JP2023122527A - Charging device, and raw material production method for blast furnace - Google Patents

Abstract

To provide a charging device and a raw material production method for a blast furnace which can charge a carbon-containing substance into a vertical dry distillation furnace while improving the distribution of the carbon-containing substance in the furnace.SOLUTION: A charging device for charging a carbon-containing substance into a vertical dry distillation furnace has: a cylindrical charging chute for sending and passing the carbon-containing substance; a diffusion part for diffusing the carbon-containing substance having being sent and passed through the charging chute in a direction of sending and passing the carbon-containing substance, and a diffusion direction vertical to the sending and passing direction; and a chute extension part which charges the carbon-containing substance having been diffused in the diffusion part into the vertical dry distillation furnace, and projects into the furnace.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a charging device for charging a carbon-containing material into a vertical carbonization furnace for producing coke, and a method for producing raw material for a blast furnace using the charging device.

In recent years, from the viewpoint of global warming, the steel industry is required to reduce the amount of CO ₂ gas generated. Therefore, reduction of fossil fuel usage is 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. In order to reduce the coke unit consumption, technology is being developed to use ferro-coke as a raw material for blast furnaces. Ferro-coke is produced by mixing coal with a certain amount of iron ore, agglomerating it, and then subjecting it to a dry distillation process to disperse fine metallic iron particles in the coke. It enhances reactivity.

A method using a vertical carbonization furnace has been proposed as a carbonization method for ferro-coke. Patent Document 1 discloses a vertical dry distillation furnace having a dry distillation 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 a molded product composed of a carbon-containing substance and an iron-containing substance into the vertical carbonization furnace through a charging chute, etc., and blowing heated gas in the carbonization zone. A dry distillation process for dry distillation of molded products to produce ferro-coke, a cooling process for cooling the ferro-coke by blowing in cooling gas provided in the cooling zone, and the furnace gas from the outlet at the top of the vertical dry distillation furnace. It has a furnace gas discharging process for discharging and a ferro-coke discharging process for discharging ferro-coke from the lower part of the cooling zone.

In the dry distillation process, the low temperature gas is blown in from the low temperature gas injection tuyeres in the middle part of the vertical dry distillation furnace, and the high temperature gas is blown in from the lower high temperature gas injection tuyeres.

Here, the low-temperature gas and the high-temperature gas are injected into the vertical dry distillation furnace so that the carbon-containing material supplied from the charging chute is directed in substantially the same direction as the depth direction of the vertical dry distillation furnace. Therefore, in order to effectively obtain the effect of heating and cooling the carbon-containing substance, the gas is blown in the depth direction of the vertical dry distillation furnace. In addition, in order to allow the low-temperature gas and the high-temperature gas to permeate the center of the vertical dry distillation furnace, it is necessary to suppress the dimension of the vertical dry distillation furnace in the depth direction. In order to increase the production of ferro-coke, it is necessary to increase the volume of the vertical carbonization furnace. It is necessary to make it larger than in the depth direction.

Based on the structural restrictions of this vertical dry distillation furnace, if the furnace width direction is made larger than the depth direction, the carbon-containing material supplied from the charging chute will be evenly distributed in the furnace width direction. must be distributed over Regarding a conveying device for conveying bulk materials such as minerals, Patent Document 2 discloses a conveying device that radially disperses the material by providing a material dispersion guide section toward the outlet side from the center in the conveying direction.

JP 2011-057970 A JP 2011-162271 A

However, in a vertical dry distillation furnace having a structure in which the size in the furnace width direction is larger than in the depth direction, the charging chute is arranged in the furnace width direction in order to evenly disperse the carbon-containing substances corresponding to the size in the furnace width direction. It is difficult to arrange many so as to correspond to all positions. In addition, even when a limited number of charging chutes are arranged in the furnace width direction, the carbon-containing substances released from the charging chutes are discharged into the charging material at the bottom of the vertical carbonization furnace. (Carbon-containing substance) becomes a charging distribution according to the angle of repose, and does not have a uniform charging shape. For this reason, when the molding (carbon-containing material) is charged into the furnace, there are areas where the molding (carbon-containing material) is abundant and areas where there is little molding (carbon-containing material) in the width direction of the furnace, and the gas flow in the furnace becomes uneven. There is a problem that it affects the carbonization of the molding (carbon-containing substance).

In addition, the powder generated by the collision between the moldings and the charging chute or the collision of the moldings with each other tends to segregate, and tends to concentrate on the charging device side at the bottom of the vertical dry distillation furnace. This is because most of the powder in the charge slips through the moldings and settles, and the charge is separated from the molding layer (upper layer) and the powder layer (lower layer) until it reaches the carbonization furnace. ) are separated into two layers. When 1 ton of molded material is charged, the maximum thickness of the charged material when entering the dry distillation furnace is about 150 mm, but the molded material is charged from a position higher than the powder existing below. Since the powder is put in, it tends to fly to a position distant from the charging port, while the powder in the lower layer falls in the vicinity of the charging port. Since the moldings form mountains according to their angle of repose, the distribution is relatively uniform. However, the powder is concentrated in one point and falls because the position of the powder is fixed by slipping between the moldings. In some cases, significant segregation occurs. A problem caused by powder segregation is that the gas flow in the furnace becomes uneven, which affects the carbonization of the molding. If the carbon-containing material cannot be charged uniformly in the width direction of the furnace, there will be places in the furnace where the powder pressure is locally high. Cracks occur.

Furthermore, in Patent Document 2, as a method for uniformly charging (conveying) materials, a material is distributed radially by providing a dispersion guide section having an inclined surface that descends radially from the center of the conveying path in the width direction toward the outlet side. However, the presence or absence of the dispersion guide does not affect the flight distance of the powder, and the installation of the dispersion guide cannot eliminate the powder segregation on the charging port side.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a charging apparatus and a method for producing raw materials for a blast furnace that can charge while improving the distribution of carbon-containing substances in the furnace of a vertical carbonization furnace. do.

The gist and configuration of the present invention for solving the above problems are as follows.
[1] A charging device for charging a carbon-containing material into a vertical dry distillation furnace, comprising: a cylindrical charging chute through which the carbon-containing material is passed; a diffusion section for diffusing the carbon-containing substance in a direction in which the carbon-containing substance is conveyed and in a diffusion direction perpendicular to the direction in which the carbon-containing substance is conveyed; and a chute extension part that is charged into a carbonization furnace and protrudes into the furnace.
[2] The method according to [1], further comprising a stepped portion downstream of the diffusion portion that provides a drop in the conveying direction toward the chute extension portion with respect to the carbon-containing substance diffused in the diffusion portion. charging device.
[3] The charging device according to [2], wherein the drop of the stepped portion is 30 mm or more and 60 mm or less.
[4] The length w of the chute extending portion in the transport direction satisfies the relationship of 0.27 ≤ w/W < 0.47, where W is the depth dimension of the vertical carbonization furnace [2] Or the charging device according to [3].
[5] The charging device according to [1], wherein the chute extension section extends in the depth direction of the vertical carbonization furnace in a comb shape.
[6] The charging device according to [5], wherein the chute extending portion has a width of a single comb blade and an interval between adjacent comb blades of 50 mm or more and 200 mm or less.
[7] The length x of the chute extending portion in the depth direction satisfies the relationship of 0.20 ≤ x/W ≤ 0.50, where W is the depth dimension of the vertical carbonization furnace, [5] or The charging device according to [6].
[8] A method for producing blast furnace raw material, comprising producing a blast furnace raw material using the charging apparatus according to any one of [1] to [7] and the vertical carbonization furnace.

According to the present invention, the carbon-containing substance can be charged while improving the distribution of the carbon-containing substance in the furnace of the vertical carbonization furnace.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective schematic diagram which shows an example of the charging apparatus in 1st Embodiment, and a vertical carbonization furnace. 1 is a schematic side view showing an example of a charging device and a vertical carbonization furnace in the first embodiment; FIG. It is a perspective schematic diagram which shows an example of the charging apparatus in 2nd Embodiment, and a vertical carbonization furnace. It is a side schematic diagram which shows an example of the charging apparatus in 2nd Embodiment, and a vertical carbonization furnace. FIG. 2 is a schematic side view showing an example of a charging device and a vertical carbonization furnace which are not provided with a stepped portion and a chute extension portion. FIG. 5 is a diagram showing the results of measuring the distribution of carbon-containing substances using a charging apparatus that does not have a stepped portion and a chute extending portion. FIG. 5 is a diagram showing the distribution measurement results of a carbon-containing substance using a charging device having a stepped portion and a chute extension. FIG. 5 is a diagram showing the relationship between the head of the stepped portion and the deviation of the mean value of the fine particle distribution of the carbon-containing material in the vertical carbonization furnace. FIG. 5 is a diagram showing the relationship between the height difference of the stepped portion and the deviation of the average value of the molded product distribution of the carbon-containing substance in the vertical carbonization furnace. FIG. 5 is a diagram showing measurement results of strength of ferro-coke in the second embodiment; It is an upper surface schematic diagram which shows an example of the modification of the charging apparatus in 2nd Embodiment. It is a perspective schematic diagram which shows an example of the charging apparatus in 3rd Embodiment, and a vertical carbonization furnace. It is an upper surface schematic diagram which shows an example of the charging apparatus in 3rd Embodiment, and a vertical carbonization furnace. FIG. 11 is a diagram showing the relationship between the width of a single comb blade in the chute extension portion and the maximum powder rate in the third embodiment. It is a figure which shows the relationship between the space|interval of comb blades of a chute extension part, and the maximum powder rate in 3rd Embodiment. FIG. 10 is a diagram showing the relationship between the ratio of the horizontal length of the chute extending portion to the depth dimension of the vertical dry distillation furnace and the maximum powder rate in the third embodiment.

Hereinafter, the present invention will be described through embodiments of the present invention, taking as an example the case of producing ferro-coke, which is a type of molded coke. Here, each drawing is schematic and may differ from the actual one. Moreover, the following embodiments are intended to exemplify devices and methods for embodying the technical idea of the present invention, and are not intended to limit the configurations to those described below. That is, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.

<First embodiment>
A configuration of a charging device 9 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 shows a schematic perspective view of a charging device 9 and a vertical carbonization furnace 20 . FIG. 2 shows a schematic side view of the charging device 9 and the vertical carbonization furnace 20. As shown in FIG.

The charging device 9 charges the molded carbon-containing material into the vertical dry distillation furnace 20 . The vertical carbonization furnace 20 carbonizes the carbon-containing material charged from the charging device 9 to produce coke. In order to produce ferro-coke in the vertical carbonization furnace 20, the charging device 9 vertically carbonizes a molding containing a carbon-containing substance (coal, etc.) and an iron-containing substance (iron ore, etc.), which are raw materials of ferro-coke. Furnace 20 may be charged.

The charging device 9 has a charging chute 1 , a diffusion section 2 and a chute extension section 3 . The charging chute 1 has a cylindrical shape through which the carbon-containing substance is passed. The charging chute 1 has an opening/closing part 1a such as a gate that can be opened/closed at the outlet. The diffusing portion 2 is in the shape of a quadrangular pyramid. The diffusion part 2 is arranged so that the top of the square pyramid is positioned below the outlet of the charging chute 1 . The diffusing section 2 diffuses the carbon-containing substance fed through the charging chute 1 in the feeding direction M and the diffusion direction N perpendicular to the feeding direction M. As shown in FIG. In the diffusing part 2 , the size of the bottom of the quadrangular pyramid is larger than the diameter of the charging chute 1 in the diffusing direction N. The diffusion direction N corresponds to the furnace width direction of the vertical carbonization furnace 20, as shown in FIG. As shown in FIG. 2, the chute extension part 3 is provided so as to extend and protrude into the vertical carbonization furnace 20 . The chute extension section 3 charges the carbon-containing material diffused in the diffusion section 2 into the vertical dry distillation furnace 20 .

In the first embodiment, the charging chute 1, the diffusion section 2, the chute extension section 3, and the vertical carbonization furnace are arranged from upstream to downstream along the conveying direction M of the carbon-containing material shown in FIG. 20 are provided in order. As shown in FIG. 2, the charging chute 1, the diffusion section 2, and the chute extension section 3 of the charging device 9 are inclined with respect to the depth direction P by an inclination angle θ. Therefore, the carbon-containing material fed through the charging chute 1 flows down along the charging chute 1, the diffusion section 2, and the chute extension section 3 due to the inclination having the inclination angle θ, and finally, It is charged into the vertical dry distillation furnace 20 .

The opening/closing portion 1a provided on the charging chute 1 is shown in a closed state in FIG. By closing the charging chute 1 by the opening/closing part 1a, the carbon-containing substance that has been sent through the inside of the charging chute 1 can be temporarily stored on the upstream side of the opening/closing part 1a. By closing the charging chute 1 by the opening/closing part 1a, for example, one batch of the carbon-containing material can be stored on the upstream side of the opening/closing part 1a. By opening the charging chute 1 from the closed state by the opening/closing portion 1 a , the carbon-containing substance stored inside the charging chute 1 is discharged toward the diffusion portion 2 .

With the configuration shown as the first embodiment, that is, the configuration in which the charging chute 1, the diffusion section 2, and the chute extension section 3 are provided in order, when the carbon-containing substance is conveyed through the charging chute 1, By having the chute extension part 3, the distribution of carbon-containing substances in the furnace of the vertical carbonization furnace can be improved. Further, the strength of the ferro-coke after carbonization can be improved as the distribution of carbon-containing substances in the furnace is improved.

<Second embodiment>
Next, with reference to FIGS. 3 and 4, the configuration of the charging device 10, which is a second embodiment of the present invention, will be described. Configurations that are the same as those shown in the first embodiment are assigned the same numbers in the drawings, and descriptions thereof are omitted. FIG. 3 shows a schematic perspective view of the charging device 10 and the vertical carbonization furnace 20. As shown in FIG. FIG. 4 shows a schematic side view of the charging device 10 and the vertical carbonization furnace 20. As shown in FIG. As shown in FIGS. 3 and 4, the charging device 10 according to the second embodiment has a configuration in which a step portion 5 is provided in comparison with the charging device 9 according to the first embodiment.

The stepped portion 5 is provided between the diffusion portion 2 and the chute extension portion 3 . The stepped portion 5 gives a drop in the conveying direction M toward the chute extending portion 3 to the carbon-containing substance diffused in the diffusing portion 2 downstream of the diffusing portion 2 . The drop is the distance between the top side of the stepped portion 5 and the bottom side on the downstream side in the feeding direction M. As shown in FIG.

In the second embodiment, a charging chute 1, a diffusion section 2, a stepped section 5, and a chute extension section 3 are arranged from upstream to downstream along the feeding direction M of the carbon-containing substance shown in FIG. , and a vertical dry distillation furnace 20 are provided in this order. The conveying direction M of the carbon-containing material is inclined by an inclination angle θ with respect to the depth direction P in the horizontal direction of the vertical dry distillation furnace 20 . As shown in FIG. 4, the charging chute 1, the diffusion section 2, the stepped section 5, and the chute extension section 3 of the charging device 10 are inclined with respect to the depth direction P by an inclination angle θ. Therefore, the carbon-containing material fed through the charging chute 1 flows down along the charging chute 1, the diffusion section 2, the stepped section 5, and the chute extension section 3 due to the inclination having the inclination angle θ. , and finally charged into the vertical carbonization furnace 20 .

Using the configuration shown in FIG. 4, which is the present embodiment, and the configuration without providing the stepped portion 5 and the chute extension portion 3 as shown in FIG. The distribution of carbon-containing substances in the depth direction P in the furnace was measured. The length w of the chute extending portion 3 was set to 500 mm, and the height difference of the stepped portion 5 was set to 40 mm. A charging device 10 similar to that used in the actual machine was used. The measurement was carried out by installing a recovery box that looked like a vertical carbonization furnace 20 on the delivery side of the charging chute 1 .

For the measurement, first, the weight of the carbon-containing material was measured at each position in the depth direction P at the bottom of the vertical dry distillation furnace 20 when the carbon-containing material was charged from the charging chute 1 for a certain period of time. Then, from the measured weight, the distribution for the granules was also determined. The weight measurement was performed by dividing the depth direction P of the bottom of the vertical dry distillation furnace 20 into eight regions and measuring the weight of the carbon-containing substance for each divided region. In addition, the distribution of the carbon-containing substance in the depth direction P of the bottom of the furnace was measured by setting the weight (charging amount) per batch of the carbon-containing substance charged from the charging chute 1 to 250 kg and 500 kg, respectively. went.

FIG. 6 shows the results of measuring the distribution of carbon-containing substances in the depth direction P in the furnace using a configuration (see FIG. 5) that does not have the stepped portion 5 and the chute extension portion 3 . FIG. 6( a ) shows the weight ratio of the carbon-containing material for eight regions in the depth direction P of the bottom of the vertical dry distillation furnace 20 . FIG. 6(b) shows the weight ratio of the fine particles of the carbon-containing material for eight regions in the depth direction P of the bottom of the vertical dry distillation furnace 20. As shown in FIG. In FIG. 6(a), the vertical axis represents the weight ratio (%) of the carbon-containing substance, and the horizontal axis represents eight regions in the depth direction P. ”. In FIG. 6(b), the vertical axis is the weight ratio (%) of the fine particles of the carbon-containing substance, and the horizontal axis is eight regions in the depth direction P, from "1" on the side of the charging device 10 to the opposite side of the charging device 10. Shown as side "8".

The weight ratio (%) of the fine particles of the carbon-containing substance is obtained by collecting the carbon-containing substance for each of eight regions in the depth direction P, sieving the collected carbon-containing substance, and using a sieve mesh of 20 mm or more as a molded product. , sieve meshes of less than 20 mm were classified as fine grains.

As shown in FIG. 6( a ), it was confirmed that the carbon-containing material was unevenly dispersed in the depth direction P when the stepped portion 5 and the chute extension portion 3 were not installed on the downstream side of the diffusion portion 2 . Further, as shown in FIG. 6(b), it was confirmed that when the step portion 5 and the chute extension portion 3 were not installed downstream of the diffusion portion 2, the fine grains were unevenly distributed on the charging device 10 side.

FIG. 7 shows the result of measuring the distribution of the carbon-containing substance in the depth direction P in the furnace using the configuration (see FIG. 4) provided with the stepped portion 5 and the chute extension portion 3 according to the present embodiment. . FIG. 7( a ) shows the weight ratio of the carbon-containing substance for eight regions in the depth direction P of the bottom of the vertical dry distillation furnace 20 . FIG. 7(b) shows the weight ratio of the fine particles of the carbon-containing substance for eight regions in the depth direction P of the bottom of the vertical dry distillation furnace 20. As shown in FIG. In FIG. 7(a), the vertical axis represents the weight ratio (%) of the carbon-containing substance, and the horizontal axis represents eight regions in the depth direction P. ”. In FIG. 7(b), the vertical axis is the weight ratio (%) of the fine particles of the carbon-containing material, and the horizontal axis is eight regions in the depth direction P, from "1" on the side of the charging device 10 to the opposite side of the charging device 10. Shown as side "8".

As shown in FIG. 7( a ), when the stepped portion 5 and the chute extension portion 3 are installed downstream of the diffusion portion 2 , it is confirmed that the carbon-containing substances are efficiently and almost evenly dispersed in the depth direction P. did it. Further, as shown in FIG. 7B, when the stepped portion 5 and the chute extension portion 3 are installed downstream of the diffusion portion 2, the fine particles are not unevenly distributed at a specific position, and are dispersed efficiently and almost evenly. It was confirmed that

Next, in the present embodiment shown in FIG. 4, the state of distribution of the carbon-containing material at the bottom of the vertical dry distillation furnace 20 was confirmed when the head of the stepped portion 5 was changed. Regarding the state of distribution, first, the weight ratio (%) of fine grains was calculated for each of the eight regions in the depth direction P of the bottom of the vertical dry distillation furnace 20 for each drop of the stepped portion 5 . Then, an average value, which is the average of the weight ratios (%) of the fine granules for each of the eight regions, was calculated. After that, the total average value of all the calculated average values for each head is calculated, and the maximum value of the deviation of the average value for each head from the total average value (referred to in the following description and FIG. Deviation (%)”) was calculated.

FIG. 8 shows the relationship between the head of the step portion 5 and the deviation of the carbon-containing material. In FIG. 8 , the vertical axis represents the deviation (%) of the carbon-containing substance, and the horizontal axis represents the drop (mm) of the step portion 5 . As shown in FIG. 8, considering that the allowable range of the deviation of the carbon-containing substance is 5% or less, when the drop of the stepped portion 5 is less than 30 mm or exceeds 60 mm, the carbon-containing substance It was confirmed that the deviation increased. In other words, it was confirmed that the distribution of the fine particles of the carbon-containing substance in the furnace can be made more efficient and substantially uniform by setting the drop of the stepped portion 5 to 30 mm or more and 60 mm or less.

Next, in this embodiment shown in FIG. 4, the distribution of carbon-containing substances in the bottom of the vertical dry distillation furnace 20 was confirmed when the length of the chute extension 3 was changed. Specifically, when the length w of the chute extension portion 3 in the transport direction M is w, and the depth dimension in the depth direction P of the vertical dry distillation furnace 20 is W, when the length w of the chute extension portion 3 is changed, The distribution of carbon-containing substances in the bottom of the vertical dry distillation furnace 20 was checked.

First, for each length w of the chute extension portion 3, the distribution is the value obtained by dividing the length w of the chute extension portion 3 by the depth dimension W of the vertical dry distillation furnace 20 (w/W: hereinafter referred to as “w/ W”) was calculated. Then, for each w/W, the average value of the weight ratio (%) of the moldings for each of the eight regions in the depth direction P of the bottom of the vertical dry distillation furnace 20 was calculated. Then, a total average value, which is the average of all the average values for each of the eight regions, was calculated. After that, the total average value of all the calculated total average values for each w/W is calculated, and the maximum value of the deviation of the total average values for each w/W from the total average value (described below and in FIG. 7, (referred to as "weight ratio deviation (%)") was calculated.

FIG. 9 shows the relationship between w/W and the weight ratio deviation. In FIG. 9, the vertical axis indicates the weight ratio deviation (%), and the horizontal axis indicates w/W (-(dimensionless number)). As shown in FIG. 9, considering that the allowable range of deviation of the weight ratio is 5% or less, when w/W is less than 0.27 or when w/W is 0.47 or more, the weight It was confirmed that the deviation of the ratio became large. In other words, by setting w/W to 0.27 or more and less than 0.47 (0.27≤w/W<0.47), the distribution of the carbon-containing substance moldings in the furnace can be more efficiently and substantially uniform. I was able to confirm what I can do.

Next, using the configuration shown in FIG. 4, which is the present embodiment, and the configuration without the stepped portion 5 and the chute extension portion 3 as shown in FIG. 20 and carbonized in the vertical carbonization furnace 20 to measure the strength of each ferro-coke produced. The measurement was performed by measuring DI ^150-15 (hereinafter referred to as "DI") as the strength of ferro-coke according to the rotational strength test method described in JIS _K2151 .

FIG. 10 shows the measurement results of the ferro-coke strength. As shown in FIG. 10, a carbon-containing material is charged into a vertical carbonization furnace 20 as a configuration in which a charging device 10 is provided with a stepped portion 5 and a chute extension portion 3 (the "present invention" in FIG. 10), and ferro-coke is produced. It was confirmed that the strength of the ferro-coke was efficiently improved by the production, compared to the configuration without the stepped portion 5 and the chute extension portion 3 (“Conventional” in FIG. 10).

Here, in the present embodiment, as shown in FIGS. 3 and 4, as an example of the charging device 10, a configuration in which a plurality of rows are arranged on one side in the depth direction P of the vertical dry distillation furnace 20 is shown. is not limited to That is, as shown in FIG. 11 , the charging device 10 may be arranged on both sides of the vertical dry distillation furnace 20 in the depth direction P of the vertical dry distillation furnace 20 .

<Third Embodiment>
Next, with reference to FIGS. 12 and 13, the configuration of a charging device 30 according to a third embodiment of the present invention will be described. Configurations that are the same as those shown in the first and second embodiments are assigned the same numbers in the drawings, and descriptions thereof are omitted. FIG. 12 shows a schematic perspective view of the charging device 30 and the vertical carbonization furnace 20. As shown in FIG. FIG. 13 shows a schematic top view of the charging device 30 and the vertical carbonization furnace 20. As shown in FIG. As shown in FIGS. 12 and 13, the charging device 30 according to the third embodiment has a configuration in which the stepped portion 5 is not provided as compared with the charging device 10 according to the second embodiment.

In the third embodiment, as shown in FIG. 12, a charging chute 1, a diffusion section 2, a chute extension section 3, and a vertical carbonization furnace 20 are arranged from upstream to downstream where the carbon-containing substance flows down. are set in order. Only the charging chute 1 is inclined at an inclination angle θ with respect to the depth direction P in the horizontal direction of the vertical carbonization furnace 20 . That is, only the direction in which the carbon-containing substance flows down inside the charging chute 1 corresponds to the conveying direction M. Further, as shown in FIG. 12, the diffusing section 2 is provided on a horizontal plane, and the chute extending section 3 is arranged so as to extend in the depth direction P in the horizontal direction.

As shown in FIGS. 12 and 13, in the third embodiment, the chute extending portion 3 has a comb tooth shape extending in the depth direction P in a comb tooth shape. In the chute extension part 3, the width L of the single comb blade and the interval D between the adjacent comb blades are 50 mm or more and 200 mm or less in order to more efficiently improve the effect of uniforming the dispersion of the carbon-containing substance in the vertical dry distillation furnace 20. It is desirable to When the width L of the single comb blade is less than 50 mm, the carbon-containing material passing over the comb blade tends to drop near the root of the comb blade (near the entrance of the vertical dry distillation furnace 20), and the vertical dry distillation furnace 20 is not allowed to fall. This is because the uniform distribution of the carbon-containing material in the inner bottom cannot be performed more efficiently. On the other hand, when the width L of the single comb blade exceeds 200 mm, the powder contained in the carbon-containing substance that has passed over the comb blade is moved to a position away from the charging device 30 in the furnace space of the vertical dry distillation furnace 20. This is because the carbon-containing substances are more likely to fly, and the carbon-containing substances cannot be uniformly dispersed in the bottom portion of the vertical dry distillation furnace 20 more efficiently.

If the interval D between the adjacent comb blades is less than 50 mm, it becomes difficult to supply the carbon-containing substance to the vicinity of the base of the comb blades, and even distribution of the carbon-containing substance at the bottom of the vertical dry distillation furnace 20 becomes more difficult. unable to do so effectively. On the other hand, if the distance D between the adjacent comb blades exceeds 200 mm, the carbon-containing substance passing over the comb blades tends to drop near the base of the comb blades, and the carbon content at the bottom of the vertical dry distillation furnace 20 is reduced. Even distribution of substances cannot be done more efficiently.

In the third embodiment, the value obtained by dividing the length x of the chute extension portion 3 in the depth direction P by the depth dimension W of the vertical dry distillation furnace 20 (x/W: hereinafter referred to as “x/W”) is 0. It is desirable to satisfy the relationship .20≤x/W≤0.50. When x/W is less than 0.20, the length x in the depth direction P of the chute extension part 3 becomes short, and the carbon-containing material can be uniformly dispersed in the vertical dry distillation furnace 20 more efficiently. because it will be gone. On the other hand, when x/W exceeds 0.50, even if the length x of the chute extending portion 3 in the depth direction P is increased, the effect exceeding the state of x/W=0.50 cannot be obtained. be. This is because most of the carbon-containing material passing over the comb blades falls into the vertical carbonization furnace 20 before reaching the tip of the shoot extension 3 in the state of x/W = 0.50. It is for

In order to increase the probability that the carbon-containing substance passing over the comb blades reaches the tip of the chute stretched portion 3, the cross-sectional shape of the chute stretched portion 3 should be a multi-stage shape (for example, if it is two-stage, it should be a convex shape). is preferred) or trapezoidal. However, in this case as well, it is desirable that the width L of the single comb blade is 50 mm or more and 200 mm or less.

The first to third embodiments have been described above as embodiments of the charging apparatus according to the present invention. In these embodiments, the case of producing ferro-coke as a raw material for blast furnaces has been described as an example, but the present invention is not limited to ferro-coke. That is, as a method for producing blast furnace raw materials for producing various types of coke, blast furnace raw materials may be produced using the charging apparatus and the vertical carbonization furnace according to the present invention.

Examples performed using the charging apparatus according to the present embodiment will be described below.

<Example 1>
Using the charging device 9 shown as the first embodiment (see FIG. 1) and the charging device 10 shown as the second embodiment (see FIG. 3), the charging weight (kg) to the vertical dry distillation furnace 20 The strength of ferro-coke was measured when In a comparative example, the strength of ferro-coke was measured when the charging weight to the vertical carbonization furnace 20 was changed using a configuration in which the stepped portion 5 and the chute extension portion 3 were not installed.

After the carbon-containing material is carbonized in the vertical carbonization furnace 20, the ferro-coke is sampled at 10 locations in the furnace width direction Q in the vertical carbonization furnace 20, and the strength of the ferro-coke is measured. Together, the maximum and minimum values of the intensity were confirmed. The strength was measured by measuring DI ¹⁵⁰ ₁₅ (hereinafter referred to as "DI") as the strength of ferro-coke according to the rotational strength test method described in JIS K2151.

Table 1 shows the results (invention examples 1 to 4) of measuring the strength of ferro-coke produced by using the charging apparatus 9 in the first embodiment. In addition, the results of measuring the strength of ferro-coke produced by using the charging apparatus 10 in the second embodiment (Invention Examples 5 to 12) are also shown. As shown in Table 1, Inventive Examples 1 to 4 having the chute extension portion 3 had a ferro-coke strength (maximum value and minimum value) of 72 or more under all conditions. That is, it was confirmed that the distribution of carbon-containing substances in the vertical carbonization furnace 20 could be improved, and the strength of ferro-coke after carbonization could be improved. In addition, in the invention examples 5 to 12 having the stepped portion 5 and the chute extension portion 3, the ferro-coke strength (maximum value and minimum value) was 77 or more under all conditions. It was confirmed that invention examples 5 to 12 have little variation in the maximum and minimum values, and can produce high-quality ferro-coke. That is, it was confirmed that the distribution of carbon-containing substances in the vertical carbonization furnace 20 can be efficiently improved, and the strength of ferro-coke after carbonization can be efficiently improved.

On the other hand, in Comparative Examples 1 to 4 in which the chute extension part 3 is not provided, the strength of ferro-coke is lower than that in Examples 1 to 12, and the strength of ferro-coke (maximum value and minimum value) varies greatly. did it.

<Example 2>
Next, a testing apparatus simulating the charging apparatus 30 (see FIG. 12) having the charging chute 1, the diffusion section 2, and the comb-shaped chute extension section 3 shown as the third embodiment was used. , the charge distribution in the depth direction P of the furnace bottom of the vertical dry distillation furnace 20 was investigated when the carbon-containing material, which is a molded product, was charged. The charging device 30 used in this embodiment has the same shape as that installed in the actual machine. Further, as the vertical dry distillation furnace 20 in this embodiment, a recovery box that looks like a dry distillation furnace is installed on the outlet side of the charging device 30 .

After charging a certain amount of carbon-containing material from the charging chute 1, the investigation was carried out by dividing the bottom of the collection box into 4 equal parts in the depth direction and 5 equal parts in the width direction (20 equal parts in total). The distribution of contained substances was investigated. Specifically, after recovering the carbon-containing substance for each of 20 equally divided regions, the recovered carbon-containing substance was sieved with a sieve mesh of 20 mm, and the upper sieve (diameter of 20 mm or more) was molded, and the lower sieve (diameter of 20 mm) was molded. less than) were sorted out as powder. Then, the weights of the molding and the powder were measured, and the "powder ratio" (the weight ratio (%) of the powder in the contents of each region) was calculated. Although the powder rate is obtained for every 20 equally divided regions, "maximum powder rate (%)" is shown as an index of powder segregation in FIGS. 14 to 16 described later. The maximum powder ratio is the maximum value of the powder ratio obtained by comparing the powder ratio of 20 equally divided regions.

FIG. 14 shows the result of investigating the relationship between the width L of the single comb blade of the chute extension portion 3 and the maximum powder rate. In FIG. 14 , the vertical axis represents the maximum powder ratio (%), and the horizontal axis represents the width L (mm) of the single comb blade of the chute extending portion 3 . The weight of the carbon-containing material charged into the charging chute 1 was 250 kg, the length x in the depth direction P of the single comb blade of the chute extension 3 was 500 mm (x/W: 0.33), and the interval D between the comb blades was 500 mm. was 100 mm. As shown in FIG. 14, in order to more efficiently improve the dispersibility of the powder, the width L of the single comb blade of the chute extending portion 3 was set to 50 mm in order to achieve the allowable maximum powder rate (40% or less). It has been confirmed that it is preferable to set the distance to 200 mm or less.

Next, FIG. 15 shows the result of investigating the relationship between the interval D between the comb blades of the chute extending portion 3 and the maximum powder rate. In FIG. 15 , the vertical axis represents the maximum powder ratio (%), and the horizontal axis represents the interval D (mm) between the comb blades of the chute extending portion 3 . 14, the weight of the carbon-containing substance charged into the charging chute 1 is 250 kg, and the length x in the depth direction P of the single comb blade of the chute extending portion 3 is 500 mm (x/W: 0.33), and the interval D between the comb blades was 100 mm. As shown in FIG. 15, in order to achieve the maximum allowable powder rate (40% or less) in order to improve the dispersibility of powder more efficiently, the interval D between the comb blades of the chute extension part 3 was adjusted to It was confirmed that the width L of the single blade is preferably 50 mm or more and 200 mm or less.

FIG. 16 shows the result of investigating the relationship between the ratio (x/W) of the length x in the depth direction P of the chute extending portion 3 to the depth W of the vertical dry distillation furnace 20 and the maximum powder rate. Further, the weight of the carbon-containing material charged into the charging chute 1 was 250 kg, and the width L of the single comb blade of the chute extending portion 3 and the interval D between the comb blades were both 100 mm. As shown in FIG. 16, in order to more efficiently improve the dispersibility of the powder, the chute extension part 3 with respect to the depth dimension W of the vertical dry distillation furnace 20 in order to achieve the maximum allowable powder rate (40% or less) It has been confirmed that it is preferable to set the ratio (x/W) of the length x in the depth direction P to 0.20 or more and 0.50 or less. In addition, the length x of the chute extension portion 3 in the depth direction P is further extended, and the ratio (x/W) of the length x of the depth direction P of the chute extension portion 3 to the depth dimension W of the vertical dry distillation furnace 20 is 0.5. It was confirmed that even if it exceeded 50, the effect in the case of x/W being 0.50 could not be improved more efficiently.

1 charging chute 1a opening/closing part 2 diffusion part 3 chute extending part 5 stepped part 9, 10, 30 charging device 20 vertical dry distillation furnace D interval between comb blades L width of single comb blade M feeding direction N diffusion direction P Depth direction Q Furnace width direction θ Tilt angle

Claims (10)

A charging device for charging a carbon-containing material into a vertical dry distillation furnace,
a cylindrical charging chute through which the carbon-containing material is passed;
a diffusion section that diffuses the carbon-containing substance fed through the charging chute in a feeding direction of the carbon-containing substance and a diffusion direction perpendicular to the feeding direction;
a chute extension part for charging the carbon-containing material after diffusion in the diffusion part into the furnace of the vertical carbonization furnace and protruding into the furnace;
A charging device with 2. The apparatus according to claim 1, further comprising a stepped portion downstream of said diffusion portion that provides a drop in said conveying direction toward said chute extension portion with respect to said carbon-containing substance diffused in said diffusion portion. input device. 3. The charging device according to claim 2, wherein the drop of the stepped portion is 30 mm or more and 60 mm or less. 3. The length w of the chute extending portion in the conveying direction satisfies the relationship of 0.27≦w/W<0.47, where W is the depth dimension of the vertical dry distillation furnace. charging device. 4. The length w of the chute extending portion in the conveying direction satisfies the relationship of 0.27≦w/W<0.47, where W is the depth dimension of the vertical dry distillation furnace. charging device. 2. The charging apparatus according to claim 1, wherein said chute extending portion extends in a comb-tooth shape in the depth direction of said vertical carbonization furnace. 7. The charging device according to claim 6, wherein the chute extending portion has a width of a single comb blade and an interval between adjacent comb blades of 50 mm or more and 200 mm or less. 7. The equipment according to claim 6, wherein the length x of the chute extending portion in the depth direction satisfies the relationship of 0.20≦x/W≦0.50, where W is the depth dimension of the vertical carbonization furnace. input device. 8. The apparatus according to claim 7, wherein the length x of the chute extending portion in the depth direction satisfies the relationship of 0.20≦x/W≦0.50, where W is the depth dimension of the vertical carbonization furnace. input device. A method for producing blast furnace raw material, comprising producing a blast furnace raw material using the charging apparatus according to any one of claims 1 to 9 and the vertical carbonization furnace.

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