JPH0426431Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a furnace top charging equipment for charging raw materials such as coke and iron ore into the furnace of a vertical furnace such as a blast furnace.

[Prior Art] Bell-less center feed type charging equipment has been developed in recent years as a top charging equipment for blast furnaces.
An example is shown in FIG.

This equipment has an upper hopper (furnace top popper) 2 and a lower hopper 3 arranged in series above the reactor body 1 along the core extension line, and above the upper hopper 2 along the radial direction of the upper hopper 2. The raw material charged from a charging conveyor 4 arranged along the furnace is moved downward approximately along the center line of the furnace and supplied into the furnace body 1.

A distribution chute 5 is provided above the upper hopper 2 to receive the raw material input from the charging conveyor 4 and input it into the upper hopper 2. This distribution chute 5d has a receiving port 5a opening upward for receiving the raw material, and an input port 5a downwardly opening.
A guide tube 5a with a drilled hole is formed obliquely to the axis of the upper hopper 2. The distribution chute 5 is rotated about the axis of the upper popper 2 by a drive device (not shown).

Further, a raw material cutting gate 6 is provided at the lower end discharge port of the upper hopper 2, and a raw material cutting gate 6 is provided at the lower end discharge port of the lower hopper 3 to adjust the flow rate of the raw material discharged from the lower hopper 3 to the furnace body 1. A raw material flow rate adjustment gate 7 is provided.

In order to charge raw materials into the furnace body 1 using such furnace top charging equipment, the raw materials are first conveyed above the distribution chute 5 by the charging conveyor 4, and then the distribution chute 5 is The charging conveyor 4 is rotated and inserted into the receiving port 5a of the distribution chute 5.
Input raw materials from The raw material falls into the upper hopper 2 from the input port 5b of the distribution chute 5 which is in a rotating state, and thereby the raw material is temporarily stored in the upper hopper 2.

Next, the cutting gate 6 is opened to allow the raw material in the upper hopper 2 to fall into the lower hopper 3. When this dropping operation is completed, the cutting gate 6 is closed, and the raw material flow rate adjustment gate 7 is then turned on to drop the raw material into the lower hopper. 3 into the inside of the furnace body 1. With the above steps, the raw material is charged into the furnace body 1,
By repeating this procedure, raw materials are sequentially introduced into the furnace body 1.

[Problems to be solved by the invention] By the way, in conventional charging equipment, the raw material vibrates up and down on the charging conveyor 4, and due to this vibration action, the fine particles in the raw material move downward and the coarse particles move downward. Polarization occurs due to the difference in particle size, which causes the particles to accumulate upward. When the raw material is fed into the distribution chute 5 from the charging conveyor 4 in this state, the fine particles are brought closer to each other due to the difference in the horizontal inertial force generated in the raw material.
Coarse particles fall far away. Then, when the raw material is fed into the upper hopper 2 from the distribution chute 5 with the fine particles and coarse particles separated,
Even in the upper hopper 2, the particles are deposited in a polarized state due to the difference in particle size. In other words, fine particles and coarse particles are not mixed and are deposited non-uniformly.

Furthermore, when the raw material is fed into the rotating distribution chute 5 while being subjected to inertia force in the horizontal direction, the flow of the raw material passing through the distribution chute 5 is caused by the direction of the guide pipe 5c of the distribution chute 5. Conditions change, which affect the state of material deposition in the upper hopper 2.

That is, when the guide pipe 5c of the distribution chute 5 faces in the raw material conveying direction, the raw material falls far away while maintaining the momentum of being introduced from the charging conveyor 4; When facing the opposite side to the conveyance direction of the raw material, the input force is attenuated by colliding with the guide tube 5c, and falls near the center of the upper hopper 2. Furthermore, although the distribution chute 5 is rotating, when the guide tube 5c faces the charging conveyor 4 side, the raw material does not pass smoothly, so a large amount accumulates in the distribution chute 5. Therefore, the amount of raw material falling on the charging conveyor 4 side is larger than that on the opposite side. As a result, the state of depositing the raw material in the upper hopper 2 has become non-uniform.

In addition, among the raw materials to be charged, coke and iron ore have different flow characteristics, and coke is usually more difficult to flow than iron ore. It is set so that it is discharged toward the center of the receiving port 5a of the distribution chute 5 without causing any damage. For this reason, when coke and iron ore are separately charged, the flow rate of iron ore from the input port 5b becomes large, and there is a tendency for the iron ore to be unevenly distributed.

In addition, in order to charge the raw materials, a method is used in which coke and iron ore are separately charged in several batches, but in this case, in order to obtain uniform distribution, the rotation speed of the distribution chute 5 must Since it is necessary to be able to select arbitrarily, the equipment cost is high.

When the raw materials were sequentially introduced into the lower hopper 3 and the furnace body 1, the deposition state in the upper hopper 2 tended to remain almost unchanged. Therefore, the unevenness of the deflection and charging distribution in the upper hopper 2 will eventually affect the furnace body 1.
Countermeasures were needed because this leads to uneven and non-uniform charge distribution within the reactor, which in turn has a negative effect on the reaction within the reactor.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems. A receiving collecting hopper is arranged, and a guide surface is formed on the inner surface of the collecting hopper, with which the raw material supplied from the charging conveyor collides and drops the raw material through the discharge port toward the center of the raw material receiving opening of the distribution chute. , the collecting hopper is characterized in that a gate is provided at the outlet of the collecting hopper to adjust the opening size of the outlet.

[Operation] The raw material supplied from the charging conveyor collides with the guide surface formed on the inner surface of the collecting hopper, thereby canceling the penetrating force of the raw material in the conveying direction by the charging conveyor, that is, the force of the raw material jumping out. , the raw material is separated into fine particles and coarse particles,
The mixture is mixed again and guided by the guide surface to the discharge port.

If the opening size of this outlet is set to an appropriate size using a gate depending on the type and amount of raw materials input, the flow rate of the raw materials falling from the outlet will be controlled so that the condition of the mixed raw materials is not impaired. It is held in place and discharged into the center of the material receptacle of the distribution chute.

Therefore, as the distribution chute rotates,
Even if the relative relationship between the guiding direction of the raw material in the distribution chute and the direction in which the raw material is introduced by the charging conveyor changes, the raw material at the time of discharge from the distribution chute will be the same as when it was input from the charging conveyor. Regardless of the penetration force, the raw material is fed into the top hopper from the distribution chute. As a result, the charging distribution of the raw material in the furnace top hopper becomes uniform.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In this embodiment, a collecting hopper is arranged between the charging conveyor 4 and the distribution chute 5 in the charging equipment shown in FIG. 5, and this collecting hopper will be explained below. Components common to those in FIG. 5 are denoted by the same reference numerals and their explanations will be omitted.

In these figures, what is indicated by the reference numeral 10 is the collection hopper. The collecting hopper 10 has a rectangular receiving port 10a for receiving the raw materials supplied from the charging conveyor 4, and a receiving cylinder portion 10A formed so that the opening thereof gradually narrows downward. It consists of a discharge pipe part 10B which is integrally provided below the receiving cylinder part 10b and whose lower end opening serves as a discharge port 10b for discharging the raw material. As shown in FIG. 2, the edge of the discharge port 10b is
It curves convexly downward.

Then, this collecting hopper 10 has a receiving port 10.
a and the center of the outlet 10b is the distribution chute 5
The distribution chute 5 is disposed above the distribution chute 5 so as to be located on the axis of the distribution chute 5.

The receptacle 10a of the collecting hopper 10 is formed to be high on the side in the direction in which the raw material is ejected so as to reliably receive the raw material inputted from the charging conveyor 4 without leaking, and the inner surface of the receptacle cylindrical portion 10A that forms this part is as follows. The surface was formed into an appropriate slope so that the raw materials discharged from the charging conveyor 4 collided with each other, and the collided raw materials were guided to the discharge port 10b and directed from the discharge port 10b toward the center of the receiving port 5a of the distribution chute 5. This is the guide surface 10c.

Further, on this guide surface 10c, a plurality of horizontally arranged rods 11 (four rods in this case) having a rectangular cross section are lined up in the discharge direction. As a result, the discharge direction of the raw material on the guide surface 10c is uneven, so that the input raw material is appropriately stagnated here and its falling speed is slowed down.

The discharge port 10b of the collecting hopper 10 is provided with a pair of gates 12 for adjusting the opening size of the discharge port 10b. As shown in FIG. 2, these gates 12 are curved along the shape of the discharge port 10, and are arranged at the discharge port 10b at a predetermined distance apart in the curved direction.

Arms 13 extending upward and pivotally supported by the discharge pipe portion 10B of the collecting hopper 10 are fixed to both side end surfaces of these gates 12. connected. The tip of one arm 14 is connected to a rod 15a of a cylinder 15.

As a result, gates 12, 12, cylinder 15
When the rods 15a expand and contract, they move closer to each other and move away from each other in conjunction with each other by the link mechanism 14.
That is, the opening size of the discharge port 10b of the collecting hopper 10 is made wider or narrower by the gates 12, 12.

Next, the operation of the charging equipment configured as described above will be explained.

Prior to charging raw materials, by operating the cylinder 15 and adjusting the amount of movement of the gates 12, 12, the opening size of the discharge port 10b formed by the gates 12, 12 can be adjusted depending on the type of raw material (coke, coke, etc.). Iron ore, etc.) or a suitable material according to the input amount, and then the raw material is charged into the receiving port 10a of the collecting chute 10 by the charging conveyor 4.

When the raw material is charged from the charging conveyor 4, the raw material collides with the guide surface 10c of the collecting hopper 10, and then slides down the guide surface 10c.

At this time, the penetrating force in the conveying direction of the raw material charging conveyor 4, that is, the force of the raw material jumping out, is canceled out, and the raw materials separated into fine powder and coarse powder are mixed again. In particular, since the guide surface 10c has an uneven shape due to the plurality of rods 11, the falling speed is stagnant, so that the raw materials are mixed effectively.

When the raw material slides down the raw material guide surface 10c, it is guided to the lower discharge port 10b. Since the opening size of the discharge port 10b is limited by the gates 12, the flow rate at which the raw material that has reached the discharge port 10b falls from the discharge port 10b causes deflection and separation of the raw material. Not maintained in proper condition. The falling raw materials are collected only into components along the axial direction of the collecting hopper 10, fall substantially vertically downward, and are discharged into the receiving port 5a of the distribution chute 5.

Therefore, even if the relative relationship between the direction in which the raw material is guided through the distribution chute 5 and the direction in which the raw material is introduced by the charging conveyor 4 changes as the distribution chute 5 rotates, the material is discharged from the distribution chute 5. The raw material at that point in time is charged into the upper hopper 2 from the distribution chute 5, regardless of the penetration force when it is charged from the charging conveyor 4.

As a result, the charging distribution of raw materials in the upper hopper 2 is made uniform in both the radial and circumferential directions of the upper hopper 2, and the lower hopper 3 following the upper hopper 2 and the furnace body 1 are Similarly, a uniform charging distribution is obtained.

In the collecting hopper 10 of the embodiment, the inclined inner surface itself was used as the guide surface 10c, but like the collecting hopper 16 in FIG. The guide surface 16a may also be formed.

Further, the gate is not limited to the gates 12 shown in the embodiment, but any gate that can adjust the opening size of the discharge port 10b of the collecting hopper 10 may be used.
It may have any configuration.

[Effects of the invention] As explained above, according to the furnace top charging equipment of the present invention, the raw material supplied from the charging conveyor collides with the guide surface formed on the inner surface of the collecting hopper, so that the raw material is The charging conveyor cancels out the penetrating force in the conveying direction, that is, the force of jumping out, and the raw material, which has been separated into fine particles and coarse particles, is mixed again and guided to the guide surface to the discharge port. leading to.

If the opening size of this discharge port is set to an appropriate size according to the type and amount of raw materials input using a gate, the flow rate of the raw materials falling from the discharge port will not be impaired. ,
It is discharged into the center of the receptacle of the distribution chute which is held in place.

Therefore, as the distribution chute rotates,
Even if the relative relationship between the guiding direction of the raw material in the distribution chute and the direction in which the raw material is introduced by the charging conveyor changes, the raw material at the time it is discharged from the distribution chute will be the same as when it was input from the charging conveyor. is fed into the top hopper from the distribution chute regardless of its penetrating force.

As a result, the charging distribution of raw materials in the furnace top hopper is uniform in both the radial and circumferential directions of the furnace top hopper, and it is also uniform in the blast furnace following the furnace top hopper. Charge distribution is obtained.

[Brief explanation of the drawing]

Figures 1 to 3 are views showing one embodiment of the present invention, in which Figure 1 is an enlarged side sectional view of the main parts, Figure 2 is a side view of the collecting hopper, and Figure 3 is the same. 4 is a side sectional view showing another example of a collecting hopper, and FIG. 5 is a side view showing conventional charging equipment. 2... Upper hopper (furnace top hopper), 4...
Charging conveyor, 5...Distribution chute, 10, 16
...Gathering hopper, 10b...Discharge port, 10c,
16a...Guide surface, 12.12...Gate.

Claims (1)

[Scope of utility model registration request] A distribution chute is provided below the charging conveyor at the top of the blast furnace to receive the raw materials carried by the charging conveyor, and a furnace top hopper is provided below the distribution chute to store the raw materials introduced from the distribution chute. In the furnace top charging equipment that supplies the raw material stored in the furnace top hopper into the furnace, the raw material conveyed by the charging conveyor is directly received and sent to the distribution chute between the charging conveyor and the distribution chute. A collecting hopper for discharging raw materials is arranged, and the inner surface of this collecting hopper has a guide surface on which the raw materials supplied from the charging conveyor collide and drop the raw materials through the discharge port toward the center of the raw material receiving port of the distribution chute. Furnace top charging equipment characterized in that a gate is provided at the discharge port of the collecting hopper to adjust the opening size of the discharge port.