JP2848243B2 - Method and apparatus for charging blast furnace bellless type raw material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of charging a specific raw material with high precision into a furnace center position when charging raw materials into a furnace from a furnace top bunker by a blast furnace bellless type raw material charging apparatus. The present invention relates to a method and an apparatus for charging a bellless type raw material for a blast furnace.

[0002]

2. Description of the Related Art In order to stabilize the condition of a furnace in a blast furnace and to operate it efficiently, it is important to appropriately control the distribution of gas flow rising in the furnace. Generally, in a blast furnace, when the rising gas in the furnace is made to flow centrally and the shape of the softening cohesive zone is maintained in an inverted V-shape, the furnace condition becomes stable and low Si operation becomes possible. On the other hand, in the blast furnace, when the air permeability in the center deteriorates, the rising gas flow shifts to the peripheral wall side, and as a result, a reduction reaction region appears earlier on the peripheral wall side, the softening cohesive zone becomes W-shaped, and the wind pressure fluctuation and It is said that the amount of heat loss increases, an unloading abnormality occurs, and the operation becomes unstable. The bellless charging device is a device for distributing and charging the raw material by continuously turning the distribution chute provided in the furnace from the furnace top bunker, and by changing the inclination angle of the distribution chute, the raw material distribution in the radial direction of the furnace is changed. It is said that it can be controlled, and it is easy to adjust the charging thickness of ore and coke.

[0003] The charging of the raw material into the furnace by the bellless type charging apparatus is performed by distributing the raw material previously stored in the furnace top bunker through a flow rate control gate located at the lower end of the bunker and installed in the blast furnace. It is carried out by introducing it onto a chute and causing the distribution chute to dump from its tip while turning. When charging the raw material into the furnace, set a dump pattern, and turn the distribution chute from the dump start point to the dump end point at a predetermined turning speed so that the trajectory of the tip coincides with the dump pattern. Is controlled so that the raw material is dumped along a predetermined dump locus and a predetermined raw material distribution in the furnace is formed at a predetermined discharge speed, but the coke layer thickness and the ore layer thickness in the peripheral portion of the furnace and the central portion are controlled. However, there is a problem that it is difficult to adjust the coke charging thickness in the central part because of the simultaneous control of the coke layer with the coke layer.

[0004] As a method of solving the drawbacks of the above-mentioned bellless type charging apparatus, when a coke layer and an ore layer are alternately laminated in a furnace, the amount of coke charged necessary for forming each coke layer is increased. After the part is charged in a layer over the entire cross section inside the furnace, the remaining fixed weighed coke is loaded vertically with a distribution chute on the layered coke in the furnace central part,
Method for forming coke layer (Japanese Patent Laid-Open No. 62-290809)
JP-A-64-65211, etc.), using a swivel chute having a cross-section of a cylindrical body, and the position of falling onto the charge from the outermost periphery in the furnace to the center of the furnace. A method in which the charged material is prevented from rolling on the slope of the mountain where the charged material is accumulated in the furnace by circling the entire range (Japanese Patent Laid-Open No. 4-308012), and the tilt angle of the distribution chute is set to the lower limit. Overrun the tip of the distribution chute by setting it to the limit angle or more, and make it turn idling at this position, or set the tilt angle of the distribution chute to a value equal to or more than the lower limit angle to overrun and turn the tip of the distribution chute. A method in which a predetermined raw material is surely charged to a central position in a furnace by fixing an angular position to be fixed to the same angle as that of a furnace top bunker of an upper material discharge target (Japanese Unexamined Patent Publication No.
No. 346609) has been proposed.

[0005]

The above-mentioned JP-A-62-29
No. 0809, Japanese Patent Application Laid-Open No. 64-65211, Japanese Patent Application Laid-Open No. 4-346609, and the like disclose a method of tilting and swiveling a distribution chute so that a raw material can be charged to an arbitrary position in a furnace. Since the distribution chute has a length of 3 to 5 m and is long, a stiffener (reinforcement beam) for preventing thermal deformation for preventing gutter-shaped opening expansion deformation due to heat influence in the furnace is distributed. It is essential to install one to three pieces in the longitudinal direction of the chute. For this reason, when charging the specific raw material into the center of the furnace, it is necessary to make the tilt angle of the distribution chute small and direct it to immediately below, so that the raw material is dumped directly from the furnace top bunker into the furnace, and dropped from the bunker. During the fall, the raw material has the disadvantage that it interferes with the stiffener for preventing thermal deformation installed in the longitudinal direction of the distribution chute and scatters and diffuses, thereby lowering the distribution accuracy. It is difficult to charge. Also, Japanese Patent Application Laid-Open No. 4-3
The method disclosed in Japanese Patent Publication No. 08012 discloses a method in which the distribution chute is formed to have a cross section of a cylindrical body to prevent the raw material from overflowing from the distribution chute when the distribution chute is directed immediately below or when swirling. Even if the distribution chute is pointed just below when charging the specific raw material, the raw material falling from the bunker interferes with the cylindrical part of the distribution chute and scatters, and the predetermined raw material is locally charged at the center of the furnace. Is difficult to do.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of a bellless type charging apparatus for a blast furnace, and to load a specific raw material into a furnace center from a furnace top bunker via a distribution chute. It is an object of the present invention to provide a method and an apparatus for charging a blast furnace bellless type raw material, which can prevent scattering and diffusion due to interference with a distribution chute and can precisely load a specific raw material into the furnace center.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object. As a result, in order to load the specific raw material only in the center of the furnace, the conventional method of sliding the raw material on the distribution chute and distributing it in the furnace was changed. By using a distributing chute to be dumped directly from the top bunker through the vertical chute on the distributing chute into the furnace.
The specific raw materials can be charged into the furnace center with high accuracy.
By improving the shape of the stiffener for preventing thermal deformation of the distribution chute, it has been found that the distribution chute can be formed into a body at the time of charging at the center of the furnace, and the present invention has been achieved.

That is, according to the present invention, in a bellless type raw material charging method for distributing raw materials contained in a furnace top bunker into a furnace via a distribution chute, a stiffener for preventing thermal deformation installed in the longitudinal direction of the distribution chute is provided. It is characterized in that the liner inner wall point at the tip of the distribution chute turns or stops at a tilt position beyond the center line of the furnace inner section, and specific materials are dropped and deposited directly from the furnace top bunker to the center of the furnace without passing through the distribution chute. And a bellless type raw material charging method for a blast furnace.

The present invention also relates to a distribution chute of a bell-less type material charging apparatus for distributing a raw material housed in a furnace top bunker into a furnace, wherein a liner inner wall point at a tip of the distribution chute tilts beyond a center line of a cross section in the furnace. A bellless type raw material charging apparatus for a blast furnace, wherein a gate-shaped thermal deformation preventing stiffener that does not interfere with a raw material falling from a furnace top bunker at a position is installed in a longitudinal direction of a distribution chute.

[0010]

In the method of the present invention, the stiffener for preventing thermal deformation, which is provided in the longitudinal direction of the distribution chute, has a gate shape, and the liner inner wall point at the tip of the distribution chute is turned or tilted at a tilting position exceeding the center line of the cross section in the furnace. Stopping and dropping the specific raw material directly from the furnace top bunker to the center of the furnace without passing through the distribution chute, the distribution chute forms when the specific raw material is charged into the center of the furnace, and the raw material due to interference with the distribution chute The scattering is eliminated, the specific raw material can be charged into the center of the furnace with high accuracy, and the distribution of the gas flow rising in the furnace can be appropriately controlled.

In the dispensing chute of the present invention, the liner inner wall point at the tip is inclined at a position beyond the center line of the cross section of the furnace.
By installing a portal-shaped heat deformation prevention stiffener in the longitudinal direction of the distribution chute that does not interfere with the raw material falling from the furnace top bunker, the specific raw material is formed into a body when it is charged into the furnace center, and the raw material falling from the furnace top bunker Directly falls and accumulates in the center of the furnace without sliding on the distribution chute, allowing specific raw materials to be charged into the center of the furnace with high accuracy, and appropriately controlling the gas flow distribution rising in the furnace. It becomes possible.

[0012]

【Example】

Embodiment 1 Hereinafter, details of the present invention will be described with reference to FIGS. 1 to 3 showing an embodiment. FIG. 1 is a schematic cross-sectional view of the top part of a bellless blast furnace of the present invention in which the bellless blast furnace of the present invention is installed in a center-feed type bellless blast furnace. FIG. 2 is a bellless blast furnace of a parallel bunker type. FIG. 3 is a perspective view of a distribution chute according to the present invention. In FIG. 1, 1 is a charging conveyor, 2 is an upper bunker at the top of the blast furnace 3, and
The raw material conveyed by the charging conveyor 1 is charged into the upper furnace top bunker 2. 4 is an upper gate provided below the upper bunker 2 and 5 is a lower bunker connected to the upper bunker 2 via the upper gate 4 and the upper seal valve 6.
The raw material charged into the upper bunker 2 is charged into the lower bunker 5 by opening the upper gate 4 and the upper seal valve 6. 7 is a flow rate adjusting gate provided below the lower furnace bunker 5, 8 is a lower seal valve, 9 is a vertical chute, 10 is a distribution chute, and 11 is a driving device of the distribution chute 10 by a turning motor and a tilting motor (not shown). The turning and tilting of the distribution chute 10 are controlled. The distribution chute 10 is shown in FIG.
As shown in the figure, when the distribution chute 10 is tilted close to vertical for charging the specific raw material into the furnace center, a portal-shaped stiffener for preventing thermal deformation 12, which is eccentric on the cross section so as not to interfere with the raw material flux, 13 and 14 are mounting bolts and nuts 15
The distribution chute 10 is fastened and fixed in the longitudinal direction of the main body, thereby preventing the distribution chute 10 from being thermally deformed.

When the raw materials charged in the lower furnace bunker 5 are uniformly charged into the furnace, the upper gate 4 and the upper seal valve 6 are closed to lower the lower furnace bunker 5 to a high furnace pressure. After that, the turning motor and the tilt motor (not shown) of the driving device 11 are started, the distribution chute 10 is controlled to the predetermined turning speed and the tilt angle, and the flow rate adjusting gate 7 is controlled.
Is adjusted to a predetermined opening, and the seal valve 8 is opened. As a result, the raw material in the lower furnace top bunker 5 falls onto the distribution chute 10 via the vertical chute 9 and tilts from the position indicated by the two-dot chain line shown in FIG.
To form a stock line.

When the specific raw material M ₁ charged in the lower furnace top bunker 5 is charged into the center of the blast furnace 3, the tilting motor (not shown) of the driving device 11 is started before the specific raw material M ₁ is charged. The tip position is the position of the tilt angle θ that exceeds the center line of the furnace inner section. In this case, for example, in a blast furnace in which the length L of the distribution chute 10 is 4.5 m, the tilt angle θ
Is 11 °, and in the blast furnace having the length L of the distribution chute 10 of 5.0 m, the tilt angle θ is set to 8 °, and the tilt angle θ is set according to the length L of the distribution chute 10. Next, a turning motor (not shown) of the driving device 11 of the distribution chute 10 is started,
When the distribution chute 10 is rotated at a predetermined speed, for example, about 8 rpm, the lower seal valve 8 is opened, and then the flow rate control gate 7 is controlled to a predetermined opening degree, whereby the specific raw material M ₁ in the lower furnace top bunker 5 can be obtained. Starts falling, and falls into the furnace via the vertical chute 9. Specific raw material M dropped into furnace
₁ is a distribution chute 10 and a stiffener 1 for preventing thermal deformation at the position of the distribution chute 10 as a raw material flux M.
The center charge 17 having a local deposition radius e at the center of the furnace on the furnace interior charge 16 with little interference with 2, 13, and 14
It is configured to fall and deposit. Note that the distribution chute 10 can drop and deposit the specific raw material M ₁ as a central charge 17 having a deposition radius e locally on the furnace interior charge 16 without the turning operation. By operating, the lower end of the distribution chute 10 functions as a so-called funnel-shaped guide in the form of a throttle, and has an effect of reducing scattering and diffusion of the raw material.

In FIG. 2, the raw material conveyed by the charging conveyor 1 is charged into the furnace top bunker 5a or 5b via a forked chute 22 having a switching damper 21 at the furnace top of the blast furnace 3. 6a, 6b are furnace top bunker 5a, 5b
The upper seal valve provided at the inlet of the furnace, 7a and 7b are the flow control gates provided at the outlet of the furnace bunker 5a and 5b, 8a and 8
b is a lower seal valve provided at the outlet of the furnace top bunker 5a, 5b, 9a, 9b is a vertical chute, 10 is a distribution chute,
Reference numeral 11 denotes a driving device for the distribution chute 10, which is configured so that the rotation and tilting of the distribution chute 10 are controlled by a turning motor and a tilting motor (not shown). As shown in FIG. 3, the distribution chute 10 is used for charging the specific raw material into the center of the furnace.
A gantry-shaped thermal deformation preventing stiffener 1 that is eccentric on the cross section so that it does not interfere with the raw material flux when tilted near vertical.
2, 13 and 14 are fastened and fixed in the longitudinal direction of the main body of the distribution chute 10 by mounting bolts and nuts 15 to prevent thermal deformation of the distribution chute 10.

When uniformly charging the raw material charged in the furnace top bunker 5a or 5b into the furnace, the upper seal valve 6a or 6b is closed to equalize the furnace top bunker 5a or 5b to a high furnace pressure. After that, the turning motor and the tilting motor (not shown) of the driving device 11 are started, the distribution chute 10 is controlled to the predetermined turning speed and the tilting angle, and the flow rate adjusting gate 7a or 7b is adjusted to a predetermined opening to seal the valve. Release 8a or 8b. As a result, the raw materials in the lower furnace bunker 5a or 5b are removed from the vertical chutes 9a and 9b.
The stock chute is formed by the distribution chute 10 which falls on the distribution chute 10 via the line and tilts from the two-dot chain line position shown in FIG. 2 to the position shown by the solid line.

When the specific raw material M ₁ charged into the furnace top bunker 5 a is charged into the center of the blast furnace 3, the tilting motor (not shown) of the driving device 11 is started before the specific raw material M ₁ is charged. The position is the position of the tilt angle θ exceeding the center line of the furnace inner section. In this case, for example, in the blast furnace having the length L of the distribution chute 10 of 4.5 m, the tilt angle θ is 11 °, and in the blast furnace having the length L of the distribution chute 10 of 5.0 m, the tilt angle θ is 8 °. The tilt angle θ is set according to the length L of the distribution chute 10. Next, distribution chute 1
0, the turning motor (not shown) of the driving device 11 is started, and when the distribution chute 10 is turned at a predetermined speed, for example, about 8 rpm, the lower seal valve 8a is opened, and then the flow rate adjusting gate 7a is controlled to a predetermined opening. If you do, furnace top bunker 5
specific raw material M ₁ in a starts falling, vertical chutes 9
a, fall into the furnace through 9b. At the position of the distribution chute 10, the specific raw material M ₁ falls into the raw material flux M at the position of the distribution chute 10 and hardly interferes with the distribution chute 10 and the stiffeners 12, 13, 14 for preventing thermal deformation, and the furnace interior material 16.
It is configured to be dropped and deposited as a central charge 17 having a deposition radius e locally at the upper central portion in the furnace.

With the above configuration, FIG.
When the specific raw material M ₁ charged in the lower furnace top bunker 5 shown in FIG. 4 is charged into the center of the blast furnace 3, the tilt motor (not shown) of the driving device 11 is activated and the distribution chute 1 is activated.
The tip position of 0 is the position of the tilt angle θ that exceeds the center line of the furnace inner section. In this case, for example, in the blast furnace having the length L of the distribution chute 10 of 4.5 m, the tilt angle θ is 11 °, and in the blast furnace having the length L of the distribution chute 10 of 5.0 m, the tilt angle θ is 8 °. The tilt angle θ is set according to the length L of the distribution chute 10. Next, the turning motor (not shown) of the driving device 11 of the distribution chute 10 is started, and when the distribution chute 10 is rotated at a predetermined speed, for example, about 8 rpm, the lower seal valve 8 is opened, and then the flow rate adjusting gate 7 is opened.
Is controlled to a predetermined opening degree, the specific raw material M ₁ in the lower furnace top bunker 5 starts falling, and falls into the furnace via the vertical chute 9. The specific raw material M ₁ that has fallen into the furnace becomes a raw material flux M at the position of the distribution chute 10, and
In addition, it can be dropped and deposited as a center charge 17 having a deposition radius e locally at the center of the furnace on the furnace interior charge 16 with little interference with the stiffeners 12, 13, and 14 for preventing thermal deformation.

The furnace top bunker 5a or 5b shown in FIG.
When the specific material M ₁ was charged to b charged into the center portion of the blast furnace 3, start the tilting motor (not shown) of the driving device 11 prior to it, the tip position of the distribution chute 10 is a furnace sectional center line The position of the tilt angle θ that has been exceeded. in this case,
For example, in the blast furnace having the length L of the distribution chute 10 of 4.5 m, the tilt angle θ is 11 °. In the blast furnace having the length L of the distribution chute 10 of 5.0 m, the tilt angle θ is 8 °. Is set in accordance with the length L of the tilt angle. Next, a turning motor (not shown) of the driving device 11 of the distribution chute 10 is started, and when the distribution chute 10 is rotated at a predetermined speed, for example, about 8 rpm, the lower seal valve 8a or 8b is opened, and then the flow rate adjusting gate 7a. or by controlling the 7b to a predetermined opening degree, a specific raw material M ₁ in the furnace top bunker 5a or the 5b starts falling, vertical chutes 9
a, fall into the furnace through 9b. At the position of the distribution chute 10, the specific raw material M ₁ falls into the raw material flux M at the position of the distribution chute 10 and hardly interferes with the distribution chute 10 and the stiffeners 12, 13, 14 for preventing thermal deformation, and the furnace interior material 16.
It can be dropped and deposited as a central charge 17 having a deposition radius e locally on the upper furnace center.

Example 2 As a conventional example before the present invention was carried out, raw coke COKE was dropped into a blast furnace via a vertical chute, and the length L was 4.
The 5 m distribution chute was turned 14 times at about 8 rpm while tilting from the furnace wall toward the core to form a stock line. Thereafter, the specific raw material COKE is dropped and deposited at the center of the furnace in the blast furnace via a vertical chute.
As shown in the figure, the distribution chute 4 having the length L of 4.5 m.
1 Set tilt angle theta ₁ beyond the furnace section centerline 14 °, stiffeners preventing the most upstream thermal deformation of the distribution chute 41 42 removal, other thermal deformation prevention stiffeners 43,
Reference numeral 44 designates a conventional chute 41 at the installation position, and transfers 10% of the coke weight to a vertical chute 45 for the purpose of solely controlling the weight ratio (O / C) of ore to the coke in the center of the specific raw material COKE. The distribution chute 41 was rotated twice at about 8 rpm to drop and deposit at the center of the furnace. Further, the raw ore ORE was dropped into the blast furnace through a vertical chute, and the length L was 4.5 m.
Was tilted from the furnace wall toward the core and turned 14 times at about 8 rpm to form a stock line. Accordingly After the distance from the core of the blast furnace and the raw material coke COKE, a deposition radius e ₁ during a specific material COKE charged with the layer thickness of the ore ORE was determined by furnace top profilometer. FIG. 7A shows the result.

As an embodiment of the present invention, raw coke COKE is dropped into a blast furnace through a vertical chute, and a length L
Was rotated at about 8 rpm 14 times while tilting a 4.5 m distribution chute from the furnace wall toward the core to form a stock line. Thereafter, in order to drop and deposit the specific raw material COKE in the center of the furnace through the vertical chute in the blast furnace, as shown in FIGS. 5 and 6, the distribution chute 51 having the length L of 4.5 m is placed in the center of the cross section of the furnace. Tilt angle θ beyond line
₂ is set to 11 °, and the stiffeners 52 and 53 for preventing thermal deformation upstream of the distribution chute 51 are formed into gates, and the stiffener 54 for preventing thermal deformation at the most downstream uses the distribution chute 51 at the conventional installation position and is specified. For the purpose of sole control of the weight ratio (O / C) of ore to coke in the core portion of the raw material COKE, 10% of the coke weight is dropped into the blast furnace via the vertical chute 55, and the distribution chute 51 is moved at about 8 rpm to 2
It was swirled and dropped and deposited at the center of the furnace. Further, the raw ore ORE is dropped into the blast furnace via the vertical chute, and the distribution chute having a length L of 4.5 m is turned 14 times at about 8 rpm while tilting from the furnace wall toward the core to form a stock line. Was. After that, the distance from the blast furnace core and the raw coke COKE,
The layer thickness of the ore ORE and the deposition radius e ₂ when the specific raw material COKE was charged were measured. The result is shown in FIG.

As shown in FIG. 7 (b), in the case of the embodiment in which the specific raw material COKE is dropped and deposited at the center of the furnace using the apparatus of the present invention, the deposition radius e ₂ when the specific raw material COKE is charged. Is about 1.5 m, whereas in the conventional case,
As shown in FIG. 7 (a), depositing a radius e ₁ during a particular feed COKE charging is over 2m. This is because when the specific raw material COKE is dropped into the blast furnace using the apparatus of the present invention,
As shown in FIG. 5A, a chute tilt angle at which the raw material flux M having an approximate cylinder equivalent cross-sectional diameter d falling into the furnace via the vertical chute 55 does not interfere with the liner inner wall point P at the tip of the distribution chute 51. While setting θ ₂ to 11 °,
The plurality of thermal deformation preventing stiffeners 52 and 53 installed in the longitudinal direction of the distribution chute 51 are eccentric on the cross section so as not to interfere with the raw material flux M, and the AA cross section and BB of FIG. As shown in FIGS. 6 (a) and 6 (b) corresponding to the cross section, the material flux M falling through the vertical chute 55 is distributed by the portal chute so that the distribution chute 51 and the thermal deformation preventing stiffeners 52 and 53 are formed. , 54 without interfering with each other, and dropped and deposited at the center of the furnace.
On the other hand, in the conventional example, as shown in FIG. 4, the raw material flux M of the specific raw material COKE interferes with the stiffener 42 for preventing thermal deformation in the middle, and is dispersed into the raw material main flow Ma and the raw material branched flow Mb. It is considered that the raw material main stream Ma slid near the tip of the distribution chute 41 eccentrically fell, and did not fall and accumulate on the central portion of the furnace, but rather fluctuated, and was largely diffused and deposited around the concentric circle. Further, in order to investigate a change in the deposition radius e at the time of charging the specific raw material COKE before and after the implementation of the present invention over time, the distribution chute according to the present invention was used on a 1/30 temporary cold day in FIG. The distribution chute having the structure shown in FIG. 3 was replaced. Then, the specific raw material CO before and after the present invention is measured by the furnace top profile meter.
The change in the deposition radius e when the KE was charged was measured. FIG. 8 shows the result. Furthermore, a change in the gas utilization ratio ηCO at a distance from the reactor core before and after the present invention was determined.
FIG. 9 shows the result. The gas utilization rate ｛ηCO = C
The value of O ₂ / (CO + CO ₂ )} is calculated from the gas composition in the blast furnace.

As shown in FIG. 8, after replacement with the distribution chute having the structure shown in FIGS. 5 and 6 of the present invention, the deviation of the deposition radius e at the time of charging the specific raw material COKE becomes smaller than before the replacement. This indicates that the specific raw material COKE could be charged and deposited at the center of the furnace with high accuracy. Further, as shown in FIG. 9, the gas utilization ratio η of the core after replacement with the distribution chute having the structure shown in FIGS.
CO is getting lower and the specific raw material COKE
Of the ore with respect to the coke in the reactor core (O / C) was reduced, the permeability of the coke in the reactor core was improved, and the gas rising in the reactor core was improved. Is reduced in oxidation reaction due to suppression of contact with ore, and rises as reducing CO gas. As a result, there is no danger that the coke in the core undergoes a solution loss reaction of CO ₂ + C → 2CO and becomes finer, a stable central flow is formed, and the softened cohesive zone is maintained in an inverted V-shape.
This indicates that the furnace condition of the blast furnace was more stable.

[0024]

As described above, according to the present invention,
The stiffener for preventing thermal deformation of the distribution chute is gate-shaped, and while maintaining the mechanical structure, the tip of the distribution chute is swiveled at a tilt position that exceeds the center line of the cross-section inside the furnace. Can be dropped and deposited only on the core without scattering and dispersing to the periphery. As a result, specific raw materials such as large coke and large ore can be deposited in the center of the blast furnace, and the center of the furnace can be activated and stable central gas flow can be achieved, and the stable operation of the blast furnace can be continued. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a furnace top when a bellless type raw material charging apparatus of the present invention is installed in a center feed type bellless type blast furnace. It is a perspective view of a distribution chute of the present invention.

FIG. 2 is a schematic cross-sectional view of the furnace top when the bellless type raw material charging apparatus of the present invention is installed in a parallel bunker type bellless type blast furnace.

FIG. 3 is a perspective view of the distribution chute of the present invention.

FIG. 4 is a cross-sectional view illustrating a configuration of a conventional distribution chute used in Example 2 and a material flux.

FIGS. 5A and 5B show the arrangement of the distribution chute and the flow of the raw material flux in the present invention. FIG.
(B) is a front view.

6 is a cross-sectional view of each part of FIG. 5 (a), and FIG.
-A cross-sectional view, (b) is a BB cross-sectional view, and (c) is a CC cross-sectional view.

FIG. 7 shows the distance from the core of the blast furnace, the raw coke COKE and the ore O measured by the top profile meter in Example 2.
It shows the RE layer thickness and the deposition radius e at the time of charging the specific raw material COKE, wherein (a) is a conventional example before the present invention is implemented, and (b) is an example after the present invention is implemented.

FIG. 8 is an explanatory view showing the time course of the coke radius of the furnace center before and after the implementation of the present invention in Example 2.

FIG. 9 is a graph showing the relationship between the distance from the reactor core and the gas utilization rate ηCO before and after the implementation of the present invention in Example 2.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Charge conveyor 2 Upper furnace bunker 3 Blast furnace 4 Upper gate 5 Lower furnace bunker 5a, 5b Furnace bunker 6, 6a, 6b Upper seal valve 7, 7a, 7b Flow control gate 8, 8a, 8b Lower seal valve 9 , 9a, 9b, 45, 55 Vertical chutes 10, 41, 51 Distribution chutes 11 Drives 12, 13, 14, 42, 43, 44, 52, 53, 5
4 Stiffener for preventing thermal deformation 15 Bolts and nuts 16 Furnace interior charge 17 Center charge 21 Switching damper 22 Bifurcated chute

Claims (2)

(57) [Claims] 1. A bellless type raw material charging method for distributing raw materials contained in a furnace top bunker through a distribution chute in a furnace, wherein a stiffener for preventing thermal deformation installed in a longitudinal direction of the distribution chute has a portal shape, A blast furnace characterized in that the liner inner wall point at the tip of the distribution chute is turned or stopped at a tilt position beyond the center line of the cross section of the furnace, and the specific raw material is dropped and deposited from the furnace top bunker directly to the center of the furnace without passing through the distribution chute. Bellless type material charging method. 2. A distribution chute of a bell-less type material charging apparatus for distributing a raw material accommodated in a furnace top bunker into a furnace, wherein a liner inner wall point at a tip of the distribution chute is tilted at a tilting position exceeding a center line of a cross section in the furnace. A bellless type raw material charging apparatus for a blast furnace, wherein a portal-shaped heat deformation preventing stiffener that does not interfere with the raw material falling from the top bunker is installed in the longitudinal direction of the distribution chute.