JP2793481B2 - How to load coke core into blast furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for charging a coke oven core into a blast furnace.

[0002]

2. Description of the Related Art If the circumferential balance of the rising gas is lost during the operation of a blast furnace, local drift of the reducing gas occurs, and shelves are suspended.
Slip, flooding, etc. occur frequently. In particular, when shelving occurs, the blowing pressure temporarily rises, and the flooding pressure causes a flooding phenomenon and a slugging phenomenon in which the charged material is blown up, thereby extremely deteriorating the furnace condition. On the other hand, in order to maintain stable operation even when the furnace condition changes, instead of simply dispersing the gas flow in the furnace, a part of the gas flow is concentrated in the furnace core, It is effective to perform the function of a safety valve against an increase in internal gas pressure, and coke is charged into the core of a blast furnace in operation in order to increase its central flow.

In a bellless blast furnace equipped with a parallel bunker type furnace top hopper, as shown in FIG. 2 schematically showing a method of charging a coke core, a lower part of a furnace hopper (H) is provided. A collecting chute (11) arranged inside the furnace top and having a vertical chute (12) at the center, and an inclined gutter shape arranged directly below the vertical chute (12) and whose lower end tilts and swivels under control The coke core is charged by the charging device (I) including the distribution chute (13).

[0004] In these coke oven core charging methods, coke (C) discharged from one of the furnace top hoppers (H) arranged in parallel is collected as shown in Fig. 2 (a). It is guided toward the furnace center axis (S) by the chute (11), dropped through the vertical chute (12) in the center, and guided into the furnace core by the lower distribution chute (13). There is
Conventionally, a method of tilting and swiveling the distribution chute for charging the mandrel and, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-6206, charging the mandrel without turning the distribution chute. And how to do so is known.

[0005] In the former method of charging the furnace core, (a) of FIG.
As shown in the figures and (b), the coke (C) dropped through the vertical chute (12) is transferred to the lower distribution chute (13).
By changing the position of the furnace core portion within a certain range by the tilting and swirling motions, the flow is induced to flow down, thereby forming the core coke (C ′) as shown in FIG.

In the latter method (JP-A-4-6206), the distribution chute is stopped so that the bottom surface of the distribution chute is located on the furnace top hopper side during coke discharge with respect to the center of the blast furnace. And, by setting the inclination angle of the distribution chute to an angle that can correct the coke fall trajectory, the coke flow discharged from the furnace top hopper and collided with the wall surface on the opposite surface side in the vertical chute is repelled, The blast furnace is guided to the center of the blast furnace by contacting the bottom surface of the distribution chute, whereby the coke is charged into the furnace core to form the core coke.

[0007]

Although the above bellless charging apparatus is provided inside the furnace top, it is advantageous in terms of furnace top pressure seal, but the conventional coke furnace core charging by this charging apparatus is performed. The method has the following problems.

That is, in the former method of charging a coke core, the core coke (C ') is likely to be formed with a distribution deviated with respect to the furnace central axis (S), whereby the central flow becomes unstable. . This is the coke discharged from the top hopper (H).
(C) is a vertical shoot as shown in Fig. 2 (a).
While colliding with the inner wall surface of (12) and hitting the bottom surface of the distribution chute (13), the direction of the flow is changed, but the distribution chute (13) is Since the turning motion is performed continuously, for example,
(b) As shown in the figure, depending on the turning position, the position of the coke (C) that collides with the inner wall of the vertical chute (12) and flows down and strikes against the bottom surface of the distribution chute (13) is slightly different. As a result, as a result, the regulation guiding effect of the distribution chute (13) on the flow of coke (C) fluctuates, and the radial down position of coke (C) at the specific turning position changes.

[0009] On the other hand, in the latter method (JP-A-4-6206), the coke flow colliding with the inner wall surface of the vertical chute and repelled is directed to the center of the furnace by hitting the bottom surface of the distribution chute. Therefore, although core coke having an axially symmetric distribution with respect to the furnace center can be formed, the flow-down position of the coke is specified at the furnace center, so that it is difficult to control the radial spread range of the formed core coke. Therefore, it is difficult to take measures in response to changes in the furnace conditions, changes in operating conditions, and the like. Furthermore, in order to stop the distribution chute at an angular phase corresponding to the position of the furnace top hopper for discharging coke, it is necessary to modify the sequence for controlling the position.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has a simpler and more practical configuration in which a uniform core coke that is axially symmetric with respect to the center of the furnace is mounted. It is an object of the present invention to provide a method for charging a coke core into a blast furnace which can be formed.

In order to achieve the above object, the present invention has the following constitution. That is, the method of charging the coke core into the blast furnace according to the present invention is to introduce coke discharged from the parallel bunker type furnace top hopper to a vertical chute at the center of the furnace through a collecting chute and drop the coke. placed below the vertical chute, code by the inclined gutter-shaped distribution chute tilting and pivoting movement of the lower end under the control
Charged by distributing flow down within a certain range of a furnace core section hex
At the time, the bottom of the distribution chute
Equipped with a deflector plate that inclines in a direction that narrows down below the surface
Only, the coke falls through a vertical chute, causes flow down along a bottom surface thereof by drift toward the bottom surface of the distribution chute by the polarized <br/> Nagareban, the dispensing shoe
The axle is symmetrical and uniform around the furnace center
Characterized that you charged form deadman coke.

[0012]

The coke discharged from the parallel bunker type top hopper is guided to the vertical chute in the center of the furnace via the collecting chute and dropped, and the coke is discharged from the inner wall of the vertical chute opposite the top hopper. And falls down in a direction toward the furnace top hopper, that is, in a specific direction. Then, as in the former prior art described above, when this coke flow is guided as it is by a swiveling inclined gutter-shaped distribution chute and flows down to the furnace core, a coke distribution chute falling through a vertical chute is provided. The position that hits the bottom changes depending on the turning position,
Along with this, the radial trajectory of the coke flow guided to the distribution chute and flowing down to the furnace core fluctuates depending on the turning position, and the furnace core coke charged and formed in the furnace core is biased with respect to the furnace center axis. It has a distribution.

On the other hand, in the present invention, the coke falling through the vertical chute is deflected toward the bottom surface of the distribution chute by the deflector plate attached to the upper open side of the distribution chute. The coke that falls with an imbalanced trace is hit at a fixed position on the bottom surface of the distribution chute and flows down along the bottom surface, whereby the radial locus of the coke flow flowing down to the core of the furnace is swirled. Irrespective of this, it is possible to stably charge the core coke axially symmetric with respect to the center of the furnace. Further, by changing the inclination angle of the distribution chute each time it is turned, it is possible to easily control the radial spread range of the core coke to be formed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for charging a coke core according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a raw material charging system of a bellless blast furnace, showing an embodiment of the present invention.

The bellless blast furnace (F) shown in FIG. 1 has a parallel bunker type top hopper (H) at the top of the furnace, and has a central part in the furnace top below the top hopper (H). A collecting chute (1) having a vertical chute (2) and a distribution gutter (3) arranged directly below the vertical chute (2) and having a lower end tilting and swiveling under control. It has a charging device (I). Further, in this embodiment, the inclined chute-shaped distribution chute arranged below the vertical chute (2) is used.
In (3), a drift plate (4) that is inclined in a direction narrowing downward with respect to the bottom surface is attached to an upper portion on the open side.

In this embodiment, coke (C) discharged from one of the furnace top hoppers (H) arranged in parallel is
It is guided toward the furnace center axis (S) by the collecting chute (1), dropped through the vertical chute (2) in the center, and the coke (C) is swirled by the lower distribution chute (3). As shown in Figs. (A) and (b), the position of the furnace core portion is sequentially changed within a certain range to induce the flow, and as a result, as shown in Fig. (C), the core coke (C ') Is formed. In addition, if necessary, the inclination angle of the distribution chute (3) is changed at each turn so that the coke
(C ′) is controlled in the radial expansion range.

Here, the coke (C) discharged from the furnace top hopper (H) is guided through the collecting chute (1) to the vertical chute (2) in the center, where the coke (C) is dropped.
Collides with the inner wall of the vertical chute (2) on the opposite side of the furnace top hopper (H) and is repelled, falling along a locus deviating in a specific direction. Then, as in the former prior art described above, the coke (C) flow is directly displaced and the distribution chute is swirled.
When it is guided by (3) and flows down to the furnace core, the distribution chute
The radial trajectory of the coke (C) flowing down from (3) fluctuates depending on the swirl position, and the core coke (C ') formed has a distribution that is deviated from the furnace center axis (S). But
In this embodiment, the coke falling from the vertical chute (2)
(C) Since the flow can be deflected toward the bottom surface by the deflector plate (4) attached to the distribution chute (3), the coke that falls with a deviated mark from the vertical chute (2)
(C) is brought into contact with a fixed position on the bottom surface of the distribution chute (3) and flows down along the bottom surface of the distribution chute (3). Irrespective of the temperature, the core coke (C ′) uniform and axially symmetric with respect to the furnace central axis (S) can be charged and formed. In addition, the drift plate (4) is made of the same material as the main body of the distribution chute (3) and may be flat, does not require a special shape and material, and does not require complicated procedures for mounting. Is also very simple.

As described above, the coke oven core charging method of the present embodiment has a simple and easy-to-implement configuration.
Axial symmetric and uniform core coke can be charged and formed at the center of the furnace to stabilize the central flow, and the extent of the core coke formed in the radial direction can be easily controlled to change furnace conditions and operating conditions. Blast furnace operation can be stably maintained.

[0019]

As described above, according to the method for charging a coke oven core according to the present invention, an axially symmetric and uniform oven core coke is charged at the center of the oven in a simple and practical configuration. Therefore, the blast furnace operation can be stabilized by stabilizing the central flow.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a coke oven core charging method according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory view of a conventional coke oven core charging method.

[Explanation of symbols]

(C)-coke, (C ')-core coke, (F)-blast furnace,
(H)-Furnace hopper, (I)-Charging device, (1)-Collecting chute, (2)-Vertical chute, (3)-Distribution chute, (4)-
Drift plate.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-6206 (JP, A) JP-A-2-166209 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) C21B 7/20 C21B 5/00

Claims (1)

(57) [Claims] 1. A coke discharged from a parallel bunker type furnace top hopper is guided to a vertical chute at the center of the furnace via a collecting chute and dropped, and is disposed below the vertical chute. When the coke is distributed down and charged into a certain area of the furnace core by the inclined chute-shaped distribution chute for tilting and swiveling, the coke is placed on the open side upper portion of the distribution chute and on the bottom surface of the distribution chute.
Install the drift plate which is inclined in a direction narrowing in downward against the coke to fall through the vertical chute and is drift toward the bottom surface of the distribution chute by the drift plate co
By rotating this distribution chute,
Coke oven ShinSoIri method that you charged form a uniform furnace core coke axisymmetric in mind the blast furnace, characterized.