height position of the top P of the charged material 6 deposited inside the retort furnace main body 7. Further, when the height difference from the upper end of the vibration device 8 to the top P of the charged material 6 is D and the length in the depth direction S of the retort furnace main body 7 in the depth direction is W, the vibration device 8 is preferably provided at a position where the ratio (D / W) of the height difference D to the length in the depth direction W satisfies the relationship of the following formula (1). By providing the vibration device 8 at a position satisfying the relationship of the following formula (1), the charged material 6 formed in a mountain shape can be efficiently leveled (collapsed). 0.2 ≦ D / W ≦ 0.4 ···(1)

[0023] The vibration device 8 is preferably provided at positions on the furnace walls facing each other across the top P of the charged material 6 in the depth direction S of the retort furnace main body 7.

[0024] <Method for manufacturing raw materials for blast furnace> Next, a method for manufacturing raw materials for a blast furnace, in which vibration is applied to the charged material 6 deposited inside the dry distillation furnace body 7 by means of the vertical dry distillation furnace 11 having a vibration device 8, will be described with reference to FIGS. 2(b) and 2(c). In FIGS. 2(b) and 2(c), illustration of the charging chute 1, charging gate 2, and diffusion section 3 shown in FIG. 2(a) is omitted.

[0025] As shown in FIG. 2(b), the vibration device 8 applies horizontal vibration to the charged material 6 deposited inside the dry distillation furnace body 7. Thereby, it becomes possible to efficiently level (collapse) the charged material 6 formed in a mountain shape.

[0026] Further, when the amplitude of the vibration applied to the charged material 6 by the vibration device 8 is A and the average diameter of the molded product contained in the charged material 6 is d, it is preferable that the vibration is applied so that the ratio (A / d) of the amplitude A to the average diameter d satisfies the relationship of the following formula (2). 2.0 ≦ A / d ≦ 3.0 ···(2)

[0027] By applying vibration to the charged material 6 so that the vibration device 8 satisfies the formula (2), the charged material 6 formed in a mountain shape can be more efficiently leveled. Note that when A / d is less than 2.0, the charged material formed in a mountain shape cannot be efficiently leveled. When A / d exceeds 3.0, the molded product contained in the charged material 6 violently collides with the furnace wall and pulverizes.

[0028] It is preferable that the vibration device 8 applies vibration to the charged material 6 with the vibration frequency being 4 Hz or more and 12 Hz or less. By applying vibration at a frequency of 4 Hz or more and 12 Hz or less, the charged material 6 formed in a mountain shape can be more efficiently leveled. Note that when the frequency is less than 4 Hz, the charged material formed in a mountain shape cannot be efficiently leveled. When the frequency exceeds 12 Hz, the molded product contained in the charged material 6 violently collides with the furnace wall and pulverizes.

[0029] Here, as described above with reference to FIG. 1, the charge (hereinafter also referred to as the "preceding charge") previously charged into the vertical retort furnace 11 is formed in a mountain shape and deposited inside the retort furnace body 7. Then, the charge (hereinafter also referred to as the "subsequent charge") subsequently charged into the vertical retort furnace 11 is separated into two layers, namely the molded product layer 4 and the powder layer 5, when it falls from the charging chute 1 into the interior of the retort furnace body 7. And when the powder layer 5 of the subsequent charge lands near the top P of the mountain shape formed by the preceding charge, the moving distance until it moves along the slope of the mountain shape and comes to rest becomes large. For this reason, the moving distance of the powder contained in the powder layer 5 of the subsequent charge becomes large, and the uneven distribution of the powder in the charge 6 deposited inside the retort furnace body 7 becomes remarkable.

[0030] Therefore, in the present embodiment, when the preceding charge previously charged into the vertical retort furnace 11 is deposited in a mountain shape inside the retort furnace body 7, vibration is applied to the preceding charge by the vibration device 8 to level the charge. Then, by charging the subsequent charge into the vertical retort furnace 11, when the subsequent charge falls into the interior of the retort furnace body 7, since the preceding charge is not formed in a mountain shape, uneven distribution of the powder contained in the subsequent charge does not occur, and powder segregation can be alleviated.

[0031] As described above, the vibration device 8 is preferably provided on the furnace wall at a position below the height position of the top P of the charge 6 deposited inside the retort furnace body 7. Further, the vibration device 8 is preferably provided at a position satisfying the relationship of formula (1) (0.2 ≦ D / W ≦ 0.4). Furthermore, the vibration device 8 is preferably provided at positions on the furnace walls facing each other across the top P of the charge 6 in the depth direction S of the retort furnace body 7.

[0032] That is, it is preferable that the position where the vibration device 8 is arranged is determined based on the position ("height" and "horizontal position") of the top P of the charged material 6 deposited inside the carbonization furnace body 7. Here, the charged material 6 charged into the vertical carbonization furnace 11 and deposited inside the carbonization furnace body 7 has a predetermined single charge amount (one batch amount). Therefore, based on empirical values such as past operation data, the position ("height" and "horizontal position") of the top P of the charged material 6 deposited inside the carbonization furnace body 7 may be determined in advance. Then, based on the predetermined position of the top P ("height" and "horizontal position"), as described above in this embodiment, the position of the vibration device 8 may be determined.

[0033] In addition, when the charge amount of the charged material 6 charged into the vertical carbonization furnace 11 is not determined and the charge amount of the charged material 6 is changed each time it is charged, a measuring device for measuring the position ("height" and "horizontal position") of the top P of the charged material 6 deposited inside the vertical carbonization furnace 11 (carbonization furnace body 7) is provided, and based on the measurement result by the measuring device, the position of the vibration device 8 may be determined as described above in this embodiment, and the vibration device 8 may be controlled to move toward the determined position.

Example

[0034] Hereinafter, examples performed using the vertical carbonization furnace and the raw material production method for blast furnaces according to this embodiment will be described.

[0035] Using a test device that simulated the vertical carbonization furnace (see FIG. 2) of this embodiment for ferro-coke production, the charge distribution in the depth direction of the vertical carbonization furnace when charging a charged material containing a molded product was investigated. The charging chute used was the same shape as the one installed in the actual machine, and a recovery box imitating the carbonization furnace was installed on the outlet side of the charging chute. 25 kg of the charged material (molded product: 95% + powder: 5%) was charged from the charging chute, and vibration was applied under predetermined conditions by a vibration device installed on the wall surface of the recovery box imitating the carbonization furnace to level the mountain shape formed by the charged material. Then, the height of the charged material was measured at five points in the depth direction inside the recovery box.

[0036] Subsequently, 25 kg of the charged material (molded product: 95% + powder: 5%) was additionally charged from the charging chute, and the charged material was sampled at five points in the depth direction within the recovery box to investigate the powder ratio. In this example, particles with a diameter of 20 mm or more were investigated as "molded products", and particles with a diameter of less than 20 mm were investigated as "powder". The "powder ratio" was defined as the weight ratio (%) of the powder in the charged material. Also, as an index of the smoothness of the mountain shape formed by the charged material, "standard deviation of the charged material height (mm)" (the standard deviation obtained from the measurement results of the measurement points (five points) of the height of the charged material) was used. And as an index of powder segregation, "maximum powder ratio (%)" (the maximum value of the powder ratios obtained by comparing the powder ratios of the samples (five points)) was used.

[0037] First, the influence of the "vibration position" on the "standard deviation of the charged material height" and the "maximum powder ratio" was investigated. The results of the investigation of the relationship between the "standard deviation of the charged material height" and the "maximum powder ratio" and the "vibration position" are shown in Fig. 3. Fig. 3 shows the vertical axis as the "standard deviation of the charged material height" and the "maximum powder ratio", and the horizontal axis as the "vibration position".

[0038] The "vibration position" is the ratio (D / W) of the height difference D between the top of the vibration device and the charged material described above and the length W in the depth direction, and is a value calculated by equation (1). Fig. 3 shows the examples investigated by changing the "vibration position (D / W)". The vibration device specified the range where vibration was applied on the wall surface of the recovery box. That is, Fig. 3 shows the results of implementing vibration in the range where "0.2 ≤ D / W ≤ 0.3", vibration in the range where "0.2 ≤ D / W ≤ 0.4", etc., as described on the horizontal axis. In this example, the vibration applied to the charged material by the vibration device was carried out with a value of A / d = 2.0 for the amplitude, a frequency of 5 Hz, and the vibration direction being the horizontal direction.

[0039] As shown in Fig. 3, by adjusting the "vibration position" to a value that satisfies the range of 0.1 ≦ D / W ≦ 0.5, the "standard deviation of the charge height" and the "maximum powder ratio" could be suppressed with respect to the "comparative example (without vibration)". And by setting the "vibration position" to a position that satisfies 0.2 ≦ D / W ≦ 0.4, it was confirmed that it is possible to level the charge formed in a ridge shape efficiently and alleviate the uneven distribution of the powder contained in the subsequent charge (the later charge).

[0040] Next, the influence of the "vibration direction" on the "standard deviation of the charge height" and the "maximum powder ratio" was investigated. Fig. 4 shows the results of the investigation of the relationship between the "standard deviation of the charge height" and the "maximum powder ratio" and the "vibration direction". Fig. 4 shows the vertical axis as the "standard deviation of the charge height" and the "maximum powder ratio", and the horizontal axis as the "vibration direction".

[0041] The "vibration direction" is the direction of oscillation of the vibration imparted by the vibration device to the charge deposited inside the vertical retort furnace. Fig. 4 shows the examples investigated by changing the "vibration direction". In this example, the vibration imparted to the charge by the vibration device was carried out with a value of A / d = 2.0 for the amplitude, a frequency of 5 Hz, and a "vibration position" that satisfies 0.2 ≦ D / W ≦ 0.4.

[0042] As shown in Fig. 4, by adjusting the "vibration direction" in three directions ("vertical", "diagonal 45 degrees", "horizontal"), the "standard deviation of the charge height" and the "maximum powder ratio" could be suppressed with respect to the "comparative example (without vibration)". And by setting the "vibration direction" to the horizontal direction, it was confirmed that it is possible to level the charge formed in a ridge shape efficiently and alleviate the uneven distribution of the powder contained in the subsequent charge (the later charge).

[0043] Next, the influence of the "amplitude" on the "standard deviation of the charge height" and the "maximum powder ratio" was investigated. Fig. 5 shows the results of the investigation of the relationship between the "standard deviation of the charge height" and the "maximum powder ratio" and the "amplitude". Fig. 5 shows the vertical axis as the "standard deviation of the charge height" and the "maximum powder ratio", and the horizontal axis as "A / d".

[0044] In Fig. 5, "A / d" on the horizontal axis is the ratio of the amplitude A of the vibration applied to the charged material to the average diameter d of the molded product contained in the charged material, and is a value calculated by Equation (2). Fig. 5 shows an example investigated by changing "A / d". In this example, the vibration applied to the charged material by the vibration device was carried out with a frequency of 5 Hz, a "vibration position" value satisfying 0.2 ≦ D / W ≦ 0.4, and the vibration direction being the horizontal direction.

[0045] As shown in Fig. 5, by adjusting "A / d" to a value satisfying the range of 0.5 ≦ A / d ≦ 4.0, the "standard deviation of the charged material height" and the "maximum powder ratio" could be suppressed with respect to the "comparative example (without vibration)". And for the charged material formed in a mountain shape, by adjusting the amplitude A of the vibration oscillated from the vibration device so that 2.0 ≦ A / d ≦ 3.0, it was confirmed that it was possible to efficiently level the charged material formed in a mountain shape and relieve the uneven distribution of the powder contained in the charged material to be additionally charged (subsequent charged material).

[0046] Note that when A / d was less than 2.0, the charged material formed in a mountain shape could not be efficiently leveled. Also, when A / d exceeded 3.0, a phenomenon was confirmed in which the molded product contained in the charged material 6 vigorously collided with the furnace wall and pulverized.

[0047] Next, the influence of "frequency" on the "standard deviation of the charged material height" and the "maximum powder ratio" was investigated. Fig. 6 shows the results of an investigation of the relationship between the "standard deviation of the charged material height" and the "maximum powder ratio" and "frequency". Fig. 6 shows the vertical axis as the "standard deviation of the charged material height" and the "maximum powder ratio", and the horizontal axis as "frequency".

[0048] In Fig. 6, "frequency" is the frequency of the vibration applied to the charged material. Fig. 6 shows an example investigated by changing "frequency". In this example, the vibration applied to the charged material by the vibration device was carried out with an amplitude value such that A / d = 2.0, a "vibration position" value satisfying 0.2 ≦ D / W ≦ 0.4, and the vibration direction being the horizontal direction.

[0049] As shown in FIG. 6, by adjusting the "frequency" to a value that satisfies the range of 2 Hz or more and 16 Hz or less, the "standard deviation of the charged material height" and the "maximum powder ratio" could be suppressed with respect to the "comparative example (without vibration)". Then, by adjusting the frequency of the vibration oscillated from the vibration device so as to satisfy the range of 4 Hz or more and 12 Hz or less with respect to the charged material formed in a mountain shape, it was confirmed that it was possible to efficiently level the charged material formed in a mountain shape and alleviate the uneven distribution of the powder contained in the charged material to be additionally charged (subsequent charged material).

[0050] Note that when the frequency was less than 4 Hz, the charged material formed in a mountain shape could not be efficiently leveled. Further, when the frequency exceeded 12 Hz, a phenomenon was confirmed in which the molded product contained in the charged material 6 violently collided with the furnace wall and pulverized.

Explanation of Signs

[0051] 1 Charging chute 2 Charging gate 3 Diffusion part 4 Molded product layer 5 Powder layer 6 Charged material 7 Carbonization furnace body 8 Vibration device 11 Vertical carbonization furnace 12 Blast furnace raw material manufacturing device 10 Charging chute 20 Charging gate 30 Diffusion part 40 Molded product layer 50 Powder layer 60 Charged material 70 Carbonization furnace body 100 Vertical carbonization furnace A Amplitude (of vibration by the vibration device) D Height difference between the vibration device and the top of the charged material P Top (of the charged material) S Depth direction of the vertical carbonization furnace W Length in the depth direction of the vertical carbonization furnace d Average diameter of the molded product

Claims

1. A vertical retort furnace for producing raw materials for a blast furnace by retorting a charged material containing a carbonaceous substance, comprising: a retort furnace body for depositing the charged material therein; a charging chute for feeding the charged material into the retort furnace body; a vibration device provided on the furnace wall of the retort furnace body for imparting vibration to the charged material deposited inside the retort furnace body; A vertical retort furnace having the above components.

2. The vibration device is provided on the furnace wall at a position below the height position of the top of the charged material deposited inside the retort furnace body, and the ratio D / W of the height difference D from the upper end of the vibration device to the top of the charged material to the length W in the depth direction of the retort furnace body satisfies the relationship of the following formula (1). The vertical retort furnace according to Claim 1 is provided at a position satisfying the relationship. 0.2 ≦ D / W ≦ 0.4... (1)

3. The vibration device is provided at positions on the furnace walls facing each other across the top of the charged material in the depth direction of the retort furnace body. The vertical retort furnace according to Claim 1.

4. The vibration device is provided at positions on the furnace walls facing each other across the top of the charged material in the depth direction of the retort furnace body. The vertical retort furnace according to Claim 2.

5. A blast furnace raw material manufacturing apparatus for manufacturing blast furnace raw materials using the vertical retort furnace according to any one of Claims 1 to 4.

6. A blast furnace raw material manufacturing method for imparting horizontal vibration to the charged material by the vibration device using the blast furnace raw material manufacturing apparatus according to Claim 5.

7. The vibration device imparts vibration so that the ratio A / d of the amplitude A of the vibration imparted to the charged material to the average diameter d of the molded product contained in the charged material satisfies the relationship of the following formula (2). The blast furnace raw material manufacturing method according to Claim 6. 2.0 ≦ A / d ≦ 3.0... (2)

8. The vibration device imparts vibration to the charged material with the vibration frequency being 4 Hz or more and 12 Hz or less. The blast furnace raw material manufacturing method according to Claim 6.

9. The vibration device imparts vibration to the charged material with the vibration frequency being 4 Hz or more and 12 Hz or less. The blast furnace raw material manufacturing method according to Claim 7.

10. The blast furnace raw material manufacturing method according to Claim 8, wherein a preceding charged material is charged into the vertical retort furnace, vibration by the vibration device is imparted to the preceding charged material, and then a subsequent charged material is charged.

11. The method for producing raw materials for a blast furnace according to claim 9, wherein a preceding charge is charged into the vertical carbonization furnace, vibration by the vibration device is applied to the preceding charge, and then a subsequent charge is charged.

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